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HE1PR05MB3210; 6:7WPcRAMxmSTKBqzi7JPnCRG83bNkCcvIR62o1eOZ1fz9wxHzs+15seSnKOFoM1HrbzQk+BD6MN323fUgZKGjzwG/awXDwxKmWKtCzTQydTYqm4zfCI8V+RypXe437O+cB7MAVP4U9g6y3MDo+In5f03W0hnnVT+LTsNNOu0TMzQu7p1OjXiPY3Qo49Nw8kyvOB3BUuySRgrfv1ckzR35D20wdNTFkBG2eoNUNoNIsZGEjU8nEtKlJID6h4rRHbt5mXkMCyCUrKcDaTgpV88sjgFlICPt1cvUTHVR2YAhg03MQkhSR2fL93cxyEKMbQRmr1XPEjT5DV9Xr+0KFtoetmbhkvvZPNvWIyvhksKHZ7s=; 5:zpnEKP9+IXLr4Q0FPPP7XObUrWPZZQxP+qe+Mp9rB2RG+eWkFVUQVwzd0GE3Bf6L9anjNV35W3kSP6XWXBW61fcU8DHG1F9vTMdHXZSvleN/yEMljFTLrN7cyM5DV23SzyyEdUEK+uocEq+7N+iRUJLlOe8FCCc3RayQDPEQ8OI=; 24:WxHde6SBtXQyiBhukEJSdeERQIyin/tydbVoJ1Y8iAxvpC/8PBDD6/zjC2Cw9rFLU/3CzgbTc07nHP24fMYW3wLavZu/oiI3+T53eH0Wg14=; 7:AlR0wOJQ3W0hOyElwjZWcbb5RPHZMIME5JXWAmPldqX5dOd7HLeEcP+1gyibW5p/i1sr6YTf6MpCJRZTTFZKUW2C2C7WX7yE+R9pddZ+Jz81sBSL1arRdl4KTsozGWHDxibgwZwm438k1HoJf2tsKih5xVbLViAGtH+A5n5syMMSy00taWjIeRd/NgP0/4xWyqMCzGtt/H1BjT038r0K37bkTpHJyDzVf72HVOnTEe1V8RpWHRn0ZZwoBpZ4O6ty SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jan 2018 16:12:16.9618 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5cc36990-9b5a-4c01-c417-08d5538ded06 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR05MB3210 Subject: [dpdk-dev] [PATCH] net/mlx4: verify Tx max sges X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Jan 2018 16:12:20 -0000 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 --- drivers/net/mlx4/mlx4.c | 1 + drivers/net/mlx4/mlx4_prm.h | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c index 4bc4a6f..61c5bf4 100644 --- a/drivers/net/mlx4/mlx4.c +++ b/drivers/net/mlx4/mlx4.c @@ -505,6 +505,7 @@ struct mlx4_conf { 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; diff --git a/drivers/net/mlx4/mlx4_prm.h b/drivers/net/mlx4/mlx4_prm.h index 217ea50..b382d59 100644 --- a/drivers/net/mlx4/mlx4_prm.h +++ b/drivers/net/mlx4/mlx4_prm.h @@ -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. */ -- 1.8.3.1