/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2006, Myricom Inc. * Copyright (c) 2008, Intel Corporation. * Copyright (c) 2016-2021 Mellanox Technologies. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _TCP_LRO_H_ #define _TCP_LRO_H_ #include #include #include #include #ifndef TCP_LRO_ENTRIES /* Define default number of LRO entries per RX queue */ #define TCP_LRO_ENTRIES 8 #endif /* * Flags for ACK entry for compression * the bottom 12 bits has the th_x2|th_flags. * LRO itself adds only the TSTMP flags * to indicate if either of the types * of timestamps are filled and the * HAS_TSTMP option to indicate if the * TCP timestamp option is valid. * * The other 1 flag bits are for processing * by a stack. * */ #define TSTMP_LRO 0x1000 #define TSTMP_HDWR 0x2000 #define HAS_TSTMP 0x4000 /* * Default number of interrupts on the same cpu in a row * that will cause us to declare a "affinity cpu". */ #define TCP_LRO_CPU_DECLARATION_THRESH 50 struct inpcb; /* Precompute the LRO_RAW_ADDRESS_MAX value: */ #define LRO_RAW_ADDRESS_MAX \ howmany(12 + 2 * sizeof(struct in6_addr), sizeof(u_long)) union lro_address { u_long raw[LRO_RAW_ADDRESS_MAX]; struct { uint8_t lro_type; /* internal */ #define LRO_TYPE_NONE 0 #define LRO_TYPE_IPV4_TCP 1 #define LRO_TYPE_IPV6_TCP 2 #define LRO_TYPE_IPV4_UDP 3 #define LRO_TYPE_IPV6_UDP 4 uint8_t lro_flags; #define LRO_FLAG_DECRYPTED 1 uint16_t vlan_id; /* VLAN identifier */ uint16_t s_port; /* source TCP/UDP port */ uint16_t d_port; /* destination TCP/UDP port */ uint32_t vxlan_vni; /* VXLAN virtual network identifier */ union { struct in_addr v4; struct in6_addr v6; } s_addr; /* source IPv4/IPv6 address */ union { struct in_addr v4; struct in6_addr v6; } d_addr; /* destination IPv4/IPv6 address */ }; }; _Static_assert(sizeof(union lro_address) == sizeof(u_long) * LRO_RAW_ADDRESS_MAX, "The raw field in the lro_address union does not cover the whole structure."); /* Optimize address comparison by comparing one unsigned long at a time: */ static inline bool lro_address_compare(const union lro_address *pa, const union lro_address *pb) { if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) { return (true); } else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) { if (pa->raw[i] != pb->raw[i]) return (false); } return (true); } struct lro_parser { union lro_address data; union { uint8_t *l3; struct ip *ip4; struct ip6_hdr *ip6; }; union { uint8_t *l4; struct tcphdr *tcp; struct udphdr *udp; }; uint16_t total_hdr_len; }; /* This structure is zeroed frequently, try to keep it small. */ struct lro_entry { LIST_ENTRY(lro_entry) next; LIST_ENTRY(lro_entry) hash_next; struct mbuf *m_head; struct mbuf *m_tail; struct mbuf *m_last_mbuf; struct lro_parser outer; struct lro_parser inner; uint32_t next_seq; /* tcp_seq */ uint32_t ack_seq; /* tcp_seq */ uint32_t tsval; uint32_t tsecr; uint16_t compressed; uint16_t uncompressed; uint16_t window; uint16_t flags : 12, /* 12 TCP header bits */ timestamp : 1, needs_merge : 1, reserved : 2; /* unused */ struct bintime alloc_time; /* time when entry was allocated */ }; LIST_HEAD(lro_head, lro_entry); struct lro_mbuf_sort { uint64_t seq; struct mbuf *mb; }; /* NB: This is part of driver structs. */ struct lro_ctrl { struct ifnet *ifp; struct lro_mbuf_sort *lro_mbuf_data; struct bintime lro_last_queue_time; /* last time data was queued */ uint64_t lro_queued; uint64_t lro_flushed; uint64_t lro_bad_csum; unsigned lro_cnt; unsigned lro_mbuf_count; unsigned lro_mbuf_max; unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */ unsigned short lro_cpu; /* Guess at the cpu we have affinity too */ unsigned lro_length_lim; /* max len of aggregated data */ u_long lro_hashsz; uint32_t lro_last_cpu; uint32_t lro_cnt_of_same_cpu; struct lro_head *lro_hash; struct lro_head lro_active; struct lro_head lro_free; uint8_t lro_cpu_is_set; /* Flag to say its ok to set the CPU on the inp */ }; struct tcp_ackent { uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */ uint32_t seq; /* th_seq value */ uint32_t ack; /* th_ack value */ uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */ uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */ uint16_t win; /* TCP window */ uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */ uint8_t codepoint; /* IP level codepoint including ECN bits */ uint8_t ack_val_set; /* Classification of ack used by the stack */ uint8_t pad[2]; /* To 32 byte boundary */ }; /* We use two M_PROTO on the mbuf */ #define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */ #define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */ #define TCP_LRO_LENGTH_MAX (65535 - 255) /* safe value with room for outer headers */ #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */ #define TCP_LRO_TS_OPTION ntohl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |\ (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP) static inline struct tcphdr * tcp_lro_get_th(struct mbuf *m) { return ((struct tcphdr *)((char *)m->m_data + m->m_pkthdr.lro_tcp_h_off)); } extern long tcplro_stacks_wanting_mbufq; int tcp_lro_init(struct lro_ctrl *); int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned); void tcp_lro_free(struct lro_ctrl *); void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *); void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *); void tcp_lro_flush_all(struct lro_ctrl *); extern int (*tcp_lro_flush_tcphpts)(struct lro_ctrl *, struct lro_entry *); int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t); void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *); void tcp_lro_reg_mbufq(void); void tcp_lro_dereg_mbufq(void); #define TCP_LRO_NO_ENTRIES -2 #define TCP_LRO_CANNOT -1 #define TCP_LRO_NOT_SUPPORTED 1 #endif /* _TCP_LRO_H_ */