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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
Download Patch File Download Diff File Expand all files Collapse all files

12
net/core/gen_estimator.c
View File

@ -81,7 +81,7 @@
struct gen_estimator
{
struct list_head list;
struct gnet_stats_basic *bstats;
struct gnet_stats_basic_packed *bstats;
struct gnet_stats_rate_est *rate_est;
spinlock_t *stats_lock;
int ewma_log;
@ -165,7 +165,7 @@ static void gen_add_node(struct gen_estimator *est)
}
static
struct gen_estimator *gen_find_node(const struct gnet_stats_basic *bstats,
struct gen_estimator *gen_find_node(const struct gnet_stats_basic_packed *bstats,
const struct gnet_stats_rate_est *rate_est)
{
struct rb_node *p = est_root.rb_node;
@ -202,7 +202,7 @@ struct gen_estimator *gen_find_node(const struct gnet_stats_basic *bstats,
*
* NOTE: Called under rtnl_mutex
*/
int gen_new_estimator(struct gnet_stats_basic *bstats,
int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock,
struct nlattr *opt)
@ -262,7 +262,7 @@ static void __gen_kill_estimator(struct rcu_head *head)
*
* NOTE: Called under rtnl_mutex
*/
void gen_kill_estimator(struct gnet_stats_basic *bstats,
void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est)
{
struct gen_estimator *e;
@ -292,7 +292,7 @@ EXPORT_SYMBOL(gen_kill_estimator);
*
* Returns 0 on success or a negative error code.
*/
int gen_replace_estimator(struct gnet_stats_basic *bstats,
int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock, struct nlattr *opt)
{
@ -308,7 +308,7 @@ EXPORT_SYMBOL(gen_replace_estimator);
*
* Returns true if estimator is active, and false if not.
*/
bool gen_estimator_active(const struct gnet_stats_basic *bstats,
bool gen_estimator_active(const struct gnet_stats_basic_packed *bstats,
const struct gnet_stats_rate_est *rate_est)
{
ASSERT_RTNL();