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71c87e0c JBT |
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 | ||
38 | struct 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 | */ | |
47 | struct 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; | |
71c87e0c | 53 | __wsum data_csum; |
9df7c98a AV |
54 | __be32 tcp_rcv_tsecr; |
55 | __be32 tcp_rcv_tsval; | |
f53f4137 | 56 | __be32 tcp_ack; |
71c87e0c JBT |
57 | u32 tcp_next_seq; |
58 | u32 skb_tot_frags_len; | |
59 | u16 ip_tot_len; | |
60 | u16 tcp_saw_tstamp; /* timestamps enabled */ | |
9df7c98a | 61 | __be16 tcp_window; |
71c87e0c JBT |
62 | int pkt_aggr_cnt; /* counts aggregated packets */ |
63 | int vlan_packet; | |
64 | int mss; | |
65 | int active; | |
66 | }; | |
67 | ||
68 | /* | |
69 | * Large Receive Offload (LRO) Manager | |
70 | * | |
71 | * Fields must be set by driver | |
72 | */ | |
73 | ||
74 | struct net_lro_mgr { | |
75 | struct net_device *dev; | |
76 | struct net_lro_stats stats; | |
77 | ||
78 | /* LRO features */ | |
79 | unsigned long features; | |
80 | #define LRO_F_NAPI 1 /* Pass packets to stack via NAPI */ | |
81 | #define LRO_F_EXTRACT_VLAN_ID 2 /* Set flag if VLAN IDs are extracted | |
82 | from received packets and eth protocol | |
83 | is still ETH_P_8021Q */ | |
84 | ||
251a4b32 EC |
85 | /* |
86 | * Set for generated SKBs that are not added to | |
87 | * the frag list in fragmented mode | |
88 | */ | |
89 | u32 ip_summed; | |
71c87e0c JBT |
90 | u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY |
91 | * or CHECKSUM_NONE */ | |
92 | ||
93 | int max_desc; /* Max number of LRO descriptors */ | |
94 | int max_aggr; /* Max number of LRO packets to be aggregated */ | |
95 | ||
621544eb AG |
96 | int frag_align_pad; /* Padding required to properly align layer 3 |
97 | * headers in generated skb when using frags */ | |
98 | ||
71c87e0c JBT |
99 | struct net_lro_desc *lro_arr; /* Array of LRO descriptors */ |
100 | ||
101 | /* | |
102 | * Optimized driver functions | |
103 | * | |
104 | * get_skb_header: returns tcp and ip header for packet in SKB | |
105 | */ | |
106 | int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr, | |
107 | void **tcpudp_hdr, u64 *hdr_flags, void *priv); | |
108 | ||
109 | /* hdr_flags: */ | |
110 | #define LRO_IPV4 1 /* ip_hdr is IPv4 header */ | |
111 | #define LRO_TCP 2 /* tcpudp_hdr is TCP header */ | |
112 | ||
113 | /* | |
114 | * get_frag_header: returns mac, tcp and ip header for packet in SKB | |
115 | * | |
116 | * @hdr_flags: Indicate what kind of LRO has to be done | |
117 | * (IPv4/IPv6/TCP/UDP) | |
118 | */ | |
119 | int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr, | |
120 | void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags, | |
121 | void *priv); | |
122 | }; | |
123 | ||
124 | /* | |
125 | * Processes a SKB | |
126 | * | |
127 | * @lro_mgr: LRO manager to use | |
128 | * @skb: SKB to aggregate | |
129 | * @priv: Private data that may be used by driver functions | |
130 | * (for example get_tcp_ip_hdr) | |
131 | */ | |
132 | ||
133 | void lro_receive_skb(struct net_lro_mgr *lro_mgr, | |
134 | struct sk_buff *skb, | |
135 | void *priv); | |
136 | ||
71c87e0c JBT |
137 | /* |
138 | * Processes a fragment list | |
139 | * | |
140 | * This functions aggregate fragments and generate SKBs do pass | |
141 | * the packets to the stack. | |
142 | * | |
143 | * @lro_mgr: LRO manager to use | |
144 | * @frags: Fragment to be processed. Must contain entire header in first | |
145 | * element. | |
146 | * @len: Length of received data | |
147 | * @true_size: Actual size of memory the fragment is consuming | |
148 | * @priv: Private data that may be used by driver functions | |
149 | * (for example get_tcp_ip_hdr) | |
150 | */ | |
151 | ||
152 | void lro_receive_frags(struct net_lro_mgr *lro_mgr, | |
153 | struct skb_frag_struct *frags, | |
154 | int len, int true_size, void *priv, __wsum sum); | |
155 | ||
71c87e0c JBT |
156 | /* |
157 | * Forward all aggregated SKBs held by lro_mgr to network stack | |
158 | */ | |
159 | ||
160 | void lro_flush_all(struct net_lro_mgr *lro_mgr); | |
161 | ||
162 | void lro_flush_pkt(struct net_lro_mgr *lro_mgr, | |
163 | struct iphdr *iph, struct tcphdr *tcph); | |
164 | ||
165 | #endif |