sfc: Add NIC type operations to replace direct calls from efx.c into siena_sriov.c

Also add dummy functions where required to avoid NULL pointer dereference.

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index cf40d60..3583f02 100644
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -997,6 +997,11 @@
 #endif
 	.ptp_write_host_time = siena_ptp_write_host_time,
 	.ptp_set_ts_config = siena_ptp_set_ts_config,
+	.sriov_init = efx_siena_sriov_init,
+	.sriov_fini = efx_siena_sriov_fini,
+	.sriov_mac_address_changed = efx_siena_sriov_mac_address_changed,
+	.sriov_wanted = efx_siena_sriov_wanted,
+	.sriov_reset = efx_siena_sriov_reset,
 
 	.revision = EFX_REV_SIENA_A0,
 	.txd_ptr_tbl_base = FR_BZ_TX_DESC_PTR_TBL,