From: Souradeep Chakrabarti <schakrabarti@xxxxxxxxxxxxxxxxxxx>
This patch addresses the VF unload issue, where mana_dealloc_queues()
gets stuck in infinite while loop, because of host unresponsiveness.
It adds a timeout in the while loop, to fix it.
Fixes: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f (net: mana: Add a driver for
Microsoft Azure Network Adapter)
Signed-off-by: Souradeep Chakrabarti <schakrabarti@xxxxxxxxxxxxxxxxxxx>
---
V2 -> V3:
* Splitted the patch in two parts.
* Removed the unnecessary braces from mana_dealloc_queues().
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index d907727c7b7a..cb5c43c3c47e 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -2329,7 +2329,10 @@ static int mana_dealloc_queues(struct net_device *ndev)
{
struct mana_port_context *apc = netdev_priv(ndev);
struct gdma_dev *gd = apc->ac->gdma_dev;
+ unsigned long timeout;
struct mana_txq *txq;
+ struct sk_buff *skb;
+ struct mana_cq *cq;
int i, err;
if (apc->port_is_up)
@@ -2348,13 +2351,25 @@ static int mana_dealloc_queues(struct net_device *ndev)
*
* Drain all the in-flight TX packets
*/
+
+ timeout = jiffies + 120 * HZ;
for (i = 0; i < apc->num_queues; i++) {
txq = &apc->tx_qp[i].txq;
-
- while (atomic_read(&txq->pending_sends) > 0)
+ while (atomic_read(&txq->pending_sends) > 0 &&
+ time_before(jiffies, timeout))
usleep_range(1000, 2000);
}
+ for (i = 0; i < apc->num_queues; i++) {
+ txq = &apc->tx_qp[i].txq;
+ cq = &apc->tx_qp[i].tx_cq;
+ while (atomic_read(&txq->pending_sends)) {
+ skb = skb_dequeue(&txq->pending_skbs);
+ mana_unmap_skb(skb, apc);
+ napi_consume_skb(skb, cq->budget);
+ atomic_sub(1, &txq->pending_sends);
+ }
+ }
/* We're 100% sure the queues can no longer be woken up, because
* we're sure now mana_poll_tx_cq() can't be running.
*/
--
2.34.1
