2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006, Myricom Inc.
5 * Copyright (c) 2008, Intel Corporation.
6 * Copyright (c) 2016-2021 Mellanox Technologies.
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10 * modification, are permitted provided that the following conditions
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14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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38 #ifndef TCP_LRO_ENTRIES
39 /* Define default number of LRO entries per RX queue */
40 #define TCP_LRO_ENTRIES 8
44 * Flags for ACK entry for compression
45 * the bottom 8 bits has the th_flags.
46 * LRO itself adds only the TSTMP flags
47 * to indicate if either of the types
48 * of timestamps are filled and the
49 * HAS_TSTMP option to indicate if the
50 * TCP timestamp option is valid.
52 * The other 5 flag bits are for processing
56 #define TSTMP_LRO 0x0100
57 #define TSTMP_HDWR 0x0200
58 #define HAS_TSTMP 0x0400
60 * Default number of interrupts on the same cpu in a row
61 * that will cause us to declare a "affinity cpu".
63 #define TCP_LRO_CPU_DECLARATION_THRESH 50
70 uint16_t lro_type; /* internal */
71 #define LRO_TYPE_NONE 0
72 #define LRO_TYPE_IPV4_TCP 1
73 #define LRO_TYPE_IPV6_TCP 2
74 #define LRO_TYPE_IPV4_UDP 3
75 #define LRO_TYPE_IPV6_UDP 4
76 uint16_t vlan_id; /* VLAN identifier */
77 uint16_t s_port; /* source TCP/UDP port */
78 uint16_t d_port; /* destination TCP/UDP port */
79 uint32_t vxlan_vni; /* VXLAN virtual network identifier */
87 } s_addr; /* source IPv4/IPv6 address */
95 } d_addr; /* destination IPv4/IPv6 address */
97 } __aligned(sizeof(u_long));
99 #define LRO_RAW_ADDRESS_MAX \
100 (sizeof(union lro_address) / sizeof(u_long))
102 /* Optimize address comparison by comparing one unsigned long at a time: */
105 lro_address_compare(const union lro_address *pa, const union lro_address *pb)
107 if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) {
109 } else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) {
110 if (pa->raw[i] != pb->raw[i])
117 union lro_address data;
128 uint16_t total_hdr_len;
131 /* This structure is zeroed frequently, try to keep it small. */
133 LIST_ENTRY(lro_entry) next;
134 LIST_ENTRY(lro_entry) hash_next;
137 struct mbuf *m_last_mbuf;
138 struct lro_parser outer;
139 struct lro_parser inner;
140 uint32_t next_seq; /* tcp_seq */
141 uint32_t ack_seq; /* tcp_seq */
145 uint16_t uncompressed;
147 uint16_t timestamp; /* flag, not a TCP hdr field. */
148 struct bintime alloc_time; /* time when entry was allocated */
151 LIST_HEAD(lro_head, lro_entry);
153 struct lro_mbuf_sort {
158 /* NB: This is part of driver structs. */
161 struct lro_mbuf_sort *lro_mbuf_data;
162 struct bintime lro_last_queue_time; /* last time data was queued */
164 uint64_t lro_flushed;
165 uint64_t lro_bad_csum;
167 unsigned lro_mbuf_count;
168 unsigned lro_mbuf_max;
169 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
170 unsigned short lro_cpu; /* Guess at the cpu we have affinity too */
171 unsigned lro_length_lim; /* max len of aggregated data */
173 uint32_t lro_last_cpu;
174 uint32_t lro_cnt_of_same_cpu;
175 struct lro_head *lro_hash;
176 struct lro_head lro_active;
177 struct lro_head lro_free;
178 uint8_t lro_cpu_is_set; /* Flag to say its ok to set the CPU on the inp */
182 uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
183 uint32_t seq; /* th_seq value */
184 uint32_t ack; /* th_ack value */
185 uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
186 uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
187 uint16_t win; /* TCP window */
188 uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
189 uint8_t codepoint; /* IP level codepoint including ECN bits */
190 uint8_t ack_val_set; /* Classification of ack used by the stack */
191 uint8_t pad[2]; /* To 32 byte boundary */
194 /* We use two M_PROTO on the mbuf */
195 #define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
196 #define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
198 #define TCP_LRO_LENGTH_MAX (65535 - 255) /* safe value with room for outer headers */
199 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
201 int tcp_lro_init(struct lro_ctrl *);
202 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
203 void tcp_lro_free(struct lro_ctrl *);
204 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
205 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
206 void tcp_lro_flush_all(struct lro_ctrl *);
207 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
208 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
209 void tcp_lro_reg_mbufq(void);
210 void tcp_lro_dereg_mbufq(void);
212 #define TCP_LRO_NO_ENTRIES -2
213 #define TCP_LRO_CANNOT -1
214 #define TCP_LRO_NOT_SUPPORTED 1
216 #endif /* _TCP_LRO_H_ */