netdev - Re: [PATCH net-next 5/5] ebpf: Add sample ebpf program for SOCKET_SG

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Message-ID: <74f959c3-27ef-a67c-6a54-599d84cde90b@oracle.com>
Date:   Wed, 12 Sep 2018 12:32:52 -0700
From:   Tushar Dave <tushar.n.dave@...cle.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        santosh.shilimkar@...cle.com, jakub.kicinski@...ronome.com,
        quentin.monnet@...ronome.com, jiong.wang@...ronome.com,
        sandipan@...ux.vnet.ibm.com, john.fastabend@...il.com,
        kafai@...com, rdna@...com, yhs@...com, netdev@...r.kernel.org,
        rds-devel@....oracle.com, sowmini.varadhan@...cle.com
Subject: Re: [PATCH net-next 5/5] ebpf: Add sample ebpf program for
 SOCKET_SG_FILTER



On 09/11/2018 09:00 PM, Alexei Starovoitov wrote:
> On Tue, Sep 11, 2018 at 09:38:04PM +0200, Tushar Dave wrote:
>> Add a sample program that shows how socksg program is used and attached
>> to socket filter. The kernel sample program deals with struct
>> scatterlist that is passed as bpf context.
>>
>> When run in server mode, the sample RDS program opens PF_RDS socket,
>> attaches eBPF program to RDS socket which then uses bpf_msg_pull_data
>> helper to inspect packet data contained in struct scatterlist and
>> returns appropriate action code back to kernel.
>>
>> To ease testing, RDS client functionality is also added so that users
>> can generate RDS packet.
>>
>> Server:
>> [root@...71 bpf]# ./rds_filter -s 192.168.3.71 -t tcp
>> running server in a loop
>> transport tcp
>> server bound to address: 192.168.3.71 port 4000
>> server listening on 192.168.3.71
>>
>> Client:
>> [root@...70 bpf]# ./rds_filter -s 192.168.3.71 -c 192.168.3.70 -t tcp
>> transport tcp
>> client bound to address: 192.168.3.70 port 25278
>> client sending 8192 byte message  from 192.168.3.70 to 192.168.3.71 on
>> port 25278
>> payload contains:30 31 32 33 34 35 36 37 38 39 ...
>>
>> Server output:
>> 192.168.3.71 received a packet from 192.168.3.71 of len 8192 cmsg len 0,
>> on port 25278
>> payload contains:30 31 32 33 34 35 36 37 38 39 ...
>> server listening on 192.168.3.71
>>
>> [root@...71 tushar]# cat /sys/kernel/debug/tracing/trace_pipe
>>            <idle>-0     [038] ..s.   146.947362: 0: 30 31 32
>>            <idle>-0     [038] ..s.   146.947364: 0: 33 34 35
>>
>> Similarly specifying '-t ib' will run this on IB link.
>>
>> Signed-off-by: Tushar Dave <tushar.n.dave@...cle.com>
>> Acked-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
>> ---
>>   samples/bpf/Makefile          |   3 +
>>   samples/bpf/rds_filter_kern.c |  42 ++++++
>>   samples/bpf/rds_filter_user.c | 339 ++++++++++++++++++++++++++++++++++++++++++
> 
> please no samples.
> Add this as proper test to tools/testing/selftests/bpf
> that reports PASS/FAIL and can be run automatically.
> samples/bpf is effectively dead code.

Okay :(

-Tushar
> 
>