| 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 */ |
| 27 | static 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 | |
| 71 | static 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 | |
| 124 | static 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 | |
| 149 | static 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 */ |
| 194 | static 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 | |
| 238 | void 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 | |