This is a note to let you know that I've just added the patch titled
net: ena: unmask MSI-X only after device initialization is completed
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-ena-unmask-msi-x-only-after-device-initialization-is-completed.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Feb 28 16:23:28 CET 2018
From: Netanel Belgazal <netanel@xxxxxxxxxx>
Date: Wed, 3 Jan 2018 06:17:29 +0000
Subject: net: ena: unmask MSI-X only after device initialization is completed
From: Netanel Belgazal <netanel@xxxxxxxxxx>
[ Upstream commit 7853b49ce8e0ef6364d24512b287463841d71bd3 ]
Under certain conditions MSI-X interrupt might arrive right after it
was unmasked in ena_up(). There is a chance it would be processed by
the driver before device ENA_FLAG_DEV_UP flag is set. In such a case
the interrupt is ignored.
ENA device operates in auto-masked mode, therefore ignoring
interrupt leaves it masked for good.
Moving unmask of interrupt to be the last step in ena_up().
Signed-off-by: Netanel Belgazal <netanel@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1565,7 +1565,7 @@ static int ena_rss_configure(struct ena_
static int ena_up_complete(struct ena_adapter *adapter)
{
- int rc, i;
+ int rc;
rc = ena_rss_configure(adapter);
if (rc)
@@ -1584,17 +1584,6 @@ static int ena_up_complete(struct ena_ad
ena_napi_enable_all(adapter);
- /* Enable completion queues interrupt */
- for (i = 0; i < adapter->num_queues; i++)
- ena_unmask_interrupt(&adapter->tx_ring[i],
- &adapter->rx_ring[i]);
-
- /* schedule napi in case we had pending packets
- * from the last time we disable napi
- */
- for (i = 0; i < adapter->num_queues; i++)
- napi_schedule(&adapter->ena_napi[i].napi);
-
return 0;
}
@@ -1731,7 +1720,7 @@ create_err:
static int ena_up(struct ena_adapter *adapter)
{
- int rc;
+ int rc, i;
netdev_dbg(adapter->netdev, "%s\n", __func__);
@@ -1774,6 +1763,17 @@ static int ena_up(struct ena_adapter *ad
set_bit(ENA_FLAG_DEV_UP, &adapter->flags);
+ /* Enable completion queues interrupt */
+ for (i = 0; i < adapter->num_queues; i++)
+ ena_unmask_interrupt(&adapter->tx_ring[i],
+ &adapter->rx_ring[i]);
+
+ /* schedule napi in case we had pending packets
+ * from the last time we disable napi
+ */
+ for (i = 0; i < adapter->num_queues; i++)
+ napi_schedule(&adapter->ena_napi[i].napi);
+
return rc;
err_up:
Patches currently in stable-queue which might be from netanel@xxxxxxxxxx are
queue-4.14/net-ena-unmask-msi-x-only-after-device-initialization-is-completed.patch