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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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
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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
65 uint16_t lro_type; /* internal */
66 #define LRO_TYPE_NONE 0
67 #define LRO_TYPE_IPV4_TCP 1
68 #define LRO_TYPE_IPV6_TCP 2
69 #define LRO_TYPE_IPV4_UDP 3
70 #define LRO_TYPE_IPV6_UDP 4
71 uint16_t vlan_id; /* VLAN identifier */
72 uint16_t s_port; /* source TCP/UDP port */
73 uint16_t d_port; /* destination TCP/UDP port */
74 uint32_t vxlan_vni; /* VXLAN virtual network identifier */
82 } s_addr; /* source IPv4/IPv6 address */
90 } d_addr; /* destination IPv4/IPv6 address */
92 } __aligned(sizeof(u_long));
94 #define LRO_RAW_ADDRESS_MAX \
95 (sizeof(union lro_address) / sizeof(u_long))
97 /* Optimize address comparison by comparing one unsigned long at a time: */
100 lro_address_compare(const union lro_address *pa, const union lro_address *pb)
102 if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) {
104 } else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) {
105 if (pa->raw[i] != pb->raw[i])
112 union lro_address data;
123 uint16_t total_hdr_len;
126 /* This structure is zeroed frequently, try to keep it small. */
128 LIST_ENTRY(lro_entry) next;
129 LIST_ENTRY(lro_entry) hash_next;
132 struct mbuf *m_last_mbuf;
133 struct lro_parser outer;
134 struct lro_parser inner;
135 uint32_t next_seq; /* tcp_seq */
136 uint32_t ack_seq; /* tcp_seq */
140 uint16_t uncompressed;
142 uint16_t timestamp; /* flag, not a TCP hdr field. */
143 struct bintime alloc_time; /* time when entry was allocated */
146 LIST_HEAD(lro_head, lro_entry);
148 struct lro_mbuf_sort {
153 /* NB: This is part of driver structs. */
156 struct lro_mbuf_sort *lro_mbuf_data;
157 struct bintime lro_last_queue_time; /* last time data was queued */
159 uint64_t lro_flushed;
160 uint64_t lro_bad_csum;
162 unsigned lro_mbuf_count;
163 unsigned lro_mbuf_max;
164 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
165 unsigned lro_length_lim; /* max len of aggregated data */
168 struct lro_head *lro_hash;
169 struct lro_head lro_active;
170 struct lro_head lro_free;
174 uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
175 uint32_t seq; /* th_seq value */
176 uint32_t ack; /* th_ack value */
177 uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
178 uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
179 uint16_t win; /* TCP window */
180 uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
181 uint8_t codepoint; /* IP level codepoint including ECN bits */
182 uint8_t ack_val_set; /* Classification of ack used by the stack */
183 uint8_t pad[2]; /* To 32 byte boundary */
186 /* We use two M_PROTO on the mbuf */
187 #define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
188 #define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
190 #define TCP_LRO_LENGTH_MAX (65535 - 255) /* safe value with room for outer headers */
191 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
193 int tcp_lro_init(struct lro_ctrl *);
194 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
195 void tcp_lro_free(struct lro_ctrl *);
196 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
197 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
198 void tcp_lro_flush_all(struct lro_ctrl *);
199 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
200 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
201 void tcp_lro_reg_mbufq(void);
202 void tcp_lro_dereg_mbufq(void);
204 #define TCP_LRO_NO_ENTRIES -2
205 #define TCP_LRO_CANNOT -1
206 #define TCP_LRO_NOT_SUPPORTED 1
208 #endif /* _TCP_LRO_H_ */