// 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> */ #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_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 urb: %p\n", pdu_header.base.seqnum, urb); 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); }