netdev - Re: [PATCH net-next] qed*: Utilize FW 8.33.11.0

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Date:   Tue, 27 Mar 2018 16:27:16 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "Kalderon, Michal" <Michal.Kalderon@...ium.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "Tayar, Tomer" <Tomer.Tayar@...ium.com>,
        "Rangankar, Manish" <Manish.Rangankar@...ium.com>,
        "Elior, Ariel" <Ariel.Elior@...ium.com>
Subject: Re: [PATCH net-next] qed*: Utilize FW 8.33.11.0

On Tue, Mar 27, 2018 at 08:50:24PM +0300, Leon Romanovsky wrote:
> On Tue, Mar 27, 2018 at 05:41:51PM +0000, Kalderon, Michal wrote:
> > > From: Jason Gunthorpe [mailto:jgg@...pe.ca]
> > > Sent: Tuesday, March 27, 2018 12:18 AM
> > > > diff --git a/drivers/infiniband/hw/qedr/main.c
> > > > b/drivers/infiniband/hw/qedr/main.c
> > > > index db4bf97..7dbbe6d 100644
> > > > +++ b/drivers/infiniband/hw/qedr/main.c
> > > > @@ -51,6 +51,7 @@
> > > >  MODULE_DESCRIPTION("QLogic 40G/100G ROCE Driver");
> > > > MODULE_AUTHOR("QLogic Corporation");  MODULE_LICENSE("Dual
> > > BSD/GPL");
> > > > +MODULE_VERSION(QEDR_MODULE_VERSION);
> > > >
> > > >  #define QEDR_WQ_MULTIPLIER_DFT	(3)
> > > >
> > > > diff --git a/drivers/infiniband/hw/qedr/qedr.h
> > > > b/drivers/infiniband/hw/qedr/qedr.h
> > > > index 86d4511..ab0d411 100644
> > > > +++ b/drivers/infiniband/hw/qedr/qedr.h
> > > > @@ -43,6 +43,8 @@
> > > >  #include "qedr_hsi_rdma.h"
> > > >
> > > >  #define QEDR_NODE_DESC "QLogic 579xx RoCE HCA"
> > > > +#define QEDR_MODULE_VERSION "8.33.11.20"
> > > > +
> > >
> > > I thought we had a general prohibition against versions like
> > > this in mainline drivers? And what does this hunk have to do
> > > with supporting new firmware?
> > >
> > I'm assuming you refer only to rdma in regards to version
> > prohibition right ? as looking at all other vendors (including
> > Mellanox) all have module versions under net/ why is rdma
> > different in this way ?  I now searched back mails on the topic
> > and found an email from Leon where he stated: " I am strongly
> > against module versions. You should rely on official kernel
> > version."  But it's not always the inbox driver that is installed
> > or probed, the kernel version is not enough.  Given different
> > distros, vanilla kernels, out of box drivers, etc... it is
> > essential for us that based on logs And modinfo we can determine
> > the qed* drivers that are running.
> 
> We actually stopped to maintain driver versions, just ensure that inbox,
> upstream and MLNX_OFED have different names.
> 
> The discussion thread is here
> https://lists.linuxfoundation.org/pipermail/ksummit-discuss/2017-June/004426.html
> https://lists.linuxfoundation.org/pipermail/ksummit-discuss/2017-June/004441.html

Hmm, Linus pretty clearly said No to MODULE_VERSION and related.

So I can't take this hunk, and you shouldn't do in ethernet either, I
guess.

Honestly the idea that this version will somehow have meaning in the
distro kernels is pretty far fetched. You think distros will backport
patches changing version # in any way that will make some kind of
sense?

Jason