FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_lro.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006, Myricom Inc.
5 * Copyright (c) 2008, Intel Corporation.
6 * Copyright (c) 2016-2021 Mellanox Technologies.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33 #ifndef _TCP_LRO_H_
34 #define _TCP_LRO_H_
35
36 #include <sys/time.h>
37 #include <sys/param.h>
38
39 #include <netinet/in.h>
40
41 #ifndef TCP_LRO_ENTRIES
42 /* Define default number of LRO entries per RX queue */
43 #define TCP_LRO_ENTRIES 8
44 #endif
45
46 /*
47 * Flags for ACK entry for compression
48 * the bottom 12 bits has the th_x2|th_flags.
49 * LRO itself adds only the TSTMP flags
50 * to indicate if either of the types
51 * of timestamps are filled and the
52 * HAS_TSTMP option to indicate if the
53 * TCP timestamp option is valid.
54 *
55 * The other 1 flag bits are for processing
56 * by a stack.
57 *
58 */
59 #define TSTMP_LRO 0x1000
60 #define TSTMP_HDWR 0x2000
61 #define HAS_TSTMP 0x4000
62 /*
63 * Default number of interrupts on the same cpu in a row
64 * that will cause us to declare a "affinity cpu".
65 */
66 #define TCP_LRO_CPU_DECLARATION_THRESH 50
67
68 struct inpcb;
69
70 /* Precompute the LRO_RAW_ADDRESS_MAX value: */
71 #define LRO_RAW_ADDRESS_MAX \
72 howmany(12 + 2 * sizeof(struct in6_addr), sizeof(u_long))
73
74 union lro_address {
75 u_long raw[LRO_RAW_ADDRESS_MAX];
76 struct {
77 uint8_t lro_type; /* internal */
78 #define LRO_TYPE_NONE 0
79 #define LRO_TYPE_IPV4_TCP 1
80 #define LRO_TYPE_IPV6_TCP 2
81 #define LRO_TYPE_IPV4_UDP 3
82 #define LRO_TYPE_IPV6_UDP 4
83 uint8_t lro_flags;
84 #define LRO_FLAG_DECRYPTED 1
85 uint16_t vlan_id; /* VLAN identifier */
86 uint16_t s_port; /* source TCP/UDP port */
87 uint16_t d_port; /* destination TCP/UDP port */
88 uint32_t vxlan_vni; /* VXLAN virtual network identifier */
89 union {
90 struct in_addr v4;
91 struct in6_addr v6;
92 } s_addr; /* source IPv4/IPv6 address */
93 union {
94 struct in_addr v4;
95 struct in6_addr v6;
96 } d_addr; /* destination IPv4/IPv6 address */
97 };
98 };
99
100 _Static_assert(sizeof(union lro_address) == sizeof(u_long) * LRO_RAW_ADDRESS_MAX,
101 "The raw field in the lro_address union does not cover the whole structure.");
102
103 /* Optimize address comparison by comparing one unsigned long at a time: */
104
105 static inline bool
106 lro_address_compare(const union lro_address *pa, const union lro_address *pb)
107 {
108 if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) {
109 return (true);
110 } else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) {
111 if (pa->raw[i] != pb->raw[i])
112 return (false);
113 }
114 return (true);
115 }
116
117 struct lro_parser {
118 union lro_address data;
119 union {
120 uint8_t *l3;
121 struct ip *ip4;
122 struct ip6_hdr *ip6;
123 };
124 union {
125 uint8_t *l4;
126 struct tcphdr *tcp;
127 struct udphdr *udp;
128 };
129 uint16_t total_hdr_len;
130 };
131
132 /* This structure is zeroed frequently, try to keep it small. */
133 struct lro_entry {
134 LIST_ENTRY(lro_entry) next;
135 LIST_ENTRY(lro_entry) hash_next;
136 struct mbuf *m_head;
137 struct mbuf *m_tail;
138 struct mbuf *m_last_mbuf;
139 struct lro_parser outer;
140 struct lro_parser inner;
141 uint32_t next_seq; /* tcp_seq */
142 uint32_t ack_seq; /* tcp_seq */
143 uint32_t tsval;
144 uint32_t tsecr;
145 uint16_t compressed;
146 uint16_t uncompressed;
147 uint16_t window;
148 uint16_t flags : 12, /* 12 TCP header bits */
149 timestamp : 1,
150 needs_merge : 1,
151 reserved : 2; /* unused */
152 struct bintime alloc_time; /* time when entry was allocated */
153 };
154
155 LIST_HEAD(lro_head, lro_entry);
156
157 struct lro_mbuf_sort {
158 uint64_t seq;
159 struct mbuf *mb;
160 };
161
162 /* NB: This is part of driver structs. */
163 struct lro_ctrl {
164 struct ifnet *ifp;
165 struct lro_mbuf_sort *lro_mbuf_data;
166 struct bintime lro_last_queue_time; /* last time data was queued */
167 uint64_t lro_queued;
168 uint64_t lro_flushed;
169 uint64_t lro_bad_csum;
170 unsigned lro_cnt;
171 unsigned lro_mbuf_count;
172 unsigned lro_mbuf_max;
173 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
174 unsigned short lro_cpu; /* Guess at the cpu we have affinity too */
175 unsigned lro_length_lim; /* max len of aggregated data */
176 u_long lro_hashsz;
177 uint32_t lro_last_cpu;
178 uint32_t lro_cnt_of_same_cpu;
179 struct lro_head *lro_hash;
180 struct lro_head lro_active;
181 struct lro_head lro_free;
182 uint8_t lro_cpu_is_set; /* Flag to say its ok to set the CPU on the inp */
183 };
184
185 struct tcp_ackent {
186 uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
187 uint32_t seq; /* th_seq value */
188 uint32_t ack; /* th_ack value */
189 uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
190 uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
191 uint16_t win; /* TCP window */
192 uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
193 uint8_t codepoint; /* IP level codepoint including ECN bits */
194 uint8_t ack_val_set; /* Classification of ack used by the stack */
195 uint8_t pad[2]; /* To 32 byte boundary */
196 };
197
198 /* We use two M_PROTO on the mbuf */
199 #define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
200 #define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
201
202 #define TCP_LRO_LENGTH_MAX (65535 - 255) /* safe value with room for outer headers */
203 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
204
205 int tcp_lro_init(struct lro_ctrl *);
206 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
207 void tcp_lro_free(struct lro_ctrl *);
208 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
209 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
210 void tcp_lro_flush_all(struct lro_ctrl *);
211 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
212 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
213 void tcp_lro_reg_mbufq(void);
214 void tcp_lro_dereg_mbufq(void);
215
216 #define TCP_LRO_NO_ENTRIES -2
217 #define TCP_LRO_CANNOT -1
218 #define TCP_LRO_NOT_SUPPORTED 1
219
220 #endif /* _TCP_LRO_H_ */
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