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From: Ming Lei <tom.leiming@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Ben Hutchings" <bhutchings@solarflare.com>,
	"Oliver Neukum" <oliver@neukum.org>,
	"Grant Grundler" <grundler@google.com>,
	"Freddy Xin" <freddy@asix.com.tw>,
	"David Miller" <davem@davemloft.net>,
	netdev <netdev@vger.kernel.org>,
	linux-usb@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	"ASIX Louis [蘇威陸]" <louis@asix.com.tw>,
	"Allan Chou" <allan@asix.com.tw>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A
Date: Thu, 25 Jul 2013 13:25:12 +0800	[thread overview]
Message-ID: <CACVXFVNyFk0Zpi4tC0ENiq8RcrtrjYW-Dhs+A56+Pw4BKm8y8A@mail.gmail.com> (raw)
In-Reply-To: <1374729058.23313.8.camel@edumazet-glaptop>

On Thu, Jul 25, 2013 at 1:10 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Thu, 2013-07-25 at 10:28 +0800, Ming Lei wrote:
>
>>
>> It depends if size of sg buffer(except for last one) in the sg list can be
>> divided by usb endpoint's max packet size(512 or 1024), at least there
>> is the constraint:
>>
>> http://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=10e232c597ac757e7f8600649f7e872e86de190f
>>
>> I am wondering if network stack can meet that.  If not, it might be a
>> bit difficult
>> because lots of USB host controller don't support that, and driver may have
>> to support SG and non-SG at the same time for working well on all HCs.
>
> I do not see the problem.
>
> If one skb has 2 fragments of 32KB, couldn't they be split into 64 1K
> segments by the device driver ?

OK, if length of fragments of all SKBs from network stack can always guarantee
to be divided by 1024, that is fine,  seems I worry about too much, :-)

Thanks,
-- 
Ming Lei

  reply	other threads:[~2013-07-25  5:25 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-20  9:16 [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A freddy
2013-07-22 17:07 ` Eric Dumazet
2013-07-22 17:11   ` Ben Hutchings
2013-07-22 18:29   ` Grant Grundler
2013-07-22 18:38     ` Ben Hutchings
2013-07-22 18:47       ` Eric Dumazet
2013-07-22 19:47         ` Ben Hutchings
     [not found]           ` <1374522471.1635.48.camel-/LGg1Z1CJKQ+9kgCwbf1HqK4ta4zdZpAajtMo4Cw6ucAvxtiuMwx3w@public.gmane.org>
2013-07-23  6:10             ` Eric Dumazet
2013-07-23 23:46               ` David Miller
2013-07-23 23:56                 ` Eric Dumazet
2013-07-24  0:05                   ` Eric Dumazet
2013-07-24  0:15                     ` [PATCH] usbnet: do not pretend to support SG/TSO Eric Dumazet
2013-07-26 20:48                       ` David Miller
2013-07-24  0:17                     ` [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A David Miller
2013-07-24  2:29                 ` Grant Grundler
     [not found]                   ` <CANEJEGtLavwdPdq_Qojz_x-DQ3KXfZp0vPYr6imKtNxN0Hf_2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-24  2:32                     ` Grant Grundler
2013-07-25  2:28               ` Ming Lei
2013-07-25  5:10                 ` Eric Dumazet
2013-07-25  5:25                   ` Ming Lei [this message]
     [not found]                     ` <CACVXFVNyFk0Zpi4tC0ENiq8RcrtrjYW-Dhs+A56+Pw4BKm8y8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-25 11:01                       ` Eric Dumazet
2013-07-25 14:52                         ` Ming Lei
2013-07-25 15:00                           ` Ben Hutchings
     [not found]                           ` <CACVXFVNre5SsJhaVqFNRcop7ahqxabWqHZkjBZccj1ZqOAUZ9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-25 15:11                             ` Eric Dumazet
2013-07-25 13:34                     ` Ben Hutchings

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