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

5
include/linux/gen_stats.h
View File

@ -19,6 +19,11 @@ enum {
* @packets: number of seen packets
*/
struct gnet_stats_basic
{
__u64 bytes;
__u32 packets;
};
struct gnet_stats_basic_packed
{
__u64 bytes;
__u32 packets;

2
include/net/act_api.h
View File

@ -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;

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

2
include/net/netfilter/xt_rateest.h
View File

@ -8,7 +8,7 @@ struct xt_rateest {
spinlock_t lock;
struct gnet_estimator params;
struct gnet_stats_rate_est rstats;
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
};
extern struct xt_rateest *xt_rateest_lookup(const char *name);

2
include/net/sch_generic.h
View File

@ -72,7 +72,7 @@ struct Qdisc
*/
unsigned long state;
struct sk_buff_head q;
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
};

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();

11
net/core/gen_stats.c
View File

@ -106,16 +106,21 @@ gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
* if the room in the socket buffer was not sufficient.
*/
int
gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b)
gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
{
if (d->compat_tc_stats) {
d->tc_stats.bytes = b->bytes;
d->tc_stats.packets = b->packets;
}
if (d->tail)
return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b));
if (d->tail) {
struct gnet_stats_basic sb;
memset(&sb, 0, sizeof(sb));
sb.bytes = b->bytes;
sb.packets = b->packets;
return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
}
return 0;
}

2
net/netfilter/xt_RATEEST.c
View File

@ -74,7 +74,7 @@ static unsigned int
xt_rateest_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
const struct xt_rateest_target_info *info = par->targinfo;
struct gnet_stats_basic *stats = &info->est->bstats;
struct gnet_stats_basic_packed *stats = &info->est->bstats;
spin_lock_bh(&info->est->lock);
stats->bytes += skb->len;

2
net/sched/sch_atm.c
View File

@ -49,7 +49,7 @@ struct atm_flow_data {
struct socket *sock; /* for closing */
u32 classid; /* x:y type ID */
int ref; /* reference count */
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct atm_flow_data *next;
struct atm_flow_data *excess; /* flow for excess traffic;

2
net/sched/sch_cbq.c
View File

@ -128,7 +128,7 @@ struct cbq_class
long avgidle;
long deficit; /* Saved deficit for WRR */
psched_time_t penalized;
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
struct tc_cbq_xstats xstats;

2
net/sched/sch_drr.c
View File

@ -22,7 +22,7 @@ struct drr_class {
unsigned int refcnt;
unsigned int filter_cnt;
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
struct list_head alist;

2
net/sched/sch_hfsc.c
View File

@ -116,7 +116,7 @@ struct hfsc_class
struct Qdisc_class_common cl_common;
unsigned int refcnt; /* usage count */
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
unsigned int level; /* class level in hierarchy */

2
net/sched/sch_htb.c
View File

@ -74,7 +74,7 @@ enum htb_cmode {
struct htb_class {
struct Qdisc_class_common common;
/* general class parameters */
struct gnet_stats_basic bstats;
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
struct tc_htb_xstats xstats; /* our special stats */