netdev - [PATCH iproute2-next] tc: flower: add support for verbose logging

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Date:   Sun, 13 May 2018 17:44:28 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kubakici@...pl>, David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Alexander Aring <aring@...atatu.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>, marcelo.leitner@...il.com
Subject: [PATCH iproute2-next] tc: flower: add support for verbose logging

From: Marcelo Ricardo Leitner <mleitner@...hat.com>

Currently there is no way to log offloading errors if the rule is not
explicitly marked as skip_sw, making it hard for other applications such
as Open vSwitch to log why a given could not be offloaded.

This patch adds support for signaling the kernel that more verbose
logging is wanted, which now will include such messages.

Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
---
 include/uapi/linux/pkt_cls.h | 1 +
 man/man8/tc-flower.8         | 7 +++++++
 tc/f_flower.c                | 4 +++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index be05e66c167b12a70db409242519a9b1958b1000..84e4c1d0f874afec5891fcf95def286c121f71ed 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -129,6 +129,7 @@ enum {
 #define TCA_CLS_FLAGS_SKIP_SW	(1 << 1) /* don't use filter in SW */
 #define TCA_CLS_FLAGS_IN_HW	(1 << 2) /* filter is offloaded to HW */
 #define TCA_CLS_FLAGS_NOT_IN_HW (1 << 3) /* filter isn't offloaded to HW */
+#define TCA_CLS_FLAGS_VERBOSE	(1 << 4) /* verbose logging */
 
 /* U32 filters */
 
diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index a561443b9978bee55142f7dfed6b46106f7b9baf..4f3714b79544b33f198d711fa9006806685d43a8 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -22,6 +22,8 @@ flower \- flow based traffic control filter
 .IR MATCH " := { "
 .B indev
 .IR ifname " | "
+.BR verbose
+.RI " | "
 .BR skip_sw " | " skip_hw
 .RI " | { "
 .BR dst_mac " | " src_mac " } "
@@ -100,6 +102,11 @@ is the name of an interface which must exist at the time of
 .B tc
 invocation.
 .TP
+.BI verbose
+Enable verbose logging, including offloading errors when not using
+.B skip_sw
+flag.
+.TP
 .BI skip_sw
 Do not process filter by software. If hardware has no offload support for this
 filter, or TC offload is not enabled for the interface, operation will fail.
diff --git a/tc/f_flower.c b/tc/f_flower.c
index ba8eb66cdd111adf4f68f041fb6c4acc48fd1a90..c710765179fb08ac94e04ec664fac0d30cf04931 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -41,7 +41,7 @@ enum flower_icmp_field {
 static void explain(void)
 {
 	fprintf(stderr,
-		"Usage: ... flower [ MATCH-LIST ]\n"
+		"Usage: ... flower [ MATCH-LIST ] [ verbose ]\n"
 		"                  [ skip_sw | skip_hw ]\n"
 		"                  [ action ACTION-SPEC ] [ classid CLASSID ]\n"
 		"\n"
@@ -648,6 +648,8 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
 				fprintf(stderr, "Illegal \"ip_flags\"\n");
 				return -1;
 			}
+		} else if (matches(*argv, "verbose") == 0) {
+			flags |= TCA_CLS_FLAGS_VERBOSE;
 		} else if (matches(*argv, "skip_hw") == 0) {
 			flags |= TCA_CLS_FLAGS_SKIP_HW;
 		} else if (matches(*argv, "skip_sw") == 0) {
-- 
2.14.3