Alan Cox <[email protected]> :
[...]
> You seem to have a leak, which actually isn't suprising
>
> rtl8169_xmit_frags allocates a set of maps for a fragmented packet
>
> rtl8169_start_xmit allocates a buffer
>
> When we finish the transit we free the main buffer (always using skb->len
> when sometimes its skb->headlne. We don't seem to free the fragment
> buffers at all.
> Looks like the unmap path for fragmented packets is broken with any kind
> of iommu
Are you referring to the pci_unmap part ?
There is a 1:1 correspondance between a Tx descriptor entry and
{an unfragmented skb or a fragment of a skb}. Afaiks rtl8169_unmap_tx_skb()
is issued for each Tx descriptor entry, be it after a Tx completion irq or
a general Tx ring cleanup.
I'll read it again after some sleep but the leak does not seem clear to me.
--
Ueimor
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