diff mbox series

[v2] igb: Allocate MSI-X vector when testing

Message ID 20221122131145.68107-1-akihiko.odaki@daynix.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [v2] igb: Allocate MSI-X vector when testing | expand

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Context Check Description
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Akihiko Odaki Nov. 22, 2022, 1:11 p.m. UTC 
Without this change, the interrupt test fail with MSI-X environment:

$ sudo ethtool -t enp0s2 offline
[   43.921783] igb 0000:00:02.0: offline testing starting
[   44.855824] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Down
[   44.961249] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[   51.272202] igb 0000:00:02.0: testing shared interrupt
[   56.996975] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
The test result is FAIL
The test extra info:
Register test  (offline)	 0
Eeprom test    (offline)	 0
Interrupt test (offline)	 4
Loopback test  (offline)	 0
Link test   (on/offline)	 0

Here, "4" means an expected interrupt was not delivered.

This change routes interrupts correctly to the first MSI-X vector, and
fixes the test:

$ sudo ethtool -t enp0s2 offline
[   42.762985] igb 0000:00:02.0: offline testing starting
[   50.141967] igb 0000:00:02.0: testing shared interrupt
[   56.163957] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
The test result is PASS
The test extra info:
Register test  (offline)	 0
Eeprom test    (offline)	 0
Interrupt test (offline)	 0
Loopback test  (offline)	 0
Link test   (on/offline)	 0

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
 drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Maciej Fijalkowski Nov. 22, 2022, 4:26 p.m. UTC | #1 
On Tue, Nov 22, 2022 at 10:11:45PM +0900, Akihiko Odaki wrote:
> Without this change, the interrupt test fail with MSI-X environment:
> 
> $ sudo ethtool -t enp0s2 offline
> [   43.921783] igb 0000:00:02.0: offline testing starting
> [   44.855824] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Down
> [   44.961249] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> [   51.272202] igb 0000:00:02.0: testing shared interrupt
> [   56.996975] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> The test result is FAIL
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 4
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0
> 
> Here, "4" means an expected interrupt was not delivered.
> 
> This change routes interrupts correctly to the first MSI-X vector, and
> fixes the test:

Try to use imperative mood - simply stating something like "To fix this,
route IRQs correctly to the first MSI-X vector by xyz"

> 
> $ sudo ethtool -t enp0s2 offline
> [   42.762985] igb 0000:00:02.0: offline testing starting
> [   50.141967] igb 0000:00:02.0: testing shared interrupt
> [   56.163957] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> The test result is PASS
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 0
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0

Looks better now, would be also good to explain what is the *actual* fix
by explaining the HW registers setting that you're doing.

Thanks!

> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> index e5f3e7680dc6..ff911af16a4b 100644
> --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
> +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> @@ -1413,6 +1413,8 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
>  			*data = 1;
>  			return -1;
>  		}
> +		wr32(E1000_IVAR_MISC, E1000_IVAR_VALID << 8);
> +		wr32(E1000_EIMS, BIT(0));
>  	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
>  		shared_int = false;
>  		if (request_irq(irq,
> -- 
> 2.38.1
>
Maciej Fijalkowski Nov. 23, 2022, 3:33 p.m. UTC | #2 
On Tue, Nov 22, 2022 at 10:11:45PM +0900, Akihiko Odaki wrote:
> Without this change, the interrupt test fail with MSI-X environment:
> 
> $ sudo ethtool -t enp0s2 offline
> [   43.921783] igb 0000:00:02.0: offline testing starting
> [   44.855824] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Down
> [   44.961249] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> [   51.272202] igb 0000:00:02.0: testing shared interrupt
> [   56.996975] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> The test result is FAIL
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 4
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0
> 
> Here, "4" means an expected interrupt was not delivered.
> 
> This change routes interrupts correctly to the first MSI-X vector, and
> fixes the test:

Imperative mood, please - "To fix this, route interrupts correctly..."

> 
> $ sudo ethtool -t enp0s2 offline
> [   42.762985] igb 0000:00:02.0: offline testing starting
> [   50.141967] igb 0000:00:02.0: testing shared interrupt
> [   56.163957] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> The test result is PASS
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 0
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0
> 

You still didn't specify the tree. If it's 'net' and you're not sure about
fixes tag, then please provide some explanation to maintainers why you're
not adding this.

> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> index e5f3e7680dc6..ff911af16a4b 100644
> --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
> +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> @@ -1413,6 +1413,8 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
>  			*data = 1;
>  			return -1;
>  		}
> +		wr32(E1000_IVAR_MISC, E1000_IVAR_VALID << 8);
> +		wr32(E1000_EIMS, BIT(0));
>  	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
>  		shared_int = false;
>  		if (request_irq(irq,
> -- 
> 2.38.1
>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index e5f3e7680dc6..ff911af16a4b 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -1413,6 +1413,8 @@  static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
 			*data = 1;
 			return -1;
 		}
+		wr32(E1000_IVAR_MISC, E1000_IVAR_VALID << 8);
+		wr32(E1000_EIMS, BIT(0));
 	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
 		shared_int = false;
 		if (request_irq(irq,