Hi, >> I modified the UDC driver to send out zero length data packet. Now the >> linux host is able to see the USB gadget as a mass storage device and >> read from USB gadget. However, writing to USB gadget fails. The >> SCSI_WRITE_10 command often receives (-104). The usbmon trace showing >> this failure is attached. Is the bulk-out endpoint unable to receive >> command and data continuously, due to error in UDC driver? > > It looks like the data gets received okay. I can't tell what's going > wrong because you did not post the gadget log showing the WRITE > commands. When writing to USB gadget from Linux host, the SCSI_WRITE_10 command is sent out from the Linux host, but the USB gadget receives zero length packet. And after a long wait of 30 seconds, the Linux host resets the connection (-104). The usbmon trace and the UDC driver log are attached. g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 I think UDC driver receives the zero length packet on bulk out endpoint. Thanks, victor
# dmesg [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000<7>g_file_storage gadget: bulk_out_complete --> 0, 0/31 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0: g_file_storage gadget: bulk_out_complete --> 0, 0/31 [start_transfer] 43425355 c5 ept1 out queue len 0x200, buffer 0xc133c000 g_file_storage gadget: bulk-out, length 0:
Attachment:
usbmon_write_gadget2.log
Description: Binary data
