diff mbox series

[net,v2,1/4] net: sgi: ioc3-eth: don't abuse dma_direct_* calls

Message ID 20191103103433.26826-1-tbogendoerfer@suse.de (mailing list archive)
State Superseded
Headers show
Series [net,v2,1/4] net: sgi: ioc3-eth: don't abuse dma_direct_* calls | expand

Commit Message

Thomas Bogendoerfer Nov. 3, 2019, 10:34 a.m. UTC 
From: Christoph Hellwig <hch@lst.de>

dma_direct_ is a low-level API that must never be used by drivers
directly.  Switch to use the proper DMA API instead.

Change in v2:
- ensure that tx ring is 16kB aligned

Fixes: ed870f6a7aa2 ("net: sgi: ioc3-eth: use dma-direct for dma allocations")
Signed-off-by: Christoph Hellwig <hch@lst.de>

---
 drivers/net/ethernet/sgi/ioc3-eth.c | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

Comments

Christoph Hellwig Nov. 4, 2019, 12:34 a.m. UTC | #1 
On Sun, Nov 03, 2019 at 11:34:30AM +0100, Thomas Bogendoerfer wrote:
> From: Christoph Hellwig <hch@lst.de>
> 
> dma_direct_ is a low-level API that must never be used by drivers
> directly.  Switch to use the proper DMA API instead.
> 
> Change in v2:
> - ensure that tx ring is 16kB aligned

FYI, I think this should be a separate patch.  The lack of explicitly
alignment was just as broken before this patch as it is now.
Carlo Pisani Nov. 4, 2019, 12:45 a.m. UTC | #2 
hi
I am currently writing code to support a PowerPC's bootloader
(PPC405GP), hence I wonder if I can reuse part of the code to also
write a bootloader for IP30

kind of u-boot for Octane

but I wonder how difficult it will go about the network card. I don't
need high performance, and if there is a bit of doc not in form of ...
kernel code. I mean some document, like a datasheet.

The netcard needs to be only used for TFTPBOOT, hence for udp/ip.
diff mbox series

Patch

diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index deb636d653f3..4879dedf1f60 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -48,7 +48,7 @@ 
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/skbuff.h>
-#include <linux/dma-direct.h>
+#include <linux/dma-mapping.h>
 
 #include <net/ip.h>
 
@@ -89,6 +89,7 @@  struct ioc3_private {
 	struct device *dma_dev;
 	u32 *ssram;
 	unsigned long *rxr;		/* pointer to receiver ring */
+	void *tx_ring;
 	struct ioc3_etxd *txr;
 	dma_addr_t rxr_dma;
 	dma_addr_t txr_dma;
@@ -1242,8 +1243,8 @@  static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	ioc3_stop(ip);
 
 	/* Allocate rx ring.  4kb = 512 entries, must be 4kb aligned */
-	ip->rxr = dma_direct_alloc_pages(ip->dma_dev, RX_RING_SIZE,
-					 &ip->rxr_dma, GFP_ATOMIC, 0);
+	ip->rxr = dma_alloc_coherent(ip->dma_dev, RX_RING_SIZE, &ip->rxr_dma,
+				     GFP_ATOMIC);
 	if (!ip->rxr) {
 		pr_err("ioc3-eth: rx ring allocation failed\n");
 		err = -ENOMEM;
@@ -1251,14 +1252,16 @@  static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 
 	/* Allocate tx rings.  16kb = 128 bufs, must be 16kb aligned  */
-	ip->txr = dma_direct_alloc_pages(ip->dma_dev, TX_RING_SIZE,
-					 &ip->txr_dma,
-					 GFP_KERNEL | __GFP_ZERO, 0);
-	if (!ip->txr) {
+	ip->tx_ring = dma_alloc_coherent(ip->dma_dev, TX_RING_SIZE + SZ_16K - 1,
+					 &ip->txr_dma, GFP_KERNEL | __GFP_ZERO);
+	if (!ip->tx_ring) {
 		pr_err("ioc3-eth: tx ring allocation failed\n");
 		err = -ENOMEM;
 		goto out_stop;
 	}
+	/* Align TX ring */
+	ip->txr = PTR_ALIGN(ip->tx_ring, SZ_16K);
+	ip->txr_dma = ALIGN(ip->txr_dma, SZ_16K);
 
 	ioc3_init(dev);
 
@@ -1313,11 +1316,11 @@  static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 out_stop:
 	del_timer_sync(&ip->ioc3_timer);
 	if (ip->rxr)
-		dma_direct_free_pages(ip->dma_dev, RX_RING_SIZE, ip->rxr,
-				      ip->rxr_dma, 0);
-	if (ip->txr)
-		dma_direct_free_pages(ip->dma_dev, TX_RING_SIZE, ip->txr,
-				      ip->txr_dma, 0);
+		dma_free_coherent(ip->dma_dev, RX_RING_SIZE, ip->rxr,
+				  ip->rxr_dma);
+	if (ip->tx_ring)
+		dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->tx_ring,
+				  ip->txr_dma);
 out_res:
 	pci_release_regions(pdev);
 out_free:
@@ -1335,10 +1338,8 @@  static void ioc3_remove_one(struct pci_dev *pdev)
 	struct net_device *dev = pci_get_drvdata(pdev);
 	struct ioc3_private *ip = netdev_priv(dev);
 
-	dma_direct_free_pages(ip->dma_dev, RX_RING_SIZE, ip->rxr,
-			      ip->rxr_dma, 0);
-	dma_direct_free_pages(ip->dma_dev, TX_RING_SIZE, ip->txr,
-			      ip->txr_dma, 0);
+	dma_free_coherent(ip->dma_dev, RX_RING_SIZE, ip->rxr, ip->rxr_dma);
+	dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->tx_ring, ip->txr_dma);
 
 	unregister_netdev(dev);
 	del_timer_sync(&ip->ioc3_timer);