projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 316670eb A |
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 | ||
| 37 | struct 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_ */ |