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authorLinas Vepstas <linas@austin.ibm.com>2006-10-10 16:01:00 -0500
committerJeff Garzik <jeff@garzik.org>2006-10-11 04:04:25 -0400
commit808999c9a4749dc67c39bf52f712d0c27aa00e67 (patch)
tree7a6f8879857ca81fa36194e6d14e9f66a42ed2eb /drivers/net/spider_net.c
parentc3fee4c55915c42b3278b65c91f9be8cee13426e (diff)
[PATCH] powerpc/cell spidernet zlen min packet length
Polite device drivers pad short packets to 60 bytes, so that mean-spirited users don't accidentally DOS some other OS that can't handle short packets. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Cc: James K Lewis <jklewis@us.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/spider_net.c')
-rw-r--r--drivers/net/spider_net.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 52bf1b2968b..f5f73571a7a 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -648,18 +648,26 @@ spider_net_prepare_tx_descr(struct spider_net_card *card,
{
struct spider_net_descr *descr = card->tx_chain.head;
dma_addr_t buf;
+ int length;
- buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
+ length = skb->len;
+ if (length < ETH_ZLEN) {
+ if (skb_pad(skb, ETH_ZLEN-length))
+ return 0;
+ length = ETH_ZLEN;
+ }
+
+ buf = pci_map_single(card->pdev, skb->data, length, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(buf)) {
if (netif_msg_tx_err(card) && net_ratelimit())
pr_err("could not iommu-map packet (%p, %i). "
- "Dropping packet\n", skb->data, skb->len);
+ "Dropping packet\n", skb->data, length);
card->spider_stats.tx_iommu_map_error++;
return -ENOMEM;
}
descr->buf_addr = buf;
- descr->buf_size = skb->len;
+ descr->buf_size = length;
descr->next_descr_addr = 0;
descr->skb = skb;
descr->data_status = 0;
@@ -693,6 +701,7 @@ spider_net_release_tx_descr(struct spider_net_card *card)
{
struct spider_net_descr *descr = card->tx_chain.tail;
struct sk_buff *skb;
+ unsigned int len;
card->tx_chain.tail = card->tx_chain.tail->next;
descr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
@@ -701,7 +710,8 @@ spider_net_release_tx_descr(struct spider_net_card *card)
skb = descr->skb;
if (!skb)
return;
- pci_unmap_single(card->pdev, descr->buf_addr, skb->len,
+ len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+ pci_unmap_single(card->pdev, descr->buf_addr, len,
PCI_DMA_TODEVICE);
dev_kfree_skb_any(skb);
}