[PATCH v2] net/ice: add MAC anti-spoof option

[Morten Brørup]

+TO: Ethdev maintainers, regarding new Ethdev APIs

> From: Anurag Mandal [mailto:anurag.mandal at intel.com]
> Sent: Sunday, 16 November 2025 04.58
> 
> VRRP advertisement packets are dropped as TX-errors upon transmission
> from
> a vsi of ice PF due to MAC anti-spoof check which is enabled by
> default.
> There is no way to disable this check in the Tx direction to avoid
> these packets being dropped.
> 
> This patch introduces devargs "mac-anti-spoof" to allow user to
> disable MAC anti-spoof check. Disable MAC Anti-spoof check
> in the Tx direction to avoid getting dropped as TX-errors upon packet
> transmission when their source MAC address matches one of the MAC
> addresses assigned to that same NIC port.
> 
> Signed-off-by: Anurag Mandal <anurag.mandal at intel.com>
> ---

This is the same story as with Source Prune.
Please disable source-prune filtering by default, and provide an option to enable it.
Also, suggest shortening the devargs name to simply "anti-spoof", like "source-prune"; they both operate on MAC basis.

Let's make something generic instead, to replace those silly devargs.
We have individual Ethdev APIs to enable/disable various Rx filtering, e.g. "promiscuous", "all multicast".
Obviously, we don't want to introduce new APIs for every semi-exotic filter any NIC may offer, like "source prune" and "anti spoof", but we could introduce a set of generic Ethdev APIs to support filters such as these, using a bitfield enum. E.g.:

/* Enable one or more filters. */
int rte_ethdev_filter_enable(uin16_t port_id, uint64_t filter);

/* Disable one or more filters. */
int rte_ethdev_filter_disable(uin16_t port_id, uint64_t filter);

/* Get bit field of filters enabled. */
int64_t rte_ethdev_filter_get(uin16_t port_id);

/* Get bit field of filters supported by device. */
int64_t rte_ethdev_filter_capa(uin16_t port_id); /**/

/** Destination MAC must match NIC's MAC address.
 * (This is the inverse of Promiscuous.)
 * Default enabled.
 */
#define RTE_ETH_FILTER_RX_NON_PROMISC RTE_BIT64(0)
/** Multicast Hash.
 * (This is the inverse of All Multicast.)
 * Default enabled.
 */
#define RTE_ETH_FILTER_RX_MULTICAST RTE_BIT64(1)
/** Source Prune.
 * [Insert description here.]
 */
#define RTE_ETH_FILTER_RX_SOURCE_PRUNE RTE_BIT64(2)
/* Add new Rx filters here, in increasing order. */
/* Add new Tx filters here, in decreasing order. */
/** Anti-Spoof.
 * [Insert description here.]
 */
#define RTE_ETH_FILTER_RX_SOURCE_PRUNE RTE_BIT64(62)
/** Used for error return values which are negative. */
#define RTE_ETH_FILTER_ERROR           RTE_BIT64(63)