Re: [PATCH v5] net: stmmac: fix maxmtu assignment to be within valid range

From: Andy Shevchenko
Date: Sat Jan 07 2017 - 20:07:00 EST


On Sat, Jan 7, 2017 at 11:32 AM, Kweh, Hock Leong
<hock.leong.kweh@xxxxxxxxx> wrote:
> From: "Kweh, Hock Leong" <hock.leong.kweh@xxxxxxxxx>
>
> 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.

FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>

>
> Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@xxxxxxxxx>
> ---
> changelog v5:
> * revert back that plat->maxmtu > ndev->max_mtu is a valid case
> when ndev->max_mtu assignment is entering to the else statement
> * add comment to enchance clarification
>
> changelog v4:
> * add print warning message when maxmtu > max_mtu as well
> * add maxmtu = JUMBO_LEN into each *_default_data() at stmmac_pci.c
>
> 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 | 10 +++++++++-
> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 6 ++++++
> 2 files changed, 15 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..8e56dc4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3345,8 +3345,16 @@ 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)
> + /* Will not overwrite ndev->max_mtu if plat->maxmtu > ndev->max_mtu
> + * as well as plat->maxmtu < ndev->min_mtu which is a invalid range.
> + */
> + 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..3da4737 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> @@ -89,6 +89,9 @@ static void stmmac_default_data(struct plat_stmmacenet_data *plat)
>
> /* Set default value for unicast filter entries */
> plat->unicast_filter_entries = 1;
> +
> + /* Set the maxmtu to a default of JUMBO_LEN */
> + plat->maxmtu = JUMBO_LEN;
> }
>
> static int quark_default_data(struct plat_stmmacenet_data *plat,
> @@ -126,6 +129,9 @@ static int quark_default_data(struct plat_stmmacenet_data *plat,
> /* Set default value for unicast filter entries */
> plat->unicast_filter_entries = 1;
>
> + /* Set the maxmtu to a default of JUMBO_LEN */
> + plat->maxmtu = JUMBO_LEN;
> +
> return 0;
> }
>
> --
> 1.7.9.5
>



--
With Best Regards,
Andy Shevchenko