* [PATCH RFC wpan] net: 6lowpan: fix reserved space for single frames
@ 2018-06-01 15:58 Alexander Aring
2018-06-05 21:17 ` Alexander Aring
0 siblings, 1 reply; 2+ messages in thread
From: Alexander Aring @ 2018-06-01 15:58 UTC (permalink / raw)
To: stefan; +Cc: linux-wpan, kernel, Alexander Aring
This patch fixes patch add handling to take care tail and headroom for
single 6lowpan frames. We need to be sure we have a skb with the right
head and tailroom for single frames. This patch do it by using
skb_copy_expand().
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195059
Signed-off-by: Alexander Aring <aring@mojatatu.com>
---
I hope the refcounting doesn't change here... anyway it also copy skb.
Anyway, it fix something... we can think about perfomance later.
Also I thought the upper layer would allocate the right needed_headroom
and needed_tailroom for me, so I don't need to realloc in transmit.
Maybe this is a bigger issue in the upper layer? I am pretty sure these
extra bytes should be allocated when skb is created according the
net_device which ndo_xmit() will be called from.
I will ask this question to netdev mailinglist..., if no answer then
simple apply this patch @stefan. (If it's looking okay for you).
net/ieee802154/6lowpan/tx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c
index e6ff5128e61a..2d74918431e3 100644
--- a/net/ieee802154/6lowpan/tx.c
+++ b/net/ieee802154/6lowpan/tx.c
@@ -265,7 +265,8 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
/* We must take a copy of the skb before we modify/replace the ipv6
* header as the header could be used elsewhere
*/
- skb = skb_unshare(skb, GFP_ATOMIC);
+ skb = skb_copy_expand(skb, ldev->needed_headroom,
+ ldev->needed_tailroom, GFP_ATOMIC);
if (!skb)
return NET_XMIT_DROP;
--
2.11.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH RFC wpan] net: 6lowpan: fix reserved space for single frames
2018-06-01 15:58 [PATCH RFC wpan] net: 6lowpan: fix reserved space for single frames Alexander Aring
@ 2018-06-05 21:17 ` Alexander Aring
0 siblings, 0 replies; 2+ messages in thread
From: Alexander Aring @ 2018-06-05 21:17 UTC (permalink / raw)
To: stefan; +Cc: linux-wpan, kernel
Hi,
On Fri, Jun 01, 2018 at 11:58:43AM -0400, Alexander Aring wrote:
> This patch fixes patch add handling to take care tail and headroom for
> single 6lowpan frames. We need to be sure we have a skb with the right
> head and tailroom for single frames. This patch do it by using
> skb_copy_expand().
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195059
> Signed-off-by: Alexander Aring <aring@mojatatu.com>
drop this, I found the bug in IPv6 (I suppose).
I will do a proper patch with additional Reported-by tag to David.
- Alex
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