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net/mlx4: verify Tx max sges

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Max number of Tx scatter-gather entries is a property of the device
and is queried at init. This value was not changed in a while and
most probably will not be changed in the future, Therefore and
in order to enhance Tx performance, the Tx max-sge value is hardcoded
in mlx4 PRM code.
This patch adds a verification that the above assumption still holds
and that the hardcoded value is still supported by the mlx4 hardware.

Signed-off-by: Moti Haimovsky <motih@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
This commit is contained in:
Moti Haimovsky 2018-01-04 18:12:03 +02:00 committed by Ferruh Yigit
parent 5dba3b9c4c
commit 2ebf5f7e92
2 changed files with 5 additions and 1 deletions
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1
drivers/net/mlx4/mlx4.c
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@ -505,6 +505,7 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
rte_errno = ENODEV;
goto error;
}
assert(device_attr.max_sge >= MLX4_MAX_SGE);
for (i = 0; i < device_attr.phys_port_cnt; i++) {
uint32_t port = i + 1; /* ports are indexed from one */
struct ibv_context *ctx = NULL;

5
drivers/net/mlx4/mlx4_prm.h
View File

@ -53,7 +53,10 @@
#define MLX4_TXBB_SIZE (1 << MLX4_TXBB_SHIFT)
/* Typical TSO descriptor with 16 gather entries is 352 bytes. */
#define MLX4_MAX_WQE_SIZE 512
#define MLX4_MAX_SGE 32
#define MLX4_MAX_WQE_SIZE \
(MLX4_MAX_SGE * sizeof(struct mlx4_wqe_data_seg) + \
sizeof(struct mlx4_wqe_ctrl_seg))
#define MLX4_SEG_SHIFT 4
/* Send queue stamping/invalidating information. */