netdev - Re: [PATCH v4 net-next] net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)

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Date:   Mon, 12 Apr 2021 11:52:43 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Wei Liu <liuwe@...rosoft.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "bernd@...rovitsch.priv.at" <bernd@...rovitsch.priv.at>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        Shachar Raindel <shacharr@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH v4 net-next] net: mana: Add a driver for Microsoft Azure
 Network Adapter (MANA)

On Mon, Apr 12, 2021 at 08:35:32AM +0000, Dexuan Cui wrote:
> > From: Leon Romanovsky <leon@...nel.org>
> > Sent: Monday, April 12, 2021 12:46 AM
> > To: Dexuan Cui <decui@...rosoft.com>
> > > ...
> > > +#define ANA_MAJOR_VERSION	0
> > > +#define ANA_MINOR_VERSION	1
> > > +#define ANA_MICRO_VERSION	1
> > 
> > Please don't introduce drier versions.
> 
> This is not the usual "driver version", though it's called  "drv version" :-)
> As you can see, the driver does not use the macro MODULE_VERSION().
> 
> Here the "drv version" actually means the version of the VF-to-PF protocol,
> with which the Azure Network Adapter ethernet NIC driver (i.e. the VF driver)
> talks to the PF driver.  The protocol version determines the formats of the
> messages that are sent from the VF driver to the PF driver, e.g. query the
> MAC address, create Send/Receive queues, configure RSS, etc.
> 
> Currently the protocol versin is 0.1.1 You may ask why it's called
> "drv version" rather than "protocol version" -- it's because the PF driver
> calls it that way, so I think here the VF driver may as well use the same
> name. BTW, the "drv ver" info is passed to the PF driver in the below
> function:

Ohh, yes, the "driver version" is not the ideal name for that.

I already looked on it in previous patch, came to the conclusion about
the protocol and forgot :(.

> 
> static int mana_query_client_cfg(struct ana_context *ac, u32 drv_major_ver,
>                                  u32 drv_minor_ver, u32 drv_micro_ver,
>                                  u16 *max_num_vports)
> {
>         struct gdma_context *gc = ac->gdma_dev->gdma_context;
>         struct ana_query_client_cfg_resp resp = {};
>         struct ana_query_client_cfg_req req = {};
>         struct device *dev = gc->dev;
>         int err = 0;
> 
>         mana_gd_init_req_hdr(&req.hdr, ANA_QUERY_CLIENT_CONFIG,
>                              sizeof(req), sizeof(resp));
>         req.drv_major_ver = drv_major_ver;
>         req.drv_minor_ver = drv_minor_ver;
>         req.drv_micro_ver = drv_micro_ver;
> 
>         err = mana_send_request(ac, &req, sizeof(req), &resp, sizeof(resp));
> 
> Thanks,
> Dexuan
>