netdev - [PATCH iproute2/net-next v2] tc_util: Add support for showing TCA_STATS_BASIC

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Date:   Fri, 10 Aug 2018 07:59:30 -0400
From:   Eelco Chaudron <echaudro@...hat.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, stephen@...workplumber.org
Subject: [PATCH iproute2/net-next v2] tc_util: Add support for showing TCA_STATS_BASIC_HW statistics

Add support for showing hardware specific counters to easy
troubleshooting hardware offload.

$ tc -s filter show dev enp3s0np0 parent ffff:
filter protocol ip pref 1 flower chain 0
filter protocol ip pref 1 flower chain 0 handle 0x1
  eth_type ipv4
  dst_ip 2.0.0.0
  src_ip 1.0.0.0
  ip_flags nofrag
  in_hw
        action order 1: mirred (Egress Redirect to device eth1) stolen
        index 1 ref 1 bind 1 installed 0 sec used 0 sec
        Action statistics:
        Sent 534884742 bytes 8915697 pkt (dropped 0, overlimits 0 requeues 0)
        Sent software 187542 bytes 4077 pkt
        Sent hardware 534697200 bytes 8911620 pkt
        backlog 0b 0p requeues 0
        cookie 89173e6a44447001becfd486bda17e29


Signed-off-by: Eelco Chaudron <echaudro@...hat.com>
---
v2:
 * Removed unnecessary initialization
 * Made not displaying of missing TCA_STATS_BASIC_HW more obvious
 * Use _SL_ macro for single line output

 include/uapi/linux/gen_stats.h |    1 +
 tc/tc_util.c                   |   41 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/include/uapi/linux/gen_stats.h b/include/uapi/linux/gen_stats.h
index 24a861c..065408e 100644
--- a/include/uapi/linux/gen_stats.h
+++ b/include/uapi/linux/gen_stats.h
@@ -12,6 +12,7 @@ enum {
 	TCA_STATS_APP,
 	TCA_STATS_RATE_EST64,
 	TCA_STATS_PAD,
+	TCA_STATS_BASIC_HW,
 	__TCA_STATS_MAX,
 };
 #define TCA_STATS_MAX (__TCA_STATS_MAX - 1)
diff --git a/tc/tc_util.c b/tc/tc_util.c
index d757852..5a1bbf2 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -800,6 +800,44 @@ void print_tm(FILE *f, const struct tcf_t *tm)
 	}
 }
 
+static void print_tcstats_basic_hw(struct rtattr **tbs, char *prefix)
+{
+	struct gnet_stats_basic bs_hw;
+
+	if (!tbs[TCA_STATS_BASIC_HW])
+		return;
+
+	memcpy(&bs_hw, RTA_DATA(tbs[TCA_STATS_BASIC_HW]),
+	       MIN(RTA_PAYLOAD(tbs[TCA_STATS_BASIC_HW]), sizeof(bs_hw)));
+
+	if (bs_hw.bytes == 0 && bs_hw.packets == 0)
+		return;
+
+	if (tbs[TCA_STATS_BASIC]) {
+		struct gnet_stats_basic bs;
+
+		memcpy(&bs, RTA_DATA(tbs[TCA_STATS_BASIC]),
+		       MIN(RTA_PAYLOAD(tbs[TCA_STATS_BASIC]),
+			   sizeof(bs)));
+
+		if (bs.bytes >= bs_hw.bytes && bs.packets >= bs_hw.packets) {
+			print_string(PRINT_FP, NULL, "%s", _SL_);
+			print_string(PRINT_FP, NULL, "%s", prefix);
+			print_lluint(PRINT_ANY, "sw_bytes",
+				     "Sent software %llu bytes",
+				     bs.bytes - bs_hw.bytes);
+			print_uint(PRINT_ANY, "sw_packets", " %u pkt",
+				   bs.packets - bs_hw.packets);
+		}
+	}
+
+	print_string(PRINT_FP, NULL, "%s", _SL_);
+	print_string(PRINT_FP, NULL, "%s", prefix);
+	print_lluint(PRINT_ANY, "hw_bytes", "Sent hardware %llu bytes",
+		     bs_hw.bytes);
+	print_uint(PRINT_ANY, "hw_packets", " %u pkt", bs_hw.packets);
+}
+
 void print_tcstats2_attr(FILE *fp, struct rtattr *rta, char *prefix, struct rtattr **xstats)
 {
 	SPRINT_BUF(b1);
@@ -826,6 +864,9 @@ void print_tcstats2_attr(FILE *fp, struct rtattr *rta, char *prefix, struct rtat
 		print_uint(PRINT_ANY, "requeues", " requeues %u) ", q.requeues);
 	}
 
+	if (tbs[TCA_STATS_BASIC_HW])
+		print_tcstats_basic_hw(tbs, prefix);
+
 	if (tbs[TCA_STATS_RATE_EST64]) {
 		struct gnet_stats_rate_est64 re = {0};