Release 4.16 drivers/usb/usbip/vhci_rx.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 */

#include <linux/kthread.h>
#include <linux/slab.h>

#include "usbip_common.h"
#include "vhci.h"

/* get URB from transmitted urb queue. caller must hold vdev->priv_lock */


struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum)
{
	struct vhci_priv *priv, *tmp;
	struct urb *urb = NULL;
	int status;

	list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
		if (priv->seqnum != seqnum)
			continue;

		urb = priv->urb;
		status = urb->status;

		usbip_dbg_vhci_rx("find urb seqnum %u\n", seqnum);

		switch (status) {
		case -ENOENT:
			/* fall through */
		case -ECONNRESET:
			dev_dbg(&urb->dev->dev,
				 "urb seq# %u was unlinked %ssynchronously\n",
				 seqnum, status == -ENOENT ? "" : "a");
			break;
		case -EINPROGRESS:
			/* no info output */
			break;
		default:
			dev_dbg(&urb->dev->dev,
				 "urb seq# %u may be in a error, status %d\n",
				 seqnum, status);
		}

		list_del(&priv->list);
		kfree(priv);
		urb->hcpriv = NULL;

		break;
	}

	return urb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
134
84.81%
1
20.00%
Stefan Reif
16
10.13%
1
20.00%
Shuah Khan
6
3.80%
1
20.00%
Brian G. Merrell
1
0.63%
1
20.00%
Colin Ian King
1
0.63%
1
20.00%
Total
158
100.00%
5
100.00%



static void vhci_recv_ret_submit(struct vhci_device *vdev,
				 struct usbip_header *pdu)
{
	struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
	struct vhci *vhci = vhci_hcd->vhci;
	struct usbip_device *ud = &vdev->ud;
	struct urb *urb;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);
	urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	if (!urb) {
		pr_err("cannot find a urb of seqnum %u max seqnum %d\n",
			pdu->base.seqnum,
			atomic_read(&vhci_hcd->seqnum));
		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
		return;
	}

	/* unpack the pdu to a urb */
	usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);

	/* recv transfer buffer */
	if (usbip_recv_xbuff(ud, urb) < 0)
		return;

	/* recv iso_packet_descriptor */
	if (usbip_recv_iso(ud, urb) < 0)
		return;

	/* restore the padding in iso packets */
	usbip_pad_iso(ud, urb);

	if (usbip_dbg_flag_vhci_rx)
		usbip_dump_urb(urb);

	usbip_dbg_vhci_rx("now giveback urb %u\n", pdu->base.seqnum);

	spin_lock_irqsave(&vhci->lock, flags);
	usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb);
	spin_unlock_irqrestore(&vhci->lock, flags);

	usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status);

	usbip_dbg_vhci_rx("Leave\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
161
68.22%
1
9.09%
Andrew Goodbody
16
6.78%
1
9.09%
Yuyang Du
16
6.78%
2
18.18%
Max Vozeler
14
5.93%
1
9.09%
Nobuo Iwata
10
4.24%
1
9.09%
Arjan Mels
7
2.97%
1
9.09%
Shuah Khan
7
2.97%
1
9.09%
Brian G. Merrell
3
1.27%
1
9.09%
Bart Westgeest
1
0.42%
1
9.09%
Matt Mooney
1
0.42%
1
9.09%
Total
236
100.00%
11
100.00%



static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
						  struct usbip_header *pdu)
{
	struct vhci_unlink *unlink, *tmp;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);

	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
		pr_info("unlink->seqnum %lu\n", unlink->seqnum);
		if (unlink->seqnum == pdu->base.seqnum) {
			usbip_dbg_vhci_rx("found pending unlink, %lu\n",
					  unlink->seqnum);
			list_del(&unlink->list);

			spin_unlock_irqrestore(&vdev->priv_lock, flags);
			return unlink;
		}
	}

	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
103
87.29%
1
25.00%
Andrew Goodbody
13
11.02%
1
25.00%
Matt Mooney
1
0.85%
1
25.00%
Brian G. Merrell
1
0.85%
1
25.00%
Total
118
100.00%
4
100.00%



static void vhci_recv_ret_unlink(struct vhci_device *vdev,
				 struct usbip_header *pdu)
{
	struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
	struct vhci *vhci = vhci_hcd->vhci;
	struct vhci_unlink *unlink;
	struct urb *urb;
	unsigned long flags;

	usbip_dump_header(pdu);

	unlink = dequeue_pending_unlink(vdev, pdu);
	if (!unlink) {
		pr_info("cannot find the pending unlink %u\n",
			pdu->base.seqnum);
		return;
	}

	spin_lock_irqsave(&vdev->priv_lock, flags);
	urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	if (!urb) {
		/*
                 * I get the result of a unlink request. But, it seems that I
                 * already received the result of its submit result and gave
                 * back the URB.
                 */
		pr_info("the urb (seqnum %d) was already given back\n",
			pdu->base.seqnum);
	} else {
		usbip_dbg_vhci_rx("now giveback urb %d\n", pdu->base.seqnum);

		/* If unlink is successful, status is -ECONNRESET */
		urb->status = pdu->u.ret_unlink.status;
		pr_info("urb->status %d\n", urb->status);

		spin_lock_irqsave(&vhci->lock, flags);
		usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb);
		spin_unlock_irqrestore(&vhci->lock, flags);

		usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status);
	}

	kfree(unlink);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
149
68.66%
1
9.09%
Andrew Goodbody
16
7.37%
1
9.09%
Yuyang Du
15
6.91%
2
18.18%
Max Vozeler
14
6.45%
1
9.09%
Nobuo Iwata
10
4.61%
1
9.09%
Shuah Khan
6
2.76%
1
9.09%
Matt Mooney
4
1.84%
1
9.09%
Brian G. Merrell
1
0.46%
1
9.09%
Christopher Harvey
1
0.46%
1
9.09%
Bart Westgeest
1
0.46%
1
9.09%
Total
217
100.00%
11
100.00%



static int vhci_priv_tx_empty(struct vhci_device *vdev)
{
	int empty = 0;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);
	empty = list_empty(&vdev->priv_rx);
	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	return empty;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Max Vozeler
43
81.13%
1
50.00%
Andrew Goodbody
10
18.87%
1
50.00%
Total
53
100.00%
2
100.00%

/* recv a pdu */


static void vhci_rx_pdu(struct usbip_device *ud)
{
	int ret;
	struct usbip_header pdu;
	struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);

	usbip_dbg_vhci_rx("Enter\n");

	memset(&pdu, 0, sizeof(pdu));

	/* receive a pdu header */
	ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
	if (ret < 0) {
		if (ret == -ECONNRESET)
			pr_info("connection reset by peer\n");
		else if (ret == -EAGAIN) {
			/* ignore if connection was idle */
			if (vhci_priv_tx_empty(vdev))
				return;
			pr_info("connection timed out with pending urbs\n");
		} else if (ret != -ERESTARTSYS)
			pr_info("xmit failed %d\n", ret);

		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
		return;
	}
	if (ret == 0) {
		pr_info("connection closed");
		usbip_event_add(ud, VDEV_EVENT_DOWN);
		return;
	}
	if (ret != sizeof(pdu)) {
		pr_err("received pdu size is %d, should be %d\n", ret,
		       (unsigned int)sizeof(pdu));
		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
		return;
	}

	usbip_header_correct_endian(&pdu, 0);

	if (usbip_dbg_flag_vhci_rx)
		usbip_dump_header(&pdu);

	switch (pdu.base.command) {
	case USBIP_RET_SUBMIT:
		vhci_recv_ret_submit(vdev, &pdu);
		break;
	case USBIP_RET_UNLINK:
		vhci_recv_ret_unlink(vdev, &pdu);
		break;
	default:
		/* NOT REACHED */
		pr_err("unknown pdu %u\n", pdu.base.command);
		usbip_dump_header(&pdu);
		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
170
62.73%
1
11.11%
Max Vozeler
85
31.37%
2
22.22%
Matt Mooney
8
2.95%
2
22.22%
Greg Kroah-Hartman
4
1.48%
1
11.11%
Brian G. Merrell
2
0.74%
1
11.11%
Bart Westgeest
1
0.37%
1
11.11%
Kurt Kanzenbach
1
0.37%
1
11.11%
Total
271
100.00%
9
100.00%



int vhci_rx_loop(void *data)
{
	struct usbip_device *ud = data;

	while (!kthread_should_stop()) {
		if (usbip_event_happened(ud))
			break;

		vhci_rx_pdu(ud);
	}

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
29
72.50%
1
33.33%
Arnd Bergmann
10
25.00%
1
33.33%
Brian G. Merrell
1
2.50%
1
33.33%
Total
40
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Takahiro Hirofuchi
753
67.90%
1
3.85%
Max Vozeler
157
14.16%
3
11.54%
Andrew Goodbody
55
4.96%
1
3.85%
Yuyang Du
31
2.80%
2
7.69%
Nobuo Iwata
20
1.80%
1
3.85%
Shuah Khan
19
1.71%
1
3.85%
Stefan Reif
16
1.44%
1
3.85%
Matt Mooney
16
1.44%
3
11.54%
Arnd Bergmann
12
1.08%
1
3.85%
Brian G. Merrell
9
0.81%
1
3.85%
Arjan Mels
7
0.63%
1
3.85%
Greg Kroah-Hartman
6
0.54%
3
11.54%
Bart Westgeest
3
0.27%
3
11.54%
Tejun Heo
2
0.18%
1
3.85%
Kurt Kanzenbach
1
0.09%
1
3.85%
Colin Ian King
1
0.09%
1
3.85%
Christopher Harvey
1
0.09%
1
3.85%
Total
1109
100.00%
26
100.00%
Directory: drivers/usb/usbip

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