From: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
To: Salil Mehta <salil.mehta-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: "davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org"
<davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
"Zhuangyuzeng (Yisen)"
<yisen.zhuang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
"lipeng (Y)" <lipeng321-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
"mehta.salil.lnk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<mehta.salil.lnk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linuxarm <linuxarm-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH net-next] net: hns3: Add support to change MTU in hardware & netdev
Date: Fri, 18 Aug 2017 18:01:57 +0200 [thread overview]
Message-ID: <20170818160157.GB3258@lunn.ch> (raw)
In-Reply-To: <F4CC6FACFEB3C54C9141D49AD221F7F93B86F9E7-WFPaWmAhWqtUuCJht5byYAK1hpo4iccwjNknBlVQO8k@public.gmane.org>
> for example,
> file: drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>
> netdev->priv_flags |= IFF_UNICAST_FLT;
>
> + /* MTU range: 81 - 9600 */
> + netdev->min_mtu = 81;
> + netdev->max_mtu = MAX_MTU;
In this cause, the driver is not using the default values. So it sets
them.
Anyway, try it. After your alloc_etherdev_mqs(), print the value of
min_mtu. It should already be set to MIN_ETH_MTU.
> I see. IMHO HNS3 is currently limited by maximum buffer per descriptor
> which is 64k. I am sure such frames would get dropped in the hardware
> itself and which I guess should be more preferable than dropping in
> driver since it saves you some precious cpu cycles?
If you hardware handles this, then you don't need to do anything.
Andrew
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next prev parent reply other threads:[~2017-08-18 16:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-18 11:35 [PATCH net-next] net: hns3: Add support to change MTU in hardware & netdev Salil Mehta
2017-08-18 13:31 ` Andrew Lunn
2017-08-18 14:55 ` Salil Mehta
[not found] ` <F4CC6FACFEB3C54C9141D49AD221F7F93B86F75F-WFPaWmAhWqtUuCJht5byYAK1hpo4iccwjNknBlVQO8k@public.gmane.org>
2017-08-18 15:03 ` Andrew Lunn
[not found] ` <20170818150358.GA3258-g2DYL2Zd6BY@public.gmane.org>
2017-08-18 15:34 ` Salil Mehta
[not found] ` <F4CC6FACFEB3C54C9141D49AD221F7F93B86F9E7-WFPaWmAhWqtUuCJht5byYAK1hpo4iccwjNknBlVQO8k@public.gmane.org>
2017-08-18 16:01 ` Andrew Lunn [this message]
2017-08-18 16:10 ` Salil Mehta
2017-08-18 17:01 ` Salil Mehta
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