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enic: check dma_mapping_error
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This patch checks for pci_dma_mapping_error() after dma mapping the data.
If the dma mapping fails we remove the previously queued frags and return
NETDEV_TX_OK.

Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Govindarajulu Varadarajan authored and David S. Miller committed Dec 31, 2014
1 parent 5e32066 commit 065df15
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Showing 2 changed files with 106 additions and 58 deletions.
12 changes: 12 additions & 0 deletions drivers/net/ethernet/cisco/enic/enic.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -242,6 +242,18 @@ static inline unsigned int enic_msix_notify_intr(struct enic *enic)
return enic->rq_count + enic->wq_count + 1;
}

static inline int enic_dma_map_check(struct enic *enic, dma_addr_t dma_addr)
{
if (unlikely(pci_dma_mapping_error(enic->pdev, dma_addr))) {
net_warn_ratelimited("%s: PCI dma mapping failed!\n",
enic->netdev->name);

return -ENOMEM;
}

return 0;
}

void enic_reset_addr_lists(struct enic *enic);
int enic_sriov_enabled(struct enic *enic);
int enic_is_valid_vf(struct enic *enic, int vf);
Expand Down
152 changes: 94 additions & 58 deletions drivers/net/ethernet/cisco/enic/enic_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -351,80 +351,94 @@ static irqreturn_t enic_isr_msix_notify(int irq, void *data)
return IRQ_HANDLED;
}

static inline void enic_queue_wq_skb_cont(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
unsigned int len_left, int loopback)
static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, unsigned int len_left,
int loopback)
{
const skb_frag_t *frag;
dma_addr_t dma_addr;

/* Queue additional data fragments */
for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
len_left -= skb_frag_size(frag);
enic_queue_wq_desc_cont(wq, skb,
skb_frag_dma_map(&enic->pdev->dev,
frag, 0, skb_frag_size(frag),
DMA_TO_DEVICE),
skb_frag_size(frag),
(len_left == 0), /* EOP? */
loopback);
dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
skb_frag_size(frag),
DMA_TO_DEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;
enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
(len_left == 0), /* EOP? */
loopback);
}

return 0;
}

static inline void enic_queue_wq_skb_vlan(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
int vlan_tag_insert, unsigned int vlan_tag, int loopback)
static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, int vlan_tag_insert,
unsigned int vlan_tag, int loopback)
{
unsigned int head_len = skb_headlen(skb);
unsigned int len_left = skb->len - head_len;
int eop = (len_left == 0);
dma_addr_t dma_addr;
int err = 0;

dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
PCI_DMA_TODEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;

/* Queue the main skb fragment. The fragments are no larger
* than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
* than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
* per fragment is queued.
*/
enic_queue_wq_desc(wq, skb,
pci_map_single(enic->pdev, skb->data,
head_len, PCI_DMA_TODEVICE),
head_len,
vlan_tag_insert, vlan_tag,
eop, loopback);
enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert,
vlan_tag, eop, loopback);

if (!eop)
enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);

return err;
}

static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
int vlan_tag_insert, unsigned int vlan_tag, int loopback)
static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, int vlan_tag_insert,
unsigned int vlan_tag, int loopback)
{
unsigned int head_len = skb_headlen(skb);
unsigned int len_left = skb->len - head_len;
unsigned int hdr_len = skb_checksum_start_offset(skb);
unsigned int csum_offset = hdr_len + skb->csum_offset;
int eop = (len_left == 0);
dma_addr_t dma_addr;
int err = 0;

dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
PCI_DMA_TODEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;

/* Queue the main skb fragment. The fragments are no larger
* than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
* than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
* per fragment is queued.
*/
enic_queue_wq_desc_csum_l4(wq, skb,
pci_map_single(enic->pdev, skb->data,
head_len, PCI_DMA_TODEVICE),
head_len,
csum_offset,
hdr_len,
vlan_tag_insert, vlan_tag,
eop, loopback);
enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset,
hdr_len, vlan_tag_insert, vlan_tag, eop,
loopback);

if (!eop)
enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);

return err;
}

static inline void enic_queue_wq_skb_tso(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
int vlan_tag_insert, unsigned int vlan_tag, int loopback)
static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, unsigned int mss,
int vlan_tag_insert, unsigned int vlan_tag,
int loopback)
{
unsigned int frag_len_left = skb_headlen(skb);
unsigned int len_left = skb->len - frag_len_left;
Expand Down Expand Up @@ -454,20 +468,19 @@ static inline void enic_queue_wq_skb_tso(struct enic *enic,
*/
while (frag_len_left) {
len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
dma_addr = pci_map_single(enic->pdev, skb->data + offset,
len, PCI_DMA_TODEVICE);
enic_queue_wq_desc_tso(wq, skb,
dma_addr,
len,
mss, hdr_len,
vlan_tag_insert, vlan_tag,
eop && (len == frag_len_left), loopback);
dma_addr = pci_map_single(enic->pdev, skb->data + offset, len,
PCI_DMA_TODEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;
enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
vlan_tag_insert, vlan_tag,
eop && (len == frag_len_left), loopback);
frag_len_left -= len;
offset += len;
}

if (eop)
return;
return 0;

/* Queue WQ_ENET_MAX_DESC_LEN length descriptors
* for additional data fragments
Expand All @@ -483,16 +496,18 @@ static inline void enic_queue_wq_skb_tso(struct enic *enic,
dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
offset, len,
DMA_TO_DEVICE);
enic_queue_wq_desc_cont(wq, skb,
dma_addr,
len,
(len_left == 0) &&
(len == frag_len_left), /* EOP? */
loopback);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;
enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
(len_left == 0) &&
(len == frag_len_left),/*EOP*/
loopback);
frag_len_left -= len;
offset += len;
}
}

return 0;
}

static inline void enic_queue_wq_skb(struct enic *enic,
Expand All @@ -502,6 +517,7 @@ static inline void enic_queue_wq_skb(struct enic *enic,
unsigned int vlan_tag = 0;
int vlan_tag_insert = 0;
int loopback = 0;
int err;

if (vlan_tx_tag_present(skb)) {
/* VLAN tag from trunking driver */
Expand All @@ -513,14 +529,30 @@ static inline void enic_queue_wq_skb(struct enic *enic,
}

if (mss)
enic_queue_wq_skb_tso(enic, wq, skb, mss,
vlan_tag_insert, vlan_tag, loopback);
err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
vlan_tag_insert, vlan_tag,
loopback);
else if (skb->ip_summed == CHECKSUM_PARTIAL)
enic_queue_wq_skb_csum_l4(enic, wq, skb,
vlan_tag_insert, vlan_tag, loopback);
err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
vlan_tag, loopback);
else
enic_queue_wq_skb_vlan(enic, wq, skb,
vlan_tag_insert, vlan_tag, loopback);
err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
vlan_tag, loopback);
if (unlikely(err)) {
struct vnic_wq_buf *buf;

buf = wq->to_use->prev;
/* while not EOP of previous pkt && queue not empty.
* For all non EOP bufs, os_buf is NULL.
*/
while (!buf->os_buf && (buf->next != wq->to_clean)) {
enic_free_wq_buf(wq, buf);
wq->ring.desc_avail++;
buf = buf->prev;
}
wq->to_use = buf->next;
dev_kfree_skb(skb);
}
}

/* netif_tx_lock held, process context with BHs disabled, or BH */
Expand Down Expand Up @@ -950,8 +982,12 @@ static int enic_rq_alloc_buf(struct vnic_rq *rq)
if (!skb)
return -ENOMEM;

dma_addr = pci_map_single(enic->pdev, skb->data,
len, PCI_DMA_FROMDEVICE);
dma_addr = pci_map_single(enic->pdev, skb->data, len,
PCI_DMA_FROMDEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr))) {
dev_kfree_skb(skb);
return -ENOMEM;
}

enic_queue_rq_desc(rq, skb, os_buf_index,
dma_addr, len);
Expand Down

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