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Re: About structure sk_buff

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

This seems like an appropriate question for netdev mailing list:

(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.)


 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);
    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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