Re: [dpdk-dev] [PATCH 1/5] vmxnet3: Fix VLAN Rx stripping

[Yong Wang <yongwang@vmware.com>]

On 10/22/14, 6:39 AM, "Stephen Hemminger" <stephen@networkplumber.org>
wrote:


>On Mon, 13 Oct 2014 18:42:18 +0000
>Yong Wang <yongwang@vmware.com> wrote:
>
>> Are you referring to the patch as a whole or your comment is about the
>>reset of vlan_tci on the "else" (no vlan tags stripped) path?  I am not
>>sure I get your comments here.  This patch simply fixes a bug on the rx
>>vlan stripping path (where valid vlan_tci stripped is overwritten
>>unconditionally later on the rx path in the original vmxnet3 pmd
>>driver). All the other pmd drivers are doing the same thing in terms of
>>translating descriptor status to rte_mbuf flags for vlan stripping.
>
>I was thinking that there are many fields in a pktmbuf and rather than
>individually
>setting them (like tci). The code should call the common
>rte_pktmbuf_reset before setting
>the fields.  That way when someone adds a field to mbuf they don't have
>to chasing
>through every driver that does it's own initialization.

Currently rte_pktmbuf_reset() is used in rte_pktmbuf_alloc() but looks
like most pmd drivers use rte_rxmbuf_alloc() to replenish rx buffers,
which directly calls __rte_mbuf_raw_alloc
() without calling rte_pktmbuf_reset(). How about we change that in a
separate patch to all pmd drivers so that we can keep their behavior
consistent?