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Message-ID:
<TYBPR01MB5341F67A3FDC5097F64AFB7DD88BA@TYBPR01MB5341.jpnprd01.prod.outlook.com>
Date: Thu, 7 Dec 2023 00:25:54 +0000
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: Simon Horman <horms@...nel.org>
CC: "s.shtylyov@....ru" <s.shtylyov@....ru>, "davem@...emloft.net"
<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH net-next v3 3/9] net: rswitch: Use build_skb() for RX
Hello Simon-san,
> From: Simon Horman, Sent: Thursday, December 7, 2023 4:08 AM
>
> On Mon, Dec 04, 2023 at 10:20:52AM +0900, Yoshihiro Shimoda wrote:
> > If this hardware receives a jumbo frame like 2KiB or more, it will be
> > split into multiple queues. In the near future, to support this, use
> > build_skb() instead of netdev_alloc_skb_ip_align().
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>
> ...
>
> > static void rswitch_gwca_ts_queue_free(struct rswitch_private *priv)
> > @@ -308,17 +308,19 @@ static int rswitch_gwca_queue_alloc(struct net_device *ndev,
> > gq->ring_size = ring_size;
> > gq->ndev = ndev;
> >
> > - gq->skbs = kcalloc(gq->ring_size, sizeof(*gq->skbs), GFP_KERNEL);
> > - if (!gq->skbs)
> > - return -ENOMEM;
> > -
> > if (!dir_tx) {
> > - rswitch_gwca_queue_alloc_skb(gq, 0, gq->ring_size);
> > + gq->rx_bufs = kcalloc(gq->ring_size, sizeof(*gq->rx_bufs), GFP_KERNEL);
> > + if (!gq->rx_bufs)
> > + goto out;
>
> Hi Shimoda-san,
>
> there is no need to re-spin because of this,
> but I have some commends on error handling.
>
> I think that for consistency this can just return -ENOMEM.
Thank you for your comments! I think so. So, I'll fix it on v4.
> Or alternatively, perhaps 'goto out' can be used for the (!gq->skbs)
> condition below.
>
> > + rswitch_gwca_queue_alloc_rx_buf(gq, 0, gq->ring_size);
>
> Not strictly related to this patch, but should
> the return value of rswitch_gwca_queue_alloc_rx_buf be checked?
I think so. I'll fix it.
Best regards,
Yoshihiro Shimoda
> >
> > gq->rx_ring = dma_alloc_coherent(ndev->dev.parent,
> > sizeof(struct rswitch_ext_ts_desc) *
> > (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
> > } else {
> > + gq->skbs = kcalloc(gq->ring_size, sizeof(*gq->skbs), GFP_KERNEL);
> > + if (!gq->skbs)
> > + return -ENOMEM;
> > gq->tx_ring = dma_alloc_coherent(ndev->dev.parent,
> > sizeof(struct rswitch_ext_desc) *
> > (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
>
> ...
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