[PATCH 9/9] net/gve: restrict max ring size in GQ QPL to 2K

[Joshua Washington]

The GQ QPL queue format has a maximum supported ring size of 2k.
However, it is possible in some cases for the device to pass a larger
ring size as the max ring size. Restrict the ring size in the driver to
ensure that rings with invalid queue depths are not created.

Fixes: cde01d164f8f ("net/gve: support modifying ring size in GQ format")
Cc: stable at dpdk.org
Signed-off-by: Joshua Washington <joshwash at google.com>
Reviewed-by: Jasper Tran O'Leary <jtranoleary at google.com>
---
 drivers/net/gve/base/gve_adminq.c | 12 +++++++++---
 drivers/net/gve/gve_ethdev.h      |  1 +
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/gve/base/gve_adminq.c b/drivers/net/gve/base/gve_adminq.c
index 2b25c7f390..315e2456fd 100644
--- a/drivers/net/gve/base/gve_adminq.c
+++ b/drivers/net/gve/base/gve_adminq.c
@@ -6,6 +6,7 @@
 #include "../gve_ethdev.h"
 #include "gve_adminq.h"
 #include "gve_register.h"
+#include "rte_common.h"
 
 #define GVE_MAX_ADMINQ_RELEASE_CHECK	500
 #define GVE_ADMINQ_SLEEP_LEN		20
@@ -946,15 +947,20 @@ static void
 gve_set_max_desc_cnt(struct gve_priv *priv,
 	const struct gve_device_option_modify_ring *modify_ring)
 {
+	priv->max_rx_desc_cnt = be16_to_cpu(modify_ring->max_ring_size.rx);
+	priv->max_tx_desc_cnt = be16_to_cpu(modify_ring->max_ring_size.tx);
+
 	if (priv->queue_format == GVE_DQO_RDA_FORMAT) {
 		PMD_DRV_LOG(DEBUG, "Overriding max ring size from device for DQ "
 			    "queue format to 4096.");
 		priv->max_rx_desc_cnt = GVE_MAX_QUEUE_SIZE_DQO;
 		priv->max_tx_desc_cnt = GVE_MAX_QUEUE_SIZE_DQO;
-		return;
+	} else if (priv->queue_format == GVE_GQI_QPL_FORMAT) {
+		priv->max_rx_desc_cnt = RTE_MIN(priv->max_rx_desc_cnt,
+						GVE_MAX_RING_SIZE_GQ_QPL);
+		priv->max_tx_desc_cnt = RTE_MIN(priv->max_tx_desc_cnt,
+						GVE_MAX_RING_SIZE_GQ_QPL);
 	}
-	priv->max_rx_desc_cnt = be16_to_cpu(modify_ring->max_ring_size.rx);
-	priv->max_tx_desc_cnt = be16_to_cpu(modify_ring->max_ring_size.tx);
 }
 
 static void gve_enable_supported_features(struct gve_priv *priv,
diff --git a/drivers/net/gve/gve_ethdev.h b/drivers/net/gve/gve_ethdev.h
index 4a7e5ecdf3..c9a176ff17 100644
--- a/drivers/net/gve/gve_ethdev.h
+++ b/drivers/net/gve/gve_ethdev.h
@@ -21,6 +21,7 @@
 #define DQO_TX_MULTIPLIER 4
 
 #define GVE_DEFAULT_MAX_RING_SIZE	1024
+#define GVE_MAX_RING_SIZE_GQ_QPL	2048
 #define GVE_DEFAULT_MIN_RX_RING_SIZE	512
 #define GVE_DEFAULT_MIN_TX_RING_SIZE	256
 
-- 
2.55.0.rc0.799.gd6f94ed593-goog