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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/usbip/vhci_rx.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/usbip/vhci_rx.c')
-rw-r--r--drivers/usb/usbip/vhci_rx.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/usb/usbip/vhci_rx.c b/drivers/usb/usbip/vhci_rx.c
new file mode 100644
index 000000000..7f2d1c241
--- /dev/null
+++ b/drivers/usb/usbip/vhci_rx.c
@@ -0,0 +1,270 @@
+// 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:
+ fallthrough;
+ 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;
+}
+
+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) {
+ urb->status = -EPROTO;
+ goto error;
+ }
+
+ /* recv iso_packet_descriptor */
+ if (usbip_recv_iso(ud, urb) < 0) {
+ urb->status = -EPROTO;
+ goto error;
+ }
+
+ /* restore the padding in iso packets */
+ usbip_pad_iso(ud, urb);
+
+error:
+ if (usbip_dbg_flag_vhci_rx)
+ usbip_dump_urb(urb);
+
+ if (urb->num_sgs)
+ urb->transfer_flags &= ~URB_DMA_MAP_SG;
+
+ 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");
+}
+
+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;
+}
+
+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);
+}
+
+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;
+}
+
+/* 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;
+ }
+}
+
+int vhci_rx_loop(void *data)
+{
+ struct usbip_device *ud = data;
+
+ while (!kthread_should_stop()) {
+ if (usbip_event_happened(ud))
+ break;
+
+ usbip_kcov_remote_start(ud);
+ vhci_rx_pdu(ud);
+ usbip_kcov_remote_stop();
+ }
+
+ return 0;
+}