lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Tue, 22 Jul 2014 20:01:04 -0700
From:	Alexander Duyck <>
To:	David Miller <>,
Subject: Re: [PATCH net-next] cxgb4: Fix for SR-IOV VF initialization

On 07/22/2014 03:34 PM, David Miller wrote:
> From: Hariprasad Shenai <>
> Date: Tue, 22 Jul 2014 16:26:20 +0530
>> Commit 35b1de5 ("rdma/cxgb4: Fixes cxgb4 probe failure in VM when PF is exposed
>> through PCI Passthrough") introduced a regression, where VF failed to
>> initialize. This commit fixes it.
>> Signed-off-by: Casey Leedom <>
>> Signed-off-by: Hariprasad Shenai <>
> This commit message need to explain things better, how exactly was
> the regression introduced, what's exactly wrong with the current code?
> I actually can't figure it out myself, other than to say that maybe
> replacing things with:
> 	func = PCI_FUNC(pdev->devfn);
>  	if (func < ARRAY_SIZE(num_vf) && num_vf[func] > 0)
>  		if (pci_enable_sriov(pdev, num_vf[func]) == 0)
> would work equally as well.  That's precisely what the code was
> doing before the mentioned commit.
> Why do we have to iterate over _ALL_ functions of the PCI device,
> rather than just directly enable SRIOV on the one function whether
> it bet PCI_FUNC(pdev->devfn) or that WHOAMI value?
> You need to explain this so that people understand the how and the
> why of your changes.
> Thanks.

What it looks like it is doing is forcing the loop to iterate over
multiple PFs enabling SR-IOV on each one.  Same thing for disabling on
remove.  I would think this would fail for a multifunction device since
calling this a pci_enable_sriov a second time with values when SR-IOV is
enabled should return -EINVAL.

I thought the use of module parameters for SR-IOV had been deprecated in
favor of the PCI sysfs approach?  It seems like switching over might be
a better way to resolve whatever issue this was trying to address.



To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists