* [PATCH net-next] net: ena: resolve WARN_ON when freeing IRQs
@ 2025-03-10 8:01 David Arinzon
2025-03-12 14:39 ` Simon Horman
2025-03-12 20:55 ` Ahmed Zaki
0 siblings, 2 replies; 3+ messages in thread
From: David Arinzon @ 2025-03-10 8:01 UTC (permalink / raw)
To: David Miller, Jakub Kicinski, netdev
Cc: David Arinzon, Ahmed Zaki, Eric Dumazet, Paolo Abeni,
Simon Horman, Richard Cochran, Woodhouse, David, Machulsky, Zorik,
Matushevsky, Alexander, Saeed Bshara, Wilson, Matt,
Liguori, Anthony, Bshara, Nafea, Schmeilin, Evgeny,
Belgazal, Netanel, Saidi, Ali, Herrenschmidt, Benjamin,
Kiyanovski, Arthur, Dagan, Noam, Bernstein, Amit, Agroskin, Shay,
Ostrovsky, Evgeny, Tabachnik, Ofir
When IRQs are freed, a WARN_ON is triggered as the
affinity notifier is not released.
This results in the below stack trace:
[ 484.544586] ? __warn+0x84/0x130
[ 484.544843] ? free_irq+0x5c/0x70
[ 484.545105] ? report_bug+0x18a/0x1a0
[ 484.545390] ? handle_bug+0x53/0x90
[ 484.545664] ? exc_invalid_op+0x14/0x70
[ 484.545959] ? asm_exc_invalid_op+0x16/0x20
[ 484.546279] ? free_irq+0x5c/0x70
[ 484.546545] ? free_irq+0x10/0x70
[ 484.546807] ena_free_io_irq+0x5f/0x70 [ena]
[ 484.547138] ena_down+0x250/0x3e0 [ena]
[ 484.547435] ena_destroy_device+0x118/0x150 [ena]
[ 484.547796] __ena_shutoff+0x5a/0xe0 [ena]
[ 484.548110] pci_device_remove+0x3b/0xb0
[ 484.548412] device_release_driver_internal+0x193/0x200
[ 484.548804] driver_detach+0x44/0x90
[ 484.549084] bus_remove_driver+0x69/0xf0
[ 484.549386] pci_unregister_driver+0x2a/0xb0
[ 484.549717] ena_cleanup+0xc/0x130 [ena]
[ 484.550021] __do_sys_delete_module.constprop.0+0x176/0x310
[ 484.550438] ? syscall_trace_enter+0xfb/0x1c0
[ 484.550782] do_syscall_64+0x5b/0x170
[ 484.551067] entry_SYSCALL_64_after_hwframe+0x76/0x7e
Adding a call to `netif_napi_set_irq` with -1 as the IRQ index,
which frees the notifier.
Fixes: de340d8206bf ("net: ena: use napi's aRFS rmap notifers")
Signed-off-by: David Arinzon <darinzon@amazon.com>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 6aab85a7..9e007c60 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1716,8 +1716,12 @@ static void ena_free_io_irq(struct ena_adapter *adapter)
int i;
for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++) {
+ struct ena_napi *ena_napi;
+
irq = &adapter->irq_tbl[i];
irq_set_affinity_hint(irq->vector, NULL);
+ ena_napi = (struct ena_napi *)irq->data;
+ netif_napi_set_irq(&ena_napi->napi, -1);
free_irq(irq->vector, irq->data);
}
}
--
2.47.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH net-next] net: ena: resolve WARN_ON when freeing IRQs
2025-03-10 8:01 [PATCH net-next] net: ena: resolve WARN_ON when freeing IRQs David Arinzon
@ 2025-03-12 14:39 ` Simon Horman
2025-03-12 20:55 ` Ahmed Zaki
1 sibling, 0 replies; 3+ messages in thread
From: Simon Horman @ 2025-03-12 14:39 UTC (permalink / raw)
To: David Arinzon
Cc: David Miller, Jakub Kicinski, netdev, Ahmed Zaki, Eric Dumazet,
Paolo Abeni, Richard Cochran, Woodhouse, David, Machulsky, Zorik,
Matushevsky, Alexander, Saeed Bshara, Wilson, Matt,
Liguori, Anthony, Bshara, Nafea, Schmeilin, Evgeny,
Belgazal, Netanel, Saidi, Ali, Herrenschmidt, Benjamin,
Kiyanovski, Arthur, Dagan, Noam, Bernstein, Amit, Agroskin, Shay,
Ostrovsky, Evgeny, Tabachnik, Ofir
On Mon, Mar 10, 2025 at 10:01:48AM +0200, David Arinzon wrote:
> When IRQs are freed, a WARN_ON is triggered as the
> affinity notifier is not released.
> This results in the below stack trace:
>
> [ 484.544586] ? __warn+0x84/0x130
> [ 484.544843] ? free_irq+0x5c/0x70
> [ 484.545105] ? report_bug+0x18a/0x1a0
> [ 484.545390] ? handle_bug+0x53/0x90
> [ 484.545664] ? exc_invalid_op+0x14/0x70
> [ 484.545959] ? asm_exc_invalid_op+0x16/0x20
> [ 484.546279] ? free_irq+0x5c/0x70
> [ 484.546545] ? free_irq+0x10/0x70
> [ 484.546807] ena_free_io_irq+0x5f/0x70 [ena]
> [ 484.547138] ena_down+0x250/0x3e0 [ena]
> [ 484.547435] ena_destroy_device+0x118/0x150 [ena]
> [ 484.547796] __ena_shutoff+0x5a/0xe0 [ena]
> [ 484.548110] pci_device_remove+0x3b/0xb0
> [ 484.548412] device_release_driver_internal+0x193/0x200
> [ 484.548804] driver_detach+0x44/0x90
> [ 484.549084] bus_remove_driver+0x69/0xf0
> [ 484.549386] pci_unregister_driver+0x2a/0xb0
> [ 484.549717] ena_cleanup+0xc/0x130 [ena]
> [ 484.550021] __do_sys_delete_module.constprop.0+0x176/0x310
> [ 484.550438] ? syscall_trace_enter+0xfb/0x1c0
> [ 484.550782] do_syscall_64+0x5b/0x170
> [ 484.551067] entry_SYSCALL_64_after_hwframe+0x76/0x7e
>
> Adding a call to `netif_napi_set_irq` with -1 as the IRQ index,
> which frees the notifier.
>
> Fixes: de340d8206bf ("net: ena: use napi's aRFS rmap notifers")
> Signed-off-by: David Arinzon <darinzon@amazon.com>
Thanks David,
I agree that having a notifier set should result in a WARN_ON,
and that your patch addresses this problem.
So, the nit below not withstanding this looks good to me.
Reviewed-by: Simon Horman <horms@kernel.org>
> ---
> drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index 6aab85a7..9e007c60 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -1716,8 +1716,12 @@ static void ena_free_io_irq(struct ena_adapter *adapter)
> int i;
>
> for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++) {
> + struct ena_napi *ena_napi;
> +
> irq = &adapter->irq_tbl[i];
> irq_set_affinity_hint(irq->vector, NULL);
> + ena_napi = (struct ena_napi *)irq->data;
nit: I don't think it is necessary to explicitly cast irq->data
to the pointer type of ena_napi because irq->data is a void *.
> + netif_napi_set_irq(&ena_napi->napi, -1);
> free_irq(irq->vector, irq->data);
> }
> }
> --
> 2.47.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH net-next] net: ena: resolve WARN_ON when freeing IRQs
2025-03-10 8:01 [PATCH net-next] net: ena: resolve WARN_ON when freeing IRQs David Arinzon
2025-03-12 14:39 ` Simon Horman
@ 2025-03-12 20:55 ` Ahmed Zaki
1 sibling, 0 replies; 3+ messages in thread
From: Ahmed Zaki @ 2025-03-12 20:55 UTC (permalink / raw)
To: David Arinzon, David Miller, Jakub Kicinski, netdev
Cc: Eric Dumazet, Paolo Abeni, Simon Horman, Richard Cochran,
Woodhouse, David, Machulsky, Zorik, Matushevsky, Alexander,
Saeed Bshara, Wilson, Matt, Liguori, Anthony, Bshara, Nafea,
Schmeilin, Evgeny, Belgazal, Netanel, Saidi, Ali,
Herrenschmidt, Benjamin, Kiyanovski, Arthur, Dagan, Noam,
Bernstein, Amit, Agroskin, Shay, Ostrovsky, Evgeny,
Tabachnik, Ofir
On 2025-03-10 2:01 a.m., David Arinzon wrote:
> When IRQs are freed, a WARN_ON is triggered as the
> affinity notifier is not released.
> This results in the below stack trace:
>
> [ 484.544586] ? __warn+0x84/0x130
> [ 484.544843] ? free_irq+0x5c/0x70
> [ 484.545105] ? report_bug+0x18a/0x1a0
> [ 484.545390] ? handle_bug+0x53/0x90
> [ 484.545664] ? exc_invalid_op+0x14/0x70
> [ 484.545959] ? asm_exc_invalid_op+0x16/0x20
> [ 484.546279] ? free_irq+0x5c/0x70
> [ 484.546545] ? free_irq+0x10/0x70
> [ 484.546807] ena_free_io_irq+0x5f/0x70 [ena]
> [ 484.547138] ena_down+0x250/0x3e0 [ena]
> [ 484.547435] ena_destroy_device+0x118/0x150 [ena]
> [ 484.547796] __ena_shutoff+0x5a/0xe0 [ena]
> [ 484.548110] pci_device_remove+0x3b/0xb0
> [ 484.548412] device_release_driver_internal+0x193/0x200
> [ 484.548804] driver_detach+0x44/0x90
> [ 484.549084] bus_remove_driver+0x69/0xf0
> [ 484.549386] pci_unregister_driver+0x2a/0xb0
> [ 484.549717] ena_cleanup+0xc/0x130 [ena]
> [ 484.550021] __do_sys_delete_module.constprop.0+0x176/0x310
> [ 484.550438] ? syscall_trace_enter+0xfb/0x1c0
> [ 484.550782] do_syscall_64+0x5b/0x170
> [ 484.551067] entry_SYSCALL_64_after_hwframe+0x76/0x7e
>
> Adding a call to `netif_napi_set_irq` with -1 as the IRQ index,
> which frees the notifier.
>
> Fixes: de340d8206bf ("net: ena: use napi's aRFS rmap notifers")
> Signed-off-by: David Arinzon <darinzon@amazon.com>
> ---
> drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index 6aab85a7..9e007c60 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -1716,8 +1716,12 @@ static void ena_free_io_irq(struct ena_adapter *adapter)
> int i;
>
> for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++) {
> + struct ena_napi *ena_napi;
> +
> irq = &adapter->irq_tbl[i];
> irq_set_affinity_hint(irq->vector, NULL);
> + ena_napi = (struct ena_napi *)irq->data;
> + netif_napi_set_irq(&ena_napi->napi, -1);
> free_irq(irq->vector, irq->data);
> }
> }
Thanks for the fix.
Reviewed-by: Ahmed Zaki <ahmed.zaki@intel.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
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