> -----Original Message-----
> From: Alexander Kozyrev <akozy...@mellanox.com>
> Sent: Wednesday, April 1, 2020 0:53
> To: dev@dpdk.org
> Cc: Raslan Darawsheh <rasl...@mellanox.com>; Matan Azrad
> <ma...@mellanox.com>; Slava Ovsiienko <viachesl...@mellanox.com>;
> ferruh.yi...@intel.com; Thomas Monjalon <tho...@monjalon.net>
> Subject: [PATCH 1/4] net/mlx5: add a devarg to specify MPRQ stride size
> 
> Define a device parameter to configure log 2 of a stride size for MPRQ
> - mprq_log_stride_size. User is able to specify a stride size in a range 
> allowed
> by an underlying hardware. The default stride size is defined as
> 2048 bytes to encompass most commonly used packet sizes in the Internet
> (MTU 1518 and less) and will be used in case a maximum configured packet
> size cannot fit into the largest possible stride size. Otherwise a stride 
> size is
> set to a large enough value to encompass a whole packet.
> 
> Signed-off-by: Alexander Kozyrev <akozy...@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viachesl...@mellanox.com>

> ---
>  drivers/net/mlx5/mlx5.c      | 34 +++++++++++++++++++++++++++-------
>  drivers/net/mlx5/mlx5.h      |  1 +
>  drivers/net/mlx5/mlx5_defs.h |  3 +++
>  drivers/net/mlx5/mlx5_rxq.c  | 22 +++++++++++++---------
>  4 files changed, 44 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c index
> 6a11b14..a2ba6d3 100644
> --- a/drivers/net/mlx5/mlx5.c
> +++ b/drivers/net/mlx5/mlx5.c
> @@ -63,6 +63,9 @@
>  /* Device parameter to configure log 2 of the number of strides for MPRQ. */
> #define MLX5_RX_MPRQ_LOG_STRIDE_NUM "mprq_log_stride_num"
> 
> +/* Device parameter to configure log 2 of the stride size for MPRQ. */
> +#define MLX5_RX_MPRQ_LOG_STRIDE_SIZE "mprq_log_stride_size"
> +
>  /* Device parameter to limit the size of memcpy'd packet for MPRQ. */
> #define MLX5_RX_MPRQ_MAX_MEMCPY_LEN "mprq_max_memcpy_len"
> 
> @@ -1531,6 +1534,8 @@ struct mlx5_flow_id_pool *
>               config->mprq.enabled = !!tmp;
>       } else if (strcmp(MLX5_RX_MPRQ_LOG_STRIDE_NUM, key) == 0) {
>               config->mprq.stride_num_n = tmp;
> +     } else if (strcmp(MLX5_RX_MPRQ_LOG_STRIDE_SIZE, key) == 0) {
> +             config->mprq.stride_size_n = tmp;
>       } else if (strcmp(MLX5_RX_MPRQ_MAX_MEMCPY_LEN, key) == 0) {
>               config->mprq.max_memcpy_len = tmp;
>       } else if (strcmp(MLX5_RXQS_MIN_MPRQ, key) == 0) { @@ -1627,6
> +1632,7 @@ struct mlx5_flow_id_pool *
>               MLX5_RXQ_PKT_PAD_EN,
>               MLX5_RX_MPRQ_EN,
>               MLX5_RX_MPRQ_LOG_STRIDE_NUM,
> +             MLX5_RX_MPRQ_LOG_STRIDE_SIZE,
>               MLX5_RX_MPRQ_MAX_MEMCPY_LEN,
>               MLX5_RXQS_MIN_MPRQ,
>               MLX5_TXQ_INLINE,
> @@ -2302,8 +2308,6 @@ struct mlx5_flow_id_pool *
>                       mprq_caps.min_single_wqe_log_num_of_strides;
>               mprq_max_stride_num_n =
>                       mprq_caps.max_single_wqe_log_num_of_strides;
> -             config.mprq.stride_num_n =
> RTE_MAX(MLX5_MPRQ_STRIDE_NUM_N,
> -                                                mprq_min_stride_num_n);
>       }
>  #endif
>       if (RTE_CACHE_LINE_SIZE == 128 &&
> @@ -2617,17 +2621,32 @@ struct mlx5_flow_id_pool *  #endif
>       }
>       if (config.mprq.enabled && mprq) {
> -             if (config.mprq.stride_num_n > mprq_max_stride_num_n ||
> -                 config.mprq.stride_num_n < mprq_min_stride_num_n) {
> +             if (config.mprq.stride_num_n &&
> +                 (config.mprq.stride_num_n > mprq_max_stride_num_n ||
> +                  config.mprq.stride_num_n < mprq_min_stride_num_n)) {
>                       config.mprq.stride_num_n =
> -                             RTE_MAX(MLX5_MPRQ_STRIDE_NUM_N,
> -                                     mprq_min_stride_num_n);
> +
>       RTE_MIN(RTE_MAX(MLX5_MPRQ_STRIDE_NUM_N,
> +                                             mprq_min_stride_num_n),
> +                                     mprq_max_stride_num_n);
>                       DRV_LOG(WARNING,
>                               "the number of strides"
>                               " for Multi-Packet RQ is out of range,"
>                               " setting default value (%u)",
>                               1 << config.mprq.stride_num_n);
>               }
> +             if (config.mprq.stride_size_n &&
> +                 (config.mprq.stride_size_n > mprq_max_stride_size_n ||
> +                  config.mprq.stride_size_n < mprq_min_stride_size_n)) {
> +                     config.mprq.stride_size_n =
> +
>       RTE_MIN(RTE_MAX(MLX5_MPRQ_STRIDE_SIZE_N,
> +                                             mprq_min_stride_size_n),
> +                                     mprq_max_stride_size_n);
> +                     DRV_LOG(WARNING,
> +                             "the size of a stride"
> +                             " for Multi-Packet RQ is out of range,"
> +                             " setting default value (%u)",
> +                             1 << config.mprq.stride_size_n);
> +             }
>               config.mprq.min_stride_size_n = mprq_min_stride_size_n;
>               config.mprq.max_stride_size_n = mprq_max_stride_size_n;
>       } else if (config.mprq.enabled && !mprq) { @@ -3361,7 +3380,8 @@
> struct mlx5_flow_id_pool *
>               .mr_ext_memseg_en = 1,
>               .mprq = {
>                       .enabled = 0, /* Disabled by default. */
> -                     .stride_num_n = MLX5_MPRQ_STRIDE_NUM_N,
> +                     .stride_num_n = 0,
> +                     .stride_size_n = 0,
>                       .max_memcpy_len =
> MLX5_MPRQ_MEMCPY_DEFAULT_LEN,
>                       .min_rxqs_num = MLX5_MPRQ_MIN_RXQS,
>               },
> diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h index
> 62b0810..c8e2454 100644
> --- a/drivers/net/mlx5/mlx5.h
> +++ b/drivers/net/mlx5/mlx5.h
> @@ -176,6 +176,7 @@ struct mlx5_dev_config {
>       struct {
>               unsigned int enabled:1; /* Whether MPRQ is enabled. */
>               unsigned int stride_num_n; /* Number of strides. */
> +             unsigned int stride_size_n; /* Size of a stride. */
>               unsigned int min_stride_size_n; /* Min size of a stride. */
>               unsigned int max_stride_size_n; /* Max size of a stride. */
>               unsigned int max_memcpy_len;
> diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h
> index 19e8253..260f584 100644
> --- a/drivers/net/mlx5/mlx5_defs.h
> +++ b/drivers/net/mlx5/mlx5_defs.h
> @@ -143,6 +143,9 @@
>  /* Log 2 of the default number of strides per WQE for Multi-Packet RQ. */
> #define MLX5_MPRQ_STRIDE_NUM_N 6U
> 
> +/* Log 2 of the default size of a stride per WQE for Multi-Packet RQ.
> +*/ #define MLX5_MPRQ_STRIDE_SIZE_N 11U
> +
>  /* Two-byte shift is disabled for Multi-Packet RQ. */  #define
> MLX5_MPRQ_TWO_BYTE_SHIFT 0
> 
> diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c index
> 0a95e3c..85fcfe6 100644
> --- a/drivers/net/mlx5/mlx5_rxq.c
> +++ b/drivers/net/mlx5/mlx5_rxq.c
> @@ -1856,25 +1856,26 @@ struct mlx5_rxq_ctrl *
>               strd_headroom_en = 1;
>               mprq_stride_size = non_scatter_min_mbuf_size;
>       }
> +     if (!config->mprq.stride_num_n)
> +             config->mprq.stride_num_n = MLX5_MPRQ_STRIDE_NUM_N;
> +     if (!config->mprq.stride_size_n)
> +             config->mprq.stride_size_n = (mprq_stride_size <=
> +                             (1U << config->mprq.max_stride_size_n)) ?
> +                     log2above(mprq_stride_size) :
> MLX5_MPRQ_STRIDE_SIZE_N;
>       /*
>        * This Rx queue can be configured as a Multi-Packet RQ if all of the
>        * following conditions are met:
>        *  - MPRQ is enabled.
>        *  - The number of descs is more than the number of strides.
> -      *  - max_rx_pkt_len plus overhead is less than the max size of a
> -      *    stride.
>        *  Otherwise, enable Rx scatter if necessary.
>        */
> -     if (mprq_en &&
> -         desc > (1U << config->mprq.stride_num_n) &&
> -         mprq_stride_size <= (1U << config->mprq.max_stride_size_n)) {
> +     if (mprq_en && desc > (1U << config->mprq.stride_num_n)) {
>               /* TODO: Rx scatter isn't supported yet. */
>               tmpl->rxq.sges_n = 0;
>               /* Trim the number of descs needed. */
>               desc >>= config->mprq.stride_num_n;
>               tmpl->rxq.strd_num_n = config->mprq.stride_num_n;
> -             tmpl->rxq.strd_sz_n = RTE_MAX(log2above(mprq_stride_size),
> -                                           config->mprq.min_stride_size_n);
> +             tmpl->rxq.strd_sz_n = config->mprq.stride_size_n;
>               tmpl->rxq.strd_shift_en = MLX5_MPRQ_TWO_BYTE_SHIFT;
>               tmpl->rxq.strd_headroom_en = strd_headroom_en;
>               tmpl->rxq.mprq_max_memcpy_len =
> RTE_MIN(first_mb_free_size, @@ -1924,9 +1925,12 @@ struct mlx5_rxq_ctrl *
>               DRV_LOG(WARNING,
>                       "port %u MPRQ is requested but cannot be enabled"
>                       " (requested: desc = %u, stride_sz = %u,"
> -                     " supported: min_stride_num = %u, max_stride_sz =
> %u).",
> -                     dev->data->port_id, desc, mprq_stride_size,
> +                     " supported: min_stride_num = %u, min_stride_sz =
> %u,"
> +                     "max_stride_sz = %u).",
> +                     dev->data->port_id, desc,
> +                     (1 << config->mprq.stride_size_n),
>                       (1 << config->mprq.stride_num_n),
> +                     (1 << config->mprq.min_stride_size_n),
>                       (1 << config->mprq.max_stride_size_n));
>       DRV_LOG(DEBUG, "port %u maximum number of segments per
> packet: %u",
>               dev->data->port_id, 1 << tmpl->rxq.sges_n);
> --
> 1.8.3.1

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