forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

net: restore gnet_stats_basic to previous definition

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

10
include/net/gen_stats.h
View file

@ -28,7 +28,7 @@ extern int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
spinlock_t *lock, struct gnet_dump *d);
extern int gnet_stats_copy_basic(struct gnet_dump *d,
struct gnet_stats_basic *b);
struct gnet_stats_basic_packed *b);
extern int gnet_stats_copy_rate_est(struct gnet_dump *d,
struct gnet_stats_rate_est *r);
extern int gnet_stats_copy_queue(struct gnet_dump *d,
@ -37,14 +37,14 @@ extern int gnet_stats_copy_app(struct gnet_dump *d, void *st, int len);
extern int gnet_stats_finish_copy(struct gnet_dump *d);
extern int gen_new_estimator(struct gnet_stats_basic *bstats,
extern int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock, struct nlattr *opt);
extern void gen_kill_estimator(struct gnet_stats_basic *bstats,
extern void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est);
extern int gen_replace_estimator(struct gnet_stats_basic *bstats,
extern int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock, struct nlattr *opt);
extern bool gen_estimator_active(const struct gnet_stats_basic *bstats,
extern bool gen_estimator_active(const struct gnet_stats_basic_packed *bstats,
const struct gnet_stats_rate_est *rate_est);
#endif