On Tue, 19 Nov 2013, Sarah Sharp wrote:

> The xHCI driver can limit the number of sg-list entries through
> hcd->self.sg_tablesize.  It's currently set to ~0, which is "however
> many entries you want.  You could set that to the number of TRBs in a
> segment (minus one for the link TRB).
> 
> The usb-storage and uas drivers currently use sg_tablesize.  Could the
> network stack be taught to use sg_tablesize as well?

The sg_tablesize you're talking about is a field in struct usb_bus
(there's a similar field in struct scsi_host_template).  It's not
relevant to the network stack, since network interfaces aren't USB host
controllers (or SCSI hosts).

Alan Stern

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