sfc: Enable a VF to get its own MAC address

A VF's MAC address is set by its parent PF and added to its vport.
To get this MAC address, the VF must use MC_CMD_ VPORT_GET_MAC_ADDRESSES.
In the current scheme, a VF's vport should only have one MAC address,
so warn if this is not the case.

Signed-off-by: Shradha Shah <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/sfc/ef10.c

···
 	return rc > 0 ? rc : -ERANGE;
 }
 
-static int efx_ef10_get_mac_address(struct efx_nic *efx, u8 *mac_address)
+static int efx_ef10_get_mac_address_pf(struct efx_nic *efx, u8 *mac_address)
 {
 	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_MAC_ADDRESSES_OUT_LEN);
 	size_t outlen;
···
 
 	ether_addr_copy(mac_address,
 			MCDI_PTR(outbuf, GET_MAC_ADDRESSES_OUT_MAC_ADDR_BASE));
+	return 0;
+}
+
+static int efx_ef10_get_mac_address_vf(struct efx_nic *efx, u8 *mac_address)
+{
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_VPORT_GET_MAC_ADDRESSES_IN_LEN);
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_VPORT_GET_MAC_ADDRESSES_OUT_LENMAX);
+	size_t outlen;
+	int num_addrs, rc;
+
+	MCDI_SET_DWORD(inbuf, VPORT_GET_MAC_ADDRESSES_IN_VPORT_ID,
+		       EVB_PORT_ID_ASSIGNED);
+	rc = efx_mcdi_rpc(efx, MC_CMD_VPORT_GET_MAC_ADDRESSES, inbuf,
+			  sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
+
+	if (rc)
+		return rc;
+	if (outlen < MC_CMD_VPORT_GET_MAC_ADDRESSES_OUT_LENMIN)
+		return -EIO;
+
+	num_addrs = MCDI_DWORD(outbuf,
+			       VPORT_GET_MAC_ADDRESSES_OUT_MACADDR_COUNT);
+
+	WARN_ON(num_addrs != 1);
+
+	ether_addr_copy(mac_address,
+			MCDI_PTR(outbuf, VPORT_GET_MAC_ADDRESSES_OUT_MACADDR));
+
 	return 0;
 }
 
···
 		goto fail3;
 	efx->port_num = rc;
 
-	rc = efx_ef10_get_mac_address(efx, efx->net_dev->perm_addr);
+	rc = efx->type->get_mac_address(efx, efx->net_dev->perm_addr);
 	if (rc)
 		goto fail3;
 
···
 	.vswitching_restore = efx_ef10_vswitching_restore_vf,
 	.vswitching_remove = efx_ef10_vswitching_remove_vf,
 #endif
+	.get_mac_address = efx_ef10_get_mac_address_vf,
+
 	.revision = EFX_REV_HUNT_A0,
 	.max_dma_mask = DMA_BIT_MASK(ESF_DZ_TX_KER_BUF_ADDR_WIDTH),
 	.rx_prefix_size = ES_DZ_RX_PREFIX_SIZE,
···
 	.vswitching_restore = efx_ef10_vswitching_restore_pf,
 	.vswitching_remove = efx_ef10_vswitching_remove_pf,
 #endif
+	.get_mac_address = efx_ef10_get_mac_address_pf,
 
 	.revision = EFX_REV_HUNT_A0,
 	.max_dma_mask = DMA_BIT_MASK(ESF_DZ_TX_KER_BUF_ADDR_WIDTH),

drivers/net/ethernet/sfc/net_driver.h

···
 	int (*vswitching_probe)(struct efx_nic *efx);
 	int (*vswitching_restore)(struct efx_nic *efx);
 	void (*vswitching_remove)(struct efx_nic *efx);
+	int (*get_mac_address)(struct efx_nic *efx, unsigned char *perm_addr);
 
 	int revision;
 	unsigned int txd_ptr_tbl_base;