Commit 7bbf3cae authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller

ipv4: Remove inet_lro library

There are no longer any in-tree drivers that use it.
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 63e5f953
/*
* linux/include/linux/inet_lro.h
*
* Large Receive Offload (ipv4 / tcp)
*
* (C) Copyright IBM Corp. 2007
*
* Authors:
* Jan-Bernd Themann <themann@de.ibm.com>
* Christoph Raisch <raisch@de.ibm.com>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __INET_LRO_H_
#define __INET_LRO_H_
#include <net/ip.h>
#include <net/tcp.h>
/*
* LRO statistics
*/
struct net_lro_stats {
unsigned long aggregated;
unsigned long flushed;
unsigned long no_desc;
};
/*
* LRO descriptor for a tcp session
*/
struct net_lro_desc {
struct sk_buff *parent;
struct sk_buff *last_skb;
struct skb_frag_struct *next_frag;
struct iphdr *iph;
struct tcphdr *tcph;
__wsum data_csum;
__be32 tcp_rcv_tsecr;
__be32 tcp_rcv_tsval;
__be32 tcp_ack;
u32 tcp_next_seq;
u32 skb_tot_frags_len;
u16 ip_tot_len;
u16 tcp_saw_tstamp; /* timestamps enabled */
__be16 tcp_window;
int pkt_aggr_cnt; /* counts aggregated packets */
int vlan_packet;
int mss;
int active;
};
/*
* Large Receive Offload (LRO) Manager
*
* Fields must be set by driver
*/
struct net_lro_mgr {
struct net_device *dev;
struct net_lro_stats stats;
/* LRO features */
unsigned long features;
#define LRO_F_NAPI 1 /* Pass packets to stack via NAPI */
#define LRO_F_EXTRACT_VLAN_ID 2 /* Set flag if VLAN IDs are extracted
from received packets and eth protocol
is still ETH_P_8021Q */
/*
* Set for generated SKBs that are not added to
* the frag list in fragmented mode
*/
u32 ip_summed;
u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY
* or CHECKSUM_NONE */
int max_desc; /* Max number of LRO descriptors */
int max_aggr; /* Max number of LRO packets to be aggregated */
int frag_align_pad; /* Padding required to properly align layer 3
* headers in generated skb when using frags */
struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
/*
* Optimized driver functions
*
* get_skb_header: returns tcp and ip header for packet in SKB
*/
int (*get_skb_header)(struct sk_buff *skb, void **ip_hdr,
void **tcpudp_hdr, u64 *hdr_flags, void *priv);
/* hdr_flags: */
#define LRO_IPV4 1 /* ip_hdr is IPv4 header */
#define LRO_TCP 2 /* tcpudp_hdr is TCP header */
/*
* get_frag_header: returns mac, tcp and ip header for packet in SKB
*
* @hdr_flags: Indicate what kind of LRO has to be done
* (IPv4/IPv6/TCP/UDP)
*/
int (*get_frag_header)(struct skb_frag_struct *frag, void **mac_hdr,
void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags,
void *priv);
};
/*
* Processes a SKB
*
* @lro_mgr: LRO manager to use
* @skb: SKB to aggregate
* @priv: Private data that may be used by driver functions
* (for example get_tcp_ip_hdr)
*/
void lro_receive_skb(struct net_lro_mgr *lro_mgr,
struct sk_buff *skb,
void *priv);
/*
* Forward all aggregated SKBs held by lro_mgr to network stack
*/
void lro_flush_all(struct net_lro_mgr *lro_mgr);
#endif
......@@ -406,14 +406,6 @@ config INET_XFRM_MODE_BEET
If unsure, say Y.
config INET_LRO
tristate "Large Receive Offload (ipv4/tcp)"
default y
---help---
Support for Large Receive Offload (ipv4/tcp).
If unsure, say Y.
config INET_DIAG
tristate "INET: socket monitoring interface"
default y
......
......@@ -32,7 +32,6 @@ obj-$(CONFIG_INET_ESP) += esp4.o
obj-$(CONFIG_INET_IPCOMP) += ipcomp.o
obj-$(CONFIG_INET_XFRM_TUNNEL) += xfrm4_tunnel.o
obj-$(CONFIG_INET_XFRM_MODE_BEET) += xfrm4_mode_beet.o
obj-$(CONFIG_INET_LRO) += inet_lro.o
obj-$(CONFIG_INET_TUNNEL) += tunnel4.o
obj-$(CONFIG_INET_XFRM_MODE_TRANSPORT) += xfrm4_mode_transport.o
obj-$(CONFIG_INET_XFRM_MODE_TUNNEL) += xfrm4_mode_tunnel.o
......
/*
* linux/net/ipv4/inet_lro.c
*
* Large Receive Offload (ipv4 / tcp)
*
* (C) Copyright IBM Corp. 2007
*
* Authors:
* Jan-Bernd Themann <themann@de.ibm.com>
* Christoph Raisch <raisch@de.ibm.com>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/if_vlan.h>
#include <linux/inet_lro.h>
#include <net/checksum.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jan-Bernd Themann <themann@de.ibm.com>");
MODULE_DESCRIPTION("Large Receive Offload (ipv4 / tcp)");
#define TCP_HDR_LEN(tcph) (tcph->doff << 2)
#define IP_HDR_LEN(iph) (iph->ihl << 2)
#define TCP_PAYLOAD_LENGTH(iph, tcph) \
(ntohs(iph->tot_len) - IP_HDR_LEN(iph) - TCP_HDR_LEN(tcph))
#define IPH_LEN_WO_OPTIONS 5
#define TCPH_LEN_WO_OPTIONS 5
#define TCPH_LEN_W_TIMESTAMP 8
#define LRO_MAX_PG_HLEN 64
#define LRO_INC_STATS(lro_mgr, attr) { lro_mgr->stats.attr++; }
/*
* Basic tcp checks whether packet is suitable for LRO
*/
static int lro_tcp_ip_check(const struct iphdr *iph, const struct tcphdr *tcph,
int len, const struct net_lro_desc *lro_desc)
{
/* check ip header: don't aggregate padded frames */
if (ntohs(iph->tot_len) != len)
return -1;
if (TCP_PAYLOAD_LENGTH(iph, tcph) == 0)
return -1;
if (iph->ihl != IPH_LEN_WO_OPTIONS)
return -1;
if (tcph->cwr || tcph->ece || tcph->urg || !tcph->ack ||
tcph->rst || tcph->syn || tcph->fin)
return -1;
if (INET_ECN_is_ce(ipv4_get_dsfield(iph)))
return -1;
if (tcph->doff != TCPH_LEN_WO_OPTIONS &&
tcph->doff != TCPH_LEN_W_TIMESTAMP)
return -1;
/* check tcp options (only timestamp allowed) */
if (tcph->doff == TCPH_LEN_W_TIMESTAMP) {
__be32 *topt = (__be32 *)(tcph + 1);
if (*topt != htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
| (TCPOPT_TIMESTAMP << 8)
| TCPOLEN_TIMESTAMP))
return -1;
/* timestamp should be in right order */
topt++;
if (lro_desc && after(ntohl(lro_desc->tcp_rcv_tsval),
ntohl(*topt)))
return -1;
/* timestamp reply should not be zero */
topt++;
if (*topt == 0)
return -1;
}
return 0;
}
static void lro_update_tcp_ip_header(struct net_lro_desc *lro_desc)
{
struct iphdr *iph = lro_desc->iph;
struct tcphdr *tcph = lro_desc->tcph;
__be32 *p;
__wsum tcp_hdr_csum;
tcph->ack_seq = lro_desc->tcp_ack;
tcph->window = lro_desc->tcp_window;
if (lro_desc->tcp_saw_tstamp) {
p = (__be32 *)(tcph + 1);
*(p+2) = lro_desc->tcp_rcv_tsecr;
}
csum_replace2(&iph->check, iph->tot_len, htons(lro_desc->ip_tot_len));
iph->tot_len = htons(lro_desc->ip_tot_len);
tcph->check = 0;
tcp_hdr_csum = csum_partial(tcph, TCP_HDR_LEN(tcph), 0);
lro_desc->data_csum = csum_add(lro_desc->data_csum, tcp_hdr_csum);
tcph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
lro_desc->ip_tot_len -
IP_HDR_LEN(iph), IPPROTO_TCP,
lro_desc->data_csum);
}
static __wsum lro_tcp_data_csum(struct iphdr *iph, struct tcphdr *tcph, int len)
{
__wsum tcp_csum;
__wsum tcp_hdr_csum;
__wsum tcp_ps_hdr_csum;
tcp_csum = ~csum_unfold(tcph->check);
tcp_hdr_csum = csum_partial(tcph, TCP_HDR_LEN(tcph), tcp_csum);
tcp_ps_hdr_csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
len + TCP_HDR_LEN(tcph),
IPPROTO_TCP, 0);
return csum_sub(csum_sub(tcp_csum, tcp_hdr_csum),
tcp_ps_hdr_csum);
}
static void lro_init_desc(struct net_lro_desc *lro_desc, struct sk_buff *skb,
struct iphdr *iph, struct tcphdr *tcph)
{
int nr_frags;
__be32 *ptr;
u32 tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
nr_frags = skb_shinfo(skb)->nr_frags;
lro_desc->parent = skb;
lro_desc->next_frag = &(skb_shinfo(skb)->frags[nr_frags]);
lro_desc->iph = iph;
lro_desc->tcph = tcph;
lro_desc->tcp_next_seq = ntohl(tcph->seq) + tcp_data_len;
lro_desc->tcp_ack = tcph->ack_seq;
lro_desc->tcp_window = tcph->window;
lro_desc->pkt_aggr_cnt = 1;
lro_desc->ip_tot_len = ntohs(iph->tot_len);
if (tcph->doff == 8) {
ptr = (__be32 *)(tcph+1);
lro_desc->tcp_saw_tstamp = 1;
lro_desc->tcp_rcv_tsval = *(ptr+1);
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,
tcp_data_len);
}
static inline void lro_clear_desc(struct net_lro_desc *lro_desc)
{
memset(lro_desc, 0, sizeof(struct net_lro_desc));
}
static void lro_add_common(struct net_lro_desc *lro_desc, struct iphdr *iph,
struct tcphdr *tcph, int tcp_data_len)
{
struct sk_buff *parent = lro_desc->parent;
__be32 *topt;
lro_desc->pkt_aggr_cnt++;
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) {
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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