net/mlx4: add RSS support outside flow API

[dpdk.git] / drivers / net / mlx4 / mlx4_flow.c

diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index 4c498f0..5c4bf8e 100644 (file)
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -1256,12 +1256,21 @@ mlx4_flow_internal(struct priv *priv, struct rte_flow_error *error)
                        .type = RTE_FLOW_ITEM_TYPE_END,
                },
        };
+       /*
+        * Round number of queues down to their previous power of 2 to
+        * comply with RSS context limitations. Extra queues silently do not
+        * get RSS by default.
+        */
+       uint32_t queues =
+               rte_align32pow2(priv->dev->data->nb_rx_queues + 1) >> 1;
+       alignas(struct rte_flow_action_rss) uint8_t rss_conf_data
+               [offsetof(struct rte_flow_action_rss, queue) +
+                sizeof(((struct rte_flow_action_rss *)0)->queue[0]) * queues];
+       struct rte_flow_action_rss *rss_conf = (void *)rss_conf_data;
        struct rte_flow_action actions[] = {
                {
-                       .type = RTE_FLOW_ACTION_TYPE_QUEUE,
-                       .conf = &(struct rte_flow_action_queue){
-                               .index = 0,
-                       },
+                       .type = RTE_FLOW_ACTION_TYPE_RSS,
+                       .conf = rss_conf,
                },
                {
                        .type = RTE_FLOW_ACTION_TYPE_END,
@@ -1281,6 +1290,13 @@ mlx4_flow_internal(struct priv *priv, struct rte_flow_error *error)
        unsigned int i;
        int err = 0;
 
+       /* Prepare default RSS configuration. */
+       *rss_conf = (struct rte_flow_action_rss){
+               .rss_conf = NULL, /* Rely on default fallback settings. */
+               .num = queues,
+       };
+       for (i = 0; i != queues; ++i)
+               rss_conf->queue[i] = i;
        /*
         * Set up VLAN item if filtering is enabled and at least one VLAN
         * filter is configured.