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

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Message-ID: <YG1qF8lULn8lLJa/@unreal>
Date:   Wed, 7 Apr 2021 11:15:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "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>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH net-next] net: mana: Add a driver for Microsoft Azure
 Network Adapter (MANA)

On Wed, Apr 07, 2021 at 08:02:17AM +0000, Dexuan Cui wrote:
> > From: Andrew Lunn <andrew@...n.ch>
> > Sent: Tuesday, April 6, 2021 6:08 PM
> > To: Dexuan Cui <decui@...rosoft.com>
> > 
> > > +static int gdma_query_max_resources(struct pci_dev *pdev)
> > > +{
> > > +	struct gdma_context *gc = pci_get_drvdata(pdev);
> > > +	struct gdma_general_req req = { 0 };
> > > +	struct gdma_query_max_resources_resp resp = { 0 };
> > > +	int err;
> > 
> > Network drivers need to use reverse christmas tree. I spotted a number
> > of functions getting this wrong. Please review the whole driver.
> 
> Hi Andrew, thanks for the quick comments!
> 
> I think In general the patch follows the reverse christmas tree style.
> 
> For the function you pointed out, I didn't follow the reverse
> christmas tree style because I wanted to keep the variable defines
> more natural, i.e. first define 'req' and then 'resp'.
> 
> I can swap the 2 lines here, i.e. define 'resp' first, but this looks a little
> strange to me, because in some other functions the 'req' should be
> defined first, e.g. 
> 
> int gdma_test_eq(struct gdma_context *gc, struct gdma_queue *eq)
> {
>         struct gdma_generate_test_event_req req = { 0 };
>         struct gdma_general_resp resp = { 0 };

BTW, you don't need to write { 0 }, the {} is enough.

Thanks