The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_lro.h

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    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: stable/10/sys/netinet/tcp_lro.h 301949 2016-06-16 04:21:27Z sephe $
   28  */
   29 
   30 #ifndef _TCP_LRO_H_
   31 #define _TCP_LRO_H_
   32 
   33 #include <sys/time.h>
   34 
   35 struct lro_entry
   36 {
   37         SLIST_ENTRY(lro_entry)  next;
   38         struct mbuf             *m_head;
   39         struct mbuf             *m_tail;
   40         union {
   41                 struct ip       *ip4;
   42                 struct ip6_hdr  *ip6;
   43         } leip;
   44         union {
   45                 in_addr_t       s_ip4;
   46                 struct in6_addr s_ip6;
   47         } lesource;
   48         union {
   49                 in_addr_t       d_ip4;
   50                 struct in6_addr d_ip6;
   51         } ledest;
   52         uint16_t                source_port;
   53         uint16_t                dest_port;
   54         uint16_t                eh_type;        /* EthernetHeader type. */
   55         uint16_t                append_cnt;
   56         uint32_t                p_len;          /* IP header payload length. */
   57         uint32_t                ulp_csum;       /* TCP, etc. checksum. */
   58         uint32_t                next_seq;       /* tcp_seq */
   59         uint32_t                ack_seq;        /* tcp_seq */
   60         uint32_t                tsval;
   61         uint32_t                tsecr;
   62         uint16_t                window;
   63         uint16_t                timestamp;      /* flag, not a TCP hdr field. */
   64         struct timeval          mtime;
   65 };
   66 SLIST_HEAD(lro_head, lro_entry);
   67 
   68 #define le_ip4                  leip.ip4
   69 #define le_ip6                  leip.ip6
   70 #define source_ip4              lesource.s_ip4
   71 #define dest_ip4                ledest.d_ip4
   72 #define source_ip6              lesource.s_ip6
   73 #define dest_ip6                ledest.d_ip6
   74 
   75 /* NB: This is part of driver structs. */
   76 struct lro_ctrl {
   77         struct ifnet    *ifp;
   78         int             lro_queued;
   79         int             lro_flushed;
   80         int             lro_bad_csum;
   81         int             lro_cnt;
   82 
   83         struct lro_head lro_active;
   84         struct lro_head lro_free;
   85 };
   86 
   87 int tcp_lro_init(struct lro_ctrl *);
   88 void tcp_lro_free(struct lro_ctrl *);
   89 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
   90 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
   91 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
   92 
   93 #define TCP_LRO_NO_ENTRIES      -2
   94 #define TCP_LRO_CANNOT          -1
   95 #define TCP_LRO_NOT_SUPPORTED   1
   96 
   97 #endif /* _TCP_LRO_H_ */

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