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142 lines
3.6 KiB
142 lines
3.6 KiB
/* |
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* linux/include/linux/inet_lro.h |
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* |
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* Large Receive Offload (ipv4 / tcp) |
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* |
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* (C) Copyright IBM Corp. 2007 |
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* |
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* Authors: |
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* Jan-Bernd Themann <themann@de.ibm.com> |
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* Christoph Raisch <raisch@de.ibm.com> |
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* |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#ifndef __INET_LRO_H_ |
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#define __INET_LRO_H_ |
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#include <net/ip.h> |
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#include <net/tcp.h> |
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/* |
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* LRO statistics |
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*/ |
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struct net_lro_stats { |
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unsigned long aggregated; |
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unsigned long flushed; |
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unsigned long no_desc; |
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}; |
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/* |
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* LRO descriptor for a tcp session |
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*/ |
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struct net_lro_desc { |
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struct sk_buff *parent; |
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struct sk_buff *last_skb; |
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struct skb_frag_struct *next_frag; |
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struct iphdr *iph; |
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struct tcphdr *tcph; |
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__wsum data_csum; |
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__be32 tcp_rcv_tsecr; |
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__be32 tcp_rcv_tsval; |
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__be32 tcp_ack; |
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u32 tcp_next_seq; |
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u32 skb_tot_frags_len; |
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u16 ip_tot_len; |
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u16 tcp_saw_tstamp; /* timestamps enabled */ |
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__be16 tcp_window; |
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int pkt_aggr_cnt; /* counts aggregated packets */ |
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int vlan_packet; |
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int mss; |
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int active; |
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}; |
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/* |
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* Large Receive Offload (LRO) Manager |
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* |
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* Fields must be set by driver |
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*/ |
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struct net_lro_mgr { |
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struct net_device *dev; |
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struct net_lro_stats stats; |
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/* LRO features */ |
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unsigned long features; |
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#define LRO_F_NAPI 1 /* Pass packets to stack via NAPI */ |
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#define LRO_F_EXTRACT_VLAN_ID 2 /* Set flag if VLAN IDs are extracted |
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from received packets and eth protocol |
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is still ETH_P_8021Q */ |
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/* |
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* Set for generated SKBs that are not added to |
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* the frag list in fragmented mode |
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*/ |
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u32 ip_summed; |
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u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY |
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* or CHECKSUM_NONE */ |
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int max_desc; /* Max number of LRO descriptors */ |
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int max_aggr; /* Max number of LRO packets to be aggregated */ |
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int frag_align_pad; /* Padding required to properly align layer 3 |
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* headers in generated skb when using frags */ |
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struct net_lro_desc *lro_arr; /* Array of LRO descriptors */ |
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/* |
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* Optimized driver functions |
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* |
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* get_skb_header: returns tcp and ip header for packet in SKB |
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*/ |
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int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr, |
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void **tcpudp_hdr, u64 *hdr_flags, void *priv); |
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/* hdr_flags: */ |
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#define LRO_IPV4 1 /* ip_hdr is IPv4 header */ |
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#define LRO_TCP 2 /* tcpudp_hdr is TCP header */ |
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/* |
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* get_frag_header: returns mac, tcp and ip header for packet in SKB |
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* |
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* @hdr_flags: Indicate what kind of LRO has to be done |
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* (IPv4/IPv6/TCP/UDP) |
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*/ |
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int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr, |
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void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags, |
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void *priv); |
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}; |
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/* |
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* Processes a SKB |
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* |
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* @lro_mgr: LRO manager to use |
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* @skb: SKB to aggregate |
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* @priv: Private data that may be used by driver functions |
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* (for example get_tcp_ip_hdr) |
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*/ |
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void lro_receive_skb(struct net_lro_mgr *lro_mgr, |
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struct sk_buff *skb, |
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void *priv); |
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/* |
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* Forward all aggregated SKBs held by lro_mgr to network stack |
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*/ |
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void lro_flush_all(struct net_lro_mgr *lro_mgr); |
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#endif
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