xref: /freebsd-10.1-release/sys/netinet/tcp_lro.h

/*-
 * Copyright (c) 2006, Myricom Inc.
 * Copyright (c) 2008, Intel Corporation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: head/sys/netinet/tcp_lro.h 235474 2012-05-15 13:23:44Z bz $
 */

#ifndef _TCP_LRO_H_
#define _TCP_LRO_H_

struct lro_entry;
struct lro_entry
{
	SLIST_ENTRY(lro_entry) next;
	struct mbuf	*m_head;
	struct mbuf	*m_tail;
	int		timestamp;
	struct ip	*ip;
	uint32_t	tsval;
	uint32_t	tsecr;
	uint32_t	source_ip;
	uint32_t	dest_ip;
	uint32_t	next_seq;
	uint32_t	ack_seq;
	uint32_t	len;
	uint32_t	data_csum;
	uint16_t	window;
	uint16_t	source_port;
	uint16_t	dest_port;
	uint16_t	append_cnt;
	uint16_t	mss;

};
SLIST_HEAD(lro_head, lro_entry);

struct lro_ctrl {
	struct ifnet	*ifp;
	int		lro_queued;
	int		lro_flushed;
	int		lro_bad_csum;
	int		lro_cnt;

	struct lro_head	lro_active;
	struct lro_head	lro_free;
};


int tcp_lro_init(struct lro_ctrl *);
void tcp_lro_free(struct lro_ctrl *);
void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);

/* Number of LRO entries - these are per rx queue */
#define LRO_ENTRIES			8

#endif /* _TCP_LRO_H_ */