ipv4: Remove inet_lro library
There are no longer any in-tree drivers that use it. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
David S. Miller
Родитель
63e5f9535f
Коммит
7bbf3cae65
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@ -1,142 +0,0 @@
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/*
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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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@ -406,14 +406,6 @@ config INET_XFRM_MODE_BEET
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If unsure, say Y.
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config INET_LRO
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tristate "Large Receive Offload (ipv4/tcp)"
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default y
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---help---
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Support for Large Receive Offload (ipv4/tcp).
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If unsure, say Y.
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config INET_DIAG
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tristate "INET: socket monitoring interface"
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default y
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@ -32,7 +32,6 @@ obj-$(CONFIG_INET_ESP) += esp4.o
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obj-$(CONFIG_INET_IPCOMP) += ipcomp.o
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obj-$(CONFIG_INET_XFRM_TUNNEL) += xfrm4_tunnel.o
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obj-$(CONFIG_INET_XFRM_MODE_BEET) += xfrm4_mode_beet.o
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obj-$(CONFIG_INET_LRO) += inet_lro.o
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obj-$(CONFIG_INET_TUNNEL) += tunnel4.o
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obj-$(CONFIG_INET_XFRM_MODE_TRANSPORT) += xfrm4_mode_transport.o
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obj-$(CONFIG_INET_XFRM_MODE_TUNNEL) += xfrm4_mode_tunnel.o
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@ -1,374 +0,0 @@
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/*
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* linux/net/ipv4/inet_lro.c
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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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#include <linux/module.h>
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#include <linux/if_vlan.h>
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#include <linux/inet_lro.h>
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#include <net/checksum.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jan-Bernd Themann <themann@de.ibm.com>");
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MODULE_DESCRIPTION("Large Receive Offload (ipv4 / tcp)");
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#define TCP_HDR_LEN(tcph) (tcph->doff << 2)
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#define IP_HDR_LEN(iph) (iph->ihl << 2)
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#define TCP_PAYLOAD_LENGTH(iph, tcph) \
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(ntohs(iph->tot_len) - IP_HDR_LEN(iph) - TCP_HDR_LEN(tcph))
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#define IPH_LEN_WO_OPTIONS 5
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#define TCPH_LEN_WO_OPTIONS 5
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#define TCPH_LEN_W_TIMESTAMP 8
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#define LRO_MAX_PG_HLEN 64
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#define LRO_INC_STATS(lro_mgr, attr) { lro_mgr->stats.attr++; }
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/*
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* Basic tcp checks whether packet is suitable for LRO
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*/
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static int lro_tcp_ip_check(const struct iphdr *iph, const struct tcphdr *tcph,
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int len, const struct net_lro_desc *lro_desc)
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{
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/* check ip header: don't aggregate padded frames */
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if (ntohs(iph->tot_len) != len)
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return -1;
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if (TCP_PAYLOAD_LENGTH(iph, tcph) == 0)
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return -1;
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if (iph->ihl != IPH_LEN_WO_OPTIONS)
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return -1;
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if (tcph->cwr || tcph->ece || tcph->urg || !tcph->ack ||
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tcph->rst || tcph->syn || tcph->fin)
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return -1;
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if (INET_ECN_is_ce(ipv4_get_dsfield(iph)))
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return -1;
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if (tcph->doff != TCPH_LEN_WO_OPTIONS &&
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tcph->doff != TCPH_LEN_W_TIMESTAMP)
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return -1;
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/* check tcp options (only timestamp allowed) */
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if (tcph->doff == TCPH_LEN_W_TIMESTAMP) {
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__be32 *topt = (__be32 *)(tcph + 1);
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if (*topt != htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
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| (TCPOPT_TIMESTAMP << 8)
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| TCPOLEN_TIMESTAMP))
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return -1;
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/* timestamp should be in right order */
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topt++;
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if (lro_desc && after(ntohl(lro_desc->tcp_rcv_tsval),
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ntohl(*topt)))
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return -1;
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/* timestamp reply should not be zero */
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topt++;
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if (*topt == 0)
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return -1;
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}
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return 0;
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}
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static void lro_update_tcp_ip_header(struct net_lro_desc *lro_desc)
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{
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struct iphdr *iph = lro_desc->iph;
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struct tcphdr *tcph = lro_desc->tcph;
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__be32 *p;
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__wsum tcp_hdr_csum;
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tcph->ack_seq = lro_desc->tcp_ack;
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tcph->window = lro_desc->tcp_window;
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if (lro_desc->tcp_saw_tstamp) {
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p = (__be32 *)(tcph + 1);
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*(p+2) = lro_desc->tcp_rcv_tsecr;
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}
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csum_replace2(&iph->check, iph->tot_len, htons(lro_desc->ip_tot_len));
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iph->tot_len = htons(lro_desc->ip_tot_len);
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tcph->check = 0;
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tcp_hdr_csum = csum_partial(tcph, TCP_HDR_LEN(tcph), 0);
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lro_desc->data_csum = csum_add(lro_desc->data_csum, tcp_hdr_csum);
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tcph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
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lro_desc->ip_tot_len -
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IP_HDR_LEN(iph), IPPROTO_TCP,
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lro_desc->data_csum);
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}
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static __wsum lro_tcp_data_csum(struct iphdr *iph, struct tcphdr *tcph, int len)
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{
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__wsum tcp_csum;
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__wsum tcp_hdr_csum;
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__wsum tcp_ps_hdr_csum;
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tcp_csum = ~csum_unfold(tcph->check);
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tcp_hdr_csum = csum_partial(tcph, TCP_HDR_LEN(tcph), tcp_csum);
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tcp_ps_hdr_csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
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len + TCP_HDR_LEN(tcph),
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IPPROTO_TCP, 0);
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return csum_sub(csum_sub(tcp_csum, tcp_hdr_csum),
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tcp_ps_hdr_csum);
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}
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|
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static void lro_init_desc(struct net_lro_desc *lro_desc, struct sk_buff *skb,
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struct iphdr *iph, struct tcphdr *tcph)
|
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{
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int nr_frags;
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__be32 *ptr;
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u32 tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
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nr_frags = skb_shinfo(skb)->nr_frags;
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lro_desc->parent = skb;
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lro_desc->next_frag = &(skb_shinfo(skb)->frags[nr_frags]);
|
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lro_desc->iph = iph;
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lro_desc->tcph = tcph;
|
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lro_desc->tcp_next_seq = ntohl(tcph->seq) + tcp_data_len;
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lro_desc->tcp_ack = tcph->ack_seq;
|
||||
lro_desc->tcp_window = tcph->window;
|
||||
|
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lro_desc->pkt_aggr_cnt = 1;
|
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lro_desc->ip_tot_len = ntohs(iph->tot_len);
|
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|
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if (tcph->doff == 8) {
|
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ptr = (__be32 *)(tcph+1);
|
||||
lro_desc->tcp_saw_tstamp = 1;
|
||||
lro_desc->tcp_rcv_tsval = *(ptr+1);
|
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lro_desc->tcp_rcv_tsecr = *(ptr+2);
|
||||
}
|
||||
|
||||
lro_desc->mss = tcp_data_len;
|
||||
lro_desc->active = 1;
|
||||
|
||||
lro_desc->data_csum = lro_tcp_data_csum(iph, tcph,
|
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tcp_data_len);
|
||||
}
|
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|
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static inline void lro_clear_desc(struct net_lro_desc *lro_desc)
|
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{
|
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memset(lro_desc, 0, sizeof(struct net_lro_desc));
|
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}
|
||||
|
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static void lro_add_common(struct net_lro_desc *lro_desc, struct iphdr *iph,
|
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struct tcphdr *tcph, int tcp_data_len)
|
||||
{
|
||||
struct sk_buff *parent = lro_desc->parent;
|
||||
__be32 *topt;
|
||||
|
||||
lro_desc->pkt_aggr_cnt++;
|
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lro_desc->ip_tot_len += tcp_data_len;
|
||||
lro_desc->tcp_next_seq += tcp_data_len;
|
||||
lro_desc->tcp_window = tcph->window;
|
||||
lro_desc->tcp_ack = tcph->ack_seq;
|
||||
|
||||
/* don't update tcp_rcv_tsval, would not work with PAWS */
|
||||
if (lro_desc->tcp_saw_tstamp) {
|
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topt = (__be32 *) (tcph + 1);
|
||||
lro_desc->tcp_rcv_tsecr = *(topt + 2);
|
||||
}
|
||||
|
||||
lro_desc->data_csum = csum_block_add(lro_desc->data_csum,
|
||||
lro_tcp_data_csum(iph, tcph,
|
||||
tcp_data_len),
|
||||
parent->len);
|
||||
|
||||
parent->len += tcp_data_len;
|
||||
parent->data_len += tcp_data_len;
|
||||
if (tcp_data_len > lro_desc->mss)
|
||||
lro_desc->mss = tcp_data_len;
|
||||
}
|
||||
|
||||
static void lro_add_packet(struct net_lro_desc *lro_desc, struct sk_buff *skb,
|
||||
struct iphdr *iph, struct tcphdr *tcph)
|
||||
{
|
||||
struct sk_buff *parent = lro_desc->parent;
|
||||
int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
|
||||
|
||||
lro_add_common(lro_desc, iph, tcph, tcp_data_len);
|
||||
|
||||
skb_pull(skb, (skb->len - tcp_data_len));
|
||||
parent->truesize += skb->truesize;
|
||||
|
||||
if (lro_desc->last_skb)
|
||||
lro_desc->last_skb->next = skb;
|
||||
else
|
||||
skb_shinfo(parent)->frag_list = skb;
|
||||
|
||||
lro_desc->last_skb = skb;
|
||||
}
|
||||
|
||||
|
||||
static int lro_check_tcp_conn(struct net_lro_desc *lro_desc,
|
||||
struct iphdr *iph,
|
||||
struct tcphdr *tcph)
|
||||
{
|
||||
if ((lro_desc->iph->saddr != iph->saddr) ||
|
||||
(lro_desc->iph->daddr != iph->daddr) ||
|
||||
(lro_desc->tcph->source != tcph->source) ||
|
||||
(lro_desc->tcph->dest != tcph->dest))
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct net_lro_desc *lro_get_desc(struct net_lro_mgr *lro_mgr,
|
||||
struct net_lro_desc *lro_arr,
|
||||
struct iphdr *iph,
|
||||
struct tcphdr *tcph)
|
||||
{
|
||||
struct net_lro_desc *lro_desc = NULL;
|
||||
struct net_lro_desc *tmp;
|
||||
int max_desc = lro_mgr->max_desc;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < max_desc; i++) {
|
||||
tmp = &lro_arr[i];
|
||||
if (tmp->active)
|
||||
if (!lro_check_tcp_conn(tmp, iph, tcph)) {
|
||||
lro_desc = tmp;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < max_desc; i++) {
|
||||
if (!lro_arr[i].active) {
|
||||
lro_desc = &lro_arr[i];
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
LRO_INC_STATS(lro_mgr, no_desc);
|
||||
out:
|
||||
return lro_desc;
|
||||
}
|
||||
|
||||
static void lro_flush(struct net_lro_mgr *lro_mgr,
|
||||
struct net_lro_desc *lro_desc)
|
||||
{
|
||||
if (lro_desc->pkt_aggr_cnt > 1)
|
||||
lro_update_tcp_ip_header(lro_desc);
|
||||
|
||||
skb_shinfo(lro_desc->parent)->gso_size = lro_desc->mss;
|
||||
|
||||
if (lro_mgr->features & LRO_F_NAPI)
|
||||
netif_receive_skb(lro_desc->parent);
|
||||
else
|
||||
netif_rx(lro_desc->parent);
|
||||
|
||||
LRO_INC_STATS(lro_mgr, flushed);
|
||||
lro_clear_desc(lro_desc);
|
||||
}
|
||||
|
||||
static int __lro_proc_skb(struct net_lro_mgr *lro_mgr, struct sk_buff *skb,
|
||||
void *priv)
|
||||
{
|
||||
struct net_lro_desc *lro_desc;
|
||||
struct iphdr *iph;
|
||||
struct tcphdr *tcph;
|
||||
u64 flags;
|
||||
int vlan_hdr_len = 0;
|
||||
|
||||
if (!lro_mgr->get_skb_header ||
|
||||
lro_mgr->get_skb_header(skb, (void *)&iph, (void *)&tcph,
|
||||
&flags, priv))
|
||||
goto out;
|
||||
|
||||
if (!(flags & LRO_IPV4) || !(flags & LRO_TCP))
|
||||
goto out;
|
||||
|
||||
lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph);
|
||||
if (!lro_desc)
|
||||
goto out;
|
||||
|
||||
if ((skb->protocol == htons(ETH_P_8021Q)) &&
|
||||
!(lro_mgr->features & LRO_F_EXTRACT_VLAN_ID))
|
||||
vlan_hdr_len = VLAN_HLEN;
|
||||
|
||||
if (!lro_desc->active) { /* start new lro session */
|
||||
if (lro_tcp_ip_check(iph, tcph, skb->len - vlan_hdr_len, NULL))
|
||||
goto out;
|
||||
|
||||
skb->ip_summed = lro_mgr->ip_summed_aggr;
|
||||
lro_init_desc(lro_desc, skb, iph, tcph);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (lro_desc->tcp_next_seq != ntohl(tcph->seq))
|
||||
goto out2;
|
||||
|
||||
if (lro_tcp_ip_check(iph, tcph, skb->len, lro_desc))
|
||||
goto out2;
|
||||
|
||||
lro_add_packet(lro_desc, skb, iph, tcph);
|
||||
LRO_INC_STATS(lro_mgr, aggregated);
|
||||
|
||||
if ((lro_desc->pkt_aggr_cnt >= lro_mgr->max_aggr) ||
|
||||
lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu))
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
return 0;
|
||||
|
||||
out2: /* send aggregated SKBs to stack */
|
||||
lro_flush(lro_mgr, lro_desc);
|
||||
|
||||
out:
|
||||
return 1;
|
||||
}
|
||||
|
||||
void lro_receive_skb(struct net_lro_mgr *lro_mgr,
|
||||
struct sk_buff *skb,
|
||||
void *priv)
|
||||
{
|
||||
if (__lro_proc_skb(lro_mgr, skb, priv)) {
|
||||
if (lro_mgr->features & LRO_F_NAPI)
|
||||
netif_receive_skb(skb);
|
||||
else
|
||||
netif_rx(skb);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(lro_receive_skb);
|
||||
|
||||
void lro_flush_all(struct net_lro_mgr *lro_mgr)
|
||||
{
|
||||
int i;
|
||||
struct net_lro_desc *lro_desc = lro_mgr->lro_arr;
|
||||
|
||||
for (i = 0; i < lro_mgr->max_desc; i++) {
|
||||
if (lro_desc[i].active)
|
||||
lro_flush(lro_mgr, &lro_desc[i]);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(lro_flush_all);
|
||||
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