diff mbox series

ethernet: s2io: Use dma_set_mask_and_coherent() and simplify code

Message ID e53afd59c8938bfaaa94cadd4621d40f54ec2102.1641155181.git.christophe.jaillet@wanadoo.fr (mailing list archive)
State Accepted
Commit 7120075ec41aed3bf377df7924d213f1c43f7462
Delegated to: Netdev Maintainers
Headers show
Series ethernet: s2io: Use dma_set_mask_and_coherent() and simplify code | expand

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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: 17 this patch: 17
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: 1 this patch: 1
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 50 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. 2, 2022, 8:27 p.m. UTC 
Use dma_set_mask_and_coherent() instead of unrolling it with some
dma_set_mask()+dma_set_coherent_mask().

Moreover, 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.

That said, 'dma_flag' can only be 'true' after a successful
dma_set_mask_and_coherent().

Simplify code and remove some dead code accordingly, including the now
useless 'high_dma_flag' field in 'struct s2io_nic'.

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

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/net/ethernet/neterion/s2io.c | 18 +++---------------
 drivers/net/ethernet/neterion/s2io.h |  1 -
 2 files changed, 3 insertions(+), 16 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Jan. 3, 2022, 10:50 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sun,  2 Jan 2022 21:27:39 +0100 you wrote:
> Use dma_set_mask_and_coherent() instead of unrolling it with some
> dma_set_mask()+dma_set_coherent_mask().
> 
> Moreover, 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.
> 
> [...]

Here is the summary with links:
  - ethernet: s2io: Use dma_set_mask_and_coherent() and simplify code
    https://git.kernel.org/netdev/net-next/c/7120075ec41a

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
index d6ae44f164a9..6dd451adc331 100644
--- a/drivers/net/ethernet/neterion/s2io.c
+++ b/drivers/net/ethernet/neterion/s2io.c
@@ -7658,7 +7658,6 @@  s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	struct s2io_nic *sp;
 	struct net_device *dev;
 	int i, j, ret;
-	int dma_flag = false;
 	u32 mac_up, mac_down;
 	u64 val64 = 0, tmp64 = 0;
 	struct XENA_dev_config __iomem *bar0 = NULL;
@@ -7680,17 +7679,8 @@  s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 		return ret;
 	}
 
-	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
+	if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
 		DBG_PRINT(INIT_DBG, "%s: Using 64bit DMA\n", __func__);
-		dma_flag = true;
-		if (dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
-			DBG_PRINT(ERR_DBG,
-				  "Unable to obtain 64bit DMA for coherent allocations\n");
-			pci_disable_device(pdev);
-			return -ENOMEM;
-		}
-	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
-		DBG_PRINT(INIT_DBG, "%s: Using 32bit DMA\n", __func__);
 	} else {
 		pci_disable_device(pdev);
 		return -ENOMEM;
@@ -7720,7 +7710,6 @@  s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	sp = netdev_priv(dev);
 	sp->dev = dev;
 	sp->pdev = pdev;
-	sp->high_dma_flag = dma_flag;
 	sp->device_enabled_once = false;
 	if (rx_ring_mode == 1)
 		sp->rxd_mode = RXD_MODE_1;
@@ -7868,9 +7857,8 @@  s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 		NETIF_F_TSO | NETIF_F_TSO6 |
 		NETIF_F_RXCSUM | NETIF_F_LRO;
 	dev->features |= dev->hw_features |
-		NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
-	if (sp->high_dma_flag == true)
-		dev->features |= NETIF_F_HIGHDMA;
+		NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
+		NETIF_F_HIGHDMA;
 	dev->watchdog_timeo = WATCH_DOG_TIMEOUT;
 	INIT_WORK(&sp->rst_timer_task, s2io_restart_nic);
 	INIT_WORK(&sp->set_link_task, s2io_set_link);
diff --git a/drivers/net/ethernet/neterion/s2io.h b/drivers/net/ethernet/neterion/s2io.h
index a4266d1544ab..cb7080eb5912 100644
--- a/drivers/net/ethernet/neterion/s2io.h
+++ b/drivers/net/ethernet/neterion/s2io.h
@@ -873,7 +873,6 @@  struct s2io_nic {
 	struct mac_addr def_mac_addr[256];
 
 	struct net_device_stats stats;
-	int high_dma_flag;
 	int device_enabled_once;
 
 	char name[60];