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From: Thomas Monjalon <thomas@monjalon.net>
To: "Richardson, Bruce" <bruce.richardson@intel.com>
Cc: "Varghese, Vipin" <vipin.varghese@intel.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	"Mcnamara, John" <john.mcnamara@intel.com>,
	"Kovacevic, Marko" <marko.kovacevic@intel.com>,
	Ori Kam <orika@mellanox.com>,
	"Nicolau, Radu" <radu.nicolau@intel.com>,
	Akhil Goyal <akhil.goyal@nxp.com>,
	"Kantecki, Tomasz" <tomasz.kantecki@intel.com>,
	Sunil Kumar Kori <skori@marvell.com>,
	dev@dpdk.org, "Andrzej Ostruszka [C]" <aostruszka@marvell.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	Vamsi Krishna Attunuru <vattunuru@marvell.com>,
	Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>
Subject: Re: [dpdk-dev] [PATCH v4] examples/l2fwd: add cmdline option for	forwarding port info
Date: Sun, 24 May 2020 18:13:22 +0200	[thread overview]
Message-ID: <10969041.qOdnLc68Dm@thomas> (raw)
In-Reply-To: <BYAPR18MB25187F920A6195D7451E7B58DEA10@BYAPR18MB2518.namprd18.prod.outlook.com>

Bruce, as maintainer of l2fwd example, any opinion about this change?


11/05/2020 02:23, Pavan Nikhilesh Bhagavatula:
> Hi Vipin,
> 
> >Hi Pavan,
> >
> >snipped
> >> >
> >> >Should we check & warn the user if
> >> >1. port speed mismatch
> >> >2. on different NUMA
> >> >3. port pairs are physical and vdev like tap, and KNI (performance).
> >> >
> >>
> >> Sure, it can be a separate patch as it will be applicable for multiple
> >examples.
> >I believe this patch is for example `l2fwd`. But you would like to have to
> >updated for all `example`. I am ok for this.
> >
> >snipped
> >> >
> >> >Should not the check_port_pair be after this? If the port is not
> >> >enabled in port_mask will you skip that pair? or skip RX-TX from that
> >port?
> >>
> >> We check every port pair against l2fwd_enabled_port_mask in
> >> check_port_pair_config()
> >
> >
> >>
> >snipped
> >> >
> >> >As mentioned above there can ports in mask which might be
> >disabled for
> >> >port pair. Should not that be skipped rather than setting last port rx-
> >> >tx loopback?
> >>
> >> There could be scenarios where user might want to test 2x10G and
> >1x40G Why
> >> force the user to explicitly mention 1x40G as port pair of itself in the
> >portpair
> >> config?
> >I am not sure if I follow your thought, as your current port map only
> >allows `1:1` mapping by `struct port_pair_params`. This can be to self
> >like `(port0:port0),(port1:port1)` or `(port-0:port-1)`.
> >
> >1. But current `l2fwd_parse_port_pair_config` does not consider the
> >same port mapping as we have hard check for `if (nb_port_pair_params
> >>= RTE_MAX_ETHPORTS/2)`.
> >
> >2. `l2fwd_enabled_port_mask` is global variable of user port mask. This
> >can contain both valid and invalid mask. Hence we check
> >`l2fwd_enabled_port_mask & ~((1 << nb_ports) - 1)`.
> >
> >3. can these scenarios are true if we invoke `check_port_pair_config`
> >before actual port_mask check.
> > a. there are only 4 ports, hence possible mask is `0xf`.
> > b. user passes port argument as `0xe`
> > c. `check_port_pair_config` gets masks for `(1,3)` as input and
> >populates `port_pair_config_mask`.
> > d.  As per the code, port 2 which is valid port and part of user port mask
> >will have lastport (which is port 3)? May be I did understand the logic
> >correct. Can you help me?
> 
> Here user needs to explicitly mention (2,2) for port 2 to be setup else it 
> will be skipped. 
> If you see `check_port_pair_config` below we disable the ports that are not 
> Mentioned in portmap.
> 
> "
> check_port_pair_config(void)
> {
> 
> <snip>
> 		port_pair_config_mask |= port_pair_mask;
> 	}
> 
> 	l2fwd_enabled_port_mask &= port_pair_config_mask;
> 
> 	return 0;
> }
> "
> 
> 
> >
> >So my concerns are 1) there is no same port mapping, 2) my
> >understanding on lastport logic is not clear and 3) as per the code there
> >is 1:N but 1:1.
> >
> >Hence there should be sufficient warning to user if port are of wrong
> >speed and NUMA.
> 
> Unless the user disables stats using -T 0 option all the prints will be skipped.
> 
> >
> >Note: current speed can be fetched only if the port are started too (in
> >Fortville).
> >
> >snipped





  reply	other threads:[~2020-05-24 16:13 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-23 11:56 [dpdk-dev] [PATCH v1 1/1] bus/pci: probe PCI devices in whitelisted order vattunuru
2019-09-25  6:41 ` Slava Ovsiienko
2019-09-25  9:07   ` Gaëtan Rivet
2019-09-26  4:15     ` Vamsi Krishna Attunuru
2019-09-26  8:04       ` Gaëtan Rivet
2019-09-26  9:39         ` [dpdk-dev] [EXT] " Vamsi Krishna Attunuru
2019-09-30 12:51           ` [dpdk-dev] [PATCH v1] eal: add manual probing option Gaetan Rivet
2019-09-30 17:51             ` Aaron Conole
2019-10-01  7:28               ` Gaëtan Rivet
2019-10-01 12:57                 ` Aaron Conole
2019-09-30 18:53             ` Stephen Hemminger
2019-10-01  9:10               ` Gaëtan Rivet
2019-10-01  9:49                 ` Jerin Jacob
2019-10-01 14:09                   ` Gaëtan Rivet
2019-10-01 14:26                     ` Jerin Jacob
2019-10-03  7:58             ` [dpdk-dev] [PATCH v2] " Gaetan Rivet
2019-10-04 12:55               ` [dpdk-dev] [PATCH v3] " Gaetan Rivet
2019-10-07  1:27                 ` Vamsi Krishna Attunuru
2019-10-23  8:44                   ` Gaëtan Rivet
2019-10-25 11:59                 ` Jerin Jacob
2019-10-25 12:50                   ` Gaëtan Rivet
2019-10-25 13:24                     ` Jerin Jacob
2019-10-25 14:41                 ` [dpdk-dev] [PATCH v4] " Gaetan Rivet
2019-10-25 15:01                   ` Jerin Jacob
2019-10-25 15:46                   ` [dpdk-dev] [PATCH v5] " Gaetan Rivet
2019-10-25 15:51                     ` Jerin Jacob
2020-01-22 16:51                     ` Pavan Nikhilesh Bhagavatula
2020-01-23  9:20                       ` Gaetan Rivet
2020-01-23  9:58                     ` [dpdk-dev] [PATCH v7] " Gaetan Rivet
2020-02-03  5:16                       ` Pavan Nikhilesh Bhagavatula
2020-02-03 22:21                         ` Thomas Monjalon
2020-02-04 10:03                           ` Gaetan Rivet
2020-02-04 11:07                             ` Thomas Monjalon
2020-02-04 12:43                               ` Gaetan Rivet
2020-02-04 15:06                                 ` Thomas Monjalon
2020-02-04 16:02                                   ` Gaetan Rivet
2020-02-10 14:51                                     ` Jerin Jacob
2020-02-10 15:27                                       ` Thomas Monjalon
2020-02-10 16:33                                         ` Jerin Jacob
2020-04-03  3:30                                           ` [dpdk-dev] [PATCH] [v1 1/1] examples/l2fwd: add cmdline option for forwarding port info vattunuru
2020-04-03 12:51                                             ` Andrzej Ostruszka [C]
2020-04-05  3:49                                               ` Vamsi Krishna Attunuru
2020-04-05  3:52                                             ` [dpdk-dev] [PATCH] [v2 " vattunuru
2020-04-06  9:32                                               ` Andrzej Ostruszka [C]
2020-04-26 21:19                                               ` Thomas Monjalon
2020-04-27  7:59                                               ` [dpdk-dev] [PATCH v3] " pbhagavatula
2020-04-27  9:19                                                 ` Sunil Kumar Kori
2020-04-27  9:36                                                   ` Andrzej Ostruszka [C]
2020-04-27 10:14                                                     ` Sunil Kumar Kori
2020-04-27 16:38                                                   ` Pavan Nikhilesh Bhagavatula
2020-04-27 16:49                                                     ` Sunil Kumar Kori
2020-04-27 18:31                                                 ` [dpdk-dev] [PATCH v4] " pbhagavatula
2020-04-28  5:54                                                   ` Sunil Kumar Kori
2020-05-01 14:00                                                   ` Varghese, Vipin
2020-05-01 15:14                                                     ` Pavan Nikhilesh Bhagavatula
2020-05-02  4:34                                                       ` Varghese, Vipin
2020-05-11  0:23                                                         ` Pavan Nikhilesh Bhagavatula
2020-05-24 16:13                                                           ` Thomas Monjalon [this message]
2020-05-25  9:29                                                             ` Bruce Richardson
2020-07-04 13:36                                                               ` Jerin Jacob
2020-07-05 12:23                                                                 ` Thomas Monjalon
2020-04-04 16:34                                           ` [dpdk-dev] [EXT] Re: [PATCH v7] eal: add manual probing option Jerin Jacob Kollanukkaran
2023-06-14 19:33                       ` [dpdk-dev] " Stephen Hemminger
2023-06-26 16:12                         ` Gaëtan Rivet

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