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

Minwoo Im
2019-05-12T07:34:52Z

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@intel.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: James Smart <james.smart@broadcom.com>
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
---
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