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Date: Thu, 30 Jan 2014 23:05:22 +0100 From: Bjørn Mork <bjorn@...k.no> To: Sarah Sharp <sarah.a.sharp@...ux.intel.com> Cc: Alan Stern <stern@...land.harvard.edu>, David Laight <David.Laight@...LAB.COM>, "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>, "netdev\@vger.kernel.org" <netdev@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, David Miller <davem@...emloft.net>, Dan Williams <dan.j.williams@...el.com>, "Nyman\, Mathias" <mathias.nyman@...el.com>, Mark Lord <mlord@...ox.com>, Freddy Xin <freddy@...x.com.tw> Subject: Re: [PATCH RFC 1/1] usb: Tell xhci when usb data might be misaligned Sarah Sharp <sarah.a.sharp@...ux.intel.com> writes: > On Thu, Jan 30, 2014 at 04:43:54PM -0500, Alan Stern wrote: > >> ehci-hcd gets along okay with the restriction that each SG element >> except the last has to be a multiple of the maxpacket size. xhci-hcd >> can relax this quite a lot, but not all the way. > > What does the EHCI driver do when it receives a SG list from the USB > networking layer that violates this restriction? The USB networking layer won't use SG with the EHCI driver. Commit bcc48f1a7a0d4 introduced no_sg_constraint so that usbnet could enable SG only for host controllers with no such restrictions. I.e. currently for xHCI only. Bjørn -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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