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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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-
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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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-
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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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-
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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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-
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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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-
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-#define LRO_MAX_PG_HLEN 64
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-
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-#define LRO_INC_STATS(lro_mgr, attr) { lro_mgr->stats.attr++; }
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-
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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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-
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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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-
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- if (TCP_PAYLOAD_LENGTH(iph, tcph) == 0)
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- return -1;
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-
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- if (iph->ihl != IPH_LEN_WO_OPTIONS)
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- return -1;
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-
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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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-
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- if (INET_ECN_is_ce(ipv4_get_dsfield(iph)))
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- return -1;
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- return 0;
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-}
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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;
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- lro_desc->tcp_window = tcph->window;
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-
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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);
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- lro_desc->tcp_saw_tstamp = 1;
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- lro_desc->tcp_rcv_tsval = *(ptr+1);
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- lro_desc->tcp_rcv_tsecr = *(ptr+2);
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- }
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-
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- lro_desc->mss = tcp_data_len;
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- lro_desc->active = 1;
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-
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- 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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-
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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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-
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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)
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-{
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- struct sk_buff *parent = lro_desc->parent;
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- __be32 *topt;
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-
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- lro_desc->pkt_aggr_cnt++;
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- lro_desc->ip_tot_len += tcp_data_len;
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- lro_desc->tcp_next_seq += tcp_data_len;
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- lro_desc->tcp_window = tcph->window;
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- lro_desc->tcp_ack = tcph->ack_seq;
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-
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- /* don't update tcp_rcv_tsval, would not work with PAWS */
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- if (lro_desc->tcp_saw_tstamp) {
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- topt = (__be32 *) (tcph + 1);
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- lro_desc->tcp_rcv_tsecr = *(topt + 2);
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- }
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-
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- lro_desc->data_csum = csum_block_add(lro_desc->data_csum,
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- lro_tcp_data_csum(iph, tcph,
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- tcp_data_len),
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- parent->len);
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-
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- parent->len += tcp_data_len;
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- parent->data_len += tcp_data_len;
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- if (tcp_data_len > lro_desc->mss)
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- lro_desc->mss = tcp_data_len;
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-}
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-
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-static void lro_add_packet(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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- struct sk_buff *parent = lro_desc->parent;
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- int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph);
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-
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- lro_add_common(lro_desc, iph, tcph, tcp_data_len);
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-
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- skb_pull(skb, (skb->len - tcp_data_len));
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- parent->truesize += skb->truesize;
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-
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- if (lro_desc->last_skb)
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- lro_desc->last_skb->next = skb;
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- else
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- skb_shinfo(parent)->frag_list = skb;
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-
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- lro_desc->last_skb = skb;
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-}
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-
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-
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-static int lro_check_tcp_conn(struct net_lro_desc *lro_desc,
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- struct iphdr *iph,
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- struct tcphdr *tcph)
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-{
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- if ((lro_desc->iph->saddr != iph->saddr) ||
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- (lro_desc->iph->daddr != iph->daddr) ||
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- (lro_desc->tcph->source != tcph->source) ||
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- (lro_desc->tcph->dest != tcph->dest))
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- return -1;
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- return 0;
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-}
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-
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-static struct net_lro_desc *lro_get_desc(struct net_lro_mgr *lro_mgr,
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- struct net_lro_desc *lro_arr,
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- struct iphdr *iph,
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- struct tcphdr *tcph)
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-{
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- struct net_lro_desc *lro_desc = NULL;
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- struct net_lro_desc *tmp;
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- int max_desc = lro_mgr->max_desc;
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- int i;
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-
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- for (i = 0; i < max_desc; i++) {
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- tmp = &lro_arr[i];
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- if (tmp->active)
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- if (!lro_check_tcp_conn(tmp, iph, tcph)) {
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- lro_desc = tmp;
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- goto out;
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- }
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- }
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-
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- for (i = 0; i < max_desc; i++) {
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- if (!lro_arr[i].active) {
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- lro_desc = &lro_arr[i];
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- goto out;
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- }
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- }
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-
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- LRO_INC_STATS(lro_mgr, no_desc);
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-out:
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- return lro_desc;
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-}
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-
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-static void lro_flush(struct net_lro_mgr *lro_mgr,
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- struct net_lro_desc *lro_desc)
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-{
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- if (lro_desc->pkt_aggr_cnt > 1)
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- lro_update_tcp_ip_header(lro_desc);
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-
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- skb_shinfo(lro_desc->parent)->gso_size = lro_desc->mss;
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-
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- if (lro_mgr->features & LRO_F_NAPI)
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- netif_receive_skb(lro_desc->parent);
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- else
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- netif_rx(lro_desc->parent);
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-
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- LRO_INC_STATS(lro_mgr, flushed);
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- lro_clear_desc(lro_desc);
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-}
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-
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-static int __lro_proc_skb(struct net_lro_mgr *lro_mgr, struct sk_buff *skb,
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- void *priv)
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-{
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- struct net_lro_desc *lro_desc;
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- struct iphdr *iph;
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- struct tcphdr *tcph;
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- u64 flags;
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- int vlan_hdr_len = 0;
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-
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- if (!lro_mgr->get_skb_header ||
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- lro_mgr->get_skb_header(skb, (void *)&iph, (void *)&tcph,
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- &flags, priv))
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- goto out;
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-
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- if (!(flags & LRO_IPV4) || !(flags & LRO_TCP))
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- goto out;
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-
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- lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph);
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- if (!lro_desc)
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- goto out;
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-
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- if ((skb->protocol == htons(ETH_P_8021Q)) &&
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- !(lro_mgr->features & LRO_F_EXTRACT_VLAN_ID))
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- vlan_hdr_len = VLAN_HLEN;
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-
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- if (!lro_desc->active) { /* start new lro session */
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- if (lro_tcp_ip_check(iph, tcph, skb->len - vlan_hdr_len, NULL))
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- goto out;
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-
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- skb->ip_summed = lro_mgr->ip_summed_aggr;
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- lro_init_desc(lro_desc, skb, iph, tcph);
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- LRO_INC_STATS(lro_mgr, aggregated);
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- return 0;
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- }
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-
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- if (lro_desc->tcp_next_seq != ntohl(tcph->seq))
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- goto out2;
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-
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- if (lro_tcp_ip_check(iph, tcph, skb->len, lro_desc))
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- goto out2;
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-
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- lro_add_packet(lro_desc, skb, iph, tcph);
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- LRO_INC_STATS(lro_mgr, aggregated);
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-
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- if ((lro_desc->pkt_aggr_cnt >= lro_mgr->max_aggr) ||
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- lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu))
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- lro_flush(lro_mgr, lro_desc);
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-
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- return 0;
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-
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-out2: /* send aggregated SKBs to stack */
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- lro_flush(lro_mgr, lro_desc);
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-
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-out:
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- return 1;
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-}
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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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- if (__lro_proc_skb(lro_mgr, skb, priv)) {
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- if (lro_mgr->features & LRO_F_NAPI)
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- netif_receive_skb(skb);
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- else
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- netif_rx(skb);
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- }
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-}
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-EXPORT_SYMBOL(lro_receive_skb);
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-
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-void lro_flush_all(struct net_lro_mgr *lro_mgr)
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-{
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- int i;
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- struct net_lro_desc *lro_desc = lro_mgr->lro_arr;
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-
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- for (i = 0; i < lro_mgr->max_desc; i++) {
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- if (lro_desc[i].active)
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- lro_flush(lro_mgr, &lro_desc[i]);
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- }
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-}
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-EXPORT_SYMBOL(lro_flush_all);
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David S. Miller