net_sched: add TCA_STATS_PKT64 attribute
Now the kernel uses 64bit packet counters in scheduler layer,
we want to export these counters to user space.
Instead risking breaking user space by adding fields
to struct gnet_stats_basic, add a new TCA_STATS_PKT64.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/gen_stats.h b/include/uapi/linux/gen_stats.h
index 4eaacdf..852f234 100644
--- a/include/uapi/linux/gen_stats.h
+++ b/include/uapi/linux/gen_stats.h
@@ -13,6 +13,7 @@ enum {
TCA_STATS_RATE_EST64,
TCA_STATS_PAD,
TCA_STATS_BASIC_HW,
+ TCA_STATS_PKT64,
__TCA_STATS_MAX,
};
#define TCA_STATS_MAX (__TCA_STATS_MAX - 1)
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index fe33e2a..1d653fb 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -175,12 +175,17 @@ ___gnet_stats_copy_basic(const seqcount_t *running,
if (d->tail) {
struct gnet_stats_basic sb;
+ int res;
memset(&sb, 0, sizeof(sb));
sb.bytes = bstats.bytes;
sb.packets = bstats.packets;
- return gnet_stats_copy(d, type, &sb, sizeof(sb),
- TCA_STATS_PAD);
+ res = gnet_stats_copy(d, type, &sb, sizeof(sb), TCA_STATS_PAD);
+ if (res < 0 || sb.packets == bstats.packets)
+ return res;
+ /* emit 64bit stats only if needed */
+ return gnet_stats_copy(d, TCA_STATS_PKT64, &bstats.packets,
+ sizeof(bstats.packets), TCA_STATS_PAD);
}
return 0;
}
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 6284c55..bda1ba2 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -188,6 +188,8 @@ static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
+ nla_total_size(0) /* TCA_ACT_STATS nested */
/* TCA_STATS_BASIC */
+ nla_total_size_64bit(sizeof(struct gnet_stats_basic))
+ /* TCA_STATS_PKT64 */
+ + nla_total_size_64bit(sizeof(u64))
/* TCA_STATS_QUEUE */
+ nla_total_size_64bit(sizeof(struct gnet_stats_queue))
+ nla_total_size(0) /* TCA_OPTIONS nested */
