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Date:   Mon, 27 Apr 2020 10:51:55 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH iproute2] tc: fq_codel: add drop_batch parameter

Commit 9d18562a2278 ("fq_codel: add batch ability to fq_codel_drop()")
added the new TCA_FQ_CODEL_DROP_BATCH_SIZE parameter, set by default to 64.

Add to tc command the ability to get/set the drop_batch

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 tc/q_fq_codel.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/tc/q_fq_codel.c b/tc/q_fq_codel.c
index 1c6cf1e0de9ef6aa2400f36008cbc830c37352c0..1a51302e0e2b332a4496965dfeaf520bc843f8ad 100644
--- a/tc/q_fq_codel.c
+++ b/tc/q_fq_codel.c
@@ -54,12 +54,14 @@ static void explain(void)
 					"[ memory_limit BYTES ]\n"
 					"[ target TIME ] [ interval TIME ]\n"
 					"[ quantum BYTES ] [ [no]ecn ]\n"
-					"[ ce_threshold TIME ]\n");
+					"[ ce_threshold TIME ]\n"
+					"[ drop_batch SIZE ]\n");
 }
 
 static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 			      struct nlmsghdr *n, const char *dev)
 {
+	unsigned int drop_batch = 0;
 	unsigned int limit = 0;
 	unsigned int flows = 0;
 	unsigned int target = 0;
@@ -89,6 +91,12 @@ static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 				fprintf(stderr, "Illegal \"quantum\"\n");
 				return -1;
 			}
+		} else if (strcmp(*argv, "drop_batch") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&drop_batch, *argv, 0)) {
+				fprintf(stderr, "Illegal \"drop_batch\"\n");
+				return -1;
+			}
 		} else if (strcmp(*argv, "target") == 0) {
 			NEXT_ARG();
 			if (get_time(&target, *argv)) {
@@ -147,6 +155,8 @@ static int fq_codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 	if (memory != ~0U)
 		addattr_l(n, 1024, TCA_FQ_CODEL_MEMORY_LIMIT,
 			  &memory, sizeof(memory));
+	if (drop_batch)
+		addattr_l(n, 1024, TCA_FQ_CODEL_DROP_BATCH_SIZE, &drop_batch, sizeof(drop_batch));
 
 	addattr_nest_end(n, tail);
 	return 0;
@@ -163,6 +173,7 @@ static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt
 	unsigned int quantum;
 	unsigned int ce_threshold;
 	unsigned int memory_limit;
+	unsigned int drop_batch;
 
 	SPRINT_BUF(b1);
 
@@ -220,6 +231,12 @@ static int fq_codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt
 		if (ecn)
 			print_bool(PRINT_ANY, "ecn", "ecn ", true);
 	}
+	if (tb[TCA_FQ_CODEL_DROP_BATCH_SIZE] &&
+	    RTA_PAYLOAD(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]) >= sizeof(__u32)) {
+		drop_batch = rta_getattr_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]);
+		if (drop_batch)
+			print_uint(PRINT_ANY, "drop_batch", "drop_batch %u ", drop_batch);
+	}
 
 	return 0;
 }
-- 
2.26.2.303.gf8c07b1a785-goog

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