2 * linux/include/linux/inet_lro.h
4 * Large Receive Offload (ipv4 / tcp)
6 * (C) Copyright IBM Corp. 2007
9 * Jan-Bernd Themann <themann@de.ibm.com>
10 * Christoph Raisch <raisch@de.ibm.com>
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)
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.
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.
38 struct net_lro_stats
{
39 unsigned long aggregated
;
40 unsigned long flushed
;
41 unsigned long no_desc
;
45 * LRO descriptor for a tcp session
48 struct sk_buff
*parent
;
49 struct sk_buff
*last_skb
;
50 struct skb_frag_struct
*next_frag
;
58 u32 skb_tot_frags_len
;
60 u16 tcp_saw_tstamp
; /* timestamps enabled */
62 int pkt_aggr_cnt
; /* counts aggregated packets */
69 * Large Receive Offload (LRO) Manager
71 * Fields must be set by driver
75 struct net_device
*dev
;
76 struct net_lro_stats stats
;
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 */
86 * Set for generated SKBs that are not added to
87 * the frag list in fragmented mode
90 u32 ip_summed_aggr
; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY
93 int max_desc
; /* Max number of LRO descriptors */
94 int max_aggr
; /* Max number of LRO packets to be aggregated */
96 int frag_align_pad
; /* Padding required to properly align layer 3
97 * headers in generated skb when using frags */
99 struct net_lro_desc
*lro_arr
; /* Array of LRO descriptors */
102 * Optimized driver functions
104 * get_skb_header: returns tcp and ip header for packet in SKB
106 int (*get_skb_header
)(struct sk_buff
*skb
, void **ip_hdr
,
107 void **tcpudp_hdr
, u64
*hdr_flags
, void *priv
);
110 #define LRO_IPV4 1 /* ip_hdr is IPv4 header */
111 #define LRO_TCP 2 /* tcpudp_hdr is TCP header */
114 * get_frag_header: returns mac, tcp and ip header for packet in SKB
116 * @hdr_flags: Indicate what kind of LRO has to be done
117 * (IPv4/IPv6/TCP/UDP)
119 int (*get_frag_header
)(struct skb_frag_struct
*frag
, void **mac_hdr
,
120 void **ip_hdr
, void **tcpudp_hdr
, u64
*hdr_flags
,
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)
133 void lro_receive_skb(struct net_lro_mgr
*lro_mgr
,
138 * Processes a fragment list
140 * This functions aggregate fragments and generate SKBs do pass
141 * the packets to the stack.
143 * @lro_mgr: LRO manager to use
144 * @frags: Fragment to be processed. Must contain entire header in first
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)
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
);
157 * Forward all aggregated SKBs held by lro_mgr to network stack
160 void lro_flush_all(struct net_lro_mgr
*lro_mgr
);
162 void lro_flush_pkt(struct net_lro_mgr
*lro_mgr
,
163 struct iphdr
*iph
, struct tcphdr
*tcph
);
This page took 0.037041 seconds and 5 git commands to generate.