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ixgbe: Remove useless DMA-32 fallback configuration

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

So, if dma_set_mask_and_coherent() succeeds, 'pci_using_dac' is known to be
1.

Simplify code and remove some dead code accordingly.

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

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Christophe JAILLET 2022-01-09 18:20:57 +01:00 committed by Tony Nguyen
parent 64953720a2
commit 4d361c6fd8
1 changed files with 7 additions and 13 deletions
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20
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -10632,9 +10632,9 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
struct ixgbe_adapter *adapter = NULL;
struct ixgbe_hw *hw;
const struct ixgbe_info *ii = ixgbe_info_tbl[ent->driver_data];
int i, err, pci_using_dac, expected_gts;
unsigned int indices = MAX_TX_QUEUES;
u8 part_str[IXGBE_PBANUM_LENGTH];
int i, err, expected_gts;
bool disable_dev = false;
#ifdef IXGBE_FCOE
u16 device_caps;
@ -10654,16 +10654,11 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
if (err)
return err;
if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
pci_using_dac = 1;
} else {
err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev,
"No usable DMA configuration, aborting\n");
goto err_dma;
}
pci_using_dac = 0;
err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (err) {
dev_err(&pdev->dev,
"No usable DMA configuration, aborting\n");
goto err_dma;
}
err = pci_request_mem_regions(pdev, ixgbe_driver_name);
@ -10861,8 +10856,7 @@ skip_sriov:
netdev->hw_features |= NETIF_F_NTUPLE |
NETIF_F_HW_TC;
if (pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;
netdev->features |= NETIF_F_HIGHDMA;
netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
netdev->hw_enc_features |= netdev->vlan_features;