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Linux/drivers/staging/usbip/vhci_sysfs.c

  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/kthread.h>
 21 #include <linux/net.h>
 22 
 23 #include "usbip_common.h"
 24 #include "vhci.h"
 25 
 26 /* TODO: refine locking ?*/
 27 
 28 /* Sysfs entry to show port status */
 29 static ssize_t show_status(struct device *dev, struct device_attribute *attr,
 30                            char *out)
 31 {
 32         char *s = out;
 33         int i = 0;
 34 
 35         BUG_ON(!the_controller || !out);
 36 
 37         spin_lock(&the_controller->lock);
 38 
 39         /*
 40          * output example:
 41          * prt sta spd dev socket           local_busid
 42          * 000 004 000 000         c5a7bb80 1-2.3
 43          * 001 004 000 000         d8cee980 2-3.4
 44          *
 45          * IP address can be retrieved from a socket pointer address by looking
 46          * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a
 47          * port number and its peer IP address.
 48          */
 49         out += sprintf(out, "prt sta spd bus dev socket           "
 50                        "local_busid\n");
 51 
 52         for (i = 0; i < VHCI_NPORTS; i++) {
 53                 struct vhci_device *vdev = port_to_vdev(i);
 54 
 55                 spin_lock(&vdev->ud.lock);
 56                 out += sprintf(out, "%03u %03u ", i, vdev->ud.status);
 57 
 58                 if (vdev->ud.status == VDEV_ST_USED) {
 59                         out += sprintf(out, "%03u %08x ",
 60                                        vdev->speed, vdev->devid);
 61                         out += sprintf(out, "%16p ", vdev->ud.tcp_socket);
 62                         out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
 63 
 64                 } else {
 65                         out += sprintf(out, "000 000 000 0000000000000000 0-0");
 66                 }
 67 
 68                 out += sprintf(out, "\n");
 69                 spin_unlock(&vdev->ud.lock);
 70         }
 71 
 72         spin_unlock(&the_controller->lock);
 73 
 74         return out - s;
 75 }
 76 static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
 77 
 78 /* Sysfs entry to shutdown a virtual connection */
 79 static int vhci_port_disconnect(__u32 rhport)
 80 {
 81         struct vhci_device *vdev;
 82 
 83         usbip_dbg_vhci_sysfs("enter\n");
 84 
 85         /* lock */
 86         spin_lock(&the_controller->lock);
 87 
 88         vdev = port_to_vdev(rhport);
 89 
 90         spin_lock(&vdev->ud.lock);
 91         if (vdev->ud.status == VDEV_ST_NULL) {
 92                 pr_err("not connected %d\n", vdev->ud.status);
 93 
 94                 /* unlock */
 95                 spin_unlock(&vdev->ud.lock);
 96                 spin_unlock(&the_controller->lock);
 97 
 98                 return -EINVAL;
 99         }
100 
101         /* unlock */
102         spin_unlock(&vdev->ud.lock);
103         spin_unlock(&the_controller->lock);
104 
105         usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
106 
107         return 0;
108 }
109 
110 static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
111                             const char *buf, size_t count)
112 {
113         int err;
114         __u32 rhport = 0;
115 
116         sscanf(buf, "%u", &rhport);
117 
118         /* check rhport */
119         if (rhport >= VHCI_NPORTS) {
120                 dev_err(dev, "invalid port %u\n", rhport);
121                 return -EINVAL;
122         }
123 
124         err = vhci_port_disconnect(rhport);
125         if (err < 0)
126                 return -EINVAL;
127 
128         usbip_dbg_vhci_sysfs("Leave\n");
129 
130         return count;
131 }
132 static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);
133 
134 /* Sysfs entry to establish a virtual connection */
135 static int valid_args(__u32 rhport, enum usb_device_speed speed)
136 {
137         /* check rhport */
138         if (rhport >= VHCI_NPORTS) {
139                 pr_err("port %u\n", rhport);
140                 return -EINVAL;
141         }
142 
143         /* check speed */
144         switch (speed) {
145         case USB_SPEED_LOW:
146         case USB_SPEED_FULL:
147         case USB_SPEED_HIGH:
148         case USB_SPEED_WIRELESS:
149                 break;
150         default:
151                 pr_err("speed %d\n", speed);
152                 return -EINVAL;
153         }
154 
155         return 0;
156 }
157 
158 /*
159  * To start a new USB/IP attachment, a userland program needs to setup a TCP
160  * connection and then write its socket descriptor with remote device
161  * information into this sysfs file.
162  *
163  * A remote device is virtually attached to the root-hub port of @rhport with
164  * @speed. @devid is embedded into a request to specify the remote device in a
165  * server host.
166  *
167  * write() returns 0 on success, else negative errno.
168  */
169 static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
170                             const char *buf, size_t count)
171 {
172         struct vhci_device *vdev;
173         struct socket *socket;
174         int sockfd = 0;
175         __u32 rhport = 0, devid = 0, speed = 0;
176 
177         /*
178          * @rhport: port number of vhci_hcd
179          * @sockfd: socket descriptor of an established TCP connection
180          * @devid: unique device identifier in a remote host
181          * @speed: usb device speed in a remote host
182          */
183         sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed);
184 
185         usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n",
186                              rhport, sockfd, devid, speed);
187 
188         /* check received parameters */
189         if (valid_args(rhport, speed) < 0)
190                 return -EINVAL;
191 
192         /* check sockfd */
193         socket = sockfd_to_socket(sockfd);
194         if (!socket)
195                 return -EINVAL;
196 
197         /* now need lock until setting vdev status as used */
198 
199         /* begin a lock */
200         spin_lock(&the_controller->lock);
201         vdev = port_to_vdev(rhport);
202         spin_lock(&vdev->ud.lock);
203 
204         if (vdev->ud.status != VDEV_ST_NULL) {
205                 /* end of the lock */
206                 spin_unlock(&vdev->ud.lock);
207                 spin_unlock(&the_controller->lock);
208 
209                 dev_err(dev, "port %d already used\n", rhport);
210                 return -EINVAL;
211         }
212 
213         dev_info(dev, "rhport(%u) sockfd(%d) devid(%u) speed(%u)\n",
214                  rhport, sockfd, devid, speed);
215 
216         vdev->devid         = devid;
217         vdev->speed         = speed;
218         vdev->ud.tcp_socket = socket;
219         vdev->ud.status     = VDEV_ST_NOTASSIGNED;
220 
221         spin_unlock(&vdev->ud.lock);
222         spin_unlock(&the_controller->lock);
223         /* end the lock */
224 
225         vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
226         vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
227 
228         rh_port_connect(rhport, speed);
229 
230         return count;
231 }
232 static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach);
233 
234 static struct attribute *dev_attrs[] = {
235         &dev_attr_status.attr,
236         &dev_attr_detach.attr,
237         &dev_attr_attach.attr,
238         &dev_attr_usbip_debug.attr,
239         NULL,
240 };
241 
242 const struct attribute_group dev_attr_group = {
243         .attrs = dev_attrs,
244 };
245 

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