Re: [RFC PATCH net-next 12/28] net: ethernet: ti: cpsw-proxy-client: add NAPI RX polling function

From: Matthew Wilcox <willy@infradead.org>
To: Markus Elfring <Markus.Elfring@web.de>
Cc: Siddharth Vadapalli <s-vadapalli@ti.com>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kernel-janitors@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	MD Danish Anwar <danishanwar@ti.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Roger Quadros <rogerq@kernel.org>,
	Vladimir Oltean <vladimir.oltean@nxp.com>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-doc@vger.kernel.org,
	Misael Lopez Cruz <misael.lopez@ti.com>,
	Sriramakrishnan <srk@ti.com>,
	Vignesh Raghavendra <vigneshr@ti.com>
Subject: Re: [RFC PATCH net-next 12/28] net: ethernet: ti: cpsw-proxy-client: add NAPI RX polling function
Date: Sun, 19 May 2024 15:00:42 +0100	[thread overview]
Message-ID: <ZkoGCpq1XN4t7wHS@casper.infradead.org> (raw)
In-Reply-To: <f9470c3b-5f69-41fa-b0f4-ade18053473a@web.de>

FYI, Markus can be safely ignored.  His opinions are well-established as
being irrelevant.

On Sun, May 19, 2024 at 03:18:52PM +0200, Markus Elfring wrote:
> …
> > +++ b/drivers/net/ethernet/ti/cpsw-proxy-client.c
> …
> > @@ -988,6 +994,189 @@ static int vport_tx_poll(struct napi_struct *napi_tx, int budget)
> …
> > +static int vport_rx_packets(struct virtual_port *vport, u32 rx_chan_idx)
> > +{
> …
> > +	if (unlikely(!netif_running(skb->dev))) {
> > +		dev_kfree_skb_any(skb);
> > +		return -ENODEV;
> > +	}
> 
> I suggest to move such exception handling to the end of this function implementation
> so that it can be better reused also by another if branch.
> https://wiki.sei.cmu.edu/confluence/display/c/MEM12-C.+Consider+using+a+goto+chain+when+leaving+a+function+on+error+when+using+and+releasing+resources
> 
> How do you think about to increase the application of scope-based resource management
> also for such a software component?
> https://elixir.bootlin.com/linux/v6.9.1/source/include/linux/cleanup.h
> 
> Regards,
> Markus
> 

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