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 
    3 Copyright (c) 2006, Myricom Inc.
    4 Copyright (c) 2008, Intel Corporation.
    5 All rights reserved.
    6 
    7 Redistribution and use in source and binary forms, with or without
    8 modification, are permitted provided that the following conditions are met:
    9 
   10  1. Redistributions of source code must retain the above copyright notice,
   11     this list of conditions and the following disclaimer.
   12 
   13  2. Neither the name of the Myricom Inc, nor the names of its
   14     contributors may be used to endorse or promote products derived from
   15     this software without specific prior written permission.
   16 
   17  2. Neither the name of the Intel Corporation, nor the names of its
   18     contributors may be used to endorse or promote products derived from
   19     this software without specific prior written permission.
   20 
   21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   22 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   25 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   26 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   27 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   29 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   30 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   31 POSSIBILITY OF SUCH DAMAGE.
   32 
   33 
   34 $FreeBSD$
   35 
   36 ***************************************************************************/
   37 #ifndef _TCP_LRO_H_
   38 #define _TCP_LRO_H_
   39 
   40 struct lro_entry;
   41 struct lro_entry
   42 {
   43         SLIST_ENTRY(lro_entry) next;
   44         struct mbuf     *m_head;
   45         struct mbuf     *m_tail;
   46         int             timestamp;
   47         struct ip       *ip;
   48         uint32_t        tsval;
   49         uint32_t        tsecr;
   50         uint32_t        source_ip;
   51         uint32_t        dest_ip;
   52         uint32_t        next_seq;
   53         uint32_t        ack_seq;
   54         uint32_t        len;
   55         uint32_t        data_csum;
   56         uint16_t        window;
   57         uint16_t        source_port;
   58         uint16_t        dest_port;
   59         uint16_t        append_cnt;
   60         uint16_t        mss;
   61         
   62 };
   63 SLIST_HEAD(lro_head, lro_entry);
   64 
   65 struct lro_ctrl {
   66         struct ifnet    *ifp;
   67         int             lro_queued;
   68         int             lro_flushed;
   69         int             lro_bad_csum;
   70         int             lro_cnt;
   71 
   72         struct lro_head lro_active;
   73         struct lro_head lro_free;
   74 };
   75 
   76 
   77 int tcp_lro_init(struct lro_ctrl *);
   78 void tcp_lro_free(struct lro_ctrl *);
   79 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
   80 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
   81 
   82 /* Number of LRO entries - these are per rx queue */
   83 #define LRO_ENTRIES                     8
   84 
   85 #endif /* _TCP_LRO_H_ */

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