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Date:   Mon,  4 Feb 2019 07:28:59 -0800
From:   Jakub Kicinski <>
        Jakub Kicinski <>
Subject: [PATCH iproute2-next v3] devlink: report cell size

Print the value of DEVLINK_ATTR_SB_POOL_CELL_SIZE, if reported.

  sb 1 pool 0 type egress size 40945664 thtype static cell_size 2048
  sb 2 pool 0 type egress size 258867200 thtype static cell_size 10240

v3: - don't double space.
v2: - fix spelling.

Signed-off-by: Jakub Kicinski <>
Reviewed-by: Quentin Monnet <>
 devlink/devlink.c     |  3 +++
 man/man8/devlink-sb.8 | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index fc4b18d1b613..40f6105af109 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -2891,6 +2891,9 @@ static void pr_out_sb_pool(struct dl *dl, struct nlattr **tb)
 	pr_out_str(dl, "thtype",
+		pr_out_uint(dl, "cell_size",
+			    mnl_attr_get_u32(tb[DEVLINK_ATTR_SB_POOL_CELL_SIZE]));
diff --git a/man/man8/devlink-sb.8 b/man/man8/devlink-sb.8
index 1882833a3fa7..91b681897d01 100644
--- a/man/man8/devlink-sb.8
+++ b/man/man8/devlink-sb.8
@@ -128,6 +128,16 @@ Behaviour of this argument it the same for every command.
 - specifies the devlink device to show pools.
 If this argument is omitted all pools of all devices are listed.
+Display available pools listing their
+.B type, size, thtype
+.B cell_size. cell_size
+is the allocation granularity of memory within the shared buffer. Drivers
+may round up, round down or reject
+.B size
+passed to the set command if it is not multiple of
+.B cell_size.
 .SS devlink sb pool set - set attributes of pool

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