Hi, Arjav Parikh <arjav.parikh@xxxxxxxxxxx> writes: > I want to use scatter gather logic in DWC3. As per code in DWC3 I > identified that DWC3 supports scatter-gather implementation. > > Now, to check the working of scatter-gather I randomly prepared a > buffer containing some strings and pass its address to sg list. > > I am doing the above operation in below manner: > 1. Created and array containing the strings which I want to send as > packets over ECM gadget. > 2. sg_init_table(array_name,array_length) > sg_set_set_buf(array_list,pieces_packets,length_of_packets) > 3. Copied the address of array_list, length of packet, no of scatter > gather and transfer_complete routine to into usb_request structure. > Then this usb_request_structure is passed to usb_ep_queue function. > > Now expecting that whenever ping is done then these packets will also > be transferred to USB which I am checking at other end using wireshark > but I am not receiving these packets. > > On adding Debugs I identified that these packets are not > scatter-gathered and sent in form of single buffers only. > > Can anyone please explain the procedure of scatter gather and how to > check the scatter gather in DWC3. where is your diff showing your changes to the ethernet gadget? There is, btw, one gadget in tree which uses SG lists. It's the TCM gadget fabric. You may want to try that one instead, since it's supposed to work as is. -- balbi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
