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jme: Fix DMA unmap warning 

The jme driver forgot to check the return status from pci_map_page in its tx
path, causing a dma api warning on unmap.  Easy fix, just do the check and
augment the tx path to tell the stack that the driver is busy so we re-queue the
frame.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Guo-Fu Tseng <cooldavid@cooldavid.org>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2014-05-05 14:51:47 -04:00 committed by David S. Miller
parent d32aebfd64
commit 76a691d0ab
1 changed files with 47 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/net/ethernet/jme.c
View File

@ -1988,7 +1988,7 @@ jme_alloc_txdesc(struct jme_adapter *jme,
return idx;
}
static void
static int
jme_fill_tx_map(struct pci_dev *pdev,
struct txdesc *txdesc,
struct jme_buffer_info *txbi,
@ -2005,6 +2005,9 @@ jme_fill_tx_map(struct pci_dev *pdev,
len,
PCI_DMA_TODEVICE);
if (unlikely(pci_dma_mapping_error(pdev, dmaaddr)))
return -EINVAL;
pci_dma_sync_single_for_device(pdev,
dmaaddr,
len,
@ -2021,9 +2024,30 @@ jme_fill_tx_map(struct pci_dev *pdev,
txbi->mapping = dmaaddr;
txbi->len = len;
return 0;
}
static void
static void jme_drop_tx_map(struct jme_adapter *jme, int startidx, int endidx)
{
struct jme_ring *txring = &(jme->txring[0]);
struct jme_buffer_info *txbi = txring->bufinf, *ctxbi;
int mask = jme->tx_ring_mask;
int j;
for (j = startidx ; j < endidx ; ++j) {
ctxbi = txbi + ((startidx + j + 2) & (mask));
pci_unmap_page(jme->pdev,
ctxbi->mapping,
ctxbi->len,
PCI_DMA_TODEVICE);
ctxbi->mapping = 0;
ctxbi->len = 0;
}
}
static int
jme_map_tx_skb(struct jme_adapter *jme, struct sk_buff *skb, int idx)
{
struct jme_ring *txring = &(jme->txring[0]);
@ -2034,25 +2058,37 @@ jme_map_tx_skb(struct jme_adapter *jme, struct sk_buff *skb, int idx)
int mask = jme->tx_ring_mask;
const struct skb_frag_struct *frag;
u32 len;
int ret = 0;
for (i = 0 ; i < nr_frags ; ++i) {
frag = &skb_shinfo(skb)->frags[i];
ctxdesc = txdesc + ((idx + i + 2) & (mask));
ctxbi = txbi + ((idx + i + 2) & (mask));
jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi,
ret = jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi,
skb_frag_page(frag),
frag->page_offset, skb_frag_size(frag), hidma);
if (ret) {
jme_drop_tx_map(jme, idx, idx+i);
goto out;
}
}
len = skb_is_nonlinear(skb) ? skb_headlen(skb) : skb->len;
ctxdesc = txdesc + ((idx + 1) & (mask));
ctxbi = txbi + ((idx + 1) & (mask));
jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi, virt_to_page(skb->data),
ret = jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi, virt_to_page(skb->data),
offset_in_page(skb->data), len, hidma);
if (ret)
jme_drop_tx_map(jme, idx, idx+i);
out:
return ret;
}
static int
jme_tx_tso(struct sk_buff *skb, __le16 *mss, u8 *flags)
{
@ -2131,6 +2167,7 @@ jme_fill_tx_desc(struct jme_adapter *jme, struct sk_buff *skb, int idx)
struct txdesc *txdesc;
struct jme_buffer_info *txbi;
u8 flags;
int ret = 0;
txdesc = (struct txdesc *)txring->desc + idx;
txbi = txring->bufinf + idx;
@ -2155,7 +2192,10 @@ jme_fill_tx_desc(struct jme_adapter *jme, struct sk_buff *skb, int idx)
if (jme_tx_tso(skb, &txdesc->desc1.mss, &flags))
jme_tx_csum(jme, skb, &flags);
jme_tx_vlan(skb, &txdesc->desc1.vlan, &flags);
jme_map_tx_skb(jme, skb, idx);
ret = jme_map_tx_skb(jme, skb, idx);
if (ret)
return ret;
txdesc->desc1.flags = flags;
/*
* Set tx buffer info after telling NIC to send
@ -2228,7 +2268,8 @@ jme_start_xmit(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_BUSY;
}
jme_fill_tx_desc(jme, skb, idx);
if (jme_fill_tx_desc(jme, skb, idx))
return NETDEV_TX_BUSY;
jwrite32(jme, JME_TXCS, jme->reg_txcs |
TXCS_SELECT_QUEUE0 |