Thread (7 messages) 7 messages, 3 authors, 2018-06-05

Re: suspicius csum initialization in vmxnet3_rx_csum

From: Neil Horman <nhorman@tuxdriver.com>
Date: 2018-05-31 23:32:44

Possibly related (same subject, not in this thread)

On Thu, May 31, 2018 at 11:02:34AM -0700, Ronak Doshi wrote:
On Wed, 30 May 2018, Paolo Abeni wrote:
quoted
Hi,

On Thu, 2018-05-24 at 21:48 +0000, Guolin Yang wrote:
quoted
Yes, that code  is not correct, we should fix that code
Did you have any chance to address the issue and/or to give a more in-
deepth look to the change proposed in my initial email?
 
Hi Paolo,

Can you provide the esx build you are using? It can be found using 
"vmware -vl" on ESX host.

Did you try your proposed fix and did it work? Are you sure the packet
hits the below if block and not the else block? I still don't think the
ICMP packet will go through the below if block.

   if (gdesc->rcd.csum) {
	skb->csum = htons(gdesc->rcd.csum);
	skb->ip_summed = CHECKSUM_PARTIAL;
   } else {
	skb_checksum_none_assert(skb);
   }

The vmxnet3 emulation does not calculate rcd.csum for ICMP packet and
hence should go through the else block i.e. checksum none.
What packet types will rcd.csum be set for?
Neil
Thanks,
Ronak
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