> -----Original Message-----
> From: Yigit, Ferruh <[email protected]>
> Sent: Tuesday, May 12, 2020 12:29 AM
> To: Xu, Ting <[email protected]>; [email protected]
> Cc: Lu, Wenzhuo <[email protected]>; Xing, Beilei
> <[email protected]>; Iremonger, Bernard
> <[email protected]>; [email protected]; Andrew Rybchenko
> <[email protected]>; Thomas Monjalon <[email protected]>
> Subject: Re: [dpdk-dev] [PATCH v1] app/testpmd: fix DCB set failure in
> FreeBSD by clang
>
> On 5/11/2020 11:25 AM, Ting Xu wrote:
> > When set DCB in testpmd by clang, there is a segmentation fault.
> > It is because the local variable rss_conf in get_eth_dcb_conf() is not
> > cleared, so that the pointer member variable rss_key has a random
> > address, which leads to an error in the following processing. This
> > patch initialized the local variable rss_conf to avoid random address.
>
> This is nothing really FreeBSD or clang issue, although it may be reproduced
> that environment, this is a pointer with random value issue. We may drop
> FreeBSD and clang reference to not create confusion.
>
OK, I will modify the commit log.
> >
> > Fixes: b57b66a97ebf ("app/testpmd: support mbuf dynamic flag")
>
> This commit looks unrelated, if not can you please explain why above
> commit causing the issue?
>
This is the bad commit the validation team find for this issue. Honestly
speaking,
I did not find the relation between this commit and the issue either.
> > Cc: [email protected]
> >
> > Signed-off-by: Ting Xu <[email protected]>
> > ---
> > app/test-pmd/testpmd.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > 99bacddbf..1276476ca 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -3408,6 +3408,7 @@ get_eth_dcb_conf(portid_t pid, struct
> rte_eth_conf *eth_conf,
> > int32_t rc;
> > struct rte_eth_rss_conf rss_conf;
> >
> > + memset(&rss_conf, 0, sizeof(struct rte_eth_rss_conf));
>
> The variable is used in the 'else' leg, memset can be moved there, but more
> importantly should this be done in the 'rte_eth_dev_rss_hash_conf_get()' API.
>
> @Andrew, @Thomas,
>
> What do you think 'rte_eth_dev_rss_hash_conf_get()' memset the 'rss_conf'
> param before passing it to the PMD? To prevent issues like above in user
> application.
I will move it to the else leg first in the v2 patch. Wait for more comments.
Thanks!
