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Date: Fri, 13 Sep 2019 10:17:36 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Ido Schimmel <idosch@...sch.org>
Cc: netdev@...r.kernel.org, davem@...emloft.net, jiri@...lanox.com,
shalomt@...lanox.com, mlxsw@...lanox.com,
Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net-next 2/2] mlxsw: spectrum_buffers: Add the ability to
query the CPU port's shared buffer
Thu, Sep 12, 2019 at 03:07:40PM CEST, idosch@...sch.org wrote:
>From: Shalom Toledo <shalomt@...lanox.com>
>
>While debugging packet loss towards the CPU, it is useful to be able to
>query the CPU port's shared buffer quotas and occupancy.
>
>Since the CPU port has no ingress buffers, all the shared buffers ingress
>information will be cleared.
>
>Signed-off-by: Shalom Toledo <shalomt@...lanox.com>
>Signed-off-by: Ido Schimmel <idosch@...lanox.com>
>---
> .../mellanox/mlxsw/spectrum_buffers.c | 51 ++++++++++++++++---
> 1 file changed, 43 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
>index 888ba4300bcc..b9eeae37a4dc 100644
>--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
>+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
>@@ -250,6 +250,10 @@ static int mlxsw_sp_sb_pm_occ_clear(struct mlxsw_sp *mlxsw_sp, u8 local_port,
> &mlxsw_sp->sb_vals->pool_dess[pool_index];
> char sbpm_pl[MLXSW_REG_SBPM_LEN];
>
>+ if (local_port == MLXSW_PORT_CPU_PORT &&
>+ des->dir == MLXSW_REG_SBXX_DIR_INGRESS)
>+ return 0;
>+
> mlxsw_reg_sbpm_pack(sbpm_pl, local_port, des->pool, des->dir,
> true, 0, 0);
> return mlxsw_reg_trans_query(mlxsw_sp->core, MLXSW_REG(sbpm), sbpm_pl,
>@@ -273,6 +277,10 @@ static int mlxsw_sp_sb_pm_occ_query(struct mlxsw_sp *mlxsw_sp, u8 local_port,
> char sbpm_pl[MLXSW_REG_SBPM_LEN];
> struct mlxsw_sp_sb_pm *pm;
>
>+ if (local_port == MLXSW_PORT_CPU_PORT &&
>+ des->dir == MLXSW_REG_SBXX_DIR_INGRESS)
>+ return 0;
>+
> pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port, pool_index);
> mlxsw_reg_sbpm_pack(sbpm_pl, local_port, des->pool, des->dir,
> false, 0, 0);
>@@ -1085,6 +1093,11 @@ int mlxsw_sp_sb_port_pool_set(struct mlxsw_core_port *mlxsw_core_port,
> u32 max_buff;
> int err;
>
>+ if (local_port == MLXSW_PORT_CPU_PORT) {
>+ NL_SET_ERR_MSG_MOD(extack, "Changing CPU port's threshold is forbidden");
>+ return -EINVAL;
>+ }
>+
> err = mlxsw_sp_sb_threshold_in(mlxsw_sp, pool_index,
> threshold, &max_buff, extack);
> if (err)
>@@ -1130,6 +1143,11 @@ int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,
> u32 max_buff;
> int err;
>
>+ if (local_port == MLXSW_PORT_CPU_PORT) {
>+ NL_SET_ERR_MSG_MOD(extack, "Changing CPU port's binding is forbidden");
I believe you need to add this check before the previous patch that
introduces the cpu port.
>+ return -EINVAL;
>+ }
>+
> if (dir != mlxsw_sp->sb_vals->pool_dess[pool_index].dir) {
> NL_SET_ERR_MSG_MOD(extack, "Binding egress TC to ingress pool and vice versa is forbidden");
> return -EINVAL;
>@@ -1187,6 +1205,11 @@ static void mlxsw_sp_sb_sr_occ_query_cb(struct mlxsw_core *mlxsw_core,
> local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
> if (!mlxsw_sp->ports[local_port])
> continue;
>+ if (local_port == MLXSW_PORT_CPU_PORT) {
>+ /* Ingress quotas are not supported for the CPU port */
>+ masked_count++;
>+ continue;
>+ }
> for (i = 0; i < MLXSW_SP_SB_ING_TC_COUNT; i++) {
> cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port, i,
> MLXSW_REG_SBXX_DIR_INGRESS);
>@@ -1222,7 +1245,7 @@ int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
> char *sbsr_pl;
> u8 masked_count;
> u8 local_port_1;
>- u8 local_port = 0;
>+ u8 local_port;
> int i;
> int err;
> int err2;
>@@ -1231,8 +1254,8 @@ int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
> if (!sbsr_pl)
> return -ENOMEM;
>
>+ local_port = MLXSW_PORT_CPU_PORT;
> next_batch:
>- local_port++;
> local_port_1 = local_port;
> masked_count = 0;
> mlxsw_reg_sbsr_pack(sbsr_pl, false);
>@@ -1243,7 +1266,11 @@ int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
> for (; local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
> if (!mlxsw_sp->ports[local_port])
> continue;
>- mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl, local_port, 1);
>+ if (local_port != MLXSW_PORT_CPU_PORT) {
>+ /* Ingress quotas are not supported for the CPU port */
>+ mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl,
>+ local_port, 1);
>+ }
> mlxsw_reg_sbsr_egress_port_mask_set(sbsr_pl, local_port, 1);
> for (i = 0; i < mlxsw_sp->sb_vals->pool_count; i++) {
> err = mlxsw_sp_sb_pm_occ_query(mlxsw_sp, local_port, i,
>@@ -1264,8 +1291,10 @@ int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
> cb_priv);
> if (err)
> goto out;
>- if (local_port < mlxsw_core_max_ports(mlxsw_core))
>+ if (local_port < mlxsw_core_max_ports(mlxsw_core)) {
>+ local_port++;
> goto next_batch;
>+ }
>
> out:
> err2 = mlxsw_reg_trans_bulk_wait(&bulk_list);
>@@ -1282,7 +1311,7 @@ int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,
> LIST_HEAD(bulk_list);
> char *sbsr_pl;
> unsigned int masked_count;
>- u8 local_port = 0;
>+ u8 local_port;
> int i;
> int err;
> int err2;
>@@ -1291,8 +1320,8 @@ int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,
> if (!sbsr_pl)
> return -ENOMEM;
>
>+ local_port = MLXSW_PORT_CPU_PORT;
> next_batch:
>- local_port++;
> masked_count = 0;
> mlxsw_reg_sbsr_pack(sbsr_pl, true);
> for (i = 0; i < MLXSW_SP_SB_ING_TC_COUNT; i++)
>@@ -1302,7 +1331,11 @@ int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,
> for (; local_port < mlxsw_core_max_ports(mlxsw_core); local_port++) {
> if (!mlxsw_sp->ports[local_port])
> continue;
>- mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl, local_port, 1);
>+ if (local_port != MLXSW_PORT_CPU_PORT) {
>+ /* Ingress quotas are not supported for the CPU port */
>+ mlxsw_reg_sbsr_ingress_port_mask_set(sbsr_pl,
>+ local_port, 1);
>+ }
> mlxsw_reg_sbsr_egress_port_mask_set(sbsr_pl, local_port, 1);
> for (i = 0; i < mlxsw_sp->sb_vals->pool_count; i++) {
> err = mlxsw_sp_sb_pm_occ_clear(mlxsw_sp, local_port, i,
>@@ -1319,8 +1352,10 @@ int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,
> &bulk_list, NULL, 0);
> if (err)
> goto out;
>- if (local_port < mlxsw_core_max_ports(mlxsw_core))
>+ if (local_port < mlxsw_core_max_ports(mlxsw_core)) {
>+ local_port++;
> goto next_batch;
>+ }
>
> out:
> err2 = mlxsw_reg_trans_bulk_wait(&bulk_list);
>--
>2.21.0
>
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