From: Bjorn Helgaas <firstname.lastname@example.org> To: Leon Romanovsky <email@example.com> Cc: "Greg Kroah-Hartman" <firstname.lastname@example.org>, "Bjorn Helgaas" <email@example.com>, "Saeed Mahameed" <firstname.lastname@example.org>, "Jason Gunthorpe" <email@example.com>, "Alexander Duyck" <firstname.lastname@example.org>, "Jakub Kicinski" <email@example.com>, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, "Don Dutile" <email@example.com>, "Alex Williamson" <firstname.lastname@example.org>, "David S . Miller" <email@example.com>, "Krzysztof Wilczyński" <firstname.lastname@example.org> Subject: Re: [PATCH mlx5-next v6 1/4] PCI: Add sysfs callback to allow MSI-X table size change of SR-IOV VFs Date: Tue, 23 Feb 2021 15:07:43 -0600 [thread overview] Message-ID: <20210223210743.GA1475710@bjorn-Precision-5520> (raw) In-Reply-To: <YDIExpismOnU3c4k@unreal> On Sun, Feb 21, 2021 at 08:59:18AM +0200, Leon Romanovsky wrote: > On Sat, Feb 20, 2021 at 01:06:00PM -0600, Bjorn Helgaas wrote: > > On Fri, Feb 19, 2021 at 09:20:18AM +0100, Greg Kroah-Hartman wrote: > > > > > Ok, can you step back and try to explain what problem you are trying to > > > solve first, before getting bogged down in odd details? I find it > > > highly unlikely that this is something "unique", but I could be wrong as > > > I do not understand what you are wanting to do here at all. > > > > We want to add two new sysfs files: > > > > sriov_vf_total_msix, for PF devices > > sriov_vf_msix_count, for VF devices associated with the PF > > > > AFAICT it is *acceptable* if they are both present always. But it > > would be *ideal* if they were only present when a driver that > > implements the ->sriov_get_vf_total_msix() callback is bound to the > > PF. > > BTW, we already have all possible combinations: static, static with > folder, with and without "sriov_" prefix, dynamic with and without > folders on VFs. > > I need to know on which version I'll get Acked-by and that version I > will resubmit. I propose that you make static attributes for both files, so "sriov_vf_total_msix" is visible for *every* PF in the system and "sriov_vf_msix_count" is visible for *every* VF in the system. The PF "sriov_vf_total_msix" show function can return zero if there's no PF driver or it doesn't support ->sriov_get_vf_total_msix(). (Incidentally, I think the documentation should mention that when it *is* supported, the contents of this file are *constant*, i.e., it does not decrease as vectors are assigned to VFs.) The "sriov_vf_msix_count" set function can ignore writes if there's no PF driver or it doesn't support ->sriov_get_vf_total_msix(), or if a VF driver is bound. Any userspace software must be able to deal with those scenarios anyway, so I don't think the mere presence or absence of the files is a meaningful signal to that software. If we figure out a way to make the files visible only when the appropriate driver is bound, that might be nice and could always be done later. But I don't think it's essential. Bjorn
next prev parent reply other threads:[~2021-02-23 21:08 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-09 13:34 [PATCH mlx5-next v6 0/4] Dynamically assign MSI-X vectors count Leon Romanovsky 2021-02-09 13:34 ` [PATCH mlx5-next v6 1/4] PCI: Add sysfs callback to allow MSI-X table size change of SR-IOV VFs Leon Romanovsky 2021-02-15 21:01 ` Bjorn Helgaas 2021-02-16 7:33 ` Leon Romanovsky 2021-02-16 16:12 ` Bjorn Helgaas 2021-02-16 19:58 ` Leon Romanovsky 2021-02-17 18:02 ` Bjorn Helgaas 2021-02-17 19:25 ` Jason Gunthorpe 2021-02-17 20:28 ` Bjorn Helgaas 2021-02-17 23:52 ` Jason Gunthorpe 2021-02-18 10:15 ` Leon Romanovsky 2021-02-18 22:39 ` Bjorn Helgaas 2021-02-19 7:52 ` Leon Romanovsky 2021-02-19 8:20 ` Greg Kroah-Hartman 2021-02-19 16:58 ` Leon Romanovsky 2021-02-20 19:06 ` Bjorn Helgaas 2021-02-21 6:59 ` Leon Romanovsky 2021-02-23 21:07 ` Bjorn Helgaas [this message] 2021-02-24 8:09 ` Greg Kroah-Hartman 2021-02-24 21:37 ` Don Dutile 2021-02-24 9:53 ` Leon Romanovsky 2021-02-24 15:07 ` Bjorn Helgaas 2021-02-21 13:00 ` Greg Kroah-Hartman 2021-02-21 13:55 ` Leon Romanovsky 2021-02-21 15:01 ` Greg Kroah-Hartman 2021-02-21 15:30 ` Leon Romanovsky 2021-02-16 20:37 ` Jason Gunthorpe 2021-02-09 13:34 ` [PATCH mlx5-next v6 2/4] net/mlx5: Add dynamic MSI-X capabilities bits Leon Romanovsky 2021-02-09 13:34 ` [PATCH mlx5-next v6 3/4] net/mlx5: Dynamically assign MSI-X vectors count Leon Romanovsky 2021-02-09 13:34 ` [PATCH mlx5-next v6 4/4] net/mlx5: Allow to the users to configure number of MSI-X vectors Leon Romanovsky 2021-02-09 21:06 ` [PATCH mlx5-next v6 0/4] Dynamically assign MSI-X vectors count Alexander Duyck 2021-02-14 5:24 ` Leon Romanovsky
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