* [PATCH net] igc: Clear old XDP info when changing ring settings
@ 2022-02-04 8:02 ` Kurt Kanzenbach
0 siblings, 0 replies; 6+ messages in thread
From: Kurt Kanzenbach @ 2022-02-04 8:02 UTC (permalink / raw)
To: Vinicius Costa Gomes, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Jakub Kicinski, Alexei Starovoitov,
Daniel Borkmann, Jesper Dangaard Brouer, John Fastabend,
Andre Guedes, Maciej Fijalkowski, Jithu Joseph, Vedang Patel,
intel-wired-lan, netdev, Kurt Kanzenbach
When changing ring sizes the driver triggers kernel warnings in XDP code.
For instance, running 'ethtool -G $interface tx 1024 rx 1024' yields:
|[ 754.838136] Missing unregister, handled but fix driver
|[ 754.838143] WARNING: CPU: 4 PID: 704 at net/core/xdp.c:170 xdp_rxq_info_reg+0x7d/0xe0
The newly allocated ring is copied by memcpy() and still contains the old XDP
information. Therefore, it has to be cleared before allocating new resources
by igc_setup_rx_resources().
Igb does it the same way. Keep the code in sync.
Fixes: 4609ffb9f615 ("igc: Refactor XDP rxq info registration")
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---
drivers/net/ethernet/intel/igc/igc_ethtool.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 8cc077b712ad..93839106504d 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -671,6 +671,10 @@ igc_ethtool_set_ringparam(struct net_device *netdev,
memcpy(&temp_ring[i], adapter->rx_ring[i],
sizeof(struct igc_ring));
+ /* Clear copied XDP RX-queue info */
+ memset(&temp_ring[i].xdp_rxq, 0,
+ sizeof(temp_ring[i].xdp_rxq));
+
temp_ring[i].count = new_rx_count;
err = igc_setup_rx_resources(&temp_ring[i]);
if (err) {
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [Intel-wired-lan] [PATCH net] igc: Clear old XDP info when changing ring settings
@ 2022-02-04 8:02 ` Kurt Kanzenbach
0 siblings, 0 replies; 6+ messages in thread
From: Kurt Kanzenbach @ 2022-02-04 8:02 UTC (permalink / raw)
To: intel-wired-lan
When changing ring sizes the driver triggers kernel warnings in XDP code.
For instance, running 'ethtool -G $interface tx 1024 rx 1024' yields:
|[ 754.838136] Missing unregister, handled but fix driver
|[ 754.838143] WARNING: CPU: 4 PID: 704 at net/core/xdp.c:170 xdp_rxq_info_reg+0x7d/0xe0
The newly allocated ring is copied by memcpy() and still contains the old XDP
information. Therefore, it has to be cleared before allocating new resources
by igc_setup_rx_resources().
Igb does it the same way. Keep the code in sync.
Fixes: 4609ffb9f615 ("igc: Refactor XDP rxq info registration")
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---
drivers/net/ethernet/intel/igc/igc_ethtool.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 8cc077b712ad..93839106504d 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -671,6 +671,10 @@ igc_ethtool_set_ringparam(struct net_device *netdev,
memcpy(&temp_ring[i], adapter->rx_ring[i],
sizeof(struct igc_ring));
+ /* Clear copied XDP RX-queue info */
+ memset(&temp_ring[i].xdp_rxq, 0,
+ sizeof(temp_ring[i].xdp_rxq));
+
temp_ring[i].count = new_rx_count;
err = igc_setup_rx_resources(&temp_ring[i]);
if (err) {
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH net] igc: Clear old XDP info when changing ring settings
2022-02-04 8:02 ` [Intel-wired-lan] " Kurt Kanzenbach
@ 2022-02-04 17:04 ` Nguyen, Anthony L
-1 siblings, 0 replies; 6+ messages in thread
From: Nguyen, Anthony L @ 2022-02-04 17:04 UTC (permalink / raw)
To: Gomes, Vinicius, kurt, Brandeburg, Jesse
Cc: davem, andre.guedes, Joseph, Jithu, john.fastabend, daniel,
Fijalkowski, Maciej, hawk, ast, kuba, vedang.patel,
intel-wired-lan, netdev
Hi Kurt,
On Fri, 2022-02-04 at 09:02 +0100, Kurt Kanzenbach wrote:
> When changing ring sizes the driver triggers kernel warnings in XDP
> code.
>
> For instance, running 'ethtool -G $interface tx 1024 rx 1024' yields:
>
> > [ 754.838136] Missing unregister, handled but fix driver
> > [ 754.838143] WARNING: CPU: 4 PID: 704 at net/core/xdp.c:170
> > xdp_rxq_info_reg+0x7d/0xe0
>
> The newly allocated ring is copied by memcpy() and still contains the
> old XDP
> information. Therefore, it has to be cleared before allocating new
> resources
> by igc_setup_rx_resources().
>
> Igb does it the same way. Keep the code in sync.
Thanks for the patch, but we have a patch[1] to resolve this issue in a
more preferred method. igb is actually changing as well to this new
solution [2].
Thanks,
Tony
[1] https://patchwork.ozlabs.org/patch/1581816/
[2] https://patchwork.ozlabs.org/patch/1581815/
> Fixes: 4609ffb9f615 ("igc: Refactor XDP rxq info registration")
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Intel-wired-lan] [PATCH net] igc: Clear old XDP info when changing ring settings
@ 2022-02-04 17:04 ` Nguyen, Anthony L
0 siblings, 0 replies; 6+ messages in thread
From: Nguyen, Anthony L @ 2022-02-04 17:04 UTC (permalink / raw)
To: intel-wired-lan
Hi Kurt,
On Fri, 2022-02-04 at 09:02 +0100, Kurt Kanzenbach wrote:
> When changing ring sizes the driver triggers kernel warnings in XDP
> code.
>
> For instance, running 'ethtool -G $interface tx 1024 rx 1024' yields:
>
> > [? 754.838136] Missing unregister, handled but fix driver
> > [? 754.838143] WARNING: CPU: 4 PID: 704 at net/core/xdp.c:170
> > xdp_rxq_info_reg+0x7d/0xe0
>
> The newly allocated ring is copied by memcpy() and still contains the
> old XDP
> information. Therefore, it has to be cleared before allocating new
> resources
> by igc_setup_rx_resources().
>
> Igb does it the same way. Keep the code in sync.
Thanks for the patch, but we have a patch[1] to resolve this issue in a
more preferred method. igb is actually changing as well to this new
solution [2].
Thanks,
Tony
[1] https://patchwork.ozlabs.org/patch/1581816/
[2] https://patchwork.ozlabs.org/patch/1581815/
> Fixes: 4609ffb9f615 ("igc: Refactor XDP rxq info registration")
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH net] igc: Clear old XDP info when changing ring settings
2022-02-04 17:04 ` [Intel-wired-lan] " Nguyen, Anthony L
@ 2022-02-05 9:57 ` Kurt Kanzenbach
-1 siblings, 0 replies; 6+ messages in thread
From: Kurt Kanzenbach @ 2022-02-05 9:57 UTC (permalink / raw)
To: Nguyen, Anthony L, Gomes, Vinicius, Brandeburg, Jesse
Cc: davem, andre.guedes, Joseph, Jithu, john.fastabend, daniel,
Fijalkowski, Maciej, hawk, ast, kuba, vedang.patel,
intel-wired-lan, netdev
[-- Attachment #1: Type: text/plain, Size: 231 bytes --]
On Fri Feb 04 2022, Anthony L. Nguyen wrote:
> Thanks for the patch, but we have a patch[1] to resolve this issue in a
> more preferred method. igb is actually changing as well to this new
> solution [2].
OK, great.
Thanks,
Kurt
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [Intel-wired-lan] [PATCH net] igc: Clear old XDP info when changing ring settings
@ 2022-02-05 9:57 ` Kurt Kanzenbach
0 siblings, 0 replies; 6+ messages in thread
From: Kurt Kanzenbach @ 2022-02-05 9:57 UTC (permalink / raw)
To: intel-wired-lan
On Fri Feb 04 2022, Anthony L. Nguyen wrote:
> Thanks for the patch, but we have a patch[1] to resolve this issue in a
> more preferred method. igb is actually changing as well to this new
> solution [2].
OK, great.
Thanks,
Kurt
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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2022-02-04 8:02 [PATCH net] igc: Clear old XDP info when changing ring settings Kurt Kanzenbach
2022-02-04 8:02 ` [Intel-wired-lan] " Kurt Kanzenbach
2022-02-04 17:04 ` Nguyen, Anthony L
2022-02-04 17:04 ` [Intel-wired-lan] " Nguyen, Anthony L
2022-02-05 9:57 ` Kurt Kanzenbach
2022-02-05 9:57 ` [Intel-wired-lan] " Kurt Kanzenbach
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