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linux-stable/net/ipv6
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Paolo Abeni 9e8445a56c net: avoid unneeded atomic operation in ip*_append_data() 
After commit 694aba690d ("ipv4: factorize sk_wmem_alloc updates
done by __ip_append_data()") and commit 1f4c6eb240 ("ipv6:
factorize sk_wmem_alloc updates done by __ip6_append_data()"),
when transmitting sub MTU datagram, an addtional, unneeded atomic
operation is performed in ip*_append_data() to update wmem_alloc:
in the above condition the delta is 0.

The above cause small but measurable performance regression in UDP
xmit tput test with packet size below MTU.

This change avoids such overhead updating wmem_alloc only if
wmem_alloc_delta is non zero.

The error path is left intentionally unmodified: it's a slow path
and simplicity is preferred to performances.

Fixes: 694aba690d ("ipv4: factorize sk_wmem_alloc updates done by __ip_append_data()")
Fixes: 1f4c6eb240 ("ipv6: factorize sk_wmem_alloc updates done by __ip6_append_data()")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-04 11:53:08 -04:00
..
ila net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-01 19:49:34 -04:00
addrconf.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
addrconf_core.c net: ipv6: Make inet6addr_validator a blocking notifier 2017-10-20 13:15:07 +01:00
addrlabel.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
af_inet6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-03-31 23:33:04 -04:00
ah6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-11-15 11:56:19 -08:00
anycast.c net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
calipso.c net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
datagram.c ipv6: add a wrapper for ip6_dst_store() with flowi6 checks 2018-04-04 11:31:57 -04:00
esp6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-17 00:10:42 -05:00
esp6_offload.c esp: check the NETIF_F_HW_ESP_TX_CSUM bit before segmenting 2018-02-27 10:46:01 +01:00
exthdrs.c ipv6: sr: fix TLVs not being copied using setsockopt 2018-01-10 16:03:55 -05:00
exthdrs_core.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
exthdrs_offload.c
fib6_notifier.c net: Add module reference to FIB notifiers 2017-09-01 20:33:42 -07:00
fib6_rules.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
fou6.c fou: make local function static 2017-05-21 13:42:36 -04:00
icmp.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
inet6_connection_sock.c
inet6_hashtables.c inet: Add a 2nd listener hashtable (port+addr) 2017-12-03 10:18:28 -05:00
ip6_checksum.c udplite: fix partial checksum initialization 2018-02-16 15:57:42 -05:00
ip6_fib.c net/ipv6: Move call_fib6_entry_notifiers up for route adds 2018-03-29 14:10:31 -04:00
ip6_flowlabel.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ip6_gre.c ip6_gre: remove redundant 'tunnel' setting in ip6erspan_tap_init() 2018-04-01 14:02:32 -04:00
ip6_icmp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ip6_input.c
ip6_offload.c gso: fix payload length when gso_size is zero 2017-10-08 10:12:15 -07:00
ip6_offload.h
ip6_output.c net: avoid unneeded atomic operation in ip*_append_data() 2018-04-04 11:53:08 -04:00
ip6_tunnel.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ip6_udp_tunnel.c
ip6_vti.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-01 19:49:34 -04:00
ip6mr.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ipcomp6.c
ipv6_sockglue.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
Kconfig ipmr,ipmr6: Define a uniform vif_device 2018-03-01 13:13:23 -05:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mcast.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
mcast_snoop.c
mip6.c
ndisc.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
netfilter.c netfilter: use skb_to_full_sk in ip6_route_me_harder 2018-02-25 20:51:13 +01:00
output_core.c net: accept UFO datagrams from tuntap and packet 2017-11-24 01:37:35 +09:00
ping.c ipv6: allow to cache dst for a connected sk in ip6_sk_dst_lookup_flow() 2018-04-04 11:31:57 -04:00
proc.c inet: frags: break the 2GB limit for frags storage 2018-03-31 23:25:39 -04:00
protocol.c
raw.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
reassembly.c ipv6: frags: fix /proc/sys/net/ipv6/ip6frag_low_thresh 2018-04-02 10:10:50 -04:00
route.c ipv6: add a wrapper for ip6_dst_store() with flowi6 checks 2018-04-04 11:31:57 -04:00
seg6.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
seg6_hmac.c ipv6: sr: Use ARRAY_SIZE macro 2017-09-01 18:35:23 -07:00
seg6_iptunnel.c ipv6: sr: fix seg6 encap performances with TSO enabled 2018-03-30 14:14:33 -04:00
seg6_local.c net/ipv6: Pass skb to route lookup 2018-03-04 13:04:22 -05:00
sit.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
syncookies.c net/ipv4: disable SMC TCP option with SYN Cookies 2018-03-25 20:53:54 -04:00
sysctl_net_ipv6.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
tcp_ipv6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-03-31 23:33:04 -04:00
tcpv6_offload.c gso: validate gso_type in GSO handlers 2018-01-22 16:01:30 -05:00
tunnel6.c
udp.c ipv6: udp: set dst cache for a connected sk if current not valid 2018-04-04 11:31:57 -04:00
udp_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp_offload.c gso: validate gso_type in GSO handlers 2018-01-22 16:01:30 -05:00
udplite.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
xfrm6_input.c xfrm: Reinject transport-mode packets through tasklet 2017-12-19 08:23:21 +01:00
xfrm6_mode_beet.c networking: make skb_pull & friends return void pointers 2017-06-16 11:48:39 -04:00
xfrm6_mode_ro.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_transport.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_tunnel.c xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto 2018-03-07 10:54:29 +01:00
xfrm6_output.c net: xfrm: use skb_gso_validate_network_len() to check gso sizes 2018-03-04 17:49:17 -05:00
xfrm6_policy.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
xfrm6_protocol.c
xfrm6_state.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
xfrm6_tunnel.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00