[PATCH] net/fealnx: switch from 'pci_' to 'dma_' API

From: Christophe JAILLET
Date: Sat Jul 18 2020 - 07:03:52 EST

The wrappers in include/linux/pci-dma-compat.h should go away.

The patch has been generated with the coccinelle script below and has been
hand modified to replace GFP_ with a correct flag.
It has been compile tested.

When memory is allocated, GFP_KERNEL can be used because it is called from
the probe function (i.e. 'fealnx_init_one()') and no lock is taken.

@@
@@
- PCI_DMA_BIDIRECTIONAL
+ DMA_BIDIRECTIONAL

@@
@@
- PCI_DMA_TODEVICE
+ DMA_TO_DEVICE

@@
@@
- PCI_DMA_FROMDEVICE
+ DMA_FROM_DEVICE

@@
@@
- PCI_DMA_NONE
+ DMA_NONE

@@
expression e1, e2, e3;
@@
- pci_alloc_consistent(e1, e2, e3)
+ dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3;
@@
- pci_zalloc_consistent(e1, e2, e3)
+ dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3, e4;
@@
- pci_free_consistent(e1, e2, e3, e4)
+ dma_free_coherent(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_map_single(e1, e2, e3, e4)
+ dma_map_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_single(e1, e2, e3, e4)
+ dma_unmap_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4, e5;
@@
- pci_map_page(e1, e2, e3, e4, e5)
+ dma_map_page(&e1->dev, e2, e3, e4, e5)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_page(e1, e2, e3, e4)
+ dma_unmap_page(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_map_sg(e1, e2, e3, e4)
+ dma_map_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_sg(e1, e2, e3, e4)
+ dma_unmap_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_single_for_cpu(e1, e2, e3, e4)
+ dma_sync_single_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_single_for_device(e1, e2, e3, e4)
+ dma_sync_single_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_sg_for_cpu(e1, e2, e3, e4)
+ dma_sync_sg_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_sg_for_device(e1, e2, e3, e4)
+ dma_sync_sg_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2;
@@
- pci_dma_mapping_error(e1, e2)
+ dma_mapping_error(&e1->dev, e2)

@@
expression e1, e2;
@@
- pci_set_dma_mask(e1, e2)
+ dma_set_mask(&e1->dev, e2)

@@
expression e1, e2;
@@
- pci_set_consistent_dma_mask(e1, e2)
+ dma_set_coherent_mask(&e1->dev, e2)

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
drivers/net/ethernet/fealnx.c | 91 ++++++++++++++++++++---------------
1 file changed, 53 insertions(+), 38 deletions(-)

diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c
index 73e896a7d8fd..c696651dd735 100644
--- a/drivers/net/ethernet/fealnx.c
+++ b/drivers/net/ethernet/fealnx.c
@@ -543,7 +543,8 @@ static int fealnx_init_one(struct pci_dev *pdev,
np->mii.phy_id_mask = 0x1f;
np->mii.reg_num_mask = 0x1f;

- ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
+ ring_space = dma_alloc_coherent(&pdev->dev, RX_TOTAL_SIZE, &ring_dma,
+ GFP_KERNEL);
if (!ring_space) {
err = -ENOMEM;
goto err_out_free_dev;
@@ -551,7 +552,8 @@ static int fealnx_init_one(struct pci_dev *pdev,
np->rx_ring = ring_space;
np->rx_ring_dma = ring_dma;

- ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
+ ring_space = dma_alloc_coherent(&pdev->dev, TX_TOTAL_SIZE, &ring_dma,
+ GFP_KERNEL);
if (!ring_space) {
err = -ENOMEM;
goto err_out_free_rx;
@@ -656,9 +658,11 @@ static int fealnx_init_one(struct pci_dev *pdev,
return 0;

err_out_free_tx:
- pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
+ dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, np->tx_ring,
+ np->tx_ring_dma);
err_out_free_rx:
- pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
+ dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, np->rx_ring,
+ np->rx_ring_dma);
err_out_free_dev:
free_netdev(dev);
err_out_unmap:
@@ -676,10 +680,10 @@ static void fealnx_remove_one(struct pci_dev *pdev)
if (dev) {
struct netdev_private *np = netdev_priv(dev);

- pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring,
- np->tx_ring_dma);
- pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring,
- np->rx_ring_dma);
+ dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, np->tx_ring,
+ np->tx_ring_dma);
+ dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, np->rx_ring,
+ np->rx_ring_dma);
unregister_netdev(dev);
pci_iounmap(pdev, np->mem);
free_netdev(dev);
@@ -1056,8 +1060,10 @@ static void allocate_rx_buffers(struct net_device *dev)
np->lack_rxbuf = np->lack_rxbuf->next_desc_logical;

np->lack_rxbuf->skbuff = skb;
- np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->data,
- np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+ np->lack_rxbuf->buffer = dma_map_single(&np->pci_dev->dev,
+ skb->data,
+ np->rx_buf_sz,
+ DMA_FROM_DEVICE);
np->lack_rxbuf->status = RXOWN;
++np->really_rx_count;
}
@@ -1251,8 +1257,10 @@ static void init_ring(struct net_device *dev)

++np->really_rx_count;
np->rx_ring[i].skbuff = skb;
- np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->data,
- np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+ np->rx_ring[i].buffer = dma_map_single(&np->pci_dev->dev,
+ skb->data,
+ np->rx_buf_sz,
+ DMA_FROM_DEVICE);
np->rx_ring[i].status = RXOWN;
np->rx_ring[i].control |= RXIC;
}
@@ -1290,8 +1298,8 @@ static netdev_tx_t start_tx(struct sk_buff *skb, struct net_device *dev)
#define one_buffer
#define BPT 1022
#if defined(one_buffer)
- np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
- skb->len, PCI_DMA_TODEVICE);
+ np->cur_tx_copy->buffer = dma_map_single(&np->pci_dev->dev, skb->data,
+ skb->len, DMA_TO_DEVICE);
np->cur_tx_copy->control = TXIC | TXLD | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (skb->len << TBSShift); /* buffer size */
@@ -1306,8 +1314,9 @@ static netdev_tx_t start_tx(struct sk_buff *skb, struct net_device *dev)
struct fealnx_desc *next;

/* for the first descriptor */
- np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
- BPT, PCI_DMA_TODEVICE);
+ np->cur_tx_copy->buffer = dma_map_single(&np->pci_dev->dev,
+ skb->data, BPT,
+ DMA_TO_DEVICE);
np->cur_tx_copy->control = TXIC | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (BPT << TBSShift); /* buffer size */
@@ -1321,8 +1330,9 @@ static netdev_tx_t start_tx(struct sk_buff *skb, struct net_device *dev)
// 89/12/29 add,
if (np->pci_dev->device == 0x891)
np->cur_tx_copy->control |= ETIControl | RetryTxLC;
- next->buffer = pci_map_single(ep->pci_dev, skb->data + BPT,
- skb->len - BPT, PCI_DMA_TODEVICE);
+ next->buffer = dma_map_single(&ep->pci_dev->dev,
+ skb->data + BPT, skb->len - BPT,
+ DMA_TO_DEVICE);

next->status = TXOWN;
np->cur_tx_copy->status = TXOWN;
@@ -1330,8 +1340,9 @@ static netdev_tx_t start_tx(struct sk_buff *skb, struct net_device *dev)
np->cur_tx_copy = next->next_desc_logical;
np->free_tx_count -= 2;
} else {
- np->cur_tx_copy->buffer = pci_map_single(np->pci_dev, skb->data,
- skb->len, PCI_DMA_TODEVICE);
+ np->cur_tx_copy->buffer = dma_map_single(&np->pci_dev->dev,
+ skb->data, skb->len,
+ DMA_TO_DEVICE);
np->cur_tx_copy->control = TXIC | TXLD | TXFD | CRCEnable | PADEnable;
np->cur_tx_copy->control |= (skb->len << PKTSShift); /* pkt size */
np->cur_tx_copy->control |= (skb->len << TBSShift); /* buffer size */
@@ -1371,8 +1382,8 @@ static void reset_tx_descriptors(struct net_device *dev)
for (i = 0; i < TX_RING_SIZE; i++) {
cur = &np->tx_ring[i];
if (cur->skbuff) {
- pci_unmap_single(np->pci_dev, cur->buffer,
- cur->skbuff->len, PCI_DMA_TODEVICE);
+ dma_unmap_single(&np->pci_dev->dev, cur->buffer,
+ cur->skbuff->len, DMA_TO_DEVICE);
dev_kfree_skb_any(cur->skbuff);
cur->skbuff = NULL;
}
@@ -1515,8 +1526,10 @@ static irqreturn_t intr_handler(int irq, void *dev_instance)
}

/* Free the original skb. */
- pci_unmap_single(np->pci_dev, np->cur_tx->buffer,
- np->cur_tx->skbuff->len, PCI_DMA_TODEVICE);
+ dma_unmap_single(&np->pci_dev->dev,
+ np->cur_tx->buffer,
+ np->cur_tx->skbuff->len,
+ DMA_TO_DEVICE);
dev_consume_skb_irq(np->cur_tx->skbuff);
np->cur_tx->skbuff = NULL;
--np->really_tx_count;
@@ -1682,10 +1695,10 @@ static int netdev_rx(struct net_device *dev)
if (pkt_len < rx_copybreak &&
(skb = netdev_alloc_skb(dev, pkt_len + 2)) != NULL) {
skb_reserve(skb, 2); /* 16 byte align the IP header */
- pci_dma_sync_single_for_cpu(np->pci_dev,
- np->cur_rx->buffer,
- np->rx_buf_sz,
- PCI_DMA_FROMDEVICE);
+ dma_sync_single_for_cpu(&np->pci_dev->dev,
+ np->cur_rx->buffer,
+ np->rx_buf_sz,
+ DMA_FROM_DEVICE);
/* Call copy + cksum if available. */

#if ! defined(__alpha__)
@@ -1696,15 +1709,15 @@ static int netdev_rx(struct net_device *dev)
skb_put_data(skb, np->cur_rx->skbuff->data,
pkt_len);
#endif
- pci_dma_sync_single_for_device(np->pci_dev,
- np->cur_rx->buffer,
- np->rx_buf_sz,
- PCI_DMA_FROMDEVICE);
+ dma_sync_single_for_device(&np->pci_dev->dev,
+ np->cur_rx->buffer,
+ np->rx_buf_sz,
+ DMA_FROM_DEVICE);
} else {
- pci_unmap_single(np->pci_dev,
+ dma_unmap_single(&np->pci_dev->dev,
np->cur_rx->buffer,
np->rx_buf_sz,
- PCI_DMA_FROMDEVICE);
+ DMA_FROM_DEVICE);
skb_put(skb = np->cur_rx->skbuff, pkt_len);
np->cur_rx->skbuff = NULL;
--np->really_rx_count;
@@ -1896,8 +1909,9 @@ static int netdev_close(struct net_device *dev)

np->rx_ring[i].status = 0;
if (skb) {
- pci_unmap_single(np->pci_dev, np->rx_ring[i].buffer,
- np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+ dma_unmap_single(&np->pci_dev->dev,
+ np->rx_ring[i].buffer, np->rx_buf_sz,
+ DMA_FROM_DEVICE);
dev_kfree_skb(skb);
np->rx_ring[i].skbuff = NULL;
}
@@ -1907,8 +1921,9 @@ static int netdev_close(struct net_device *dev)
struct sk_buff *skb = np->tx_ring[i].skbuff;

if (skb) {
- pci_unmap_single(np->pci_dev, np->tx_ring[i].buffer,
- skb->len, PCI_DMA_TODEVICE);
+ dma_unmap_single(&np->pci_dev->dev,
+ np->tx_ring[i].buffer, skb->len,
+ DMA_TO_DEVICE);
dev_kfree_skb(skb);
np->tx_ring[i].skbuff = NULL;
}
--
2.25.1