[PATCH 02/10] bbdev: add per-queue statistics API

[David Marchand <david.marchand@redhat.com>]

Add rte_bbdev_queue_stats_get() to retrieve statistics for a specific
queue. This allows applications to get per-queue stats without
accessing internal data structures.

Update test-bbdev to use the new API.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 app/test-bbdev/test_bbdev_perf.c       | 38 +++++---------------------
 doc/guides/rel_notes/release_26_07.rst |  5 ++++
 lib/bbdev/rte_bbdev.c                  | 20 ++++++++++++++
 lib/bbdev/rte_bbdev.h                  | 20 ++++++++++++++
 4 files changed, 52 insertions(+), 31 deletions(-)

diff --git a/app/test-bbdev/test_bbdev_perf.c b/app/test-bbdev/test_bbdev_perf.c
index 9fb0a25948..b75d8387bd 100644
--- a/app/test-bbdev/test_bbdev_perf.c
+++ b/app/test-bbdev/test_bbdev_perf.c
@@ -5849,30 +5849,6 @@ validation_test(struct active_device *ad, struct test_op_params *op_params)
 	return validation_latency_test(ad, op_params, false);
 }
 
-static int
-get_bbdev_queue_stats(uint16_t dev_id, uint16_t queue_id,
-		struct rte_bbdev_stats *stats)
-{
-	struct rte_bbdev *dev = &rte_bbdev_devices[dev_id];
-	struct rte_bbdev_stats *q_stats;
-
-	if (queue_id >= dev->data->num_queues)
-		return -1;
-
-	q_stats = &dev->data->queues[queue_id].queue_stats;
-
-	stats->enqueued_count = q_stats->enqueued_count;
-	stats->dequeued_count = q_stats->dequeued_count;
-	stats->enqueue_err_count = q_stats->enqueue_err_count;
-	stats->dequeue_err_count = q_stats->dequeue_err_count;
-	stats->enqueue_warn_count = q_stats->enqueue_warn_count;
-	stats->dequeue_warn_count = q_stats->dequeue_warn_count;
-	stats->acc_offload_cycles = q_stats->acc_offload_cycles;
-	stats->enqueue_depth_avail = q_stats->enqueue_depth_avail;
-
-	return 0;
-}
-
 static int
 offload_latency_test_fft(struct rte_mempool *mempool, struct test_buffers *bufs,
 		struct rte_bbdev_fft_op *ref_op, uint16_t dev_id,
@@ -5906,7 +5882,7 @@ offload_latency_test_fft(struct rte_mempool *mempool, struct test_buffers *bufs,
 					&ops_enq[enq], burst_sz - enq);
 		} while (unlikely(burst_sz != enq));
 
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -5988,7 +5964,7 @@ offload_latency_test_mldts(struct rte_mempool *mempool, struct test_buffers *buf
 					&ops_enq[enq], burst_sz - enq);
 		} while (unlikely(burst_sz != enq));
 
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -6069,7 +6045,7 @@ offload_latency_test_dec(struct rte_mempool *mempool, struct test_buffers *bufs,
 					&ops_enq[enq], burst_sz - enq);
 		} while (unlikely(burst_sz != enq));
 
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -6163,7 +6139,7 @@ offload_latency_test_ldpc_dec(struct rte_mempool *mempool,
 		} while (unlikely(burst_sz != enq));
 
 		enq_sw_last_time = rte_rdtsc_precise() - enq_start_time;
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -6251,7 +6227,7 @@ offload_latency_test_enc(struct rte_mempool *mempool, struct test_buffers *bufs,
 
 		enq_sw_last_time = rte_rdtsc_precise() - enq_start_time;
 
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -6332,7 +6308,7 @@ offload_latency_test_ldpc_enc(struct rte_mempool *mempool,
 		} while (unlikely(burst_sz != enq));
 
 		enq_sw_last_time = rte_rdtsc_precise() - enq_start_time;
-		ret = get_bbdev_queue_stats(dev_id, queue_id, &stats);
+		ret = rte_bbdev_queue_stats_get(dev_id, queue_id, &stats);
 		TEST_ASSERT_SUCCESS(ret,
 				"Failed to get stats for queue (%u) of device (%u)",
 				queue_id, dev_id);
@@ -6482,7 +6458,7 @@ offload_cost_test(struct active_device *ad,
 			rte_get_tsc_hz());
 
 	struct rte_bbdev_stats stats = {0};
-	ret = get_bbdev_queue_stats(ad->dev_id, queue_id, &stats);
+	ret = rte_bbdev_queue_stats_get(ad->dev_id, queue_id, &stats);
 	TEST_ASSERT_SUCCESS(ret,
 			"Failed to get stats for queue (%u) of device (%u)",
 			queue_id, ad->dev_id);
diff --git a/doc/guides/rel_notes/release_26_07.rst b/doc/guides/rel_notes/release_26_07.rst
index 6badd6d91b..dbad975d8c 100644
--- a/doc/guides/rel_notes/release_26_07.rst
+++ b/doc/guides/rel_notes/release_26_07.rst
@@ -190,6 +190,11 @@ New Features
   * Added ``eof`` devarg to use link state to signal end of receive file input.
   * Added unit test suite.
 
+* **Added per-queue statistics API in bbdev.**
+
+  Added ``rte_bbdev_queue_stats_get()`` function to retrieve statistics
+  for a specific queue, complementing the existing device-level statistics API.
+
 * **Updated Marvell cnxk crypto driver.**
 
   * Added support for ML-KEM and ML-DSA on CN20K platform.
diff --git a/lib/bbdev/rte_bbdev.c b/lib/bbdev/rte_bbdev.c
index 90095578cb..3f032a8e32 100644
--- a/lib/bbdev/rte_bbdev.c
+++ b/lib/bbdev/rte_bbdev.c
@@ -819,6 +819,26 @@ rte_bbdev_stats_reset(uint16_t dev_id)
 	return 0;
 }
 
+RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_bbdev_queue_stats_get, 26.07)
+int rte_bbdev_queue_stats_get(uint16_t dev_id, uint16_t queue_id, struct rte_bbdev_stats *stats)
+{
+	struct rte_bbdev *dev = get_dev(dev_id);
+
+	VALID_DEV_OR_RET_ERR(dev, dev_id);
+	VALID_QUEUE_OR_RET_ERR(queue_id, dev);
+
+	if (stats == NULL) {
+		rte_bbdev_log(ERR, "NULL stats structure");
+		return -EINVAL;
+	}
+
+	*stats = dev->data->queues[queue_id].queue_stats;
+
+	rte_bbdev_log_debug("Retrieved stats for queue %u of device %u",
+			    queue_id, dev_id);
+	return 0;
+}
+
 RTE_EXPORT_SYMBOL(rte_bbdev_info_get)
 int
 rte_bbdev_info_get(uint16_t dev_id, struct rte_bbdev_info *dev_info)
diff --git a/lib/bbdev/rte_bbdev.h b/lib/bbdev/rte_bbdev.h
index 36dabf8fa6..9fcfbf4c69 100644
--- a/lib/bbdev/rte_bbdev.h
+++ b/lib/bbdev/rte_bbdev.h
@@ -316,6 +316,26 @@ rte_bbdev_stats_get(uint16_t dev_id, struct rte_bbdev_stats *stats);
 int
 rte_bbdev_stats_reset(uint16_t dev_id);
 
+/**
+ * Retrieve the statistics of a specific queue.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param queue_id
+ *   The index of the queue.
+ * @param stats
+ *   Pointer to structure to where statistics will be copied. On error, this
+ *   location may or may not have been modified.
+ *
+ * @return
+ *   - 0 on success
+ *   - -ENODEV if dev_id is invalid
+ *   - -EINVAL if stats is NULL
+ *   - -ERANGE if queue_id is out of range
+ */
+__rte_experimental
+int rte_bbdev_queue_stats_get(uint16_t dev_id, uint16_t queue_id, struct rte_bbdev_stats *stats);
+
 /** Device information supplied by the device's driver */
 
 /* Structure rte_bbdev_driver_info 8< */
-- 
2.54.0