drivers/usb/usbip/vudc_tx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
   4  * Copyright (C) 2015-2016 Samsung Electronics
   5  *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
   6  */
   7
   8 #include <net/sock.h>
   9 #include <linux/list.h>
  10 #include <linux/kthread.h>
  11
  12 #include "usbip_common.h"
  13 #include "vudc.h"
  14
  15 static inline void setup_base_pdu(struct usbip_header_basic *base,
  16                                   __u32 command, __u32 seqnum)
  17 {
  18         base->command   = command;
  19         base->seqnum    = seqnum;
  20         base->devid     = 0;
  21         base->ep        = 0;
  22         base->direction = 0;
  23 }
  24
  25 static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urbp *urb_p)
  26 {
  27         setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, urb_p->seqnum);
  28         usbip_pack_pdu(rpdu, urb_p->urb, USBIP_RET_SUBMIT, 1);
  29 }
  30
  31 static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
  32                                  struct v_unlink *unlink)
  33 {
  34         setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
  35         rpdu->u.ret_unlink.status = unlink->status;
  36 }
  37
  38 static int v_send_ret_unlink(struct vudc *udc, struct v_unlink *unlink)
  39 {
  40         struct msghdr msg;
  41         struct kvec iov[1];
  42         size_t txsize;
  43
  44         int ret;
  45         struct usbip_header pdu_header;
  46
  47         txsize = 0;
  48         memset(&pdu_header, 0, sizeof(pdu_header));
  49         memset(&msg, 0, sizeof(msg));
  50         memset(&iov, 0, sizeof(iov));
  51
  52         /* 1. setup usbip_header */
  53         setup_ret_unlink_pdu(&pdu_header, unlink);
  54         usbip_header_correct_endian(&pdu_header, 1);
  55
  56         iov[0].iov_base = &pdu_header;
  57         iov[0].iov_len  = sizeof(pdu_header);
  58         txsize += sizeof(pdu_header);
  59
  60         ret = kernel_sendmsg(udc->ud.tcp_socket, &msg, iov,
  61                              1, txsize);
  62         if (ret != txsize) {
  63                 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
  64                 if (ret >= 0)
  65                         return -EPIPE;
  66                 return ret;
  67         }
  68         kfree(unlink);
  69
  70         return txsize;
  71 }
  72
  73 static int v_send_ret_submit(struct vudc *udc, struct urbp *urb_p)
  74 {
  75         struct urb *urb = urb_p->urb;
  76         struct usbip_header pdu_header;
  77         struct usbip_iso_packet_descriptor *iso_buffer = NULL;
  78         struct kvec *iov = NULL;
  79         int iovnum = 0;
  80         int ret = 0;
  81         size_t txsize;
  82         struct msghdr msg;
  83
  84         txsize = 0;
  85         memset(&pdu_header, 0, sizeof(pdu_header));
  86         memset(&msg, 0, sizeof(msg));
  87
  88         if (urb->actual_length > 0 && !urb->transfer_buffer) {
  89                 dev_err(&udc->gadget.dev,
  90                         "urb: actual_length %d transfer_buffer null\n",
  91                         urb->actual_length);
  92                 return -1;
  93         }
  94
  95         if (urb_p->type == USB_ENDPOINT_XFER_ISOC)
  96                 iovnum = 2 + urb->number_of_packets;
  97         else
  98                 iovnum = 2;
  99
 100         iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL);
 101         if (!iov) {
 102                 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
 103                 ret = -ENOMEM;
 104                 goto out;
 105         }
 106         iovnum = 0;
 107
 108         /* 1. setup usbip_header */
 109         setup_ret_submit_pdu(&pdu_header, urb_p);
 110         usbip_dbg_stub_tx("setup txdata seqnum: %d\n",
 111                           pdu_header.base.seqnum);
 112         usbip_header_correct_endian(&pdu_header, 1);
 113
 114         iov[iovnum].iov_base = &pdu_header;
 115         iov[iovnum].iov_len  = sizeof(pdu_header);
 116         iovnum++;
 117         txsize += sizeof(pdu_header);
 118
 119         /* 2. setup transfer buffer */
 120         if (urb_p->type != USB_ENDPOINT_XFER_ISOC &&
 121             usb_pipein(urb->pipe) && urb->actual_length > 0) {
 122                 iov[iovnum].iov_base = urb->transfer_buffer;
 123                 iov[iovnum].iov_len  = urb->actual_length;
 124                 iovnum++;
 125                 txsize += urb->actual_length;
 126         } else if (urb_p->type == USB_ENDPOINT_XFER_ISOC &&
 127                 usb_pipein(urb->pipe)) {
 128                 /* FIXME - copypasted from stub_tx, refactor */
 129                 int i;
 130
 131                 for (i = 0; i < urb->number_of_packets; i++) {
 132                         iov[iovnum].iov_base = urb->transfer_buffer +
 133                                 urb->iso_frame_desc[i].offset;
 134                         iov[iovnum].iov_len =
 135                                 urb->iso_frame_desc[i].actual_length;
 136                         iovnum++;
 137                         txsize += urb->iso_frame_desc[i].actual_length;
 138                 }
 139
 140                 if (txsize != sizeof(pdu_header) + urb->actual_length) {
 141                         usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
 142                         ret = -EPIPE;
 143                         goto out;
 144                 }
 145         }
 146         /* else - no buffer to send */
 147
 148         /* 3. setup iso_packet_descriptor */
 149         if (urb_p->type == USB_ENDPOINT_XFER_ISOC) {
 150                 ssize_t len = 0;
 151
 152                 iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
 153                 if (!iso_buffer) {
 154                         usbip_event_add(&udc->ud,
 155                                         VUDC_EVENT_ERROR_MALLOC);
 156                         ret = -ENOMEM;
 157                         goto out;
 158                 }
 159
 160                 iov[iovnum].iov_base = iso_buffer;
 161                 iov[iovnum].iov_len  = len;
 162                 txsize += len;
 163                 iovnum++;
 164         }
 165
 166         ret = kernel_sendmsg(udc->ud.tcp_socket, &msg,
 167                                                 iov,  iovnum, txsize);
 168         if (ret != txsize) {
 169                 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
 170                 if (ret >= 0)
 171                         ret = -EPIPE;
 172                 goto out;
 173         }
 174
 175 out:
 176         kfree(iov);
 177         kfree(iso_buffer);
 178         free_urbp_and_urb(urb_p);
 179         if (ret < 0)
 180                 return ret;
 181         return txsize;
 182 }
 183
 184 static int v_send_ret(struct vudc *udc)
 185 {
 186         unsigned long flags;
 187         struct tx_item *txi;
 188         size_t total_size = 0;
 189         int ret = 0;
 190
 191         spin_lock_irqsave(&udc->lock_tx, flags);
 192         while (!list_empty(&udc->tx_queue)) {
 193                 txi = list_first_entry(&udc->tx_queue, struct tx_item,
 194                                        tx_entry);
 195                 list_del(&txi->tx_entry);
 196                 spin_unlock_irqrestore(&udc->lock_tx, flags);
 197
 198                 switch (txi->type) {
 199                 case TX_SUBMIT:
 200                         ret = v_send_ret_submit(udc, txi->s);
 201                         break;
 202                 case TX_UNLINK:
 203                         ret = v_send_ret_unlink(udc, txi->u);
 204                         break;
 205                 }
 206                 kfree(txi);
 207
 208                 if (ret < 0)
 209                         return ret;
 210
 211                 total_size += ret;
 212
 213                 spin_lock_irqsave(&udc->lock_tx, flags);
 214         }
 215
 216         spin_unlock_irqrestore(&udc->lock_tx, flags);
 217         return total_size;
 218 }
 219
 220
 221 int v_tx_loop(void *data)
 222 {
 223         struct usbip_device *ud = (struct usbip_device *) data;
 224         struct vudc *udc = container_of(ud, struct vudc, ud);
 225         int ret;
 226
 227         while (!kthread_should_stop()) {
 228                 if (usbip_event_happened(&udc->ud))
 229                         break;
 230                 ret = v_send_ret(udc);
 231                 if (ret < 0) {
 232                         pr_warn("v_tx exit with error %d", ret);
 233                         break;
 234                 }
 235                 wait_event_interruptible(udc->tx_waitq,
 236                                          (!list_empty(&udc->tx_queue) ||
 237                                          kthread_should_stop()));
 238         }
 239
 240         return 0;
 241 }
 242
 243 /* called with spinlocks held */
 244 void v_enqueue_ret_unlink(struct vudc *udc, __u32 seqnum, __u32 status)
 245 {
 246         struct tx_item *txi;
 247         struct v_unlink *unlink;
 248
 249         txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
 250         if (!txi) {
 251                 usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
 252                 return;
 253         }
 254         unlink = kzalloc(sizeof(*unlink), GFP_ATOMIC);
 255         if (!unlink) {
 256                 kfree(txi);
 257                 usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
 258                 return;
 259         }
 260
 261         unlink->seqnum = seqnum;
 262         unlink->status = status;
 263         txi->type = TX_UNLINK;
 264         txi->u = unlink;
 265
 266         list_add_tail(&txi->tx_entry, &udc->tx_queue);
 267 }
 268
 269 /* called with spinlocks held */
 270 void v_enqueue_ret_submit(struct vudc *udc, struct urbp *urb_p)
 271 {
 272         struct tx_item *txi;
 273
 274         txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
 275         if (!txi) {
 276                 usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
 277                 return;
 278         }
 279
 280         txi->type = TX_SUBMIT;
 281         txi->s = urb_p;
 282
 283         list_add_tail(&txi->tx_entry, &udc->tx_queue);
 284 }