netdev - [RFC PATCH net-next 2/3] flow_offload: restore ability to collect separate stats per action

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Date:   Fri, 3 May 2019 16:06:55 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        "Pablo Neira Ayuso" <pablo@...filter.org>,
        David Miller <davem@...emloft.net>
CC:     netdev <netdev@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Anjali Singhai Jain <anjali.singhai@...el.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "Or Gerlitz" <gerlitz.or@...il.com>
Subject: [RFC PATCH net-next 2/3] flow_offload: restore ability to collect
 separate stats per action

Introduce a new offload command TC_CLSFLOWER_STATS_BYINDEX, similar to
 the existing TC_CLSFLOWER_STATS but specifying an action_index (the
 tcfa_index of the action), which is called for each stats-having action
 on the rule.  Drivers should implement either, but not both, of these
 commands.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 include/net/pkt_cls.h  |  2 ++
 net/sched/cls_flower.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index d5e7a1af346f..0e33c52c23a8 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -762,6 +762,7 @@ enum tc_fl_command {
 	TC_CLSFLOWER_REPLACE,
 	TC_CLSFLOWER_DESTROY,
 	TC_CLSFLOWER_STATS,
+	TC_CLSFLOWER_STATS_BYINDEX,
 	TC_CLSFLOWER_TMPLT_CREATE,
 	TC_CLSFLOWER_TMPLT_DESTROY,
 };
@@ -773,6 +774,7 @@ struct tc_cls_flower_offload {
 	struct flow_rule *rule;
 	struct flow_stats stats;
 	u32 classid;
+	u32 action_index; /* for TC_CLSFLOWER_STATS_BYINDEX */
 };
 
 static inline struct flow_rule *
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index f6685fc53119..be339cd6a86e 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -474,6 +474,10 @@ static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f,
 {
 	struct tc_cls_flower_offload cls_flower = {};
 	struct tcf_block *block = tp->chain->block;
+#ifdef CONFIG_NET_CLS_ACT
+	struct tc_action *a;
+	int i;
+#endif
 
 	if (!rtnl_held)
 		rtnl_lock();
@@ -489,6 +493,32 @@ static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f,
 			      cls_flower.stats.pkts,
 			      cls_flower.stats.lastused);
 
+#ifdef CONFIG_NET_CLS_ACT
+	for (i = 0; i < f->exts.nr_actions; i++) {
+		a = f->exts.actions[i];
+
+		if (!a->ops->stats_update)
+			continue;
+		memset(&cls_flower, 0, sizeof(cls_flower));
+		tc_cls_common_offload_init(&cls_flower.common, tp, f->flags, NULL);
+		cls_flower.command = TC_CLSFLOWER_STATS_BYINDEX;
+		cls_flower.cookie = (unsigned long) f;
+		cls_flower.classid = f->res.classid;
+		cls_flower.action_index = a->tcfa_index;
+
+		tc_setup_cb_call(block, TC_SETUP_CLSFLOWER, &cls_flower, false);
+
+		/* Some ->stats_update() use percpu variables and must thus be
+		 * called with preemption disabled.
+		 */
+		preempt_disable();
+		a->ops->stats_update(a, cls_flower.stats.bytes,
+				     cls_flower.stats.pkts,
+				     cls_flower.stats.lastused, true);
+		preempt_enable();
+	}
+#endif
+
 	if (!rtnl_held)
 		rtnl_unlock();
 }