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Message-ID: <20190217071809.19295-1-idosch@mellanox.com> Date: Sun, 17 Feb 2019 07:18:41 +0000 From: Ido Schimmel <idosch@...lanox.com> To: "netdev@...r.kernel.org" <netdev@...r.kernel.org> CC: "davem@...emloft.net" <davem@...emloft.net>, Jiri Pirko <jiri@...lanox.com>, Petr Machata <petrm@...lanox.com>, mlxsw <mlxsw@...lanox.com>, Ido Schimmel <idosch@...lanox.com> Subject: [PATCH net] mlxsw: __mlxsw_sp_port_headroom_set(): Fix a use of local variable From: Petr Machata <petrm@...lanox.com> The function-local variable "delay" enters the loop interpreted as delay in bits. However, inside the loop it gets overwritten by the result of mlxsw_sp_pg_buf_delay_get(), and thus leaves the loop as quantity in cells. Thus on second and further loop iterations, the headroom for a given priority is configured with a wrong size. Fix by introducing a loop-local variable, delay_cells. Rename thres to thres_cells for consistency. Fixes: f417f04da589 ("mlxsw: spectrum: Refactor port buffer configuration") Signed-off-by: Petr Machata <petrm@...lanox.com> Acked-by: Jiri Pirko <jiri@...lanox.com> Signed-off-by: Ido Schimmel <idosch@...lanox.com> --- drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c index 32519c93df17..b65e274b02e9 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c @@ -862,8 +862,9 @@ int __mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port, int mtu, for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { bool configure = false; bool pfc = false; + u16 thres_cells; + u16 delay_cells; bool lossy; - u16 thres; for (j = 0; j < IEEE_8021QAZ_MAX_TCS; j++) { if (prio_tc[j] == i) { @@ -877,10 +878,11 @@ int __mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port, int mtu, continue; lossy = !(pfc || pause_en); - thres = mlxsw_sp_pg_buf_threshold_get(mlxsw_sp, mtu); - delay = mlxsw_sp_pg_buf_delay_get(mlxsw_sp, mtu, delay, pfc, - pause_en); - mlxsw_sp_pg_buf_pack(pbmc_pl, i, thres + delay, thres, lossy); + thres_cells = mlxsw_sp_pg_buf_threshold_get(mlxsw_sp, mtu); + delay_cells = mlxsw_sp_pg_buf_delay_get(mlxsw_sp, mtu, delay, + pfc, pause_en); + mlxsw_sp_pg_buf_pack(pbmc_pl, i, thres_cells + delay_cells, + thres_cells, lossy); } return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl); -- 2.20.1
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