Patch "mlxsw: spectrum_buffers: Set a minimum quota for CPU port traffic" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

mlxsw: spectrum_buffers: Set a minimum quota for CPU port traffic

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mlxsw-spectrum_buffers-set-a-minimum-quota-for-cpu-port-traffic.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ido Schimmel <[email protected]>
Date: Thu, 15 Mar 2018 14:49:56 +0200
Subject: mlxsw: spectrum_buffers: Set a minimum quota for CPU port traffic

From: Ido Schimmel <[email protected]>

[ Upstream commit bcdd5de80a2275f7879dc278bfc747f1caf94442 ]

In commit 9ffcc3725f09 ("mlxsw: spectrum: Allow packets to be trapped from any PG") I fixed a problem where packets could not be trapped to the CPU due to exceeded shared buffer quotas. The mentioned commit explains the problem in detail.

The problem was fixed by assigning a minimum quota for the CPU port and the traffic class used for scheduling traffic to the CPU.

However, commit 117b0dad2d54 ("mlxsw: Create a different trap group list for each device") assigned different traffic classes to different packet types and rendered the fix useless.

Fix the problem by assigning a minimum quota for the CPU port and all the traffic classes that are currently in use.

---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

@@ -385,13 +385,13 @@ static const struct mlxsw_sp_sb_cm mlxsw
 
 static const struct mlxsw_sp_sb_cm mlxsw_sp_cpu_port_sb_cms[] = {
 	MLXSW_SP_CPU_PORT_SB_CM,
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
 	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_SB_CM(10000, 0, 0),
+	MLXSW_SP_SB_CM(MLXSW_PORT_MAX_MTU, 0, 0),
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/mlxsw-spectrum_buffers-set-a-minimum-quota-for-cpu-port-traffic.patch