netdev - [PATCH iproute2-next v2 3/4] ip: ipnexthop: Support dumping next hop group HW stats

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Message-ID: <51d1686b5a2124b67a796945e117ce824c012811.1710427655.git.petrm@nvidia.com>
Date: Thu, 14 Mar 2024 15:52:14 +0100
From: Petr Machata <petrm@...dia.com>
To: David Ahern <dsahern@...nel.org>, Stephen Hemminger
	<stephen@...workplumber.org>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>, "Jakub
 Kicinski" <kuba@...nel.org>, <mlxsw@...dia.com>
Subject: [PATCH iproute2-next v2 3/4] ip: ipnexthop: Support dumping next hop group HW stats

Besides SW datapath stats, the kernel also support collecting statistics
from HW datapath, for nexthop groups offloaded to HW. Request that these be
collected when ip is given "-s -s", similarly to how "ip link" shows more
statistics in that case.

Besides the statistics themselves, also show whether the collection of HW
statistics was in fact requested, and whether any driver actually
implemented the request.

Signed-off-by: Petr Machata <petrm@...dia.com>
---
 ip/ipnexthop.c | 28 ++++++++++++++++++++++++++++
 ip/nh_common.h |  5 +++++
 2 files changed, 33 insertions(+)

diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index cba3d934..6c5d524b 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -327,6 +327,11 @@ static void parse_nh_group_stats_rta(const struct rtattr *grp_stats_attr,
 			rta = tb[NHA_GROUP_STATS_ENTRY_PACKETS];
 			nh_grp_stats->packets = rta_getattr_uint(rta);
 		}
+
+		if (tb[NHA_GROUP_STATS_ENTRY_PACKETS_HW]) {
+			rta = tb[NHA_GROUP_STATS_ENTRY_PACKETS_HW];
+			nh_grp_stats->packets_hw = rta_getattr_uint(rta);
+		}
 	}
 }
 
@@ -395,6 +400,9 @@ static void print_nh_grp_stats(const struct nh_entry *nhe)
 			   nhe->nh_grp_stats[i].nh_id);
 		print_u64(PRINT_ANY, "packets", " packets %llu",
 			  nhe->nh_grp_stats[i].packets);
+		if (show_stats > 1)
+			print_u64(PRINT_ANY, "packets_hw", " packets_hw %llu",
+				  nhe->nh_grp_stats[i].packets_hw);
 
 		if (i != nhe->nh_groups_cnt - 1)
 			print_nl();
@@ -479,6 +487,15 @@ static int ipnh_parse_nhmsg(FILE *fp, const struct nhmsg *nhm, int len,
 		nhe->nh_has_res_grp = true;
 	}
 
+	if (tb[NHA_HW_STATS_ENABLE]) {
+		nhe->nh_hw_stats_supported = true;
+		nhe->nh_hw_stats_enabled =
+			!!rta_getattr_u32(tb[NHA_HW_STATS_ENABLE]);
+	}
+
+	if (tb[NHA_HW_STATS_USED])
+		nhe->nh_hw_stats_used = !!rta_getattr_u32(tb[NHA_HW_STATS_USED]);
+
 	if (tb[NHA_GROUP_STATS]) {
 		nhe->nh_grp_stats = calloc(nhe->nh_groups_cnt,
 					   sizeof(*nhe->nh_grp_stats));
@@ -555,6 +572,15 @@ static void __print_nexthop_entry(FILE *fp, const char *jsobj,
 	if (nhe->nh_fdb)
 		print_null(PRINT_ANY, "fdb", "fdb", NULL);
 
+	if ((show_details > 0 || show_stats) && nhe->nh_hw_stats_supported) {
+		open_json_object("hw_stats");
+		print_on_off(PRINT_ANY, "enabled", "hw_stats %s ",
+			     nhe->nh_hw_stats_enabled);
+		print_on_off(PRINT_ANY, "used", "used %s ",
+			     nhe->nh_hw_stats_used);
+		close_json_object();
+	}
+
 	if (nhe->nh_grp_stats)
 		print_nh_grp_stats(nhe);
 
@@ -567,6 +593,8 @@ static __u32 ipnh_get_op_flags(void)
 
 	if (show_stats) {
 		op_flags |= NHA_OP_FLAG_DUMP_STATS;
+		if (show_stats > 1)
+			op_flags |= NHA_OP_FLAG_DUMP_HW_STATS;
 	}
 
 	return op_flags;
diff --git a/ip/nh_common.h b/ip/nh_common.h
index e2f74ec5..33b1d847 100644
--- a/ip/nh_common.h
+++ b/ip/nh_common.h
@@ -16,6 +16,7 @@ struct nha_res_grp {
 struct nh_grp_stats {
 	__u32			nh_id;
 	__u64			packets;
+	__u64			packets_hw;
 };
 
 struct nh_entry {
@@ -32,6 +33,10 @@ struct nh_entry {
 	bool			nh_blackhole;
 	bool			nh_fdb;
 
+	bool			nh_hw_stats_supported;
+	bool			nh_hw_stats_enabled;
+	bool			nh_hw_stats_used;
+
 	int			nh_gateway_len;
 	union {
 		__be32		ipv4;
-- 
2.43.0