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284 lines
6.3 KiB
284 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2015 Karol Kosik <[email protected]> |
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* Copyright (C) 2015-2016 Samsung Electronics |
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* Igor Kotrasinski <[email protected]> |
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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->actual_length > 0 && !urb->transfer_buffer) { |
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dev_err(&udc->gadget.dev, |
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"urb: actual_length %d transfer_buffer null\n", |
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urb->actual_length); |
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return -1; |
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} |
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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\n", |
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pdu_header.base.seqnum); |
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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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