[PATCH V3 2/5] nvme-trace: Support tracing fabrics commands from host-side

[Minwoo Im]

This patch adds support for tracing fabrics commands detected from
host-side.  We can have trace_nvme_setup_cmd for nvme and nvme fabrics
both even fabrics submission queue entry does not have valid fields in
where nvme's fields are valid.

This patch modifies existing parse_nvme_cmd to have fctype as an
argument to support fabrics command which will be ignored in case of
nvme common case.

Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: James Smart <james.smart@xxxxxxxxxxxx>
Signed-off-by: Minwoo Im <minwoo.im.dev@xxxxxxxxx>
---
 drivers/nvme/trace.c | 67 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/nvme/trace.h | 41 +++++++++++++++++++++------
 2 files changed, 100 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/trace.c b/drivers/nvme/trace.c
index a2c8186d122d..88dfadb68b92 100644
--- a/drivers/nvme/trace.c
+++ b/drivers/nvme/trace.c
@@ -137,6 +137,73 @@ const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p,
 	}
 }
 
+static const char *nvme_trace_fabrics_property_set(struct trace_seq *p, u8 *spc)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 attrib = spc[0];
+	u32 ofst = get_unaligned_le32(spc + 4);
+	u64 value = get_unaligned_le64(spc + 8);
+
+	trace_seq_printf(p, "attrib=%u, ofst=0x%x, value=0x%llx",
+				attrib, ofst, value);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char *nvme_trace_fabrics_connect(struct trace_seq *p, u8 *spc)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u16 recfmt = get_unaligned_le16(spc);
+	u16 qid = get_unaligned_le16(spc + 2);
+	u16 sqsize = get_unaligned_le16(spc + 4);
+	u8 cattr = spc[6];
+	u32 kato = get_unaligned_le32(spc + 8);
+
+	trace_seq_printf(p, "recfmt=%u, qid=%u, sqsize=%u, cattr=%u, kato=%u",
+				recfmt, qid, sqsize, cattr, kato);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char *nvme_trace_fabrics_property_get(struct trace_seq *p, u8 *spc)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 attrib = spc[0];
+	u32 ofst = get_unaligned_le32(spc + 4);
+
+	trace_seq_printf(p, "attrib=%u, ofst=0x%x", attrib, ofst);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char *nvme_trace_fabrics_common(struct trace_seq *p, u8 *spc)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+
+	trace_seq_printf(p, "spcecific=%*ph", 24, spc);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+const char *nvme_trace_parse_fabrics_cmd(struct trace_seq *p,
+					 u8 fctype, u8 *spc)
+{
+	switch (fctype) {
+	case nvme_fabrics_type_property_set:
+		return nvme_trace_fabrics_property_set(p, spc);
+	case nvme_fabrics_type_connect:
+		return nvme_trace_fabrics_connect(p, spc);
+	case nvme_fabrics_type_property_get:
+		return nvme_trace_fabrics_property_get(p, spc);
+	default:
+		return nvme_trace_fabrics_common(p, spc);
+	}
+}
+
 const char *nvme_trace_disk_name(struct trace_seq *p, char *name)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
diff --git a/drivers/nvme/trace.h b/drivers/nvme/trace.h
index acf10c7a5bef..7fbfd6cb815c 100644
--- a/drivers/nvme/trace.h
+++ b/drivers/nvme/trace.h
@@ -57,18 +57,39 @@
 		nvme_opcode_name(nvme_cmd_resv_acquire),	\
 		nvme_opcode_name(nvme_cmd_resv_release))
 
-#define show_opcode_name(qid, opcode)					\
-	(qid ? show_nvm_opcode_name(opcode) : show_admin_opcode_name(opcode))
+#define nvme_fabrics_type_name(type)	{ type, #type }
+#define show_fabrics_type_name(type)					\
+	__print_symbolic(type,						\
+		nvme_fabrics_type_name(nvme_fabrics_type_property_set),	\
+		nvme_fabrics_type_name(nvme_fabrics_type_connect),	\
+		nvme_fabrics_type_name(nvme_fabrics_type_property_get))
+
+/*
+ * If not fabrics, fctype will be ignored.
+ */
+#define show_opcode_name(qid, opcode, fctype)				\
+	((opcode != nvme_fabrics_command) ?				\
+		(qid ?							\
+			show_nvm_opcode_name(opcode) :			\
+			show_admin_opcode_name(opcode)) :		\
+		show_fabrics_type_name(fctype))
 
 const char *nvme_trace_parse_admin_cmd(struct trace_seq *p, u8 opcode,
 		u8 *cdw10);
 const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p, u8 opcode,
 		u8 *cdw10);
+const char *nvme_trace_parse_fabrics_cmd(struct trace_seq *p,
+		u8 fctype, u8 *spc);
 
-#define parse_nvme_cmd(qid, opcode, cdw10) 			\
-	(qid ?							\
-	 nvme_trace_parse_nvm_cmd(p, opcode, cdw10) : 		\
-	 nvme_trace_parse_admin_cmd(p, opcode, cdw10))
+/*
+ * If not fabrics, fctype will be ignored.
+ */
+#define parse_nvme_cmd(qid, opcode, fctype, cdw10)			\
+	((opcode != nvme_fabrics_command) ?				\
+		(qid ?							\
+			nvme_trace_parse_nvm_cmd(p, opcode, cdw10) : 	\
+			nvme_trace_parse_admin_cmd(p, opcode, cdw10)) :	\
+		nvme_trace_parse_fabrics_cmd(p, fctype, cdw10))
 
 const char *nvme_trace_disk_name(struct trace_seq *p, char *name);
 #define __print_disk_name(name)				\
@@ -95,6 +116,7 @@ TRACE_EVENT(nvme_setup_cmd,
 		__field(u8, flags)
 		__field(u16, cid)
 		__field(u32, nsid)
+		__field(u8, fctype)
 		__field(u64, metadata)
 		__array(u8, cdw10, 24)
 	    ),
@@ -105,6 +127,7 @@ TRACE_EVENT(nvme_setup_cmd,
 		__entry->flags = cmd->common.flags;
 		__entry->cid = cmd->common.command_id;
 		__entry->nsid = le32_to_cpu(cmd->common.nsid);
+		__entry->fctype = __entry->nsid & 0xff;
 		__entry->metadata = le64_to_cpu(cmd->common.metadata);
 		__assign_disk_name(__entry->disk, req->rq_disk);
 		memcpy(__entry->cdw10, &cmd->common.cdw10,
@@ -114,8 +137,10 @@ TRACE_EVENT(nvme_setup_cmd,
 		      __entry->ctrl_id, __print_disk_name(__entry->disk),
 		      __entry->qid, __entry->cid, __entry->nsid,
 		      __entry->flags, __entry->metadata,
-		      show_opcode_name(__entry->qid, __entry->opcode),
-		      parse_nvme_cmd(__entry->qid, __entry->opcode, __entry->cdw10))
+		      show_opcode_name(__entry->qid, __entry->opcode,
+					__entry->fctype),
+		      parse_nvme_cmd(__entry->qid, __entry->opcode,
+					__entry->fctype, __entry->cdw10))
 );
 
 TRACE_EVENT(nvme_complete_rq,
-- 
2.17.1