vhci_tx.c 5.9 KB

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