[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/netfront: handle compound page fragments on transmit
On Wed, 2012-11-21 at 02:52 +0000, ANNIE LI wrote: > > On 2012-11-20 19:40, Ian Campbell wrote: > > An SKB paged fragment can consist of a compound page with order> 0. > > However the netchannel protocol deals only in PAGE_SIZE frames. > > > > Handle this in xennet_make_frags by iterating over the frames which > > make up the page. > > > > This is the netfront equivalent to 6a8ed462f16b for netback. > > > > Signed-off-by: Ian Campbell<ian.campbell@xxxxxxxxxx> > > Cc: netdev@xxxxxxxxxxxxxxx > > Cc: xen-devel@xxxxxxxxxxxxx > > Cc: Eric Dumazet<edumazet@xxxxxxxxxx> > > Cc: Konrad Rzeszutek Wilk<konrad@xxxxxxxxxx> > > Cc: ANNIE LI<annie.li@xxxxxxxxxx> > > Cc: Sander Eikelenboom<linux@xxxxxxxxxxxxxx> > > Cc: Stefan Bader<stefan.bader@xxxxxxxxxxxxx> > > --- > > drivers/net/xen-netfront.c | 58 > > +++++++++++++++++++++++++++++++++---------- > > 1 files changed, 44 insertions(+), 14 deletions(-) > > > > diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c > > index caa0110..a12b99a 100644 > > --- a/drivers/net/xen-netfront.c > > +++ b/drivers/net/xen-netfront.c > > @@ -452,24 +452,54 @@ static void xennet_make_frags(struct sk_buff *skb, > > struct net_device *dev, > > /* Grant backend access to each skb fragment page. */ > > for (i = 0; i< frags; i++) { > > skb_frag_t *frag = skb_shinfo(skb)->frags + i; > > + struct page *page = skb_frag_page(frag); > > + unsigned long size = skb_frag_size(frag); > > + unsigned long offset = frag->page_offset; > > There are following definitions at the beginning of xennet_make_frags, > > unsigned int offset = offset_in_page(data); > unsigned int len = skb_headlen(skb); So they are, well spotted. > Is it better to reuse those definitions, and not define new size and > offset again in this for loop? And unsigned int is enough here, right? Yes to both. > [...] > Over 80 characters? [...] > Over 80 characters? Both fixed, thanks for your review. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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