sfc: Check firmware supports Ethernet PTP filter

Not all firmware variants support RSS filters. Do not fail all PTP
functionality when raw ethernet PTP filters fail to insert.

Fixes: e4616f6 ("sfc: support PTP over Ethernet")
Signed-off-by: Alex Austin <[email protected]>
Acked-by: Edward Cree <[email protected]>
Reviewed-by: Pieter Jansen van Vuuren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: alexaust-xlnx

drivers/net/ethernet/sfc/ptp.c

@@ -1485,7 +1485,9 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
 			goto fail;
 
 		rc = efx_ptp_insert_eth_multicast_filter(efx);
-		if (rc < 0)
+
+		/* Not all firmware variants support this filter */
+		if (rc < 0 && rc != -EPROTONOSUPPORT)
 			goto fail;
 	}