From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
To: Oliver Neukum <oneukum@suse.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ming Lei <ming.lei@canonical.com>,
"David S. Miller" <davem@davemloft.net>,
Freddy Xin <freddy@asix.com.tw>,
Eric Dumazet <eric.dumazet@gmail.com>,
Ben Hutchings <bhutchings@solarflare.com>,
Grant Grundler <grundler@google.com>,
netdev@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH 2/4] USB: XHCI: mark no_sg_limit
Date: Thu, 1 Aug 2013 13:47:57 -0700 [thread overview]
Message-ID: <20130801204757.GB6961@xanatos> (raw)
In-Reply-To: <1375344951.1518.0.camel@linux-fkkt.site>
On Thu, Aug 01, 2013 at 10:15:51AM +0200, Oliver Neukum wrote:
> On Thu, 2013-08-01 at 15:30 +0800, Greg Kroah-Hartman wrote:
> > On Wed, Jul 31, 2013 at 09:40:26AM -0700, Sarah Sharp wrote:
> > > On Wed, Jul 31, 2013 at 06:51:47PM +0800, Ming Lei wrote:
> > > > This patch marks all xHCI controllers as no_sg_limit since
> > > > xHCI supports building packet from discontinuous buffers.
> > > >
> > > > Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
> > > > Signed-off-by: Ming Lei <ming.lei@canonical.com>
> > >
> > > Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
> >
> > Is it a requirement that all xhci controllers support sg? I know we are
> > starting to see other controllers (the platform code?) so would they
> > need to support this as well?
>
> The way XHCI describes transfers allows them to be arbitrary.
Yes, Oliver is right. The xHCI host can handle arbitrary length buffers
chained together into one transfer, and now that we have the xHCI driver
ring expansion code in place, we should be able to make them as long as
the USB core will allow.
Sarah Sharp
next prev parent reply other threads:[~2013-08-01 20:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-31 10:51 [PATCH 0/4] USB & USBNET: loose DMA SG check and support usbnet DMA SG Ming Lei
2013-07-31 10:51 ` [PATCH 1/4] USB: introduce no_sg_limit field into usb_bus Ming Lei
2013-07-31 10:51 ` [PATCH 3/4] USBNET: support DMA SG Ming Lei
2013-07-31 10:51 ` [PATCH 4/4] USBNET: ax88179_178a: enable tso if host supports sg dma Ming Lei
2013-07-31 12:47 ` Greg Kroah-Hartman
2013-07-31 13:50 ` Ming Lei
2013-07-31 14:02 ` Oliver Neukum
[not found] ` <1375279366.14846.1.camel-B2T3B9s34ElbnMAlSieJcQ@public.gmane.org>
2013-07-31 15:15 ` Eric Dumazet
2013-07-31 15:25 ` Ming Lei
2013-08-01 2:04 ` Ming Lei
[not found] ` <1375267909-30373-5-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2013-08-01 3:51 ` Eric Dumazet
2013-08-01 4:41 ` Ming Lei
2013-08-01 5:04 ` Eric Dumazet
2013-08-01 8:10 ` Ming Lei
[not found] ` <CACVXFVMt-TgRVU+iA3NVuUzJSeXUPGvV89OnDdHaLEB1Ua6aAw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-08-01 13:21 ` Eric Dumazet
2013-08-01 13:49 ` [PATCH net-next] ax88179_178a: avoid copy of tx tcp packets Eric Dumazet
2013-08-01 13:52 ` Eric Dumazet
2013-08-04 4:56 ` David Miller
2013-08-01 15:30 ` [PATCH 4/4] USBNET: ax88179_178a: enable tso if host supports sg dma Grant Grundler
2013-08-01 15:36 ` Eric Dumazet
2013-08-01 16:12 ` Grant Grundler
2013-07-31 11:12 ` [PATCH 0/4] USB & USBNET: loose DMA SG check and support usbnet DMA SG Oliver Neukum
2013-07-31 11:55 ` Ming Lei
[not found] ` <1375267909-30373-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2013-07-31 10:51 ` [PATCH 2/4] USB: XHCI: mark no_sg_limit Ming Lei
2013-07-31 16:40 ` Sarah Sharp
2013-08-01 7:30 ` Greg Kroah-Hartman
2013-08-01 8:15 ` Oliver Neukum
2013-08-01 20:47 ` Sarah Sharp [this message]
2013-07-31 15:25 ` [PATCH 0/4] USB & USBNET: loose DMA SG check and support usbnet DMA SG Eric Dumazet
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