| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2015 Karol Kosik <karo9@interia.eu> |
| * Copyright (C) 2015-2016 Samsung Electronics |
| * Igor Kotrasinski <i.kotrasinsk@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <net/sock.h> |
| #include <linux/list.h> |
| #include <linux/kthread.h> |
| |
| #include "usbip_common.h" |
| #include "vudc.h" |
| |
| static inline void setup_base_pdu(struct usbip_header_basic *base, |
| __u32 command, __u32 seqnum) |
| { |
| base->command = command; |
| base->seqnum = seqnum; |
| base->devid = 0; |
| base->ep = 0; |
| base->direction = 0; |
| } |
| |
| static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urbp *urb_p) |
| { |
| setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, urb_p->seqnum); |
| usbip_pack_pdu(rpdu, urb_p->urb, USBIP_RET_SUBMIT, 1); |
| } |
| |
| static void setup_ret_unlink_pdu(struct usbip_header *rpdu, |
| struct v_unlink *unlink) |
| { |
| setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum); |
| rpdu->u.ret_unlink.status = unlink->status; |
| } |
| |
| static int v_send_ret_unlink(struct vudc *udc, struct v_unlink *unlink) |
| { |
| struct msghdr msg; |
| struct kvec iov[1]; |
| size_t txsize; |
| |
| int ret; |
| struct usbip_header pdu_header; |
| |
| txsize = 0; |
| memset(&pdu_header, 0, sizeof(pdu_header)); |
| memset(&msg, 0, sizeof(msg)); |
| memset(&iov, 0, sizeof(iov)); |
| |
| /* 1. setup usbip_header */ |
| setup_ret_unlink_pdu(&pdu_header, unlink); |
| usbip_header_correct_endian(&pdu_header, 1); |
| |
| iov[0].iov_base = &pdu_header; |
| iov[0].iov_len = sizeof(pdu_header); |
| txsize += sizeof(pdu_header); |
| |
| ret = kernel_sendmsg(udc->ud.tcp_socket, &msg, iov, |
| 1, txsize); |
| if (ret != txsize) { |
| usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP); |
| if (ret >= 0) |
| return -EPIPE; |
| return ret; |
| } |
| kfree(unlink); |
| |
| return txsize; |
| } |
| |
| static int v_send_ret_submit(struct vudc *udc, struct urbp *urb_p) |
| { |
| struct urb *urb = urb_p->urb; |
| struct usbip_header pdu_header; |
| struct usbip_iso_packet_descriptor *iso_buffer = NULL; |
| struct kvec *iov = NULL; |
| int iovnum = 0; |
| int ret = 0; |
| size_t txsize; |
| struct msghdr msg; |
| |
| txsize = 0; |
| memset(&pdu_header, 0, sizeof(pdu_header)); |
| memset(&msg, 0, sizeof(msg)); |
| |
| if (urb->actual_length > 0 && !urb->transfer_buffer) { |
| dev_err(&udc->gadget.dev, |
| "urb: actual_length %d transfer_buffer null\n", |
| urb->actual_length); |
| return -1; |
| } |
| |
| if (urb_p->type == USB_ENDPOINT_XFER_ISOC) |
| iovnum = 2 + urb->number_of_packets; |
| else |
| iovnum = 2; |
| |
| iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL); |
| if (!iov) { |
| usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC); |
| ret = -ENOMEM; |
| goto out; |
| } |
| iovnum = 0; |
| |
| /* 1. setup usbip_header */ |
| setup_ret_submit_pdu(&pdu_header, urb_p); |
| usbip_dbg_stub_tx("setup txdata seqnum: %d\n", |
| pdu_header.base.seqnum); |
| usbip_header_correct_endian(&pdu_header, 1); |
| |
| iov[iovnum].iov_base = &pdu_header; |
| iov[iovnum].iov_len = sizeof(pdu_header); |
| iovnum++; |
| txsize += sizeof(pdu_header); |
| |
| /* 2. setup transfer buffer */ |
| if (urb_p->type != USB_ENDPOINT_XFER_ISOC && |
| usb_pipein(urb->pipe) && urb->actual_length > 0) { |
| iov[iovnum].iov_base = urb->transfer_buffer; |
| iov[iovnum].iov_len = urb->actual_length; |
| iovnum++; |
| txsize += urb->actual_length; |
| } else if (urb_p->type == USB_ENDPOINT_XFER_ISOC && |
| usb_pipein(urb->pipe)) { |
| /* FIXME - copypasted from stub_tx, refactor */ |
| int i; |
| |
| for (i = 0; i < urb->number_of_packets; i++) { |
| iov[iovnum].iov_base = urb->transfer_buffer + |
| urb->iso_frame_desc[i].offset; |
| iov[iovnum].iov_len = |
| urb->iso_frame_desc[i].actual_length; |
| iovnum++; |
| txsize += urb->iso_frame_desc[i].actual_length; |
| } |
| |
| if (txsize != sizeof(pdu_header) + urb->actual_length) { |
| usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP); |
| ret = -EPIPE; |
| goto out; |
| } |
| } |
| /* else - no buffer to send */ |
| |
| /* 3. setup iso_packet_descriptor */ |
| if (urb_p->type == USB_ENDPOINT_XFER_ISOC) { |
| ssize_t len = 0; |
| |
| iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); |
| if (!iso_buffer) { |
| usbip_event_add(&udc->ud, |
| VUDC_EVENT_ERROR_MALLOC); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| iov[iovnum].iov_base = iso_buffer; |
| iov[iovnum].iov_len = len; |
| txsize += len; |
| iovnum++; |
| } |
| |
| ret = kernel_sendmsg(udc->ud.tcp_socket, &msg, |
| iov, iovnum, txsize); |
| if (ret != txsize) { |
| usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP); |
| if (ret >= 0) |
| ret = -EPIPE; |
| goto out; |
| } |
| |
| out: |
| kfree(iov); |
| kfree(iso_buffer); |
| free_urbp_and_urb(urb_p); |
| if (ret < 0) |
| return ret; |
| return txsize; |
| } |
| |
| static int v_send_ret(struct vudc *udc) |
| { |
| unsigned long flags; |
| struct tx_item *txi; |
| size_t total_size = 0; |
| int ret = 0; |
| |
| spin_lock_irqsave(&udc->lock_tx, flags); |
| while (!list_empty(&udc->tx_queue)) { |
| txi = list_first_entry(&udc->tx_queue, struct tx_item, |
| tx_entry); |
| list_del(&txi->tx_entry); |
| spin_unlock_irqrestore(&udc->lock_tx, flags); |
| |
| switch (txi->type) { |
| case TX_SUBMIT: |
| ret = v_send_ret_submit(udc, txi->s); |
| break; |
| case TX_UNLINK: |
| ret = v_send_ret_unlink(udc, txi->u); |
| break; |
| } |
| kfree(txi); |
| |
| if (ret < 0) |
| return ret; |
| |
| total_size += ret; |
| |
| spin_lock_irqsave(&udc->lock_tx, flags); |
| } |
| |
| spin_unlock_irqrestore(&udc->lock_tx, flags); |
| return total_size; |
| } |
| |
| |
| int v_tx_loop(void *data) |
| { |
| struct usbip_device *ud = (struct usbip_device *) data; |
| struct vudc *udc = container_of(ud, struct vudc, ud); |
| int ret; |
| |
| while (!kthread_should_stop()) { |
| if (usbip_event_happened(&udc->ud)) |
| break; |
| ret = v_send_ret(udc); |
| if (ret < 0) { |
| pr_warn("v_tx exit with error %d", ret); |
| break; |
| } |
| wait_event_interruptible(udc->tx_waitq, |
| (!list_empty(&udc->tx_queue) || |
| kthread_should_stop())); |
| } |
| |
| return 0; |
| } |
| |
| /* called with spinlocks held */ |
| void v_enqueue_ret_unlink(struct vudc *udc, __u32 seqnum, __u32 status) |
| { |
| struct tx_item *txi; |
| struct v_unlink *unlink; |
| |
| txi = kzalloc(sizeof(*txi), GFP_ATOMIC); |
| if (!txi) { |
| usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC); |
| return; |
| } |
| unlink = kzalloc(sizeof(*unlink), GFP_ATOMIC); |
| if (!unlink) { |
| kfree(txi); |
| usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC); |
| return; |
| } |
| |
| unlink->seqnum = seqnum; |
| unlink->status = status; |
| txi->type = TX_UNLINK; |
| txi->u = unlink; |
| |
| list_add_tail(&txi->tx_entry, &udc->tx_queue); |
| } |
| |
| /* called with spinlocks held */ |
| void v_enqueue_ret_submit(struct vudc *udc, struct urbp *urb_p) |
| { |
| struct tx_item *txi; |
| |
| txi = kzalloc(sizeof(*txi), GFP_ATOMIC); |
| if (!txi) { |
| usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC); |
| return; |
| } |
| |
| txi->type = TX_SUBMIT; |
| txi->s = urb_p; |
| |
| list_add_tail(&txi->tx_entry, &udc->tx_queue); |
| } |