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Date: Mon, 16 Apr 2012 14:07:59 +0800 From: Jason Wang <jasowang@...hat.com> To: netdev@...r.kernel.org, xma@...ibm.com, davem@...emloft.net, linux-kernel@...r.kernel.org, mst@...hat.com Cc: ebiederm@...ssion.com Subject: [PATCH 2/6] macvtap: zerocopy: fix truesize underestimation As the skb fragment were pinned/built from user pages, we should account the page instead of length for truesize. Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/net/macvtap.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index bd4a70d..7cb2684 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -519,6 +519,7 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, struct page *page[MAX_SKB_FRAGS]; int num_pages; unsigned long base; + unsigned long truesize; len = from->iov_len - offset; if (!len) { @@ -533,10 +534,11 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, (num_pages > MAX_SKB_FRAGS - skb_shinfo(skb)->nr_frags)) /* put_page is in skb free */ return -EFAULT; + truesize = size * PAGE_SIZE; skb->data_len += len; skb->len += len; - skb->truesize += len; - atomic_add(len, &skb->sk->sk_wmem_alloc); + skb->truesize += truesize; + atomic_add(truesize, &skb->sk->sk_wmem_alloc); while (len) { int off = base & ~PAGE_MASK; int size = min_t(int, len, PAGE_SIZE - off); -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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