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ethernet: atl1: Add missing DMA mapping error checks and count errors

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[ Upstream commit d72411d20905180cdc452c553be17481b24463d2 ]

The `dma_map_XXX()` functions can fail and must be checked using
`dma_mapping_error()`.  This patch adds proper error handling for all
DMA mapping calls.

In `atl1_alloc_rx_buffers()`, if DMA mapping fails, the buffer is
deallocated and marked accordingly.

In `atl1_tx_map()`, previously mapped buffers are unmapped and the
packet is dropped on failure.

If `atl1_xmit_frame()` drops the packet, increment the tx_error counter.

Fixes: f3cc28c797 ("Add Attansic L1 ethernet driver.")
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Link: https://patch.msgid.link/20250625141629.114984-2-fourier.thomas@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Fourier 2025-07-07 15:36:37 -04:00 • committed by Greg Kroah-Hartman
commit 568a6afd1d
1 changed files with 56 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

78
drivers/net/ethernet/atheros/atlx/atl1.c
View file

@ -1863,14 +1863,21 @@ static u16 atl1_alloc_rx_buffers(struct atl1_adapter *adapter)
break;
}
buffer_info->alloced = 1;
buffer_info->skb = skb;
buffer_info->length = (u16) adapter->rx_buffer_len;
page = virt_to_page(skb->data);
offset = offset_in_page(skb->data);
buffer_info->dma = pci_map_page(pdev, page, offset,
adapter->rx_buffer_len,
PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(pdev, buffer_info->dma)) {
kfree_skb(skb);
adapter->soft_stats.rx_dropped++;
break;
}
buffer_info->alloced = 1;
buffer_info->skb = skb;
buffer_info->length = (u16)adapter->rx_buffer_len;
rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
rfd_desc->buf_len = cpu_to_le16(adapter->rx_buffer_len);
rfd_desc->coalese = 0;
@ -2182,8 +2189,8 @@ static int atl1_tx_csum(struct atl1_adapter *adapter, struct sk_buff *skb,
return 0;
}
static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
struct tx_packet_desc *ptpd)
static bool atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
struct tx_packet_desc *ptpd)
{
struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
struct atl1_buffer *buffer_info;
@ -2193,6 +2200,7 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
unsigned int nr_frags;
unsigned int f;
int retval;
u16 first_mapped;
u16 next_to_use;
u16 data_len;
u8 hdr_len;
@ -2200,6 +2208,7 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
buf_len -= skb->data_len;
nr_frags = skb_shinfo(skb)->nr_frags;
next_to_use = atomic_read(&tpd_ring->next_to_use);
first_mapped = next_to_use;
buffer_info = &tpd_ring->buffer_info[next_to_use];
BUG_ON(buffer_info->skb);
/* put skb in last TPD */
@ -2215,6 +2224,8 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
buffer_info->dma = pci_map_page(adapter->pdev, page,
offset, hdr_len,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(adapter->pdev, buffer_info->dma))
goto dma_err;
if (++next_to_use == tpd_ring->count)
next_to_use = 0;
@ -2240,6 +2251,9 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
buffer_info->dma = pci_map_page(adapter->pdev,
page, offset, buffer_info->length,
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(adapter->pdev,
buffer_info->dma))
goto dma_err;
if (++next_to_use == tpd_ring->count)
next_to_use = 0;
}
@ -2251,6 +2265,8 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
offset = offset_in_page(skb->data);
buffer_info->dma = pci_map_page(adapter->pdev, page,
offset, buf_len, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(adapter->pdev, buffer_info->dma))
goto dma_err;
if (++next_to_use == tpd_ring->count)
next_to_use = 0;
}
@ -2274,6 +2290,9 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
frag, i * ATL1_MAX_TX_BUF_LEN,
buffer_info->length, DMA_TO_DEVICE);
if (dma_mapping_error(&adapter->pdev->dev,
buffer_info->dma))
goto dma_err;
if (++next_to_use == tpd_ring->count)
next_to_use = 0;
@ -2282,6 +2301,22 @@ static void atl1_tx_map(struct atl1_adapter *adapter, struct sk_buff *skb,
/* last tpd's buffer-info */
buffer_info->skb = skb;
return true;
dma_err:
while (first_mapped != next_to_use) {
buffer_info = &tpd_ring->buffer_info[first_mapped];
pci_unmap_page(adapter->pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_TODEVICE);
buffer_info->dma = 0;
if (++first_mapped == tpd_ring->count)
first_mapped = 0;
}
return false;
}
static void atl1_tx_queue(struct atl1_adapter *adapter, u16 count,
@ -2352,10 +2387,8 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
len = skb_headlen(skb);
if (unlikely(skb->len <= 0)) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
if (unlikely(skb->len <= 0))
goto drop_packet;
nr_frags = skb_shinfo(skb)->nr_frags;
for (f = 0; f < nr_frags; f++) {
@ -2369,10 +2402,8 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
if (skb->protocol == htons(ETH_P_IP)) {
proto_hdr_len = (skb_transport_offset(skb) +
tcp_hdrlen(skb));
if (unlikely(proto_hdr_len > len)) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
if (unlikely(proto_hdr_len > len))
goto drop_packet;
/* need additional TPD ? */
if (proto_hdr_len != len)
count += (len - proto_hdr_len +
@ -2404,23 +2435,26 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
}
tso = atl1_tso(adapter, skb, ptpd);
if (tso < 0) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
if (tso < 0)
goto drop_packet;
if (!tso) {
ret_val = atl1_tx_csum(adapter, skb, ptpd);
if (ret_val < 0) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
if (ret_val < 0)
goto drop_packet;
}
atl1_tx_map(adapter, skb, ptpd);
if (!atl1_tx_map(adapter, skb, ptpd))
goto drop_packet;
atl1_tx_queue(adapter, count, ptpd);
atl1_update_mailbox(adapter);
return NETDEV_TX_OK;
drop_packet:
adapter->soft_stats.tx_errors++;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
static int atl1_rings_clean(struct napi_struct *napi, int budget)