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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2006, Myricom Inc.
* Copyright (c) 2008, Intel Corporation.
* Copyright (c) 2016 Mellanox Technologies.
* 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.
*
* $FreeBSD$
*/
#ifndef _TCP_LRO_H_
#define _TCP_LRO_H_
#include <sys/time.h>
#ifndef TCP_LRO_ENTRIES
/* Define default number of LRO entries per RX queue */
#define TCP_LRO_ENTRIES 8
#endif
/*
* Flags for ACK entry for compression
* the bottom 8 bits has the th_flags.
* LRO itself adds only the TSTMP flags
* to indicate if either of the types
* of timestamps are filled and the
* HAS_TSTMP option to indicate if the
* TCP timestamp option is valid.
*
* The other 5 flag bits are for processing
* by a stack.
*
*/
#define TSTMP_LRO 0x0100
#define TSTMP_HDWR 0x0200
#define HAS_TSTMP 0x0400
/* Flags in LRO entry */
#define CAN_USE_ACKCMP 0x0001
#define HAS_COMP_ENTRIES 0x0002
struct inpcb;
struct lro_entry {
LIST_ENTRY(lro_entry) next;
LIST_ENTRY(lro_entry) hash_next;
struct mbuf *m_head;
struct mbuf *m_tail;
struct mbuf *m_last_mbuf;
struct mbuf *m_prev_last;
struct inpcb *inp;
union {
struct ip *ip4;
struct ip6_hdr *ip6;
} leip;
union {
in_addr_t s_ip4;
struct in6_addr s_ip6;
} lesource;
union {
in_addr_t d_ip4;
struct in6_addr d_ip6;
} ledest;
uint16_t source_port;
uint16_t dest_port;
uint16_t eh_type; /* EthernetHeader type. */
uint16_t append_cnt;
uint32_t p_len; /* IP header payload length. */
uint32_t ulp_csum; /* TCP, etc. checksum. */
uint32_t next_seq; /* tcp_seq */
uint32_t ack_seq; /* tcp_seq */
uint32_t tsval;
uint32_t tsecr;
uint32_t tcp_tot_p_len; /* TCP payload length of chain */
uint16_t window;
uint16_t timestamp; /* flag, not a TCP hdr field. */
uint16_t need_wakeup;
uint16_t mbuf_cnt; /* Count of mbufs collected see note */
uint16_t mbuf_appended;
uint16_t cmp_ack_cnt;
uint16_t flags;
uint16_t strip_cnt;
struct timeval mtime;
};
/*
* Note: The mbuf_cnt field tracks our number of mbufs added to the m_next
* list. Each mbuf counted can have data and of course it will
* have an ack as well (by defintion any inbound tcp segment will
* have an ack value. We use this count to tell us how many ACK's
* are present for our ack-count threshold. If we exceed that or
* the data threshold we will wake up the endpoint.
*/
LIST_HEAD(lro_head, lro_entry);
#define le_ip4 leip.ip4
#define le_ip6 leip.ip6
#define source_ip4 lesource.s_ip4
#define dest_ip4 ledest.d_ip4
#define source_ip6 lesource.s_ip6
#define dest_ip6 ledest.d_ip6
struct lro_mbuf_sort {
uint64_t seq;
struct mbuf *mb;
};
/* NB: This is part of driver structs. */
struct lro_ctrl {
struct ifnet *ifp;
struct lro_mbuf_sort *lro_mbuf_data;
struct timeval lro_last_flush;
uint64_t lro_queued;
uint64_t lro_flushed;
uint64_t lro_bad_csum;
unsigned lro_cnt;
unsigned lro_mbuf_count;
unsigned lro_mbuf_max;
unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
unsigned lro_length_lim; /* max len of aggregated data */
u_long lro_hashsz;
struct lro_head *lro_hash;
struct lro_head lro_active;
struct lro_head lro_free;
};
struct tcp_ackent {
uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
uint32_t seq; /* th_seq value */
uint32_t ack; /* th_ack value */
uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
uint16_t win; /* TCP window */
uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
uint8_t codepoint; /* IP level codepoint including ECN bits */
uint8_t ack_val_set; /* Classification of ack used by the stack */
uint8_t pad[2]; /* To 32 byte boundary */
};
/* We use two M_PROTO on the mbuf */
#define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
#define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
#define TCP_LRO_LENGTH_MAX 65535
#define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
int tcp_lro_init(struct lro_ctrl *);
int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
void tcp_lro_free(struct lro_ctrl *);
void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
void tcp_lro_flush_all(struct lro_ctrl *);
int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
void tcp_lro_reg_mbufq(void);
void tcp_lro_dereg_mbufq(void);
#define TCP_LRO_NO_ENTRIES -2
#define TCP_LRO_CANNOT -1
#define TCP_LRO_NOT_SUPPORTED 1
#endif /* _TCP_LRO_H_ */
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