netdev - Re: [PATCH iproute2-next 2/2] tc: add new attr TCA_EXT_WARN

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Date:   Fri, 13 Jan 2023 12:00:28 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 2/2] tc: add new attr TCA_EXT_WARN_MSG

Hi David,

Oh, I forgot to add --no-thread when send this patch. Sorry if this makes
any trouble for you.

Hangbin

On Fri, Jan 13, 2023 at 11:46:17AM +0800, Hangbin Liu wrote:
> Currently, when the rule is not to be exclusively executed by the
> hardware, extack is not passed along and offloading failures don't
> get logged. Add a new attr TCA_EXT_WARN_MSG to log the extack message
> so we can monitor the HW failures. e.g.
> 
>   # tc monitor
>   added chain dev enp3s0f1np1 parent ffff: chain 0
>   added filter dev enp3s0f1np1 ingress protocol all pref 49152 flower chain 0 handle 0x1
>     ct_state +trk+new
>     not_in_hw
>           action order 1: gact action drop
>            random type none pass val 0
>            index 1 ref 1 bind 1
> 
>   Warning: mlx5_core: matching on ct_state +new isn't supported.
> 
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  include/uapi/linux/rtnetlink.h | 1 +
>  tc/m_action.c                  | 6 ++++++
>  tc/tc_filter.c                 | 5 +++++
>  tc/tc_qdisc.c                  | 6 ++++++
>  4 files changed, 18 insertions(+)
> 
> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
> index f4a540c0..217b25b9 100644
> --- a/include/uapi/linux/rtnetlink.h
> +++ b/include/uapi/linux/rtnetlink.h
> @@ -635,6 +635,7 @@ enum {
>  	TCA_INGRESS_BLOCK,
>  	TCA_EGRESS_BLOCK,
>  	TCA_DUMP_FLAGS,
> +	TCA_EXT_WARN_MSG,
>  	__TCA_MAX
>  };
>  
> diff --git a/tc/m_action.c b/tc/m_action.c
> index b3fd0193..7121c2fb 100644
> --- a/tc/m_action.c
> +++ b/tc/m_action.c
> @@ -590,6 +590,12 @@ int print_action(struct nlmsghdr *n, void *arg)
>  
>  	open_json_object(NULL);
>  	tc_dump_action(fp, tb[TCA_ACT_TAB], tot_acts ? *tot_acts:0, false);
> +
> +	if (tb[TCA_EXT_WARN_MSG]) {
> +		print_string(PRINT_ANY, "Warn", "%s ", rta_getattr_str(tb[TCA_EXT_WARN_MSG]));
> +		print_nl();
> +	}
> +
>  	close_json_object();
>  
>  	return 0;
> diff --git a/tc/tc_filter.c b/tc/tc_filter.c
> index 71be2e81..dac74f58 100644
> --- a/tc/tc_filter.c
> +++ b/tc/tc_filter.c
> @@ -371,6 +371,11 @@ int print_filter(struct nlmsghdr *n, void *arg)
>  		print_nl();
>  	}
>  
> +	if (tb[TCA_EXT_WARN_MSG]) {
> +		print_string(PRINT_ANY, "Warn", "%s ", rta_getattr_str(tb[TCA_EXT_WARN_MSG]));
> +		print_nl();
> +	}
> +
>  	close_json_object();
>  	fflush(fp);
>  	return 0;
> diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
> index 33a6665e..a84602b4 100644
> --- a/tc/tc_qdisc.c
> +++ b/tc/tc_qdisc.c
> @@ -346,6 +346,12 @@ int print_qdisc(struct nlmsghdr *n, void *arg)
>  			print_nl();
>  		}
>  	}
> +
> +	if (tb[TCA_EXT_WARN_MSG]) {
> +		print_string(PRINT_ANY, "Warn", "%s ", rta_getattr_str(tb[TCA_EXT_WARN_MSG]));
> +		print_nl();
> +	}
> +
>  	close_json_object();
>  	fflush(fp);
>  	return 0;
> -- 
> 2.38.1
>