diff mbox series

cxgb4vf: Remove useless DMA-32 fallback configuration

Message ID b14986ea39cea2ca9a6cd0476a3fc167c853ee67.1641736772.git.christophe.jaillet@wanadoo.fr (mailing list archive)
State Accepted
Commit 030f9ce8c739a5cfa420291188023b7741b7bc73
Delegated to: Netdev Maintainers
Headers show
Series cxgb4vf: Remove useless DMA-32 fallback configuration | expand

Checks

Context Check Description
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 40 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Christophe JAILLET Jan. 9, 2022, 1:59 p.m. UTC
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>
---
 .../ethernet/chelsio/cxgb4vf/cxgb4vf_main.c   | 20 +++++--------------
 1 file changed, 5 insertions(+), 15 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Jan. 10, 2022, 1 a.m. UTC | #1
Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Sun,  9 Jan 2022 14:59:48 +0100 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - cxgb4vf: Remove useless DMA-32 fallback configuration
    https://git.kernel.org/netdev/net-next/c/030f9ce8c739

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
index acac2be0e3f0..7de3800437c9 100644
--- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
@@ -2899,7 +2899,6 @@  static int cxgb4vf_pci_probe(struct pci_dev *pdev,
 	struct net_device *netdev;
 	struct port_info *pi;
 	unsigned int pmask;
-	int pci_using_dac;
 	int err, pidx;
 
 	/*
@@ -2920,19 +2919,12 @@  static int cxgb4vf_pci_probe(struct pci_dev *pdev,
 	}
 
 	/*
-	 * Set up our DMA mask: try for 64-bit address masking first and
-	 * fall back to 32-bit if we can't get 64 bits ...
+	 * Set up our DMA mask
 	 */
 	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-	if (err == 0) {
-		pci_using_dac = 1;
-	} else {
-		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (err != 0) {
-			dev_err(&pdev->dev, "no usable DMA configuration\n");
-			goto err_release_regions;
-		}
-		pci_using_dac = 0;
+	if (err) {
+		dev_err(&pdev->dev, "no usable DMA configuration\n");
+		goto err_release_regions;
 	}
 
 	/*
@@ -3078,9 +3070,7 @@  static int cxgb4vf_pci_probe(struct pci_dev *pdev,
 		netdev->hw_features = NETIF_F_SG | TSO_FLAGS | NETIF_F_GRO |
 			NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM |
 			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
-		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 & VLAN_FEAT;
 
 		netdev->priv_flags |= IFF_UNICAST_FLT;