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-rw-r--r--include/linux/inet_lro.h177
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diff --git a/include/linux/inet_lro.h b/include/linux/inet_lro.h
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1/*
2 * linux/include/linux/inet_lro.h
3 *
4 * Large Receive Offload (ipv4 / tcp)
5 *
6 * (C) Copyright IBM Corp. 2007
7 *
8 * Authors:
9 * Jan-Bernd Themann <themann@de.ibm.com>
10 * Christoph Raisch <raisch@de.ibm.com>
11 *
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28#ifndef __INET_LRO_H_
29#define __INET_LRO_H_
30
31#include <net/ip.h>
32#include <net/tcp.h>
33
34/*
35 * LRO statistics
36 */
37
38struct net_lro_stats {
39 unsigned long aggregated;
40 unsigned long flushed;
41 unsigned long no_desc;
42};
43
44/*
45 * LRO descriptor for a tcp session
46 */
47struct net_lro_desc {
48 struct sk_buff *parent;
49 struct sk_buff *last_skb;
50 struct skb_frag_struct *next_frag;
51 struct iphdr *iph;
52 struct tcphdr *tcph;
53 struct vlan_group *vgrp;
54 __wsum data_csum;
55 __be32 tcp_rcv_tsecr;
56 __be32 tcp_rcv_tsval;
57 __be32 tcp_ack;
58 u32 tcp_next_seq;
59 u32 skb_tot_frags_len;
60 u16 ip_tot_len;
61 u16 tcp_saw_tstamp; /* timestamps enabled */
62 __be16 tcp_window;
63 u16 vlan_tag;
64 int pkt_aggr_cnt; /* counts aggregated packets */
65 int vlan_packet;
66 int mss;
67 int active;
68};
69
70/*
71 * Large Receive Offload (LRO) Manager
72 *
73 * Fields must be set by driver
74 */
75
76struct net_lro_mgr {
77 struct net_device *dev;
78 struct net_lro_stats stats;
79
80 /* LRO features */
81 unsigned long features;
82#define LRO_F_NAPI 1 /* Pass packets to stack via NAPI */
83#define LRO_F_EXTRACT_VLAN_ID 2 /* Set flag if VLAN IDs are extracted
84 from received packets and eth protocol
85 is still ETH_P_8021Q */
86
87 u32 ip_summed; /* Set in non generated SKBs in page mode */
88 u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY
89 * or CHECKSUM_NONE */
90
91 int max_desc; /* Max number of LRO descriptors */
92 int max_aggr; /* Max number of LRO packets to be aggregated */
93
94 struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
95
96 /*
97 * Optimized driver functions
98 *
99 * get_skb_header: returns tcp and ip header for packet in SKB
100 */
101 int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr,
102 void **tcpudp_hdr, u64 *hdr_flags, void *priv);
103
104 /* hdr_flags: */
105#define LRO_IPV4 1 /* ip_hdr is IPv4 header */
106#define LRO_TCP 2 /* tcpudp_hdr is TCP header */
107
108 /*
109 * get_frag_header: returns mac, tcp and ip header for packet in SKB
110 *
111 * @hdr_flags: Indicate what kind of LRO has to be done
112 * (IPv4/IPv6/TCP/UDP)
113 */
114 int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr,
115 void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags,
116 void *priv);
117};
118
119/*
120 * Processes a SKB
121 *
122 * @lro_mgr: LRO manager to use
123 * @skb: SKB to aggregate
124 * @priv: Private data that may be used by driver functions
125 * (for example get_tcp_ip_hdr)
126 */
127
128void lro_receive_skb(struct net_lro_mgr *lro_mgr,
129 struct sk_buff *skb,
130 void *priv);
131
132/*
133 * Processes a SKB with VLAN HW acceleration support
134 */
135
136void lro_vlan_hwaccel_receive_skb(struct net_lro_mgr *lro_mgr,
137 struct sk_buff *skb,
138 struct vlan_group *vgrp,
139 u16 vlan_tag,
140 void *priv);
141
142/*
143 * Processes a fragment list
144 *
145 * This functions aggregate fragments and generate SKBs do pass
146 * the packets to the stack.
147 *
148 * @lro_mgr: LRO manager to use
149 * @frags: Fragment to be processed. Must contain entire header in first
150 * element.
151 * @len: Length of received data
152 * @true_size: Actual size of memory the fragment is consuming
153 * @priv: Private data that may be used by driver functions
154 * (for example get_tcp_ip_hdr)
155 */
156
157void lro_receive_frags(struct net_lro_mgr *lro_mgr,
158 struct skb_frag_struct *frags,
159 int len, int true_size, void *priv, __wsum sum);
160
161void lro_vlan_hwaccel_receive_frags(struct net_lro_mgr *lro_mgr,
162 struct skb_frag_struct *frags,
163 int len, int true_size,
164 struct vlan_group *vgrp,
165 u16 vlan_tag,
166 void *priv, __wsum sum);
167
168/*
169 * Forward all aggregated SKBs held by lro_mgr to network stack
170 */
171
172void lro_flush_all(struct net_lro_mgr *lro_mgr);
173
174void lro_flush_pkt(struct net_lro_mgr *lro_mgr,
175 struct iphdr *iph, struct tcphdr *tcph);
176
177#endif
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