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linux-next/net/ipv4
Ananda Raju e89e9cf539 [IPv4/IPv6]: UFO Scatter-gather approach
Attached is kernel patch for UDP Fragmentation Offload (UFO) feature.

1. This patch incorporate the review comments by Jeff Garzik.
2. Renamed USO as UFO (UDP Fragmentation Offload)
3. udp sendfile support with UFO

This patches uses scatter-gather feature of skb to generate large UDP
datagram. Below is a "how-to" on changes required in network device
driver to use the UFO interface.

UDP Fragmentation Offload (UFO) Interface:
-------------------------------------------
UFO is a feature wherein the Linux kernel network stack will offload the
IP fragmentation functionality of large UDP datagram to hardware. This
will reduce the overhead of stack in fragmenting the large UDP datagram to
MTU sized packets

1) Drivers indicate their capability of UFO using
dev->features |= NETIF_F_UFO | NETIF_F_HW_CSUM | NETIF_F_SG

NETIF_F_HW_CSUM is required for UFO over ipv6.

2) UFO packet will be submitted for transmission using driver xmit routine.
UFO packet will have a non-zero value for

"skb_shinfo(skb)->ufo_size"

skb_shinfo(skb)->ufo_size will indicate the length of data part in each IP
fragment going out of the adapter after IP fragmentation by hardware.

skb->data will contain MAC/IP/UDP header and skb_shinfo(skb)->frags[]
contains the data payload. The skb->ip_summed will be set to CHECKSUM_HW
indicating that hardware has to do checksum calculation. Hardware should
compute the UDP checksum of complete datagram and also ip header checksum of
each fragmented IP packet.

For IPV6 the UFO provides the fragment identification-id in
skb_shinfo(skb)->ip6_frag_id. The adapter should use this ID for generating
IPv6 fragments.

Signed-off-by: Ananda Raju <ananda.raju@neterion.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (forwarded)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-10-28 16:30:00 -02:00
..
ipvs [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
netfilter [NETFILTER] ip_conntrack: Make "hashsize" conntrack parameter writable 2005-10-26 00:19:27 -02:00
af_inet.c [IPV4] fib_trie: fix proc interface 2005-09-09 13:35:42 -07:00
ah4.c [CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL 2005-09-01 17:44:29 -07:00
arp.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
datagram.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
devinet.c [IPV4]: Fix setting broadcast for SIOCSIFNETMASK 2005-10-26 01:20:21 -02:00
esp4.c [IPSEC] Fix block size/MTU bugs in ESP 2005-10-10 21:11:34 -07:00
fib_frontend.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
fib_hash.c [NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers 2005-08-29 16:11:18 -07:00
fib_lookup.h [IPV4]: Prepare FIB core for RCU. 2005-08-29 16:08:31 -07:00
fib_rules.c [NETLINK]: Correctly set NLM_F_MULTI without checking the pid 2005-06-18 22:54:12 -07:00
fib_semantics.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
fib_trie.c [IPV4]: Kill redundant rcu_dereference on fa_info 2005-10-26 00:25:03 -02:00
icmp.c [NET]: Wider use of for_each_*cpu() 2005-10-25 23:54:01 -02:00
igmp.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
inet_connection_sock.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
inet_diag.c [NETLINK]: Add "groups" argument to netlink_kernel_create 2005-08-29 16:01:11 -07:00
inet_hashtables.c [NET]: Introduce inet_connection_sock 2005-08-29 15:43:19 -07:00
inet_timewait_sock.c [TWSK]: Grab the module refcount for timewait sockets 2005-10-10 21:25:23 -07:00
inetpeer.c [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
ip_forward.c [IPV4]: Remove some dead code from ip_forward() 2005-08-29 16:03:06 -07:00
ip_fragment.c [IPV4]: Reassembly trim not clearing CHECKSUM_HW 2005-09-06 15:51:48 -07:00
ip_gre.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
ip_input.c [NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers 2005-08-29 16:11:18 -07:00
ip_options.c [IP]: Introduce ip_options_get_from_user 2005-08-29 16:01:39 -07:00
ip_output.c [IPv4/IPv6]: UFO Scatter-gather approach 2005-10-28 16:30:00 -02:00
ip_sockglue.c [IP]: Introduce ip_options_get_from_user 2005-08-29 16:01:39 -07:00
ipcomp.c [CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL 2005-09-01 17:44:29 -07:00
ipconfig.c [NET]: fix-up schedule_timeout() usage 2005-09-12 14:15:34 -07:00
ipip.c [NET]: fix oops after tunnel module unload 2005-07-30 17:46:44 -07:00
ipmr.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
Kconfig [INET_DIAG]: Move the tcp_diag interface to the proper place 2005-08-29 15:57:54 -07:00
Makefile [INET_DIAG]: Move the tcp_diag interface to the proper place 2005-08-29 15:57:54 -07:00
multipath_drr.c [IPV4]: possible cleanups 2005-08-29 15:33:20 -07:00
multipath_random.c [IPV4]: Multipath modules need a license to prevent kernel tainting. 2005-06-13 14:29:06 -07:00
multipath_rr.c [IPV4]: Multipath modules need a license to prevent kernel tainting. 2005-06-13 14:29:06 -07:00
multipath_wrandom.c [IPV4]: Multipath modules need a license to prevent kernel tainting. 2005-06-13 14:29:06 -07:00
multipath.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
netfilter.c [NETFILTER]: Move reroute-after-queue code up to the nf_queue layer. 2005-08-29 15:36:19 -07:00
proc.c [NET]: Wider use of for_each_*cpu() 2005-10-25 23:54:01 -02:00
protocol.c [TCP]: Move the tcp sock states to net/tcp_states.h 2005-08-29 15:41:54 -07:00
raw.c [PATCH] raw_sendmsg DoS on 2.6 2005-09-19 18:45:42 -07:00
route.c [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 2005-10-03 14:35:55 -07:00
syncookies.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
sysctl_net_ipv4.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
tcp_bic.c [TCP]: BIC coding bug in Linux 2.6.13 2005-10-05 12:09:31 -07:00
tcp_cong.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_diag.c [INET_DIAG]: Move the tcp_diag interface to the proper place 2005-08-29 15:57:54 -07:00
tcp_highspeed.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_htcp.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_hybla.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_input.c [TCP]: Clear stale pred_flags when snd_wnd changes 2005-10-27 15:11:04 -02:00
tcp_ipv4.c [INET]: speedup inet (tcp/dccp) lookups 2005-10-03 14:13:38 -07:00
tcp_minisocks.c [TCP]: Set default congestion control correctly for incoming connections. 2005-09-21 00:19:46 -07:00
tcp_output.c [TCP] Allow len == skb->len in tcp_fragment 2005-10-20 17:13:13 -02:00
tcp_scalable.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_timer.c [ICSK]: Move TCP congestion avoidance members to icsk 2005-08-29 15:56:18 -07:00
tcp_vegas.c [INET_DIAG]: Rename tcp_diag.[ch] to inet_diag.[ch] 2005-08-29 15:57:48 -07:00
tcp_westwood.c [INET_DIAG]: Rename tcp_diag.[ch] to inet_diag.[ch] 2005-08-29 15:57:48 -07:00
tcp.c [TCP]: Fix TCP_OFF() bug check introduced by previous change. 2005-09-05 18:55:48 -07:00
udp.c [IPV4] udp: trim forgets about CHECKSUM_HW 2005-09-08 12:32:21 -07:00
xfrm4_input.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xfrm4_output.c [IPSEC]: Add XFRM_STATE_NOPMTUDISC flag 2005-06-20 13:21:43 -07:00
xfrm4_policy.c [IPSEC]: Store idev entries 2005-05-03 16:27:10 -07:00
xfrm4_state.c [IPV4]: possible cleanups 2005-08-29 15:33:20 -07:00
xfrm4_tunnel.c [NET]: Make ipip/ip6_tunnel independant of XFRM 2005-07-19 14:03:34 -07:00