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net: restore gnet_stats_basic to previous definition

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In 5e140dfc1f "net: reorder struct Qdisc
for better SMP performance" the definition of struct gnet_stats_basic
changed incompatibly, as copies of this struct are shipped to
userland via netlink.

Restoring old behavior is not welcome, for performance reason.

Fix is to use a private structure for kernel, and
teach gnet_stats_copy_basic() to convert from kernel to user land,
using legacy structure (struct gnet_stats_basic)

Based on a report and initial patch from Michael Spang.

Reported-by: Michael Spang <mspang@csclub.uwaterloo.ca>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-08-16 09:36:49 +00:00 • committed by David S. Miller
parent c6ba973b8f
commit c1a8f1f1c8
13 changed files with 33 additions and 23 deletions
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2
include/net/act_api.h
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@ -16,7 +16,7 @@ struct tcf_common {
u32 tcfc_capab;
int tcfc_action;
struct tcf_t tcfc_tm;
struct gnet_stats_basic tcfc_bstats;
struct gnet_stats_basic_packed tcfc_bstats;
struct gnet_stats_queue tcfc_qstats;
struct gnet_stats_rate_est tcfc_rate_est;
spinlock_t tcfc_lock;