[dpdk-dev] [PATCH] ixgbe: return err for too many interrupt queues

[Wang Xiao W]

The lower 16 bits of EICR register are used for queue interrupts,
dpdk framework take over the first bit for other interrupts like
LSC, so there're only 15 bits left for queue interrupts mapping.
This patch adds a check for the num of interrupt queues at
dev_start.

Signed-off-by: Wang Xiao W <xiao.w.wang at intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 5 +++++
 drivers/net/ixgbe/ixgbe_ethdev.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 5812d10..8961454 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -2131,6 +2131,11 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 	     !RTE_ETH_DEV_SRIOV(dev).active) &&
 	    dev->data->dev_conf.intr_conf.rxq != 0) {
 		intr_vector = dev->data->nb_rx_queues;
+		if (intr_vector > IXGBE_MAX_INTR_QUEUE_NUM) {
+			PMD_INIT_LOG(ERR, "At most %d intr queues supported",
+					IXGBE_MAX_INTR_QUEUE_NUM);
+			return -ENOTSUP;
+		}
 		if (rte_intr_efd_enable(intr_handle, intr_vector))
 			return -1;
 	}
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index a7b1eb5..4ff6338 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -59,6 +59,7 @@
 #define IXGBE_VFTA_SIZE 128
 #define IXGBE_VLAN_TAG_SIZE 4
 #define IXGBE_MAX_RX_QUEUE_NUM	128
+#define IXGBE_MAX_INTR_QUEUE_NUM	15
 #define IXGBE_VMDQ_DCB_NB_QUEUES     IXGBE_MAX_RX_QUEUE_NUM
 #define IXGBE_DCB_NB_QUEUES          IXGBE_MAX_RX_QUEUE_NUM
 #define IXGBE_NONE_MODE_TX_NB_QUEUES 64
-- 
1.9.3