From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Miller <davem@davemloft.net>
Cc: ian.campbell@citrix.com, netdev@vger.kernel.org, eric.dumazet@gmail.com
Subject: Re: [PATCH 7/9] net: add skb_orphan_frags to copy aside frags with destructors
Date: Sun, 6 May 2012 20:01:56 +0300 [thread overview]
Message-ID: <20120506170156.GA30827@redhat.com> (raw)
In-Reply-To: <20120504.025433.1474691040952890731.davem@davemloft.net>
On Fri, May 04, 2012 at 02:54:33AM -0400, David Miller wrote:
> From: "Michael S. Tsirkin" <mst@redhat.com>
> Date: Fri, 4 May 2012 00:10:24 +0300
>
> > Hmm we orphan skbs when we loop them back so how about reusing the
> > skb->destructor for this?
>
> That's one possibility.
>
> But I fear we're about to toss Ian into yet another rabbit hole. :-)
>
> Let's try to converge on something quickly as I think integration of
> his work has been delayed enough as-is.
OK I tried doing this and I recalled why we
do the copy with ubufs before clone:
the problem is that shinfo is shared between skbs,
so modifying frags like skb_orphan_frags does is racy.
Stuck for now.
So I have a question: how about reusing the TX_DEV_ZEROCOPY
machinery for this, instead of frag destructors?
Thanks,
--
MST
next prev parent reply other threads:[~2012-05-06 18:20 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-03 14:55 [PATCH v5 0/9] skb paged fragment destructors Ian Campbell
2012-05-03 14:56 ` [PATCH 1/9] net: add and use SKB_ALLOCSIZE Ian Campbell
2012-05-03 14:56 ` [PATCH 2/9] net: Use SKB_WITH_OVERHEAD in build_skb Ian Campbell
2012-05-03 14:56 ` [PATCH 3/9] chelsio: use SKB_WITH_OVERHEAD Ian Campbell
2012-05-03 14:56 ` [PATCH 4/9] skb: add skb_shinfo_init and use for both alloc_skb, build_skb and skb_recycle Ian Campbell
2012-05-03 14:56 ` [PATCH 5/9] net: pad skb data and shinfo as a whole rather than individually Ian Campbell
2012-05-03 14:56 ` [PATCH 6/9] net: add support for per-paged-fragment destructors Ian Campbell
2012-05-03 14:56 ` [PATCH 7/9] net: add skb_orphan_frags to copy aside frags with destructors Ian Campbell
2012-05-03 15:41 ` Michael S. Tsirkin
2012-05-03 17:55 ` David Miller
2012-05-03 21:10 ` Michael S. Tsirkin
2012-05-04 6:54 ` David Miller
2012-05-04 10:03 ` Michael S. Tsirkin
2012-05-04 10:51 ` Ian Campbell
2012-05-06 17:01 ` Michael S. Tsirkin [this message]
2012-05-06 13:54 ` Michael S. Tsirkin
2012-05-07 10:24 ` Michael S. Tsirkin
2012-05-09 9:36 ` Ian Campbell
2012-05-03 14:56 ` [PATCH 8/9] net: add paged frag destructor support to kernel_sendpage Ian Campbell
2012-05-10 11:48 ` Michael S. Tsirkin
2012-05-03 14:56 ` [PATCH 9/9] sunrpc: use SKB fragment destructors to delay completion until page is released by network stack Ian Campbell
2012-05-10 11:19 ` Michael S. Tsirkin
2012-05-10 11:19 ` Michael S. Tsirkin
2012-05-10 13:26 ` Ian Campbell
2012-05-10 13:26 ` Ian Campbell
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