1/* 2 * Copyright (C) 2003-2008 Takahiro Hirofuchi 3 * 4 * This is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 17 * USA. 18 */ 19 20#include <linux/slab.h> 21 22#include "usbip_common.h" 23#include "vhci.h" 24 25 26/* get URB from transmitted urb queue */ 27static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, 28 __u32 seqnum) 29{ 30 struct vhci_priv *priv, *tmp; 31 struct urb *urb = NULL; 32 int status; 33 34 spin_lock(&vdev->priv_lock); 35 36 list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { 37 if (priv->seqnum == seqnum) { 38 urb = priv->urb; 39 status = urb->status; 40 41 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", 42 urb, priv, seqnum); 43 44 /* TODO: fix logic here to improve indent situtation */ 45 if (status != -EINPROGRESS) { 46 if (status == -ENOENT || 47 status == -ECONNRESET) 48 dev_info(&urb->dev->dev, 49 "urb %p was unlinked " 50 "%ssynchronuously.\n", urb, 51 status == -ENOENT ? "" : "a"); 52 else 53 dev_info(&urb->dev->dev, 54 "urb %p may be in a error, " 55 "status %d\n", urb, status); 56 } 57 58 list_del(&priv->list); 59 kfree(priv); 60 urb->hcpriv = NULL; 61 62 break; 63 } 64 } 65 66 spin_unlock(&vdev->priv_lock); 67 68 return urb; 69} 70 71static void vhci_recv_ret_submit(struct vhci_device *vdev, 72 struct usbip_header *pdu) 73{ 74 struct usbip_device *ud = &vdev->ud; 75 struct urb *urb; 76 77 78 urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); 79 80 81 if (!urb) { 82 usbip_uerr("cannot find a urb of seqnum %u\n", 83 pdu->base.seqnum); 84 usbip_uinfo("max seqnum %d\n", 85 atomic_read(&the_controller->seqnum)); 86 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 87 return; 88 } 89 90 91 /* unpack the pdu to a urb */ 92 usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); 93 94 95 /* recv transfer buffer */ 96 if (usbip_recv_xbuff(ud, urb) < 0) 97 return; 98 99 100 /* recv iso_packet_descriptor */ 101 if (usbip_recv_iso(ud, urb) < 0) 102 return; 103 104 105 if (usbip_dbg_flag_vhci_rx) 106 usbip_dump_urb(urb); 107 108 109 usbip_dbg_vhci_rx("now giveback urb %p\n", urb); 110 111 spin_lock(&the_controller->lock); 112 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); 113 spin_unlock(&the_controller->lock); 114 115 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); 116 117 118 usbip_dbg_vhci_rx("Leave\n"); 119 120 return; 121} 122 123 124static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, 125 struct usbip_header *pdu) 126{ 127 struct vhci_unlink *unlink, *tmp; 128 129 spin_lock(&vdev->priv_lock); 130 131 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { 132 usbip_uinfo("unlink->seqnum %lu\n", unlink->seqnum); 133 if (unlink->seqnum == pdu->base.seqnum) { 134 usbip_dbg_vhci_rx("found pending unlink, %lu\n", 135 unlink->seqnum); 136 list_del(&unlink->list); 137 138 spin_unlock(&vdev->priv_lock); 139 return unlink; 140 } 141 } 142 143 spin_unlock(&vdev->priv_lock); 144 145 return NULL; 146} 147 148 149static void vhci_recv_ret_unlink(struct vhci_device *vdev, 150 struct usbip_header *pdu) 151{ 152 struct vhci_unlink *unlink; 153 struct urb *urb; 154 155 usbip_dump_header(pdu); 156 157 unlink = dequeue_pending_unlink(vdev, pdu); 158 if (!unlink) { 159 usbip_uinfo("cannot find the pending unlink %u\n", 160 pdu->base.seqnum); 161 return; 162 } 163 164 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); 165 if (!urb) { 166 /* 167 * I get the result of a unlink request. But, it seems that I 168 * already received the result of its submit result and gave 169 * back the URB. 170 */ 171 usbip_uinfo("the urb (seqnum %d) was already given backed\n", 172 pdu->base.seqnum); 173 } else { 174 usbip_dbg_vhci_rx("now giveback urb %p\n", urb); 175 176 /* If unlink is succeed, status is -ECONNRESET */ 177 urb->status = pdu->u.ret_unlink.status; 178 usbip_uinfo("%d\n", urb->status); 179 180 spin_lock(&the_controller->lock); 181 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); 182 spin_unlock(&the_controller->lock); 183 184 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, 185 urb->status); 186 } 187 188 kfree(unlink); 189 190 return; 191} 192 193/* recv a pdu */ 194static void vhci_rx_pdu(struct usbip_device *ud) 195{ 196 int ret; 197 struct usbip_header pdu; 198 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); 199 200 201 usbip_dbg_vhci_rx("Enter\n"); 202 203 memset(&pdu, 0, sizeof(pdu)); 204 205 206 /* 1. receive a pdu header */ 207 ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0); 208 if (ret != sizeof(pdu)) { 209 usbip_uerr("receiving pdu failed! size is %d, should be %d\n", 210 ret, (unsigned int)sizeof(pdu)); 211 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 212 return; 213 } 214 215 usbip_header_correct_endian(&pdu, 0); 216 217 if (usbip_dbg_flag_vhci_rx) 218 usbip_dump_header(&pdu); 219 220 switch (pdu.base.command) { 221 case USBIP_RET_SUBMIT: 222 vhci_recv_ret_submit(vdev, &pdu); 223 break; 224 case USBIP_RET_UNLINK: 225 vhci_recv_ret_unlink(vdev, &pdu); 226 break; 227 default: 228 /* NOTREACHED */ 229 usbip_uerr("unknown pdu %u\n", pdu.base.command); 230 usbip_dump_header(&pdu); 231 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); 232 } 233} 234 235 236/*-------------------------------------------------------------------------*/ 237 238void vhci_rx_loop(struct usbip_task *ut) 239{ 240 struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx); 241 242 243 while (1) { 244 if (signal_pending(current)) { 245 usbip_dbg_vhci_rx("signal catched!\n"); 246 break; 247 } 248 249 250 if (usbip_event_happened(ud)) 251 break; 252 253 vhci_rx_pdu(ud); 254 } 255} 256