166 lines
4.3 KiB
C
166 lines
4.3 KiB
C
/*
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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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* Processes a fragment list
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*
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* This functions aggregate fragments and generate SKBs do pass
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* the packets to the stack.
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*
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* @lro_mgr: LRO manager to use
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* @frags: Fragment to be processed. Must contain entire header in first
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* element.
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* @len: Length of received data
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* @true_size: Actual size of memory the fragment is consuming
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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_frags(struct net_lro_mgr *lro_mgr,
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struct skb_frag_struct *frags,
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int len, int true_size, void *priv, __wsum sum);
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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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void lro_flush_pkt(struct net_lro_mgr *lro_mgr,
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struct iphdr *iph, struct tcphdr *tcph);
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#endif
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