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usbip: vudc: Add vudc_tx
This file contains functions for returning requests to the client.
It also has functions that add requests completed in vudc_rx and
vudc_transfer to the return queue.
This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:
Igor Kotrasinski <ikotrasinsk@gmail.com>
Karol Kosik <karo9@interia.eu>
Ewelina Kosmider <3w3lfin@gmail.com>
Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
Piotr Szulc <ps347277@students.mimuw.edu.pl>
Tutor and project owner:
Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: Karol Kosik <karo9@interia.eu>
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Igor Kotrasinski
Greg Kroah-Hartman
parent
abdb295743
commit
d62ba981a9
289
drivers/usb/usbip/vudc_tx.c
Normal file
289
drivers/usb/usbip/vudc_tx.c
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@ -0,0 +1,289 @@
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/*
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* Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
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* Copyright (C) 2015-2016 Samsung Electronics
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* Igor Kotrasinski <i.kotrasinsk@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <net/sock.h>
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#include <linux/list.h>
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#include <linux/kthread.h>
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#include "usbip_common.h"
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#include "vudc.h"
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static inline void setup_base_pdu(struct usbip_header_basic *base,
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__u32 command, __u32 seqnum)
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{
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base->command = command;
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base->seqnum = seqnum;
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base->devid = 0;
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base->ep = 0;
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base->direction = 0;
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}
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static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urbp *urb_p)
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{
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setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, urb_p->seqnum);
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usbip_pack_pdu(rpdu, urb_p->urb, USBIP_RET_SUBMIT, 1);
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}
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static void setup_ret_unlink_pdu(struct usbip_header *rpdu,
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struct v_unlink *unlink)
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{
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setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
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rpdu->u.ret_unlink.status = unlink->status;
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}
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static int v_send_ret_unlink(struct vudc *udc, struct v_unlink *unlink)
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{
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struct msghdr msg;
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struct kvec iov[1];
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size_t txsize;
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int ret;
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struct usbip_header pdu_header;
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txsize = 0;
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memset(&pdu_header, 0, sizeof(pdu_header));
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memset(&msg, 0, sizeof(msg));
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memset(&iov, 0, sizeof(iov));
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/* 1. setup usbip_header */
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setup_ret_unlink_pdu(&pdu_header, unlink);
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usbip_header_correct_endian(&pdu_header, 1);
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iov[0].iov_base = &pdu_header;
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iov[0].iov_len = sizeof(pdu_header);
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txsize += sizeof(pdu_header);
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ret = kernel_sendmsg(udc->ud.tcp_socket, &msg, iov,
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1, txsize);
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if (ret != txsize) {
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usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
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if (ret >= 0)
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return -EPIPE;
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return ret;
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}
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kfree(unlink);
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return txsize;
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}
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static int v_send_ret_submit(struct vudc *udc, struct urbp *urb_p)
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{
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struct urb *urb = urb_p->urb;
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struct usbip_header pdu_header;
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struct usbip_iso_packet_descriptor *iso_buffer = NULL;
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struct kvec *iov = NULL;
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int iovnum = 0;
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int ret = 0;
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size_t txsize;
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struct msghdr msg;
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txsize = 0;
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memset(&pdu_header, 0, sizeof(pdu_header));
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memset(&msg, 0, sizeof(msg));
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if (urb_p->type == USB_ENDPOINT_XFER_ISOC)
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iovnum = 2 + urb->number_of_packets;
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else
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iovnum = 2;
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iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL);
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if (!iov) {
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usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
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ret = -ENOMEM;
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goto out;
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}
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iovnum = 0;
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/* 1. setup usbip_header */
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setup_ret_submit_pdu(&pdu_header, urb_p);
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usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n",
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pdu_header.base.seqnum, urb);
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usbip_header_correct_endian(&pdu_header, 1);
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iov[iovnum].iov_base = &pdu_header;
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iov[iovnum].iov_len = sizeof(pdu_header);
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iovnum++;
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txsize += sizeof(pdu_header);
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/* 2. setup transfer buffer */
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if (urb_p->type != USB_ENDPOINT_XFER_ISOC &&
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usb_pipein(urb->pipe) && urb->actual_length > 0) {
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iov[iovnum].iov_base = urb->transfer_buffer;
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iov[iovnum].iov_len = urb->actual_length;
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iovnum++;
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txsize += urb->actual_length;
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} else if (urb_p->type == USB_ENDPOINT_XFER_ISOC &&
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usb_pipein(urb->pipe)) {
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/* FIXME - copypasted from stub_tx, refactor */
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int i;
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for (i = 0; i < urb->number_of_packets; i++) {
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iov[iovnum].iov_base = urb->transfer_buffer +
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urb->iso_frame_desc[i].offset;
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iov[iovnum].iov_len =
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urb->iso_frame_desc[i].actual_length;
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iovnum++;
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txsize += urb->iso_frame_desc[i].actual_length;
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}
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if (txsize != sizeof(pdu_header) + urb->actual_length) {
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usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
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ret = -EPIPE;
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goto out;
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}
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}
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/* else - no buffer to send */
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/* 3. setup iso_packet_descriptor */
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if (urb_p->type == USB_ENDPOINT_XFER_ISOC) {
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ssize_t len = 0;
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iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
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if (!iso_buffer) {
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usbip_event_add(&udc->ud,
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VUDC_EVENT_ERROR_MALLOC);
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ret = -ENOMEM;
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goto out;
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}
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iov[iovnum].iov_base = iso_buffer;
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iov[iovnum].iov_len = len;
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txsize += len;
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iovnum++;
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}
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ret = kernel_sendmsg(udc->ud.tcp_socket, &msg,
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iov, iovnum, txsize);
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if (ret != txsize) {
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usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
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if (ret >= 0)
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ret = -EPIPE;
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goto out;
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}
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out:
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kfree(iov);
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kfree(iso_buffer);
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free_urbp_and_urb(urb_p);
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if (ret < 0)
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return ret;
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return txsize;
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}
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static int v_send_ret(struct vudc *udc)
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{
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unsigned long flags;
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struct tx_item *txi;
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size_t total_size = 0;
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int ret = 0;
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spin_lock_irqsave(&udc->lock_tx, flags);
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while (!list_empty(&udc->tx_queue)) {
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txi = list_first_entry(&udc->tx_queue, struct tx_item,
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tx_entry);
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list_del(&txi->tx_entry);
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spin_unlock_irqrestore(&udc->lock_tx, flags);
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switch (txi->type) {
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case TX_SUBMIT:
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ret = v_send_ret_submit(udc, txi->s);
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break;
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case TX_UNLINK:
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ret = v_send_ret_unlink(udc, txi->u);
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break;
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}
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kfree(txi);
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if (ret < 0)
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return ret;
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total_size += ret;
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spin_lock_irqsave(&udc->lock_tx, flags);
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}
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spin_unlock_irqrestore(&udc->lock_tx, flags);
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return total_size;
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}
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int v_tx_loop(void *data)
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{
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struct usbip_device *ud = (struct usbip_device *) data;
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struct vudc *udc = container_of(ud, struct vudc, ud);
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int ret;
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while (!kthread_should_stop()) {
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if (usbip_event_happened(&udc->ud))
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break;
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ret = v_send_ret(udc);
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if (ret < 0) {
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pr_warn("v_tx exit with error %d", ret);
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break;
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}
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wait_event_interruptible(udc->tx_waitq,
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(!list_empty(&udc->tx_queue) ||
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kthread_should_stop()));
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}
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return 0;
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}
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/* called with spinlocks held */
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void v_enqueue_ret_unlink(struct vudc *udc, __u32 seqnum, __u32 status)
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{
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struct tx_item *txi;
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struct v_unlink *unlink;
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txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
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if (!txi) {
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usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
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return;
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}
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unlink = kzalloc(sizeof(*unlink), GFP_ATOMIC);
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if (!unlink) {
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kfree(txi);
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usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
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return;
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}
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unlink->seqnum = seqnum;
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unlink->status = status;
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txi->type = TX_UNLINK;
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txi->u = unlink;
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list_add_tail(&txi->tx_entry, &udc->tx_queue);
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}
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/* called with spinlocks held */
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void v_enqueue_ret_submit(struct vudc *udc, struct urbp *urb_p)
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{
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struct tx_item *txi;
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txi = kzalloc(sizeof(*txi), GFP_ATOMIC);
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if (!txi) {
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usbip_event_add(&udc->ud, VDEV_EVENT_ERROR_MALLOC);
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return;
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}
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txi->type = TX_SUBMIT;
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txi->s = urb_p;
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list_add_tail(&txi->tx_entry, &udc->tx_queue);
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}
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