diff mbox series

[v4] kni: fix build with Linux 5.18

Message ID 20220601065358.8195-1-jslaby@suse.cz (mailing list archive)
State Accepted, archived
Delegated to: Andrew Rybchenko
Headers
Series [v4] kni: fix build with Linux 5.18 |

Checks

Context Check Description
ci/checkpatch warning coding style issues
ci/iol-aarch64-unit-testing success Testing PASS
ci/iol-x86_64-compile-testing success Testing PASS
ci/iol-aarch64-compile-testing success Testing PASS
ci/iol-x86_64-unit-testing success Testing PASS
ci/iol-abi-testing success Testing PASS

Commit Message

Jiri Slaby June 1, 2022, 6:53 a.m. UTC 
Since commit 2655926aea9b (net: Remove netif_rx_any_context() and
netif_rx_ni().) in 5.18, netif_rx_ni() no longer exists as netif_rx()
can be called from any context. So define HAVE_NETIF_RX_NI for older
releases and call the appropriate function in kni_net.

There were other attempts to fix this:
https://patches.dpdk.org/project/dpdk/patch/20220521070642.35413-1-humin29@huawei.com/
https://patches.dpdk.org/project/dpdk/patch/20220511112334.3233433-1-mingli.yu@windriver.com/

But neither of them ensures netif_rx_ni() is used on older kernel. This
might lead to deadlocks or other problems there.

Cc: stable@dpdk.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
[v4]
- really switch the #if test
[v3]
- reference other patches
- switch the #if test expressions to conform to the checker
[v2]
- forgot to amend the #else/#endif typo fix

 kernel/linux/kni/compat.h  | 4 ++++
 kernel/linux/kni/kni_net.c | 4 ++++
 2 files changed, 8 insertions(+)

Comments

Andrew Rybchenko June 5, 2022, 8:22 a.m. UTC | #1 
On 6/1/22 09:53, Jiri Slaby wrote:
> Since commit 2655926aea9b (net: Remove netif_rx_any_context() and
> netif_rx_ni().) in 5.18, netif_rx_ni() no longer exists as netif_rx()
> can be called from any context. So define HAVE_NETIF_RX_NI for older
> releases and call the appropriate function in kni_net.
> 
> There were other attempts to fix this:
> https://patches.dpdk.org/project/dpdk/patch/20220521070642.35413-1-humin29@huawei.com/
> https://patches.dpdk.org/project/dpdk/patch/20220511112334.3233433-1-mingli.yu@windriver.com/
> 
> But neither of them ensures netif_rx_ni() is used on older kernel. This
> might lead to deadlocks or other problems there.
> 
> Cc: stable@dpdk.org
> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> ---
> [v4]
> - really switch the #if test
> [v3]
> - reference other patches
> - switch the #if test expressions to conform to the checker
> [v2]
> - forgot to amend the #else/#endif typo fix
> 
>   kernel/linux/kni/compat.h  | 4 ++++
>   kernel/linux/kni/kni_net.c | 4 ++++
>   2 files changed, 8 insertions(+)
> 
> diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h
> index 664785674ff1..0db29a4a6f61 100644
> --- a/kernel/linux/kni/compat.h
> +++ b/kernel/linux/kni/compat.h
> @@ -141,3 +141,7 @@
>   #if KERNEL_VERSION(5, 9, 0) > LINUX_VERSION_CODE
>   #define HAVE_TSK_IN_GUP
>   #endif
> +
> +#if KERNEL_VERSION(5, 18, 0) > LINUX_VERSION_CODE
> +#define HAVE_NETIF_RX_NI
> +#endif
> diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
> index 29e5b9e21f9e..a8b092b7567d 100644
> --- a/kernel/linux/kni/kni_net.c
> +++ b/kernel/linux/kni/kni_net.c
> @@ -441,7 +441,11 @@ kni_net_rx_normal(struct kni_dev *kni)
>   		skb->ip_summed = CHECKSUM_UNNECESSARY;
>   
>   		/* Call netif interface */
> +#ifdef HAVE_NETIF_RX_NI
>   		netif_rx_ni(skb);
> +#else
> +		netif_rx(skb);
> +#else
>   
>   		/* Update statistics */
>   		dev->stats.rx_bytes += len;

Applied to dpdk-next-net/main with minor fixes in the description, thanks.
Jiri Slaby June 6, 2022, 5:59 a.m. UTC | #2 
On 05. 06. 22, 10:22, Andrew Rybchenko wrote:
> On 6/1/22 09:53, Jiri Slaby wrote:
>> Since commit 2655926aea9b (net: Remove netif_rx_any_context() and
>> netif_rx_ni().) in 5.18, netif_rx_ni() no longer exists as netif_rx()
>> can be called from any context. So define HAVE_NETIF_RX_NI for older
>> releases and call the appropriate function in kni_net.
>>
>> There were other attempts to fix this:
>> https://patches.dpdk.org/project/dpdk/patch/20220521070642.35413-1-humin29@huawei.com/ 
>>
>> https://patches.dpdk.org/project/dpdk/patch/20220511112334.3233433-1-mingli.yu@windriver.com/ 
>>
>>
>> But neither of them ensures netif_rx_ni() is used on older kernel. This
>> might lead to deadlocks or other problems there.
>>
>> Cc: stable@dpdk.org
>> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
>> ---
>> [v4]
>> - really switch the #if test
>> [v3]
>> - reference other patches
>> - switch the #if test expressions to conform to the checker
>> [v2]
>> - forgot to amend the #else/#endif typo fix
>>
>>   kernel/linux/kni/compat.h  | 4 ++++
>>   kernel/linux/kni/kni_net.c | 4 ++++
>>   2 files changed, 8 insertions(+)
>>
>> diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h
>> index 664785674ff1..0db29a4a6f61 100644
>> --- a/kernel/linux/kni/compat.h
>> +++ b/kernel/linux/kni/compat.h
>> @@ -141,3 +141,7 @@
>>   #if KERNEL_VERSION(5, 9, 0) > LINUX_VERSION_CODE
>>   #define HAVE_TSK_IN_GUP
>>   #endif
>> +
>> +#if KERNEL_VERSION(5, 18, 0) > LINUX_VERSION_CODE
>> +#define HAVE_NETIF_RX_NI
>> +#endif
>> diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
>> index 29e5b9e21f9e..a8b092b7567d 100644
>> --- a/kernel/linux/kni/kni_net.c
>> +++ b/kernel/linux/kni/kni_net.c
>> @@ -441,7 +441,11 @@ kni_net_rx_normal(struct kni_dev *kni)
>>           skb->ip_summed = CHECKSUM_UNNECESSARY;
>>           /* Call netif interface */
>> +#ifdef HAVE_NETIF_RX_NI
>>           netif_rx_ni(skb);
>> +#else
>> +        netif_rx(skb);
>> +#else
>>           /* Update statistics */
>>           dev->stats.rx_bytes += len;
> 
> Applied to dpdk-next-net/main with minor fixes in the description, thanks.

Sorry, it appears I sent the old version again. The latter #else should 
have been #endif. Do you want me to send a followup patch?

thanks,
Andrew Rybchenko June 6, 2022, 4:20 p.m. UTC | #3 
On 6/6/22 08:59, Jiri Slaby wrote:
> On 05. 06. 22, 10:22, Andrew Rybchenko wrote:
>> On 6/1/22 09:53, Jiri Slaby wrote:
>>> Since commit 2655926aea9b (net: Remove netif_rx_any_context() and
>>> netif_rx_ni().) in 5.18, netif_rx_ni() no longer exists as netif_rx()
>>> can be called from any context. So define HAVE_NETIF_RX_NI for older
>>> releases and call the appropriate function in kni_net.
>>>
>>> There were other attempts to fix this:
>>> https://patches.dpdk.org/project/dpdk/patch/20220521070642.35413-1-humin29@huawei.com/ 
>>>
>>> https://patches.dpdk.org/project/dpdk/patch/20220511112334.3233433-1-mingli.yu@windriver.com/ 
>>>
>>>
>>> But neither of them ensures netif_rx_ni() is used on older kernel. This
>>> might lead to deadlocks or other problems there.
>>>
>>> Cc: stable@dpdk.org
>>> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
>>> ---
>>> [v4]
>>> - really switch the #if test
>>> [v3]
>>> - reference other patches
>>> - switch the #if test expressions to conform to the checker
>>> [v2]
>>> - forgot to amend the #else/#endif typo fix
>>>
>>>   kernel/linux/kni/compat.h  | 4 ++++
>>>   kernel/linux/kni/kni_net.c | 4 ++++
>>>   2 files changed, 8 insertions(+)
>>>
>>> diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h
>>> index 664785674ff1..0db29a4a6f61 100644
>>> --- a/kernel/linux/kni/compat.h
>>> +++ b/kernel/linux/kni/compat.h
>>> @@ -141,3 +141,7 @@
>>>   #if KERNEL_VERSION(5, 9, 0) > LINUX_VERSION_CODE
>>>   #define HAVE_TSK_IN_GUP
>>>   #endif
>>> +
>>> +#if KERNEL_VERSION(5, 18, 0) > LINUX_VERSION_CODE
>>> +#define HAVE_NETIF_RX_NI
>>> +#endif
>>> diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
>>> index 29e5b9e21f9e..a8b092b7567d 100644
>>> --- a/kernel/linux/kni/kni_net.c
>>> +++ b/kernel/linux/kni/kni_net.c
>>> @@ -441,7 +441,11 @@ kni_net_rx_normal(struct kni_dev *kni)
>>>           skb->ip_summed = CHECKSUM_UNNECESSARY;
>>>           /* Call netif interface */
>>> +#ifdef HAVE_NETIF_RX_NI
>>>           netif_rx_ni(skb);
>>> +#else
>>> +        netif_rx(skb);
>>> +#else
>>>           /* Update statistics */
>>>           dev->stats.rx_bytes += len;
>>
>> Applied to dpdk-next-net/main with minor fixes in the description, 
>> thanks.
> 
> Sorry, it appears I sent the old version again. The latter #else should 
> have been #endif. Do you want me to send a followup patch?
> 
> thanks,

Oh, I'm sorry as well that I didn't catch it. Frankly speaking I'm
surprised that all CI does not catch it. test-meson-build.sh does
not catch it as well with default. I've tuned my build checks to care
about it.

Thomas, thanks a lot for the quick fix.
diff mbox series

Patch

diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h
index 664785674ff1..0db29a4a6f61 100644
--- a/kernel/linux/kni/compat.h
+++ b/kernel/linux/kni/compat.h
@@ -141,3 +141,7 @@ 
 #if KERNEL_VERSION(5, 9, 0) > LINUX_VERSION_CODE
 #define HAVE_TSK_IN_GUP
 #endif
+
+#if KERNEL_VERSION(5, 18, 0) > LINUX_VERSION_CODE
+#define HAVE_NETIF_RX_NI
+#endif
diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
index 29e5b9e21f9e..a8b092b7567d 100644
--- a/kernel/linux/kni/kni_net.c
+++ b/kernel/linux/kni/kni_net.c
@@ -441,7 +441,11 @@  kni_net_rx_normal(struct kni_dev *kni)
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 		/* Call netif interface */
+#ifdef HAVE_NETIF_RX_NI
 		netif_rx_ni(skb);
+#else
+		netif_rx(skb);
+#else
 
 		/* Update statistics */
 		dev->stats.rx_bytes += len;