2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006, Myricom Inc.
5 * Copyright (c) 2008, Intel Corporation.
6 * Copyright (c) 2016 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
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16 * documentation and/or other materials provided with the distribution.
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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 /* Flags in LRO entry */
61 #define CAN_USE_ACKCMP 0x0001
62 #define HAS_COMP_ENTRIES 0x0002
67 LIST_ENTRY(lro_entry) next;
68 LIST_ENTRY(lro_entry) hash_next;
71 struct mbuf *m_last_mbuf;
72 struct mbuf *m_prev_last;
80 struct in6_addr s_ip6;
84 struct in6_addr d_ip6;
88 uint16_t eh_type; /* EthernetHeader type. */
90 uint32_t p_len; /* IP header payload length. */
91 uint32_t ulp_csum; /* TCP, etc. checksum. */
92 uint32_t next_seq; /* tcp_seq */
93 uint32_t ack_seq; /* tcp_seq */
96 uint32_t tcp_tot_p_len; /* TCP payload length of chain */
98 uint16_t timestamp; /* flag, not a TCP hdr field. */
100 uint16_t mbuf_cnt; /* Count of mbufs collected see note */
101 uint16_t mbuf_appended;
102 uint16_t cmp_ack_cnt;
105 struct timeval mtime;
108 * Note: The mbuf_cnt field tracks our number of mbufs added to the m_next
109 * list. Each mbuf counted can have data and of course it will
110 * have an ack as well (by defintion any inbound tcp segment will
111 * have an ack value. We use this count to tell us how many ACK's
112 * are present for our ack-count threshold. If we exceed that or
113 * the data threshold we will wake up the endpoint.
115 LIST_HEAD(lro_head, lro_entry);
117 #define le_ip4 leip.ip4
118 #define le_ip6 leip.ip6
119 #define source_ip4 lesource.s_ip4
120 #define dest_ip4 ledest.d_ip4
121 #define source_ip6 lesource.s_ip6
122 #define dest_ip6 ledest.d_ip6
124 struct lro_mbuf_sort {
129 /* NB: This is part of driver structs. */
132 struct lro_mbuf_sort *lro_mbuf_data;
133 struct timeval lro_last_flush;
135 uint64_t lro_flushed;
136 uint64_t lro_bad_csum;
138 unsigned lro_mbuf_count;
139 unsigned lro_mbuf_max;
140 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
141 unsigned lro_length_lim; /* max len of aggregated data */
144 struct lro_head *lro_hash;
145 struct lro_head lro_active;
146 struct lro_head lro_free;
150 uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
151 uint32_t seq; /* th_seq value */
152 uint32_t ack; /* th_ack value */
153 uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
154 uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
155 uint16_t win; /* TCP window */
156 uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
157 uint8_t codepoint; /* IP level codepoint including ECN bits */
158 uint8_t ack_val_set; /* Classification of ack used by the stack */
159 uint8_t pad[2]; /* To 32 byte boundary */
162 /* We use two M_PROTO on the mbuf */
163 #define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
164 #define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
166 #define TCP_LRO_LENGTH_MAX 65535
167 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
169 int tcp_lro_init(struct lro_ctrl *);
170 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
171 void tcp_lro_free(struct lro_ctrl *);
172 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
173 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
174 void tcp_lro_flush_all(struct lro_ctrl *);
175 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
176 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
177 void tcp_lro_reg_mbufq(void);
178 void tcp_lro_dereg_mbufq(void);
180 #define TCP_LRO_NO_ENTRIES -2
181 #define TCP_LRO_CANNOT -1
182 #define TCP_LRO_NOT_SUPPORTED 1
184 #endif /* _TCP_LRO_H_ */