<snip>

Hi Chengwen,

While testing the IOAT driver I realised that we hadn't implemented the new RTE_DMADEV_ALL_VCHAN
flag for stats. Rather than every driver that only supports 1 vchan enabling support for this flag it would
probably be better to catch it in the library as shown below.

Thanks,
Conor.

+int
+rte_dmadev_stats_get(uint16_t dev_id, uint16_t vchan,
+		     struct rte_dmadev_stats *stats)
+{
+	const struct rte_dmadev *dev = &rte_dmadevices[dev_id];
+
+	RTE_DMADEV_VALID_DEV_ID_OR_ERR_RET(dev_id, -EINVAL);
+	if (stats == NULL)
+		return -EINVAL;
+	if (vchan >= dev->data->dev_conf.nb_vchans &&
+	    vchan != RTE_DMADEV_ALL_VCHAN) {
+		RTE_DMADEV_LOG(ERR,
+			"Device %u vchan %u out of range", dev_id, vchan);
+		return -EINVAL;
+	}

	if (vchan == RTE_DMADEV_ALL_VCHAN && dev->data->dev_conf.nb_vchans == 1)
		vchan = 0;

+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->stats_get, -
ENOTSUP);
+	memset(stats, 0, sizeof(struct rte_dmadev_stats));
+	return (*dev->dev_ops->stats_get)(dev, vchan, stats,
+					  sizeof(struct rte_dmadev_stats));
+}
+
+int
+rte_dmadev_stats_reset(uint16_t dev_id, uint16_t vchan)
+{
+	struct rte_dmadev *dev = &rte_dmadevices[dev_id];
+
+	RTE_DMADEV_VALID_DEV_ID_OR_ERR_RET(dev_id, -EINVAL);
+	if (vchan >= dev->data->dev_conf.nb_vchans &&
+	    vchan != RTE_DMADEV_ALL_VCHAN) {
+		RTE_DMADEV_LOG(ERR,
+			"Device %u vchan %u out of range", dev_id, vchan);
+		return -EINVAL;
+	}

	if (vchan == RTE_DMADEV_ALL_VCHAN && dev->data->dev_conf.nb_vchans == 1)
		vchan = 0;

+
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->stats_reset, -
ENOTSUP);
+	return (*dev->dev_ops->stats_reset)(dev, vchan);
+}

<snip>