net/mlx5e: Fix ethtool -N flow-type ip4 to RSS context

There commands can be used to add an RSS context and steer some traffic
into it:

    # ethtool -X eth0 context new
    New RSS context is 1
    # ethtool -N eth0 flow-type ip4 dst-ip 1.1.1.1 context 1
    Added rule with ID 1023

However, the second command fails with EINVAL on mlx5e:

    # ethtool -N eth0 flow-type ip4 dst-ip 1.1.1.1 context 1
    rmgr: Cannot insert RX class rule: Invalid argument
    Cannot insert classification rule

It happens when flow_get_tirn calls flow_type_to_traffic_type with
flow_type = IP_USER_FLOW or IPV6_USER_FLOW. That function only handles
IPV4_FLOW and IPV6_FLOW cases, but unlike all other cases which are
common for hash and spec, IPv4 and IPv6 defines different contants for
hash and for spec:

    #define	TCP_V4_FLOW	0x01	/* hash or spec (tcp_ip4_spec) */
    #define	UDP_V4_FLOW	0x02	/* hash or spec (udp_ip4_spec) */
    ...
    #define	IPV4_USER_FLOW	0x0d	/* spec only (usr_ip4_spec) */
    #define	IP_USER_FLOW	IPV4_USER_FLOW
    #define	IPV6_USER_FLOW	0x0e	/* spec only (usr_ip6_spec; nfc only) */
    #define	IPV4_FLOW	0x10	/* hash only */
    #define	IPV6_FLOW	0x11	/* hash only */

Extend the switch in flow_type_to_traffic_type to support both, which
fixes the failing ethtool -N command with flow-type ip4 or ip6.

Fixes: 248d3b4c ("net/mlx5e: Support flow classification into RSS contexts")
Signed-off-by: Maxim Mikityanskiy <maxim@isovalent.com>
Tested-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250319124508.3979818-1-maxim@isovalent.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>