net/mlx5: fix shared RSS translation and cleanup

net/mlx5: fix shared RSS translation and cleanup

This patch includes several updates of the shared RSS action:

(1)
The shared RSS action, introduced recently, uses existing definitions
of the regular RSS action.
The new defined value MLX5_RSS_HASH_IPV4_TCP uses existing definition
IBV_RX_HASH_SRC_PORT_TCP twice, instead of using
IBV_RX_HASH_SRC_PORT_TCP and IBV_RX_HASH_DST_PORT_TCP.
            ---                          ---
The same is true for IPv4-UDP, IPv6-TCP, IPv6-UDP.
As result, a shared RSS action with L4 type is specified as src-only.
Flow rule using such shared action, while specifying L4 item in flow
pattern, will fail to create.
This patch updates the new definitions, to use the existing values
correctly.

(2)
On shared RSS action destroy, in function __flow_dv_action_rss_release,
the indirection table shared_rss->ind_tbl was released before
shared_rss->refcnt was checked.
This order is incorrect, since the indirection table should be
released only when the shared RSS action is destroyed.
This patch puts release function calls in correct order.

(3)
Variables declared of type "struct mlx5_shared_action_rss" are named
"shared_rss", "action", and "shared_action".
To improve code readability, this patch renames all to "shared_rss".

Fixes: d7cfcddded61 ("net/mlx5: translate shared action for RSS action")
Fixes: d2046c09aa64 ("net/mlx5: support shared action for RSS")
Cc: stable@dpdk.org
Signed-off-by: Dekel Peled <dekelp@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>