net/mlx5: fix handling of small mbuf sizes

When mbufs are smaller than MRU, multi-segment support must be enabled to
default set when not in promiscuous or allmulticast modes.

Fixes: 9964b965ad69 ("net/mlx5: re-add Rx scatter support")

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 4dc5cc3..28e93d3 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -946,6 +946,11 @@ rxq_ctrl_setup(struct rte_eth_dev *dev, struct rxq_ctrl *rxq_ctrl,
        (void)conf; /* Thresholds configuration (ignored). */
        /* Enable scattered packets support for this queue if necessary. */
        assert(mb_len >= RTE_PKTMBUF_HEADROOM);
+       /* If smaller than MRU, multi-segment support must be enabled. */
+       if (mb_len < (priv->mtu > dev->data->dev_conf.rxmode.max_rx_pkt_len ?
+                    dev->data->dev_conf.rxmode.max_rx_pkt_len :
+                    priv->mtu))
+               dev->data->dev_conf.rxmode.jumbo_frame = 1;
        if ((dev->data->dev_conf.rxmode.jumbo_frame) &&
            (dev->data->dev_conf.rxmode.max_rx_pkt_len >
             (mb_len - RTE_PKTMBUF_HEADROOM))) {