ipv4: Remove inet_lro library (7bbf3cae) · Commits · EulixOS / Software / Kernel

include/linux/inet_lro.h

deleted100644 → 0

+0 −142

Original line number	Diff line number	Diff line
		/*
		* 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

net/ipv4/Kconfig

+0 −8

Original line number	Diff line number	Diff line
		@@ -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

net/ipv4/Makefile

+0 −1

Original line number	Diff line number	Diff line
		@@ -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

net/ipv4/inet_lro.c

deleted100644 → 0

+0 −374

Original line number	Diff line number	Diff line
		/*
		* 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);