netdev - [PATCH net-next 3/3] net_sched: add TCA_STATS

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Date:   Mon,  4 Nov 2019 19:13:15 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH net-next 3/3] 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@...gle.com>
---
 include/uapi/linux/gen_stats.h | 1 +
 net/core/gen_stats.c           | 9 +++++++--
 net/sched/act_api.c            | 2 ++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/gen_stats.h b/include/uapi/linux/gen_stats.h
index 4eaacdf452e3b34f8f813046b801bfc1e6bdd2d4..852f234f1fd634b5d4d5444fc8e2f2e45c4f0839 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 fe33e2a9841e698dc1a0ac086086fa9832c0b514..1d653fbfcf52a95f0c8acdeb1ce1b0b418177351 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 6284c552e943d1ffa45d59a28eac2c37152e4875..bda1ba25c59e973709998b7e6279eee30589cbb8 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 */
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog