-----------

MISC CHANGES

Add a new async event- ISP_TARGET_NOTIFY_ACK, that will guarantee
eventual delivery of a NOTIFY ACK. This is tons better than just
ignoring the return from isp_notify_ack and hoping for the best.

Clean up the lower level lun enable code to be a bit more sensible.

Fix a botch in isp_endcmd which was messing up the sense data.

Fix notify ack for SRR to use a sensible error code in the case
of a reject.

Clean up and make clear what kind of firmware we've loaded and
what capabilities it has.
-----------
FULL (252 byte) SENSE DATA

In CTIOs for the ISP, there's only a limimted amount of space
to load SENSE DATA for associated CHECK CONDITIONS (24 or 26
bytes). This makes it difficult to send full SENSE DATA that can
be up to 252 bytes.

Implement MODE 2 responses which have us build the FCP Response
in system memory which the ISP will put onto the wire directly.

On the initiator side, the same problem occurs in that a command
status response only has a limited amount of space for SENSE DATA.
This data is supplemented by status continuation responses that
the ISP pushes onto the response queue after the status response.
We now pull them all together so that full sense data can be
returned to the periph driver.

This is supported on 23XX, 24XX and 25XX cards.

This is also preparation for doing >16 byte CDBs.

-----------
FC TAPE

Implement full FC-TAPE on both initiator and target mode side.  This
capability is driven by firmware loaded, board type, board NVRAM
settings, or hint configuration options to enable or disable. This
is supported for 23XX, 24XX and 25XX cards.

On the initiator side, we pretty much just have to generate a command
reference number for each command we send out. This is FCP-4 compliant
in that we do this per ITL nexus to generate the allowed 1 thru 255
CRN.

In order to support the target side of FC-TAPE, we now pay attention
to more of the PRLI word 3 parameters which will tell us whether
an initiator wants confirmed responses. While we're at it, we'll
pay attention to the initiator view too and report it.

On sending back CTIOs, we will notice whether the initiator wants
confirmed responses and we'll set up flags to do so.

If a response or data frame is lost the initiator sends us an SRR
(Sequence Retransmit Request) ELS which shows up as an SRR notify
and all outstanding CTIOs are nuked with SRR Received status. The
SRR notify contains the offset that the initiator wants us to restart
the data transfer from or to retransmit the response frame.

If the ISP driver still has the CCB around for which the data segment
or response applies, it will retransmit.

However, we typically don't know about a lost data frame until we
send the FCP Response and the initiator totes up counters for data
moved and notices missing segments. In this case we've already
completed the data CCBs already and sent themn back up to the periph
driver.  Because there's no really clean mechanism yet in CAM to
handle this, a hack has been put into place to complete the CTIO
CCB with the CAM_MESSAGE_RECV status which will have a MODIFY DATA
POINTER extended message in it. The internal ISP target groks this
and ctl(8) will be modified to deal with this as well.

At any rate, the data is retransmitted and an an FCP response is
sent. The whole point here is to successfully complete a command
so that you don't have to depend on ULP (SCSI) to have to recover,
which in the case of tape is not really possible (hence the name
FC-TAPE).

Sponsored by: Spectralogic
MFC after:	1 month

1 files changed, 70 insertions, 8 deletions

diff --git a/sys/dev/isp/isp_stds.h b/sys/dev/isp/isp_stds.h
index 2ed66cb5f37d..e53f0058323d 100644
--- a/sys/dev/isp/isp_stds.h
+++ b/sys/dev/isp/isp_stds.h
@@ -137,9 +137,30 @@ typedef struct {
 } rft_id_t;
 
 /*
- * FCP Response IU Bits of interest
- * Source: NCITS T10, Project 1144D, Revision 08 (aka FCP2r08)
+ * FCP Response IU and bits of interest
+ * Source: NCITS T10, Project 1828D, Revision 02b (aka FCP4r02b)
  */
+typedef struct {
+	uint8_t		fcp_rsp_reserved[8];
+	uint16_t	fcp_rsp_status_qualifier;	/* SAM-5 Status Qualifier */
+	uint8_t		fcp_rsp_bits;
+	uint8_t		fcp_rsp_scsi_status;		/* SAM-5 SCSI Status Byte */
+	uint32_t	fcp_rsp_resid;
+	uint32_t	fcp_rsp_snslen;
+	uint32_t	fcp_rsp_rsplen;
+	/*
+	 * In the bytes that follow, it's going to be
+	 * FCP RESPONSE INFO (max 8 bytes, possibly 0)
+	 * FCP SENSE INFO (if any)
+	 * FCP BIDIRECTIONAL READ RESID (if any)
+	 */
+	uint8_t		fcp_rsp_extra[0];
+} fcp_rsp_iu_t;
+#define	MIN_FCP_RESPONSE_SIZE		24
+
+#define	FCP_BIDIR_RSP			0x80	/* Bi-Directional response */
+#define	FCP_BIDIR_RESID_UNDERFLOW	0x40
+#define	FCP_BIDIR_RESID_OVERFLOW	0x20
 #define	FCP_CONF_REQ			0x10
 #define	FCP_RESID_UNDERFLOW		0x08
 #define	FCP_RESID_OVERFLOW		0x04
@@ -162,17 +183,41 @@ typedef struct {
 #define	FCP_RSPNS_TMF_SUCCEEDED		8
 #define	FCP_RSPNS_TMF_INCORRECT_LUN	9
 
+/*
+ * R_CTL field definitions
+ *
+ * Bits 31-28 are ROUTING
+ * Bits 27-24 are INFORMATION
+ *
+ * These are nibble values, not bits
+ */
+#define	R_CTL_ROUTE_DATA	0x00
+#define	R_CTL_ROUTE_ELS		0x02
+#define	R_CTL_ROUTE_FC4_LINK	0x03
+#define	R_CTL_ROUTE_VDATA	0x04
+#define	R_CTL_ROUTE_EXENDED	0x05
+#define	R_CTL_ROUTE_BASIC	0x08
+#define	R_CTL_ROUTE_LINK	0x0c
+#define	R_CTL_ROUTE_EXT_ROUTING	0x0f
+
+#define	R_CTL_INFO_UNCATEGORIZED	0x00
+#define	R_CTL_INFO_SOLICITED_DATA	0x01
+#define	R_CTL_INFO_UNSOLICITED_CONTROL	0x02
+#define	R_CTL_INFO_SOLICITED_CONTROL	0x03
+#define	R_CTL_INFO_UNSOLICITED_DATA	0x04
+#define	R_CTL_INFO_DATA_DESCRIPTOR	0x05
+#define	R_CTL_INFO_UNSOLICITED_COMMAND	0x06
+#define	R_CTL_INFO_COMMAND_STATUS	0x07
+
+#define	MAKE_RCTL(a, b)	(((a) << 4) | (b))
 
 /* unconverted miscellany */
 /*
  * Basic FC Link Service defines
  */
-/*
- * These are in the R_CTL field.
- */
-#define	ABTS			0x81
-#define	BA_ACC			0x84	/* of ABORT SEQUENCE */
-#define	BA_RJT			0x85	/* of ABORT SEQUENCE */
+/* #define	ABTS	MAKE_RCTL(R_CTL_ROUTE_BASIC, R_CTL_INFO_SOLICITED_DATA) */
+#define	BA_ACC	MAKE_RCTL(R_CTL_ROUTE_BASIC, R_CTL_INFO_UNSOLICITED_DATA)	/* of ABORT */
+#define	BA_RJT	MAKE_RCTL(R_CTL_ROUTE_BASIC, R_CTL_INFO_DATA_DESCRIPTOR)	/* of ABORT */
 
 /*
  * Link Service Accept/Reject
@@ -196,6 +241,23 @@ typedef struct {
 #define	RNC			0x53
 
 /*
+ * PRLI Word 3 definitions
+ * FPC4-r02b January, 2011
+ */
+#define	PRLI_WD3_ENHANCED_DISCOVERY			(1 << 11)
+#define	PRLI_WD3_REC_SUPPORT				(1 << 10)
+#define	PRLI_WD3_TASK_RETRY_IDENTIFICATION_REQUESTED	(1 << 9)
+#define	PRLI_WD3_RETRY					(1 << 8)
+#define	PRLI_WD3_CONFIRMED_COMPLETION_ALLOWED		(1 << 7)
+#define	PRLI_WD3_DATA_OVERLAY_ALLOWED			(1 << 6)
+#define	PRLI_WD3_INITIATOR_FUNCTION			(1 << 5)
+#define	PRLI_WD3_TARGET_FUNCTION			(1 << 4)
+#define	PRLI_WD3_READ_FCP_XFER_RDY_DISABLED		(1 << 1)	/* definitely supposed to be set */
+#define	PRLI_WD3_WRITE_FCP_XFER_RDY_DISABLED		(1 << 0)
+
+
+
+/*
  * FC4 defines
  */
 #define	FC4_IP		5	/* ISO/EEC 8802-2 LLC/SNAP */