/* * Copyright (C) 2003-2008 Takahiro Hirofuchi * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */ #include #include #include "usbip_common.h" #include "vhci.h" /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */ struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum) { struct vhci_priv *priv, *tmp; struct urb *urb = NULL; int status; list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { if (priv->seqnum == seqnum) { urb = priv->urb; status = urb->status; usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", urb, priv, seqnum); /* TODO: fix logic here to improve indent situtation */ if (status != -EINPROGRESS) { if (status == -ENOENT || status == -ECONNRESET) dev_info(&urb->dev->dev, "urb %p was unlinked " "%ssynchronuously.\n", urb, status == -ENOENT ? "" : "a"); else dev_info(&urb->dev->dev, "urb %p may be in a error, " "status %d\n", urb, status); } list_del(&priv->list); kfree(priv); urb->hcpriv = NULL; break; } } return urb; } static void vhci_recv_ret_submit(struct vhci_device *vdev, struct usbip_header *pdu) { struct usbip_device *ud = &vdev->ud; struct urb *urb; unsigned long flags; spin_lock(&vdev->priv_lock); urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); spin_unlock(&vdev->priv_lock); if (!urb) { pr_err("cannot find a urb of seqnum %u\n", pdu->base.seqnum); pr_info("max seqnum %d\n", atomic_read(&the_controller->seqnum)); usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); return; } /* unpack the pdu to a urb */ usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); /* recv transfer buffer */ if (usbip_recv_xbuff(ud, urb) < 0) return; /* recv iso_packet_descriptor */ if (usbip_recv_iso(ud, urb) < 0) return; /* restore the padding in iso packets */ if (usbip_pad_iso(ud, urb) < 0) return; if (usbip_dbg_flag_vhci_rx) usbip_dump_urb(urb); usbip_dbg_vhci_rx("now giveback urb %p\n", urb); spin_lock_irqsave(&the_controller->lock, flags); usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); spin_unlock_irqrestore(&the_controller->lock, flags); usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); usbip_dbg_vhci_rx("Leave\n"); return; } static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, struct usbip_header *pdu) { struct vhci_unlink *unlink, *tmp; spin_lock(&vdev->priv_lock); list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { pr_info("unlink->seqnum %lu\n", unlink->seqnum); if (unlink->seqnum == pdu->base.seqnum) { usbip_dbg_vhci_rx("found pending unlink, %lu\n", unlink->seqnum); list_del(&unlink->list); spin_unlock(&vdev->priv_lock); return unlink; } } spin_unlock(&vdev->priv_lock); return NULL; } static void vhci_recv_ret_unlink(struct vhci_device *vdev, struct usbip_header *pdu) { struct vhci_unlink *unlink; struct urb *urb; unsigned long flags; usbip_dump_header(pdu); unlink = dequeue_pending_unlink(vdev, pdu); if (!unlink) { pr_info("cannot find the pending unlink %u\n", pdu->base.seqnum); return; } spin_lock(&vdev->priv_lock); urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); spin_unlock(&vdev->priv_lock); if (!urb) { /* * I get the result of a unlink request. But, it seems that I * already received the result of its submit result and gave * back the URB. */ pr_info("the urb (seqnum %d) was already given backed\n", pdu->base.seqnum); } else { usbip_dbg_vhci_rx("now giveback urb %p\n", urb); /* If unlink is succeed, status is -ECONNRESET */ urb->status = pdu->u.ret_unlink.status; pr_info("urb->status %d\n", urb->status); spin_lock_irqsave(&the_controller->lock, flags); usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); spin_unlock_irqrestore(&the_controller->lock, flags); usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); } kfree(unlink); } static int vhci_priv_tx_empty(struct vhci_device *vdev) { int empty = 0; spin_lock(&vdev->priv_lock); empty = list_empty(&vdev->priv_rx); spin_unlock(&vdev->priv_lock); return empty; } /* recv a pdu */ static void vhci_rx_pdu(struct usbip_device *ud) { int ret; struct usbip_header pdu; struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); usbip_dbg_vhci_rx("Enter\n"); memset(&pdu, 0, sizeof(pdu)); /* 1. receive a pdu header */ ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu)); if (ret < 0) { if (ret == -ECONNRESET) pr_info("connection reset by peer\n"); else if (ret == -EAGAIN) { /* ignore if connection was idle */ if (vhci_priv_tx_empty(vdev)) return; pr_info("connection timed out with pending urbs\n"); } else if (ret != -ERESTARTSYS) pr_info("xmit failed %d\n", ret); usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); return; } if (ret == 0) { pr_info("connection closed"); usbip_event_add(ud, VDEV_EVENT_DOWN); return; } if (ret != sizeof(pdu)) { pr_err("received pdu size is %d, should be %d\n", ret, (unsigned int)sizeof(pdu)); usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); return; } usbip_header_correct_endian(&pdu, 0); if (usbip_dbg_flag_vhci_rx) usbip_dump_header(&pdu); switch (pdu.base.command) { case USBIP_RET_SUBMIT: vhci_recv_ret_submit(vdev, &pdu); break; case USBIP_RET_UNLINK: vhci_recv_ret_unlink(vdev, &pdu); break; default: /* NOT REACHED */ pr_err("unknown pdu %u\n", pdu.base.command); usbip_dump_header(&pdu); usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); break; } } int vhci_rx_loop(void *data) { struct usbip_device *ud = data; while (!kthread_should_stop()) { if (usbip_event_happened(ud)) break; vhci_rx_pdu(ud); } return 0; }