USB: introduce usb_device_no_sg_constraint() helper
Some host controllers(such as xHCI) can support building
packet from discontinuous buffers, so introduce one flag
and helper for this kind of host controllers, then the
feature can help some applications(such as usbnet) by
supporting arbitrary length of sg buffers.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/usb.h b/include/linux/usb.h
index acb1b0a..001629c 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -337,6 +337,7 @@
* the ep queue on a short transfer
* with the URB_SHORT_NOT_OK flag set.
*/
+ unsigned no_sg_constraint:1; /* no sg constraint */
unsigned sg_tablesize; /* 0 or largest number of sg list entries */
int devnum_next; /* Next open device number in
@@ -684,6 +685,11 @@
return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
}
+static inline bool usb_device_no_sg_constraint(struct usb_device *udev)
+{
+ return udev && udev->bus && udev->bus->no_sg_constraint;
+}
+
/*-------------------------------------------------------------------------*/
@@ -1253,7 +1259,7 @@
* transfer_buffer.
* @sg: scatter gather buffer list, the buffer size of each element in
* the list (except the last) must be divisible by the endpoint's
- * max packet size
+ * max packet size if no_sg_constraint isn't set in 'struct usb_bus'
* @num_mapped_sgs: (internal) number of mapped sg entries
* @num_sgs: number of entries in the sg list
* @transfer_buffer_length: How big is transfer_buffer. The transfer may