[dpdk-dev] [PATCH v3 4/4] vmxnet3: Avoid segfault caused by vmxnet3_dev_tx_queue_setup.

[Nick Zhang]

When we config TX queue with 2048 TX queue size, stop the device,
changed queue size to 4096 and then start the device, there will
be segment fault. We should allocate TX ring for max possible
number of hardware descriptors.

Signed-off-by: Nick Zhang <nic at opencloud.tech>
---
 drivers/net/vmxnet3/vmxnet3_rxtx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index f00b3b9..5f35a2e 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -874,9 +874,10 @@
 	comp_ring->next2proc = 0;
 	comp_ring->gen = VMXNET3_INIT_GEN;
 
-	size = sizeof(struct Vmxnet3_TxDesc) * ring->size;
-	size += sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size;
-	size += sizeof(struct Vmxnet3_TxDataDesc) * data_ring->size;
+	/* Allocate Tx ring for max possible number of hardware descriptors. */
+	size = sizeof(struct Vmxnet3_TxDesc) * VMXNET3_TX_RING_MAX_SIZE;
+	size += sizeof(struct Vmxnet3_TxCompDesc) * VMXNET3_TX_RING_MAX_SIZE;
+	size += sizeof(struct Vmxnet3_TxDataDesc) * VMXNET3_TX_RING_MAX_SIZE;
 
 	mz = ring_dma_zone_reserve(dev, "txdesc", queue_idx, size, socket_id);
 	if (mz == NULL) {
-- 
1.8.3.1