/* recv a pdu */ static void stub_rx_pdu(struct usbip_device *ud) { int ret; struct usbip_header pdu; struct stub_device *sdev = container_of(ud, struct stub_device, ud); dbg_stub_rx("Enter\n"); memset(&pdu, 0, sizeof(pdu)); /* 1. receive a pdu header */ dbg_stub_rx("before usbip_xmit\n"); ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0); dbg_stub_rx("after usbip_xmit\n"); if (ret != sizeof(pdu)) { uerr("recv a header, %d\n", ret); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } usbip_header_correct_endian(&pdu, 0); if (dbg_flag_stub_rx) usbip_dump_header(&pdu); if (!valid_request(sdev, &pdu)) { uerr("recv invalid request\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } #if CLIENT > 2 sdev->heartbeat_pending = 0; #endif switch (pdu.base.command) { case USBIP_CMD_UNLINK: stub_recv_cmd_unlink(sdev, &pdu); break; case USBIP_CMD_SUBMIT: stub_recv_cmd_submit(sdev, &pdu); break; #if CLIENT > 2 // added by tf, 110530 case USBIP_HEARTBEAT_REPLY: sdev->heartbeat_pending = 0; break; // end --- added #endif default: /* NOTREACHED */ uerr("unknown pdu\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } }
/* * clear_halt, set_interface, and set_configuration require special tricks. */ static void tweak_special_requests(struct urb *urb) { if (!urb || !urb->setup_packet) return; if (usb_pipetype(urb->pipe) != PIPE_CONTROL) return; if (is_clear_halt_cmd(urb)) /* tweak clear_halt */ tweak_clear_halt_cmd(urb); else if (is_set_interface_cmd(urb)) /* tweak set_interface */ tweak_set_interface_cmd(urb); else if (is_set_configuration_cmd(urb)) /* tweak set_configuration */ tweak_set_configuration_cmd(urb); else if (is_reset_device_cmd(urb)) tweak_reset_device_cmd(urb); else dbg_stub_rx("no need to tweak\n"); }
void stub_rx_loop(struct usbip_task *ut) { struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx); while (1) { if (signal_pending(current)) { dbg_stub_rx("signal caught!\n"); break; } if (usbip_event_happend(ud)) { dbg_stub_rx("event happend\n"); break; } stub_rx_pdu(ud); } }
/* recv a pdu */ static void stub_rx_pdu(struct usbip_device *ud) { int ret; struct usbip_header pdu; struct stub_device *sdev = container_of(ud, struct stub_device, ud); dbg_stub_rx("Enter\n"); memset(&pdu, 0, sizeof(pdu)); /* 1. receive a pdu header */ ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu),0); if (ret != sizeof(pdu)) { uerr("recv a header, %d\n", ret); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } usbip_header_correct_endian(&pdu, 0); if (dbg_flag_stub_rx) usbip_dump_header(&pdu); if (!valid_request(sdev, &pdu)) { uerr("recv invalid request\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } switch (pdu.base.command) { case USBIP_CMD_UNLINK: stub_recv_cmd_unlink(sdev, &pdu); break; case USBIP_CMD_SUBMIT: stub_recv_cmd_submit(sdev, &pdu); break; default: /* NOTREACHED */ uerr("unknown pdu\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); return; } }
static int is_reset_device_cmd(struct urb *urb) { struct usb_ctrlrequest *req; __u16 value; __u16 index; req = (struct usb_ctrlrequest *) urb->setup_packet; value = le16_to_cpu(req->wValue); index = le16_to_cpu(req->wIndex); if ((req->bRequest == USB_REQ_SET_FEATURE) && (req->bRequestType == USB_RT_PORT) && (value = USB_PORT_FEAT_RESET)) { dbg_stub_rx("reset_device_cmd, port %u\n", index); return 1; } else return 0; }
static int tweak_set_interface_cmd(struct urb *urb) { struct usb_ctrlrequest *req; __u16 alternate; __u16 interface; int ret; req = (struct usb_ctrlrequest *) urb->setup_packet; alternate = le16_to_cpu(req->wValue); interface = le16_to_cpu(req->wIndex); dbg_stub_rx("set_interface: inf %u alt %u\n", interface, alternate); ret = usb_set_interface(urb->dev, interface, alternate); if (ret < 0) uinfo("set_interface error: inf %u alt %u, %d\n", interface, alternate, ret); else uinfo("set_interface done: inf %u alt %u\n", interface, alternate); return ret; }
static void stub_recv_cmd_submit(struct stub_device *sdev, struct usbip_header *pdu) { int ret; struct stub_priv *priv; struct usbip_device *ud = &sdev->ud; struct usb_device *udev = interface_to_usbdev(sdev->interface); int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction); priv = stub_priv_alloc(sdev, pdu); if (!priv) return; /* setup a urb */ if (usb_pipeisoc(pipe)) priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets, GFP_KERNEL); else priv->urb = usb_alloc_urb(0, GFP_KERNEL); if (!priv->urb) { uerr("malloc urb\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); return; } /* set priv->urb->transfer_buffer */ if (pdu->u.cmd_submit.transfer_buffer_length > 0) { priv->urb->transfer_buffer = kzalloc(pdu->u.cmd_submit.transfer_buffer_length, GFP_KERNEL); if (!priv->urb->transfer_buffer) { uerr("malloc x_buff\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); return; } } /* set priv->urb->setup_packet */ priv->urb->setup_packet = kzalloc(8, GFP_KERNEL); if (!priv->urb->setup_packet) { uerr("allocate setup_packet\n"); usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); return; } memcpy(priv->urb->setup_packet, &pdu->u.cmd_submit.setup, 8); /* set other members from the base header of pdu */ priv->urb->context = (void *) priv; priv->urb->dev = udev; priv->urb->pipe = pipe; priv->urb->complete = stub_complete; usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0); if (usbip_recv_xbuff(ud, priv->urb) < 0) return; if (usbip_recv_iso(ud, priv->urb) < 0) return; /* no need to submit an intercepted request, but harmless? */ tweak_special_requests(priv->urb); /* urb is now ready to submit */ ret = usb_submit_urb(priv->urb, GFP_KERNEL); if (ret == 0) dbg_stub_rx("submit urb ok, seqnum %u\n", pdu->base.seqnum); else { uerr("submit_urb error, %d\n", ret); usbip_dump_header(pdu); usbip_dump_urb(priv->urb); /* * Pessimistic. * This connection will be discarded. */ usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT); } dbg_stub_rx("Leave\n"); return; }
/* * stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb(). * By unlinking the urb asynchronously, stub_rx can continuously * process coming urbs. Even if the urb is unlinked, its completion * handler will be called and stub_tx will send a return pdu. * * See also comments about unlinking strategy in vhci_hcd.c. */ static int stub_recv_cmd_unlink(struct stub_device *sdev, struct usbip_header *pdu) { struct list_head *listhead = &sdev->priv_init; struct list_head *ptr; unsigned long flags; struct stub_priv *priv; spin_lock_irqsave(&sdev->priv_lock, flags); for (ptr = listhead->next; ptr != listhead; ptr = ptr->next) { priv = list_entry(ptr, struct stub_priv, list); if (priv->seqnum == pdu->u.cmd_unlink.seqnum) { int ret; uinfo("unlink urb %p\n", priv->urb); /* * This matched urb is not completed yet (i.e., be in * flight in usb hcd hardware/driver). Now we are * cancelling it. The unlinking flag means that we are * now not going to return the normal result pdu of a * submission request, but going to return a result pdu * of the unlink request. */ priv->unlinking = 1; /* * In the case that unlinking flag is on, prev->seqnum * is changed from the seqnum of the cancelling urb to * the seqnum of the unlink request. This will be used * to make the result pdu of the unlink request. */ priv->seqnum = pdu->base.seqnum; spin_unlock_irqrestore(&sdev->priv_lock, flags); /* * usb_unlink_urb() is now out of spinlocking to avoid * spinlock recursion since stub_complete() is * sometimes called in this context but not in the * interrupt context. If stub_complete() is executed * before we call usb_unlink_urb(), usb_unlink_urb() * will return an error value. In this case, stub_tx * will return the result pdu of this unlink request * though submission is completed and actual unlinking * is not executed. OK? */ /* In the above case, urb->status is not -ECONNRESET, * so a driver in a client host will know the failure * of the unlink request ? */ ret = usb_unlink_urb(priv->urb); if (ret != -EINPROGRESS) uerr("faild to unlink a urb %p, ret %d\n", priv->urb, ret); return 0; } } dbg_stub_rx("seqnum %d is not pending\n", pdu->u.cmd_unlink.seqnum); /* * The urb of the unlink target is not found in priv_init queue. It was * already completed and its results is/was going to be sent by a * CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only * return the completeness of this unlink request to vhci_hcd. */ stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0); spin_unlock_irqrestore(&sdev->priv_lock, flags); return 0; }