Major update and bugfix for the 'mly' driver.

 - Convert to a more efficient queueing implementation.
 - Don't allocate command buffers on the fly; simply work from a
   static pool.
 - Add a control device interface, for later use.
 - Handle controller overload better as a consequence of the
   improved queue implementation.
 - Add support for the XPT_GET_TRAN_SETTINGS ccb, and correctly
   set the virtual SCSI channels up for multiple outstanding I/Os.
 - Update copyrights for 2001.
 - Some whitespace fixes to improve readability.

Due to a misunderstanding on my part, previous versions of the
driver were limited to a single outstanding I/O per virtual drive.
Needless to say, this update improves performance substantially.

1 files changed, 72 insertions, 0 deletions

diff --git a/sys/dev/mly/mlyio.h b/sys/dev/mly/mlyio.h
new file mode 100644
index 0000000..949b071
--- /dev/null
+++ b/sys/dev/mly/mlyio.h
@@ -0,0 +1,72 @@
+/*-
+ * Copyright (c) 2001 Michael Smith
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$FreeBSD$
+ */
+
+/********************************************************************************
+ * Control structures exchanged through the GAM interface with userland
+ * management tools.
+ *
+ * The member naming here is consistent with the Linux driver, with which this
+ * interface is basically compatible. 
+ */
+struct mly_user_command
+{
+    unsigned char		ControllerNumber;
+    union mly_command_packet	CommandMailbox;
+    int				DataTransferLength;
+    int				RequestSenseLength;
+    void			*DataTransferBuffer;
+    void			*RequestSenseBuffer;
+    int				CommandStatus;		/* not in the Linux structure */
+};
+
+#define MLYIO_COMMAND	_IOWR('M', 200, struct mly_user_command)
+
+struct mly_user_health
+{
+    unsigned char	ControllerNumber;
+    void		*HealthStatusBuffer;
+};
+
+#define MLYIO_HEALTH	_IOW('M', 201, struct mly_user_health)
+
+/*
+ * Command queue statistics
+ */
+
+#define MLYQ_FREE	0
+#define MLYQ_CCB	1
+#define MLYQ_READY	2
+#define MLYQ_BUSY	3
+#define MLYQ_COMPLETE	4
+#define MLYQ_COUNT	5
+
+struct mly_qstat 
+{
+    u_int32_t	q_length;
+    u_int32_t	q_max;
+};