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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 <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2009-08-16 09:36:49 +00:00 • committed by David S. Miller
commit c1a8f1f1c8
13 changed files with 33 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

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 */