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[PATCH] powerpc/cell spidernet zlen min packet length

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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>
This commit is contained in:
Linas Vepstas 2006-10-10 16:01:00 -05:00 committed by Jeff Garzik
parent c3fee4c559
commit 808999c9a4
1 changed files with 14 additions and 4 deletions
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18
drivers/net/spider_net.c
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@ -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);
}