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Commit 065df159 authored by Govindarajulu Varadarajan's avatar Govindarajulu Varadarajan Committed by David S. Miller
Browse files

enic: check dma_mapping_error 



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: default avatarJan Stancek <jstancek@redhat.com>
Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5e32066d

drivers/net/ethernet/cisco/enic/enic.h

+12 −0
Original line number Diff line number Diff line
@@ -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);

drivers/net/ethernet/cisco/enic/enic_main.c

+94 −58
Original line number Diff line number Diff line
@@ -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),

		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;
@@ -454,12 +468,11 @@ 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,

		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;
@@ -467,7 +480,7 @@ static inline void enic_queue_wq_skb_tso(struct enic *enic, 
	}



	if (eop)

		return;

		return 0;



	/* Queue WQ_ENET_MAX_DESC_LEN length descriptors

	 * for additional data fragments
@@ -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,

			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? */

						 (len == frag_len_left),/*EOP*/

						loopback);

			frag_len_left -= len;

			offset += len;

		}

	}



	return 0;

}



static inline void enic_queue_wq_skb(struct enic *enic,
@@ -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 */
@@ -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 */
@@ -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);