From: "Topel, Bjorn" <bjorn.topel@intel.com>
To: "Zhang, Helin" <helin.zhang@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "david.marchand@6wind.com" <david.marchand@6wind.com>,
"Wu, Jingjing" <jingjing.wu@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2] i40evf: Report error if HW CRC strip is disabled for Linux PF hosts
Date: Fri, 22 Apr 2016 05:17:17 +0000 [thread overview]
Message-ID: <6B5F13689D63284BBB0B66A5B315C82DBAC621@IRSMSX103.ger.corp.intel.com> (raw)
In-Reply-To: <F35DEAC7BCE34641BA9FAC6BCA4A12E70AA1235E@SHSMSX103.ccr.corp.intel.com>
>> >> + /* For Linux PF hosts, VF has no ability to disable HW CRC strip,
>> >> + * and is implicitly enabled by the PF.
>> >> + */
>> >> + if (!conf->rxmode.hw_strip_crc) {
>> >> + vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
>> >> + if ((vf->version_major == I40E_VIRTCHNL_VERSION_MAJOR) &&
>> >> + (vf->version_minor <= I40E_VIRTCHNL_VERSION_MINOR)) {
>> >> + /* Peer is Linux PF host. */
>> > Can you reword above comments?
>> > It just means the host is not DPDK PF host driver, it could be Linux
>> > driver, and possible others (e.g. FreeBSD, VMWARE?).
>>
>> Sure, I'll reword it! The broader question, however, is this correct for non-
>> Linux/non-DPDK PF drivers?
>> For FreeBSD I'll dig into the code, but for VMWARE (and I'd assume Microsoft
>> Windows) it'll be harder.
>>
>> Do you have any insights on the behavior for the non-open i40e PF drivers?
>>
>> From the documentation [1], it's unclear whether non-Linux/non-DPDK PF
>> drivers are supported. My interpretation was that only DPDK and Linux PF
>> hosts are supported for Fortville NICs.
> I guess only DPDK is different, though I am not sure.
> As all other NIC drivers were developped by the same organization.
> Even assuming that FreeBSD supports both configuration, it will not be a problem,
> as DPDK just doesn't support, and nothing wrong.
I verified against the FreeBSD ixl-1.4.27 driver, and it
behaves (in terms of rxq crcstrip) the same way.
It would be a problem if the non-Linux/non-DPDK drivers had
it (rx crcstrip) *disabled* by default. (Further, being able to
actually change the setting from a VF would be nice as well. :-))
This doesn't seem to be case, though.
So, I'll change the wording from "Linux PF hosts" to "non-DPDK PF
host". Would that be OK?
Björn
next prev parent reply other threads:[~2016-04-22 5:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-14 14:58 [dpdk-dev] [PATCH] i40evf: Ignore disabled HW CRC strip " Björn Töpel
2016-04-15 7:40 ` David Marchand
2016-04-15 8:07 ` Zhang, Helin
2016-04-18 18:47 ` Topel, Bjorn
2016-04-19 2:31 ` Zhang, Helin
2016-04-21 15:02 ` [dpdk-dev] [PATCH v2] i40evf: Report error if HW CRC strip is disabled " Björn Töpel
2016-04-22 1:52 ` Zhang, Helin
2016-04-22 4:54 ` Topel, Bjorn
2016-04-22 5:07 ` Zhang, Helin
2016-04-22 5:17 ` Topel, Bjorn [this message]
2016-04-22 5:18 ` Zhang, Helin
2016-04-22 5:39 ` [dpdk-dev] [PATCH v3] i40evf: Report error if HW CRC strip is disabled for non-DPDK " Björn Töpel
2016-04-29 13:42 ` Zhang, Helin
2016-05-03 10:55 ` Bruce Richardson
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