From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 8835AA3179 for ; Thu, 17 Oct 2019 13:06:04 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 567B31E954; Thu, 17 Oct 2019 13:06:03 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 49C371E950 for ; Thu, 17 Oct 2019 13:06:00 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Oct 2019 04:05:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,307,1566889200"; d="scan'208";a="199335174" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga003.jf.intel.com with ESMTP; 17 Oct 2019 04:05:57 -0700 To: Andrew Rybchenko , Ciara Power , mtetsuyah@gmail.com Cc: dev@dpdk.org, Thomas Monjalon References: <20191016154606.39218-1-ciara.power@intel.com> <5b6af628-7101-484b-01db-16272025105f@solarflare.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [RFC] net/null: add empty promiscuous mode functions X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 10/17/2019 11:51 AM, Andrew Rybchenko wrote: > On 10/17/19 1:47 PM, Ferruh Yigit wrote: >> On 10/17/2019 11:37 AM, Andrew Rybchenko wrote: >>> On 10/16/19 9:07 PM, Ferruh Yigit wrote: >>>> On 10/16/2019 4:46 PM, Ciara Power wrote: >>>>> Adding promiscuous functions prevents sample applications failing when run >>>>> on this virtual PMD. The sample applications call promiscuous functions, >>>>> and fail if this function call returns an error, which occurs when the >>>>> virtual PMD does not support the promiscuous function being called. >>>>> >>>>> This change will be implemented for all virtual PMDs that currently do not >>>>> have existing promiscuous functions. Multicast functions will also be >>>>> added for virtual PMDs to prevent sample application breakages here also. >>>> +Andrew >>>> >>>> With the some ethdev APIs returning error code, some sample applications stop >>>> working with virtual interfaces, >>>> >>>> We can, >>>> 1- update sample applications to ignore the errors >>>> 2- Add dummy dev_ops support to (almost all) virtual PMDs (what this RFC suggests) >>>> >>>> (1) puts us back to before the ethdev APIs updated status, and this may be wrong >>>> for the physical devices case, so I am for this RFC. >>>> >>>> Only perhaps we can have some common empty function and keep assigning that one >>>> to reduce the dummy code, what do you think? >>> I don't like the idea to have common empty/dummy functions. >>> If virtual PMD behaves in accordance with enabled promiscuous mode, >>> it should initialize it properly on init: >>>      eth_dev->data->promiscuous = 1; >>> If so, if application requires promiscuous mode, attempt to enable will >>> do nothing. If application requires non-promiscuous mode, disable will >>> fail and it is good. >> It is technically correct that we can't disable promiscuous mode in virtual PMDs >> but I think mainly we don't really care so it returning error may make the >> applications fail/exit unnecessarily with virtual PMDs. > > If I test virtual PMD promiscuous mode, I would prefer enable/disable > callback to say me truth. > > If application really does not care, it should be in the application code. Application can't change this because they may be caring return result for the physical devices. Up until this release these missing dev_ops in virtual PMDs were silently ignored, now APIs are more strict on this (which is good) but to get close the previous behavior for virtual PMDs we need to relax on these features (like saying success on promiscuous disable although it didn't). > >>>>> Signed-off-by: Ciara Power >>>>> --- >>>>> drivers/net/null/rte_eth_null.c | 14 ++++++++++++++ >>>>> 1 file changed, 14 insertions(+) >>>>> >>>>> diff --git a/drivers/net/null/rte_eth_null.c b/drivers/net/null/rte_eth_null.c >>>>> index e2ff41a22..b8472a0cf 100644 >>>>> --- a/drivers/net/null/rte_eth_null.c >>>>> +++ b/drivers/net/null/rte_eth_null.c >>>>> @@ -441,11 +441,25 @@ eth_mac_address_set(__rte_unused struct rte_eth_dev *dev, >>>>> return 0; >>>>> } >>>>> >>>>> +static int >>>>> +eth_dev_promiscuous_enable(__rte_unused struct rte_eth_dev *dev) >>>>> +{ >>>>> + return 0; >>>>> +} >>>>> + >>>>> +static int >>>>> +eth_dev_promiscuous_disable(__rte_unused struct rte_eth_dev *dev) >>>>> +{ >>>>> + return 0; >>>>> +} >>>>> + >>>>> static const struct eth_dev_ops ops = { >>>>> .dev_start = eth_dev_start, >>>>> .dev_stop = eth_dev_stop, >>>>> .dev_configure = eth_dev_configure, >>>>> .dev_infos_get = eth_dev_info, >>>>> + .promiscuous_enable = eth_dev_promiscuous_enable, >>>>> + .promiscuous_disable = eth_dev_promiscuous_disable, >>>>> .rx_queue_setup = eth_rx_queue_setup, >>>>> .tx_queue_setup = eth_tx_queue_setup, >>>>> .rx_queue_release = eth_queue_release, >>>>> >