For some unknown reason, priorities do not have any effect on flow rules
that happen to match UDP destination ports. Those are always matched first
regardless.
This patch is a workaround that enforces this limitation at the PMD level;
such flow rules can only be created at the highest priority level for
correctness.
Fixes: a5171594fc3b ("net/mlx4: expose support for flow rule priorities")
Cc: sta...@dpdk.org
Signed-off-by: Adrien Mazarguil <adrien.mazarg...@6wind.com>
---
drivers/net/mlx4/mlx4_flow.c | 9 +++++++++
drivers/net/mlx4/mlx4_flow.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index bebad074e..3f754b480 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -357,6 +357,9 @@ mlx4_flow_merge_ipv4(struct rte_flow *flow,
* Additional mlx4-specific constraints on supported fields:
*
* - No support for partial masks.
+ * - Due to HW/FW limitation, flow rule priority is not taken into account
+ * when matching UDP destination ports, doing is therefore only supported
+ * at the highest priority level (0).
*
* @param[in, out] flow
* Flow rule handle to update.
@@ -388,6 +391,11 @@ mlx4_flow_merge_udp(struct rte_flow *flow,
msg = "mlx4 does not support matching partial UDP fields";
goto error;
}
+ if (mask && mask->hdr.dst_port && flow->priority) {
+ msg = "combining UDP destination port matching with a nonzero"
+ " priority level is not supported";
+ goto error;
+ }
if (!flow->ibv_attr)
return 0;
++flow->ibv_attr->num_of_specs;
@@ -658,6 +666,7 @@ mlx4_flow_prepare(struct priv *priv,
fill:
overlap = 0;
proc = mlx4_flow_proc_item_list;
+ flow->priority = attr->priority;
/* Go over pattern. */
for (item = pattern; item->type; ++item) {
const struct mlx4_flow_proc_item *next = NULL;
diff --git a/drivers/net/mlx4/mlx4_flow.h b/drivers/net/mlx4/mlx4_flow.h
index 7b83d74b0..2c8dff362 100644
--- a/drivers/net/mlx4/mlx4_flow.h
+++ b/drivers/net/mlx4/mlx4_flow.h
@@ -42,6 +42,7 @@ struct rte_flow {
uint32_t promisc:1; /**< This rule matches everything. */
uint32_t allmulti:1; /**< This rule matches all multicast traffic. */
uint32_t drop:1; /**< This rule drops packets. */
+ uint32_t priority; /**< Flow rule priority. */
struct mlx4_rss *rss; /**< Rx target. */
};
--
2.11.0
