Evgeniy Polyakov wrote:
Shared info is freed when there are no skbs referring to the shared info in question. Skb holds all pages in shared info in the fraglist array, so when it is about to be freed, it means that network stack does not use it (particulary it will putpage every page in fraglist). Usually there are two skbs in the network stack per packet in TCP (allocated at once though via fastclone mechanims): one is provided to the device (and will be freed there) and another one is placed into retransmit queue, where it will be located and freed when ack has been received. There may be another layers which may clone skb, but its shared info structure (shared between the clones) will only be freed when all users freed appropriate cloned skbs.
I see. One more question: how would I go about submitting some data with the callback attached to it?
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