accel: add method for getting per-channel opcode stats

Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Change-Id: Ic3cc0ddc5907e113b6d9d752c9bff0f526458a11
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/17625
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>

include/spdk/accel.h

@@ -691,6 +691,26 @@ int spdk_accel_set_opts(const struct spdk_accel_opts *opts);
  */
 void spdk_accel_get_opts(struct spdk_accel_opts *opts);
 
+struct spdk_accel_opcode_stats {
+	/** Number of executed operations */
+	uint64_t	executed;
+	/** Number of failed operations */
+	uint64_t	failed;
+	/** Number of processed bytes */
+	uint64_t	num_bytes;
+} __attribute__((packed));
+
+/**
+ * Retrieve opcode statistics for a given IO channel.
+ *
+ * \param ch I/O channel.
+ * \param opcode Operation to retrieve statistics.
+ * \param stats Per-channel statistics.
+ * \param size Size of the `stats` structure.
+ */
+void spdk_accel_get_opcode_stats(struct spdk_io_channel *ch, enum accel_opcode opcode,
+				 struct spdk_accel_opcode_stats *stats, size_t size);
+
 #ifdef __cplusplus
 }
 #endif

lib/accel/accel.c

@@ -2715,4 +2715,26 @@ accel_get_stats(accel_get_stats_cb cb_fn, void *cb_arg)
 	return 0;
 }
 
+void
+spdk_accel_get_opcode_stats(struct spdk_io_channel *ch, enum accel_opcode opcode,
+			    struct spdk_accel_opcode_stats *stats, size_t size)
+{
+	struct accel_io_channel *accel_ch = spdk_io_channel_get_ctx(ch);
+
+#define FIELD_OK(field) \
+	offsetof(struct spdk_accel_opcode_stats, field) + sizeof(stats->field) <= size
+
+#define SET_FIELD(field, value) \
+	if (FIELD_OK(field)) { \
+		stats->field = value; \
+	}
+
+	SET_FIELD(executed, accel_ch->stats.operations[opcode].executed);
+	SET_FIELD(failed, accel_ch->stats.operations[opcode].failed);
+	SET_FIELD(num_bytes, accel_ch->stats.operations[opcode].num_bytes);
+
+#undef FIELD_OK
+#undef SET_FIELD
+}
+
 SPDK_LOG_REGISTER_COMPONENT(accel)

lib/accel/spdk_accel.map

@@ -39,6 +39,7 @@
 	spdk_accel_get_memory_domain;
 	spdk_accel_set_opts;
 	spdk_accel_get_opts;
+	spdk_accel_get_opcode_stats;
 
 	# functions needed by modules
 	spdk_accel_module_list_add;