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%3Ba=su...

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@vger.kernel.org know about it.

From foo@baz Wed Feb 28 16:23:28 CET 2018

From: Netanel Belgazal netanel@amazon.com 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@amazon.com

[ 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@amazon.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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@amazon.com are

queue-4.14/net-ena-unmask-msi-x-only-after-device-initialization-is-completed.patch