1 /*- 2 * Copyright (c) 2006, Myricom Inc. 3 * Copyright (c) 2008, Intel Corporation. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef _TCP_LRO_H_ 31 #define _TCP_LRO_H_ 32 33 struct lro_entry 34 { 35 SLIST_ENTRY(lro_entry) next; 36 struct mbuf *m_head; 37 struct mbuf *m_tail; 38 union { 39 struct ip *ip4; 40 struct ip6_hdr *ip6; 41 } leip; 42 union { 43 in_addr_t s_ip4; 44 struct in6_addr s_ip6; 45 } lesource; 46 union { 47 in_addr_t d_ip4; 48 struct in6_addr d_ip6; 49 } ledest; 50 uint16_t source_port; 51 uint16_t dest_port; 52 uint16_t eh_type; /* EthernetHeader type. */ 53 uint16_t append_cnt; 54 uint32_t p_len; /* IP header payload length. */ 55 uint32_t ulp_csum; /* TCP, etc. checksum. */ 56 uint32_t next_seq; /* tcp_seq */ 57 uint32_t ack_seq; /* tcp_seq */ 58 uint32_t tsval; 59 uint32_t tsecr; 60 uint16_t window; 61 uint16_t timestamp; /* flag, not a TCP hdr field. */ 62 }; 63 SLIST_HEAD(lro_head, lro_entry); 64 65 #define le_ip4 leip.ip4 66 #define le_ip6 leip.ip6 67 #define source_ip4 lesource.s_ip4 68 #define dest_ip4 ledest.d_ip4 69 #define source_ip6 lesource.s_ip6 70 #define dest_ip6 ledest.d_ip6 71 72 /* NB: This is part of driver structs. */ 73 struct lro_ctrl { 74 struct ifnet *ifp; 75 int lro_queued; 76 int lro_flushed; 77 int lro_bad_csum; 78 int lro_cnt; 79 80 struct lro_head lro_active; 81 struct lro_head lro_free; 82 }; 83 84 int tcp_lro_init(struct lro_ctrl *); 85 void tcp_lro_free(struct lro_ctrl *); 86 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *); 87 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t); 88 89 #define TCP_LRO_CANNOT -1 90 #define TCP_LRO_NOT_SUPPORTED 1 91 92 #endif /* _TCP_LRO_H_ */ 93