[PATCH v6 net-next 6/8] sfc: obtain device mac address based on firmware handle for ef100

[<alejandro.lucero-palau@xxxxxxx>]

From: Alejandro Lucero <alejandro.lucero-palau@xxxxxxx>

Getting device mac address is currently based on a specific MCDI command
only available for the PF. This patch changes the MCDI command to a
generic one for PFs and VFs based on a client handle. This allows both
PFs and VFs to ask for their mac address during initialization using the
CLIENT_HANDLE_SELF.

Moreover, the patch allows other client handles which will be used by
the PF to ask for mac addresses linked to VFs. This is necessary for
suporting the port_function_hw_addr_get devlink function in further
patches.

Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@xxxxxxx>
---
 drivers/net/ethernet/sfc/ef100_netdev.c | 10 +++++++
 drivers/net/ethernet/sfc/ef100_nic.c    | 37 +++++++++++++------------
 drivers/net/ethernet/sfc/ef100_nic.h    |  2 ++
 3 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index 368147359299..d916877b5a9a 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -359,6 +359,7 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
 {
 	struct efx_nic *efx = &probe_data->efx;
 	struct efx_probe_data **probe_ptr;
+	struct ef100_nic_data *nic_data;
 	struct net_device *net_dev;
 	int rc;
 
@@ -410,6 +411,15 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
 	/* Don't fail init if RSS setup doesn't work. */
 	efx_mcdi_push_default_indir_table(efx, efx->n_rx_channels);
 
+	nic_data = efx->nic_data;
+	rc = ef100_get_mac_address(efx, net_dev->perm_addr, CLIENT_HANDLE_SELF,
+				   efx->type->is_vf);
+	if (rc)
+		return rc;
+	/* Assign MAC address */
+	eth_hw_addr_set(net_dev, net_dev->perm_addr);
+	ether_addr_copy(nic_data->port_id, net_dev->perm_addr);
+
 	/* devlink creation, registration and lock */
 	rc = efx_probe_devlink_and_lock(efx);
 	if (rc)
diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index aa11f0925e27..aa48c79a2149 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -130,23 +130,34 @@ static void ef100_mcdi_reboot_detected(struct efx_nic *efx)
 
 /*	MCDI calls
  */
-static int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address)
+int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
+			  int client_handle, bool empty_ok)
 {
-	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_MAC_ADDRESSES_OUT_LEN);
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CLIENT_MAC_ADDRESSES_OUT_LEN(1));
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_CLIENT_MAC_ADDRESSES_IN_LEN);
 	size_t outlen;
 	int rc;
 
 	BUILD_BUG_ON(MC_CMD_GET_MAC_ADDRESSES_IN_LEN != 0);
+	MCDI_SET_DWORD(inbuf, GET_CLIENT_MAC_ADDRESSES_IN_CLIENT_HANDLE,
+		       client_handle);
 
-	rc = efx_mcdi_rpc(efx, MC_CMD_GET_MAC_ADDRESSES, NULL, 0,
-			  outbuf, sizeof(outbuf), &outlen);
+	rc = efx_mcdi_rpc(efx, MC_CMD_GET_CLIENT_MAC_ADDRESSES, inbuf,
+			  sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
 	if (rc)
 		return rc;
-	if (outlen < MC_CMD_GET_MAC_ADDRESSES_OUT_LEN)
-		return -EIO;
 
-	ether_addr_copy(mac_address,
-			MCDI_PTR(outbuf, GET_MAC_ADDRESSES_OUT_MAC_ADDR_BASE));
+	if (outlen >= MC_CMD_GET_CLIENT_MAC_ADDRESSES_OUT_LEN(1)) {
+		ether_addr_copy(mac_address,
+				MCDI_PTR(outbuf, GET_CLIENT_MAC_ADDRESSES_OUT_MAC_ADDRS));
+	} else if (empty_ok) {
+		pci_warn(efx->pci_dev,
+			 "No MAC address provisioned for client ID %#x.\n",
+			 client_handle);
+		eth_zero_addr(mac_address);
+	} else {
+		return -ENOENT;
+	}
 	return 0;
 }
 
@@ -1117,13 +1128,6 @@ int ef100_probe_netdev_pf(struct efx_nic *efx)
 	struct net_device *net_dev = efx->net_dev;
 	int rc;
 
-	rc = ef100_get_mac_address(efx, net_dev->perm_addr);
-	if (rc)
-		goto fail;
-	/* Assign MAC address */
-	eth_hw_addr_set(net_dev, net_dev->perm_addr);
-	memcpy(nic_data->port_id, net_dev->perm_addr, ETH_ALEN);
-
 	if (!nic_data->grp_mae)
 		return 0;
 
@@ -1163,9 +1167,6 @@ int ef100_probe_netdev_pf(struct efx_nic *efx)
 		efx->fixed_features |= NETIF_F_HW_TC;
 	}
 #endif
-	return 0;
-
-fail:
 	return rc;
 }
 
diff --git a/drivers/net/ethernet/sfc/ef100_nic.h b/drivers/net/ethernet/sfc/ef100_nic.h
index 496aea43c60f..e59044072333 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.h
+++ b/drivers/net/ethernet/sfc/ef100_nic.h
@@ -92,4 +92,6 @@ int efx_ef100_init_datapath_caps(struct efx_nic *efx);
 int ef100_phy_probe(struct efx_nic *efx);
 int ef100_filter_table_probe(struct efx_nic *efx);
 
+int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
+			  int client_handle, bool empty_ok);
 #endif	/* EFX_EF100_NIC_H */
-- 
2.17.1