qlcnic: Simplify DMA setting

As stated in [1], dma_set_mask() with a 64-bit mask will never fail if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

So qlcnic_set_dma_mask(), (in qlcnic_main.c) can be simplified a lot and
inlined directly in its only caller.

If dma_set_mask_and_coherent() succeeds, 'pci_using_dac' is known to be 1.
So it can be removed from all the calling chain.

qlcnic_setup_netdev() can finally be simplified as-well.

[1]: https://lkml.org/lkml/2021/6/7/398

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/4996ab0337[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

···
 int qlcnic_set_vxlan_parsing(struct qlcnic_adapter *adapter, u16 port);
 int qlcnic_83xx_configure_opmode(struct qlcnic_adapter *adapter);
 int qlcnic_read_mac_addr(struct qlcnic_adapter *);
-int qlcnic_setup_netdev(struct qlcnic_adapter *, struct net_device *, int);
+int qlcnic_setup_netdev(struct qlcnic_adapter *, struct net_device *);
 void qlcnic_set_netdev_features(struct qlcnic_adapter *,
 				struct qlcnic_esw_func_cfg *);
 void qlcnic_sriov_vf_set_multi(struct net_device *);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.h

···
 int qlcnic_83xx_flash_read32(struct qlcnic_adapter *, u32, u8 *, int);
 int qlcnic_83xx_lockless_flash_read32(struct qlcnic_adapter *,
 				      u32, u8 *, int);
-int qlcnic_83xx_init(struct qlcnic_adapter *, int);
+int qlcnic_83xx_init(struct qlcnic_adapter *);
 int qlcnic_83xx_idc_ready_state_entry(struct qlcnic_adapter *);
 void qlcnic_83xx_idc_poll_dev_state(struct work_struct *);
 void qlcnic_83xx_idc_exit(struct qlcnic_adapter *);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c

···
 	qlcnic_set_sds_ring_count(adapter, rx_cnt);
 }
 
-int qlcnic_83xx_init(struct qlcnic_adapter *adapter, int pci_using_dac)
+int qlcnic_83xx_init(struct qlcnic_adapter *adapter)
 {
 	struct qlcnic_hardware_context *ahw = adapter->ahw;
 	int err = 0;
···
 		goto exit;
 
 	if (qlcnic_sriov_vf_check(adapter)) {
-		err = qlcnic_sriov_vf_init(adapter, pci_using_dac);
+		err = qlcnic_sriov_vf_init(adapter);
 		if (err)
 			goto detach_mbx;
 		else

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

···
 }
 
 int
-qlcnic_setup_netdev(struct qlcnic_adapter *adapter, struct net_device *netdev,
-		    int pci_using_dac)
+qlcnic_setup_netdev(struct qlcnic_adapter *adapter, struct net_device *netdev)
 {
 	int err;
 	struct pci_dev *pdev = adapter->pdev;
···
 
 	netdev->features |= (NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
 			     NETIF_F_IPV6_CSUM | NETIF_F_GRO |
-			     NETIF_F_HW_VLAN_CTAG_RX);
+			     NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HIGHDMA);
 	netdev->vlan_features |= (NETIF_F_SG | NETIF_F_IP_CSUM |
-				  NETIF_F_IPV6_CSUM);
+				  NETIF_F_IPV6_CSUM | NETIF_F_HIGHDMA);
 
 	if (QLCNIC_IS_TSO_CAPABLE(adapter)) {
 		netdev->features |= (NETIF_F_TSO | NETIF_F_TSO6);
 		netdev->vlan_features |= (NETIF_F_TSO | NETIF_F_TSO6);
-	}
-
-	if (pci_using_dac) {
-		netdev->features |= NETIF_F_HIGHDMA;
-		netdev->vlan_features |= NETIF_F_HIGHDMA;
 	}
 
 	if (qlcnic_vlan_tx_check(adapter))
···
 	if (err) {
 		dev_err(&pdev->dev, "failed to register net device\n");
 		return err;
-	}
-
-	return 0;
-}
-
-static int qlcnic_set_dma_mask(struct pci_dev *pdev, int *pci_using_dac)
-{
-	if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)))
-		*pci_using_dac = 1;
-	else if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)))
-		*pci_using_dac = 0;
-	else {
-		dev_err(&pdev->dev, "Unable to set DMA mask, aborting\n");
-		return -EIO;
 	}
 
 	return 0;
···
 	struct net_device *netdev = NULL;
 	struct qlcnic_adapter *adapter = NULL;
 	struct qlcnic_hardware_context *ahw;
-	int err, pci_using_dac = -1;
 	char board_name[QLCNIC_MAX_BOARD_NAME_LEN + 19]; /* MAC + ": " + name */
+	int err;
 
 	err = pci_enable_device(pdev);
 	if (err)
···
 		goto err_out_disable_pdev;
 	}
 
-	err = qlcnic_set_dma_mask(pdev, &pci_using_dac);
-	if (err)
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (err) {
+		dev_err(&pdev->dev, "Unable to set DMA mask, aborting\n");
 		goto err_out_disable_pdev;
+	}
 
 	err = pci_request_regions(pdev, qlcnic_driver_name);
 	if (err)
···
 	} else if (qlcnic_83xx_check(adapter)) {
 		qlcnic_83xx_check_vf(adapter, ent);
 		adapter->portnum = adapter->ahw->pci_func;
-		err = qlcnic_83xx_init(adapter, pci_using_dac);
+		err = qlcnic_83xx_init(adapter);
 		if (err) {
 			switch (err) {
 			case -ENOTRECOVERABLE:
···
 	if (adapter->portnum == 0)
 		qlcnic_set_drv_version(adapter);
 
-	err = qlcnic_setup_netdev(adapter, netdev, pci_using_dac);
+	err = qlcnic_setup_netdev(adapter, netdev);
 	if (err)
 		goto err_out_disable_mbx_intr;
 

drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h

···
 void qlcnic_sriov_cleanup(struct qlcnic_adapter *);
 void __qlcnic_sriov_cleanup(struct qlcnic_adapter *);
 void qlcnic_sriov_vf_register_map(struct qlcnic_hardware_context *);
-int qlcnic_sriov_vf_init(struct qlcnic_adapter *, int);
+int qlcnic_sriov_vf_init(struct qlcnic_adapter *);
 void qlcnic_sriov_vf_set_ops(struct qlcnic_adapter *);
 int qlcnic_sriov_func_to_index(struct qlcnic_adapter *, u8);
 void qlcnic_sriov_handle_bc_event(struct qlcnic_adapter *, u32);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c

···
 	return 0;
 }
 
-static int qlcnic_sriov_setup_vf(struct qlcnic_adapter *adapter,
-				 int pci_using_dac)
+static int qlcnic_sriov_setup_vf(struct qlcnic_adapter *adapter)
 {
 	int err;
 
···
 	if (err)
 		goto err_out_send_channel_term;
 
-	err = qlcnic_setup_netdev(adapter, adapter->netdev, pci_using_dac);
+	err = qlcnic_setup_netdev(adapter, adapter->netdev);
 	if (err)
 		goto err_out_send_channel_term;
 
···
 	return 0;
 }
 
-int qlcnic_sriov_vf_init(struct qlcnic_adapter *adapter, int pci_using_dac)
+int qlcnic_sriov_vf_init(struct qlcnic_adapter *adapter)
 {
 	struct qlcnic_hardware_context *ahw = adapter->ahw;
 	int err;
···
 	if (err)
 		return err;
 
-	err = qlcnic_sriov_setup_vf(adapter, pci_using_dac);
+	err = qlcnic_sriov_setup_vf(adapter);
 	if (err)
 		return err;