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Eric Dumazet 87151b8689 net: allow pskb_expand_head() to get maximum tailroom 
Marc Merlin reported many order-1 allocations failures in TX path on its
wireless setup, that dont make any sense with MTU=1500 network, and non
SG capable hardware.

Turns out part of the problem comes from pskb_expand_head() not using
ksize() to get exact head size given by kmalloc(). Doing the same thing
than __alloc_skb() allows more tailroom in skb and can prevent future
reallocations.

As a bonus, struct skb_shared_info becomes cache line aligned.

Reported-by: Marc MERLIN <marc@merlins.org>
Tested-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2012-04-11 10:10:43 -04:00
..
Makefile sock_diag: Move the sock_ code to net/core/ 2011-12-06 13:58:02 -05:00
datagram.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
dev.c net: fix /proc/net/dev regression 2012-04-03 17:23:23 -04:00
dev_addr_lists.c net: fix /proc/net/dev regression 2012-04-03 17:23:23 -04:00
drop_monitor.c net,rcu: convert call_rcu(free_dm_hw_stat) to kfree_rcu() 2011-05-07 22:50:59 -07:00
dst.c net: Rename dst_get_neighbour{, _raw} to dst_get_neighbour_noref{, _raw}. 2011-12-05 15:20:19 -05:00
ethtool.c net: Support RX-ALL feature flag. 2012-02-24 01:42:07 -08:00
fib_rules.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
filter.c bpf jit: Make the filter.c::__load_pointer helper non-static for the jits 2012-04-03 18:01:03 -04:00
flow.c net: Add a flow_cache_flush_deferred function 2011-12-21 16:48:08 -05:00
flow_dissector.c net: flow_dissector.c missing include linux/export.h 2012-01-24 16:03:33 -05:00
gen_estimator.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
gen_stats.c net/core: EXPORT_SYMBOL cleanups 2010-07-12 12:57:55 -07:00
iovec.c net: get rid of some pointless casts to sockaddr 2012-03-11 19:11:22 -07:00
kmap_skb.h net: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:27 +08:00
link_watch.c net: linkwatch: allow vlans to get carrier changes faster 2011-09-15 15:36:34 -04:00
neighbour.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-02-26 21:55:51 -05:00
net-sysfs.c static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
net-sysfs.h xps: Add CONFIG_XPS 2010-11-28 18:24:14 -08:00
net-traces.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
net_namespace.c netns: fix net_alloc_generic() 2012-01-26 13:36:19 -05:00
netevent.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
netpoll.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-02-19 16:03:15 -05:00
netprio_cgroup.c Merge branch 'for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2012-03-20 18:11:21 -07:00
pktgen.c pktgen: Fix unsigned function that is returning negative vals 2012-01-22 15:08:44 -05:00
request_sock.c ipv4:correct description for tcp_max_syn_backlog 2011-12-06 13:02:28 -05:00
rtnetlink.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scm.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
secure_seq.c net: fix some sparse errors 2012-01-17 10:31:12 -05:00
skbuff.c net: allow pskb_expand_head() to get maximum tailroom 2012-04-11 10:10:43 -04:00
sock.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
sock_diag.c sock_diag: Introduce the meminfo nla core (v2) 2011-12-30 16:42:19 -05:00
stream.c net: Fix the condition passed to sk_wait_event() 2010-10-03 20:41:32 -07:00
sysctl_net_core.c static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
timestamping.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
user_dma.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
utils.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00