Re: [dpdk-dev] issue with ixgbevf speed/duplex introduced with commit 8ef32003772a14c61c70b540e41c259c482c2fb6

[Thomas Monjalon <thomas.monjalon@6wind.com>]

Hi,

Thank you for reporting and explaining the issue.

You have already sent a bug report and a patch for this issue.
Are you sending this email to ask a review and integration of your patch?
I think it should be reviewed by an Intel developer.

Note: it would be good to have the commit reference in the commit log
of your patch.

PS: in such case, it's better to reply to the previous emails

Thanks
-- 
Thomas

2014-11-07 16:36, Roberts, Lee A.:
> I'm seeing an issue with ixgbevf speed/duplex reporting that appears to have been introduced with
> commit 8ef32003772a14c61c70b540e41c259c482c2fb6 (http://www.dpdk.org/browse/dpdk/commit/lib/librte_pmd_ixgbe/ixgbe/ixgbe_vf.c?id=8ef32003772a14c61c70b540e41c259c482c2fb6)
> 
> The issue I'm seeing seems to involve the following code.  If I'm reading this correctly,
> one sets "mac->get_link_status = true" if the port is not OK, where "true" means that one
> still needs to get the link status.  Due to the added test "if (!mac->get_link_status)",
> one branches to the early exit if mac->get_link_status is false---meaning we have already
> obtained the link status---instead of continuing with the analysis in the function body.
> 
> -       if (!(hw->mbx.ops.check_for_rst(hw, 0))) {
> -               *link_up = false;
> -               *speed = 0;
> -               return -1;
> -       }
> +       /* If we were hit with a reset drop the link */
> +       if (!mbx->ops.check_for_rst(hw, 0) || !mbx->timeout)
> +               mac->get_link_status = true;
> 
> -       links_reg = IXGBE_VFREAD_REG(hw, IXGBE_VFLINKS);
> +       if (!mac->get_link_status)
> +               goto out;
> 
> When I run "testpmd" on ixgbevf ports either in the host OS or passed
> through to a virtual machine, "testpmd" reports that the ixgbevf ports
> have "speed 100 Mbps - half-duplex".  With the previous code (or with
> my patch), "testpmd" reports "speed 10000 Mbps - full-duplex".