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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2006, Myricom Inc.
* Copyright (c) 2008, Intel Corporation.
* Copyright (c) 2016-2021 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
/*
* Default number of interrupts on the same cpu in a row
* that will cause us to declare a "affinity cpu".
*/
#define TCP_LRO_CPU_DECLARATION_THRESH 50
struct inpcb;
union lro_address {
u_long raw[1];
struct {
uint8_t lro_type; /* internal */
#define LRO_TYPE_NONE 0
#define LRO_TYPE_IPV4_TCP 1
#define LRO_TYPE_IPV6_TCP 2
#define LRO_TYPE_IPV4_UDP 3
#define LRO_TYPE_IPV6_UDP 4
uint8_t lro_flags;
#define LRO_FLAG_DECRYPTED 1
uint16_t vlan_id; /* VLAN identifier */
uint16_t s_port; /* source TCP/UDP port */
uint16_t d_port; /* destination TCP/UDP port */
uint32_t vxlan_vni; /* VXLAN virtual network identifier */
union {
#ifdef INET
struct in_addr v4;
#endif
#ifdef INET6
struct in6_addr v6;
#endif
} s_addr; /* source IPv4/IPv6 address */
union {
#ifdef INET
struct in_addr v4;
#endif
#ifdef INET6
struct in6_addr v6;
#endif
} d_addr; /* destination IPv4/IPv6 address */
};
} __aligned(sizeof(u_long));
#define LRO_RAW_ADDRESS_MAX \
(sizeof(union lro_address) / sizeof(u_long))
/* Optimize address comparison by comparing one unsigned long at a time: */
static inline bool
lro_address_compare(const union lro_address *pa, const union lro_address *pb)
{
if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) {
return (true);
} else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) {
if (pa->raw[i] != pb->raw[i])
return (false);
}
return (true);
}
struct lro_parser {
union lro_address data;
union {
uint8_t *l3;
struct ip *ip4;
struct ip6_hdr *ip6;
};
union {
uint8_t *l4;
struct tcphdr *tcp;
struct udphdr *udp;
};
uint16_t total_hdr_len;
};
/* This structure is zeroed frequently, try to keep it small. */
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 lro_parser outer;
struct lro_parser inner;
uint32_t next_seq; /* tcp_seq */
uint32_t ack_seq; /* tcp_seq */
uint32_t tsval;
uint32_t tsecr;
uint16_t compressed;
uint16_t uncompressed;
uint16_t window;
uint16_t timestamp; /* flag, not a TCP hdr field. */
struct bintime alloc_time; /* time when entry was allocated */
};
LIST_HEAD(lro_head, lro_entry);
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 bintime lro_last_queue_time; /* last time data was queued */
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 short lro_cpu; /* Guess at the cpu we have affinity too */
unsigned lro_length_lim; /* max len of aggregated data */
u_long lro_hashsz;
uint32_t lro_last_cpu;
uint32_t lro_cnt_of_same_cpu;
struct lro_head *lro_hash;
struct lro_head lro_active;
struct lro_head lro_free;
uint8_t lro_cpu_is_set; /* Flag to say its ok to set the CPU on the inp */
};
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 - 255) /* safe value with room for outer headers */
#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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