[PATCH] net/ixgbe: fix spurious MACsec event on E610

[Burakov, Anatoly]

On 9/23/2026 1:25 PM, Sandeep Penigalapati wrote:
> On 82599 and X5xx, EICR bit 0x00200000 is the MACsec PN-threshold cause
> (IXGBE_EICR_LINKSEC). On E610 the very same bit is redefined as the
> asynchronous firmware event cause (IXGBE_EICR_FW_EVENT). The interrupt
> handler decoded this bit unconditionally as LINKSEC and raised
> RTE_ETH_EVENT_MACSEC.
> 
> As E610 does not support MACsec, every firmware event (for example a
> link change) was reported to the application as a spurious MACsec event.
> In addition, the firmware events posted on the Admin Command Interface
> (ACI) receive queue were never drained, so the cause was not cleared.
> 
> Decode the bit per MAC type: on E610 treat it as a firmware event and
> drain the ACI receive queue until empty; keep the MACsec handling for
> the other MAC types. Link changes continue to be handled through the
> existing IXGBE_EICR_LSC path.
> 
> Fixes: 316637762a5f ("net/ixgbe/base: enable E610 device")
> Cc: stable at dpdk.org
> Signed-off-by: Sandeep Penigalapati <sandeep.penigalapati at intel.com>
> ---

Reviewed-by: Anatoly Burakov <anatoly.burakov at intel.com>

-- 
Thanks,
Anatoly