[dpdk-dev] [PATCH v4 2/2] enic: improve out of resources error handling

[John Daley <johndale@cisco.com>]

If configuration fails due to lack of resources, be more specific
about which resources are lacking - work queues, read queues or
completion queues. Return -EINVAL instead of -1 if more queeues
are requested than are available.

Fixes: fefed3d1e62c ("enic: new driver")
Signed-off-by: John Daley <johndale@cisco.com>
---

v4: only modify wq/rq/cq counts on success, return -EINVAL on error.

 drivers/net/enic/enic_main.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 738792e..32ecdae 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -826,22 +826,32 @@ static void enic_dev_deinit(struct enic *enic)
 int enic_set_vnic_res(struct enic *enic)
 {
 	struct rte_eth_dev *eth_dev = enic->rte_dev;
+	int rc = 0;
 
-	if ((enic->rq_count < eth_dev->data->nb_rx_queues) ||
-		(enic->wq_count < eth_dev->data->nb_tx_queues)) {
-		dev_err(dev, "Not enough resources configured, aborting\n");
-		return -1;
+	if (enic->rq_count < eth_dev->data->nb_rx_queues) {
+		dev_err(dev, "Not enough Receive queues. Requested:%u, Configured:%u\n",
+			eth_dev->data->nb_rx_queues, enic->rq_count);
+		rc = -EINVAL;
+	}
+	if (enic->wq_count < eth_dev->data->nb_tx_queues) {
+		dev_err(dev, "Not enough Transmit queues. Requested:%u, Configured:%u\n",
+			eth_dev->data->nb_tx_queues, enic->wq_count);
+		rc = -EINVAL;
 	}
 
-	enic->rq_count = eth_dev->data->nb_rx_queues;
-	enic->wq_count = eth_dev->data->nb_tx_queues;
 	if (enic->cq_count < (enic->rq_count + enic->wq_count)) {
-		dev_err(dev, "Not enough resources configured, aborting\n");
-		return -1;
+		dev_err(dev, "Not enough Completion queues. Required:%u, Configured:%u\n",
+			enic->rq_count + enic->wq_count, enic->cq_count);
+		rc = -EINVAL;
 	}
 
-	enic->cq_count = enic->rq_count + enic->wq_count;
-	return 0;
+	if (rc == 0) {
+		enic->rq_count = eth_dev->data->nb_rx_queues;
+		enic->wq_count = eth_dev->data->nb_tx_queues;
+		enic->cq_count = enic->rq_count + enic->wq_count;
+	}
+
+	return rc;
 }
 
 static int enic_dev_init(struct enic *enic)
-- 
2.7.0