net/mlx4_en: Fix set port ratelimit for 40GE

In 40GE we can't use the default bw units for set ratelimit (100 Mbps)
since the max is 255*100 Mbps = 25 Gbps (not suited for 40GE), thus we need 1 Gbps units.
But for 10GE 1 Gbps units might be too bruit so we use the following solution.

For user set ratelimit <= 25 Gbps:
        use 100 Mbps units * user_ratelimit (* 10).

For user set ratelimit > 25 Gbps:
        use 1 Gbps units * user_ratelimit.

For user set unlimited ratelimit (0 Gbps):
        use 1 Gbps units * MAX_RATELIMIT_DEFAULT (57)

Note: any value > 58 will damage the FW ratelimit computation, so we allow
      a max and any higher value will be pulled down to 57.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index 1d8af73..13fbcd0 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -62,11 +62,6 @@
 
 #define INIT_HCA_TPT_MW_ENABLE          (1 << 7)
 
-#define MLX4_NUM_UP            8
-#define MLX4_NUM_TC            8
-#define MLX4_RATELIMIT_UNITS 3 /* 100 Mbps */
-#define MLX4_RATELIMIT_DEFAULT 0xffff
-
 struct mlx4_set_port_prio2tc_context {
        u8 prio2tc[4];
 };

diff --git a/drivers/net/ethernet/mellanox/mlx4/port.c b/drivers/net/ethernet/mellanox/mlx4/port.c
index 7ab9717..5d76a60 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/port.c
@@ -1051,14 +1051,26 @@ int mlx4_SET_PORT_SCHEDULER(struct mlx4_dev *dev, u8 port, u8 *tc_tx_bw,
 
        for (i = 0; i < MLX4_NUM_TC; i++) {
                struct mlx4_port_scheduler_tc_cfg_be *tc = &context->tc[i];
-               u16 r = ratelimit && ratelimit[i] ? ratelimit[i] :
-                       MLX4_RATELIMIT_DEFAULT;
+               u16 r;
+
+               if (ratelimit && ratelimit[i]) {
+                       if (ratelimit[i] <= MLX4_MAX_100M_UNITS_VAL) {
+                               r = ratelimit[i];
+                               tc->max_bw_units =
+                                       htons(MLX4_RATELIMIT_100M_UNITS);
+                       } else {
+                               r = ratelimit[i]/10;
+                               tc->max_bw_units =
+                                       htons(MLX4_RATELIMIT_1G_UNITS);
+                       }
+                       tc->max_bw_value = htons(r);
+               } else {
+                       tc->max_bw_value = htons(MLX4_RATELIMIT_DEFAULT);
+                       tc->max_bw_units = htons(MLX4_RATELIMIT_1G_UNITS);
+               }
 
                tc->pg = htons(pg[i]);
                tc->bw_precentage = htons(tc_tx_bw[i]);
-
-               tc->max_bw_units = htons(MLX4_RATELIMIT_UNITS);
-               tc->max_bw_value = htons(r);
        }
 
        in_mod = MLX4_SET_PORT_SCHEDULER << 8 | port;

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index b12f4bb..db0aef3 100644 (file)
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -48,6 +48,17 @@
 #define MSIX_LEGACY_SZ         4
 #define MIN_MSIX_P_PORT                5
 
+#define MLX4_NUM_UP                    8
+#define MLX4_NUM_TC                    8
+#define MLX4_MAX_100M_UNITS_VAL                255     /*
+                                                * work around: can't set values
+                                                * greater then this value when
+                                                * using 100 Mbps units.
+                                                */
+#define MLX4_RATELIMIT_100M_UNITS      3       /* 100 Mbps */
+#define MLX4_RATELIMIT_1G_UNITS                4       /* 1 Gbps */
+#define MLX4_RATELIMIT_DEFAULT         0x00ff
+
 #define MLX4_ROCE_MAX_GIDS     128
 #define MLX4_ROCE_PF_GIDS      16