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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 int frag_align_pad; /* Padding required to properly align layer 3
95 * headers in generated skb when using frags */
96
97 struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
98
99 /*
100 * Optimized driver functions
101 *
102 * get_skb_header: returns tcp and ip header for packet in SKB
103 */
104 int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr,
105 void **tcpudp_hdr, u64 *hdr_flags, void *priv);
106
107 /* hdr_flags: */
108#define LRO_IPV4 1 /* ip_hdr is IPv4 header */
109#define LRO_TCP 2 /* tcpudp_hdr is TCP header */
110
111 /*
112 * get_frag_header: returns mac, tcp and ip header for packet in SKB
113 *
114 * @hdr_flags: Indicate what kind of LRO has to be done
115 * (IPv4/IPv6/TCP/UDP)
116 */
117 int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr,
118 void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags,
119 void *priv);
120};
121
122/*
123 * Processes a SKB
124 *
125 * @lro_mgr: LRO manager to use
126 * @skb: SKB to aggregate
127 * @priv: Private data that may be used by driver functions
128 * (for example get_tcp_ip_hdr)
129 */
130
131void lro_receive_skb(struct net_lro_mgr *lro_mgr,
132 struct sk_buff *skb,
133 void *priv);
134
135/*
136 * Processes a SKB with VLAN HW acceleration support
137 */
138
139void lro_vlan_hwaccel_receive_skb(struct net_lro_mgr *lro_mgr,
140 struct sk_buff *skb,
141 struct vlan_group *vgrp,
142 u16 vlan_tag,
143 void *priv);
144
145/*
146 * Processes a fragment list
147 *
148 * This functions aggregate fragments and generate SKBs do pass
149 * the packets to the stack.
150 *
151 * @lro_mgr: LRO manager to use
152 * @frags: Fragment to be processed. Must contain entire header in first
153 * element.
154 * @len: Length of received data
155 * @true_size: Actual size of memory the fragment is consuming
156 * @priv: Private data that may be used by driver functions
157 * (for example get_tcp_ip_hdr)
158 */
159
160void lro_receive_frags(struct net_lro_mgr *lro_mgr,
161 struct skb_frag_struct *frags,
162 int len, int true_size, void *priv, __wsum sum);
163
164void lro_vlan_hwaccel_receive_frags(struct net_lro_mgr *lro_mgr,
165 struct skb_frag_struct *frags,
166 int len, int true_size,
167 struct vlan_group *vgrp,
168 u16 vlan_tag,
169 void *priv, __wsum sum);
170
171/*
172 * Forward all aggregated SKBs held by lro_mgr to network stack
173 */
174
175void lro_flush_all(struct net_lro_mgr *lro_mgr);
176
177void lro_flush_pkt(struct net_lro_mgr *lro_mgr,
178 struct iphdr *iph, struct tcphdr *tcph);
179
180#endif