Re: [PATCH v4] kni: fix build with Linux 5.18

[Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>]

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.