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Message-ID: <F54AEECA5E2B9541821D670476DAE19C5A918C6E@PGSMSX102.gar.corp.intel.com>
Date: Fri, 6 Jan 2017 23:38:04 +0000
From: "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To: Joao Pinto <Joao.Pinto@...opsys.com>,
"David S. Miller" <davem@...emloft.net>,
Giuseppe CAVALLARO <peppe.cavallaro@...com>,
"seraphin.bonnaffe@...com" <seraphin.bonnaffe@...com>,
Jarod Wilson <jarod@...hat.com>,
Andy Shevchenko <andy.shevchenko@...il.com>
CC: Alexandre TORGUE <alexandre.torgue@...il.com>,
Joachim Eastwood <manabian@...il.com>,
Niklas Cassel <niklas.cassel@...s.com>,
Johan Hovold <johan@...nel.org>, "pavel@....cz" <pavel@....cz>,
"lars.persson@...s.com" <lars.persson@...s.com>,
netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3] net: stmmac: fix maxmtu assignment to be within
valid range
> -----Original Message-----
> From: Joao Pinto [mailto:Joao.Pinto@...opsys.com]
> Sent: Saturday, January 07, 2017 12:58 AM
> To: Kweh, Hock Leong <hock.leong.kweh@...el.com>; David S. Miller
> <davem@...emloft.net>; Joao Pinto <Joao.Pinto@...opsys.com>; Giuseppe
> CAVALLARO <peppe.cavallaro@...com>; seraphin.bonnaffe@...com; Jarod
> Wilson <jarod@...hat.com>; Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Alexandre TORGUE <alexandre.torgue@...il.com>; Joachim Eastwood
> <manabian@...il.com>; Niklas Cassel <niklas.cassel@...s.com>; Johan Hovold
> <johan@...nel.org>; pavel@....cz; lars.persson@...s.com; netdev
> <netdev@...r.kernel.org>; LKML <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH v3] net: stmmac: fix maxmtu assignment to be within valid
> range
>
>
> Hi Wilson,
>
> Às 12:49 AM de 1/7/2017, Kweh, Hock Leong escreveu:
> > From: "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
> >
> > There is no checking valid value of maxmtu when getting it from device tree.
> > This resolution added the checking condition to ensure the assignment is
> > made within a valid range.
> >
> > Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@...el.com>
> > ---
> > changelog v3:
> > * print the warning message only if maxmtu < min_mtu
> > * add maxmtu = JUMBO_LEN at stmmac_pci.c to follow stmmac_platform.c
> >
> > changelog v2:
> > * correction of "devicetree" to "device tree" reported by Andy
> > * print warning message while maxmtu is not in valid range
> >
> > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 +++++++-
> > drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 4 ++++
> > 2 files changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > index 92ac006..ce74ae6 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > @@ -3345,8 +3345,14 @@ int stmmac_dvr_probe(struct device *device,
> > ndev->max_mtu = JUMBO_LEN;
> > else
> > ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD +
> NET_IP_ALIGN);
> > - if (priv->plat->maxmtu < ndev->max_mtu)
> > +
> > + if ((priv->plat->maxmtu < ndev->max_mtu) &&
> > + (priv->plat->maxmtu >= ndev->min_mtu))
> > ndev->max_mtu = priv->plat->maxmtu;
> > + else if (priv->plat->maxmtu < ndev->min_mtu)
> > + netdev_warn(priv->dev,
> > + "%s: warning: maxmtu having invalid value (%d)\n",
> > + __func__, priv->plat->maxmtu);
> >
> > if (flow_ctrl)
> > priv->flow_ctrl = FLOW_AUTO; /* RX/TX pause on */
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> > index a283177..e539afe 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> > @@ -204,6 +204,10 @@ static int stmmac_pci_probe(struct pci_dev *pdev,
> >
> > pci_set_master(pdev);
> >
> > + /* Set the maxmtu to a default of JUMBO_LEN in case the
> > + * parameter is not defined for the device.
> > + */
> > + plat->maxmtu = JUMBO_LEN;
>
> I suggest to put this configuration in one of the default config functions.
>
> Tahnks.
>
My original thought is to have one line for all *_default_data() instead of having
multiple same line inside each *_default_data(). If this is not a big concern of
future expand, I can do that. Thanks.
> > if (info) {
> > info->pdev = pdev;
> > if (info->setup) {
> >
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