net/mlx5: report max number of mbuf segments

This patch fills the tx_desc_lim.nb_seg_max and
tx_desc_lim.nb_mtu_seg_max fields of rte_eth_dev_info
structure to report thee maximal number of packet
segments, requested inline data configuration is
taken into account in conservative way.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 738d540..6c9bcf1 100644 (file)
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -591,6 +591,42 @@ mlx5_set_default_params(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
        }
 }
 
+/**
+ * Sets tx mbuf limiting parameters.
+ *
+ * @param dev
+ *   Pointer to Ethernet device.
+ * @param[out] info
+ *   Info structure output buffer.
+ */
+static void
+mlx5_set_txlimit_params(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
+{
+       struct mlx5_priv *priv = dev->data->dev_private;
+       struct mlx5_dev_config *config = &priv->config;
+       unsigned int inlen;
+       uint16_t nb_max;
+
+       inlen = (config->txq_inline_max == MLX5_ARG_UNSET) ?
+               MLX5_SEND_DEF_INLINE_LEN :
+               (unsigned int)config->txq_inline_max;
+       assert(config->txq_inline_min >= 0);
+       inlen = RTE_MAX(inlen, (unsigned int)config->txq_inline_min);
+       inlen = RTE_MIN(inlen, MLX5_WQE_SIZE_MAX +
+                              MLX5_ESEG_MIN_INLINE_SIZE -
+                              MLX5_WQE_CSEG_SIZE -
+                              MLX5_WQE_ESEG_SIZE -
+                              MLX5_WQE_DSEG_SIZE * 2);
+       nb_max = (MLX5_WQE_SIZE_MAX +
+                 MLX5_ESEG_MIN_INLINE_SIZE -
+                 MLX5_WQE_CSEG_SIZE -
+                 MLX5_WQE_ESEG_SIZE -
+                 MLX5_WQE_DSEG_SIZE -
+                 inlen) / MLX5_WSEG_SIZE;
+       info->tx_desc_lim.nb_seg_max = nb_max;
+       info->tx_desc_lim.nb_mtu_seg_max = nb_max;
+}
+
 /**
  * DPDK callback to get information about the device.
  *
@@ -634,6 +670,7 @@ mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
        info->speed_capa = priv->link_speed_capa;
        info->flow_type_rss_offloads = ~MLX5_RSS_HF_MASK;
        mlx5_set_default_params(dev, info);
+       mlx5_set_txlimit_params(dev, info);
        info->switch_info.name = dev->data->name;
        info->switch_info.domain_id = priv->domain_id;
        info->switch_info.port_id = priv->representor_id;