1/* 2 * Copyright (c) 2011 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29#ifndef TCP_LRO_H_ 30#define TCP_LRO_H_ 31 32#ifdef BSD_KERNEL_PRIVATE 33 34#define TCP_LRO_NUM_FLOWS (16) /* must be <= 255 for char lro_flow_map */ 35#define TCP_LRO_FLOW_MAP (1024) 36 37struct lro_flow { 38 struct mbuf *lr_mhead; /* coalesced mbuf chain head */ 39 struct mbuf *lr_mtail; /* coalesced mbuf chain tail */ 40 struct tcphdr *lr_tcphdr; /* ptr to TCP hdr in frame */ 41 u_int32_t *lr_tsval; /* address of tsval in frame */ 42 u_int32_t *lr_tsecr; /* tsecr field in TCP header */ 43 tcp_seq lr_seq; /* next expected seq num */ 44 unsigned int lr_len; /* length of LRO frame */ 45 struct in_addr lr_faddr; /* foreign address */ 46 struct in_addr lr_laddr; /* local address */ 47 unsigned short int lr_fport; /* foreign port */ 48 unsigned short int lr_lport; /* local port */ 49 u_int32_t lr_timestamp; /* for ejecting the flow */ 50 unsigned short int lr_hash_map; /* back pointer to hash map */ 51 unsigned short int lr_flags; /* pad */ 52} __attribute__((aligned(8))); 53 54/* lr_flags - only 16 bits available */ 55#define LRO_EJECT_REQ 0x1 56 57 58#define TCP_LRO_FLOW_UNINIT TCP_LRO_NUM_FLOWS+1 59#define TCP_LRO_FLOW_NOTFOUND TCP_LRO_FLOW_UNINIT 60 61/* Max packets to be coalesced before pushing to app */ 62#define LRO_MX_COALESCE_PKTS (8) 63 64/* 65 * Min num of bytes in a packet to trigger coalescing 66 */ 67#define LRO_MIN_COALESC_SZ (1300) 68 69/* 70 * Max amount of time to wait before flushing flows in msecs. 71 * Units are in msecs. 72 * This number has been carefully chosen and should be altered with care. 73 */ 74#define LRO_MX_TIME_TO_BUFFER 10 75 76/* similar to INP_PCBHASH */ 77#define LRO_HASH(faddr, laddr, fport, lport, mask) \ 78 (((faddr) ^ ((laddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask)) 79#endif 80 81#endif /* TCP_LRO_H_ */ 82