* [PATCH] ixgbevf: Remove useless DMA-32 fallback configuration
@ 2022-01-09 17:22 Christophe JAILLET
2022-01-13 17:48 ` [Intel-wired-lan] " G, GurucharanX
0 siblings, 1 reply; 2+ messages in thread
From: Christophe JAILLET @ 2022-01-09 17:22 UTC (permalink / raw)
To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Jakub Kicinski
Cc: linux-kernel, kernel-janitors, Christophe JAILLET,
Christoph Hellwig, Alexander Lobakin, intel-wired-lan, netdev
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>
---
.../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 20 ++++++-------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 0015fcf1df2b..7c33be9074e9 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -4511,22 +4511,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
struct ixgbevf_adapter *adapter = NULL;
struct ixgbe_hw *hw = NULL;
const struct ixgbevf_info *ii = ixgbevf_info_tbl[ent->driver_data];
- int err, pci_using_dac;
bool disable_dev = false;
+ int err;
err = pci_enable_device(pdev);
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_regions(pdev, ixgbevf_driver_name);
@@ -4606,10 +4601,7 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev->hw_features |= NETIF_F_GSO_PARTIAL |
IXGBEVF_GSO_PARTIAL_FEATURES;
- netdev->features = netdev->hw_features;
-
- if (pci_using_dac)
- netdev->features |= NETIF_F_HIGHDMA;
+ netdev->features = netdev->hw_features | NETIF_F_HIGHDMA;
netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
netdev->mpls_features |= NETIF_F_SG |
--
2.32.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* RE: [Intel-wired-lan] [PATCH] ixgbevf: Remove useless DMA-32 fallback configuration
2022-01-09 17:22 [PATCH] ixgbevf: Remove useless DMA-32 fallback configuration Christophe JAILLET
@ 2022-01-13 17:48 ` G, GurucharanX
0 siblings, 0 replies; 2+ messages in thread
From: G, GurucharanX @ 2022-01-13 17:48 UTC (permalink / raw)
To: Christophe JAILLET, Brandeburg, Jesse, Nguyen, Anthony L,
David S. Miller, Jakub Kicinski
Cc: netdev, kernel-janitors, linux-kernel, intel-wired-lan,
Christoph Hellwig
> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Christophe JAILLET
> Sent: Sunday, January 9, 2022 10:52 PM
> To: Brandeburg, Jesse <jesse.brandeburg@intel.com>; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>; David S. Miller <davem@davemloft.net>;
> Jakub Kicinski <kuba@kernel.org>
> Cc: netdev@vger.kernel.org; kernel-janitors@vger.kernel.org; linux-
> kernel@vger.kernel.org; Christophe JAILLET
> <christophe.jaillet@wanadoo.fr>; intel-wired-lan@lists.osuosl.org; Christoph
> Hellwig <hch@lst.de>
> Subject: [Intel-wired-lan] [PATCH] ixgbevf: Remove useless DMA-32 fallback
> configuration
>
> 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>
> ---
> .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 20 ++++++-------------
> 1 file changed, 6 insertions(+), 14 deletions(-)
>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
^ permalink raw reply [flat|nested] 2+ messages in thread
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