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_ */ |
82 | |