From: Oliver Neukum <oneukum@suse.de>
To: Ming Lei <ming.lei@canonical.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"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 4/4] USBNET: ax88179_178a: enable tso if host supports sg dma
Date: Wed, 31 Jul 2013 16:02:46 +0200 [thread overview]
Message-ID: <1375279366.14846.1.camel@linux-fkkt.site> (raw)
In-Reply-To: <CACVXFVNk+h7kBWTFT2NiGy+2F6LPatda3oL9+uuaQnT-u5J8wg@mail.gmail.com>
On Wed, 2013-07-31 at 21:50 +0800, Ming Lei wrote:
> In the usbnet case, the driver already supports non-sg well. Actually,
> all current drivers should support non-sg well because urb->sg wasn't
> introduced for very long time. We can think it as a new feature or DMA
> enhancement for xHCI controller.
>
> If you mean buffer debounce for dma sg support on ehci/uhci/ohci/..,
> maybe we need to discuss and evaluate further.
We cannot lie to the networking layer. Either we can do sg in hardware
or we cannot. This is unfortunately determined by the HC not the device
on the bus. How else but from the host driver would we get the
information?
Regards
Oliver
next prev parent reply other threads:[~2013-07-31 14:02 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
[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
2013-07-31 15:25 ` [PATCH 0/4] USB & USBNET: loose DMA SG check and support usbnet DMA SG Eric Dumazet
2013-07-31 10:51 ` [PATCH 3/4] USBNET: support " 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 [this message]
[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
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