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b=y/BGQ1eYBiDsakYcfOKWJTPYYnK+M1E5mM4IgUMa4Triu9jramkVliAwNfgSvBKIK4OgvpfLzS/MmMXvddrl/L5H5R2wER67Zx784t0j9j1A8jK7vavX3BOJfxnzeARc9p1+Q3Xyn4B/YDdthjfSGMmGAUf9Qtt0dl25ORQzACA= Received: from CH2PR12MB4294.namprd12.prod.outlook.com (2603:10b6:610:a9::11) by SN7PR12MB6672.namprd12.prod.outlook.com (2603:10b6:806:26c::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7409.46; Wed, 3 Apr 2024 12:20:08 +0000 Received: from CH2PR12MB4294.namprd12.prod.outlook.com ([fe80::282f:29d3:cac1:cde3]) by CH2PR12MB4294.namprd12.prod.outlook.com ([fe80::282f:29d3:cac1:cde3%7]) with mapi id 15.20.7409.042; Wed, 3 Apr 2024 12:20:08 +0000 Message-ID: <6303f2bf-fc5c-46dd-bcac-f79c0c824a02@amd.com> Date: Wed, 3 Apr 2024 13:20:03 +0100 User-Agent: Mozilla Thunderbird Subject: Re: Issues around packet capture when secondary process is doing rx/tx To: Konstantin Ananyev <konstantin.ananyev@huawei.com>, Stephen Hemminger <stephen@networkplumber.org> Cc: "dev@dpdk.org" <dev@dpdk.org>, "arshdeep.kaur@intel.com" <arshdeep.kaur@intel.com>, "Gowda, Sandesh" <sandesh.gowda@intel.com>, Reshma Pattan <reshma.pattan@intel.com> References: <20240107175900.1276c0a5@hermes.local> <5c28d2a26f5142c3a509cc8bda2fca75@huawei.com> <20240109150611.00d13e13@hermes.local> <59dfbb6360104c348b4eb3dc767b0233@huawei.com> Content-Language: en-US From: Ferruh Yigit <ferruh.yigit@amd.com> Autocrypt: addr=ferruh.yigit@amd.com; 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arshdeep.kaur@intel.com; Gowda, Sandesh <sandesh.gowda@intel.com>; Reshma Pattan >> <reshma.pattan@intel.com> >> Subject: Re: Issues around packet capture when secondary process is doing rx/tx >> >> On Mon, 8 Jan 2024 15:13:25 +0000 >> Konstantin Ananyev <konstantin.ananyev@huawei.com> wrote: >> >>>> I have been looking at a problem reported by Sandesh >>>> where packet capture does not work if rx/tx burst is done in secondary process. >>>> >>>> The root cause is that existing rx/tx callback model just doesn't work >>>> unless the process doing the rx/tx burst calls is the same one that >>>> registered the callbacks. >>>> >>>> An example sequence would be: >>>> 1. dumpcap (or pdump) as secondary tells pdump in primary to register callback >>>> 2. secondary process calls rx_burst. >>>> 3. rx_burst sees the callback but it has pointer pdump_rx which is not necessarily >>>> at same location in primary and secondary process. >>>> 4. indirect function call in secondary to bad location likely causes crash. >>> >>> As I remember, RX/TX callbacks were never intended to work over multiple processes. >>> Right now RX/TX callbacks are private for the process, different process simply should not >>> see/execute them. >>> I.E. it callbacks list is part of 'struct rte_eth_dev' itself, not the rte_eth_dev.data that is shared >>> between processes. >>> It should be normal, wehn for the same port/queue you will end-up with different list of callbacks >>> for different processes. >>> So, unless I am missing something, I don't see how we can end-up with 3) and 4) from above: >>> From my understanding secondary process will never see/call primary's callbacks. >>> >>> About pdump itself, it was a while when I looked at it last time, but as I remember to start it to work, >>> server process has to call rte_pdump_init() which in terns register PDUMP_MP handler. >>> I suppose for the secondary process to act as a 'pdump server' it needs to call rte_pdump_init() itself, >>> though I am not sure such option is supported right now. >>> >> >> Did some more tests with modified testpmd, and reached some conclusions: >> >> The logical interface would be to allow rte_pdump_init() to be called by >> the process that would be using rx/tx burst API's. >> >> This doesn't work as it should because the multi-process socket API >> assumes that the it only runs the server in primary. The secondary >> can start its own MP thread, but it won't work: >> >> Primary EAL: Multi-process socket /var/run/dpdk/rte/mp_socket >> Secondary: EAL: Multi-process socket /var/run/dpdk/rte/mp_socket_6057_1ccd4157fd5 >> >> The problem is when client (pdump or dumpcap) tries to run, it uses the mp_socket >> in the primary which causes: EAL: Cannot find action: mp_pdump >> >> Looks like the whole MP socket mechanism is just not up to this. >> >> Maybe pdump needs to have its own socket and control thread? >> Or MP socket needs to have some multicast fanout to all secondaries? > > Might be we can do something simpler: pass to pdump_enable(), where we want to enable it: > on primary (remote_ process or secondary (local) process? > And then for primary send a message over MP socket (as we doing now), and for secondary (itself) > just do actual pdump enablement on it's own (install callbacks, etc.). > Yes, in that way, one secondary would not be able to enable/idable pdump on another secondary, > only on itself, but might be it is not needed? > > How secondary, lets say testpmd secondary, install callbacks without getting 'mp' & 'ring' info from pdump secondary process?