linux-kernel - Re: [PATCH 10/10] blkcg: implement BPF_PROG_TYPE_IO

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Message-ID: <e4d1df7b-66bb-061a-8ecb-ff1e5be3ab1d@netronome.com>
Date:   Fri, 14 Jun 2019 12:32:09 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Tejun Heo <tj@...nel.org>, axboe@...nel.dk, newella@...com,
        clm@...com, josef@...icpanda.com, dennisz@...com,
        lizefan@...wei.com, hannes@...xchg.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, kafai@...com, songliubraving@...com,
        yhs@...com, bpf@...r.kernel.org
Subject: Re: [PATCH 10/10] blkcg: implement BPF_PROG_TYPE_IO_COST

2019-06-13 18:56 UTC-0700 ~ Tejun Heo <tj@...nel.org>
> Currently, blkcg implements one builtin IO cost model - lienar.  To
> allow customization and experimentation, allow a bpf program to
> override IO cost model.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---

[...]

> diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
> index d672d9086fff..beeac8ac48f3 100644
> --- a/tools/bpf/bpftool/feature.c
> +++ b/tools/bpf/bpftool/feature.c
> @@ -383,6 +383,9 @@ static void probe_kernel_image_config(void)
>  		/* bpftilter module with "user mode helper" */
>  		"CONFIG_BPFILTER_UMH",
>  
> +		/* Block */
> +		"CONFIG_BLK_IO_COST",
> +
>  		/* test_bpf module for BPF tests */
>  		"CONFIG_TEST_BPF",
>  	};
> diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
> index 3d63feb7f852..298e53f35573 100644
> --- a/tools/bpf/bpftool/main.h
> +++ b/tools/bpf/bpftool/main.h
> @@ -74,6 +74,7 @@ static const char * const prog_type_name[] = {
>  	[BPF_PROG_TYPE_SK_REUSEPORT]		= "sk_reuseport",
>  	[BPF_PROG_TYPE_FLOW_DISSECTOR]		= "flow_dissector",
>  	[BPF_PROG_TYPE_CGROUP_SYSCTL]		= "cgroup_sysctl",
> +	[BPF_PROG_TYPE_IO_COST]			= "io_cost",
>  };
>  
>  extern const char * const map_type_name[];

Hi Tejun,

Please make sure to update the documentation and bash
completion when adding the new type to bpftool. You
probably want something like the diff below.

Thanks,
Quentin


diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 228a5c863cc7..0ceae71c07a8 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -40,7 +40,7 @@ PROG COMMANDS
 |              **lwt_seg6local** | **sockops** | **sk_skb** | **sk_msg** | **lirc_mode2** |
 |              **cgroup/bind4** | **cgroup/bind6** | **cgroup/post_bind4** | **cgroup/post_bind6** |
 |              **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6** |
-|              **cgroup/sysctl**
+|              **cgroup/sysctl** | **io_cost**
 |      }
 |       *ATTACH_TYPE* := {
 |              **msg_verdict** | **stream_verdict** | **stream_parser** | **flow_dissector**
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index 2725e27dfa42..057590611e63 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -378,7 +378,7 @@ _bpftool()
                                 cgroup/connect4 cgroup/connect6 \
                                 cgroup/sendmsg4 cgroup/sendmsg6 \
                                 cgroup/post_bind4 cgroup/post_bind6 \
-                                cgroup/sysctl" -- \
+                                cgroup/sysctl io_cost" -- \
                                                    "$cur" ) )
                             return 0
                             ;;
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 1f209c80d906..6ba1d567bf17 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -1070,7 +1070,7 @@ static int do_help(int argc, char **argv)
                "                 sk_reuseport | flow_dissector | cgroup/sysctl |\n"
                "                 cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
                "                 cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
-               "                 cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
+               "                 cgroup/sendmsg4 | cgroup/sendmsg6 | io_cost }\n"
                "       ATTACH_TYPE := { msg_verdict | stream_verdict | stream_parser |\n"
                "                        flow_dissector }\n"
                "       " HELP_SPEC_OPTIONS "\n"