[PATCH net] sfc: Check firmware supports Ethernet PTP filter

[alex.austin]

From: Alex Austin <alex.austin@xxxxxxx>

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

Fixes: e4616f64726b ("sfc: support PTP over Ethernet")
Signed-off-by: Alex Austin <alex.austin@xxxxxxx>
Acked-by: Edward Cree <ecree.xilinx@xxxxxxxxx>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@xxxxxxx>
---
 drivers/net/ethernet/sfc/ptp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 0c40571133cb..00cf6de3bb2b 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/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;
 	}
 
-- 
2.17.1