redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

net/mlx4_en: Fix set port ratelimit for 40GE

Browse source 
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>
This commit is contained in:
Eugenia Emantayev 2014-07-08 11:25:19 +03:00 committed by David S. Miller
parent 9274f9f895
commit 523ece889e
3 changed files with 28 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/net/ethernet/mellanox/mlx4/mlx4.h
View file

@ -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];
};

22
drivers/net/ethernet/mellanox/mlx4/port.c
View file

@ -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;

11
include/linux/mlx4/device.h
View file

@ -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