net/mlx5: fix flow rules with Verbs

net/mlx5: fix flow rules with Verbs

The flow_verbs_translate() function accumulates hash fields while
iterating through the flow items (SRC_IPV4, DST_IPV4, SRC_IPV6,
DST_IPV6, SRC_PORT_TCP, DST_PORT_TCP, SRC_PORT_UDP, DST_PORT_UDP).
Before this commit the dev_flow handle structure was reused in each new
flow_verbs_translate() call, however the dev_flow->hash_fields variable
was not reset before each call. As a result hash_fields from previous
calls remained present in the current flow which lead to invalid
combinations (e.g.  simultaneous IPv4 and IPv6 specs). This scenario
happens for example in the next flows sequence, when running in verbs
mode (dv_flow_en=0).

flow create 0 ingress group 0 pattern eth / ipv4 / end <rss actions>
flow create 0 ingress group 0 pattern eth / ipv6 / end <rss actions>

The fix is to reset dev_flow->hash_fields in flow_verbs_prepare().

Fixes: e7bfa3596a0a ("net/mlx5: separate the flow handle resource")

Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>