xref: /freebsd/sys/netinet/tcp_lro.c (revision b45daaea95abd8bda52caaacf120f9197caab3e7)
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>
566c5087a8SJack F Vogel 
576c5087a8SJack F Vogel #include <netinet/in_systm.h>
586c5087a8SJack F Vogel #include <netinet/in.h>
5962b5b6ecSBjoern A. Zeeb #include <netinet/ip6.h>
606c5087a8SJack F Vogel #include <netinet/ip.h>
6131bfc56eSBjoern A. Zeeb #include <netinet/ip_var.h>
62e57b2d0eSRandall Stewart #include <netinet/in_pcb.h>
63e57b2d0eSRandall Stewart #include <netinet6/in6_pcb.h>
646c5087a8SJack F Vogel #include <netinet/tcp.h>
65d7fb35d1SSean Bruno #include <netinet/tcp_seq.h>
666c5087a8SJack F Vogel #include <netinet/tcp_lro.h>
678452c1b3SSepherosa Ziehau #include <netinet/tcp_var.h>
6869a34e8dSRandall Stewart #include <netinet/tcpip.h>
69e57b2d0eSRandall Stewart #include <netinet/tcp_hpts.h>
70e57b2d0eSRandall Stewart #include <netinet/tcp_log_buf.h>
719ca874cfSHans Petter Selasky #include <netinet/udp.h>
7231bfc56eSBjoern A. Zeeb #include <netinet6/ip6_var.h>
7331bfc56eSBjoern A. Zeeb 
746c5087a8SJack F Vogel #include <machine/in_cksum.h>
756c5087a8SJack F Vogel 
76e936121dSHans Petter Selasky static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures");
776c5087a8SJack F Vogel 
789ca874cfSHans Petter Selasky #define	TCP_LRO_TS_OPTION \
799ca874cfSHans Petter Selasky     ntohl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | \
809ca874cfSHans Petter Selasky 	  (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)
816c5087a8SJack F Vogel 
826dd38b87SSepherosa Ziehau static void	tcp_lro_rx_done(struct lro_ctrl *lc);
839ca874cfSHans Petter Selasky static int	tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m,
849ca874cfSHans Petter Selasky 		    uint32_t csum, bool use_hash);
859ca874cfSHans Petter Selasky 
869ca874cfSHans Petter Selasky #ifdef TCPHPTS
879ca874cfSHans Petter Selasky static bool	do_bpf_strip_and_compress(struct inpcb *, struct lro_ctrl *,
889ca874cfSHans Petter Selasky 		struct lro_entry *, struct mbuf **, struct mbuf **, struct mbuf **, bool *, bool);
899ca874cfSHans Petter Selasky 
909ca874cfSHans Petter Selasky #endif
916dd38b87SSepherosa Ziehau 
928452c1b3SSepherosa Ziehau SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro,  CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
938452c1b3SSepherosa Ziehau     "TCP LRO");
948452c1b3SSepherosa Ziehau 
959ca874cfSHans Petter Selasky static long tcplro_stacks_wanting_mbufq;
96e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_direct_queue;
97e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_wokeup_queue;
98e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_compressed;
99e57b2d0eSRandall Stewart counter_u64_t tcp_inp_lro_locks_taken;
10069a34e8dSRandall Stewart counter_u64_t tcp_extra_mbuf;
10169a34e8dSRandall Stewart counter_u64_t tcp_would_have_but;
10269a34e8dSRandall Stewart counter_u64_t tcp_comp_total;
10369a34e8dSRandall Stewart counter_u64_t tcp_uncomp_total;
104e57b2d0eSRandall Stewart 
1058452c1b3SSepherosa Ziehau static unsigned	tcp_lro_entries = TCP_LRO_ENTRIES;
1068452c1b3SSepherosa Ziehau SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries,
1078452c1b3SSepherosa Ziehau     CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_entries, 0,
1088452c1b3SSepherosa Ziehau     "default number of LRO entries");
10969a34e8dSRandall Stewart 
110e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, fullqueue, CTLFLAG_RD,
111e57b2d0eSRandall Stewart     &tcp_inp_lro_direct_queue, "Number of lro's fully queued to transport");
112e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, wokeup, CTLFLAG_RD,
113e57b2d0eSRandall Stewart     &tcp_inp_lro_wokeup_queue, "Number of lro's where we woke up transport via hpts");
114e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, compressed, CTLFLAG_RD,
115e57b2d0eSRandall Stewart     &tcp_inp_lro_compressed, "Number of lro's compressed and sent to transport");
116e57b2d0eSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lockcnt, CTLFLAG_RD,
117e57b2d0eSRandall Stewart     &tcp_inp_lro_locks_taken, "Number of lro's inp_wlocks taken");
11869a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, extra_mbuf, CTLFLAG_RD,
11969a34e8dSRandall Stewart     &tcp_extra_mbuf, "Number of times we had an extra compressed ack dropped into the tp");
12069a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, would_have_but, CTLFLAG_RD,
1219ca874cfSHans Petter Selasky     &tcp_would_have_but, "Number of times we would have had an extra compressed, but mget failed");
12269a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, with_m_ackcmp, CTLFLAG_RD,
12369a34e8dSRandall Stewart     &tcp_comp_total, "Number of mbufs queued with M_ACKCMP flags set");
12469a34e8dSRandall Stewart SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, without_m_ackcmp, CTLFLAG_RD,
12569a34e8dSRandall Stewart     &tcp_uncomp_total, "Number of mbufs queued without M_ACKCMP");
126e57b2d0eSRandall Stewart 
127e57b2d0eSRandall Stewart void
128e57b2d0eSRandall Stewart tcp_lro_reg_mbufq(void)
129e57b2d0eSRandall Stewart {
130e57b2d0eSRandall Stewart 	atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, 1);
131e57b2d0eSRandall Stewart }
132e57b2d0eSRandall Stewart 
133e57b2d0eSRandall Stewart void
134e57b2d0eSRandall Stewart tcp_lro_dereg_mbufq(void)
135e57b2d0eSRandall Stewart {
136e57b2d0eSRandall Stewart 	atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, -1);
137e57b2d0eSRandall Stewart }
1388452c1b3SSepherosa Ziehau 
13951e3c20dSSepherosa Ziehau static __inline void
14005cde7efSSepherosa Ziehau tcp_lro_active_insert(struct lro_ctrl *lc, struct lro_head *bucket,
14105cde7efSSepherosa Ziehau     struct lro_entry *le)
14251e3c20dSSepherosa Ziehau {
14351e3c20dSSepherosa Ziehau 
14451e3c20dSSepherosa Ziehau 	LIST_INSERT_HEAD(&lc->lro_active, le, next);
14505cde7efSSepherosa Ziehau 	LIST_INSERT_HEAD(bucket, le, hash_next);
14651e3c20dSSepherosa Ziehau }
14751e3c20dSSepherosa Ziehau 
14851e3c20dSSepherosa Ziehau static __inline void
14951e3c20dSSepherosa Ziehau tcp_lro_active_remove(struct lro_entry *le)
15051e3c20dSSepherosa Ziehau {
15151e3c20dSSepherosa Ziehau 
15205cde7efSSepherosa Ziehau 	LIST_REMOVE(le, next);		/* active list */
15305cde7efSSepherosa Ziehau 	LIST_REMOVE(le, hash_next);	/* hash bucket */
15451e3c20dSSepherosa Ziehau }
15551e3c20dSSepherosa Ziehau 
1566c5087a8SJack F Vogel int
15762b5b6ecSBjoern A. Zeeb tcp_lro_init(struct lro_ctrl *lc)
1586c5087a8SJack F Vogel {
1598452c1b3SSepherosa Ziehau 	return (tcp_lro_init_args(lc, NULL, tcp_lro_entries, 0));
160e936121dSHans Petter Selasky }
161e936121dSHans Petter Selasky 
162e936121dSHans Petter Selasky int
163e936121dSHans Petter Selasky tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp,
164e936121dSHans Petter Selasky     unsigned lro_entries, unsigned lro_mbufs)
165e936121dSHans Petter Selasky {
16662b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
167e936121dSHans Petter Selasky 	size_t size;
16805cde7efSSepherosa Ziehau 	unsigned i, elements;
1696c5087a8SJack F Vogel 
17062b5b6ecSBjoern A. Zeeb 	lc->lro_bad_csum = 0;
17162b5b6ecSBjoern A. Zeeb 	lc->lro_queued = 0;
17262b5b6ecSBjoern A. Zeeb 	lc->lro_flushed = 0;
173e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
174e936121dSHans Petter Selasky 	lc->lro_mbuf_max = lro_mbufs;
175e936121dSHans Petter Selasky 	lc->lro_cnt = lro_entries;
1767ae3d4bfSSepherosa Ziehau 	lc->lro_ackcnt_lim = TCP_LRO_ACKCNT_MAX;
1777ae3d4bfSSepherosa Ziehau 	lc->lro_length_lim = TCP_LRO_LENGTH_MAX;
178e936121dSHans Petter Selasky 	lc->ifp = ifp;
1791ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_free);
1801ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_active);
1816c5087a8SJack F Vogel 
18205cde7efSSepherosa Ziehau 	/* create hash table to accelerate entry lookup */
18305cde7efSSepherosa Ziehau 	if (lro_entries > lro_mbufs)
18405cde7efSSepherosa Ziehau 		elements = lro_entries;
18505cde7efSSepherosa Ziehau 	else
18605cde7efSSepherosa Ziehau 		elements = lro_mbufs;
18705cde7efSSepherosa Ziehau 	lc->lro_hash = phashinit_flags(elements, M_LRO, &lc->lro_hashsz,
18805cde7efSSepherosa Ziehau 	    HASH_NOWAIT);
18905cde7efSSepherosa Ziehau 	if (lc->lro_hash == NULL) {
19005cde7efSSepherosa Ziehau 		memset(lc, 0, sizeof(*lc));
19105cde7efSSepherosa Ziehau 		return (ENOMEM);
19205cde7efSSepherosa Ziehau 	}
19305cde7efSSepherosa Ziehau 
194e936121dSHans Petter Selasky 	/* compute size to allocate */
195fc271df3SHans Petter Selasky 	size = (lro_mbufs * sizeof(struct lro_mbuf_sort)) +
196e936121dSHans Petter Selasky 	    (lro_entries * sizeof(*le));
197fc271df3SHans Petter Selasky 	lc->lro_mbuf_data = (struct lro_mbuf_sort *)
198e936121dSHans Petter Selasky 	    malloc(size, M_LRO, M_NOWAIT | M_ZERO);
1996c5087a8SJack F Vogel 
200e936121dSHans Petter Selasky 	/* check for out of memory */
201e936121dSHans Petter Selasky 	if (lc->lro_mbuf_data == NULL) {
202a3927369SNavdeep Parhar 		free(lc->lro_hash, M_LRO);
203e936121dSHans Petter Selasky 		memset(lc, 0, sizeof(*lc));
204e936121dSHans Petter Selasky 		return (ENOMEM);
205e936121dSHans Petter Selasky 	}
206e936121dSHans Petter Selasky 	/* compute offset for LRO entries */
207e936121dSHans Petter Selasky 	le = (struct lro_entry *)
208e936121dSHans Petter Selasky 	    (lc->lro_mbuf_data + lro_mbufs);
209e936121dSHans Petter Selasky 
210e936121dSHans Petter Selasky 	/* setup linked list */
211e936121dSHans Petter Selasky 	for (i = 0; i != lro_entries; i++)
2121ea44822SSepherosa Ziehau 		LIST_INSERT_HEAD(&lc->lro_free, le + i, next);
213e936121dSHans Petter Selasky 
214e936121dSHans Petter Selasky 	return (0);
2156c5087a8SJack F Vogel }
2166c5087a8SJack F Vogel 
2179ca874cfSHans Petter Selasky struct vxlan_header {
2189ca874cfSHans Petter Selasky 	uint32_t	vxlh_flags;
2199ca874cfSHans Petter Selasky 	uint32_t	vxlh_vni;
2209ca874cfSHans Petter Selasky };
221e57b2d0eSRandall Stewart 
2229ca874cfSHans Petter Selasky static inline void *
2239ca874cfSHans Petter Selasky tcp_lro_low_level_parser(void *ptr, struct lro_parser *parser, bool update_data, bool is_vxlan)
2249ca874cfSHans Petter Selasky {
2259ca874cfSHans Petter Selasky 	const struct ether_vlan_header *eh;
2269ca874cfSHans Petter Selasky 	void *old;
2279ca874cfSHans Petter Selasky 	uint16_t eth_type;
2289ca874cfSHans Petter Selasky 
2299ca874cfSHans Petter Selasky 	if (update_data)
2309ca874cfSHans Petter Selasky 		memset(parser, 0, sizeof(*parser));
2319ca874cfSHans Petter Selasky 
2329ca874cfSHans Petter Selasky 	old = ptr;
2339ca874cfSHans Petter Selasky 
2349ca874cfSHans Petter Selasky 	if (is_vxlan) {
2359ca874cfSHans Petter Selasky 		const struct vxlan_header *vxh;
2369ca874cfSHans Petter Selasky 		vxh = ptr;
2379ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + sizeof(*vxh);
2389ca874cfSHans Petter Selasky 		if (update_data) {
2399ca874cfSHans Petter Selasky 			parser->data.vxlan_vni =
2409ca874cfSHans Petter Selasky 			    vxh->vxlh_vni & htonl(0xffffff00);
241e57b2d0eSRandall Stewart 		}
2429ca874cfSHans Petter Selasky 	}
2439ca874cfSHans Petter Selasky 
2449ca874cfSHans Petter Selasky 	eh = ptr;
2459ca874cfSHans Petter Selasky 	if (__predict_false(eh->evl_encap_proto == htons(ETHERTYPE_VLAN))) {
2469ca874cfSHans Petter Selasky 		eth_type = eh->evl_proto;
2479ca874cfSHans Petter Selasky 		if (update_data) {
2489ca874cfSHans Petter Selasky 			/* strip priority and keep VLAN ID only */
2499ca874cfSHans Petter Selasky 			parser->data.vlan_id = eh->evl_tag & htons(EVL_VLID_MASK);
2509ca874cfSHans Petter Selasky 		}
2519ca874cfSHans Petter Selasky 		/* advance to next header */
2529ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
2539ca874cfSHans Petter Selasky 	} else {
2549ca874cfSHans Petter Selasky 		eth_type = eh->evl_encap_proto;
2559ca874cfSHans Petter Selasky 		/* advance to next header */
2569ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + ETHER_HDR_LEN;
2579ca874cfSHans Petter Selasky 	}
2589ca874cfSHans Petter Selasky 
2599ca874cfSHans Petter Selasky 	switch (eth_type) {
2609ca874cfSHans Petter Selasky #ifdef INET
2619ca874cfSHans Petter Selasky 	case htons(ETHERTYPE_IP):
2629ca874cfSHans Petter Selasky 		parser->ip4 = ptr;
2639ca874cfSHans Petter Selasky 		/* Ensure there are no IPv4 options. */
2649ca874cfSHans Petter Selasky 		if ((parser->ip4->ip_hl << 2) != sizeof (*parser->ip4))
2659ca874cfSHans Petter Selasky 			break;
2669ca874cfSHans Petter Selasky 		/* .. and the packet is not fragmented. */
2679ca874cfSHans Petter Selasky 		if (parser->ip4->ip_off & htons(IP_MF|IP_OFFMASK))
2689ca874cfSHans Petter Selasky 			break;
2699ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + (parser->ip4->ip_hl << 2);
2709ca874cfSHans Petter Selasky 		if (update_data) {
2719ca874cfSHans Petter Selasky 			parser->data.s_addr.v4 = parser->ip4->ip_src;
2729ca874cfSHans Petter Selasky 			parser->data.d_addr.v4 = parser->ip4->ip_dst;
2739ca874cfSHans Petter Selasky 		}
2749ca874cfSHans Petter Selasky 		switch (parser->ip4->ip_p) {
2759ca874cfSHans Petter Selasky 		case IPPROTO_UDP:
2769ca874cfSHans Petter Selasky 			parser->udp = ptr;
2779ca874cfSHans Petter Selasky 			if (update_data) {
2789ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV4_UDP;
2799ca874cfSHans Petter Selasky 				parser->data.s_port = parser->udp->uh_sport;
2809ca874cfSHans Petter Selasky 				parser->data.d_port = parser->udp->uh_dport;
2819ca874cfSHans Petter Selasky 			} else {
2829ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV4_UDP);
2839ca874cfSHans Petter Selasky 			}
2849ca874cfSHans Petter Selasky 			ptr = ((uint8_t *)ptr + sizeof(*parser->udp));
2859ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
2869ca874cfSHans Petter Selasky 			return (ptr);
2879ca874cfSHans Petter Selasky 		case IPPROTO_TCP:
2889ca874cfSHans Petter Selasky 			parser->tcp = ptr;
2899ca874cfSHans Petter Selasky 			if (update_data) {
2909ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV4_TCP;
2919ca874cfSHans Petter Selasky 				parser->data.s_port = parser->tcp->th_sport;
2929ca874cfSHans Petter Selasky 				parser->data.d_port = parser->tcp->th_dport;
2939ca874cfSHans Petter Selasky 			} else {
2949ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV4_TCP);
2959ca874cfSHans Petter Selasky 			}
2969ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2);
2979ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
2989ca874cfSHans Petter Selasky 			return (ptr);
2999ca874cfSHans Petter Selasky 		default:
3009ca874cfSHans Petter Selasky 			break;
3019ca874cfSHans Petter Selasky 		}
3029ca874cfSHans Petter Selasky 		break;
3039ca874cfSHans Petter Selasky #endif
3049ca874cfSHans Petter Selasky #ifdef INET6
3059ca874cfSHans Petter Selasky 	case htons(ETHERTYPE_IPV6):
3069ca874cfSHans Petter Selasky 		parser->ip6 = ptr;
3079ca874cfSHans Petter Selasky 		ptr = (uint8_t *)ptr + sizeof(*parser->ip6);
3089ca874cfSHans Petter Selasky 		if (update_data) {
3099ca874cfSHans Petter Selasky 			parser->data.s_addr.v6 = parser->ip6->ip6_src;
3109ca874cfSHans Petter Selasky 			parser->data.d_addr.v6 = parser->ip6->ip6_dst;
3119ca874cfSHans Petter Selasky 		}
3129ca874cfSHans Petter Selasky 		switch (parser->ip6->ip6_nxt) {
3139ca874cfSHans Petter Selasky 		case IPPROTO_UDP:
3149ca874cfSHans Petter Selasky 			parser->udp = ptr;
3159ca874cfSHans Petter Selasky 			if (update_data) {
3169ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV6_UDP;
3179ca874cfSHans Petter Selasky 				parser->data.s_port = parser->udp->uh_sport;
3189ca874cfSHans Petter Selasky 				parser->data.d_port = parser->udp->uh_dport;
3199ca874cfSHans Petter Selasky 			} else {
3209ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV6_UDP);
3219ca874cfSHans Petter Selasky 			}
3229ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + sizeof(*parser->udp);
3239ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3249ca874cfSHans Petter Selasky 			return (ptr);
3259ca874cfSHans Petter Selasky 		case IPPROTO_TCP:
3269ca874cfSHans Petter Selasky 			parser->tcp = ptr;
3279ca874cfSHans Petter Selasky 			if (update_data) {
3289ca874cfSHans Petter Selasky 				parser->data.lro_type = LRO_TYPE_IPV6_TCP;
3299ca874cfSHans Petter Selasky 				parser->data.s_port = parser->tcp->th_sport;
3309ca874cfSHans Petter Selasky 				parser->data.d_port = parser->tcp->th_dport;
3319ca874cfSHans Petter Selasky 			} else {
3329ca874cfSHans Petter Selasky 				MPASS(parser->data.lro_type == LRO_TYPE_IPV6_TCP);
3339ca874cfSHans Petter Selasky 			}
3349ca874cfSHans Petter Selasky 			ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2);
3359ca874cfSHans Petter Selasky 			parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old;
3369ca874cfSHans Petter Selasky 			return (ptr);
3379ca874cfSHans Petter Selasky 		default:
3389ca874cfSHans Petter Selasky 			break;
3399ca874cfSHans Petter Selasky 		}
3409ca874cfSHans Petter Selasky 		break;
3419ca874cfSHans Petter Selasky #endif
3429ca874cfSHans Petter Selasky 	default:
3439ca874cfSHans Petter Selasky 		break;
3449ca874cfSHans Petter Selasky 	}
3459ca874cfSHans Petter Selasky 	/* Invalid packet - cannot parse */
3469ca874cfSHans Petter Selasky 	return (NULL);
3479ca874cfSHans Petter Selasky }
3489ca874cfSHans Petter Selasky 
3499ca874cfSHans Petter Selasky static const int vxlan_csum = CSUM_INNER_L3_CALC | CSUM_INNER_L3_VALID |
3509ca874cfSHans Petter Selasky     CSUM_INNER_L4_CALC | CSUM_INNER_L4_VALID;
3519ca874cfSHans Petter Selasky 
3529ca874cfSHans Petter Selasky static inline struct lro_parser *
3539ca874cfSHans Petter Selasky tcp_lro_parser(struct mbuf *m, struct lro_parser *po, struct lro_parser *pi, bool update_data)
3549ca874cfSHans Petter Selasky {
3559ca874cfSHans Petter Selasky 	void *data_ptr;
3569ca874cfSHans Petter Selasky 
3579ca874cfSHans Petter Selasky 	/* Try to parse outer headers first. */
3589ca874cfSHans Petter Selasky 	data_ptr = tcp_lro_low_level_parser(m->m_data, po, update_data, false);
3599ca874cfSHans Petter Selasky 	if (data_ptr == NULL || po->total_hdr_len > m->m_len)
3609ca874cfSHans Petter Selasky 		return (NULL);
3619ca874cfSHans Petter Selasky 
3629ca874cfSHans Petter Selasky 	if (update_data) {
3639ca874cfSHans Petter Selasky 		/* Store VLAN ID, if any. */
3649ca874cfSHans Petter Selasky 		if (__predict_false(m->m_flags & M_VLANTAG)) {
3659ca874cfSHans Petter Selasky 			po->data.vlan_id =
3669ca874cfSHans Petter Selasky 			    htons(m->m_pkthdr.ether_vtag) & htons(EVL_VLID_MASK);
3679ca874cfSHans Petter Selasky 		}
3689ca874cfSHans Petter Selasky 	}
3699ca874cfSHans Petter Selasky 
3709ca874cfSHans Petter Selasky 	switch (po->data.lro_type) {
3719ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_UDP:
3729ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_UDP:
3739ca874cfSHans Petter Selasky 		/* Check for VXLAN headers. */
3749ca874cfSHans Petter Selasky 		if ((m->m_pkthdr.csum_flags & vxlan_csum) != vxlan_csum)
3759ca874cfSHans Petter Selasky 			break;
3769ca874cfSHans Petter Selasky 
3779ca874cfSHans Petter Selasky 		/* Try to parse inner headers. */
3789ca874cfSHans Petter Selasky 		data_ptr = tcp_lro_low_level_parser(data_ptr, pi, update_data, true);
3799ca874cfSHans Petter Selasky 		if (data_ptr == NULL || pi->total_hdr_len > m->m_len)
3809ca874cfSHans Petter Selasky 			break;
3819ca874cfSHans Petter Selasky 
3829ca874cfSHans Petter Selasky 		/* Verify supported header types. */
3839ca874cfSHans Petter Selasky 		switch (pi->data.lro_type) {
3849ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
3859ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
3869ca874cfSHans Petter Selasky 			return (pi);
3879ca874cfSHans Petter Selasky 		default:
3889ca874cfSHans Petter Selasky 			break;
3899ca874cfSHans Petter Selasky 		}
3909ca874cfSHans Petter Selasky 		break;
3919ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
3929ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
3939ca874cfSHans Petter Selasky 		if (update_data)
3949ca874cfSHans Petter Selasky 			memset(pi, 0, sizeof(*pi));
3959ca874cfSHans Petter Selasky 		return (po);
3969ca874cfSHans Petter Selasky 	default:
3979ca874cfSHans Petter Selasky 		break;
3989ca874cfSHans Petter Selasky 	}
3999ca874cfSHans Petter Selasky 	return (NULL);
4009ca874cfSHans Petter Selasky }
4019ca874cfSHans Petter Selasky 
4029ca874cfSHans Petter Selasky static inline int
4039ca874cfSHans Petter Selasky tcp_lro_trim_mbuf_chain(struct mbuf *m, const struct lro_parser *po)
4049ca874cfSHans Petter Selasky {
4059ca874cfSHans Petter Selasky 	int len;
4069ca874cfSHans Petter Selasky 
4079ca874cfSHans Petter Selasky 	switch (po->data.lro_type) {
4089ca874cfSHans Petter Selasky #ifdef INET
4099ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
4109ca874cfSHans Petter Selasky 		len = ((uint8_t *)po->ip4 - (uint8_t *)m->m_data) +
4119ca874cfSHans Petter Selasky 		    ntohs(po->ip4->ip_len);
4129ca874cfSHans Petter Selasky 		break;
4139ca874cfSHans Petter Selasky #endif
4149ca874cfSHans Petter Selasky #ifdef INET6
4159ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
4169ca874cfSHans Petter Selasky 		len = ((uint8_t *)po->ip6 - (uint8_t *)m->m_data) +
4179ca874cfSHans Petter Selasky 		    ntohs(po->ip6->ip6_plen) + sizeof(*po->ip6);
4189ca874cfSHans Petter Selasky 		break;
4199ca874cfSHans Petter Selasky #endif
4209ca874cfSHans Petter Selasky 	default:
4219ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
4229ca874cfSHans Petter Selasky 	}
4239ca874cfSHans Petter Selasky 
4249ca874cfSHans Petter Selasky 	/*
4259ca874cfSHans Petter Selasky 	 * If the frame is padded beyond the end of the IP packet,
4269ca874cfSHans Petter Selasky 	 * then trim the extra bytes off:
4279ca874cfSHans Petter Selasky 	 */
4289ca874cfSHans Petter Selasky 	if (__predict_true(m->m_pkthdr.len == len)) {
4299ca874cfSHans Petter Selasky 		return (0);
4309ca874cfSHans Petter Selasky 	} else if (m->m_pkthdr.len > len) {
4319ca874cfSHans Petter Selasky 		m_adj(m, len - m->m_pkthdr.len);
4329ca874cfSHans Petter Selasky 		return (0);
4339ca874cfSHans Petter Selasky 	}
4349ca874cfSHans Petter Selasky 	return (TCP_LRO_CANNOT);
4359ca874cfSHans Petter Selasky }
4369ca874cfSHans Petter Selasky 
4379ca874cfSHans Petter Selasky static struct tcphdr *
4389ca874cfSHans Petter Selasky tcp_lro_get_th(struct mbuf *m)
4399ca874cfSHans Petter Selasky {
4409ca874cfSHans Petter Selasky 	return ((struct tcphdr *)((uint8_t *)m->m_data + m->m_pkthdr.lro_tcp_h_off));
441e57b2d0eSRandall Stewart }
442e57b2d0eSRandall Stewart 
44369a34e8dSRandall Stewart static void
44469a34e8dSRandall Stewart lro_free_mbuf_chain(struct mbuf *m)
44569a34e8dSRandall Stewart {
44669a34e8dSRandall Stewart 	struct mbuf *save;
44769a34e8dSRandall Stewart 
44869a34e8dSRandall Stewart 	while (m) {
44969a34e8dSRandall Stewart 		save = m->m_nextpkt;
45069a34e8dSRandall Stewart 		m->m_nextpkt = NULL;
45169a34e8dSRandall Stewart 		m_freem(m);
45269a34e8dSRandall Stewart 		m = save;
45369a34e8dSRandall Stewart 	}
45469a34e8dSRandall Stewart }
45569a34e8dSRandall Stewart 
4566c5087a8SJack F Vogel void
45762b5b6ecSBjoern A. Zeeb tcp_lro_free(struct lro_ctrl *lc)
4586c5087a8SJack F Vogel {
45962b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
460e936121dSHans Petter Selasky 	unsigned x;
4616c5087a8SJack F Vogel 
462e936121dSHans Petter Selasky 	/* reset LRO free list */
4631ea44822SSepherosa Ziehau 	LIST_INIT(&lc->lro_free);
464e936121dSHans Petter Selasky 
465e936121dSHans Petter Selasky 	/* free active mbufs, if any */
4661ea44822SSepherosa Ziehau 	while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {
46751e3c20dSSepherosa Ziehau 		tcp_lro_active_remove(le);
46869a34e8dSRandall Stewart 		lro_free_mbuf_chain(le->m_head);
4696c5087a8SJack F Vogel 	}
470e936121dSHans Petter Selasky 
47105cde7efSSepherosa Ziehau 	/* free hash table */
47205cde7efSSepherosa Ziehau 	free(lc->lro_hash, M_LRO);
47305cde7efSSepherosa Ziehau 	lc->lro_hash = NULL;
47405cde7efSSepherosa Ziehau 	lc->lro_hashsz = 0;
47505cde7efSSepherosa Ziehau 
476e936121dSHans Petter Selasky 	/* free mbuf array, if any */
477e936121dSHans Petter Selasky 	for (x = 0; x != lc->lro_mbuf_count; x++)
478fc271df3SHans Petter Selasky 		m_freem(lc->lro_mbuf_data[x].mb);
479e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
480e936121dSHans Petter Selasky 
481e936121dSHans Petter Selasky 	/* free allocated memory, if any */
482e936121dSHans Petter Selasky 	free(lc->lro_mbuf_data, M_LRO);
483e936121dSHans Petter Selasky 	lc->lro_mbuf_data = NULL;
4846c5087a8SJack F Vogel }
4856c5087a8SJack F Vogel 
48662b5b6ecSBjoern A. Zeeb static uint16_t
4879ca874cfSHans Petter Selasky tcp_lro_rx_csum_tcphdr(const struct tcphdr *th)
48862b5b6ecSBjoern A. Zeeb {
4899ca874cfSHans Petter Selasky 	const uint16_t *ptr;
4909ca874cfSHans Petter Selasky 	uint32_t csum;
4919ca874cfSHans Petter Selasky 	uint16_t len;
49262b5b6ecSBjoern A. Zeeb 
4939ca874cfSHans Petter Selasky 	csum = -th->th_sum;	/* exclude checksum field */
4949ca874cfSHans Petter Selasky 	len = th->th_off;
4959ca874cfSHans Petter Selasky 	ptr = (const uint16_t *)th;
4969ca874cfSHans Petter Selasky 	while (len--) {
4979ca874cfSHans Petter Selasky 		csum += *ptr;
4989ca874cfSHans Petter Selasky 		ptr++;
4999ca874cfSHans Petter Selasky 		csum += *ptr;
5009ca874cfSHans Petter Selasky 		ptr++;
50162b5b6ecSBjoern A. Zeeb 	}
5029ca874cfSHans Petter Selasky 	while (csum > 0xffff)
5039ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
50462b5b6ecSBjoern A. Zeeb 
5059ca874cfSHans Petter Selasky 	return (csum);
50662b5b6ecSBjoern A. Zeeb }
50762b5b6ecSBjoern A. Zeeb 
50862b5b6ecSBjoern A. Zeeb static uint16_t
5099ca874cfSHans Petter Selasky tcp_lro_rx_csum_data(const struct lro_parser *pa, uint16_t tcp_csum)
51062b5b6ecSBjoern A. Zeeb {
51162b5b6ecSBjoern A. Zeeb 	uint32_t c;
51262b5b6ecSBjoern A. Zeeb 	uint16_t cs;
51362b5b6ecSBjoern A. Zeeb 
5149ca874cfSHans Petter Selasky 	c = tcp_csum;
51562b5b6ecSBjoern A. Zeeb 
5169ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
51762b5b6ecSBjoern A. Zeeb #ifdef INET6
5189ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
5199ca874cfSHans Petter Selasky 		/* Compute full pseudo IPv6 header checksum. */
5209ca874cfSHans Petter Selasky 		cs = in6_cksum_pseudo(pa->ip6, ntohs(pa->ip6->ip6_plen), pa->ip6->ip6_nxt, 0);
52162b5b6ecSBjoern A. Zeeb 		break;
52262b5b6ecSBjoern A. Zeeb #endif
52362b5b6ecSBjoern A. Zeeb #ifdef INET
5249ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
5259ca874cfSHans Petter Selasky 		/* Compute full pseudo IPv4 header checsum. */
5269ca874cfSHans Petter Selasky 		cs = in_addword(ntohs(pa->ip4->ip_len) - sizeof(*pa->ip4), IPPROTO_TCP);
5279ca874cfSHans Petter Selasky 		cs = in_pseudo(pa->ip4->ip_src.s_addr, pa->ip4->ip_dst.s_addr, htons(cs));
52862b5b6ecSBjoern A. Zeeb 		break;
52962b5b6ecSBjoern A. Zeeb #endif
53062b5b6ecSBjoern A. Zeeb 	default:
53162b5b6ecSBjoern A. Zeeb 		cs = 0;		/* Keep compiler happy. */
5329ca874cfSHans Petter Selasky 		break;
53362b5b6ecSBjoern A. Zeeb 	}
53462b5b6ecSBjoern A. Zeeb 
5359ca874cfSHans Petter Selasky 	/* Complement checksum. */
53662b5b6ecSBjoern A. Zeeb 	cs = ~cs;
53762b5b6ecSBjoern A. Zeeb 	c += cs;
53862b5b6ecSBjoern A. Zeeb 
5399ca874cfSHans Petter Selasky 	/* Remove TCP header checksum. */
5409ca874cfSHans Petter Selasky 	cs = ~tcp_lro_rx_csum_tcphdr(pa->tcp);
54162b5b6ecSBjoern A. Zeeb 	c += cs;
5429ca874cfSHans Petter Selasky 
5439ca874cfSHans Petter Selasky 	/* Compute checksum remainder. */
54462b5b6ecSBjoern A. Zeeb 	while (c > 0xffff)
54562b5b6ecSBjoern A. Zeeb 		c = (c >> 16) + (c & 0xffff);
54662b5b6ecSBjoern A. Zeeb 
5479ca874cfSHans Petter Selasky 	return (c);
54862b5b6ecSBjoern A. Zeeb }
54962b5b6ecSBjoern A. Zeeb 
5506dd38b87SSepherosa Ziehau static void
5516dd38b87SSepherosa Ziehau tcp_lro_rx_done(struct lro_ctrl *lc)
5526dd38b87SSepherosa Ziehau {
5536dd38b87SSepherosa Ziehau 	struct lro_entry *le;
5546dd38b87SSepherosa Ziehau 
5551ea44822SSepherosa Ziehau 	while ((le = LIST_FIRST(&lc->lro_active)) != NULL) {
55651e3c20dSSepherosa Ziehau 		tcp_lro_active_remove(le);
5576dd38b87SSepherosa Ziehau 		tcp_lro_flush(lc, le);
5586dd38b87SSepherosa Ziehau 	}
5596dd38b87SSepherosa Ziehau }
5606dd38b87SSepherosa Ziehau 
5616c5087a8SJack F Vogel void
5627127e6acSNavdeep Parhar tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout)
5637127e6acSNavdeep Parhar {
5647127e6acSNavdeep Parhar 	struct lro_entry *le, *le_tmp;
565*b45daaeaSRandall Stewart 	uint64_t now, tov;
566*b45daaeaSRandall Stewart 	struct bintime bt;
5677127e6acSNavdeep Parhar 
5681ea44822SSepherosa Ziehau 	if (LIST_EMPTY(&lc->lro_active))
5697127e6acSNavdeep Parhar 		return;
5707127e6acSNavdeep Parhar 
571*b45daaeaSRandall Stewart 	/* get timeout time and current time in ns */
572*b45daaeaSRandall Stewart 	binuptime(&bt);
573*b45daaeaSRandall Stewart 	now = bintime2ns(&bt);
574*b45daaeaSRandall Stewart 	tov = ((timeout->tv_sec * 1000000000) + (timeout->tv_usec * 1000));
5751ea44822SSepherosa Ziehau 	LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) {
576*b45daaeaSRandall Stewart 		if (now >= (bintime2ns(&le->alloc_time) + tov)) {
57751e3c20dSSepherosa Ziehau 			tcp_lro_active_remove(le);
5787127e6acSNavdeep Parhar 			tcp_lro_flush(lc, le);
5797127e6acSNavdeep Parhar 		}
5807127e6acSNavdeep Parhar 	}
5817127e6acSNavdeep Parhar }
5827127e6acSNavdeep Parhar 
583e57b2d0eSRandall Stewart #ifdef INET
584e57b2d0eSRandall Stewart static int
5859ca874cfSHans Petter Selasky tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4)
586e57b2d0eSRandall Stewart {
587e57b2d0eSRandall Stewart 	uint16_t csum;
588e57b2d0eSRandall Stewart 
589e57b2d0eSRandall Stewart 	/* Legacy IP has a header checksum that needs to be correct. */
5909ca874cfSHans Petter Selasky 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
5919ca874cfSHans Petter Selasky 		if (__predict_false((m->m_pkthdr.csum_flags & CSUM_IP_VALID) == 0)) {
592e57b2d0eSRandall Stewart 			lc->lro_bad_csum++;
593e57b2d0eSRandall Stewart 			return (TCP_LRO_CANNOT);
594e57b2d0eSRandall Stewart 		}
595e57b2d0eSRandall Stewart 	} else {
596e57b2d0eSRandall Stewart 		csum = in_cksum_hdr(ip4);
5979ca874cfSHans Petter Selasky 		if (__predict_false(csum != 0)) {
598e57b2d0eSRandall Stewart 			lc->lro_bad_csum++;
599e57b2d0eSRandall Stewart 			return (TCP_LRO_CANNOT);
600e57b2d0eSRandall Stewart 		}
601e57b2d0eSRandall Stewart 	}
602e57b2d0eSRandall Stewart 	return (0);
603e57b2d0eSRandall Stewart }
604e57b2d0eSRandall Stewart #endif
605e57b2d0eSRandall Stewart 
6060a4f8510SRandall Stewart #ifdef TCPHPTS
607e57b2d0eSRandall Stewart static void
6089ca874cfSHans Petter Selasky tcp_lro_log(struct tcpcb *tp, const struct lro_ctrl *lc,
6099ca874cfSHans Petter Selasky     const struct lro_entry *le, const struct mbuf *m,
6109ca874cfSHans Petter Selasky     int frm, int32_t tcp_data_len, uint32_t th_seq,
6119ca874cfSHans Petter Selasky     uint32_t th_ack, uint16_t th_win)
612e57b2d0eSRandall Stewart {
613e57b2d0eSRandall Stewart 	if (tp->t_logstate != TCP_LOG_STATE_OFF) {
614e57b2d0eSRandall Stewart 		union tcp_log_stackspecific log;
615*b45daaeaSRandall Stewart 		struct timeval tv, btv;
616e57b2d0eSRandall Stewart 		uint32_t cts;
617e57b2d0eSRandall Stewart 
618e57b2d0eSRandall Stewart 		cts = tcp_get_usecs(&tv);
619e57b2d0eSRandall Stewart 		memset(&log, 0, sizeof(union tcp_log_stackspecific));
620e57b2d0eSRandall Stewart 		log.u_bbr.flex8 = frm;
621e57b2d0eSRandall Stewart 		log.u_bbr.flex1 = tcp_data_len;
622e57b2d0eSRandall Stewart 		if (m)
623e57b2d0eSRandall Stewart 			log.u_bbr.flex2 = m->m_pkthdr.len;
624e57b2d0eSRandall Stewart 		else
625e57b2d0eSRandall Stewart 			log.u_bbr.flex2 = 0;
6269ca874cfSHans Petter Selasky 		log.u_bbr.flex3 = le->m_head->m_pkthdr.lro_nsegs;
6279ca874cfSHans Petter Selasky 		log.u_bbr.flex4 = le->m_head->m_pkthdr.lro_tcp_d_len;
62869a34e8dSRandall Stewart 		if (le->m_head) {
629e57b2d0eSRandall Stewart 			log.u_bbr.flex5 = le->m_head->m_pkthdr.len;
630e57b2d0eSRandall Stewart 			log.u_bbr.delRate = le->m_head->m_flags;
631e57b2d0eSRandall Stewart 			log.u_bbr.rttProp = le->m_head->m_pkthdr.rcv_tstmp;
63269a34e8dSRandall Stewart 		}
633e57b2d0eSRandall Stewart 		log.u_bbr.inflight = th_seq;
634e57b2d0eSRandall Stewart 		log.u_bbr.timeStamp = cts;
635e57b2d0eSRandall Stewart 		log.u_bbr.epoch = le->next_seq;
636e57b2d0eSRandall Stewart 		log.u_bbr.delivered = th_ack;
637e57b2d0eSRandall Stewart 		log.u_bbr.lt_epoch = le->ack_seq;
638e57b2d0eSRandall Stewart 		log.u_bbr.pacing_gain = th_win;
639e57b2d0eSRandall Stewart 		log.u_bbr.cwnd_gain = le->window;
640b23b156eSWarner Losh 		log.u_bbr.cur_del_rate = (uintptr_t)m;
641b23b156eSWarner Losh 		log.u_bbr.bw_inuse = (uintptr_t)le->m_head;
642*b45daaeaSRandall Stewart 		bintime2timeval(&lc->lro_last_queue_time, &btv);
643*b45daaeaSRandall Stewart 		log.u_bbr.flex6 = tcp_tv_to_usectick(&btv);
6449ca874cfSHans Petter Selasky 		log.u_bbr.flex7 = le->compressed;
6459ca874cfSHans Petter Selasky 		log.u_bbr.pacing_gain = le->uncompressed;
64669a34e8dSRandall Stewart 		if (in_epoch(net_epoch_preempt))
64769a34e8dSRandall Stewart 			log.u_bbr.inhpts = 1;
64869a34e8dSRandall Stewart 		else
64969a34e8dSRandall Stewart 			log.u_bbr.inhpts = 0;
650e57b2d0eSRandall Stewart 		TCP_LOG_EVENTP(tp, NULL,
651e57b2d0eSRandall Stewart 			       &tp->t_inpcb->inp_socket->so_rcv,
652e57b2d0eSRandall Stewart 			       &tp->t_inpcb->inp_socket->so_snd,
653e57b2d0eSRandall Stewart 			       TCP_LOG_LRO, 0,
654e57b2d0eSRandall Stewart 			       0, &log, false, &tv);
655e57b2d0eSRandall Stewart 	}
656e57b2d0eSRandall Stewart }
6570a4f8510SRandall Stewart #endif
658e57b2d0eSRandall Stewart 
6599ca874cfSHans Petter Selasky static inline void
6609ca874cfSHans Petter Selasky tcp_lro_assign_and_checksum_16(uint16_t *ptr, uint16_t value, uint16_t *psum)
661e57b2d0eSRandall Stewart {
6629ca874cfSHans Petter Selasky 	uint32_t csum;
6636c5087a8SJack F Vogel 
6649ca874cfSHans Petter Selasky 	csum = 0xffff - *ptr + value;
6659ca874cfSHans Petter Selasky 	while (csum > 0xffff)
6669ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
6679ca874cfSHans Petter Selasky 	*ptr = value;
6689ca874cfSHans Petter Selasky 	*psum = csum;
66962b5b6ecSBjoern A. Zeeb }
67062b5b6ecSBjoern A. Zeeb 
6719ca874cfSHans Petter Selasky static uint16_t
6729ca874cfSHans Petter Selasky tcp_lro_update_checksum(const struct lro_parser *pa, const struct lro_entry *le,
6739ca874cfSHans Petter Selasky     uint16_t payload_len, uint16_t delta_sum)
6749ca874cfSHans Petter Selasky {
6759ca874cfSHans Petter Selasky 	uint32_t csum;
6769ca874cfSHans Petter Selasky 	uint16_t tlen;
6779ca874cfSHans Petter Selasky 	uint16_t temp[5] = {};
6789ca874cfSHans Petter Selasky 
6799ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
6809ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
6819ca874cfSHans Petter Selasky 		/* Compute new IPv4 length. */
6829ca874cfSHans Petter Selasky 		tlen = (pa->ip4->ip_hl << 2) + (pa->tcp->th_off << 2) + payload_len;
6839ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]);
6849ca874cfSHans Petter Selasky 
6859ca874cfSHans Petter Selasky 		/* Subtract delta from current IPv4 checksum. */
6869ca874cfSHans Petter Selasky 		csum = pa->ip4->ip_sum + 0xffff - temp[0];
6879ca874cfSHans Petter Selasky 		while (csum > 0xffff)
6889ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
6899ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]);
6909ca874cfSHans Petter Selasky 		goto update_tcp_header;
6919ca874cfSHans Petter Selasky 
6929ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
6939ca874cfSHans Petter Selasky 		/* Compute new IPv6 length. */
6949ca874cfSHans Petter Selasky 		tlen = (pa->tcp->th_off << 2) + payload_len;
6959ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]);
6969ca874cfSHans Petter Selasky 		goto update_tcp_header;
6979ca874cfSHans Petter Selasky 
6989ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_UDP:
6999ca874cfSHans Petter Selasky 		/* Compute new IPv4 length. */
7009ca874cfSHans Petter Selasky 		tlen = (pa->ip4->ip_hl << 2) + sizeof(*pa->udp) + payload_len;
7019ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]);
7029ca874cfSHans Petter Selasky 
7039ca874cfSHans Petter Selasky 		/* Subtract delta from current IPv4 checksum. */
7049ca874cfSHans Petter Selasky 		csum = pa->ip4->ip_sum + 0xffff - temp[0];
7059ca874cfSHans Petter Selasky 		while (csum > 0xffff)
7069ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
7079ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]);
7089ca874cfSHans Petter Selasky 		goto update_udp_header;
7099ca874cfSHans Petter Selasky 
7109ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_UDP:
7119ca874cfSHans Petter Selasky 		/* Compute new IPv6 length. */
7129ca874cfSHans Petter Selasky 		tlen = sizeof(*pa->udp) + payload_len;
7139ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]);
7149ca874cfSHans Petter Selasky 		goto update_udp_header;
7159ca874cfSHans Petter Selasky 
71662b5b6ecSBjoern A. Zeeb 	default:
7179ca874cfSHans Petter Selasky 		return (0);
71862b5b6ecSBjoern A. Zeeb 	}
7199ca874cfSHans Petter Selasky 
7209ca874cfSHans Petter Selasky update_tcp_header:
7219ca874cfSHans Petter Selasky 	/* Compute current TCP header checksum. */
7229ca874cfSHans Petter Selasky 	temp[2] = tcp_lro_rx_csum_tcphdr(pa->tcp);
72362b5b6ecSBjoern A. Zeeb 
72462b5b6ecSBjoern A. Zeeb 	/* Incorporate the latest ACK into the TCP header. */
7259ca874cfSHans Petter Selasky 	pa->tcp->th_ack = le->ack_seq;
7269ca874cfSHans Petter Selasky 	pa->tcp->th_win = le->window;
7279ca874cfSHans Petter Selasky 
72862b5b6ecSBjoern A. Zeeb 	/* Incorporate latest timestamp into the TCP header. */
72962b5b6ecSBjoern A. Zeeb 	if (le->timestamp != 0) {
7306c5087a8SJack F Vogel 		uint32_t *ts_ptr;
7316c5087a8SJack F Vogel 
7329ca874cfSHans Petter Selasky 		ts_ptr = (uint32_t *)(pa->tcp + 1);
73362b5b6ecSBjoern A. Zeeb 		ts_ptr[1] = htonl(le->tsval);
73462b5b6ecSBjoern A. Zeeb 		ts_ptr[2] = le->tsecr;
73562b5b6ecSBjoern A. Zeeb 	}
7369ca874cfSHans Petter Selasky 
7379ca874cfSHans Petter Selasky 	/* Compute new TCP header checksum. */
7389ca874cfSHans Petter Selasky 	temp[3] = tcp_lro_rx_csum_tcphdr(pa->tcp);
7399ca874cfSHans Petter Selasky 
7409ca874cfSHans Petter Selasky 	/* Compute new TCP checksum. */
7419ca874cfSHans Petter Selasky 	csum = pa->tcp->th_sum + 0xffff - delta_sum +
7429ca874cfSHans Petter Selasky 	    0xffff - temp[0] + 0xffff - temp[3] + temp[2];
7439ca874cfSHans Petter Selasky 	while (csum > 0xffff)
7449ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
7459ca874cfSHans Petter Selasky 
7469ca874cfSHans Petter Selasky 	/* Assign new TCP checksum. */
7479ca874cfSHans Petter Selasky 	tcp_lro_assign_and_checksum_16(&pa->tcp->th_sum, csum, &temp[4]);
7489ca874cfSHans Petter Selasky 
7499ca874cfSHans Petter Selasky 	/* Compute all modififications affecting next checksum. */
7509ca874cfSHans Petter Selasky 	csum = temp[0] + temp[1] + 0xffff - temp[2] +
7519ca874cfSHans Petter Selasky 	    temp[3] + temp[4] + delta_sum;
7529ca874cfSHans Petter Selasky 	while (csum > 0xffff)
7539ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
7549ca874cfSHans Petter Selasky 
7559ca874cfSHans Petter Selasky 	/* Return delta checksum to next stage, if any. */
7569ca874cfSHans Petter Selasky 	return (csum);
7579ca874cfSHans Petter Selasky 
7589ca874cfSHans Petter Selasky update_udp_header:
7599ca874cfSHans Petter Selasky 	tlen = sizeof(*pa->udp) + payload_len;
7609ca874cfSHans Petter Selasky 	/* Assign new UDP length and compute checksum delta. */
7619ca874cfSHans Petter Selasky 	tcp_lro_assign_and_checksum_16(&pa->udp->uh_ulen, htons(tlen), &temp[2]);
7629ca874cfSHans Petter Selasky 
7639ca874cfSHans Petter Selasky 	/* Check if there is a UDP checksum. */
7649ca874cfSHans Petter Selasky 	if (__predict_false(pa->udp->uh_sum != 0)) {
7659ca874cfSHans Petter Selasky 		/* Compute new UDP checksum. */
7669ca874cfSHans Petter Selasky 		csum = pa->udp->uh_sum + 0xffff - delta_sum +
7679ca874cfSHans Petter Selasky 		    0xffff - temp[0] + 0xffff - temp[2];
7689ca874cfSHans Petter Selasky 		while (csum > 0xffff)
7699ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
7709ca874cfSHans Petter Selasky 		/* Assign new UDP checksum. */
7719ca874cfSHans Petter Selasky 		tcp_lro_assign_and_checksum_16(&pa->udp->uh_sum, csum, &temp[3]);
772e57b2d0eSRandall Stewart 	}
7739ca874cfSHans Petter Selasky 
7749ca874cfSHans Petter Selasky 	/* Compute all modififications affecting next checksum. */
7759ca874cfSHans Petter Selasky 	csum = temp[0] + temp[1] + temp[2] + temp[3] + delta_sum;
7769ca874cfSHans Petter Selasky 	while (csum > 0xffff)
7779ca874cfSHans Petter Selasky 		csum = (csum >> 16) + (csum & 0xffff);
7789ca874cfSHans Petter Selasky 
7799ca874cfSHans Petter Selasky 	/* Return delta checksum to next stage, if any. */
7809ca874cfSHans Petter Selasky 	return (csum);
7819ca874cfSHans Petter Selasky }
7829ca874cfSHans Petter Selasky 
7839ca874cfSHans Petter Selasky static void
7849ca874cfSHans Petter Selasky tcp_flush_out_entry(struct lro_ctrl *lc, struct lro_entry *le)
7859ca874cfSHans Petter Selasky {
7869ca874cfSHans Petter Selasky 	/* Check if we need to recompute any checksums. */
7879ca874cfSHans Petter Selasky 	if (le->m_head->m_pkthdr.lro_nsegs > 1) {
7889ca874cfSHans Petter Selasky 		uint16_t csum;
7899ca874cfSHans Petter Selasky 
7909ca874cfSHans Petter Selasky 		switch (le->inner.data.lro_type) {
7919ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
7929ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->inner, le,
7939ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len,
7949ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_csum);
7959ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->outer, NULL,
7969ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len +
7979ca874cfSHans Petter Selasky 			    le->inner.total_hdr_len, csum);
7989ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
7999ca874cfSHans Petter Selasky 			    CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
8009ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_data = 0xffff;
8019ca874cfSHans Petter Selasky 			break;
8029ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
8039ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->inner, le,
8049ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len,
8059ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_csum);
8069ca874cfSHans Petter Selasky 			csum = tcp_lro_update_checksum(&le->outer, NULL,
8079ca874cfSHans Petter Selasky 			    le->m_head->m_pkthdr.lro_tcp_d_len +
8089ca874cfSHans Petter Selasky 			    le->inner.total_hdr_len, csum);
8099ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
8109ca874cfSHans Petter Selasky 			    CSUM_PSEUDO_HDR;
8119ca874cfSHans Petter Selasky 			le->m_head->m_pkthdr.csum_data = 0xffff;
8129ca874cfSHans Petter Selasky 			break;
8139ca874cfSHans Petter Selasky 		case LRO_TYPE_NONE:
8149ca874cfSHans Petter Selasky 			switch (le->outer.data.lro_type) {
8159ca874cfSHans Petter Selasky 			case LRO_TYPE_IPV4_TCP:
8169ca874cfSHans Petter Selasky 				csum = tcp_lro_update_checksum(&le->outer, le,
8179ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_len,
8189ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_csum);
8199ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
8209ca874cfSHans Petter Selasky 				    CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
8219ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_data = 0xffff;
8229ca874cfSHans Petter Selasky 				break;
8239ca874cfSHans Petter Selasky 			case LRO_TYPE_IPV6_TCP:
8249ca874cfSHans Petter Selasky 				csum = tcp_lro_update_checksum(&le->outer, le,
8259ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_len,
8269ca874cfSHans Petter Selasky 				    le->m_head->m_pkthdr.lro_tcp_d_csum);
8279ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
8289ca874cfSHans Petter Selasky 				    CSUM_PSEUDO_HDR;
8299ca874cfSHans Petter Selasky 				le->m_head->m_pkthdr.csum_data = 0xffff;
8309ca874cfSHans Petter Selasky 				break;
8319ca874cfSHans Petter Selasky 			default:
8329ca874cfSHans Petter Selasky 				break;
8339ca874cfSHans Petter Selasky 			}
8349ca874cfSHans Petter Selasky 			break;
8359ca874cfSHans Petter Selasky 		default:
8369ca874cfSHans Petter Selasky 			break;
8379ca874cfSHans Petter Selasky 		}
8389ca874cfSHans Petter Selasky 	}
8399ca874cfSHans Petter Selasky 
840e57b2d0eSRandall Stewart 	/*
841e57b2d0eSRandall Stewart 	 * Break any chain, this is not set to NULL on the singleton
842e57b2d0eSRandall Stewart 	 * case m_nextpkt points to m_head. Other case set them
843e57b2d0eSRandall Stewart 	 * m_nextpkt to NULL in push_and_replace.
844e57b2d0eSRandall Stewart 	 */
845e57b2d0eSRandall Stewart 	le->m_head->m_nextpkt = NULL;
8469ca874cfSHans Petter Selasky 	lc->lro_queued += le->m_head->m_pkthdr.lro_nsegs;
847e57b2d0eSRandall Stewart 	(*lc->ifp->if_input)(lc->ifp, le->m_head);
84862b5b6ecSBjoern A. Zeeb }
8496c5087a8SJack F Vogel 
850e57b2d0eSRandall Stewart static void
8519ca874cfSHans Petter Selasky tcp_set_entry_to_mbuf(struct lro_ctrl *lc, struct lro_entry *le,
8529ca874cfSHans Petter Selasky     struct mbuf *m, struct tcphdr *th)
853e57b2d0eSRandall Stewart {
854e57b2d0eSRandall Stewart 	uint32_t *ts_ptr;
855e57b2d0eSRandall Stewart 	uint16_t tcp_data_len;
8569ca874cfSHans Petter Selasky 	uint16_t tcp_opt_len;
857e57b2d0eSRandall Stewart 
858e57b2d0eSRandall Stewart 	ts_ptr = (uint32_t *)(th + 1);
8599ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
8609ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
8619ca874cfSHans Petter Selasky 
8629ca874cfSHans Petter Selasky 	/* Check if there is a timestamp option. */
8639ca874cfSHans Petter Selasky 	if (tcp_opt_len == 0 ||
8649ca874cfSHans Petter Selasky 	    __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
8659ca874cfSHans Petter Selasky 	    *ts_ptr != TCP_LRO_TS_OPTION)) {
8669ca874cfSHans Petter Selasky 		/* We failed to find the timestamp option. */
8679ca874cfSHans Petter Selasky 		le->timestamp = 0;
8689ca874cfSHans Petter Selasky 	} else {
869e57b2d0eSRandall Stewart 		le->timestamp = 1;
870e57b2d0eSRandall Stewart 		le->tsval = ntohl(*(ts_ptr + 1));
871e57b2d0eSRandall Stewart 		le->tsecr = *(ts_ptr + 2);
8729ca874cfSHans Petter Selasky 	}
8739ca874cfSHans Petter Selasky 
8749ca874cfSHans Petter Selasky 	tcp_data_len = m->m_pkthdr.lro_tcp_d_len;
8759ca874cfSHans Petter Selasky 
8769ca874cfSHans Petter Selasky 	/* Pull out TCP sequence numbers and window size. */
877e57b2d0eSRandall Stewart 	le->next_seq = ntohl(th->th_seq) + tcp_data_len;
878e57b2d0eSRandall Stewart 	le->ack_seq = th->th_ack;
879e57b2d0eSRandall Stewart 	le->window = th->th_win;
8809ca874cfSHans Petter Selasky 
8819ca874cfSHans Petter Selasky 	/* Setup new data pointers. */
882e57b2d0eSRandall Stewart 	le->m_head = m;
883e57b2d0eSRandall Stewart 	le->m_tail = m_last(m);
884e57b2d0eSRandall Stewart }
885e57b2d0eSRandall Stewart 
886e57b2d0eSRandall Stewart static void
8879ca874cfSHans Petter Selasky tcp_push_and_replace(struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m)
888e57b2d0eSRandall Stewart {
8899ca874cfSHans Petter Selasky 	struct lro_parser *pa;
8909ca874cfSHans Petter Selasky 
891e57b2d0eSRandall Stewart 	/*
8929ca874cfSHans Petter Selasky 	 * Push up the stack of the current entry
8939ca874cfSHans Petter Selasky 	 * and replace it with "m".
894e57b2d0eSRandall Stewart 	 */
895e57b2d0eSRandall Stewart 	struct mbuf *msave;
896e57b2d0eSRandall Stewart 
897e57b2d0eSRandall Stewart 	/* Grab off the next and save it */
898e57b2d0eSRandall Stewart 	msave = le->m_head->m_nextpkt;
899e57b2d0eSRandall Stewart 	le->m_head->m_nextpkt = NULL;
9009ca874cfSHans Petter Selasky 
9019ca874cfSHans Petter Selasky 	/* Now push out the old entry */
9029ca874cfSHans Petter Selasky 	tcp_flush_out_entry(lc, le);
9039ca874cfSHans Petter Selasky 
9049ca874cfSHans Petter Selasky 	/* Re-parse new header, should not fail. */
9059ca874cfSHans Petter Selasky 	pa = tcp_lro_parser(m, &le->outer, &le->inner, false);
9069ca874cfSHans Petter Selasky 	KASSERT(pa != NULL,
9079ca874cfSHans Petter Selasky 	    ("tcp_push_and_replace: LRO parser failed on m=%p\n", m));
9089ca874cfSHans Petter Selasky 
909e57b2d0eSRandall Stewart 	/*
9109ca874cfSHans Petter Selasky 	 * Now to replace the data properly in the entry
9119ca874cfSHans Petter Selasky 	 * we have to reset the TCP header and
912e57b2d0eSRandall Stewart 	 * other fields.
913e57b2d0eSRandall Stewart 	 */
9149ca874cfSHans Petter Selasky 	tcp_set_entry_to_mbuf(lc, le, m, pa->tcp);
9159ca874cfSHans Petter Selasky 
916e57b2d0eSRandall Stewart 	/* Restore the next list */
917e57b2d0eSRandall Stewart 	m->m_nextpkt = msave;
918e57b2d0eSRandall Stewart }
919e57b2d0eSRandall Stewart 
920e57b2d0eSRandall Stewart static void
9219ca874cfSHans Petter Selasky tcp_lro_mbuf_append_pkthdr(struct mbuf *m, const struct mbuf *p)
9229ca874cfSHans Petter Selasky {
9239ca874cfSHans Petter Selasky 	uint32_t csum;
9249ca874cfSHans Petter Selasky 
9259ca874cfSHans Petter Selasky 	if (m->m_pkthdr.lro_nsegs == 1) {
9269ca874cfSHans Petter Selasky 		/* Compute relative checksum. */
9279ca874cfSHans Petter Selasky 		csum = p->m_pkthdr.lro_tcp_d_csum;
9289ca874cfSHans Petter Selasky 	} else {
9299ca874cfSHans Petter Selasky 		/* Merge TCP data checksums. */
9309ca874cfSHans Petter Selasky 		csum = (uint32_t)m->m_pkthdr.lro_tcp_d_csum +
9319ca874cfSHans Petter Selasky 		    (uint32_t)p->m_pkthdr.lro_tcp_d_csum;
9329ca874cfSHans Petter Selasky 		while (csum > 0xffff)
9339ca874cfSHans Petter Selasky 			csum = (csum >> 16) + (csum & 0xffff);
9349ca874cfSHans Petter Selasky 	}
9359ca874cfSHans Petter Selasky 
9369ca874cfSHans Petter Selasky 	/* Update various counters. */
9379ca874cfSHans Petter Selasky 	m->m_pkthdr.len += p->m_pkthdr.lro_tcp_d_len;
9389ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_csum = csum;
9399ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_len += p->m_pkthdr.lro_tcp_d_len;
9409ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_nsegs += p->m_pkthdr.lro_nsegs;
9419ca874cfSHans Petter Selasky }
9429ca874cfSHans Petter Selasky 
9439ca874cfSHans Petter Selasky static void
9449ca874cfSHans Petter Selasky tcp_lro_condense(struct lro_ctrl *lc, struct lro_entry *le)
945e57b2d0eSRandall Stewart {
946e57b2d0eSRandall Stewart 	/*
947e57b2d0eSRandall Stewart 	 * Walk through the mbuf chain we
948e57b2d0eSRandall Stewart 	 * have on tap and compress/condense
949e57b2d0eSRandall Stewart 	 * as required.
950e57b2d0eSRandall Stewart 	 */
951e57b2d0eSRandall Stewart 	uint32_t *ts_ptr;
952e57b2d0eSRandall Stewart 	struct mbuf *m;
953e57b2d0eSRandall Stewart 	struct tcphdr *th;
9549ca874cfSHans Petter Selasky 	uint32_t tcp_data_len_total;
9559ca874cfSHans Petter Selasky 	uint32_t tcp_data_seg_total;
9569ca874cfSHans Petter Selasky 	uint16_t tcp_data_len;
9579ca874cfSHans Petter Selasky 	uint16_t tcp_opt_len;
958e57b2d0eSRandall Stewart 
959e57b2d0eSRandall Stewart 	/*
960e57b2d0eSRandall Stewart 	 * First we must check the lead (m_head)
961e57b2d0eSRandall Stewart 	 * we must make sure that it is *not*
962e57b2d0eSRandall Stewart 	 * something that should be sent up
963e57b2d0eSRandall Stewart 	 * right away (sack etc).
964e57b2d0eSRandall Stewart 	 */
965e57b2d0eSRandall Stewart again:
966e57b2d0eSRandall Stewart 	m = le->m_head->m_nextpkt;
967e57b2d0eSRandall Stewart 	if (m == NULL) {
9689ca874cfSHans Petter Selasky 		/* Just one left. */
969e57b2d0eSRandall Stewart 		return;
970e57b2d0eSRandall Stewart 	}
9719ca874cfSHans Petter Selasky 
9729ca874cfSHans Petter Selasky 	th = tcp_lro_get_th(m);
9739ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
9749ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
975e57b2d0eSRandall Stewart 	ts_ptr = (uint32_t *)(th + 1);
9769ca874cfSHans Petter Selasky 
9779ca874cfSHans Petter Selasky 	if (tcp_opt_len != 0 && __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
9789ca874cfSHans Petter Selasky 	    *ts_ptr != TCP_LRO_TS_OPTION)) {
979e57b2d0eSRandall Stewart 		/*
980e57b2d0eSRandall Stewart 		 * Its not the timestamp. We can't
981e57b2d0eSRandall Stewart 		 * use this guy as the head.
982e57b2d0eSRandall Stewart 		 */
983e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
9849ca874cfSHans Petter Selasky 		tcp_push_and_replace(lc, le, m);
985e57b2d0eSRandall Stewart 		goto again;
986e57b2d0eSRandall Stewart 	}
987e57b2d0eSRandall Stewart 	if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) {
988e57b2d0eSRandall Stewart 		/*
989e57b2d0eSRandall Stewart 		 * Make sure that previously seen segements/ACKs are delivered
990e57b2d0eSRandall Stewart 		 * before this segment, e.g. FIN.
991e57b2d0eSRandall Stewart 		 */
992e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
9939ca874cfSHans Petter Selasky 		tcp_push_and_replace(lc, le, m);
994e57b2d0eSRandall Stewart 		goto again;
995e57b2d0eSRandall Stewart 	}
996e57b2d0eSRandall Stewart 	while((m = le->m_head->m_nextpkt) != NULL) {
997e57b2d0eSRandall Stewart 		/*
998e57b2d0eSRandall Stewart 		 * condense m into le, first
999e57b2d0eSRandall Stewart 		 * pull m out of the list.
1000e57b2d0eSRandall Stewart 		 */
1001e57b2d0eSRandall Stewart 		le->m_head->m_nextpkt = m->m_nextpkt;
1002e57b2d0eSRandall Stewart 		m->m_nextpkt = NULL;
1003e57b2d0eSRandall Stewart 		/* Setup my data */
10049ca874cfSHans Petter Selasky 		tcp_data_len = m->m_pkthdr.lro_tcp_d_len;
10059ca874cfSHans Petter Selasky 		th = tcp_lro_get_th(m);
1006e57b2d0eSRandall Stewart 		ts_ptr = (uint32_t *)(th + 1);
10079ca874cfSHans Petter Selasky 		tcp_opt_len = (th->th_off << 2);
10089ca874cfSHans Petter Selasky 		tcp_opt_len -= sizeof(*th);
10099ca874cfSHans Petter Selasky 		tcp_data_len_total = le->m_head->m_pkthdr.lro_tcp_d_len + tcp_data_len;
10109ca874cfSHans Petter Selasky 		tcp_data_seg_total = le->m_head->m_pkthdr.lro_nsegs + m->m_pkthdr.lro_nsegs;
10119ca874cfSHans Petter Selasky 
10129ca874cfSHans Petter Selasky 		if (tcp_data_seg_total >= lc->lro_ackcnt_lim ||
10139ca874cfSHans Petter Selasky 		    tcp_data_len_total >= lc->lro_length_lim) {
1014e57b2d0eSRandall Stewart 			/* Flush now if appending will result in overflow. */
10159ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1016e57b2d0eSRandall Stewart 			goto again;
1017e57b2d0eSRandall Stewart 		}
10189ca874cfSHans Petter Selasky 		if (tcp_opt_len != 0 &&
10199ca874cfSHans Petter Selasky 		    __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA ||
10209ca874cfSHans Petter Selasky 		    *ts_ptr != TCP_LRO_TS_OPTION)) {
1021e57b2d0eSRandall Stewart 			/*
1022e57b2d0eSRandall Stewart 			 * Maybe a sack in the new one? We need to
1023e57b2d0eSRandall Stewart 			 * start all over after flushing the
1024e57b2d0eSRandall Stewart 			 * current le. We will go up to the beginning
1025e57b2d0eSRandall Stewart 			 * and flush it (calling the replace again possibly
1026e57b2d0eSRandall Stewart 			 * or just returning).
1027e57b2d0eSRandall Stewart 			 */
10289ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1029e57b2d0eSRandall Stewart 			goto again;
1030e57b2d0eSRandall Stewart 		}
1031e57b2d0eSRandall Stewart 		if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) {
10329ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1033e57b2d0eSRandall Stewart 			goto again;
1034e57b2d0eSRandall Stewart 		}
10359ca874cfSHans Petter Selasky 		if (tcp_opt_len != 0) {
1036e57b2d0eSRandall Stewart 			uint32_t tsval = ntohl(*(ts_ptr + 1));
1037e57b2d0eSRandall Stewart 			/* Make sure timestamp values are increasing. */
1038e57b2d0eSRandall Stewart 			if (TSTMP_GT(le->tsval, tsval))  {
10399ca874cfSHans Petter Selasky 				tcp_push_and_replace(lc, le, m);
1040e57b2d0eSRandall Stewart 				goto again;
1041e57b2d0eSRandall Stewart 			}
1042e57b2d0eSRandall Stewart 			le->tsval = tsval;
1043e57b2d0eSRandall Stewart 			le->tsecr = *(ts_ptr + 2);
1044e57b2d0eSRandall Stewart 		}
1045e57b2d0eSRandall Stewart 		/* Try to append the new segment. */
1046e57b2d0eSRandall Stewart 		if (__predict_false(ntohl(th->th_seq) != le->next_seq ||
1047e57b2d0eSRandall Stewart 				    (tcp_data_len == 0 &&
1048e57b2d0eSRandall Stewart 				     le->ack_seq == th->th_ack &&
1049e57b2d0eSRandall Stewart 				     le->window == th->th_win))) {
1050e57b2d0eSRandall Stewart 			/* Out of order packet or duplicate ACK. */
10519ca874cfSHans Petter Selasky 			tcp_push_and_replace(lc, le, m);
1052e57b2d0eSRandall Stewart 			goto again;
1053e57b2d0eSRandall Stewart 		}
10549ca874cfSHans Petter Selasky 		if (tcp_data_len != 0 ||
10559ca874cfSHans Petter Selasky 		    SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
1056e57b2d0eSRandall Stewart 			le->next_seq += tcp_data_len;
1057e57b2d0eSRandall Stewart 			le->ack_seq = th->th_ack;
1058e57b2d0eSRandall Stewart 			le->window = th->th_win;
1059e57b2d0eSRandall Stewart 		} else if (th->th_ack == le->ack_seq) {
1060e57b2d0eSRandall Stewart 			le->window = WIN_MAX(le->window, th->th_win);
1061e57b2d0eSRandall Stewart 		}
10629ca874cfSHans Petter Selasky 
1063e57b2d0eSRandall Stewart 		if (tcp_data_len == 0) {
1064e57b2d0eSRandall Stewart 			m_freem(m);
1065e57b2d0eSRandall Stewart 			continue;
1066e57b2d0eSRandall Stewart 		}
10679ca874cfSHans Petter Selasky 
10689ca874cfSHans Petter Selasky 		/* Merge TCP data checksum and length to head mbuf. */
10699ca874cfSHans Petter Selasky 		tcp_lro_mbuf_append_pkthdr(le->m_head, m);
10709ca874cfSHans Petter Selasky 
1071e57b2d0eSRandall Stewart 		/*
1072e57b2d0eSRandall Stewart 		 * Adjust the mbuf so that m_data points to the first byte of
1073e57b2d0eSRandall Stewart 		 * the ULP payload.  Adjust the mbuf to avoid complications and
1074e57b2d0eSRandall Stewart 		 * append new segment to existing mbuf chain.
1075e57b2d0eSRandall Stewart 		 */
1076e57b2d0eSRandall Stewart 		m_adj(m, m->m_pkthdr.len - tcp_data_len);
1077e57b2d0eSRandall Stewart 		m_demote_pkthdr(m);
1078e57b2d0eSRandall Stewart 		le->m_tail->m_next = m;
1079e57b2d0eSRandall Stewart 		le->m_tail = m_last(m);
1080e57b2d0eSRandall Stewart 	}
1081e57b2d0eSRandall Stewart }
1082e57b2d0eSRandall Stewart 
1083373013b0SConrad Meyer #ifdef TCPHPTS
1084e57b2d0eSRandall Stewart static void
10859ca874cfSHans Petter Selasky tcp_queue_pkts(struct inpcb *inp, struct tcpcb *tp, struct lro_entry *le)
1086e57b2d0eSRandall Stewart {
10879ca874cfSHans Petter Selasky 	INP_WLOCK_ASSERT(inp);
1088e57b2d0eSRandall Stewart 	if (tp->t_in_pkt == NULL) {
1089e57b2d0eSRandall Stewart 		/* Nothing yet there */
1090e57b2d0eSRandall Stewart 		tp->t_in_pkt = le->m_head;
1091e57b2d0eSRandall Stewart 		tp->t_tail_pkt = le->m_last_mbuf;
1092e57b2d0eSRandall Stewart 	} else {
1093e57b2d0eSRandall Stewart 		/* Already some there */
1094e57b2d0eSRandall Stewart 		tp->t_tail_pkt->m_nextpkt = le->m_head;
1095e57b2d0eSRandall Stewart 		tp->t_tail_pkt = le->m_last_mbuf;
1096e57b2d0eSRandall Stewart 	}
1097e57b2d0eSRandall Stewart 	le->m_head = NULL;
1098e57b2d0eSRandall Stewart 	le->m_last_mbuf = NULL;
1099e57b2d0eSRandall Stewart }
1100e57b2d0eSRandall Stewart 
110169a34e8dSRandall Stewart static struct mbuf *
11029ca874cfSHans Petter Selasky tcp_lro_get_last_if_ackcmp(struct lro_ctrl *lc, struct lro_entry *le,
11039ca874cfSHans Petter Selasky     struct inpcb *inp, int32_t *new_m)
1104e57b2d0eSRandall Stewart {
110569a34e8dSRandall Stewart 	struct tcpcb *tp;
11069ca874cfSHans Petter Selasky 	struct mbuf *m;
1107e57b2d0eSRandall Stewart 
110869a34e8dSRandall Stewart 	tp = intotcpcb(inp);
11099ca874cfSHans Petter Selasky 	if (__predict_false(tp == NULL))
11109ca874cfSHans Petter Selasky 		return (NULL);
11119ca874cfSHans Petter Selasky 
111269a34e8dSRandall Stewart 	/* Look at the last mbuf if any in queue */
111369a34e8dSRandall Stewart 	m = tp->t_tail_pkt;
11149ca874cfSHans Petter Selasky 	if (m != NULL && (m->m_flags & M_ACKCMP) != 0) {
11159ca874cfSHans Petter Selasky 		if (M_TRAILINGSPACE(m) >= sizeof(struct tcp_ackent)) {
11169ca874cfSHans Petter Selasky 			tcp_lro_log(tp, lc, le, NULL, 23, 0, 0, 0, 0);
11179ca874cfSHans Petter Selasky 			*new_m = 0;
11189ca874cfSHans Petter Selasky 			counter_u64_add(tcp_extra_mbuf, 1);
11199ca874cfSHans Petter Selasky 			return (m);
112069a34e8dSRandall Stewart 		} else {
11219ca874cfSHans Petter Selasky 			/* Mark we ran out of space */
112269a34e8dSRandall Stewart 			inp->inp_flags2 |= INP_MBUF_L_ACKS;
112369a34e8dSRandall Stewart 		}
112469a34e8dSRandall Stewart 	}
11259ca874cfSHans Petter Selasky 	/* Decide mbuf size. */
11269ca874cfSHans Petter Selasky 	if (inp->inp_flags2 & INP_MBUF_L_ACKS)
11279ca874cfSHans Petter Selasky 		m = m_getcl(M_NOWAIT, MT_DATA, M_ACKCMP | M_PKTHDR);
11289ca874cfSHans Petter Selasky 	else
11299ca874cfSHans Petter Selasky 		m = m_gethdr(M_NOWAIT, MT_DATA);
11309ca874cfSHans Petter Selasky 
11319ca874cfSHans Petter Selasky 	if (__predict_false(m == NULL)) {
11329ca874cfSHans Petter Selasky 		counter_u64_add(tcp_would_have_but, 1);
11339ca874cfSHans Petter Selasky 		return (NULL);
113469a34e8dSRandall Stewart 	}
11359ca874cfSHans Petter Selasky 	counter_u64_add(tcp_comp_total, 1);
11369ca874cfSHans Petter Selasky 	m->m_flags |= M_ACKCMP;
11379ca874cfSHans Petter Selasky 	*new_m = 1;
113869a34e8dSRandall Stewart 	return (m);
113969a34e8dSRandall Stewart }
114069a34e8dSRandall Stewart 
114169a34e8dSRandall Stewart static struct inpcb *
11429ca874cfSHans Petter Selasky tcp_lro_lookup(struct ifnet *ifp, struct lro_parser *pa)
114369a34e8dSRandall Stewart {
11449ca874cfSHans Petter Selasky 	struct inpcb *inp;
114569a34e8dSRandall Stewart 
114669a34e8dSRandall Stewart 	NET_EPOCH_ASSERT();
11479ca874cfSHans Petter Selasky 
11489ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
1149e57b2d0eSRandall Stewart #ifdef INET6
11509ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
11519ca874cfSHans Petter Selasky 		inp = in6_pcblookup(&V_tcbinfo,
11529ca874cfSHans Petter Selasky 		    &pa->data.s_addr.v6,
11539ca874cfSHans Petter Selasky 		    pa->data.s_port,
11549ca874cfSHans Petter Selasky 		    &pa->data.d_addr.v6,
11559ca874cfSHans Petter Selasky 		    pa->data.d_port,
1156e57b2d0eSRandall Stewart 		    INPLOOKUP_WLOCKPCB,
11579ca874cfSHans Petter Selasky 		    ifp);
1158e57b2d0eSRandall Stewart 		break;
1159e57b2d0eSRandall Stewart #endif
1160e57b2d0eSRandall Stewart #ifdef INET
11619ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
11629ca874cfSHans Petter Selasky 		inp = in_pcblookup(&V_tcbinfo,
11639ca874cfSHans Petter Selasky 		    pa->data.s_addr.v4,
11649ca874cfSHans Petter Selasky 		    pa->data.s_port,
11659ca874cfSHans Petter Selasky 		    pa->data.d_addr.v4,
11669ca874cfSHans Petter Selasky 		    pa->data.d_port,
1167e57b2d0eSRandall Stewart 		    INPLOOKUP_WLOCKPCB,
11689ca874cfSHans Petter Selasky 		    ifp);
1169e57b2d0eSRandall Stewart 		break;
1170e57b2d0eSRandall Stewart #endif
11719ca874cfSHans Petter Selasky 	default:
11729ca874cfSHans Petter Selasky 		inp = NULL;
11739ca874cfSHans Petter Selasky 		break;
1174e57b2d0eSRandall Stewart 	}
117569a34e8dSRandall Stewart 	return (inp);
117669a34e8dSRandall Stewart }
117769a34e8dSRandall Stewart 
11789ca874cfSHans Petter Selasky static inline bool
11799ca874cfSHans Petter Selasky tcp_lro_ack_valid(struct mbuf *m, struct tcphdr *th, uint32_t **ppts, bool *other_opts)
11809ca874cfSHans Petter Selasky {
11819ca874cfSHans Petter Selasky 	/*
11829ca874cfSHans Petter Selasky 	 * This function returns two bits of valuable information.
11839ca874cfSHans Petter Selasky 	 * a) Is what is present capable of being ack-compressed,
11849ca874cfSHans Petter Selasky 	 *    we can ack-compress if there is no options or just
11859ca874cfSHans Petter Selasky 	 *    a timestamp option, and of course the th_flags must
11869ca874cfSHans Petter Selasky 	 *    be correct as well.
11879ca874cfSHans Petter Selasky 	 * b) Our other options present such as SACK. This is
11889ca874cfSHans Petter Selasky 	 *    used to determine if we want to wakeup or not.
11899ca874cfSHans Petter Selasky 	 */
11909ca874cfSHans Petter Selasky 	bool ret = true;
11919ca874cfSHans Petter Selasky 
11929ca874cfSHans Petter Selasky 	switch (th->th_off << 2) {
11939ca874cfSHans Petter Selasky 	case (sizeof(*th) + TCPOLEN_TSTAMP_APPA):
11949ca874cfSHans Petter Selasky 		*ppts = (uint32_t *)(th + 1);
11959ca874cfSHans Petter Selasky 		/* Check if we have only one timestamp option. */
11969ca874cfSHans Petter Selasky 		if (**ppts == TCP_LRO_TS_OPTION)
11979ca874cfSHans Petter Selasky 			*other_opts = false;
11989ca874cfSHans Petter Selasky 		else {
11999ca874cfSHans Petter Selasky 			*other_opts = true;
12009ca874cfSHans Petter Selasky 			ret = false;
12019ca874cfSHans Petter Selasky 		}
12029ca874cfSHans Petter Selasky 		break;
12039ca874cfSHans Petter Selasky 	case (sizeof(*th)):
12049ca874cfSHans Petter Selasky 		/* No options. */
12059ca874cfSHans Petter Selasky 		*ppts = NULL;
12069ca874cfSHans Petter Selasky 		*other_opts = false;
12079ca874cfSHans Petter Selasky 		break;
12089ca874cfSHans Petter Selasky 	default:
12099ca874cfSHans Petter Selasky 		*ppts = NULL;
12109ca874cfSHans Petter Selasky 		*other_opts = true;
12119ca874cfSHans Petter Selasky 		ret = false;
12129ca874cfSHans Petter Selasky 		break;
12139ca874cfSHans Petter Selasky 	}
12149ca874cfSHans Petter Selasky 	/* For ACKCMP we only accept ACK, PUSH, ECE and CWR. */
12159ca874cfSHans Petter Selasky 	if ((th->th_flags & ~(TH_ACK | TH_PUSH | TH_ECE | TH_CWR)) != 0)
12169ca874cfSHans Petter Selasky 		ret = false;
12179ca874cfSHans Petter Selasky 	/* If it has data on it we cannot compress it */
12189ca874cfSHans Petter Selasky 	if (m->m_pkthdr.lro_tcp_d_len)
12199ca874cfSHans Petter Selasky 		ret = false;
12209ca874cfSHans Petter Selasky 
12219ca874cfSHans Petter Selasky 	/* ACK flag must be set. */
12229ca874cfSHans Petter Selasky 	if (!(th->th_flags & TH_ACK))
12239ca874cfSHans Petter Selasky 		ret = false;
12249ca874cfSHans Petter Selasky 	return (ret);
12259ca874cfSHans Petter Selasky }
12269ca874cfSHans Petter Selasky 
12279ca874cfSHans Petter Selasky static int
12289ca874cfSHans Petter Selasky tcp_lro_flush_tcphpts(struct lro_ctrl *lc, struct lro_entry *le)
12299ca874cfSHans Petter Selasky {
12309ca874cfSHans Petter Selasky 	struct inpcb *inp;
12319ca874cfSHans Petter Selasky 	struct tcpcb *tp;
12329ca874cfSHans Petter Selasky 	struct mbuf **pp, *cmp, *mv_to;
12339ca874cfSHans Petter Selasky 	bool bpf_req, should_wake;
12349ca874cfSHans Petter Selasky 
12359ca874cfSHans Petter Selasky 	/* Check if packet doesn't belongs to our network interface. */
12369ca874cfSHans Petter Selasky 	if ((tcplro_stacks_wanting_mbufq == 0) ||
12379ca874cfSHans Petter Selasky 	    (le->outer.data.vlan_id != 0) ||
12389ca874cfSHans Petter Selasky 	    (le->inner.data.lro_type != LRO_TYPE_NONE))
12399ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
12409ca874cfSHans Petter Selasky 
12419ca874cfSHans Petter Selasky #ifdef INET6
12429ca874cfSHans Petter Selasky 	/*
12439ca874cfSHans Petter Selasky 	 * Be proactive about unspecified IPv6 address in source. As
12449ca874cfSHans Petter Selasky 	 * we use all-zero to indicate unbounded/unconnected pcb,
12459ca874cfSHans Petter Selasky 	 * unspecified IPv6 address can be used to confuse us.
12469ca874cfSHans Petter Selasky 	 *
12479ca874cfSHans Petter Selasky 	 * Note that packets with unspecified IPv6 destination is
12489ca874cfSHans Petter Selasky 	 * already dropped in ip6_input.
12499ca874cfSHans Petter Selasky 	 */
12509ca874cfSHans Petter Selasky 	if (__predict_false(le->outer.data.lro_type == LRO_TYPE_IPV6_TCP &&
12519ca874cfSHans Petter Selasky 	    IN6_IS_ADDR_UNSPECIFIED(&le->outer.data.s_addr.v6)))
12529ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
12539ca874cfSHans Petter Selasky 
12549ca874cfSHans Petter Selasky 	if (__predict_false(le->inner.data.lro_type == LRO_TYPE_IPV6_TCP &&
12559ca874cfSHans Petter Selasky 	    IN6_IS_ADDR_UNSPECIFIED(&le->inner.data.s_addr.v6)))
12569ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
125769a34e8dSRandall Stewart #endif
12589ca874cfSHans Petter Selasky 	/* Lookup inp, if any. */
12599ca874cfSHans Petter Selasky 	inp = tcp_lro_lookup(lc->ifp,
12609ca874cfSHans Petter Selasky 	    (le->inner.data.lro_type == LRO_TYPE_NONE) ? &le->outer : &le->inner);
12619ca874cfSHans Petter Selasky 	if (inp == NULL)
12629ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
126369a34e8dSRandall Stewart 
12649ca874cfSHans Petter Selasky 	counter_u64_add(tcp_inp_lro_locks_taken, 1);
12659ca874cfSHans Petter Selasky 
12669ca874cfSHans Petter Selasky 	/* Get TCP control structure. */
12679ca874cfSHans Petter Selasky 	tp = intotcpcb(inp);
12689ca874cfSHans Petter Selasky 
12699ca874cfSHans Petter Selasky 	/* Check if the inp is dead, Jim. */
12709ca874cfSHans Petter Selasky 	if (tp == NULL ||
12719ca874cfSHans Petter Selasky 	    (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) ||
12729ca874cfSHans Petter Selasky 	    (inp->inp_flags2 & INP_FREED)) {
12739ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
12749ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
127569a34e8dSRandall Stewart 	}
127669a34e8dSRandall Stewart 
12779ca874cfSHans Petter Selasky 	/* Check if the transport doesn't support the needed optimizations. */
12789ca874cfSHans Petter Selasky 	if ((inp->inp_flags2 & (INP_SUPPORTS_MBUFQ | INP_MBUF_ACKCMP)) == 0) {
12799ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
12809ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
128169a34e8dSRandall Stewart 	}
12829ca874cfSHans Petter Selasky 
12839ca874cfSHans Petter Selasky 	if (inp->inp_flags2 & INP_MBUF_QUEUE_READY)
12849ca874cfSHans Petter Selasky 		should_wake = false;
12859ca874cfSHans Petter Selasky 	else
12869ca874cfSHans Petter Selasky 		should_wake = true;
12879ca874cfSHans Petter Selasky 	/* Check if packets should be tapped to BPF. */
12889ca874cfSHans Petter Selasky 	bpf_req = bpf_peers_present(lc->ifp->if_bpf);
12899ca874cfSHans Petter Selasky 
12909ca874cfSHans Petter Selasky 	/* Strip and compress all the incoming packets. */
12919ca874cfSHans Petter Selasky 	cmp = NULL;
12929ca874cfSHans Petter Selasky 	for (pp = &le->m_head; *pp != NULL; ) {
12939ca874cfSHans Petter Selasky 		mv_to = NULL;
12949ca874cfSHans Petter Selasky 		if (do_bpf_strip_and_compress(inp, lc, le, pp,
12959ca874cfSHans Petter Selasky 			 &cmp, &mv_to, &should_wake, bpf_req ) == false) {
12969ca874cfSHans Petter Selasky 			/* Advance to next mbuf. */
12979ca874cfSHans Petter Selasky 			pp = &(*pp)->m_nextpkt;
12989ca874cfSHans Petter Selasky 		} else if (mv_to != NULL) {
12999ca874cfSHans Petter Selasky 			/* We are asked to move pp up */
13009ca874cfSHans Petter Selasky 			pp = &mv_to->m_nextpkt;
13019ca874cfSHans Petter Selasky 		}
13029ca874cfSHans Petter Selasky 	}
13039ca874cfSHans Petter Selasky 	/* Update "m_last_mbuf", if any. */
13049ca874cfSHans Petter Selasky 	if (pp == &le->m_head)
13059ca874cfSHans Petter Selasky 		le->m_last_mbuf = *pp;
13069ca874cfSHans Petter Selasky 	else
13079ca874cfSHans Petter Selasky 		le->m_last_mbuf = __containerof(pp, struct mbuf, m_nextpkt);
13089ca874cfSHans Petter Selasky 
13099ca874cfSHans Petter Selasky 	/* Check if any data mbufs left. */
13109ca874cfSHans Petter Selasky 	if (le->m_head != NULL) {
13119ca874cfSHans Petter Selasky 		counter_u64_add(tcp_inp_lro_direct_queue, 1);
13129ca874cfSHans Petter Selasky 		tcp_lro_log(tp, lc, le, NULL, 22, 1,
13139ca874cfSHans Petter Selasky 			    inp->inp_flags2, inp->inp_in_input, 1);
13149ca874cfSHans Petter Selasky 		tcp_queue_pkts(inp, tp, le);
13159ca874cfSHans Petter Selasky 	}
13169ca874cfSHans Petter Selasky 	if (should_wake) {
13179ca874cfSHans Petter Selasky 		/* Wakeup */
13189ca874cfSHans Petter Selasky 		counter_u64_add(tcp_inp_lro_wokeup_queue, 1);
13199ca874cfSHans Petter Selasky 		if ((*tp->t_fb->tfb_do_queued_segments)(inp->inp_socket, tp, 0))
13209ca874cfSHans Petter Selasky 			inp = NULL;
13219ca874cfSHans Petter Selasky 	}
13229ca874cfSHans Petter Selasky 	if (inp != NULL)
13239ca874cfSHans Petter Selasky 		INP_WUNLOCK(inp);
13249ca874cfSHans Petter Selasky 	return (0);	/* Success. */
132569a34e8dSRandall Stewart }
132669a34e8dSRandall Stewart #endif
132769a34e8dSRandall Stewart 
132869a34e8dSRandall Stewart void
132969a34e8dSRandall Stewart tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le)
133069a34e8dSRandall Stewart {
13319ca874cfSHans Petter Selasky 	/* Only optimise if there are multiple packets waiting. */
133269a34e8dSRandall Stewart #ifdef TCPHPTS
13339ca874cfSHans Petter Selasky 	int error;
133469a34e8dSRandall Stewart 
133569a34e8dSRandall Stewart 	CURVNET_SET(lc->ifp->if_vnet);
13369ca874cfSHans Petter Selasky 	error = tcp_lro_flush_tcphpts(lc, le);
13379ca874cfSHans Petter Selasky 	CURVNET_RESTORE();
13389ca874cfSHans Petter Selasky 	if (error != 0) {
13399ca874cfSHans Petter Selasky #endif
13409ca874cfSHans Petter Selasky 		tcp_lro_condense(lc, le);
13419ca874cfSHans Petter Selasky 		tcp_flush_out_entry(lc, le);
1342e57b2d0eSRandall Stewart #ifdef TCPHPTS
1343e57b2d0eSRandall Stewart 	}
1344e57b2d0eSRandall Stewart #endif
134562b5b6ecSBjoern A. Zeeb 	lc->lro_flushed++;
134662b5b6ecSBjoern A. Zeeb 	bzero(le, sizeof(*le));
13471ea44822SSepherosa Ziehau 	LIST_INSERT_HEAD(&lc->lro_free, le, next);
134862b5b6ecSBjoern A. Zeeb }
13496c5087a8SJack F Vogel 
1350fc271df3SHans Petter Selasky #ifdef HAVE_INLINE_FLSLL
1351fc271df3SHans Petter Selasky #define	tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1))
1352fc271df3SHans Petter Selasky #else
1353fc271df3SHans Petter Selasky static inline uint64_t
1354fc271df3SHans Petter Selasky tcp_lro_msb_64(uint64_t x)
1355e936121dSHans Petter Selasky {
1356fc271df3SHans Petter Selasky 	x |= (x >> 1);
1357fc271df3SHans Petter Selasky 	x |= (x >> 2);
1358fc271df3SHans Petter Selasky 	x |= (x >> 4);
1359fc271df3SHans Petter Selasky 	x |= (x >> 8);
1360fc271df3SHans Petter Selasky 	x |= (x >> 16);
1361fc271df3SHans Petter Selasky 	x |= (x >> 32);
1362fc271df3SHans Petter Selasky 	return (x & ~(x >> 1));
1363fc271df3SHans Petter Selasky }
1364fc271df3SHans Petter Selasky #endif
1365e936121dSHans Petter Selasky 
1366fc271df3SHans Petter Selasky /*
1367fc271df3SHans Petter Selasky  * The tcp_lro_sort() routine is comparable to qsort(), except it has
1368fc271df3SHans Petter Selasky  * a worst case complexity limit of O(MIN(N,64)*N), where N is the
1369fc271df3SHans Petter Selasky  * number of elements to sort and 64 is the number of sequence bits
1370fc271df3SHans Petter Selasky  * available. The algorithm is bit-slicing the 64-bit sequence number,
1371fc271df3SHans Petter Selasky  * sorting one bit at a time from the most significant bit until the
1372ec668905SHans Petter Selasky  * least significant one, skipping the constant bits. This is
1373ec668905SHans Petter Selasky  * typically called a radix sort.
1374fc271df3SHans Petter Selasky  */
1375fc271df3SHans Petter Selasky static void
1376fc271df3SHans Petter Selasky tcp_lro_sort(struct lro_mbuf_sort *parray, uint32_t size)
1377fc271df3SHans Petter Selasky {
1378fc271df3SHans Petter Selasky 	struct lro_mbuf_sort temp;
1379fc271df3SHans Petter Selasky 	uint64_t ones;
1380fc271df3SHans Petter Selasky 	uint64_t zeros;
1381fc271df3SHans Petter Selasky 	uint32_t x;
1382fc271df3SHans Petter Selasky 	uint32_t y;
1383e936121dSHans Petter Selasky 
1384fc271df3SHans Petter Selasky repeat:
1385ec668905SHans Petter Selasky 	/* for small arrays insertion sort is faster */
1386fc271df3SHans Petter Selasky 	if (size <= 12) {
1387ec668905SHans Petter Selasky 		for (x = 1; x < size; x++) {
1388fc271df3SHans Petter Selasky 			temp = parray[x];
1389ec668905SHans Petter Selasky 			for (y = x; y > 0 && temp.seq < parray[y - 1].seq; y--)
1390ec668905SHans Petter Selasky 				parray[y] = parray[y - 1];
1391fc271df3SHans Petter Selasky 			parray[y] = temp;
1392fc271df3SHans Petter Selasky 		}
1393fc271df3SHans Petter Selasky 		return;
1394fc271df3SHans Petter Selasky 	}
1395e936121dSHans Petter Selasky 
1396fc271df3SHans Petter Selasky 	/* compute sequence bits which are constant */
1397fc271df3SHans Petter Selasky 	ones = 0;
1398fc271df3SHans Petter Selasky 	zeros = 0;
1399fc271df3SHans Petter Selasky 	for (x = 0; x != size; x++) {
1400fc271df3SHans Petter Selasky 		ones |= parray[x].seq;
1401fc271df3SHans Petter Selasky 		zeros |= ~parray[x].seq;
1402fc271df3SHans Petter Selasky 	}
1403fc271df3SHans Petter Selasky 
1404fc271df3SHans Petter Selasky 	/* compute bits which are not constant into "ones" */
1405fc271df3SHans Petter Selasky 	ones &= zeros;
1406fc271df3SHans Petter Selasky 	if (ones == 0)
1407fc271df3SHans Petter Selasky 		return;
1408fc271df3SHans Petter Selasky 
1409fc271df3SHans Petter Selasky 	/* pick the most significant bit which is not constant */
1410fc271df3SHans Petter Selasky 	ones = tcp_lro_msb_64(ones);
1411fc271df3SHans Petter Selasky 
1412fc271df3SHans Petter Selasky 	/*
1413fc271df3SHans Petter Selasky 	 * Move entries having cleared sequence bits to the beginning
1414fc271df3SHans Petter Selasky 	 * of the array:
1415fc271df3SHans Petter Selasky 	 */
1416fc271df3SHans Petter Selasky 	for (x = y = 0; y != size; y++) {
1417fc271df3SHans Petter Selasky 		/* skip set bits */
1418fc271df3SHans Petter Selasky 		if (parray[y].seq & ones)
1419fc271df3SHans Petter Selasky 			continue;
1420fc271df3SHans Petter Selasky 		/* swap entries */
1421fc271df3SHans Petter Selasky 		temp = parray[x];
1422fc271df3SHans Petter Selasky 		parray[x] = parray[y];
1423fc271df3SHans Petter Selasky 		parray[y] = temp;
1424fc271df3SHans Petter Selasky 		x++;
1425fc271df3SHans Petter Selasky 	}
1426fc271df3SHans Petter Selasky 
1427fc271df3SHans Petter Selasky 	KASSERT(x != 0 && x != size, ("Memory is corrupted\n"));
1428fc271df3SHans Petter Selasky 
1429fc271df3SHans Petter Selasky 	/* sort zeros */
1430fc271df3SHans Petter Selasky 	tcp_lro_sort(parray, x);
1431fc271df3SHans Petter Selasky 
1432fc271df3SHans Petter Selasky 	/* sort ones */
1433fc271df3SHans Petter Selasky 	parray += x;
1434fc271df3SHans Petter Selasky 	size -= x;
1435fc271df3SHans Petter Selasky 	goto repeat;
1436e936121dSHans Petter Selasky }
1437e936121dSHans Petter Selasky 
1438e936121dSHans Petter Selasky void
1439e936121dSHans Petter Selasky tcp_lro_flush_all(struct lro_ctrl *lc)
1440e936121dSHans Petter Selasky {
1441fc271df3SHans Petter Selasky 	uint64_t seq;
1442fc271df3SHans Petter Selasky 	uint64_t nseq;
1443e936121dSHans Petter Selasky 	unsigned x;
1444e936121dSHans Petter Selasky 
1445e936121dSHans Petter Selasky 	/* check if no mbufs to flush */
14466dd38b87SSepherosa Ziehau 	if (lc->lro_mbuf_count == 0)
1447e936121dSHans Petter Selasky 		goto done;
1448e936121dSHans Petter Selasky 
1449a9b66dbdSHans Petter Selasky 	CURVNET_SET(lc->ifp->if_vnet);
1450a9b66dbdSHans Petter Selasky 
14519ca874cfSHans Petter Selasky 	/* get current time */
1452*b45daaeaSRandall Stewart 	binuptime(&lc->lro_last_queue_time);
14539ca874cfSHans Petter Selasky 
1454e936121dSHans Petter Selasky 	/* sort all mbufs according to stream */
1455fc271df3SHans Petter Selasky 	tcp_lro_sort(lc->lro_mbuf_data, lc->lro_mbuf_count);
1456e936121dSHans Petter Selasky 
1457e936121dSHans Petter Selasky 	/* input data into LRO engine, stream by stream */
1458fc271df3SHans Petter Selasky 	seq = 0;
1459e936121dSHans Petter Selasky 	for (x = 0; x != lc->lro_mbuf_count; x++) {
1460e936121dSHans Petter Selasky 		struct mbuf *mb;
1461e936121dSHans Petter Selasky 
1462fc271df3SHans Petter Selasky 		/* get mbuf */
1463fc271df3SHans Petter Selasky 		mb = lc->lro_mbuf_data[x].mb;
1464fc271df3SHans Petter Selasky 
1465fc271df3SHans Petter Selasky 		/* get sequence number, masking away the packet index */
1466fc271df3SHans Petter Selasky 		nseq = lc->lro_mbuf_data[x].seq & (-1ULL << 24);
1467e936121dSHans Petter Selasky 
1468e936121dSHans Petter Selasky 		/* check for new stream */
1469fc271df3SHans Petter Selasky 		if (seq != nseq) {
1470fc271df3SHans Petter Selasky 			seq = nseq;
1471e936121dSHans Petter Selasky 
1472e936121dSHans Petter Selasky 			/* flush active streams */
14736dd38b87SSepherosa Ziehau 			tcp_lro_rx_done(lc);
1474e936121dSHans Petter Selasky 		}
1475fc271df3SHans Petter Selasky 
1476e936121dSHans Petter Selasky 		/* add packet to LRO engine */
14779ca874cfSHans Petter Selasky 		if (tcp_lro_rx_common(lc, mb, 0, false) != 0) {
1478e936121dSHans Petter Selasky 			/* input packet to network layer */
1479e936121dSHans Petter Selasky 			(*lc->ifp->if_input)(lc->ifp, mb);
1480e936121dSHans Petter Selasky 			lc->lro_queued++;
1481e936121dSHans Petter Selasky 			lc->lro_flushed++;
1482e936121dSHans Petter Selasky 		}
1483e936121dSHans Petter Selasky 	}
1484a9b66dbdSHans Petter Selasky 	CURVNET_RESTORE();
1485e936121dSHans Petter Selasky done:
1486e936121dSHans Petter Selasky 	/* flush active streams */
14876dd38b87SSepherosa Ziehau 	tcp_lro_rx_done(lc);
14886dd38b87SSepherosa Ziehau 
1489e936121dSHans Petter Selasky 	lc->lro_mbuf_count = 0;
149062b5b6ecSBjoern A. Zeeb }
14916c5087a8SJack F Vogel 
1492ab4fad4bSRandall Stewart #ifdef TCPHPTS
149369a34e8dSRandall Stewart static void
14949ca874cfSHans Petter Selasky build_ack_entry(struct tcp_ackent *ae, struct tcphdr *th, struct mbuf *m,
14959ca874cfSHans Petter Selasky     uint32_t *ts_ptr, uint16_t iptos)
149669a34e8dSRandall Stewart {
149769a34e8dSRandall Stewart 	/*
14989ca874cfSHans Petter Selasky 	 * Given a TCP ACK, summarize it down into the small TCP ACK
14999ca874cfSHans Petter Selasky 	 * entry.
150069a34e8dSRandall Stewart 	 */
150169a34e8dSRandall Stewart 	ae->timestamp = m->m_pkthdr.rcv_tstmp;
150269a34e8dSRandall Stewart 	if (m->m_flags & M_TSTMP_LRO)
150369a34e8dSRandall Stewart 		ae->flags = TSTMP_LRO;
150469a34e8dSRandall Stewart 	else if (m->m_flags & M_TSTMP)
150569a34e8dSRandall Stewart 		ae->flags = TSTMP_HDWR;
150669a34e8dSRandall Stewart 	ae->seq = ntohl(th->th_seq);
150769a34e8dSRandall Stewart 	ae->ack = ntohl(th->th_ack);
150869a34e8dSRandall Stewart 	ae->flags |= th->th_flags;
15099ca874cfSHans Petter Selasky 	if (ts_ptr != NULL) {
15109ca874cfSHans Petter Selasky 		ae->ts_value = ntohl(ts_ptr[1]);
15119ca874cfSHans Petter Selasky 		ae->ts_echo = ntohl(ts_ptr[2]);
151269a34e8dSRandall Stewart 		ae->flags |= HAS_TSTMP;
151369a34e8dSRandall Stewart 	}
151469a34e8dSRandall Stewart 	ae->win = ntohs(th->th_win);
151569a34e8dSRandall Stewart 	ae->codepoint = iptos;
151669a34e8dSRandall Stewart }
151769a34e8dSRandall Stewart 
151869a34e8dSRandall Stewart /*
15199ca874cfSHans Petter Selasky  * Do BPF tap for either ACK_CMP packets or MBUF QUEUE type packets
15209ca874cfSHans Petter Selasky  * and strip all, but the IPv4/IPv6 header.
152169a34e8dSRandall Stewart  */
15229ca874cfSHans Petter Selasky static bool
15239ca874cfSHans Petter Selasky do_bpf_strip_and_compress(struct inpcb *inp, struct lro_ctrl *lc,
15249ca874cfSHans Petter Selasky     struct lro_entry *le, struct mbuf **pp, struct mbuf **cmp, struct mbuf **mv_to,
15259ca874cfSHans Petter Selasky     bool *should_wake, bool bpf_req)
15269ca874cfSHans Petter Selasky {
15279ca874cfSHans Petter Selasky 	union {
15289ca874cfSHans Petter Selasky 		void *ptr;
15299ca874cfSHans Petter Selasky 		struct ip *ip4;
15309ca874cfSHans Petter Selasky 		struct ip6_hdr *ip6;
15319ca874cfSHans Petter Selasky 	} l3;
15329ca874cfSHans Petter Selasky 	struct mbuf *m;
15339ca874cfSHans Petter Selasky 	struct mbuf *nm;
153469a34e8dSRandall Stewart 	struct tcphdr *th;
15359ca874cfSHans Petter Selasky 	struct tcp_ackent *ack_ent;
15369ca874cfSHans Petter Selasky 	uint32_t *ts_ptr;
15379ca874cfSHans Petter Selasky 	int32_t n_mbuf;
15389ca874cfSHans Petter Selasky 	bool other_opts, can_compress;
15399ca874cfSHans Petter Selasky 	uint16_t lro_type;
15409ca874cfSHans Petter Selasky 	uint16_t iptos;
15419ca874cfSHans Petter Selasky 	int tcp_hdr_offset;
15429ca874cfSHans Petter Selasky 	int idx;
154369a34e8dSRandall Stewart 
15449ca874cfSHans Petter Selasky 	/* Get current mbuf. */
15459ca874cfSHans Petter Selasky 	m = *pp;
154669a34e8dSRandall Stewart 
154769a34e8dSRandall Stewart 	/* Let the BPF see the packet */
15489ca874cfSHans Petter Selasky 	if (__predict_false(bpf_req))
154969a34e8dSRandall Stewart 		ETHER_BPF_MTAP(lc->ifp, m);
15509ca874cfSHans Petter Selasky 
15519ca874cfSHans Petter Selasky 	tcp_hdr_offset = m->m_pkthdr.lro_tcp_h_off;
15529ca874cfSHans Petter Selasky 	lro_type = le->inner.data.lro_type;
15539ca874cfSHans Petter Selasky 	switch (lro_type) {
15549ca874cfSHans Petter Selasky 	case LRO_TYPE_NONE:
15559ca874cfSHans Petter Selasky 		lro_type = le->outer.data.lro_type;
15569ca874cfSHans Petter Selasky 		switch (lro_type) {
15579ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV4_TCP:
15589ca874cfSHans Petter Selasky 			tcp_hdr_offset -= sizeof(*le->outer.ip4);
15599ca874cfSHans Petter Selasky 			m->m_pkthdr.lro_etype = ETHERTYPE_IP;
15609ca874cfSHans Petter Selasky 			break;
15619ca874cfSHans Petter Selasky 		case LRO_TYPE_IPV6_TCP:
15629ca874cfSHans Petter Selasky 			tcp_hdr_offset -= sizeof(*le->outer.ip6);
15639ca874cfSHans Petter Selasky 			m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
15649ca874cfSHans Petter Selasky 			break;
15659ca874cfSHans Petter Selasky 		default:
15669ca874cfSHans Petter Selasky 			goto compressed;
15679ca874cfSHans Petter Selasky 		}
15689ca874cfSHans Petter Selasky 		break;
15699ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
15709ca874cfSHans Petter Selasky 		tcp_hdr_offset -= sizeof(*le->outer.ip4);
15719ca874cfSHans Petter Selasky 		m->m_pkthdr.lro_etype = ETHERTYPE_IP;
15729ca874cfSHans Petter Selasky 		break;
15739ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
15749ca874cfSHans Petter Selasky 		tcp_hdr_offset -= sizeof(*le->outer.ip6);
15759ca874cfSHans Petter Selasky 		m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
15769ca874cfSHans Petter Selasky 		break;
15779ca874cfSHans Petter Selasky 	default:
15789ca874cfSHans Petter Selasky 		goto compressed;
15799ca874cfSHans Petter Selasky 	}
15809ca874cfSHans Petter Selasky 
15819ca874cfSHans Petter Selasky 	MPASS(tcp_hdr_offset >= 0);
15829ca874cfSHans Petter Selasky 
15839ca874cfSHans Petter Selasky 	m_adj(m, tcp_hdr_offset);
158469a34e8dSRandall Stewart 	m->m_flags |= M_LRO_EHDRSTRP;
15859ca874cfSHans Petter Selasky 	m->m_flags &= ~M_ACKCMP;
15869ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_h_off -= tcp_hdr_offset;
158769a34e8dSRandall Stewart 
15889ca874cfSHans Petter Selasky 	th = tcp_lro_get_th(m);
158969a34e8dSRandall Stewart 
15909ca874cfSHans Petter Selasky 	th->th_sum = 0;		/* TCP checksum is valid. */
159169a34e8dSRandall Stewart 
15929ca874cfSHans Petter Selasky 	/* Check if ACK can be compressed */
15939ca874cfSHans Petter Selasky 	can_compress = tcp_lro_ack_valid(m, th, &ts_ptr, &other_opts);
159469a34e8dSRandall Stewart 
15959ca874cfSHans Petter Selasky 	/* Now lets look at the should wake states */
15969ca874cfSHans Petter Selasky 	if ((other_opts == true) &&
15979ca874cfSHans Petter Selasky 	    ((inp->inp_flags2 & INP_DONT_SACK_QUEUE) == 0)) {
159869a34e8dSRandall Stewart 		/*
15999ca874cfSHans Petter Selasky 		 * If there are other options (SACK?) and the
16009ca874cfSHans Petter Selasky 		 * tcp endpoint has not expressly told us it does
16019ca874cfSHans Petter Selasky 		 * not care about SACKS, then we should wake up.
160269a34e8dSRandall Stewart 		 */
16039ca874cfSHans Petter Selasky 		*should_wake = true;
160469a34e8dSRandall Stewart 	}
16059ca874cfSHans Petter Selasky 	/* Is the ack compressable? */
16069ca874cfSHans Petter Selasky 	if (can_compress == false)
16079ca874cfSHans Petter Selasky 		goto done;
16089ca874cfSHans Petter Selasky 	/* Does the TCP endpoint support ACK compression? */
16099ca874cfSHans Petter Selasky 	if ((inp->inp_flags2 & INP_MBUF_ACKCMP) == 0)
16109ca874cfSHans Petter Selasky 		goto done;
16119ca874cfSHans Petter Selasky 
16129ca874cfSHans Petter Selasky 	/* Lets get the TOS/traffic class field */
16139ca874cfSHans Petter Selasky 	l3.ptr = mtod(m, void *);
16149ca874cfSHans Petter Selasky 	switch (lro_type) {
16159ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
16169ca874cfSHans Petter Selasky 		iptos = l3.ip4->ip_tos;
16179ca874cfSHans Petter Selasky 		break;
16189ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV6_TCP:
16199ca874cfSHans Petter Selasky 		iptos = IPV6_TRAFFIC_CLASS(l3.ip6);
16209ca874cfSHans Petter Selasky 		break;
16219ca874cfSHans Petter Selasky 	default:
16229ca874cfSHans Petter Selasky 		iptos = 0;	/* Keep compiler happy. */
162369a34e8dSRandall Stewart 		break;
162469a34e8dSRandall Stewart 	}
16259ca874cfSHans Petter Selasky 	/* Now lets get space if we don't have some already */
16269ca874cfSHans Petter Selasky 	if (*cmp == NULL) {
16279ca874cfSHans Petter Selasky new_one:
16289ca874cfSHans Petter Selasky 		nm = tcp_lro_get_last_if_ackcmp(lc, le, inp, &n_mbuf);
16299ca874cfSHans Petter Selasky 		if (__predict_false(nm == NULL))
16309ca874cfSHans Petter Selasky 			goto done;
16319ca874cfSHans Petter Selasky 		*cmp = nm;
16329ca874cfSHans Petter Selasky 		if (n_mbuf) {
163369a34e8dSRandall Stewart 			/*
16349ca874cfSHans Petter Selasky 			 *  Link in the new cmp ack to our in-order place,
16359ca874cfSHans Petter Selasky 			 * first set our cmp ack's next to where we are.
163669a34e8dSRandall Stewart 			 */
16379ca874cfSHans Petter Selasky 			nm->m_nextpkt = m;
16389ca874cfSHans Petter Selasky 			(*pp) = nm;
16399ca874cfSHans Petter Selasky 			/*
16409ca874cfSHans Petter Selasky 			 * Set it up so mv_to is advanced to our
16419ca874cfSHans Petter Selasky 			 * compressed ack. This way the caller can
16429ca874cfSHans Petter Selasky 			 * advance pp to the right place.
16439ca874cfSHans Petter Selasky 			 */
16449ca874cfSHans Petter Selasky 			*mv_to = nm;
16459ca874cfSHans Petter Selasky 			/*
16469ca874cfSHans Petter Selasky 			 * Advance it here locally as well.
16479ca874cfSHans Petter Selasky 			 */
16489ca874cfSHans Petter Selasky 			pp = &nm->m_nextpkt;
164969a34e8dSRandall Stewart 		}
16509ca874cfSHans Petter Selasky 	} else {
16519ca874cfSHans Petter Selasky 		/* We have one already we are working on */
16529ca874cfSHans Petter Selasky 		nm = *cmp;
16539ca874cfSHans Petter Selasky 		if (M_TRAILINGSPACE(nm) < sizeof(struct tcp_ackent)) {
16549ca874cfSHans Petter Selasky 			/* We ran out of space */
16559ca874cfSHans Petter Selasky 			inp->inp_flags2 |= INP_MBUF_L_ACKS;
16569ca874cfSHans Petter Selasky 			goto new_one;
16579ca874cfSHans Petter Selasky 		}
16589ca874cfSHans Petter Selasky 	}
16599ca874cfSHans Petter Selasky 	MPASS(M_TRAILINGSPACE(nm) >= sizeof(struct tcp_ackent));
16609ca874cfSHans Petter Selasky 	counter_u64_add(tcp_inp_lro_compressed, 1);
16619ca874cfSHans Petter Selasky 	le->compressed++;
16629ca874cfSHans Petter Selasky 	/* We can add in to the one on the tail */
16639ca874cfSHans Petter Selasky 	ack_ent = mtod(nm, struct tcp_ackent *);
16649ca874cfSHans Petter Selasky 	idx = (nm->m_len / sizeof(struct tcp_ackent));
16659ca874cfSHans Petter Selasky 	build_ack_entry(&ack_ent[idx], th, m, ts_ptr, iptos);
166669a34e8dSRandall Stewart 
16679ca874cfSHans Petter Selasky 	/* Bump the size of both pkt-hdr and len */
16689ca874cfSHans Petter Selasky 	nm->m_len += sizeof(struct tcp_ackent);
16699ca874cfSHans Petter Selasky 	nm->m_pkthdr.len += sizeof(struct tcp_ackent);
16709ca874cfSHans Petter Selasky compressed:
16719ca874cfSHans Petter Selasky 	/* Advance to next mbuf before freeing. */
16729ca874cfSHans Petter Selasky 	*pp = m->m_nextpkt;
16739ca874cfSHans Petter Selasky 	m->m_nextpkt = NULL;
167469a34e8dSRandall Stewart 	m_freem(m);
16759ca874cfSHans Petter Selasky 	return (true);
16769ca874cfSHans Petter Selasky done:
16779ca874cfSHans Petter Selasky 	counter_u64_add(tcp_uncomp_total, 1);
16789ca874cfSHans Petter Selasky 	le->uncompressed++;
16799ca874cfSHans Petter Selasky 	return (false);
168069a34e8dSRandall Stewart }
168169a34e8dSRandall Stewart #endif
16829ca874cfSHans Petter Selasky 
16839ca874cfSHans Petter Selasky static struct lro_head *
16849ca874cfSHans Petter Selasky tcp_lro_rx_get_bucket(struct lro_ctrl *lc, struct mbuf *m, struct lro_parser *parser)
16859ca874cfSHans Petter Selasky {
16869ca874cfSHans Petter Selasky 	u_long hash;
16879ca874cfSHans Petter Selasky 
16889ca874cfSHans Petter Selasky 	if (M_HASHTYPE_ISHASH(m)) {
16899ca874cfSHans Petter Selasky 		hash = m->m_pkthdr.flowid;
16909ca874cfSHans Petter Selasky 	} else {
16919ca874cfSHans Petter Selasky 		for (unsigned i = hash = 0; i != LRO_RAW_ADDRESS_MAX; i++)
16929ca874cfSHans Petter Selasky 			hash += parser->data.raw[i];
169369a34e8dSRandall Stewart 	}
16949ca874cfSHans Petter Selasky 	return (&lc->lro_hash[hash % lc->lro_hashsz]);
16959ca874cfSHans Petter Selasky }
169669a34e8dSRandall Stewart 
169705cde7efSSepherosa Ziehau static int
16989ca874cfSHans Petter Selasky tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum, bool use_hash)
169962b5b6ecSBjoern A. Zeeb {
17009ca874cfSHans Petter Selasky 	struct lro_parser pi;	/* inner address data */
17019ca874cfSHans Petter Selasky 	struct lro_parser po;	/* outer address data */
17029ca874cfSHans Petter Selasky 	struct lro_parser *pa;	/* current parser for TCP stream */
170362b5b6ecSBjoern A. Zeeb 	struct lro_entry *le;
170405cde7efSSepherosa Ziehau 	struct lro_head *bucket;
17059ca874cfSHans Petter Selasky 	struct tcphdr *th;
17069ca874cfSHans Petter Selasky 	int tcp_data_len;
17079ca874cfSHans Petter Selasky 	int tcp_opt_len;
17089ca874cfSHans Petter Selasky 	int error;
17099ca874cfSHans Petter Selasky 	uint16_t tcp_data_sum;
17106c5087a8SJack F Vogel 
17119ca874cfSHans Petter Selasky #ifdef INET
17129ca874cfSHans Petter Selasky 	/* Quickly decide if packet cannot be LRO'ed */
17139ca874cfSHans Petter Selasky 	if (__predict_false(V_ipforwarding != 0))
17149ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
17159ca874cfSHans Petter Selasky #endif
17169ca874cfSHans Petter Selasky #ifdef INET6
17179ca874cfSHans Petter Selasky 	/* Quickly decide if packet cannot be LRO'ed */
17189ca874cfSHans Petter Selasky 	if (__predict_false(V_ip6_forwarding != 0))
17199ca874cfSHans Petter Selasky 		return (TCP_LRO_CANNOT);
17209ca874cfSHans Petter Selasky #endif
172169a34e8dSRandall Stewart 
172262b5b6ecSBjoern A. Zeeb 	/* We expect a contiguous header [eh, ip, tcp]. */
17239ca874cfSHans Petter Selasky 	pa = tcp_lro_parser(m, &po, &pi, true);
17249ca874cfSHans Petter Selasky 	if (__predict_false(pa == NULL))
17259ca874cfSHans Petter Selasky 		return (TCP_LRO_NOT_SUPPORTED);
17269ca874cfSHans Petter Selasky 
17279ca874cfSHans Petter Selasky 	/* We don't expect any padding. */
17289ca874cfSHans Petter Selasky 	error = tcp_lro_trim_mbuf_chain(m, pa);
17299ca874cfSHans Petter Selasky 	if (__predict_false(error != 0))
17309ca874cfSHans Petter Selasky 		return (error);
17319ca874cfSHans Petter Selasky 
17329ca874cfSHans Petter Selasky #ifdef INET
17339ca874cfSHans Petter Selasky 	switch (pa->data.lro_type) {
17349ca874cfSHans Petter Selasky 	case LRO_TYPE_IPV4_TCP:
17359ca874cfSHans Petter Selasky 		error = tcp_lro_rx_ipv4(lc, m, pa->ip4);
17369ca874cfSHans Petter Selasky 		if (__predict_false(error != 0))
17379ca874cfSHans Petter Selasky 			return (error);
17389ca874cfSHans Petter Selasky 		break;
17399ca874cfSHans Petter Selasky 	default:
17409ca874cfSHans Petter Selasky 		break;
17419ca874cfSHans Petter Selasky 	}
17429ca874cfSHans Petter Selasky #endif
17439ca874cfSHans Petter Selasky 	/* If no hardware or arrival stamp on the packet add timestamp */
1744e57b2d0eSRandall Stewart 	if ((m->m_flags & (M_TSTMP_LRO | M_TSTMP)) == 0) {
1745*b45daaeaSRandall Stewart 		m->m_pkthdr.rcv_tstmp = bintime2ns(&lc->lro_last_queue_time);
1746e57b2d0eSRandall Stewart 		m->m_flags |= M_TSTMP_LRO;
1747e57b2d0eSRandall Stewart 	}
17486c5087a8SJack F Vogel 
17499ca874cfSHans Petter Selasky 	/* Get pointer to TCP header. */
17509ca874cfSHans Petter Selasky 	th = pa->tcp;
17519ca874cfSHans Petter Selasky 
17529ca874cfSHans Petter Selasky 	/* Don't process SYN packets. */
17539ca874cfSHans Petter Selasky 	if (__predict_false(th->th_flags & TH_SYN))
175462b5b6ecSBjoern A. Zeeb 		return (TCP_LRO_CANNOT);
175562b5b6ecSBjoern A. Zeeb 
17569ca874cfSHans Petter Selasky 	/* Get total TCP header length and compute payload length. */
17579ca874cfSHans Petter Selasky 	tcp_opt_len = (th->th_off << 2);
17589ca874cfSHans Petter Selasky 	tcp_data_len = m->m_pkthdr.len - ((uint8_t *)th -
17599ca874cfSHans Petter Selasky 	    (uint8_t *)m->m_data) - tcp_opt_len;
17609ca874cfSHans Petter Selasky 	tcp_opt_len -= sizeof(*th);
17619ca874cfSHans Petter Selasky 
17629ca874cfSHans Petter Selasky 	/* Don't process invalid TCP headers. */
17639ca874cfSHans Petter Selasky 	if (__predict_false(tcp_opt_len < 0 || tcp_data_len < 0))
176462b5b6ecSBjoern A. Zeeb 		return (TCP_LRO_CANNOT);
17659ca874cfSHans Petter Selasky 
17669ca874cfSHans Petter Selasky 	/* Compute TCP data only checksum. */
17679ca874cfSHans Petter Selasky 	if (tcp_data_len == 0)
17689ca874cfSHans Petter Selasky 		tcp_data_sum = 0;	/* no data, no checksum */
17699ca874cfSHans Petter Selasky 	else if (__predict_false(csum != 0))
17709ca874cfSHans Petter Selasky 		tcp_data_sum = tcp_lro_rx_csum_data(pa, ~csum);
17719ca874cfSHans Petter Selasky 	else
17729ca874cfSHans Petter Selasky 		tcp_data_sum = tcp_lro_rx_csum_data(pa, ~th->th_sum);
17739ca874cfSHans Petter Selasky 
17749ca874cfSHans Petter Selasky 	/* Save TCP info in mbuf. */
17759ca874cfSHans Petter Selasky 	m->m_nextpkt = NULL;
17769ca874cfSHans Petter Selasky 	m->m_pkthdr.rcvif = lc->ifp;
17779ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_csum = tcp_data_sum;
17789ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_d_len = tcp_data_len;
17799ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_tcp_h_off = ((uint8_t *)th - (uint8_t *)m->m_data);
17809ca874cfSHans Petter Selasky 	m->m_pkthdr.lro_nsegs = 1;
17819ca874cfSHans Petter Selasky 
17829ca874cfSHans Petter Selasky 	/* Get hash bucket. */
178305cde7efSSepherosa Ziehau 	if (!use_hash) {
178405cde7efSSepherosa Ziehau 		bucket = &lc->lro_hash[0];
178505cde7efSSepherosa Ziehau 	} else {
17869ca874cfSHans Petter Selasky 		bucket = tcp_lro_rx_get_bucket(lc, m, pa);
178705cde7efSSepherosa Ziehau 	}
178805cde7efSSepherosa Ziehau 
178962b5b6ecSBjoern A. Zeeb 	/* Try to find a matching previous segment. */
179005cde7efSSepherosa Ziehau 	LIST_FOREACH(le, bucket, hash_next) {
17919ca874cfSHans Petter Selasky 		/* Compare addresses and ports. */
17929ca874cfSHans Petter Selasky 		if (lro_address_compare(&po.data, &le->outer.data) == false ||
17939ca874cfSHans Petter Selasky 		    lro_address_compare(&pi.data, &le->inner.data) == false)
179462b5b6ecSBjoern A. Zeeb 			continue;
17959ca874cfSHans Petter Selasky 
17969ca874cfSHans Petter Selasky 		/* Check if no data and old ACK. */
17979ca874cfSHans Petter Selasky 		if (tcp_data_len == 0 &&
17989ca874cfSHans Petter Selasky 		    SEQ_LT(ntohl(th->th_ack), ntohl(le->ack_seq))) {
1799d7fb35d1SSean Bruno 			m_freem(m);
1800d7fb35d1SSean Bruno 			return (0);
1801d7fb35d1SSean Bruno 		}
180269a34e8dSRandall Stewart 
18039ca874cfSHans Petter Selasky 		/* Mark "m" in the last spot. */
1804e57b2d0eSRandall Stewart 		le->m_last_mbuf->m_nextpkt = m;
18059ca874cfSHans Petter Selasky 		/* Now set the tail to "m". */
1806e57b2d0eSRandall Stewart 		le->m_last_mbuf = m;
180762b5b6ecSBjoern A. Zeeb 		return (0);
18086c5087a8SJack F Vogel 	}
18099ca874cfSHans Petter Selasky 
181062b5b6ecSBjoern A. Zeeb 	/* Try to find an empty slot. */
18111ea44822SSepherosa Ziehau 	if (LIST_EMPTY(&lc->lro_free))
1812489f0c3cSSepherosa Ziehau 		return (TCP_LRO_NO_ENTRIES);
181362b5b6ecSBjoern A. Zeeb 
181462b5b6ecSBjoern A. Zeeb 	/* Start a new segment chain. */
18151ea44822SSepherosa Ziehau 	le = LIST_FIRST(&lc->lro_free);
18161ea44822SSepherosa Ziehau 	LIST_REMOVE(le, next);
181705cde7efSSepherosa Ziehau 	tcp_lro_active_insert(lc, bucket, le);
181862b5b6ecSBjoern A. Zeeb 
18199ca874cfSHans Petter Selasky 	/* Make sure the headers are set. */
18209ca874cfSHans Petter Selasky 	le->inner = pi;
18219ca874cfSHans Petter Selasky 	le->outer = po;
182262b5b6ecSBjoern A. Zeeb 
18239ca874cfSHans Petter Selasky 	/* Store time this entry was allocated. */
18249ca874cfSHans Petter Selasky 	le->alloc_time = lc->lro_last_queue_time;
182569a34e8dSRandall Stewart 
18269ca874cfSHans Petter Selasky 	tcp_set_entry_to_mbuf(lc, le, m, th);
182769a34e8dSRandall Stewart 
18289ca874cfSHans Petter Selasky 	/* Now set the tail to "m". */
1829e57b2d0eSRandall Stewart 	le->m_last_mbuf = m;
18309ca874cfSHans Petter Selasky 
183162b5b6ecSBjoern A. Zeeb 	return (0);
183262b5b6ecSBjoern A. Zeeb }
183362b5b6ecSBjoern A. Zeeb 
183405cde7efSSepherosa Ziehau int
183505cde7efSSepherosa Ziehau tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum)
183605cde7efSSepherosa Ziehau {
18379ca874cfSHans Petter Selasky 	int error;
183805cde7efSSepherosa Ziehau 
18399ca874cfSHans Petter Selasky 	/* get current time */
1840*b45daaeaSRandall Stewart 	binuptime(&lc->lro_last_queue_time);
18419ca874cfSHans Petter Selasky 
18429ca874cfSHans Petter Selasky 	CURVNET_SET(lc->ifp->if_vnet);
18439ca874cfSHans Petter Selasky 	error = tcp_lro_rx_common(lc, m, csum, true);
18449ca874cfSHans Petter Selasky 	CURVNET_RESTORE();
18459ca874cfSHans Petter Selasky 
18469ca874cfSHans Petter Selasky 	return (error);
184705cde7efSSepherosa Ziehau }
184805cde7efSSepherosa Ziehau 
1849e936121dSHans Petter Selasky void
1850e936121dSHans Petter Selasky tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb)
1851e936121dSHans Petter Selasky {
1852e936121dSHans Petter Selasky 	/* sanity checks */
1853e936121dSHans Petter Selasky 	if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL ||
1854e936121dSHans Petter Selasky 	    lc->lro_mbuf_max == 0)) {
1855e936121dSHans Petter Selasky 		/* packet drop */
1856e936121dSHans Petter Selasky 		m_freem(mb);
1857e936121dSHans Petter Selasky 		return;
1858e936121dSHans Petter Selasky 	}
1859e936121dSHans Petter Selasky 
1860e936121dSHans Petter Selasky 	/* check if packet is not LRO capable */
1861e936121dSHans Petter Selasky 	if (__predict_false(mb->m_pkthdr.csum_flags == 0 ||
1862e936121dSHans Petter Selasky 	    (lc->ifp->if_capenable & IFCAP_LRO) == 0)) {
1863e936121dSHans Petter Selasky 		/* input packet to network layer */
1864e936121dSHans Petter Selasky 		(*lc->ifp->if_input) (lc->ifp, mb);
1865e936121dSHans Petter Selasky 		return;
1866e936121dSHans Petter Selasky 	}
1867e936121dSHans Petter Selasky 
1868fc271df3SHans Petter Selasky 	/* create sequence number */
1869fc271df3SHans Petter Selasky 	lc->lro_mbuf_data[lc->lro_mbuf_count].seq =
1870fc271df3SHans Petter Selasky 	    (((uint64_t)M_HASHTYPE_GET(mb)) << 56) |
1871fc271df3SHans Petter Selasky 	    (((uint64_t)mb->m_pkthdr.flowid) << 24) |
1872fc271df3SHans Petter Selasky 	    ((uint64_t)lc->lro_mbuf_count);
1873e936121dSHans Petter Selasky 
1874e936121dSHans Petter Selasky 	/* enter mbuf */
1875f8acc03eSNavdeep Parhar 	lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb;
1876f8acc03eSNavdeep Parhar 
1877f8acc03eSNavdeep Parhar 	/* flush if array is full */
1878f8acc03eSNavdeep Parhar 	if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max))
1879f8acc03eSNavdeep Parhar 		tcp_lro_flush_all(lc);
1880e936121dSHans Petter Selasky }
1881e936121dSHans Petter Selasky 
188262b5b6ecSBjoern A. Zeeb /* end */
1883