Wolfgang Grandegger wrote:
> ...
> I was rigt, The problem is with "frags" in rt_3c59.c":
Oh, yes, our old friend again. :)
>
> for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
> skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
>
> vp->tx_ring[entry].frag[i+1].addr =
> // *** RTnet: page mapping correct? Or is this code never used?
> cpu_to_le32(pci_map_single(vp->pdev,
>
> (void*)page_address(frag->page) +
> frag->page_offset,
> frag->size, PCI_DMA_TODEVICE));
>
> What memory is actually used for the RTnet skb's?
>
The usage of skb_shinfo is illegal with real-time skbs (rtskbs). It
assumes that there is some skb_shared_info struct at the end of the
payload buffer. But rtskbs are not shared as normal skbs between several
users. Thus, the assumption for RTnet should be that always only a
single fragment exists and that the rtskb at hand already describes it.
But I don't know yet how to apply this to the 3c59x code.
Jan
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