drivers/usb/usbip/vhci_tx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   4  */
   5
   6 #include <linux/kthread.h>
   7 #include <linux/slab.h>
   8
   9 #include "usbip_common.h"
  10 #include "vhci.h"
  11
  12 static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
  13 {
  14         struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
  15         struct vhci_device *vdev = priv->vdev;
  16
  17         usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
  18                           usb_pipedevice(urb->pipe), vdev->devid);
  19
  20         pdup->base.command   = USBIP_CMD_SUBMIT;
  21         pdup->base.seqnum    = priv->seqnum;
  22         pdup->base.devid     = vdev->devid;
  23         pdup->base.direction = usb_pipein(urb->pipe) ?
  24                 USBIP_DIR_IN : USBIP_DIR_OUT;
  25         pdup->base.ep        = usb_pipeendpoint(urb->pipe);
  26
  27         usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);
  28
  29         if (urb->setup_packet)
  30                 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
  31 }
  32
  33 static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
  34 {
  35         struct vhci_priv *priv, *tmp;
  36         unsigned long flags;
  37
  38         spin_lock_irqsave(&vdev->priv_lock, flags);
  39
  40         list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
  41                 list_move_tail(&priv->list, &vdev->priv_rx);
  42                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
  43                 return priv;
  44         }
  45
  46         spin_unlock_irqrestore(&vdev->priv_lock, flags);
  47
  48         return NULL;
  49 }
  50
  51 static int vhci_send_cmd_submit(struct vhci_device *vdev)
  52 {
  53         struct vhci_priv *priv = NULL;
  54
  55         struct msghdr msg;
  56         struct kvec iov[3];
  57         size_t txsize;
  58
  59         size_t total_size = 0;
  60
  61         while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
  62                 int ret;
  63                 struct urb *urb = priv->urb;
  64                 struct usbip_header pdu_header;
  65                 struct usbip_iso_packet_descriptor *iso_buffer = NULL;
  66
  67                 txsize = 0;
  68                 memset(&pdu_header, 0, sizeof(pdu_header));
  69                 memset(&msg, 0, sizeof(msg));
  70                 memset(&iov, 0, sizeof(iov));
  71
  72                 usbip_dbg_vhci_tx("setup txdata urb seqnum %lu\n",
  73                                   priv->seqnum);
  74
  75                 /* 1. setup usbip_header */
  76                 setup_cmd_submit_pdu(&pdu_header, urb);
  77                 usbip_header_correct_endian(&pdu_header, 1);
  78
  79                 iov[0].iov_base = &pdu_header;
  80                 iov[0].iov_len  = sizeof(pdu_header);
  81                 txsize += sizeof(pdu_header);
  82
  83                 /* 2. setup transfer buffer */
  84                 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
  85                         iov[1].iov_base = urb->transfer_buffer;
  86                         iov[1].iov_len  = urb->transfer_buffer_length;
  87                         txsize += urb->transfer_buffer_length;
  88                 }
  89
  90                 /* 3. setup iso_packet_descriptor */
  91                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
  92                         ssize_t len = 0;
  93
  94                         iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
  95                         if (!iso_buffer) {
  96                                 usbip_event_add(&vdev->ud,
  97                                                 SDEV_EVENT_ERROR_MALLOC);
  98                                 return -1;
  99                         }
 100
 101                         iov[2].iov_base = iso_buffer;
 102                         iov[2].iov_len  = len;
 103                         txsize += len;
 104                 }
 105
 106                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
 107                 if (ret != txsize) {
 108                         pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
 109                                txsize);
 110                         kfree(iso_buffer);
 111                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 112                         return -1;
 113                 }
 114
 115                 kfree(iso_buffer);
 116                 usbip_dbg_vhci_tx("send txdata\n");
 117
 118                 total_size += txsize;
 119         }
 120
 121         return total_size;
 122 }
 123
 124 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
 125 {
 126         struct vhci_unlink *unlink, *tmp;
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&vdev->priv_lock, flags);
 130
 131         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 132                 list_move_tail(&unlink->list, &vdev->unlink_rx);
 133                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
 134                 return unlink;
 135         }
 136
 137         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 138
 139         return NULL;
 140 }
 141
 142 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
 143 {
 144         struct vhci_unlink *unlink = NULL;
 145
 146         struct msghdr msg;
 147         struct kvec iov;
 148         size_t txsize;
 149         size_t total_size = 0;
 150
 151         while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
 152                 int ret;
 153                 struct usbip_header pdu_header;
 154
 155                 memset(&pdu_header, 0, sizeof(pdu_header));
 156                 memset(&msg, 0, sizeof(msg));
 157                 memset(&iov, 0, sizeof(iov));
 158
 159                 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
 160
 161                 /* 1. setup usbip_header */
 162                 pdu_header.base.command = USBIP_CMD_UNLINK;
 163                 pdu_header.base.seqnum  = unlink->seqnum;
 164                 pdu_header.base.devid   = vdev->devid;
 165                 pdu_header.base.ep      = 0;
 166                 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
 167
 168                 usbip_header_correct_endian(&pdu_header, 1);
 169
 170                 iov.iov_base = &pdu_header;
 171                 iov.iov_len  = sizeof(pdu_header);
 172                 txsize = sizeof(pdu_header);
 173
 174                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, &iov, 1, txsize);
 175                 if (ret != txsize) {
 176                         pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
 177                                txsize);
 178                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 179                         return -1;
 180                 }
 181
 182                 usbip_dbg_vhci_tx("send txdata\n");
 183
 184                 total_size += txsize;
 185         }
 186
 187         return total_size;
 188 }
 189
 190 int vhci_tx_loop(void *data)
 191 {
 192         struct usbip_device *ud = data;
 193         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 194
 195         while (!kthread_should_stop()) {
 196                 if (vhci_send_cmd_submit(vdev) < 0)
 197                         break;
 198
 199                 if (vhci_send_cmd_unlink(vdev) < 0)
 200                         break;
 201
 202                 wait_event_interruptible(vdev->waitq_tx,
 203                                          (!list_empty(&vdev->priv_tx) ||
 204                                           !list_empty(&vdev->unlink_tx) ||
 205                                           kthread_should_stop()));
 206
 207                 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 208         }
 209
 210         return 0;
 211 }