Le jeudi 04 novembre 2010 à 17:05 +0800, [email protected] a écrit :
> From: Xin Xiaohui <[email protected]>
>
> If buffer is external, then use the callback to destruct
> buffers.
>
> Signed-off-by: Xin Xiaohui <[email protected]>
> Signed-off-by: Zhao Yu <[email protected]>
> Reviewed-by: Jeff Dike <[email protected]>
> ---
> net/core/skbuff.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index c83b421..5e6d69c 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -210,6 +210,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t
> gfp_mask,
>
> /* make sure we initialize shinfo sequentially */
> shinfo = skb_shinfo(skb);
> + shinfo->destructor_arg = NULL;
Hmm, I suggest you read the comment two lines above.
If destructor_arg is now cleared each time we allocate a new skb, then,
please move it before dataref in shinfo structure, so that the following
memset() does the job efficiently...
> memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
> atomic_set(&shinfo->dataref, 1);
>
> @@ -343,6 +344,13 @@ static void skb_release_data(struct sk_buff *skb)
> if (skb_has_frags(skb))
> skb_drop_fraglist(skb);
>
> + if (skb->dev && dev_is_mpassthru(skb->dev)) {
> + struct skb_ext_page *ext_page =
> + skb_shinfo(skb)->destructor_arg;
> + if (ext_page && ext_page->dtor)
> + ext_page->dtor(ext_page);
> + }
> +
> kfree(skb->head);
> }
> }
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