kernel-ark/net/l2tp
Eric Dumazet 87c084a980 l2tp: dont play with skb->truesize
Andrew Savchenko reported a DNS failure and we diagnosed that
some UDP sockets were unable to send more packets because their
sk_wmem_alloc was corrupted after a while (tx_queue column in
following trace)

$ cat /proc/net/udp
  sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
...
  459: 00000000:0270 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 4507 2 ffff88003d612380 0
  466: 00000000:0277 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 4802 2 ffff88003d613180 0
  470: 076A070A:007B 00000000:0000 07 FFFF4600:00000000 00:00000000 00000000   123        0 5552 2 ffff880039974380 0
  470: 010213AC:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 4986 2 ffff88003dbd3180 0
  470: 010013AC:007B 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 4985 2 ffff88003dbd2e00 0
  470: 00FCA8C0:007B 00000000:0000 07 FFFFFB00:00000000 00:00000000 00000000     0        0 4984 2 ffff88003dbd2a80 0
...

Playing with skb->truesize is tricky, especially when
skb is attached to a socket, as we can fool memory charging.

Just remove this code, its not worth trying to be ultra
precise in xmit path.

Reported-by: Andrew Savchenko <bircoph@gmail.com>
Tested-by: Andrew Savchenko <bircoph@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-08 01:49:49 -05:00
..
Kconfig l2tp: fix compile error when CONFIG_IPV6=m and CONFIG_L2TP=y 2012-09-21 12:06:46 -04:00
l2tp_core.c l2tp: dont play with skb->truesize 2013-02-08 01:49:49 -05:00
l2tp_core.h l2tp: prevent l2tp_tunnel_delete racing with userspace close 2013-01-29 15:43:02 -05:00
l2tp_debugfs.c net: l2tp: Standardize logging styles 2012-05-17 04:34:38 -04:00
l2tp_eth.c l2tp: fix oops in l2tp_eth_create() error path 2012-11-02 21:56:35 -04:00
l2tp_ip6.c l2tp: correctly handle ancillary data in the ip6 recv path 2013-01-31 13:53:09 -05:00
l2tp_ip.c l2tp: fix a race in l2tp_ip_sendmsg() 2012-06-08 14:30:51 -07:00
l2tp_netlink.c l2tp: session is an array not a pointer 2012-10-26 03:46:41 -04:00
l2tp_ppp.c l2tp: dont play with skb->truesize 2013-02-08 01:49:49 -05:00
Makefile l2tp: introduce L2TPv3 IP encapsulation support for IPv6 2012-05-01 09:30:55 -04:00