[14/74] staging: usbip: bugfix for isochronous packets and optimization

[Greg KH <gregkh@suse.de>]

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Arjan Mels <arjan.mels@gmx.net>

commit 28276a28d8b3cd19f4449991faad4945fe557656 upstream.

For isochronous packets the actual_length is the sum of the actual
length of each of the packets, however between the packets might be
padding, so it is not sufficient to just send the first actual_length
bytes of the buffer. To fix this and simultanesouly optimize the
bandwidth the content of the isochronous packets are send without the
padding, the padding is restored on the receiving end.

Signed-off-by: Arjan Mels <arjan.mels@gmx.net>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Cc: Max Vozeler <max@vozeler.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/staging/usbip/stub_tx.c      |   74 ++++++++++++++++++++++++++++-------
 drivers/staging/usbip/usbip_common.c |   57 ++++++++++++++++++++++++++
 drivers/staging/usbip/usbip_common.h |    2 
 drivers/staging/usbip/vhci_rx.c      |    3 +
 4 files changed, 122 insertions(+), 14 deletions(-)

--- a/drivers/staging/usbip/stub_tx.c
+++ b/drivers/staging/usbip/stub_tx.c
@@ -167,7 +167,6 @@ static int stub_send_ret_submit(struct s
 	struct stub_priv *priv, *tmp;
 
 	struct msghdr msg;
-	struct kvec iov[3];
 	size_t txsize;
 
 	size_t total_size = 0;
@@ -177,28 +176,73 @@ static int stub_send_ret_submit(struct s
 		struct urb *urb = priv->urb;
 		struct usbip_header pdu_header;
 		void *iso_buffer = NULL;
+		struct kvec *iov = NULL;
+		int iovnum = 0;
 
 		txsize = 0;
 		memset(&pdu_header, 0, sizeof(pdu_header));
 		memset(&msg, 0, sizeof(msg));
-		memset(&iov, 0, sizeof(iov));
 
-		usbip_dbg_stub_tx("setup txdata urb %p\n", urb);
+		if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
+			iovnum = 2 + urb->number_of_packets;
+		else
+			iovnum = 2;
 
+		iov = kzalloc(iovnum * sizeof(struct kvec), GFP_KERNEL);
+
+		if (!iov) {
+			usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC);
+			return -1;
+		}
+
+		iovnum = 0;
 
 		/* 1. setup usbip_header */
 		setup_ret_submit_pdu(&pdu_header, urb);
+		usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n",
+						pdu_header.base.seqnum, urb);
+		/*usbip_dump_header(pdu_header);*/
 		usbip_header_correct_endian(&pdu_header, 1);
 
-		iov[0].iov_base = &pdu_header;
-		iov[0].iov_len  = sizeof(pdu_header);
+		iov[iovnum].iov_base = &pdu_header;
+		iov[iovnum].iov_len  = sizeof(pdu_header);
+		iovnum++;
 		txsize += sizeof(pdu_header);
 
 		/* 2. setup transfer buffer */
-		if (usb_pipein(urb->pipe) && urb->actual_length > 0) {
-			iov[1].iov_base = urb->transfer_buffer;
-			iov[1].iov_len  = urb->actual_length;
+		if (usb_pipein(urb->pipe) &&
+				usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS &&
+					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 (usb_pipein(urb->pipe) &&
+				usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+			/*
+			 * For isochronous packets: actual length is the sum of
+			 * the actual length of the individual, packets, but as
+			 * the packet offsets are not changed there will be
+			 * padding between the packets. To optimally use the
+			 * bandwidth the padding is not transmitted.
+			 */
+
+			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) {
+				dev_err(&sdev->interface->dev,
+					"actual length of urb (%d) does not match iso packet sizes (%d)\n",
+					urb->actual_length, txsize-sizeof(pdu_header));
+				kfree(iov);
+				usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
+			   return -1;
+			}
 		}
 
 		/* 3. setup iso_packet_descriptor */
@@ -209,32 +253,34 @@ static int stub_send_ret_submit(struct s
 			if (!iso_buffer) {
 				usbip_event_add(&sdev->ud,
 						SDEV_EVENT_ERROR_MALLOC);
+				kfree(iov);
 				return -1;
 			}
 
-			iov[2].iov_base = iso_buffer;
-			iov[2].iov_len  = len;
+			iov[iovnum].iov_base = iso_buffer;
+			iov[iovnum].iov_len  = len;
 			txsize += len;
+			iovnum++;
 		}
 
-		ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
-				     3, txsize);
+		ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg,
+						iov,  iovnum, txsize);
 		if (ret != txsize) {
 			dev_err(&sdev->interface->dev,
 				"sendmsg failed!, retval %d for %zd\n",
 				ret, txsize);
+			kfree(iov);
 			kfree(iso_buffer);
 			usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP);
 			return -1;
 		}
 
+		kfree(iov);
 		kfree(iso_buffer);
-		usbip_dbg_stub_tx("send txdata\n");
 
 		total_size += txsize;
 	}
 
-
 	spin_lock_irqsave(&sdev->priv_lock, flags);
 
 	list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) {
--- a/drivers/staging/usbip/usbip_common.c
+++ b/drivers/staging/usbip/usbip_common.c
@@ -896,6 +896,7 @@ int usbip_recv_iso(struct usbip_device *
 	int size = np * sizeof(*iso);
 	int i;
 	int ret;
+	int total_length = 0;
 
 	if (!usb_pipeisoc(urb->pipe))
 		return 0;
@@ -925,19 +926,75 @@ int usbip_recv_iso(struct usbip_device *
 		return -EPIPE;
 	}
 
+
 	for (i = 0; i < np; i++) {
 		iso = buff + (i * sizeof(*iso));
 
 		usbip_iso_pakcet_correct_endian(iso, 0);
 		usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
+		total_length += urb->iso_frame_desc[i].actual_length;
 	}
 
 	kfree(buff);
 
+	if (total_length != urb->actual_length) {
+		dev_err(&urb->dev->dev,
+		  "total length of iso packets (%d) not equal to actual length of buffer (%d)\n",
+		  total_length, urb->actual_length);
+
+		if (ud->side == USBIP_STUB)
+			usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
+		else
+			usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
+
+		return -EPIPE;
+	}
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 
+/*
+ * This functions restores the padding which was removed for optimizing
+ * the bandwidth during transfer over tcp/ip
+ *
+ * buffer and iso packets need to be stored and be in propeper endian in urb
+ * before calling this function
+ */
+int usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
+{
+	int np = urb->number_of_packets;
+	int i;
+	int ret;
+	int actualoffset = urb->actual_length;
+
+	if (!usb_pipeisoc(urb->pipe))
+		return 0;
+
+	/* if no packets or length of data is 0, then nothing to unpack */
+	if (np == 0 || urb->actual_length == 0)
+		return 0;
+
+	/*
+	 * if actual_length is transfer_buffer_length then no padding is
+	 * present.
+	*/
+	if (urb->actual_length == urb->transfer_buffer_length)
+		return 0;
+
+	/*
+	 * loop over all packets from last to first (to prevent overwritting
+	 * memory when padding) and move them into the proper place
+	 */
+	for (i = np-1; i > 0; i--) {
+		actualoffset -= urb->iso_frame_desc[i].actual_length;
+		memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
+				  urb->transfer_buffer + actualoffset,
+				  urb->iso_frame_desc[i].actual_length);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(usbip_pad_iso);
 
 /* some members of urb must be substituted before. */
 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
--- a/drivers/staging/usbip/usbip_common.h
+++ b/drivers/staging/usbip/usbip_common.h
@@ -393,6 +393,8 @@ void usbip_header_correct_endian(struct
 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
 /* some members of urb must be substituted before. */
 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
+/* some members of urb must be substituted before. */
+int usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
 
 
--- a/drivers/staging/usbip/vhci_rx.c
+++ b/drivers/staging/usbip/vhci_rx.c
@@ -97,6 +97,9 @@ static void vhci_recv_ret_submit(struct
 	if (usbip_recv_iso(ud, urb) < 0)
 		return;
 
+	/* restore the padding in iso packets */
+	if (usbip_pad_iso(ud, urb) < 0)
+		return;
 
 	if (usbip_dbg_flag_vhci_rx)
 		usbip_dump_urb(urb);