net/mlx5e: Fix VXLAN synchronization after function reload

During driver reload, perform firmware tear-down which results in
firmware losing the configured VXLAN ports. These ports are still
available in the driver's database. Fix this by cleaning up driver's
VXLAN database in the nic unload flow, before firmware tear-down. With
that, minimize mlx5_vxlan_destroy() to remove only what was added in
mlx5_vxlan_create() and warn on leftover UDP ports.

Fixes: 18a2b7f969c9 ("net/mlx5: convert to new udp_tunnel infrastructure")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

net/mlx5: convert to new udp_tunnel infrastructure

Allocate nic_info dynamically - n_entries is not constant.

Attach the tunnel offload info only to the uplink representor.
We expect the "main" netdev to be unregistered in switchdev
mode, and there to be only one uplink representor.

Drop the udp_tunnel_drop_rx_info() call, it was not there until
commit b3c2ed21c0bd ("net/mlx5e: Fix VXLAN configuration restore after function reload")
so the device doesn't need it, and core should handle reloads and
reset just fine.

v2:
- don't drop the ndos on reprs, and register info on uplink repr.
v4:
- Move netdev tunnel structure handling to en_main.c

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

net/mlx5e: vxlan: Return bool instead of opaque ptr in port_lookup()

struct mlx5_vxlan_port is not exposed to the outside callers, it is
redundant to return a pointer to it from mlx5_vxlan_port_lookup(), to be
only used as a boolean, so just return a boolean.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

net/mlx5e: vxlan.c depends on CONFIG_VXLAN

When vxlan is not enabled by kernel, no need to enable it in mlx5.
Compile out lib/vxlan.c if CONFIG_VXLAN is not selected.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>

net/mlx5e: Vxlan, move vxlan logic to core driver

Move vxlan logic and objects to mlx5 core dirver.
Since it going to be used from different mlx5 interfaces.
e.g. mlx5e PF NIC netdev and mlx5e E-Switch representors.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>