Re: About structure sk

On Mon, Jun 6, 2016 at 3:10 AM, Corcodel Marian <asd@marian1000.go.ro> wrote:

On 06.06.2016 12:59, Corcodel Marian wrote:

Hi
Why sk_buff have memory allocated on hardware drivers on majority nic drivers?

This seems like an appropriate question for netdev mailing list:

http://vger.kernel.org/vger-lists.html#netdev

(Tip: explain in more detail what you think is wrong with "rx mode" and someone should be polite enough to point out why it works. Offhand, I don't quite understand what you are trying to point out.)

cheers,

grant

This is wrong on rx mode look like:

struct sk_buff *skb;
struct device *d = &tp->pci_dev->dev;

data = ""> dma_sync_single_for_cpu(d, addr, pkt_size, DMA_FROM_DEVICE);
prefetch(data);
skb = netdev_alloc_skb_ip_align(tp->dev, pkt_size);
if (skb)
memcpy(skb->data, data, pkt_size);
dma_sync_single_for_device(d, addr, pkt_size, DMA_FROM_DEVICE);

sk_buff is allocated on place tx mode
and on start_xmit no need to keep sk_buff on hardware structure because any info is extracted from
next level of driver.

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Re: About structure sk_buff