xref: /freebsd/sys/netinet/tcp_lro.c (revision abba58766fdd7f9720761aba39c2b9653eb4fbd3)
127f190a3SBjoern A. Zeeb /*-
2fe267a55SPedro F. Giffuni  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3fe267a55SPedro F. Giffuni  *
427f190a3SBjoern A. Zeeb  * Copyright (c) 2007, Myricom Inc.
527f190a3SBjoern A. Zeeb  * Copyright (c) 2008, Intel Corporation.
662b5b6ecSBjoern A. Zeeb  * Copyright (c) 2012 The FreeBSD Foundation
79ca874cfSHans Petter Selasky  * Copyright (c) 2016-2021 Mellanox Technologies.
827f190a3SBjoern A. Zeeb  * All rights reserved.
927f190a3SBjoern A. Zeeb  *
1062b5b6ecSBjoern A. Zeeb  * Portions of this software were developed by Bjoern Zeeb
1162b5b6ecSBjoern A. Zeeb  * under sponsorship from the FreeBSD Foundation.
1262b5b6ecSBjoern A. Zeeb  *
1327f190a3SBjoern A. Zeeb  * Redistribution and use in source and binary forms, with or without
1427f190a3SBjoern A. Zeeb  * modification, are permitted provided that the following conditions
1527f190a3SBjoern A. Zeeb  * are met:
1627f190a3SBjoern A. Zeeb  * 1. Redistributions of source code must retain the above copyright
1727f190a3SBjoern A. Zeeb  *    notice, this list of conditions and the following disclaimer.
1827f190a3SBjoern A. Zeeb  * 2. Redistributions in binary form must reproduce the above copyright
1927f190a3SBjoern A. Zeeb  *    notice, this list of conditions and the following disclaimer in the
2027f190a3SBjoern A. Zeeb  *    documentation and/or other materials provided with the distribution.
2127f190a3SBjoern A. Zeeb  *
2227f190a3SBjoern A. Zeeb  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
2327f190a3SBjoern A. Zeeb  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2427f190a3SBjoern A. Zeeb  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2527f190a3SBjoern A. Zeeb  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
2627f190a3SBjoern A. Zeeb  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2727f190a3SBjoern A. Zeeb  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2827f190a3SBjoern A. Zeeb  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2927f190a3SBjoern A. Zeeb  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
3027f190a3SBjoern A. Zeeb  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
3127f190a3SBjoern A. Zeeb  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3227f190a3SBjoern A. Zeeb  * SUCH DAMAGE.
3327f190a3SBjoern A. Zeeb  */
346c5087a8SJack F Vogel 
3562b5b6ecSBjoern A. Zeeb #include <sys/cdefs.h>
3662b5b6ecSBjoern A. Zeeb __FBSDID("$FreeBSD$");
3762b5b6ecSBjoern A. Zeeb 
3862b5b6ecSBjoern A. Zeeb #include "opt_inet.h"
3962b5b6ecSBjoern A. Zeeb #include "opt_inet6.h"
4062b5b6ecSBjoern A. Zeeb 
416c5087a8SJack F Vogel #include <sys/param.h>
426c5087a8SJack F Vogel #include <sys/systm.h>
436c5087a8SJack F Vogel #include <sys/kernel.h>
448ec07310SGleb Smirnoff #include <sys/malloc.h>
458ec07310SGleb Smirnoff #include <sys/mbuf.h>
466c5087a8SJack F Vogel #include <sys/socket.h>
47e57b2d0eSRandall Stewart #include <sys/socketvar.h>
48e57b2d0eSRandall Stewart #include <sys/sockbuf.h>
498452c1b3SSepherosa Ziehau #include <sys/sysctl.h>
506c5087a8SJack F Vogel 
516c5087a8SJack F Vogel #include <net/if.h>
5262b5b6ecSBjoern A. Zeeb #include <net/if_var.h>
536c5087a8SJack F Vogel #include <net/ethernet.h>
5469a34e8dSRandall Stewart #include <net/bpf.h>
555fa2656eSBjoern A. Zeeb #include <net/vnet.h>
562c6ff1d6SAndrew Gallatin #include <net/if_dl.h>
572c6ff1d6SAndrew Gallatin #include <net/if_media.h>
583d0d5b21SJustin Hibbits #include <net/if_private.h>
592c6ff1d6SAndrew Gallatin #include <net/if_types.h>
602c6ff1d6SAndrew Gallatin #include <net/infiniband.h>
612c6ff1d6SAndrew Gallatin #include <net/if_lagg.h>
626c5087a8SJack F Vogel 
636c5087a8SJack F Vogel #include <netinet/in_systm.h>
646c5087a8SJack F Vogel #include <netinet/in.h>
6562b5b6ecSBjoern A. Zeeb #include <netinet/ip6.h>
666c5087a8SJack F Vogel #include <netinet/ip.h>
6731bfc56eSBjoern A. Zeeb #include <netinet/ip_var.h>
68e57b2d0eSRandall Stewart #include <netinet/in_pcb.h>
69e57b2d0eSRandall Stewart #include <netinet6/in6_pcb.h>
706c5087a8SJack F Vogel #include <netinet/tcp.h>
71d7fb35d1SSean Bruno #include <netinet/tcp_seq.h>
726c5087a8SJack F Vogel #include <netinet/tcp_lro.h>
738452c1b3SSepherosa Ziehau #include <netinet/tcp_var.h>
7469a34e8dSRandall Stewart #include <netinet/tcpip.h>
75e57b2d0eSRandall Stewart #include <netinet/tcp_hpts.h>
76e57b2d0eSRandall Stewart #include <netinet/tcp_log_buf.h>
7731bc602fSRandall Stewart #include <netinet/tcp_fsm.h>
789ca874cfSHans Petter Selasky #include <netinet/udp.h>
7931bfc56eSBjoern A. Zeeb #include <netinet6/ip6_var.h>
8031bfc56eSBjoern A. Zeeb 
816c5087a8SJack F Vogel #include <machine/in_cksum.h>
826c5087a8SJack F Vogel 
83e936121dSHans Petter Selasky static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures");
846c5087a8SJack F Vogel 
859ca874cfSHans Petter Selasky #define	TCP_LRO_TS_OPTION \
869ca874cfSHans Petter Selasky     ntohl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | \
879ca874cfSHans Petter Selasky 	  (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)
886c5087a8SJack F Vogel 
896dd38b87SSepherosa Ziehau static void	tcp_lro_rx_done(struct lro_ctrl *lc);
909ca874cfSHans Petter Selasky static int	tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m,
919ca874cfSHans Petter Selasky 		    uint32_t csum, bool use_hash);
929ca874cfSHans Petter Selasky 
939ca874cfSHans Petter Selasky #ifdef TCPHPTS
949ca874cfSHans Petter Selasky static bool	do_bpf_strip_and_compress(struct inpcb *, struct lro_ctrl *,
952c6ff1d6SAndrew Gallatin 		struct lro_entry *, struct mbuf **, struct mbuf **, struct mbuf **,
964e0ce82bSRandall Stewart  		bool *, bool, bool, struct ifnet *, bool);
979ca874cfSHans Petter Selasky 
989ca874cfSHans Petter Selasky #endif
996dd38b87SSepherosa Ziehau 
1008452c1b3SSepherosa Ziehau SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro,  CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1018452c1b3SSepherosa Ziehau     "TCP LRO");
1028452c1b3SSepherosa Ziehau 
1039ca874cfSHans Petter Selasky static long tcplro_stacks_wanting_mbufq;
104e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_direct_queue;
105e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_wokeup_queue;
106e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_compressed;
107e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_locks_taken;
10869a34e8dSRandall Stewart counter_u64_t tcp_extra_mbuf;
10969a34e8dSRandall Stewart counter_u64_t tcp_would_have_but;
11069a34e8dSRandall Stewart counter_u64_t tcp_comp_total;
11169a34e8dSRandall Stewart counter_u64_t tcp_uncomp_total;
112ca1a7e10SRandall Stewart counter_u64_t tcp_bad_csums;
113e57b2d0eSRandall Stewart 
1148452c1b3SSepherosa Ziehau static unsigned	tcp_lro_entries = TCP_LRO_ENTRIES;
1158452c1b3SSepherosa Ziehau SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries,
1168452c1b3SSepherosa Ziehau     CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_entries, 0,
1178452c1b3SSepherosa Ziehau     "default number of LRO entries");
11869a34e8dSRandall Stewart 
119d7955cc0SRandall Stewart static uint32_t tcp_lro_cpu_set_thresh = TCP_LRO_CPU_DECLARATION_THRESH;
120d7955cc0SRandall Stewart SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, lro_cpu_threshold,
121d7955cc0SRandall Stewart     CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_cpu_set_thresh, 0,
12208c7f1b6SNavdeep Parhar     "Number of interrupts in a row on the same CPU that will make us declare an 'affinity' cpu?");
123d7955cc0SRandall Stewart 
1244e0ce82bSRandall Stewart static uint32_t tcp_less_accurate_lro_ts = 0;
1254e0ce82bSRandall Stewart SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, lro_less_accurate,
1264e0ce82bSRandall Stewart     CTLFLAG_MPSAFE, &tcp_less_accurate_lro_ts, 0,
1274e0ce82bSRandall Stewart     "Do we trade off efficency by doing less timestamp operations for time accuracy?");
1284e0ce82bSRandall Stewart 
129e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, fullqueue, CTLFLAG_RD,
130e57b2d0eSRandall Stewart     &tcp_inp_lro_direct_queue, "Number of lro's fully queued to transport");
131e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, wokeup, CTLFLAG_RD,
132e57b2d0eSRandall Stewart     &tcp_inp_lro_wokeup_queue, "Number of lro's where we woke up transport via hpts");
133e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, compressed, CTLFLAG_RD,
134e57b2d0eSRandall Stewart     &tcp_inp_lro_compressed, "Number of lro's compressed and sent to transport");
135e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lockcnt, CTLFLAG_RD,
136e57b2d0eSRandall Stewart     &tcp_inp_lro_locks_taken, "Number of lro's inp_wlocks taken");
13769a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, extra_mbuf, CTLFLAG_RD,
13869a34e8dSRandall Stewart     &tcp_extra_mbuf, "Number of times we had an extra compressed ack dropped into the tp");
13969a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, would_have_but, CTLFLAG_RD,
1409ca874cfSHans Petter Selasky     &tcp_would_have_but, "Number of times we would have had an extra compressed, but mget failed");
14169a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, with_m_ackcmp, CTLFLAG_RD,
14269a34e8dSRandall Stewart     &tcp_comp_total, "Number of mbufs queued with M_ACKCMP flags set");
14369a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, without_m_ackcmp, CTLFLAG_RD,
14469a34e8dSRandall Stewart     &tcp_uncomp_total, "Number of mbufs queued without M_ACKCMP");
145ca1a7e10SRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lro_badcsum, CTLFLAG_RD,
146ca1a7e10SRandall Stewart     &tcp_bad_csums, "Number of packets that the common code saw with bad csums");
147e57b2d0eSRandall Stewart 
148e57b2d0eSRandall Stewart void
149e57b2d0eSRandall Stewart tcp_lro_reg_mbufq(void)
150e57b2d0eSRandall Stewart {
151e57b2d0eSRandall Stewart 	atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, 1);
152e57b2d0eSRandall Stewart }
153e57b2d0eSRandall Stewart 
154e57b2d0eSRandall Stewart void
155e57b2d0eSRandall Stewart tcp_lro_dereg_mbufq(void)
156e57b2d0eSRandall Stewart {
157e57b2d0eSRandall Stewart 	atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, -1);
158e57b2d0eSRandall Stewart }
1598452c1b3SSepherosa Ziehau 
16051e3c20dSSepherosa Ziehau static __inline void
16105cde7efSSepherosa Ziehau tcp_lro_active_insert(struct lro_ctrl *lc, struct lro_head *bucket,
16205cde7efSSepherosa Ziehau     struct lro_entry *le)
16351e3c20dSSepherosa Ziehau {
16451e3c20dSSepherosa Ziehau 
16551e3c20dSSepherosa Ziehau 	LIST_INSERT_HEAD(&lc->lro_active, le, next);
16605cde7efSSepherosa Ziehau 	LIST_INSERT_HEAD(bucket, le, hash_next);
16751e3c20dSSepherosa Ziehau }
16851e3c20dSSepherosa Ziehau 
16951e3c20dSSepherosa Ziehau static __inline void
17051e3c20dSSepherosa Ziehau tcp_lro_active_remove(struct lro_entry *le)
17151e3c20dSSepherosa Ziehau {
17251e3c20dSSepherosa Ziehau 
17305cde7efSSepherosa Ziehau 	LIST_REMOVE(le, next);		/* active list */
17405cde7efSSepherosa Ziehau 	LIST_REMOVE(le, hash_next);	/* hash bucket */
17551e3c20dSSepherosa Ziehau }
17651e3c20dSSepherosa Ziehau 
1776c5087a8SJack F Vogel int
17862b5b6ecSBjoern A. Zeeb tcp_lro_init(struct lro_ctrl *lc)
1796c5087a8SJack F Vogel {
1808452c1b3SSepherosa Ziehau 	return (tcp_lro_init_args(lc, NULL, tcp_lro_entries, 0));
181e936121dSHans Petter Selasky }
182e936121dSHans Petter Selasky 
183e936121dSHans Petter Selasky int
184e936121dSHans Petter Selasky tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp,
185e936121dSHans Petter Selasky     unsigned lro_entries, unsigned lro_mbufs)
186e936121dSHans Petter Selasky {
18762b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
188e936121dSHans Petter Selasky 	size_t size;
18905cde7efSSepherosa Ziehau 	unsigned i, elements;
1906c5087a8SJack F Vogel 
19162b5b6ecSBjoern A. Zeeb 	lc->lro_bad_csum = 0;
19262b5b6ecSBjoern A. Zeeb 	lc->lro_queued = 0;
19362b5b6ecSBjoern A. Zeeb 	lc->lro_flushed = 0;
194e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
195e936121dSHans Petter Selasky 	lc->lro_mbuf_max = lro_mbufs;
196e936121dSHans Petter Selasky 	lc->lro_cnt = lro_entries;
1977ae3d4bfSSepherosa Ziehau 	lc->lro_ackcnt_lim = TCP_LRO_ACKCNT_MAX;
1987ae3d4bfSSepherosa Ziehau 	lc->lro_length_lim = TCP_LRO_LENGTH_MAX;
199e936121dSHans Petter Selasky 	lc->ifp = ifp;
2001ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_free);
2011ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_active);
2026c5087a8SJack F Vogel 
20305cde7efSSepherosa Ziehau 	/* create hash table to accelerate entry lookup */
20405cde7efSSepherosa Ziehau 	if (lro_entries > lro_mbufs)
20505cde7efSSepherosa Ziehau 		elements = lro_entries;
20605cde7efSSepherosa Ziehau 	else
20705cde7efSSepherosa Ziehau 		elements = lro_mbufs;
20805cde7efSSepherosa Ziehau 	lc->lro_hash = phashinit_flags(elements, M_LRO, &lc->lro_hashsz,
20905cde7efSSepherosa Ziehau 	    HASH_NOWAIT);
21005cde7efSSepherosa Ziehau 	if (lc->lro_hash == NULL) {
21105cde7efSSepherosa Ziehau 		memset(lc, 0, sizeof(*lc));
21205cde7efSSepherosa Ziehau 		return (ENOMEM);
21305cde7efSSepherosa Ziehau 	}
21405cde7efSSepherosa Ziehau 
215e936121dSHans Petter Selasky 	/* compute size to allocate */
216fc271df3SHans Petter Selasky 	size = (lro_mbufs * sizeof(struct lro_mbuf_sort)) +
217e936121dSHans Petter Selasky 	    (lro_entries * sizeof(*le));
218fc271df3SHans Petter Selasky 	lc->lro_mbuf_data = (struct lro_mbuf_sort *)
219e936121dSHans Petter Selasky 	    malloc(size, M_LRO, M_NOWAIT | M_ZERO);
2206c5087a8SJack F Vogel 
221e936121dSHans Petter Selasky 	/* check for out of memory */
222e936121dSHans Petter Selasky 	if (lc->lro_mbuf_data == NULL) {
223a3927369SNavdeep Parhar 		free(lc->lro_hash, M_LRO);
224e936121dSHans Petter Selasky 		memset(lc, 0, sizeof(*lc));
225e936121dSHans Petter Selasky 		return (ENOMEM);
226e936121dSHans Petter Selasky 	}
227e936121dSHans Petter Selasky 	/* compute offset for LRO entries */
228e936121dSHans Petter Selasky 	le = (struct lro_entry *)
229e936121dSHans Petter Selasky 	    (lc->lro_mbuf_data + lro_mbufs);
230e936121dSHans Petter Selasky 
231e936121dSHans Petter Selasky 	/* setup linked list */
232e936121dSHans Petter Selasky 	for (i = 0; i != lro_entries; i++)
2331ea44822SSepherosa Ziehau 		LIST_INSERT_HEAD(&lc->lro_free, le + i, next);
234e936121dSHans Petter Selasky 
235e936121dSHans Petter Selasky 	return (0);
2366c5087a8SJack F Vogel }
2376c5087a8SJack F Vogel 
2389ca874cfSHans Petter Selasky struct vxlan_header {
2399ca874cfSHans Petter Selasky 	uint32_t	vxlh_flags;
2409ca874cfSHans Petter Selasky 	uint32_t	vxlh_vni;
2419ca874cfSHans Petter Selasky };
242e57b2d0eSRandall Stewart 
2439ca874cfSHans Petter Selasky static inline void *
2441d171e5aSRandall Stewart tcp_lro_low_level_parser(void *ptr, struct lro_parser *parser, bool update_data, bool is_vxlan, int mlen)
2459ca874cfSHans Petter Selasky {
2469ca874cfSHans Petter Selasky 	const struct ether_vlan_header *eh;
2479ca874cfSHans Petter Selasky 	void *old;
2489ca874cfSHans Petter Selasky 	uint16_t eth_type;
2499ca874cfSHans Petter Selasky 
2509ca874cfSHans Petter Selasky 	if (update_data)
2519ca874cfSHans Petter Selasky 		memset(parser, 0, sizeof(*parser));
2529ca874cfSHans Petter Selasky 
2539ca874cfSHans Petter Selasky 	old = ptr;
2549ca874cfSHans Petter Selasky 
2559ca874cfSHans Petter Selasky 	if (is_vxlan) {
2569ca874cfSHans Petter Selasky 		const struct vxlan_header *vxh;
2579ca874cfSHans Petter Selasky 		vxh = ptr;
2589ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + sizeof(*vxh);
2599ca874cfSHans Petter Selasky 		if (update_data) {
2609ca874cfSHans Petter Selasky 			parser->data.vxlan_vni =
2619ca874cfSHans Petter Selasky 			    vxh->vxlh_vni & htonl(0xffffff00);
262e57b2d0eSRandall Stewart 		}
2639ca874cfSHans Petter Selasky 	}
2649ca874cfSHans Petter Selasky 
2659ca874cfSHans Petter Selasky 	eh = ptr;
2669ca874cfSHans Petter Selasky 	if (__predict_false(eh->evl_encap_proto == htons(ETHERTYPE_VLAN))) {
2679ca874cfSHans Petter Selasky 		eth_type = eh->evl_proto;
2689ca874cfSHans Petter Selasky 		if (update_data) {
2699ca874cfSHans Petter Selasky 			/* strip priority and keep VLAN ID only */
2709ca874cfSHans Petter Selasky 			parser->data.vlan_id = eh->evl_tag & htons(EVL_VLID_MASK);
2719ca874cfSHans Petter Selasky 		}
2729ca874cfSHans Petter Selasky 		/* advance to next header */
2739ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
2741d171e5aSRandall Stewart 		mlen -= (ETHER_HDR_LEN  + ETHER_VLAN_ENCAP_LEN);
2759ca874cfSHans Petter Selasky 	} else {
2769ca874cfSHans Petter Selasky 		eth_type = eh->evl_encap_proto;
2779ca874cfSHans Petter Selasky 		/* advance to next header */
2781d171e5aSRandall Stewart 		mlen -= ETHER_HDR_LEN;
2799ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + ETHER_HDR_LEN;
2809ca874cfSHans Petter Selasky 	}
2811d171e5aSRandall Stewart 	if (__predict_false(mlen <= 0))
2821d171e5aSRandall Stewart 		return (NULL);
2839ca874cfSHans Petter Selasky 	switch (eth_type) {
2849ca874cfSHans Petter Selasky #ifdef INET
2859ca874cfSHans Petter Selasky 	case htons(ETHERTYPE_IP):
2869ca874cfSHans Petter Selasky 		parser->ip4 = ptr;
2871d171e5aSRandall Stewart 		if (__predict_false(mlen < sizeof(struct ip)))
2881d171e5aSRandall Stewart 			return (NULL);
2899ca874cfSHans Petter Selasky 		/* Ensure there are no IPv4 options. */
2909ca874cfSHans Petter Selasky 		if ((parser->ip4->ip_hl << 2) != sizeof (*parser->ip4))
2919ca874cfSHans Petter Selasky 			break;
2929ca874cfSHans Petter Selasky 		/* .. and the packet is not fragmented. */
2939ca874cfSHans Petter Selasky 		if (parser->ip4->ip_off & htons(IP_MF|IP_OFFMASK))
2949ca874cfSHans Petter Selasky 			break;
295*abba5876SAndrew Gallatin 		/* .. and the packet has valid src/dst addrs */
296*abba5876SAndrew Gallatin 		if (__predict_false(parser->ip4->ip_src.s_addr == INADDR_ANY ||
297*abba5876SAndrew Gallatin 			parser->ip4->ip_dst.s_addr == INADDR_ANY))
298*abba5876SAndrew Gallatin 			break;
2999ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + (parser->ip4->ip_hl << 2);
3001d171e5aSRandall Stewart 		mlen -= sizeof(struct ip);
3019ca874cfSHans Petter Selasky 		if (update_data) {
3029ca874cfSHans Petter Selasky 			parser->data.s_addr.v4 = parser->ip4->ip_src;
3039ca874cfSHans Petter Selasky 			parser->data.d_addr.v4 = parser->ip4->ip_dst;
3049ca874cfSHans Petter Selasky 		}
3059ca874cfSHans Petter Selasky 		switch (parser->ip4->ip_p) {
3069ca874cfSHans Petter Selasky 		case IPPROTO_UDP:
3071d171e5aSRandall Stewart 			if (__predict_false(mlen < sizeof(struct udphdr)))
3081d171e5aSRandall Stewart 				return (NULL);
3099ca874cfSHans Petter Selasky 			parser->udp = ptr;
3109ca874cfSHans Petter Selasky 			if (update_data) {
3119ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV4_UDP;
3129ca874cfSHans Petter Selasky 				parser->data.s_port = parser->udp->uh_sport;
3139ca874cfSHans Petter Selasky 				parser->data.d_port = parser->udp->uh_dport;
3149ca874cfSHans Petter Selasky 			} else {
3159ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV4_UDP);
3169ca874cfSHans Petter Selasky 			}
3179ca874cfSHans Petter Selasky 			ptr = ((uint8_t *)ptr + sizeof(*parser->udp));
3189ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3199ca874cfSHans Petter Selasky 			return (ptr);
3209ca874cfSHans Petter Selasky 		case IPPROTO_TCP:
3219ca874cfSHans Petter Selasky 			parser->tcp = ptr;
3221d171e5aSRandall Stewart 			if (__predict_false(mlen < sizeof(struct tcphdr)))
3231d171e5aSRandall Stewart 				return (NULL);
3249ca874cfSHans Petter Selasky 			if (update_data) {
3259ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV4_TCP;
3269ca874cfSHans Petter Selasky 				parser->data.s_port = parser->tcp->th_sport;
3279ca874cfSHans Petter Selasky 				parser->data.d_port = parser->tcp->th_dport;
3289ca874cfSHans Petter Selasky 			} else {
3299ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV4_TCP);
3309ca874cfSHans Petter Selasky 			}
3311d171e5aSRandall Stewart 			if (__predict_false(mlen < (parser->tcp->th_off << 2)))
3321d171e5aSRandall Stewart 				return (NULL);
3339ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2);
3349ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3359ca874cfSHans Petter Selasky 			return (ptr);
3369ca874cfSHans Petter Selasky 		default:
3379ca874cfSHans Petter Selasky 			break;
3389ca874cfSHans Petter Selasky 		}
3399ca874cfSHans Petter Selasky 		break;
3409ca874cfSHans Petter Selasky #endif
3419ca874cfSHans Petter Selasky #ifdef INET6
3429ca874cfSHans Petter Selasky 	case htons(ETHERTYPE_IPV6):
3439ca874cfSHans Petter Selasky 		parser->ip6 = ptr;
3441d171e5aSRandall Stewart 		if (__predict_false(mlen < sizeof(struct ip6_hdr)))
3451d171e5aSRandall Stewart 			return (NULL);
346*abba5876SAndrew Gallatin 		/* Ensure the packet has valid src/dst addrs */
347*abba5876SAndrew Gallatin 		if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&parser->ip6->ip6_src) ||
348*abba5876SAndrew Gallatin 			IN6_IS_ADDR_UNSPECIFIED(&parser->ip6->ip6_dst)))
349*abba5876SAndrew Gallatin 			return (NULL);
3509ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + sizeof(*parser->ip6);
3519ca874cfSHans Petter Selasky 		if (update_data) {
3529ca874cfSHans Petter Selasky 			parser->data.s_addr.v6 = parser->ip6->ip6_src;
3539ca874cfSHans Petter Selasky 			parser->data.d_addr.v6 = parser->ip6->ip6_dst;
3549ca874cfSHans Petter Selasky 		}
3551d171e5aSRandall Stewart 		mlen -= sizeof(struct ip6_hdr);
3569ca874cfSHans Petter Selasky 		switch (parser->ip6->ip6_nxt) {
3579ca874cfSHans Petter Selasky 		case IPPROTO_UDP:
3581d171e5aSRandall Stewart 			if (__predict_false(mlen < sizeof(struct udphdr)))
3591d171e5aSRandall Stewart 				return (NULL);
3609ca874cfSHans Petter Selasky 			parser->udp = ptr;
3619ca874cfSHans Petter Selasky 			if (update_data) {
3629ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV6_UDP;
3639ca874cfSHans Petter Selasky 				parser->data.s_port = parser->udp->uh_sport;
3649ca874cfSHans Petter Selasky 				parser->data.d_port = parser->udp->uh_dport;
3659ca874cfSHans Petter Selasky 			} else {
3669ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV6_UDP);
3679ca874cfSHans Petter Selasky 			}
3689ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + sizeof(*parser->udp);
3699ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3709ca874cfSHans Petter Selasky 			return (ptr);
3719ca874cfSHans Petter Selasky 		case IPPROTO_TCP:
3721d171e5aSRandall Stewart 			if (__predict_false(mlen < sizeof(struct tcphdr)))
3731d171e5aSRandall Stewart 				return (NULL);
3749ca874cfSHans Petter Selasky 			parser->tcp = ptr;
3759ca874cfSHans Petter Selasky 			if (update_data) {
3769ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV6_TCP;
3779ca874cfSHans Petter Selasky 				parser->data.s_port = parser->tcp->th_sport;
3789ca874cfSHans Petter Selasky 				parser->data.d_port = parser->tcp->th_dport;
3799ca874cfSHans Petter Selasky 			} else {
3809ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV6_TCP);
3819ca874cfSHans Petter Selasky 			}
3821d171e5aSRandall Stewart 			if (__predict_false(mlen < (parser->tcp->th_off << 2)))
3831d171e5aSRandall Stewart 				return (NULL);
3849ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2);
3859ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3869ca874cfSHans Petter Selasky 			return (ptr);
3879ca874cfSHans Petter Selasky 		default:
3889ca874cfSHans Petter Selasky 			break;
3899ca874cfSHans Petter Selasky 		}
3909ca874cfSHans Petter Selasky 		break;
3919ca874cfSHans Petter Selasky #endif
3929ca874cfSHans Petter Selasky 	default:
3939ca874cfSHans Petter Selasky 		break;
3949ca874cfSHans Petter Selasky 	}
3959ca874cfSHans Petter Selasky 	/* Invalid packet - cannot parse */
3969ca874cfSHans Petter Selasky 	return (NULL);
3979ca874cfSHans Petter Selasky }
3989ca874cfSHans Petter Selasky 
3999ca874cfSHans Petter Selasky static const int vxlan_csum = CSUM_INNER_L3_CALC | CSUM_INNER_L3_VALID |
4009ca874cfSHans Petter Selasky     CSUM_INNER_L4_CALC | CSUM_INNER_L4_VALID;
4019ca874cfSHans Petter Selasky 
4029ca874cfSHans Petter Selasky static inline struct lro_parser *
4039ca874cfSHans Petter Selasky tcp_lro_parser(struct mbuf *m, struct lro_parser *po, struct lro_parser *pi, bool update_data)
4049ca874cfSHans Petter Selasky {
4059ca874cfSHans Petter Selasky 	void *data_ptr;
4069ca874cfSHans Petter Selasky 
4079ca874cfSHans Petter Selasky 	/* Try to parse outer headers first. */
4081d171e5aSRandall Stewart 	data_ptr = tcp_lro_low_level_parser(m->m_data, po, update_data, false, m->m_len);
4099ca874cfSHans Petter Selasky 	if (data_ptr == NULL || po->total_hdr_len > m->m_len)
4109ca874cfSHans Petter Selasky 		return (NULL);
4119ca874cfSHans Petter Selasky 
4129ca874cfSHans Petter Selasky 	if (update_data) {
4139ca874cfSHans Petter Selasky 		/* Store VLAN ID, if any. */
4149ca874cfSHans Petter Selasky 		if (__predict_false(m->m_flags & M_VLANTAG)) {
4159ca874cfSHans Petter Selasky 			po->data.vlan_id =
4169ca874cfSHans Petter Selasky 			    htons(m->m_pkthdr.ether_vtag) & htons(EVL_VLID_MASK);
4179ca874cfSHans Petter Selasky 		}
418bb5cd80eSHans Petter Selasky 		/* Store decrypted flag, if any. */
41910a62eb1SHans Petter Selasky 		if (__predict_false((m->m_pkthdr.csum_flags &
42010a62eb1SHans Petter Selasky 		    CSUM_TLS_MASK) == CSUM_TLS_DECRYPTED))
421bb5cd80eSHans Petter Selasky 			po->data.lro_flags |= LRO_FLAG_DECRYPTED;
4229ca874cfSHans Petter Selasky 	}
4239ca874cfSHans Petter Selasky 
4249ca874cfSHans Petter Selasky 	switch (po->data.lro_type) {
4259ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_UDP:
4269ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_UDP:
4279ca874cfSHans Petter Selasky 		/* Check for VXLAN headers. */
4289ca874cfSHans Petter Selasky 		if ((m->m_pkthdr.csum_flags & vxlan_csum) != vxlan_csum)
4299ca874cfSHans Petter Selasky 			break;
4309ca874cfSHans Petter Selasky 
4319ca874cfSHans Petter Selasky 		/* Try to parse inner headers. */
4321d171e5aSRandall Stewart 		data_ptr = tcp_lro_low_level_parser(data_ptr, pi, update_data, true,
4331d171e5aSRandall Stewart 						    (m->m_len - ((caddr_t)data_ptr - m->m_data)));
4341d171e5aSRandall Stewart 		if (data_ptr == NULL || (pi->total_hdr_len + po->total_hdr_len) > m->m_len)
4359ca874cfSHans Petter Selasky 			break;
4369ca874cfSHans Petter Selasky 
4379ca874cfSHans Petter Selasky 		/* Verify supported header types. */
4389ca874cfSHans Petter Selasky 		switch (pi->data.lro_type) {
4399ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
4409ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
4419ca874cfSHans Petter Selasky 			return (pi);
4429ca874cfSHans Petter Selasky 		default:
4439ca874cfSHans Petter Selasky 			break;
4449ca874cfSHans Petter Selasky 		}
4459ca874cfSHans Petter Selasky 		break;
4469ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
4479ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
4489ca874cfSHans Petter Selasky 		if (update_data)
4499ca874cfSHans Petter Selasky 			memset(pi, 0, sizeof(*pi));
4509ca874cfSHans Petter Selasky 		return (po);
4519ca874cfSHans Petter Selasky 	default:
4529ca874cfSHans Petter Selasky 		break;
4539ca874cfSHans Petter Selasky 	}
4549ca874cfSHans Petter Selasky 	return (NULL);
4559ca874cfSHans Petter Selasky }
4569ca874cfSHans Petter Selasky 
4579ca874cfSHans Petter Selasky static inline int
4589ca874cfSHans Petter Selasky tcp_lro_trim_mbuf_chain(struct mbuf *m, const struct lro_parser *po)
4599ca874cfSHans Petter Selasky {
4609ca874cfSHans Petter Selasky 	int len;
4619ca874cfSHans Petter Selasky 
4629ca874cfSHans Petter Selasky 	switch (po->data.lro_type) {
4639ca874cfSHans Petter Selasky #ifdef INET
4649ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
4659ca874cfSHans Petter Selasky 		len = ((uint8_t *)po->ip4 - (uint8_t *)m->m_data) +
4669ca874cfSHans Petter Selasky 		    ntohs(po->ip4->ip_len);
4679ca874cfSHans Petter Selasky 		break;
4689ca874cfSHans Petter Selasky #endif
4699ca874cfSHans Petter Selasky #ifdef INET6
4709ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
4719ca874cfSHans Petter Selasky 		len = ((uint8_t *)po->ip6 - (uint8_t *)m->m_data) +
4729ca874cfSHans Petter Selasky 		    ntohs(po->ip6->ip6_plen) + sizeof(*po->ip6);
4739ca874cfSHans Petter Selasky 		break;
4749ca874cfSHans Petter Selasky #endif
4759ca874cfSHans Petter Selasky 	default:
4769ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
4779ca874cfSHans Petter Selasky 	}
4789ca874cfSHans Petter Selasky 
4799ca874cfSHans Petter Selasky 	/*
4809ca874cfSHans Petter Selasky 	 * If the frame is padded beyond the end of the IP packet,
4819ca874cfSHans Petter Selasky 	 * then trim the extra bytes off:
4829ca874cfSHans Petter Selasky 	 */
4839ca874cfSHans Petter Selasky 	if (__predict_true(m->m_pkthdr.len == len)) {
4849ca874cfSHans Petter Selasky 		return (0);
4859ca874cfSHans Petter Selasky 	} else if (m->m_pkthdr.len > len) {
4869ca874cfSHans Petter Selasky 		m_adj(m, len - m->m_pkthdr.len);
4879ca874cfSHans Petter Selasky 		return (0);
4889ca874cfSHans Petter Selasky 	}
4899ca874cfSHans Petter Selasky 	return (TCP_LRO_CANNOT);
4909ca874cfSHans Petter Selasky }
4919ca874cfSHans Petter Selasky 
4929ca874cfSHans Petter Selasky static struct tcphdr *
4939ca874cfSHans Petter Selasky tcp_lro_get_th(struct mbuf *m)
4949ca874cfSHans Petter Selasky {
4959ca874cfSHans Petter Selasky 	return ((struct tcphdr *)((uint8_t *)m->m_data + m->m_pkthdr.lro_tcp_h_off));
496e57b2d0eSRandall Stewart }
497e57b2d0eSRandall Stewart 
49869a34e8dSRandall Stewart static void
49969a34e8dSRandall Stewart lro_free_mbuf_chain(struct mbuf *m)
50069a34e8dSRandall Stewart {
50169a34e8dSRandall Stewart 	struct mbuf *save;
50269a34e8dSRandall Stewart 
50369a34e8dSRandall Stewart 	while (m) {
50469a34e8dSRandall Stewart 		save = m->m_nextpkt;
50569a34e8dSRandall Stewart 		m->m_nextpkt = NULL;
50669a34e8dSRandall Stewart 		m_freem(m);
50769a34e8dSRandall Stewart 		m = save;
50869a34e8dSRandall Stewart 	}
50969a34e8dSRandall Stewart }
51069a34e8dSRandall Stewart 
5116c5087a8SJack F Vogel void
51262b5b6ecSBjoern A. Zeeb tcp_lro_free(struct lro_ctrl *lc)
5136c5087a8SJack F Vogel {
51462b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
515e936121dSHans Petter Selasky 	unsigned x;
5166c5087a8SJack F Vogel 
517e936121dSHans Petter Selasky 	/* reset LRO free list */
5181ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_free);
519e936121dSHans Petter Selasky 
520e936121dSHans Petter Selasky 	/* free active mbufs, if any */
5211ea44822SSepherosa Ziehau 	while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {
52251e3c20dSSepherosa Ziehau 		tcp_lro_active_remove(le);
52369a34e8dSRandall Stewart 		lro_free_mbuf_chain(le->m_head);
5246c5087a8SJack F Vogel 	}
525e936121dSHans Petter Selasky 
52605cde7efSSepherosa Ziehau 	/* free hash table */
52705cde7efSSepherosa Ziehau 	free(lc->lro_hash, M_LRO);
52805cde7efSSepherosa Ziehau 	lc->lro_hash = NULL;
52905cde7efSSepherosa Ziehau 	lc->lro_hashsz = 0;
53005cde7efSSepherosa Ziehau 
531e936121dSHans Petter Selasky 	/* free mbuf array, if any */
532e936121dSHans Petter Selasky 	for (x = 0; x != lc->lro_mbuf_count; x++)
533fc271df3SHans Petter Selasky 		m_freem(lc->lro_mbuf_data[x].mb);
534e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
535e936121dSHans Petter Selasky 
536e936121dSHans Petter Selasky 	/* free allocated memory, if any */
537e936121dSHans Petter Selasky 	free(lc->lro_mbuf_data, M_LRO);
538e936121dSHans Petter Selasky 	lc->lro_mbuf_data = NULL;
5396c5087a8SJack F Vogel }
5406c5087a8SJack F Vogel 
54162b5b6ecSBjoern A. Zeeb static uint16_t
5429ca874cfSHans Petter Selasky tcp_lro_rx_csum_tcphdr(const struct tcphdr *th)
54362b5b6ecSBjoern A. Zeeb {
5449ca874cfSHans Petter Selasky 	const uint16_t *ptr;
5459ca874cfSHans Petter Selasky 	uint32_t csum;
5469ca874cfSHans Petter Selasky 	uint16_t len;
54762b5b6ecSBjoern A. Zeeb 
5489ca874cfSHans Petter Selasky 	csum = -th->th_sum;	/* exclude checksum field */
5499ca874cfSHans Petter Selasky 	len = th->th_off;
5509ca874cfSHans Petter Selasky 	ptr = (const uint16_t *)th;
5519ca874cfSHans Petter Selasky 	while (len--) {
5529ca874cfSHans Petter Selasky 		csum += *ptr;
5539ca874cfSHans Petter Selasky 		ptr++;
5549ca874cfSHans Petter Selasky 		csum += *ptr;
5559ca874cfSHans Petter Selasky 		ptr++;
55662b5b6ecSBjoern A. Zeeb 	}
5579ca874cfSHans Petter Selasky 	while (csum > 0xffff)
5589ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
55962b5b6ecSBjoern A. Zeeb 
5609ca874cfSHans Petter Selasky 	return (csum);
56162b5b6ecSBjoern A. Zeeb }
56262b5b6ecSBjoern A. Zeeb 
56362b5b6ecSBjoern A. Zeeb static uint16_t
5649ca874cfSHans Petter Selasky tcp_lro_rx_csum_data(const struct lro_parser *pa, uint16_t tcp_csum)
56562b5b6ecSBjoern A. Zeeb {
56662b5b6ecSBjoern A. Zeeb 	uint32_t c;
56762b5b6ecSBjoern A. Zeeb 	uint16_t cs;
56862b5b6ecSBjoern A. Zeeb 
5699ca874cfSHans Petter Selasky 	c = tcp_csum;
57062b5b6ecSBjoern A. Zeeb 
5719ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
57262b5b6ecSBjoern A. Zeeb #ifdef INET6
5739ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
5749ca874cfSHans Petter Selasky 		/* Compute full pseudo IPv6 header checksum. */
5759ca874cfSHans Petter Selasky 		cs = in6_cksum_pseudo(pa->ip6, ntohs(pa->ip6->ip6_plen), pa->ip6->ip6_nxt, 0);
57662b5b6ecSBjoern A. Zeeb 		break;
57762b5b6ecSBjoern A. Zeeb #endif
57862b5b6ecSBjoern A. Zeeb #ifdef INET
5799ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
5809ca874cfSHans Petter Selasky 		/* Compute full pseudo IPv4 header checsum. */
5819ca874cfSHans Petter Selasky 		cs = in_addword(ntohs(pa->ip4->ip_len) - sizeof(*pa->ip4), IPPROTO_TCP);
5829ca874cfSHans Petter Selasky 		cs = in_pseudo(pa->ip4->ip_src.s_addr, pa->ip4->ip_dst.s_addr, htons(cs));
58362b5b6ecSBjoern A. Zeeb 		break;
58462b5b6ecSBjoern A. Zeeb #endif
58562b5b6ecSBjoern A. Zeeb 	default:
58662b5b6ecSBjoern A. Zeeb 		cs = 0;		/* Keep compiler happy. */
5879ca874cfSHans Petter Selasky 		break;
58862b5b6ecSBjoern A. Zeeb 	}
58962b5b6ecSBjoern A. Zeeb 
5909ca874cfSHans Petter Selasky 	/* Complement checksum. */
59162b5b6ecSBjoern A. Zeeb 	cs = ~cs;
59262b5b6ecSBjoern A. Zeeb 	c += cs;
59362b5b6ecSBjoern A. Zeeb 
5949ca874cfSHans Petter Selasky 	/* Remove TCP header checksum. */
5959ca874cfSHans Petter Selasky 	cs = ~tcp_lro_rx_csum_tcphdr(pa->tcp);
59662b5b6ecSBjoern A. Zeeb 	c += cs;
5979ca874cfSHans Petter Selasky 
5989ca874cfSHans Petter Selasky 	/* Compute checksum remainder. */
59962b5b6ecSBjoern A. Zeeb 	while (c > 0xffff)
60062b5b6ecSBjoern A. Zeeb 		c = (c >> 16) + (c & 0xffff);
60162b5b6ecSBjoern A. Zeeb 
6029ca874cfSHans Petter Selasky 	return (c);
60362b5b6ecSBjoern A. Zeeb }
60462b5b6ecSBjoern A. Zeeb 
6056dd38b87SSepherosa Ziehau static void
6066dd38b87SSepherosa Ziehau tcp_lro_rx_done(struct lro_ctrl *lc)
6076dd38b87SSepherosa Ziehau {
6086dd38b87SSepherosa Ziehau 	struct lro_entry *le;
6096dd38b87SSepherosa Ziehau 
6101ea44822SSepherosa Ziehau 	while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {
61151e3c20dSSepherosa Ziehau 		tcp_lro_active_remove(le);
6126dd38b87SSepherosa Ziehau 		tcp_lro_flush(lc, le);
6136dd38b87SSepherosa Ziehau 	}
6146dd38b87SSepherosa Ziehau }
6156dd38b87SSepherosa Ziehau 
6164e0ce82bSRandall Stewart static void
6174e0ce82bSRandall Stewart tcp_lro_flush_active(struct lro_ctrl *lc)
6184e0ce82bSRandall Stewart {
6194e0ce82bSRandall Stewart 	struct lro_entry *le;
6204e0ce82bSRandall Stewart 
6214e0ce82bSRandall Stewart 	/*
6224e0ce82bSRandall Stewart 	 * Walk through the list of le entries, and
6234e0ce82bSRandall Stewart 	 * any one that does have packets flush. This
6244e0ce82bSRandall Stewart 	 * is called because we have an inbound packet
6254e0ce82bSRandall Stewart 	 * (e.g. SYN) that has to have all others flushed
6264e0ce82bSRandall Stewart 	 * in front of it. Note we have to do the remove
6274e0ce82bSRandall Stewart 	 * because tcp_lro_flush() assumes that the entry
6284e0ce82bSRandall Stewart 	 * is being freed. This is ok it will just get
6294e0ce82bSRandall Stewart 	 * reallocated again like it was new.
6304e0ce82bSRandall Stewart 	 */
6314e0ce82bSRandall Stewart 	LIST_FOREACH(le, &lc->lro_active, next) {
6324e0ce82bSRandall Stewart 		if (le->m_head != NULL) {
6334e0ce82bSRandall Stewart 			tcp_lro_active_remove(le);
6344e0ce82bSRandall Stewart 			tcp_lro_flush(lc, le);
6354e0ce82bSRandall Stewart 		}
6364e0ce82bSRandall Stewart 	}
6374e0ce82bSRandall Stewart }
6384e0ce82bSRandall Stewart 
6396c5087a8SJack F Vogel void
6407127e6acSNavdeep Parhar tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout)
6417127e6acSNavdeep Parhar {
6427127e6acSNavdeep Parhar 	struct lro_entry *le, *le_tmp;
643b45daaeaSRandall Stewart 	uint64_t now, tov;
644b45daaeaSRandall Stewart 	struct bintime bt;
6457127e6acSNavdeep Parhar 
646dc6ab77dSMichael Tuexen 	NET_EPOCH_ASSERT();
6471ea44822SSepherosa Ziehau 	if (LIST_EMPTY(&lc->lro_active))
6487127e6acSNavdeep Parhar 		return;
6497127e6acSNavdeep Parhar 
650b45daaeaSRandall Stewart 	/* get timeout time and current time in ns */
651b45daaeaSRandall Stewart 	binuptime(&bt);
652b45daaeaSRandall Stewart 	now = bintime2ns(&bt);
653b45daaeaSRandall Stewart 	tov = ((timeout->tv_sec * 1000000000) + (timeout->tv_usec * 1000));
6541ea44822SSepherosa Ziehau 	LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) {
655b45daaeaSRandall Stewart 		if (now >= (bintime2ns(&le->alloc_time) + tov)) {
65651e3c20dSSepherosa Ziehau 			tcp_lro_active_remove(le);
6577127e6acSNavdeep Parhar 			tcp_lro_flush(lc, le);
6587127e6acSNavdeep Parhar 		}
6597127e6acSNavdeep Parhar 	}
6607127e6acSNavdeep Parhar }
6617127e6acSNavdeep Parhar 
662e57b2d0eSRandall Stewart #ifdef INET
663e57b2d0eSRandall Stewart static int
6649ca874cfSHans Petter Selasky tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4)
665e57b2d0eSRandall Stewart {
666e57b2d0eSRandall Stewart 	uint16_t csum;
667e57b2d0eSRandall Stewart 
668e57b2d0eSRandall Stewart 	/* Legacy IP has a header checksum that needs to be correct. */
6699ca874cfSHans Petter Selasky 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
6709ca874cfSHans Petter Selasky 		if (__predict_false((m->m_pkthdr.csum_flags & CSUM_IP_VALID) == 0)) {
671e57b2d0eSRandall Stewart 			lc->lro_bad_csum++;
672e57b2d0eSRandall Stewart 			return (TCP_LRO_CANNOT);
673e57b2d0eSRandall Stewart 		}
674e57b2d0eSRandall Stewart 	} else {
675e57b2d0eSRandall Stewart 		csum = in_cksum_hdr(ip4);
6769ca874cfSHans Petter Selasky 		if (__predict_false(csum != 0)) {
677e57b2d0eSRandall Stewart 			lc->lro_bad_csum++;
678e57b2d0eSRandall Stewart 			return (TCP_LRO_CANNOT);
679e57b2d0eSRandall Stewart 		}
680e57b2d0eSRandall Stewart 	}
681e57b2d0eSRandall Stewart 	return (0);
682e57b2d0eSRandall Stewart }
683e57b2d0eSRandall Stewart #endif
684e57b2d0eSRandall Stewart 
6850a4f8510SRandall Stewart #ifdef TCPHPTS
686e57b2d0eSRandall Stewart static void
6879ca874cfSHans Petter Selasky tcp_lro_log(struct tcpcb *tp, const struct lro_ctrl *lc,
6889ca874cfSHans Petter Selasky     const struct lro_entry *le, const struct mbuf *m,
6899ca874cfSHans Petter Selasky     int frm, int32_t tcp_data_len, uint32_t th_seq,
6909ca874cfSHans Petter Selasky     uint32_t th_ack, uint16_t th_win)
691e57b2d0eSRandall Stewart {
69269c7c811SRandall Stewart 	if (tcp_bblogging_on(tp)) {
693e57b2d0eSRandall Stewart 		union tcp_log_stackspecific log;
694b45daaeaSRandall Stewart 		struct timeval tv, btv;
695e57b2d0eSRandall Stewart 		uint32_t cts;
696e57b2d0eSRandall Stewart 
697e57b2d0eSRandall Stewart 		cts = tcp_get_usecs(&tv);
698e57b2d0eSRandall Stewart 		memset(&log, 0, sizeof(union tcp_log_stackspecific));
699e57b2d0eSRandall Stewart 		log.u_bbr.flex8 = frm;
700e57b2d0eSRandall Stewart 		log.u_bbr.flex1 = tcp_data_len;
701e57b2d0eSRandall Stewart 		if (m)
702e57b2d0eSRandall Stewart 			log.u_bbr.flex2 = m->m_pkthdr.len;
703e57b2d0eSRandall Stewart 		else
704e57b2d0eSRandall Stewart 			log.u_bbr.flex2 = 0;
7054e0ce82bSRandall Stewart 		if (le->m_head) {
7069ca874cfSHans Petter Selasky 			log.u_bbr.flex3 = le->m_head->m_pkthdr.lro_nsegs;
7079ca874cfSHans Petter Selasky 			log.u_bbr.flex4 = le->m_head->m_pkthdr.lro_tcp_d_len;
708e57b2d0eSRandall Stewart 			log.u_bbr.flex5 = le->m_head->m_pkthdr.len;
709e57b2d0eSRandall Stewart 			log.u_bbr.delRate = le->m_head->m_flags;
710e57b2d0eSRandall Stewart 			log.u_bbr.rttProp = le->m_head->m_pkthdr.rcv_tstmp;
71169a34e8dSRandall Stewart 		}
712e57b2d0eSRandall Stewart 		log.u_bbr.inflight = th_seq;
713d7955cc0SRandall Stewart 		log.u_bbr.delivered = th_ack;
714e57b2d0eSRandall Stewart 		log.u_bbr.timeStamp = cts;
715e57b2d0eSRandall Stewart 		log.u_bbr.epoch = le->next_seq;
716e57b2d0eSRandall Stewart 		log.u_bbr.lt_epoch = le->ack_seq;
717e57b2d0eSRandall Stewart 		log.u_bbr.pacing_gain = th_win;
718e57b2d0eSRandall Stewart 		log.u_bbr.cwnd_gain = le->window;
719d7955cc0SRandall Stewart 		log.u_bbr.lost = curcpu;
720b23b156eSWarner Losh 		log.u_bbr.cur_del_rate = (uintptr_t)m;
721b23b156eSWarner Losh 		log.u_bbr.bw_inuse = (uintptr_t)le->m_head;
722b45daaeaSRandall Stewart 		bintime2timeval(&lc->lro_last_queue_time, &btv);
723b45daaeaSRandall Stewart 		log.u_bbr.flex6 = tcp_tv_to_usectick(&btv);
7249ca874cfSHans Petter Selasky 		log.u_bbr.flex7 = le->compressed;
7259ca874cfSHans Petter Selasky 		log.u_bbr.pacing_gain = le->uncompressed;
72669a34e8dSRandall Stewart 		if (in_epoch(net_epoch_preempt))
72769a34e8dSRandall Stewart 			log.u_bbr.inhpts = 1;
72869a34e8dSRandall Stewart 		else
72969a34e8dSRandall Stewart 			log.u_bbr.inhpts = 0;
7309eb0e832SGleb Smirnoff 		TCP_LOG_EVENTP(tp, NULL, &tptosocket(tp)->so_rcv,
7319eb0e832SGleb Smirnoff 		    &tptosocket(tp)->so_snd,
7329eb0e832SGleb Smirnoff 		    TCP_LOG_LRO, 0, 0, &log, false, &tv);
733e57b2d0eSRandall Stewart 	}
734e57b2d0eSRandall Stewart }
7350a4f8510SRandall Stewart #endif
736e57b2d0eSRandall Stewart 
7379ca874cfSHans Petter Selasky static inline void
7389ca874cfSHans Petter Selasky tcp_lro_assign_and_checksum_16(uint16_t *ptr, uint16_t value, uint16_t *psum)
739e57b2d0eSRandall Stewart {
7409ca874cfSHans Petter Selasky 	uint32_t csum;
7416c5087a8SJack F Vogel 
7429ca874cfSHans Petter Selasky 	csum = 0xffff - *ptr + value;
7439ca874cfSHans Petter Selasky 	while (csum > 0xffff)
7449ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
7459ca874cfSHans Petter Selasky 	*ptr = value;
7469ca874cfSHans Petter Selasky 	*psum = csum;
74762b5b6ecSBjoern A. Zeeb }
74862b5b6ecSBjoern A. Zeeb 
7499ca874cfSHans Petter Selasky static uint16_t
7509ca874cfSHans Petter Selasky tcp_lro_update_checksum(const struct lro_parser *pa, const struct lro_entry *le,
7519ca874cfSHans Petter Selasky     uint16_t payload_len, uint16_t delta_sum)
7529ca874cfSHans Petter Selasky {
7539ca874cfSHans Petter Selasky 	uint32_t csum;
7549ca874cfSHans Petter Selasky 	uint16_t tlen;
7559ca874cfSHans Petter Selasky 	uint16_t temp[5] = {};
7569ca874cfSHans Petter Selasky 
7579ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
7589ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
7599ca874cfSHans Petter Selasky 		/* Compute new IPv4 length. */
7609ca874cfSHans Petter Selasky 		tlen = (pa->ip4->ip_hl << 2) + (pa->tcp->th_off << 2) + payload_len;
7619ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]);
7629ca874cfSHans Petter Selasky 
7639ca874cfSHans Petter Selasky 		/* Subtract delta from current IPv4 checksum. */
7649ca874cfSHans Petter Selasky 		csum = pa->ip4->ip_sum + 0xffff - temp[0];
7659ca874cfSHans Petter Selasky 		while (csum > 0xffff)
7669ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
7679ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]);
7689ca874cfSHans Petter Selasky 		goto update_tcp_header;
7699ca874cfSHans Petter Selasky 
7709ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
7719ca874cfSHans Petter Selasky 		/* Compute new IPv6 length. */
7729ca874cfSHans Petter Selasky 		tlen = (pa->tcp->th_off << 2) + payload_len;
7739ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]);
7749ca874cfSHans Petter Selasky 		goto update_tcp_header;
7759ca874cfSHans Petter Selasky 
7769ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_UDP:
7779ca874cfSHans Petter Selasky 		/* Compute new IPv4 length. */
7789ca874cfSHans Petter Selasky 		tlen = (pa->ip4->ip_hl << 2) + sizeof(*pa->udp) + payload_len;
7799ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]);
7809ca874cfSHans Petter Selasky 
7819ca874cfSHans Petter Selasky 		/* Subtract delta from current IPv4 checksum. */
7829ca874cfSHans Petter Selasky 		csum = pa->ip4->ip_sum + 0xffff - temp[0];
7839ca874cfSHans Petter Selasky 		while (csum > 0xffff)
7849ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
7859ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]);
7869ca874cfSHans Petter Selasky 		goto update_udp_header;
7879ca874cfSHans Petter Selasky 
7889ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_UDP:
7899ca874cfSHans Petter Selasky 		/* Compute new IPv6 length. */
7909ca874cfSHans Petter Selasky 		tlen = sizeof(*pa->udp) + payload_len;
7919ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]);
7929ca874cfSHans Petter Selasky 		goto update_udp_header;
7939ca874cfSHans Petter Selasky 
79462b5b6ecSBjoern A. Zeeb 	default:
7959ca874cfSHans Petter Selasky 		return (0);
79662b5b6ecSBjoern A. Zeeb 	}
7979ca874cfSHans Petter Selasky 
7989ca874cfSHans Petter Selasky update_tcp_header:
7999ca874cfSHans Petter Selasky 	/* Compute current TCP header checksum. */
8009ca874cfSHans Petter Selasky 	temp[2] = tcp_lro_rx_csum_tcphdr(pa->tcp);
80162b5b6ecSBjoern A. Zeeb 
80262b5b6ecSBjoern A. Zeeb 	/* Incorporate the latest ACK into the TCP header. */
8039ca874cfSHans Petter Selasky 	pa->tcp->th_ack = le->ack_seq;
8049ca874cfSHans Petter Selasky 	pa->tcp->th_win = le->window;
8059ca874cfSHans Petter Selasky 
80662b5b6ecSBjoern A. Zeeb 	/* Incorporate latest timestamp into the TCP header. */
80762b5b6ecSBjoern A. Zeeb 	if (le->timestamp != 0) {
8086c5087a8SJack F Vogel 		uint32_t *ts_ptr;
8096c5087a8SJack F Vogel 
8109ca874cfSHans Petter Selasky 		ts_ptr = (uint32_t *)(pa->tcp + 1);
81162b5b6ecSBjoern A. Zeeb 		ts_ptr[1] = htonl(le->tsval);
81262b5b6ecSBjoern A. Zeeb 		ts_ptr[2] = le->tsecr;
81362b5b6ecSBjoern A. Zeeb 	}
8149ca874cfSHans Petter Selasky 
8159ca874cfSHans Petter Selasky 	/* Compute new TCP header checksum. */
8169ca874cfSHans Petter Selasky 	temp[3] = tcp_lro_rx_csum_tcphdr(pa->tcp);
8179ca874cfSHans Petter Selasky 
8189ca874cfSHans Petter Selasky 	/* Compute new TCP checksum. */
8199ca874cfSHans Petter Selasky 	csum = pa->tcp->th_sum + 0xffff - delta_sum +
8209ca874cfSHans Petter Selasky 	    0xffff - temp[0] + 0xffff - temp[3] + temp[2];
8219ca874cfSHans Petter Selasky 	while (csum > 0xffff)
8229ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
8239ca874cfSHans Petter Selasky 
8249ca874cfSHans Petter Selasky 	/* Assign new TCP checksum. */
8259ca874cfSHans Petter Selasky 	tcp_lro_assign_and_checksum_16(&pa->tcp->th_sum, csum, &temp[4]);
8269ca874cfSHans Petter Selasky 
8279ca874cfSHans Petter Selasky 	/* Compute all modififications affecting next checksum. */
8289ca874cfSHans Petter Selasky 	csum = temp[0] + temp[1] + 0xffff - temp[2] +
8299ca874cfSHans Petter Selasky 	    temp[3] + temp[4] + delta_sum;
8309ca874cfSHans Petter Selasky 	while (csum > 0xffff)
8319ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
8329ca874cfSHans Petter Selasky 
8339ca874cfSHans Petter Selasky 	/* Return delta checksum to next stage, if any. */
8349ca874cfSHans Petter Selasky 	return (csum);
8359ca874cfSHans Petter Selasky 
8369ca874cfSHans Petter Selasky update_udp_header:
8379ca874cfSHans Petter Selasky 	tlen = sizeof(*pa->udp) + payload_len;
8389ca874cfSHans Petter Selasky 	/* Assign new UDP length and compute checksum delta. */
8399ca874cfSHans Petter Selasky 	tcp_lro_assign_and_checksum_16(&pa->udp->uh_ulen, htons(tlen), &temp[2]);
8409ca874cfSHans Petter Selasky 
8419ca874cfSHans Petter Selasky 	/* Check if there is a UDP checksum. */
8429ca874cfSHans Petter Selasky 	if (__predict_false(pa->udp->uh_sum != 0)) {
8439ca874cfSHans Petter Selasky 		/* Compute new UDP checksum. */
8449ca874cfSHans Petter Selasky 		csum = pa->udp->uh_sum + 0xffff - delta_sum +
8459ca874cfSHans Petter Selasky 		    0xffff - temp[0] + 0xffff - temp[2];
8469ca874cfSHans Petter Selasky 		while (csum > 0xffff)
8479ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
8489ca874cfSHans Petter Selasky 		/* Assign new UDP checksum. */
8499ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->udp->uh_sum, csum, &temp[3]);
850e57b2d0eSRandall Stewart 	}
8519ca874cfSHans Petter Selasky 
8529ca874cfSHans Petter Selasky 	/* Compute all modififications affecting next checksum. */
8539ca874cfSHans Petter Selasky 	csum = temp[0] + temp[1] + temp[2] + temp[3] + delta_sum;
8549ca874cfSHans Petter Selasky 	while (csum > 0xffff)
8559ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
8569ca874cfSHans Petter Selasky 
8579ca874cfSHans Petter Selasky 	/* Return delta checksum to next stage, if any. */
8589ca874cfSHans Petter Selasky 	return (csum);
8599ca874cfSHans Petter Selasky }
8609ca874cfSHans Petter Selasky 
8619ca874cfSHans Petter Selasky static void
8629ca874cfSHans Petter Selasky tcp_flush_out_entry(struct lro_ctrl *lc, struct lro_entry *le)
8639ca874cfSHans Petter Selasky {
8649ca874cfSHans Petter Selasky 	/* Check if we need to recompute any checksums. */
86524fe6643SRyan Stone 	if (le->needs_merge) {
8669ca874cfSHans Petter Selasky 		uint16_t csum;
8679ca874cfSHans Petter Selasky 
8689ca874cfSHans Petter Selasky 		switch (le->inner.data.lro_type) {
8699ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
8709ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->inner, le,
8719ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len,
8729ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_csum);
8739ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->outer, NULL,
8749ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len +
8759ca874cfSHans Petter Selasky 			    le->inner.total_hdr_len, csum);
8769ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
8779ca874cfSHans Petter Selasky 			    CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
8789ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_data = 0xffff;
87910a62eb1SHans Petter Selasky 			if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED))
88010a62eb1SHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED;
8819ca874cfSHans Petter Selasky 			break;
8829ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
8839ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->inner, le,
8849ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len,
8859ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_csum);
8869ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->outer, NULL,
8879ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len +
8889ca874cfSHans Petter Selasky 			    le->inner.total_hdr_len, csum);
8899ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
8909ca874cfSHans Petter Selasky 			    CSUM_PSEUDO_HDR;
8919ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_data = 0xffff;
89210a62eb1SHans Petter Selasky 			if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED))
89310a62eb1SHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED;
8949ca874cfSHans Petter Selasky 			break;
8959ca874cfSHans Petter Selasky 		case LRO_TYPE_NONE:
8969ca874cfSHans Petter Selasky 			switch (le->outer.data.lro_type) {
8979ca874cfSHans Petter Selasky 			case LRO_TYPE_IPV4_TCP:
8989ca874cfSHans Petter Selasky 				csum = tcp_lro_update_checksum(&le->outer, le,
8999ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_len,
9009ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_csum);
9019ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
9029ca874cfSHans Petter Selasky 				    CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
9039ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_data = 0xffff;
90410a62eb1SHans Petter Selasky 				if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED))
90510a62eb1SHans Petter Selasky 					le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED;
9069ca874cfSHans Petter Selasky 				break;
9079ca874cfSHans Petter Selasky 			case LRO_TYPE_IPV6_TCP:
9089ca874cfSHans Petter Selasky 				csum = tcp_lro_update_checksum(&le->outer, le,
9099ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_len,
9109ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_csum);
9119ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
9129ca874cfSHans Petter Selasky 				    CSUM_PSEUDO_HDR;
9139ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_data = 0xffff;
91410a62eb1SHans Petter Selasky 				if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED))
91510a62eb1SHans Petter Selasky 					le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED;
9169ca874cfSHans Petter Selasky 				break;
9179ca874cfSHans Petter Selasky 			default:
9189ca874cfSHans Petter Selasky 				break;
9199ca874cfSHans Petter Selasky 			}
9209ca874cfSHans Petter Selasky 			break;
9219ca874cfSHans Petter Selasky 		default:
9229ca874cfSHans Petter Selasky 			break;
9239ca874cfSHans Petter Selasky 		}
9249ca874cfSHans Petter Selasky 	}
9259ca874cfSHans Petter Selasky 
926e57b2d0eSRandall Stewart 	/*
927e57b2d0eSRandall Stewart 	 * Break any chain, this is not set to NULL on the singleton
928e57b2d0eSRandall Stewart 	 * case m_nextpkt points to m_head. Other case set them
929e57b2d0eSRandall Stewart 	 * m_nextpkt to NULL in push_and_replace.
930e57b2d0eSRandall Stewart 	 */
931e57b2d0eSRandall Stewart 	le->m_head->m_nextpkt = NULL;
9329ca874cfSHans Petter Selasky 	lc->lro_queued += le->m_head->m_pkthdr.lro_nsegs;
933e57b2d0eSRandall Stewart 	(*lc->ifp->if_input)(lc->ifp, le->m_head);
93462b5b6ecSBjoern A. Zeeb }
9356c5087a8SJack F Vogel 
936e57b2d0eSRandall Stewart static void
9379ca874cfSHans Petter Selasky tcp_set_entry_to_mbuf(struct lro_ctrl *lc, struct lro_entry *le,
9389ca874cfSHans Petter Selasky     struct mbuf *m, struct tcphdr *th)
939e57b2d0eSRandall Stewart {
940e57b2d0eSRandall Stewart 	uint32_t *ts_ptr;
941e57b2d0eSRandall Stewart 	uint16_t tcp_data_len;
9429ca874cfSHans Petter Selasky 	uint16_t tcp_opt_len;
943e57b2d0eSRandall Stewart 
944e57b2d0eSRandall Stewart 	ts_ptr = (uint32_t *)(th + 1);
9459ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
9469ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
9479ca874cfSHans Petter Selasky 
9489ca874cfSHans Petter Selasky 	/* Check if there is a timestamp option. */
9499ca874cfSHans Petter Selasky 	if (tcp_opt_len == 0 ||
9509ca874cfSHans Petter Selasky 	    __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
9519ca874cfSHans Petter Selasky 	    *ts_ptr != TCP_LRO_TS_OPTION)) {
9529ca874cfSHans Petter Selasky 		/* We failed to find the timestamp option. */
9539ca874cfSHans Petter Selasky 		le->timestamp = 0;
9549ca874cfSHans Petter Selasky 	} else {
955e57b2d0eSRandall Stewart 		le->timestamp = 1;
956e57b2d0eSRandall Stewart 		le->tsval = ntohl(*(ts_ptr + 1));
957e57b2d0eSRandall Stewart 		le->tsecr = *(ts_ptr + 2);
9589ca874cfSHans Petter Selasky 	}
9599ca874cfSHans Petter Selasky 
9609ca874cfSHans Petter Selasky 	tcp_data_len = m->m_pkthdr.lro_tcp_d_len;
9619ca874cfSHans Petter Selasky 
9629ca874cfSHans Petter Selasky 	/* Pull out TCP sequence numbers and window size. */
963e57b2d0eSRandall Stewart 	le->next_seq = ntohl(th->th_seq) + tcp_data_len;
964e57b2d0eSRandall Stewart 	le->ack_seq = th->th_ack;
965e57b2d0eSRandall Stewart 	le->window = th->th_win;
9661ebf4607SRichard Scheffenegger 	le->flags = tcp_get_flags(th);
96724fe6643SRyan Stone 	le->needs_merge = 0;
9689ca874cfSHans Petter Selasky 
9699ca874cfSHans Petter Selasky 	/* Setup new data pointers. */
970e57b2d0eSRandall Stewart 	le->m_head = m;
971e57b2d0eSRandall Stewart 	le->m_tail = m_last(m);
972e57b2d0eSRandall Stewart }
973e57b2d0eSRandall Stewart 
974e57b2d0eSRandall Stewart static void
9759ca874cfSHans Petter Selasky tcp_push_and_replace(struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m)
976e57b2d0eSRandall Stewart {
9779ca874cfSHans Petter Selasky 	struct lro_parser *pa;
9789ca874cfSHans Petter Selasky 
979e57b2d0eSRandall Stewart 	/*
9809ca874cfSHans Petter Selasky 	 * Push up the stack of the current entry
9819ca874cfSHans Petter Selasky 	 * and replace it with "m".
982e57b2d0eSRandall Stewart 	 */
983e57b2d0eSRandall Stewart 	struct mbuf *msave;
984e57b2d0eSRandall Stewart 
985e57b2d0eSRandall Stewart 	/* Grab off the next and save it */
986e57b2d0eSRandall Stewart 	msave = le->m_head->m_nextpkt;
987e57b2d0eSRandall Stewart 	le->m_head->m_nextpkt = NULL;
9889ca874cfSHans Petter Selasky 
9899ca874cfSHans Petter Selasky 	/* Now push out the old entry */
9909ca874cfSHans Petter Selasky 	tcp_flush_out_entry(lc, le);
9919ca874cfSHans Petter Selasky 
9929ca874cfSHans Petter Selasky 	/* Re-parse new header, should not fail. */
9939ca874cfSHans Petter Selasky 	pa = tcp_lro_parser(m, &le->outer, &le->inner, false);
9949ca874cfSHans Petter Selasky 	KASSERT(pa != NULL,
9959ca874cfSHans Petter Selasky 	    ("tcp_push_and_replace: LRO parser failed on m=%p\n", m));
9969ca874cfSHans Petter Selasky 
997e57b2d0eSRandall Stewart 	/*
9989ca874cfSHans Petter Selasky 	 * Now to replace the data properly in the entry
9999ca874cfSHans Petter Selasky 	 * we have to reset the TCP header and
1000e57b2d0eSRandall Stewart 	 * other fields.
1001e57b2d0eSRandall Stewart 	 */
10029ca874cfSHans Petter Selasky 	tcp_set_entry_to_mbuf(lc, le, m, pa->tcp);
10039ca874cfSHans Petter Selasky 
1004e57b2d0eSRandall Stewart 	/* Restore the next list */
1005e57b2d0eSRandall Stewart 	m->m_nextpkt = msave;
1006e57b2d0eSRandall Stewart }
1007e57b2d0eSRandall Stewart 
1008e57b2d0eSRandall Stewart static void
100924fe6643SRyan Stone tcp_lro_mbuf_append_pkthdr(struct lro_entry *le, const struct mbuf *p)
10109ca874cfSHans Petter Selasky {
101124fe6643SRyan Stone 	struct mbuf *m;
10129ca874cfSHans Petter Selasky 	uint32_t csum;
10139ca874cfSHans Petter Selasky 
101424fe6643SRyan Stone 	m = le->m_head;
10159ca874cfSHans Petter Selasky 	if (m->m_pkthdr.lro_nsegs == 1) {
10169ca874cfSHans Petter Selasky 		/* Compute relative checksum. */
10179ca874cfSHans Petter Selasky 		csum = p->m_pkthdr.lro_tcp_d_csum;
10189ca874cfSHans Petter Selasky 	} else {
10199ca874cfSHans Petter Selasky 		/* Merge TCP data checksums. */
10209ca874cfSHans Petter Selasky 		csum = (uint32_t)m->m_pkthdr.lro_tcp_d_csum +
10219ca874cfSHans Petter Selasky 		    (uint32_t)p->m_pkthdr.lro_tcp_d_csum;
10229ca874cfSHans Petter Selasky 		while (csum > 0xffff)
10239ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
10249ca874cfSHans Petter Selasky 	}
10259ca874cfSHans Petter Selasky 
10269ca874cfSHans Petter Selasky 	/* Update various counters. */
10279ca874cfSHans Petter Selasky 	m->m_pkthdr.len += p->m_pkthdr.lro_tcp_d_len;
10289ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_csum = csum;
10299ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_len += p->m_pkthdr.lro_tcp_d_len;
10309ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_nsegs += p->m_pkthdr.lro_nsegs;
103124fe6643SRyan Stone 	le->needs_merge = 1;
10329ca874cfSHans Petter Selasky }
10339ca874cfSHans Petter Selasky 
10349ca874cfSHans Petter Selasky static void
10359ca874cfSHans Petter Selasky tcp_lro_condense(struct lro_ctrl *lc, struct lro_entry *le)
1036e57b2d0eSRandall Stewart {
1037e57b2d0eSRandall Stewart 	/*
1038e57b2d0eSRandall Stewart 	 * Walk through the mbuf chain we
1039e57b2d0eSRandall Stewart 	 * have on tap and compress/condense
1040e57b2d0eSRandall Stewart 	 * as required.
1041e57b2d0eSRandall Stewart 	 */
1042e57b2d0eSRandall Stewart 	uint32_t *ts_ptr;
1043e57b2d0eSRandall Stewart 	struct mbuf *m;
1044e57b2d0eSRandall Stewart 	struct tcphdr *th;
10459ca874cfSHans Petter Selasky 	uint32_t tcp_data_len_total;
10469ca874cfSHans Petter Selasky 	uint32_t tcp_data_seg_total;
10479ca874cfSHans Petter Selasky 	uint16_t tcp_data_len;
10489ca874cfSHans Petter Selasky 	uint16_t tcp_opt_len;
1049e57b2d0eSRandall Stewart 
1050e57b2d0eSRandall Stewart 	/*
1051e57b2d0eSRandall Stewart 	 * First we must check the lead (m_head)
1052e57b2d0eSRandall Stewart 	 * we must make sure that it is *not*
1053e57b2d0eSRandall Stewart 	 * something that should be sent up
1054e57b2d0eSRandall Stewart 	 * right away (sack etc).
1055e57b2d0eSRandall Stewart 	 */
1056e57b2d0eSRandall Stewart again:
1057e57b2d0eSRandall Stewart 	m = le->m_head->m_nextpkt;
1058e57b2d0eSRandall Stewart 	if (m == NULL) {
10599ca874cfSHans Petter Selasky 		/* Just one left. */
1060e57b2d0eSRandall Stewart 		return;
1061e57b2d0eSRandall Stewart 	}
10629ca874cfSHans Petter Selasky 
10639ca874cfSHans Petter Selasky 	th = tcp_lro_get_th(m);
10649ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
10659ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
1066e57b2d0eSRandall Stewart 	ts_ptr = (uint32_t *)(th + 1);
10679ca874cfSHans Petter Selasky 
10689ca874cfSHans Petter Selasky 	if (tcp_opt_len != 0 && __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
10699ca874cfSHans Petter Selasky 	    *ts_ptr != TCP_LRO_TS_OPTION)) {
1070e57b2d0eSRandall Stewart 		/*
1071e57b2d0eSRandall Stewart 		 * Its not the timestamp. We can't
1072e57b2d0eSRandall Stewart 		 * use this guy as the head.
1073e57b2d0eSRandall Stewart 		 */
1074e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
10759ca874cfSHans Petter Selasky 		tcp_push_and_replace(lc, le, m);
1076e57b2d0eSRandall Stewart 		goto again;
1077e57b2d0eSRandall Stewart 	}
10781ebf4607SRichard Scheffenegger 	if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH)) != 0) {
1079e57b2d0eSRandall Stewart 		/*
10801dadeab3SGordon Bergling 		 * Make sure that previously seen segments/ACKs are delivered
1081e57b2d0eSRandall Stewart 		 * before this segment, e.g. FIN.
1082e57b2d0eSRandall Stewart 		 */
1083e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
10849ca874cfSHans Petter Selasky 		tcp_push_and_replace(lc, le, m);
1085e57b2d0eSRandall Stewart 		goto again;
1086e57b2d0eSRandall Stewart 	}
1087e57b2d0eSRandall Stewart 	while((m = le->m_head->m_nextpkt) != NULL) {
1088e57b2d0eSRandall Stewart 		/*
1089e57b2d0eSRandall Stewart 		 * condense m into le, first
1090e57b2d0eSRandall Stewart 		 * pull m out of the list.
1091e57b2d0eSRandall Stewart 		 */
1092e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
1093e57b2d0eSRandall Stewart 		m->m_nextpkt = NULL;
1094e57b2d0eSRandall Stewart 		/* Setup my data */
10959ca874cfSHans Petter Selasky 		tcp_data_len = m->m_pkthdr.lro_tcp_d_len;
10969ca874cfSHans Petter Selasky 		th = tcp_lro_get_th(m);
1097e57b2d0eSRandall Stewart 		ts_ptr = (uint32_t *)(th + 1);
10989ca874cfSHans Petter Selasky 		tcp_opt_len = (th->th_off << 2);
10999ca874cfSHans Petter Selasky 		tcp_opt_len -= sizeof(*th);
11009ca874cfSHans Petter Selasky 		tcp_data_len_total = le->m_head->m_pkthdr.lro_tcp_d_len + tcp_data_len;
11019ca874cfSHans Petter Selasky 		tcp_data_seg_total = le->m_head->m_pkthdr.lro_nsegs + m->m_pkthdr.lro_nsegs;
11029ca874cfSHans Petter Selasky 
11039ca874cfSHans Petter Selasky 		if (tcp_data_seg_total >= lc->lro_ackcnt_lim ||
11049ca874cfSHans Petter Selasky 		    tcp_data_len_total >= lc->lro_length_lim) {
1105e57b2d0eSRandall Stewart 			/* Flush now if appending will result in overflow. */
11069ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1107e57b2d0eSRandall Stewart 			goto again;
1108e57b2d0eSRandall Stewart 		}
11099ca874cfSHans Petter Selasky 		if (tcp_opt_len != 0 &&
11109ca874cfSHans Petter Selasky 		    __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
11119ca874cfSHans Petter Selasky 		    *ts_ptr != TCP_LRO_TS_OPTION)) {
1112e57b2d0eSRandall Stewart 			/*
1113e57b2d0eSRandall Stewart 			 * Maybe a sack in the new one? We need to
1114e57b2d0eSRandall Stewart 			 * start all over after flushing the
1115e57b2d0eSRandall Stewart 			 * current le. We will go up to the beginning
1116e57b2d0eSRandall Stewart 			 * and flush it (calling the replace again possibly
1117e57b2d0eSRandall Stewart 			 * or just returning).
1118e57b2d0eSRandall Stewart 			 */
11199ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1120e57b2d0eSRandall Stewart 			goto again;
1121e57b2d0eSRandall Stewart 		}
11221ebf4607SRichard Scheffenegger 		if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH)) != 0) {
11239ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1124e57b2d0eSRandall Stewart 			goto again;
1125e57b2d0eSRandall Stewart 		}
11269ca874cfSHans Petter Selasky 		if (tcp_opt_len != 0) {
1127e57b2d0eSRandall Stewart 			uint32_t tsval = ntohl(*(ts_ptr + 1));
1128e57b2d0eSRandall Stewart 			/* Make sure timestamp values are increasing. */
1129e57b2d0eSRandall Stewart 			if (TSTMP_GT(le->tsval, tsval))  {
11309ca874cfSHans Petter Selasky 				tcp_push_and_replace(lc, le, m);
1131e57b2d0eSRandall Stewart 				goto again;
1132e57b2d0eSRandall Stewart 			}
1133e57b2d0eSRandall Stewart 			le->tsval = tsval;
1134e57b2d0eSRandall Stewart 			le->tsecr = *(ts_ptr + 2);
1135e57b2d0eSRandall Stewart 		}
1136e57b2d0eSRandall Stewart 		/* Try to append the new segment. */
1137e57b2d0eSRandall Stewart 		if (__predict_false(ntohl(th->th_seq) != le->next_seq ||
11381ebf4607SRichard Scheffenegger 				    ((tcp_get_flags(th) & TH_ACK) !=
11393284f492SRyan Stone 				      (le->flags & TH_ACK)) ||
1140e57b2d0eSRandall Stewart 				    (tcp_data_len == 0 &&
1141e57b2d0eSRandall Stewart 				     le->ack_seq == th->th_ack &&
1142e57b2d0eSRandall Stewart 				     le->window == th->th_win))) {
11433284f492SRyan Stone 			/* Out of order packet, non-ACK + ACK or dup ACK. */
11449ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1145e57b2d0eSRandall Stewart 			goto again;
1146e57b2d0eSRandall Stewart 		}
11479ca874cfSHans Petter Selasky 		if (tcp_data_len != 0 ||
11489ca874cfSHans Petter Selasky 		    SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
1149e57b2d0eSRandall Stewart 			le->next_seq += tcp_data_len;
1150e57b2d0eSRandall Stewart 			le->ack_seq = th->th_ack;
1151e57b2d0eSRandall Stewart 			le->window = th->th_win;
115224fe6643SRyan Stone 			le->needs_merge = 1;
1153e57b2d0eSRandall Stewart 		} else if (th->th_ack == le->ack_seq) {
115424fe6643SRyan Stone 			if (WIN_GT(th->th_win, le->window)) {
115524fe6643SRyan Stone 				le->window = th->th_win;
115624fe6643SRyan Stone 				le->needs_merge = 1;
115724fe6643SRyan Stone 			}
1158e57b2d0eSRandall Stewart 		}
11599ca874cfSHans Petter Selasky 
1160e57b2d0eSRandall Stewart 		if (tcp_data_len == 0) {
1161e57b2d0eSRandall Stewart 			m_freem(m);
1162e57b2d0eSRandall Stewart 			continue;
1163e57b2d0eSRandall Stewart 		}
11649ca874cfSHans Petter Selasky 
11659ca874cfSHans Petter Selasky 		/* Merge TCP data checksum and length to head mbuf. */
116624fe6643SRyan Stone 		tcp_lro_mbuf_append_pkthdr(le, m);
11679ca874cfSHans Petter Selasky 
1168e57b2d0eSRandall Stewart 		/*
1169e57b2d0eSRandall Stewart 		 * Adjust the mbuf so that m_data points to the first byte of
1170e57b2d0eSRandall Stewart 		 * the ULP payload.  Adjust the mbuf to avoid complications and
1171e57b2d0eSRandall Stewart 		 * append new segment to existing mbuf chain.
1172e57b2d0eSRandall Stewart 		 */
1173e57b2d0eSRandall Stewart 		m_adj(m, m->m_pkthdr.len - tcp_data_len);
1174e57b2d0eSRandall Stewart 		m_demote_pkthdr(m);
1175e57b2d0eSRandall Stewart 		le->m_tail->m_next = m;
1176e57b2d0eSRandall Stewart 		le->m_tail = m_last(m);
1177e57b2d0eSRandall Stewart 	}
1178e57b2d0eSRandall Stewart }
1179e57b2d0eSRandall Stewart 
1180373013b0SConrad Meyer #ifdef TCPHPTS
1181e57b2d0eSRandall Stewart static void
11829ca874cfSHans Petter Selasky tcp_queue_pkts(struct inpcb *inp, struct tcpcb *tp, struct lro_entry *le)
1183e57b2d0eSRandall Stewart {
11849ca874cfSHans Petter Selasky 	INP_WLOCK_ASSERT(inp);
1185e57b2d0eSRandall Stewart 	if (tp->t_in_pkt == NULL) {
1186e57b2d0eSRandall Stewart 		/* Nothing yet there */
1187e57b2d0eSRandall Stewart 		tp->t_in_pkt = le->m_head;
1188e57b2d0eSRandall Stewart 		tp->t_tail_pkt = le->m_last_mbuf;
1189e57b2d0eSRandall Stewart 	} else {
1190e57b2d0eSRandall Stewart 		/* Already some there */
1191e57b2d0eSRandall Stewart 		tp->t_tail_pkt->m_nextpkt = le->m_head;
1192e57b2d0eSRandall Stewart 		tp->t_tail_pkt = le->m_last_mbuf;
1193e57b2d0eSRandall Stewart 	}
1194e57b2d0eSRandall Stewart 	le->m_head = NULL;
1195e57b2d0eSRandall Stewart 	le->m_last_mbuf = NULL;
1196e57b2d0eSRandall Stewart }
1197e57b2d0eSRandall Stewart 
119869a34e8dSRandall Stewart static struct mbuf *
11999ca874cfSHans Petter Selasky tcp_lro_get_last_if_ackcmp(struct lro_ctrl *lc, struct lro_entry *le,
12004e0ce82bSRandall Stewart     struct inpcb *inp, int32_t *new_m, bool can_append_old_cmp)
1201e57b2d0eSRandall Stewart {
120269a34e8dSRandall Stewart 	struct tcpcb *tp;
12039ca874cfSHans Petter Selasky 	struct mbuf *m;
1204e57b2d0eSRandall Stewart 
120569a34e8dSRandall Stewart 	tp = intotcpcb(inp);
12069ca874cfSHans Petter Selasky 	if (__predict_false(tp == NULL))
12079ca874cfSHans Petter Selasky 		return (NULL);
12089ca874cfSHans Petter Selasky 
120969a34e8dSRandall Stewart 	/* Look at the last mbuf if any in queue */
12104e0ce82bSRandall Stewart  	if (can_append_old_cmp) {
121169a34e8dSRandall Stewart 		m = tp->t_tail_pkt;
12129ca874cfSHans Petter Selasky 		if (m != NULL && (m->m_flags & M_ACKCMP) != 0) {
12139ca874cfSHans Petter Selasky 			if (M_TRAILINGSPACE(m) >= sizeof(struct tcp_ackent)) {
12149ca874cfSHans Petter Selasky 				tcp_lro_log(tp, lc, le, NULL, 23, 0, 0, 0, 0);
12159ca874cfSHans Petter Selasky 				*new_m = 0;
12169ca874cfSHans Petter Selasky 				counter_u64_add(tcp_extra_mbuf, 1);
12179ca874cfSHans Petter Selasky 				return (m);
121869a34e8dSRandall Stewart 			} else {
12199ca874cfSHans Petter Selasky 				/* Mark we ran out of space */
122069a34e8dSRandall Stewart 				inp->inp_flags2 |= INP_MBUF_L_ACKS;
122169a34e8dSRandall Stewart 			}
122269a34e8dSRandall Stewart 		}
12234e0ce82bSRandall Stewart 	}
12249ca874cfSHans Petter Selasky 	/* Decide mbuf size. */
12254e0ce82bSRandall Stewart 	tcp_lro_log(tp, lc, le, NULL, 21, 0, 0, 0, 0);
12269ca874cfSHans Petter Selasky 	if (inp->inp_flags2 & INP_MBUF_L_ACKS)
12279ca874cfSHans Petter Selasky 		m = m_getcl(M_NOWAIT, MT_DATA, M_ACKCMP | M_PKTHDR);
12289ca874cfSHans Petter Selasky 	else
12299ca874cfSHans Petter Selasky 		m = m_gethdr(M_NOWAIT, MT_DATA);
12309ca874cfSHans Petter Selasky 
12319ca874cfSHans Petter Selasky 	if (__predict_false(m == NULL)) {
12329ca874cfSHans Petter Selasky 		counter_u64_add(tcp_would_have_but, 1);
12339ca874cfSHans Petter Selasky 		return (NULL);
123469a34e8dSRandall Stewart 	}
12359ca874cfSHans Petter Selasky 	counter_u64_add(tcp_comp_total, 1);
12364e0ce82bSRandall Stewart  	m->m_pkthdr.rcvif = lc->ifp;
12379ca874cfSHans Petter Selasky 	m->m_flags |= M_ACKCMP;
12389ca874cfSHans Petter Selasky 	*new_m = 1;
123969a34e8dSRandall Stewart 	return (m);
124069a34e8dSRandall Stewart }
124169a34e8dSRandall Stewart 
124269a34e8dSRandall Stewart static struct inpcb *
12439ca874cfSHans Petter Selasky tcp_lro_lookup(struct ifnet *ifp, struct lro_parser *pa)
124469a34e8dSRandall Stewart {
12459ca874cfSHans Petter Selasky 	struct inpcb *inp;
124669a34e8dSRandall Stewart 
12479ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
1248e57b2d0eSRandall Stewart #ifdef INET6
12499ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
12509ca874cfSHans Petter Selasky 		inp = in6_pcblookup(&V_tcbinfo,
12519ca874cfSHans Petter Selasky 		    &pa->data.s_addr.v6,
12529ca874cfSHans Petter Selasky 		    pa->data.s_port,
12539ca874cfSHans Petter Selasky 		    &pa->data.d_addr.v6,
12549ca874cfSHans Petter Selasky 		    pa->data.d_port,
1255e57b2d0eSRandall Stewart 		    INPLOOKUP_WLOCKPCB,
12569ca874cfSHans Petter Selasky 		    ifp);
1257e57b2d0eSRandall Stewart 		break;
1258e57b2d0eSRandall Stewart #endif
1259e57b2d0eSRandall Stewart #ifdef INET
12609ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
12619ca874cfSHans Petter Selasky 		inp = in_pcblookup(&V_tcbinfo,
12629ca874cfSHans Petter Selasky 		    pa->data.s_addr.v4,
12639ca874cfSHans Petter Selasky 		    pa->data.s_port,
12649ca874cfSHans Petter Selasky 		    pa->data.d_addr.v4,
12659ca874cfSHans Petter Selasky 		    pa->data.d_port,
1266e57b2d0eSRandall Stewart 		    INPLOOKUP_WLOCKPCB,
12679ca874cfSHans Petter Selasky 		    ifp);
1268e57b2d0eSRandall Stewart 		break;
1269e57b2d0eSRandall Stewart #endif
12709ca874cfSHans Petter Selasky 	default:
12719ca874cfSHans Petter Selasky 		inp = NULL;
12729ca874cfSHans Petter Selasky 		break;
1273e57b2d0eSRandall Stewart 	}
127469a34e8dSRandall Stewart 	return (inp);
127569a34e8dSRandall Stewart }
127669a34e8dSRandall Stewart 
12779ca874cfSHans Petter Selasky static inline bool
12789ca874cfSHans Petter Selasky tcp_lro_ack_valid(struct mbuf *m, struct tcphdr *th, uint32_t **ppts, bool *other_opts)
12799ca874cfSHans Petter Selasky {
12809ca874cfSHans Petter Selasky 	/*
12819ca874cfSHans Petter Selasky 	 * This function returns two bits of valuable information.
12829ca874cfSHans Petter Selasky 	 * a) Is what is present capable of being ack-compressed,
12839ca874cfSHans Petter Selasky 	 *    we can ack-compress if there is no options or just
12849ca874cfSHans Petter Selasky 	 *    a timestamp option, and of course the th_flags must
12859ca874cfSHans Petter Selasky 	 *    be correct as well.
12869ca874cfSHans Petter Selasky 	 * b) Our other options present such as SACK. This is
12879ca874cfSHans Petter Selasky 	 *    used to determine if we want to wakeup or not.
12889ca874cfSHans Petter Selasky 	 */
12899ca874cfSHans Petter Selasky 	bool ret = true;
12909ca874cfSHans Petter Selasky 
12919ca874cfSHans Petter Selasky 	switch (th->th_off << 2) {
12929ca874cfSHans Petter Selasky 	case (sizeof(*th) + TCPOLEN_TSTAMP_APPA):
12939ca874cfSHans Petter Selasky 		*ppts = (uint32_t *)(th + 1);
12949ca874cfSHans Petter Selasky 		/* Check if we have only one timestamp option. */
12959ca874cfSHans Petter Selasky 		if (**ppts == TCP_LRO_TS_OPTION)
12969ca874cfSHans Petter Selasky 			*other_opts = false;
12979ca874cfSHans Petter Selasky 		else {
12989ca874cfSHans Petter Selasky 			*other_opts = true;
12999ca874cfSHans Petter Selasky 			ret = false;
13009ca874cfSHans Petter Selasky 		}
13019ca874cfSHans Petter Selasky 		break;
13029ca874cfSHans Petter Selasky 	case (sizeof(*th)):
13039ca874cfSHans Petter Selasky 		/* No options. */
13049ca874cfSHans Petter Selasky 		*ppts = NULL;
13059ca874cfSHans Petter Selasky 		*other_opts = false;
13069ca874cfSHans Petter Selasky 		break;
13079ca874cfSHans Petter Selasky 	default:
13089ca874cfSHans Petter Selasky 		*ppts = NULL;
13099ca874cfSHans Petter Selasky 		*other_opts = true;
13109ca874cfSHans Petter Selasky 		ret = false;
13119ca874cfSHans Petter Selasky 		break;
13129ca874cfSHans Petter Selasky 	}
13139ca874cfSHans Petter Selasky 	/* For ACKCMP we only accept ACK, PUSH, ECE and CWR. */
13141ebf4607SRichard Scheffenegger 	if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH | TH_ECE | TH_CWR)) != 0)
13159ca874cfSHans Petter Selasky 		ret = false;
13169ca874cfSHans Petter Selasky 	/* If it has data on it we cannot compress it */
13179ca874cfSHans Petter Selasky 	if (m->m_pkthdr.lro_tcp_d_len)
13189ca874cfSHans Petter Selasky 		ret = false;
13199ca874cfSHans Petter Selasky 
13209ca874cfSHans Petter Selasky 	/* ACK flag must be set. */
13211ebf4607SRichard Scheffenegger 	if (!(tcp_get_flags(th) & TH_ACK))
13229ca874cfSHans Petter Selasky 		ret = false;
13239ca874cfSHans Petter Selasky 	return (ret);
13249ca874cfSHans Petter Selasky }
13259ca874cfSHans Petter Selasky 
13269ca874cfSHans Petter Selasky static int
13279ca874cfSHans Petter Selasky tcp_lro_flush_tcphpts(struct lro_ctrl *lc, struct lro_entry *le)
13289ca874cfSHans Petter Selasky {
13299ca874cfSHans Petter Selasky 	struct inpcb *inp;
13309ca874cfSHans Petter Selasky 	struct tcpcb *tp;
13319ca874cfSHans Petter Selasky 	struct mbuf **pp, *cmp, *mv_to;
13322c6ff1d6SAndrew Gallatin 	struct ifnet *lagg_ifp;
13334e0ce82bSRandall Stewart  	bool bpf_req, lagg_bpf_req, should_wake, can_append_old_cmp;
13349ca874cfSHans Petter Selasky 
13359ca874cfSHans Petter Selasky 	/* Check if packet doesn't belongs to our network interface. */
13369ca874cfSHans Petter Selasky 	if ((tcplro_stacks_wanting_mbufq == 0) ||
13379ca874cfSHans Petter Selasky 	    (le->outer.data.vlan_id != 0) ||
13389ca874cfSHans Petter Selasky 	    (le->inner.data.lro_type != LRO_TYPE_NONE))
13399ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
13409ca874cfSHans Petter Selasky 
13419ca874cfSHans Petter Selasky #ifdef INET6
13429ca874cfSHans Petter Selasky 	/*
13439ca874cfSHans Petter Selasky 	 * Be proactive about unspecified IPv6 address in source. As
13449ca874cfSHans Petter Selasky 	 * we use all-zero to indicate unbounded/unconnected pcb,
13459ca874cfSHans Petter Selasky 	 * unspecified IPv6 address can be used to confuse us.
13469ca874cfSHans Petter Selasky 	 *
13479ca874cfSHans Petter Selasky 	 * Note that packets with unspecified IPv6 destination is
13489ca874cfSHans Petter Selasky 	 * already dropped in ip6_input.
13499ca874cfSHans Petter Selasky 	 */
13509ca874cfSHans Petter Selasky 	if (__predict_false(le->outer.data.lro_type == LRO_TYPE_IPV6_TCP &&
13519ca874cfSHans Petter Selasky 	    IN6_IS_ADDR_UNSPECIFIED(&le->outer.data.s_addr.v6)))
13529ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
13539ca874cfSHans Petter Selasky 
13549ca874cfSHans Petter Selasky 	if (__predict_false(le->inner.data.lro_type == LRO_TYPE_IPV6_TCP &&
13559ca874cfSHans Petter Selasky 	    IN6_IS_ADDR_UNSPECIFIED(&le->inner.data.s_addr.v6)))
13569ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
135769a34e8dSRandall Stewart #endif
13589ca874cfSHans Petter Selasky 	/* Lookup inp, if any. */
13599ca874cfSHans Petter Selasky 	inp = tcp_lro_lookup(lc->ifp,
13609ca874cfSHans Petter Selasky 	    (le->inner.data.lro_type == LRO_TYPE_NONE) ? &le->outer : &le->inner);
13619ca874cfSHans Petter Selasky 	if (inp == NULL)
13629ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
136369a34e8dSRandall Stewart 
13649ca874cfSHans Petter Selasky 	counter_u64_add(tcp_inp_lro_locks_taken, 1);
13659ca874cfSHans Petter Selasky 
13669ca874cfSHans Petter Selasky 	/* Get TCP control structure. */
13679ca874cfSHans Petter Selasky 	tp = intotcpcb(inp);
13689ca874cfSHans Petter Selasky 
13699ca874cfSHans Petter Selasky 	/* Check if the inp is dead, Jim. */
1370f567d55fSGleb Smirnoff 	if (tp->t_state == TCPS_TIME_WAIT) {
13719ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
13729ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
137369a34e8dSRandall Stewart 	}
1374d7955cc0SRandall Stewart 	if ((inp->inp_irq_cpu_set == 0)  && (lc->lro_cpu_is_set == 1)) {
1375d7955cc0SRandall Stewart 		inp->inp_irq_cpu = lc->lro_last_cpu;
1376d7955cc0SRandall Stewart 		inp->inp_irq_cpu_set = 1;
1377d7955cc0SRandall Stewart 	}
13789ca874cfSHans Petter Selasky 	/* Check if the transport doesn't support the needed optimizations. */
13799ca874cfSHans Petter Selasky 	if ((inp->inp_flags2 & (INP_SUPPORTS_MBUFQ | INP_MBUF_ACKCMP)) == 0) {
13809ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
13819ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
138269a34e8dSRandall Stewart 	}
13839ca874cfSHans Petter Selasky 
13849ca874cfSHans Petter Selasky 	if (inp->inp_flags2 & INP_MBUF_QUEUE_READY)
13859ca874cfSHans Petter Selasky 		should_wake = false;
13869ca874cfSHans Petter Selasky 	else
13879ca874cfSHans Petter Selasky 		should_wake = true;
13889ca874cfSHans Petter Selasky 	/* Check if packets should be tapped to BPF. */
13899ca874cfSHans Petter Selasky 	bpf_req = bpf_peers_present(lc->ifp->if_bpf);
13902c6ff1d6SAndrew Gallatin 	lagg_bpf_req = false;
13912c6ff1d6SAndrew Gallatin 	lagg_ifp = NULL;
13922c6ff1d6SAndrew Gallatin 	if (lc->ifp->if_type == IFT_IEEE8023ADLAG ||
13932c6ff1d6SAndrew Gallatin 	    lc->ifp->if_type == IFT_INFINIBANDLAG) {
13942c6ff1d6SAndrew Gallatin 		struct lagg_port *lp = lc->ifp->if_lagg;
13952c6ff1d6SAndrew Gallatin 		struct lagg_softc *sc = lp->lp_softc;
13962c6ff1d6SAndrew Gallatin 
13972c6ff1d6SAndrew Gallatin 		lagg_ifp = sc->sc_ifp;
13982c6ff1d6SAndrew Gallatin 		if (lagg_ifp != NULL)
13992c6ff1d6SAndrew Gallatin 			lagg_bpf_req = bpf_peers_present(lagg_ifp->if_bpf);
14002c6ff1d6SAndrew Gallatin 	}
14019ca874cfSHans Petter Selasky 
14029ca874cfSHans Petter Selasky 	/* Strip and compress all the incoming packets. */
14034e0ce82bSRandall Stewart  	can_append_old_cmp = true;
14049ca874cfSHans Petter Selasky 	cmp = NULL;
14059ca874cfSHans Petter Selasky 	for (pp = &le->m_head; *pp != NULL; ) {
14069ca874cfSHans Petter Selasky 		mv_to = NULL;
14079ca874cfSHans Petter Selasky 		if (do_bpf_strip_and_compress(inp, lc, le, pp,
14082c6ff1d6SAndrew Gallatin 			&cmp, &mv_to, &should_wake, bpf_req,
14094e0ce82bSRandall Stewart  			lagg_bpf_req, lagg_ifp, can_append_old_cmp) == false) {
14109ca874cfSHans Petter Selasky 			/* Advance to next mbuf. */
14119ca874cfSHans Petter Selasky 			pp = &(*pp)->m_nextpkt;
14124e0ce82bSRandall Stewart  			/*
14134e0ce82bSRandall Stewart  			 * Once we have appended we can't look in the pending
14144e0ce82bSRandall Stewart  			 * inbound packets for a compressed ack to append to.
14154e0ce82bSRandall Stewart  			 */
14164e0ce82bSRandall Stewart  			can_append_old_cmp = false;
14174e0ce82bSRandall Stewart  			/*
14184e0ce82bSRandall Stewart  			 * Once we append we also need to stop adding to any
14194e0ce82bSRandall Stewart  			 * compressed ack we were remembering. A new cmp
14204e0ce82bSRandall Stewart  			 * ack will be required.
14214e0ce82bSRandall Stewart  			 */
14224e0ce82bSRandall Stewart  			cmp = NULL;
14234e0ce82bSRandall Stewart  			tcp_lro_log(tp, lc, le, NULL, 25, 0, 0, 0, 0);
14249ca874cfSHans Petter Selasky 		} else if (mv_to != NULL) {
14259ca874cfSHans Petter Selasky 			/* We are asked to move pp up */
14269ca874cfSHans Petter Selasky 			pp = &mv_to->m_nextpkt;
14274e0ce82bSRandall Stewart  			tcp_lro_log(tp, lc, le, NULL, 24, 0, 0, 0, 0);
14284e0ce82bSRandall Stewart 		} else
14294e0ce82bSRandall Stewart  			tcp_lro_log(tp, lc, le, NULL, 26, 0, 0, 0, 0);
14309ca874cfSHans Petter Selasky 	}
14319ca874cfSHans Petter Selasky 	/* Update "m_last_mbuf", if any. */
14329ca874cfSHans Petter Selasky 	if (pp == &le->m_head)
14339ca874cfSHans Petter Selasky 		le->m_last_mbuf = *pp;
14349ca874cfSHans Petter Selasky 	else
14359ca874cfSHans Petter Selasky 		le->m_last_mbuf = __containerof(pp, struct mbuf, m_nextpkt);
14369ca874cfSHans Petter Selasky 
14379ca874cfSHans Petter Selasky 	/* Check if any data mbufs left. */
14389ca874cfSHans Petter Selasky 	if (le->m_head != NULL) {
14399ca874cfSHans Petter Selasky 		counter_u64_add(tcp_inp_lro_direct_queue, 1);
1440a370832bSGleb Smirnoff 		tcp_lro_log(tp, lc, le, NULL, 22, 1, inp->inp_flags2, 0, 1);
14419ca874cfSHans Petter Selasky 		tcp_queue_pkts(inp, tp, le);
14429ca874cfSHans Petter Selasky 	}
14439ca874cfSHans Petter Selasky 	if (should_wake) {
14449ca874cfSHans Petter Selasky 		/* Wakeup */
14459ca874cfSHans Petter Selasky 		counter_u64_add(tcp_inp_lro_wokeup_queue, 1);
14469ca874cfSHans Petter Selasky 		if ((*tp->t_fb->tfb_do_queued_segments)(inp->inp_socket, tp, 0))
14479ca874cfSHans Petter Selasky 			inp = NULL;
14489ca874cfSHans Petter Selasky 	}
14499ca874cfSHans Petter Selasky 	if (inp != NULL)
14509ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
14519ca874cfSHans Petter Selasky 	return (0);	/* Success. */
145269a34e8dSRandall Stewart }
145369a34e8dSRandall Stewart #endif
145469a34e8dSRandall Stewart 
145569a34e8dSRandall Stewart void
145669a34e8dSRandall Stewart tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le)
145769a34e8dSRandall Stewart {
14589ca874cfSHans Petter Selasky 	/* Only optimise if there are multiple packets waiting. */
145969a34e8dSRandall Stewart #ifdef TCPHPTS
14609ca874cfSHans Petter Selasky 	int error;
1461dc6ab77dSMichael Tuexen #endif
146269a34e8dSRandall Stewart 
1463dc6ab77dSMichael Tuexen 	NET_EPOCH_ASSERT();
1464dc6ab77dSMichael Tuexen #ifdef TCPHPTS
146569a34e8dSRandall Stewart 	CURVNET_SET(lc->ifp->if_vnet);
14669ca874cfSHans Petter Selasky 	error = tcp_lro_flush_tcphpts(lc, le);
14679ca874cfSHans Petter Selasky 	CURVNET_RESTORE();
14689ca874cfSHans Petter Selasky 	if (error != 0) {
14699ca874cfSHans Petter Selasky #endif
14709ca874cfSHans Petter Selasky 		tcp_lro_condense(lc, le);
14719ca874cfSHans Petter Selasky 		tcp_flush_out_entry(lc, le);
1472e57b2d0eSRandall Stewart #ifdef TCPHPTS
1473e57b2d0eSRandall Stewart 	}
1474e57b2d0eSRandall Stewart #endif
147562b5b6ecSBjoern A. Zeeb 	lc->lro_flushed++;
147662b5b6ecSBjoern A. Zeeb 	bzero(le, sizeof(*le));
14771ea44822SSepherosa Ziehau 	LIST_INSERT_HEAD(&lc->lro_free, le, next);
147862b5b6ecSBjoern A. Zeeb }
14796c5087a8SJack F Vogel 
1480fc271df3SHans Petter Selasky #ifdef HAVE_INLINE_FLSLL
1481fc271df3SHans Petter Selasky #define	tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1))
1482fc271df3SHans Petter Selasky #else
1483fc271df3SHans Petter Selasky static inline uint64_t
1484fc271df3SHans Petter Selasky tcp_lro_msb_64(uint64_t x)
1485e936121dSHans Petter Selasky {
1486fc271df3SHans Petter Selasky 	x |= (x >> 1);
1487fc271df3SHans Petter Selasky 	x |= (x >> 2);
1488fc271df3SHans Petter Selasky 	x |= (x >> 4);
1489fc271df3SHans Petter Selasky 	x |= (x >> 8);
1490fc271df3SHans Petter Selasky 	x |= (x >> 16);
1491fc271df3SHans Petter Selasky 	x |= (x >> 32);
1492fc271df3SHans Petter Selasky 	return (x & ~(x >> 1));
1493fc271df3SHans Petter Selasky }
1494fc271df3SHans Petter Selasky #endif
1495e936121dSHans Petter Selasky 
1496fc271df3SHans Petter Selasky /*
1497fc271df3SHans Petter Selasky  * The tcp_lro_sort() routine is comparable to qsort(), except it has
1498fc271df3SHans Petter Selasky  * a worst case complexity limit of O(MIN(N,64)*N), where N is the
1499fc271df3SHans Petter Selasky  * number of elements to sort and 64 is the number of sequence bits
1500fc271df3SHans Petter Selasky  * available. The algorithm is bit-slicing the 64-bit sequence number,
1501fc271df3SHans Petter Selasky  * sorting one bit at a time from the most significant bit until the
1502ec668905SHans Petter Selasky  * least significant one, skipping the constant bits. This is
1503ec668905SHans Petter Selasky  * typically called a radix sort.
1504fc271df3SHans Petter Selasky  */
1505fc271df3SHans Petter Selasky static void
1506fc271df3SHans Petter Selasky tcp_lro_sort(struct lro_mbuf_sort *parray, uint32_t size)
1507fc271df3SHans Petter Selasky {
1508fc271df3SHans Petter Selasky 	struct lro_mbuf_sort temp;
1509fc271df3SHans Petter Selasky 	uint64_t ones;
1510fc271df3SHans Petter Selasky 	uint64_t zeros;
1511fc271df3SHans Petter Selasky 	uint32_t x;
1512fc271df3SHans Petter Selasky 	uint32_t y;
1513e936121dSHans Petter Selasky 
1514fc271df3SHans Petter Selasky repeat:
1515ec668905SHans Petter Selasky 	/* for small arrays insertion sort is faster */
1516fc271df3SHans Petter Selasky 	if (size <= 12) {
1517ec668905SHans Petter Selasky 		for (x = 1; x < size; x++) {
1518fc271df3SHans Petter Selasky 			temp = parray[x];
1519ec668905SHans Petter Selasky 			for (y = x; y > 0 && temp.seq < parray[y - 1].seq; y--)
1520ec668905SHans Petter Selasky 				parray[y] = parray[y - 1];
1521fc271df3SHans Petter Selasky 			parray[y] = temp;
1522fc271df3SHans Petter Selasky 		}
1523fc271df3SHans Petter Selasky 		return;
1524fc271df3SHans Petter Selasky 	}
1525e936121dSHans Petter Selasky 
1526fc271df3SHans Petter Selasky 	/* compute sequence bits which are constant */
1527fc271df3SHans Petter Selasky 	ones = 0;
1528fc271df3SHans Petter Selasky 	zeros = 0;
1529fc271df3SHans Petter Selasky 	for (x = 0; x != size; x++) {
1530fc271df3SHans Petter Selasky 		ones |= parray[x].seq;
1531fc271df3SHans Petter Selasky 		zeros |= ~parray[x].seq;
1532fc271df3SHans Petter Selasky 	}
1533fc271df3SHans Petter Selasky 
1534fc271df3SHans Petter Selasky 	/* compute bits which are not constant into "ones" */
1535fc271df3SHans Petter Selasky 	ones &= zeros;
1536fc271df3SHans Petter Selasky 	if (ones == 0)
1537fc271df3SHans Petter Selasky 		return;
1538fc271df3SHans Petter Selasky 
1539fc271df3SHans Petter Selasky 	/* pick the most significant bit which is not constant */
1540fc271df3SHans Petter Selasky 	ones = tcp_lro_msb_64(ones);
1541fc271df3SHans Petter Selasky 
1542fc271df3SHans Petter Selasky 	/*
1543fc271df3SHans Petter Selasky 	 * Move entries having cleared sequence bits to the beginning
1544fc271df3SHans Petter Selasky 	 * of the array:
1545fc271df3SHans Petter Selasky 	 */
1546fc271df3SHans Petter Selasky 	for (x = y = 0; y != size; y++) {
1547fc271df3SHans Petter Selasky 		/* skip set bits */
1548fc271df3SHans Petter Selasky 		if (parray[y].seq & ones)
1549fc271df3SHans Petter Selasky 			continue;
1550fc271df3SHans Petter Selasky 		/* swap entries */
1551fc271df3SHans Petter Selasky 		temp = parray[x];
1552fc271df3SHans Petter Selasky 		parray[x] = parray[y];
1553fc271df3SHans Petter Selasky 		parray[y] = temp;
1554fc271df3SHans Petter Selasky 		x++;
1555fc271df3SHans Petter Selasky 	}
1556fc271df3SHans Petter Selasky 
1557fc271df3SHans Petter Selasky 	KASSERT(x != 0 && x != size, ("Memory is corrupted\n"));
1558fc271df3SHans Petter Selasky 
1559fc271df3SHans Petter Selasky 	/* sort zeros */
1560fc271df3SHans Petter Selasky 	tcp_lro_sort(parray, x);
1561fc271df3SHans Petter Selasky 
1562fc271df3SHans Petter Selasky 	/* sort ones */
1563fc271df3SHans Petter Selasky 	parray += x;
1564fc271df3SHans Petter Selasky 	size -= x;
1565fc271df3SHans Petter Selasky 	goto repeat;
1566e936121dSHans Petter Selasky }
1567e936121dSHans Petter Selasky 
1568e936121dSHans Petter Selasky void
1569e936121dSHans Petter Selasky tcp_lro_flush_all(struct lro_ctrl *lc)
1570e936121dSHans Petter Selasky {
1571fc271df3SHans Petter Selasky 	uint64_t seq;
1572fc271df3SHans Petter Selasky 	uint64_t nseq;
1573e936121dSHans Petter Selasky 	unsigned x;
1574e936121dSHans Petter Selasky 
1575dc6ab77dSMichael Tuexen 	NET_EPOCH_ASSERT();
1576e936121dSHans Petter Selasky 	/* check if no mbufs to flush */
15776dd38b87SSepherosa Ziehau 	if (lc->lro_mbuf_count == 0)
1578e936121dSHans Petter Selasky 		goto done;
1579d7955cc0SRandall Stewart 	if (lc->lro_cpu_is_set == 0) {
1580d7955cc0SRandall Stewart 		if (lc->lro_last_cpu == curcpu) {
1581d7955cc0SRandall Stewart 			lc->lro_cnt_of_same_cpu++;
1582d7955cc0SRandall Stewart 			/* Have we reached the threshold to declare a cpu? */
1583d7955cc0SRandall Stewart 			if (lc->lro_cnt_of_same_cpu > tcp_lro_cpu_set_thresh)
1584d7955cc0SRandall Stewart 				lc->lro_cpu_is_set = 1;
1585d7955cc0SRandall Stewart 		} else {
1586d7955cc0SRandall Stewart 			lc->lro_last_cpu = curcpu;
1587d7955cc0SRandall Stewart 			lc->lro_cnt_of_same_cpu = 0;
1588d7955cc0SRandall Stewart 		}
1589d7955cc0SRandall Stewart 	}
1590a9b66dbdSHans Petter Selasky 	CURVNET_SET(lc->ifp->if_vnet);
1591a9b66dbdSHans Petter Selasky 
15929ca874cfSHans Petter Selasky 	/* get current time */
1593b45daaeaSRandall Stewart 	binuptime(&lc->lro_last_queue_time);
15949ca874cfSHans Petter Selasky 
1595e936121dSHans Petter Selasky 	/* sort all mbufs according to stream */
1596fc271df3SHans Petter Selasky 	tcp_lro_sort(lc->lro_mbuf_data, lc->lro_mbuf_count);
1597e936121dSHans Petter Selasky 
1598e936121dSHans Petter Selasky 	/* input data into LRO engine, stream by stream */
1599fc271df3SHans Petter Selasky 	seq = 0;
1600e936121dSHans Petter Selasky 	for (x = 0; x != lc->lro_mbuf_count; x++) {
1601e936121dSHans Petter Selasky 		struct mbuf *mb;
1602e936121dSHans Petter Selasky 
1603fc271df3SHans Petter Selasky 		/* get mbuf */
1604fc271df3SHans Petter Selasky 		mb = lc->lro_mbuf_data[x].mb;
1605fc271df3SHans Petter Selasky 
1606fc271df3SHans Petter Selasky 		/* get sequence number, masking away the packet index */
1607fc271df3SHans Petter Selasky 		nseq = lc->lro_mbuf_data[x].seq & (-1ULL << 24);
1608e936121dSHans Petter Selasky 
1609e936121dSHans Petter Selasky 		/* check for new stream */
1610fc271df3SHans Petter Selasky 		if (seq != nseq) {
1611fc271df3SHans Petter Selasky 			seq = nseq;
1612e936121dSHans Petter Selasky 
1613e936121dSHans Petter Selasky 			/* flush active streams */
16146dd38b87SSepherosa Ziehau 			tcp_lro_rx_done(lc);
1615e936121dSHans Petter Selasky 		}
1616fc271df3SHans Petter Selasky 
1617e936121dSHans Petter Selasky 		/* add packet to LRO engine */
16189ca874cfSHans Petter Selasky 		if (tcp_lro_rx_common(lc, mb, 0, false) != 0) {
16194e0ce82bSRandall Stewart  			/* Flush anything we have acummulated */
16204e0ce82bSRandall Stewart  			tcp_lro_flush_active(lc);
1621e936121dSHans Petter Selasky 			/* input packet to network layer */
1622e936121dSHans Petter Selasky 			(*lc->ifp->if_input)(lc->ifp, mb);
1623e936121dSHans Petter Selasky 			lc->lro_queued++;
1624e936121dSHans Petter Selasky 			lc->lro_flushed++;
1625e936121dSHans Petter Selasky 		}
1626e936121dSHans Petter Selasky 	}
1627a9b66dbdSHans Petter Selasky 	CURVNET_RESTORE();
1628e936121dSHans Petter Selasky done:
1629e936121dSHans Petter Selasky 	/* flush active streams */
16306dd38b87SSepherosa Ziehau 	tcp_lro_rx_done(lc);
16316dd38b87SSepherosa Ziehau 
1632d7955cc0SRandall Stewart #ifdef TCPHPTS
1633d7955cc0SRandall Stewart 	tcp_run_hpts();
1634d7955cc0SRandall Stewart #endif
1635e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
163662b5b6ecSBjoern A. Zeeb }
16376c5087a8SJack F Vogel 
1638ab4fad4bSRandall Stewart #ifdef TCPHPTS
163969a34e8dSRandall Stewart static void
16409ca874cfSHans Petter Selasky build_ack_entry(struct tcp_ackent *ae, struct tcphdr *th, struct mbuf *m,
16419ca874cfSHans Petter Selasky     uint32_t *ts_ptr, uint16_t iptos)
164269a34e8dSRandall Stewart {
164369a34e8dSRandall Stewart 	/*
16449ca874cfSHans Petter Selasky 	 * Given a TCP ACK, summarize it down into the small TCP ACK
16459ca874cfSHans Petter Selasky 	 * entry.
164669a34e8dSRandall Stewart 	 */
164769a34e8dSRandall Stewart 	ae->timestamp = m->m_pkthdr.rcv_tstmp;
16484e0ce82bSRandall Stewart 	ae->flags = 0;
164969a34e8dSRandall Stewart 	if (m->m_flags & M_TSTMP_LRO)
16504e0ce82bSRandall Stewart 		ae->flags |= TSTMP_LRO;
165169a34e8dSRandall Stewart 	else if (m->m_flags & M_TSTMP)
16524e0ce82bSRandall Stewart 		ae->flags |= TSTMP_HDWR;
165369a34e8dSRandall Stewart 	ae->seq = ntohl(th->th_seq);
165469a34e8dSRandall Stewart 	ae->ack = ntohl(th->th_ack);
16551ebf4607SRichard Scheffenegger 	ae->flags |= tcp_get_flags(th);
16569ca874cfSHans Petter Selasky 	if (ts_ptr != NULL) {
16579ca874cfSHans Petter Selasky 		ae->ts_value = ntohl(ts_ptr[1]);
16589ca874cfSHans Petter Selasky 		ae->ts_echo = ntohl(ts_ptr[2]);
165969a34e8dSRandall Stewart 		ae->flags |= HAS_TSTMP;
166069a34e8dSRandall Stewart 	}
166169a34e8dSRandall Stewart 	ae->win = ntohs(th->th_win);
166269a34e8dSRandall Stewart 	ae->codepoint = iptos;
166369a34e8dSRandall Stewart }
166469a34e8dSRandall Stewart 
166569a34e8dSRandall Stewart /*
16669ca874cfSHans Petter Selasky  * Do BPF tap for either ACK_CMP packets or MBUF QUEUE type packets
16679ca874cfSHans Petter Selasky  * and strip all, but the IPv4/IPv6 header.
166869a34e8dSRandall Stewart  */
16699ca874cfSHans Petter Selasky static bool
16709ca874cfSHans Petter Selasky do_bpf_strip_and_compress(struct inpcb *inp, struct lro_ctrl *lc,
16719ca874cfSHans Petter Selasky     struct lro_entry *le, struct mbuf **pp, struct mbuf **cmp, struct mbuf **mv_to,
16724e0ce82bSRandall Stewart     bool *should_wake, bool bpf_req, bool lagg_bpf_req, struct ifnet *lagg_ifp, bool can_append_old_cmp)
16739ca874cfSHans Petter Selasky {
16749ca874cfSHans Petter Selasky 	union {
16759ca874cfSHans Petter Selasky 		void *ptr;
16769ca874cfSHans Petter Selasky 		struct ip *ip4;
16779ca874cfSHans Petter Selasky 		struct ip6_hdr *ip6;
16789ca874cfSHans Petter Selasky 	} l3;
16799ca874cfSHans Petter Selasky 	struct mbuf *m;
16809ca874cfSHans Petter Selasky 	struct mbuf *nm;
168169a34e8dSRandall Stewart 	struct tcphdr *th;
16829ca874cfSHans Petter Selasky 	struct tcp_ackent *ack_ent;
16839ca874cfSHans Petter Selasky 	uint32_t *ts_ptr;
16849ca874cfSHans Petter Selasky 	int32_t n_mbuf;
16859ca874cfSHans Petter Selasky 	bool other_opts, can_compress;
1686bb5cd80eSHans Petter Selasky 	uint8_t lro_type;
16879ca874cfSHans Petter Selasky 	uint16_t iptos;
16889ca874cfSHans Petter Selasky 	int tcp_hdr_offset;
16899ca874cfSHans Petter Selasky 	int idx;
169069a34e8dSRandall Stewart 
16919ca874cfSHans Petter Selasky 	/* Get current mbuf. */
16929ca874cfSHans Petter Selasky 	m = *pp;
169369a34e8dSRandall Stewart 
169469a34e8dSRandall Stewart 	/* Let the BPF see the packet */
16959ca874cfSHans Petter Selasky 	if (__predict_false(bpf_req))
169669a34e8dSRandall Stewart 		ETHER_BPF_MTAP(lc->ifp, m);
16979ca874cfSHans Petter Selasky 
16982c6ff1d6SAndrew Gallatin 	if (__predict_false(lagg_bpf_req))
16992c6ff1d6SAndrew Gallatin 		ETHER_BPF_MTAP(lagg_ifp, m);
17002c6ff1d6SAndrew Gallatin 
17019ca874cfSHans Petter Selasky 	tcp_hdr_offset = m->m_pkthdr.lro_tcp_h_off;
17029ca874cfSHans Petter Selasky 	lro_type = le->inner.data.lro_type;
17039ca874cfSHans Petter Selasky 	switch (lro_type) {
17049ca874cfSHans Petter Selasky 	case LRO_TYPE_NONE:
17059ca874cfSHans Petter Selasky 		lro_type = le->outer.data.lro_type;
17069ca874cfSHans Petter Selasky 		switch (lro_type) {
17079ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
17089ca874cfSHans Petter Selasky 			tcp_hdr_offset -= sizeof(*le->outer.ip4);
17099ca874cfSHans Petter Selasky 			m->m_pkthdr.lro_etype = ETHERTYPE_IP;
17109ca874cfSHans Petter Selasky 			break;
17119ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
17129ca874cfSHans Petter Selasky 			tcp_hdr_offset -= sizeof(*le->outer.ip6);
17139ca874cfSHans Petter Selasky 			m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
17149ca874cfSHans Petter Selasky 			break;
17159ca874cfSHans Petter Selasky 		default:
17169ca874cfSHans Petter Selasky 			goto compressed;
17179ca874cfSHans Petter Selasky 		}
17189ca874cfSHans Petter Selasky 		break;
17199ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
17209ca874cfSHans Petter Selasky 		tcp_hdr_offset -= sizeof(*le->outer.ip4);
17219ca874cfSHans Petter Selasky 		m->m_pkthdr.lro_etype = ETHERTYPE_IP;
17229ca874cfSHans Petter Selasky 		break;
17239ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
17249ca874cfSHans Petter Selasky 		tcp_hdr_offset -= sizeof(*le->outer.ip6);
17259ca874cfSHans Petter Selasky 		m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
17269ca874cfSHans Petter Selasky 		break;
17279ca874cfSHans Petter Selasky 	default:
17289ca874cfSHans Petter Selasky 		goto compressed;
17299ca874cfSHans Petter Selasky 	}
17309ca874cfSHans Petter Selasky 
17319ca874cfSHans Petter Selasky 	MPASS(tcp_hdr_offset >= 0);
17329ca874cfSHans Petter Selasky 
17339ca874cfSHans Petter Selasky 	m_adj(m, tcp_hdr_offset);
173469a34e8dSRandall Stewart 	m->m_flags |= M_LRO_EHDRSTRP;
17359ca874cfSHans Petter Selasky 	m->m_flags &= ~M_ACKCMP;
17369ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_h_off -= tcp_hdr_offset;
173769a34e8dSRandall Stewart 
17389ca874cfSHans Petter Selasky 	th = tcp_lro_get_th(m);
173969a34e8dSRandall Stewart 
17409ca874cfSHans Petter Selasky 	th->th_sum = 0;		/* TCP checksum is valid. */
174169a34e8dSRandall Stewart 
17429ca874cfSHans Petter Selasky 	/* Check if ACK can be compressed */
17439ca874cfSHans Petter Selasky 	can_compress = tcp_lro_ack_valid(m, th, &ts_ptr, &other_opts);
174469a34e8dSRandall Stewart 
17459ca874cfSHans Petter Selasky 	/* Now lets look at the should wake states */
17469ca874cfSHans Petter Selasky 	if ((other_opts == true) &&
17479ca874cfSHans Petter Selasky 	    ((inp->inp_flags2 & INP_DONT_SACK_QUEUE) == 0)) {
174869a34e8dSRandall Stewart 		/*
17499ca874cfSHans Petter Selasky 		 * If there are other options (SACK?) and the
17509ca874cfSHans Petter Selasky 		 * tcp endpoint has not expressly told us it does
17519ca874cfSHans Petter Selasky 		 * not care about SACKS, then we should wake up.
175269a34e8dSRandall Stewart 		 */
17539ca874cfSHans Petter Selasky 		*should_wake = true;
175469a34e8dSRandall Stewart 	}
17559ca874cfSHans Petter Selasky 	/* Is the ack compressable? */
17569ca874cfSHans Petter Selasky 	if (can_compress == false)
17579ca874cfSHans Petter Selasky 		goto done;
17589ca874cfSHans Petter Selasky 	/* Does the TCP endpoint support ACK compression? */
17599ca874cfSHans Petter Selasky 	if ((inp->inp_flags2 & INP_MBUF_ACKCMP) == 0)
17609ca874cfSHans Petter Selasky 		goto done;
17619ca874cfSHans Petter Selasky 
17629ca874cfSHans Petter Selasky 	/* Lets get the TOS/traffic class field */
17639ca874cfSHans Petter Selasky 	l3.ptr = mtod(m, void *);
17649ca874cfSHans Petter Selasky 	switch (lro_type) {
17659ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
17669ca874cfSHans Petter Selasky 		iptos = l3.ip4->ip_tos;
17679ca874cfSHans Petter Selasky 		break;
17689ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
17699ca874cfSHans Petter Selasky 		iptos = IPV6_TRAFFIC_CLASS(l3.ip6);
17709ca874cfSHans Petter Selasky 		break;
17719ca874cfSHans Petter Selasky 	default:
17729ca874cfSHans Petter Selasky 		iptos = 0;	/* Keep compiler happy. */
177369a34e8dSRandall Stewart 		break;
177469a34e8dSRandall Stewart 	}
17759ca874cfSHans Petter Selasky 	/* Now lets get space if we don't have some already */
17769ca874cfSHans Petter Selasky 	if (*cmp == NULL) {
17779ca874cfSHans Petter Selasky new_one:
17784e0ce82bSRandall Stewart 		nm = tcp_lro_get_last_if_ackcmp(lc, le, inp, &n_mbuf, can_append_old_cmp);
17799ca874cfSHans Petter Selasky 		if (__predict_false(nm == NULL))
17809ca874cfSHans Petter Selasky 			goto done;
17819ca874cfSHans Petter Selasky 		*cmp = nm;
17829ca874cfSHans Petter Selasky 		if (n_mbuf) {
178369a34e8dSRandall Stewart 			/*
17849ca874cfSHans Petter Selasky 			 *  Link in the new cmp ack to our in-order place,
17859ca874cfSHans Petter Selasky 			 * first set our cmp ack's next to where we are.
178669a34e8dSRandall Stewart 			 */
17879ca874cfSHans Petter Selasky 			nm->m_nextpkt = m;
17889ca874cfSHans Petter Selasky 			(*pp) = nm;
17899ca874cfSHans Petter Selasky 			/*
17909ca874cfSHans Petter Selasky 			 * Set it up so mv_to is advanced to our
17919ca874cfSHans Petter Selasky 			 * compressed ack. This way the caller can
17929ca874cfSHans Petter Selasky 			 * advance pp to the right place.
17939ca874cfSHans Petter Selasky 			 */
17949ca874cfSHans Petter Selasky 			*mv_to = nm;
17959ca874cfSHans Petter Selasky 			/*
17969ca874cfSHans Petter Selasky 			 * Advance it here locally as well.
17979ca874cfSHans Petter Selasky 			 */
17989ca874cfSHans Petter Selasky 			pp = &nm->m_nextpkt;
179969a34e8dSRandall Stewart 		}
18009ca874cfSHans Petter Selasky 	} else {
18019ca874cfSHans Petter Selasky 		/* We have one already we are working on */
18029ca874cfSHans Petter Selasky 		nm = *cmp;
18039ca874cfSHans Petter Selasky 		if (M_TRAILINGSPACE(nm) < sizeof(struct tcp_ackent)) {
18049ca874cfSHans Petter Selasky 			/* We ran out of space */
18059ca874cfSHans Petter Selasky 			inp->inp_flags2 |= INP_MBUF_L_ACKS;
18069ca874cfSHans Petter Selasky 			goto new_one;
18079ca874cfSHans Petter Selasky 		}
18089ca874cfSHans Petter Selasky 	}
18099ca874cfSHans Petter Selasky 	MPASS(M_TRAILINGSPACE(nm) >= sizeof(struct tcp_ackent));
18109ca874cfSHans Petter Selasky 	counter_u64_add(tcp_inp_lro_compressed, 1);
18119ca874cfSHans Petter Selasky 	le->compressed++;
18129ca874cfSHans Petter Selasky 	/* We can add in to the one on the tail */
18139ca874cfSHans Petter Selasky 	ack_ent = mtod(nm, struct tcp_ackent *);
18149ca874cfSHans Petter Selasky 	idx = (nm->m_len / sizeof(struct tcp_ackent));
18159ca874cfSHans Petter Selasky 	build_ack_entry(&ack_ent[idx], th, m, ts_ptr, iptos);
181669a34e8dSRandall Stewart 
18179ca874cfSHans Petter Selasky 	/* Bump the size of both pkt-hdr and len */
18189ca874cfSHans Petter Selasky 	nm->m_len += sizeof(struct tcp_ackent);
18199ca874cfSHans Petter Selasky 	nm->m_pkthdr.len += sizeof(struct tcp_ackent);
18209ca874cfSHans Petter Selasky compressed:
18219ca874cfSHans Petter Selasky 	/* Advance to next mbuf before freeing. */
18229ca874cfSHans Petter Selasky 	*pp = m->m_nextpkt;
18239ca874cfSHans Petter Selasky 	m->m_nextpkt = NULL;
182469a34e8dSRandall Stewart 	m_freem(m);
18259ca874cfSHans Petter Selasky 	return (true);
18269ca874cfSHans Petter Selasky done:
18279ca874cfSHans Petter Selasky 	counter_u64_add(tcp_uncomp_total, 1);
18289ca874cfSHans Petter Selasky 	le->uncompressed++;
18299ca874cfSHans Petter Selasky 	return (false);
183069a34e8dSRandall Stewart }
183169a34e8dSRandall Stewart #endif
18329ca874cfSHans Petter Selasky 
18339ca874cfSHans Petter Selasky static struct lro_head *
18349ca874cfSHans Petter Selasky tcp_lro_rx_get_bucket(struct lro_ctrl *lc, struct mbuf *m, struct lro_parser *parser)
18359ca874cfSHans Petter Selasky {
18369ca874cfSHans Petter Selasky 	u_long hash;
18379ca874cfSHans Petter Selasky 
18389ca874cfSHans Petter Selasky 	if (M_HASHTYPE_ISHASH(m)) {
18399ca874cfSHans Petter Selasky 		hash = m->m_pkthdr.flowid;
18409ca874cfSHans Petter Selasky 	} else {
18419ca874cfSHans Petter Selasky 		for (unsigned i = hash = 0; i != LRO_RAW_ADDRESS_MAX; i++)
18429ca874cfSHans Petter Selasky 			hash += parser->data.raw[i];
184369a34e8dSRandall Stewart 	}
18449ca874cfSHans Petter Selasky 	return (&lc->lro_hash[hash % lc->lro_hashsz]);
18459ca874cfSHans Petter Selasky }
184669a34e8dSRandall Stewart 
184705cde7efSSepherosa Ziehau static int
18489ca874cfSHans Petter Selasky tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum, bool use_hash)
184962b5b6ecSBjoern A. Zeeb {
18509ca874cfSHans Petter Selasky 	struct lro_parser pi;	/* inner address data */
18519ca874cfSHans Petter Selasky 	struct lro_parser po;	/* outer address data */
18529ca874cfSHans Petter Selasky 	struct lro_parser *pa;	/* current parser for TCP stream */
185362b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
185405cde7efSSepherosa Ziehau 	struct lro_head *bucket;
18559ca874cfSHans Petter Selasky 	struct tcphdr *th;
18569ca874cfSHans Petter Selasky 	int tcp_data_len;
18579ca874cfSHans Petter Selasky 	int tcp_opt_len;
18589ca874cfSHans Petter Selasky 	int error;
18599ca874cfSHans Petter Selasky 	uint16_t tcp_data_sum;
18606c5087a8SJack F Vogel 
18619ca874cfSHans Petter Selasky #ifdef INET
18629ca874cfSHans Petter Selasky 	/* Quickly decide if packet cannot be LRO'ed */
18639ca874cfSHans Petter Selasky 	if (__predict_false(V_ipforwarding != 0))
18649ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
18659ca874cfSHans Petter Selasky #endif
18669ca874cfSHans Petter Selasky #ifdef INET6
18679ca874cfSHans Petter Selasky 	/* Quickly decide if packet cannot be LRO'ed */
18689ca874cfSHans Petter Selasky 	if (__predict_false(V_ip6_forwarding != 0))
18699ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
18709ca874cfSHans Petter Selasky #endif
1871ca1a7e10SRandall Stewart 	if (((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) !=
1872ca1a7e10SRandall Stewart 	     ((CSUM_DATA_VALID | CSUM_PSEUDO_HDR))) ||
1873ca1a7e10SRandall Stewart 	    (m->m_pkthdr.csum_data != 0xffff)) {
1874ca1a7e10SRandall Stewart 		/*
1875ca1a7e10SRandall Stewart 		 * The checksum either did not have hardware offload
1876ca1a7e10SRandall Stewart 		 * or it was a bad checksum. We can't LRO such
1877ca1a7e10SRandall Stewart 		 * a packet.
1878ca1a7e10SRandall Stewart 		 */
1879ca1a7e10SRandall Stewart 		counter_u64_add(tcp_bad_csums, 1);
1880ca1a7e10SRandall Stewart 		return (TCP_LRO_CANNOT);
1881ca1a7e10SRandall Stewart 	}
188262b5b6ecSBjoern A. Zeeb 	/* We expect a contiguous header [eh, ip, tcp]. */
18839ca874cfSHans Petter Selasky 	pa = tcp_lro_parser(m, &po, &pi, true);
18849ca874cfSHans Petter Selasky 	if (__predict_false(pa == NULL))
18859ca874cfSHans Petter Selasky 		return (TCP_LRO_NOT_SUPPORTED);
18869ca874cfSHans Petter Selasky 
18879ca874cfSHans Petter Selasky 	/* We don't expect any padding. */
18889ca874cfSHans Petter Selasky 	error = tcp_lro_trim_mbuf_chain(m, pa);
18899ca874cfSHans Petter Selasky 	if (__predict_false(error != 0))
18909ca874cfSHans Petter Selasky 		return (error);
18919ca874cfSHans Petter Selasky 
18929ca874cfSHans Petter Selasky #ifdef INET
18939ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
18949ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
18959ca874cfSHans Petter Selasky 		error = tcp_lro_rx_ipv4(lc, m, pa->ip4);
18969ca874cfSHans Petter Selasky 		if (__predict_false(error != 0))
18979ca874cfSHans Petter Selasky 			return (error);
18989ca874cfSHans Petter Selasky 		break;
18999ca874cfSHans Petter Selasky 	default:
19009ca874cfSHans Petter Selasky 		break;
19019ca874cfSHans Petter Selasky 	}
19029ca874cfSHans Petter Selasky #endif
19039ca874cfSHans Petter Selasky 	/* If no hardware or arrival stamp on the packet add timestamp */
1904e57b2d0eSRandall Stewart 	if ((m->m_flags & (M_TSTMP_LRO | M_TSTMP)) == 0) {
1905b45daaeaSRandall Stewart 		m->m_pkthdr.rcv_tstmp = bintime2ns(&lc->lro_last_queue_time);
1906e57b2d0eSRandall Stewart 		m->m_flags |= M_TSTMP_LRO;
1907e57b2d0eSRandall Stewart 	}
19086c5087a8SJack F Vogel 
19099ca874cfSHans Petter Selasky 	/* Get pointer to TCP header. */
19109ca874cfSHans Petter Selasky 	th = pa->tcp;
19119ca874cfSHans Petter Selasky 
19129ca874cfSHans Petter Selasky 	/* Don't process SYN packets. */
19131ebf4607SRichard Scheffenegger 	if (__predict_false(tcp_get_flags(th) & TH_SYN))
191462b5b6ecSBjoern A. Zeeb 		return (TCP_LRO_CANNOT);
191562b5b6ecSBjoern A. Zeeb 
19169ca874cfSHans Petter Selasky 	/* Get total TCP header length and compute payload length. */
19179ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
19189ca874cfSHans Petter Selasky 	tcp_data_len = m->m_pkthdr.len - ((uint8_t *)th -
19199ca874cfSHans Petter Selasky 	    (uint8_t *)m->m_data) - tcp_opt_len;
19209ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
19219ca874cfSHans Petter Selasky 
19229ca874cfSHans Petter Selasky 	/* Don't process invalid TCP headers. */
19239ca874cfSHans Petter Selasky 	if (__predict_false(tcp_opt_len < 0 || tcp_data_len < 0))
192462b5b6ecSBjoern A. Zeeb 		return (TCP_LRO_CANNOT);
19259ca874cfSHans Petter Selasky 
19269ca874cfSHans Petter Selasky 	/* Compute TCP data only checksum. */
19279ca874cfSHans Petter Selasky 	if (tcp_data_len == 0)
19289ca874cfSHans Petter Selasky 		tcp_data_sum = 0;	/* no data, no checksum */
19299ca874cfSHans Petter Selasky 	else if (__predict_false(csum != 0))
19309ca874cfSHans Petter Selasky 		tcp_data_sum = tcp_lro_rx_csum_data(pa, ~csum);
19319ca874cfSHans Petter Selasky 	else
19329ca874cfSHans Petter Selasky 		tcp_data_sum = tcp_lro_rx_csum_data(pa, ~th->th_sum);
19339ca874cfSHans Petter Selasky 
19349ca874cfSHans Petter Selasky 	/* Save TCP info in mbuf. */
19359ca874cfSHans Petter Selasky 	m->m_nextpkt = NULL;
19369ca874cfSHans Petter Selasky 	m->m_pkthdr.rcvif = lc->ifp;
19379ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_csum = tcp_data_sum;
19389ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_len = tcp_data_len;
19399ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_h_off = ((uint8_t *)th - (uint8_t *)m->m_data);
19409ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_nsegs = 1;
19419ca874cfSHans Petter Selasky 
19429ca874cfSHans Petter Selasky 	/* Get hash bucket. */
194305cde7efSSepherosa Ziehau 	if (!use_hash) {
194405cde7efSSepherosa Ziehau 		bucket = &lc->lro_hash[0];
194505cde7efSSepherosa Ziehau 	} else {
19469ca874cfSHans Petter Selasky 		bucket = tcp_lro_rx_get_bucket(lc, m, pa);
194705cde7efSSepherosa Ziehau 	}
194805cde7efSSepherosa Ziehau 
194962b5b6ecSBjoern A. Zeeb 	/* Try to find a matching previous segment. */
195005cde7efSSepherosa Ziehau 	LIST_FOREACH(le, bucket, hash_next) {
19519ca874cfSHans Petter Selasky 		/* Compare addresses and ports. */
19529ca874cfSHans Petter Selasky 		if (lro_address_compare(&po.data, &le->outer.data) == false ||
19539ca874cfSHans Petter Selasky 		    lro_address_compare(&pi.data, &le->inner.data) == false)
195462b5b6ecSBjoern A. Zeeb 			continue;
19559ca874cfSHans Petter Selasky 
19569ca874cfSHans Petter Selasky 		/* Check if no data and old ACK. */
19579ca874cfSHans Petter Selasky 		if (tcp_data_len == 0 &&
19589ca874cfSHans Petter Selasky 		    SEQ_LT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
1959d7fb35d1SSean Bruno 			m_freem(m);
1960d7fb35d1SSean Bruno 			return (0);
1961d7fb35d1SSean Bruno 		}
196269a34e8dSRandall Stewart 
19639ca874cfSHans Petter Selasky 		/* Mark "m" in the last spot. */
1964e57b2d0eSRandall Stewart 		le->m_last_mbuf->m_nextpkt = m;
19659ca874cfSHans Petter Selasky 		/* Now set the tail to "m". */
1966e57b2d0eSRandall Stewart 		le->m_last_mbuf = m;
196762b5b6ecSBjoern A. Zeeb 		return (0);
19686c5087a8SJack F Vogel 	}
19699ca874cfSHans Petter Selasky 
197062b5b6ecSBjoern A. Zeeb 	/* Try to find an empty slot. */
19711ea44822SSepherosa Ziehau 	if (LIST_EMPTY(&lc->lro_free))
1972489f0c3cSSepherosa Ziehau 		return (TCP_LRO_NO_ENTRIES);
197362b5b6ecSBjoern A. Zeeb 
197462b5b6ecSBjoern A. Zeeb 	/* Start a new segment chain. */
19751ea44822SSepherosa Ziehau 	le = LIST_FIRST(&lc->lro_free);
19761ea44822SSepherosa Ziehau 	LIST_REMOVE(le, next);
197705cde7efSSepherosa Ziehau 	tcp_lro_active_insert(lc, bucket, le);
197862b5b6ecSBjoern A. Zeeb 
19799ca874cfSHans Petter Selasky 	/* Make sure the headers are set. */
19809ca874cfSHans Petter Selasky 	le->inner = pi;
19819ca874cfSHans Petter Selasky 	le->outer = po;
198262b5b6ecSBjoern A. Zeeb 
19839ca874cfSHans Petter Selasky 	/* Store time this entry was allocated. */
19849ca874cfSHans Petter Selasky 	le->alloc_time = lc->lro_last_queue_time;
198569a34e8dSRandall Stewart 
19869ca874cfSHans Petter Selasky 	tcp_set_entry_to_mbuf(lc, le, m, th);
198769a34e8dSRandall Stewart 
19889ca874cfSHans Petter Selasky 	/* Now set the tail to "m". */
1989e57b2d0eSRandall Stewart 	le->m_last_mbuf = m;
19909ca874cfSHans Petter Selasky 
199162b5b6ecSBjoern A. Zeeb 	return (0);
199262b5b6ecSBjoern A. Zeeb }
199362b5b6ecSBjoern A. Zeeb 
199405cde7efSSepherosa Ziehau int
199505cde7efSSepherosa Ziehau tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum)
199605cde7efSSepherosa Ziehau {
19979ca874cfSHans Petter Selasky 	int error;
199805cde7efSSepherosa Ziehau 
1999ca1a7e10SRandall Stewart 	if (((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) !=
2000ca1a7e10SRandall Stewart 	     ((CSUM_DATA_VALID | CSUM_PSEUDO_HDR))) ||
2001ca1a7e10SRandall Stewart 	    (m->m_pkthdr.csum_data != 0xffff)) {
2002ca1a7e10SRandall Stewart 		/*
2003ca1a7e10SRandall Stewart 		 * The checksum either did not have hardware offload
2004ca1a7e10SRandall Stewart 		 * or it was a bad checksum. We can't LRO such
2005ca1a7e10SRandall Stewart 		 * a packet.
2006ca1a7e10SRandall Stewart 		 */
2007ca1a7e10SRandall Stewart 		counter_u64_add(tcp_bad_csums, 1);
2008ca1a7e10SRandall Stewart 		return (TCP_LRO_CANNOT);
2009ca1a7e10SRandall Stewart 	}
20109ca874cfSHans Petter Selasky 	/* get current time */
2011b45daaeaSRandall Stewart 	binuptime(&lc->lro_last_queue_time);
20129ca874cfSHans Petter Selasky 	CURVNET_SET(lc->ifp->if_vnet);
20139ca874cfSHans Petter Selasky 	error = tcp_lro_rx_common(lc, m, csum, true);
20144e0ce82bSRandall Stewart 	if (__predict_false(error != 0)) {
20154e0ce82bSRandall Stewart 		/*
20164e0ce82bSRandall Stewart 		 * Flush anything we have acummulated
20174e0ce82bSRandall Stewart 		 * ahead of this packet that can't
20184e0ce82bSRandall Stewart 		 * be LRO'd. This preserves order.
20194e0ce82bSRandall Stewart 		 */
20204e0ce82bSRandall Stewart 		tcp_lro_flush_active(lc);
20214e0ce82bSRandall Stewart 	}
20229ca874cfSHans Petter Selasky 	CURVNET_RESTORE();
20239ca874cfSHans Petter Selasky 
20249ca874cfSHans Petter Selasky 	return (error);
202505cde7efSSepherosa Ziehau }
202605cde7efSSepherosa Ziehau 
2027e936121dSHans Petter Selasky void
2028e936121dSHans Petter Selasky tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb)
2029e936121dSHans Petter Selasky {
2030dc6ab77dSMichael Tuexen 	NET_EPOCH_ASSERT();
2031e936121dSHans Petter Selasky 	/* sanity checks */
2032e936121dSHans Petter Selasky 	if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL ||
2033e936121dSHans Petter Selasky 	    lc->lro_mbuf_max == 0)) {
2034e936121dSHans Petter Selasky 		/* packet drop */
2035e936121dSHans Petter Selasky 		m_freem(mb);
2036e936121dSHans Petter Selasky 		return;
2037e936121dSHans Petter Selasky 	}
2038e936121dSHans Petter Selasky 
2039e936121dSHans Petter Selasky 	/* check if packet is not LRO capable */
2040ca1a7e10SRandall Stewart 	if (__predict_false((lc->ifp->if_capenable & IFCAP_LRO) == 0)) {
2041e936121dSHans Petter Selasky 		/* input packet to network layer */
2042e936121dSHans Petter Selasky 		(*lc->ifp->if_input) (lc->ifp, mb);
2043e936121dSHans Petter Selasky 		return;
2044e936121dSHans Petter Selasky 	}
2045e936121dSHans Petter Selasky 
20464e0ce82bSRandall Stewart  	/* If no hardware or arrival stamp on the packet add timestamp */
20474e0ce82bSRandall Stewart  	if ((tcplro_stacks_wanting_mbufq > 0) &&
20484e0ce82bSRandall Stewart  	    (tcp_less_accurate_lro_ts == 0) &&
20494e0ce82bSRandall Stewart  	    ((mb->m_flags & M_TSTMP) == 0)) {
20504e0ce82bSRandall Stewart  		/* Add in an LRO time since no hardware */
20514e0ce82bSRandall Stewart  		binuptime(&lc->lro_last_queue_time);
20524e0ce82bSRandall Stewart  		mb->m_pkthdr.rcv_tstmp = bintime2ns(&lc->lro_last_queue_time);
20534e0ce82bSRandall Stewart  		mb->m_flags |= M_TSTMP_LRO;
20544e0ce82bSRandall Stewart  	}
20554e0ce82bSRandall Stewart 
2056fc271df3SHans Petter Selasky 	/* create sequence number */
2057fc271df3SHans Petter Selasky 	lc->lro_mbuf_data[lc->lro_mbuf_count].seq =
2058fc271df3SHans Petter Selasky 	    (((uint64_t)M_HASHTYPE_GET(mb)) << 56) |
2059fc271df3SHans Petter Selasky 	    (((uint64_t)mb->m_pkthdr.flowid) << 24) |
2060fc271df3SHans Petter Selasky 	    ((uint64_t)lc->lro_mbuf_count);
2061e936121dSHans Petter Selasky 
2062e936121dSHans Petter Selasky 	/* enter mbuf */
2063f8acc03eSNavdeep Parhar 	lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb;
2064f8acc03eSNavdeep Parhar 
2065f8acc03eSNavdeep Parhar 	/* flush if array is full */
2066f8acc03eSNavdeep Parhar 	if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max))
2067f8acc03eSNavdeep Parhar 		tcp_lro_flush_all(lc);
2068e936121dSHans Petter Selasky }
2069e936121dSHans Petter Selasky 
207062b5b6ecSBjoern A. Zeeb /* end */
2071