[PATCH RFC,net-next 05/10] cls_flower: add statistics retrieval infrastructure and use it

[Pablo Neira Ayuso <pablo@netfilter.org>]

Provide a tc_cls_flower_stats structure that acts as container for
tc_cls_flower_offload, then restore stats on the TC actions. Hence
tcf_exts_stats_update() is not used from drivers.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c          |  4 ++--
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c  |  6 +++---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c       |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c |  2 +-
 drivers/net/ethernet/netronome/nfp/flower/offload.c   |  4 ++--
 include/net/pkt_cls.h                                 | 15 +++++++++++++++
 net/sched/cls_flower.c                                |  4 ++++
 7 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index 62652ffc8221..3505791777e7 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -1358,8 +1358,8 @@ static int bnxt_tc_get_flow_stats(struct bnxt *bp,
 	lastused = flow->lastused;
 	spin_unlock(&flow->stats_lock);
 
-	tcf_exts_stats_update(tc_flow_cmd->exts, stats.bytes, stats.packets,
-			      lastused);
+	tc_cls_flower_stats_update(tc_flow_cmd, stats.bytes, stats.packets,
+				   lastused);
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
index cff9d854bf51..74fe2ee4636e 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
@@ -807,9 +807,9 @@ int cxgb4_tc_flower_stats(struct net_device *dev,
 	if (ofld_stats->packet_count != packets) {
 		if (ofld_stats->prev_packet_count != packets)
 			ofld_stats->last_used = jiffies;
-		tcf_exts_stats_update(cls->exts, bytes - ofld_stats->byte_count,
-				      packets - ofld_stats->packet_count,
-				      ofld_stats->last_used);
+		tc_cls_flower_stats_update(cls, bytes - ofld_stats->byte_count,
+					   packets - ofld_stats->packet_count,
+					   ofld_stats->last_used);
 
 		ofld_stats->packet_count = packets;
 		ofld_stats->byte_count = bytes;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 5139e63daa74..bb29060c0351 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2906,7 +2906,7 @@ int mlx5e_stats_flower(struct mlx5e_priv *priv,
 
 	mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
 
-	tcf_exts_stats_update(f->exts, bytes, packets, lastuse);
+	tc_cls_flower_stats_update(f, bytes, packets, lastuse);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index 773dba2067ed..b3668b578e84 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -461,7 +461,7 @@ int mlxsw_sp_flower_stats(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_rule_get_stats;
 
-	tcf_exts_stats_update(f->exts, bytes, packets, lastuse);
+	tc_cls_flower_stats_update(f, bytes, packets, lastuse);
 
 	mlxsw_sp_acl_ruleset_put(mlxsw_sp, ruleset);
 	return 0;
diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 5a9986fccfa4..fbfec64767fb 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -577,8 +577,8 @@ nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 		return 0;
 
 	spin_lock_bh(&nfp_flow->lock);
-	tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes,
-			      nfp_flow->stats.pkts, nfp_flow->stats.used);
+	tc_cls_flower_stats_update(flow, nfp_flow->stats.bytes,
+				   nfp_flow->stats.pkts, nfp_flow->stats.used);
 
 	nfp_flow->stats.pkts = 0;
 	nfp_flow->stats.bytes = 0;
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index bc145265ebd5..c8e61e8b0257 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -731,6 +731,12 @@ enum tc_fl_command {
 	TC_CLSFLOWER_TMPLT_DESTROY,
 };
 
+struct tc_cls_flower_stats {
+	u64	pkts;
+	u64	bytes;
+	u64	lastused;
+};
+
 struct tc_cls_flower_offload {
 	struct tc_cls_common_offload common;
 	enum tc_fl_command command;
@@ -738,8 +744,17 @@ struct tc_cls_flower_offload {
 	struct flow_rule rule;
 	struct tcf_exts *exts;
 	u32 classid;
+	struct tc_cls_flower_stats stats;
 };
 
+static inline void tc_cls_flower_stats_update(struct tc_cls_flower_offload *cls_flower,
+					      u64 pkts, u64 bytes, u64 lastused)
+{
+	cls_flower->stats.pkts		= pkts;
+	cls_flower->stats.bytes		= bytes;
+	cls_flower->stats.lastused	= lastused;
+}
+
 enum tc_matchall_command {
 	TC_CLSMATCHALL_REPLACE,
 	TC_CLSMATCHALL_DESTROY,
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index a96a80f01c6d..a89f3370718f 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -460,6 +460,10 @@ static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
 
 	tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 			 &cls_flower, false);
+
+	tcf_exts_stats_update(&f->exts, cls_flower.stats.bytes,
+			      cls_flower.stats.pkts,
+			      cls_flower.stats.lastused);
 }
 
 static bool __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f,
-- 
2.11.0