From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Alejandro Lucero <alejandro.lucero@netronome.com>
Cc: dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] nfp: extend speed capabilities advertised
Date: Mon, 19 Dec 2016 16:43:00 +0000 [thread overview]
Message-ID: <a26f9190-39ee-7f06-be07-80016f60242e@intel.com> (raw)
In-Reply-To: <CAD+H992J5mossfmWG1wq-1YE=12uAQq-R8STX-G42vv13--GBQ@mail.gmail.com>
On 12/19/2016 4:18 PM, Alejandro Lucero wrote:
> On Mon, Dec 19, 2016 at 3:05 PM, Ferruh Yigit <ferruh.yigit@intel.com>
> wrote:
>
>> On 12/19/2016 3:02 PM, Alejandro Lucero wrote:
>>>
>>>
>>> On Mon, Dec 19, 2016 at 2:36 PM, Ferruh Yigit <ferruh.yigit@intel.com
>>> <mailto:ferruh.yigit@intel.com>> wrote:
>>>
>>> Hi Alejandro,
>>>
>>>
>>> Hi,
>>>
>>>
>>> On 12/19/2016 12:05 PM, Alejandro Lucero wrote:
>>> > NFP supports more speeds than just 40 and 100GB, which were
>>> > what was advertised before.
>>> >
>>> > Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com
>> <mailto:alejandro.lucero@netronome.com>>
>>> > ---
>>> > drivers/net/nfp/nfp_net.c | 4 +++-
>>> > 1 file changed, 3 insertions(+), 1 deletion(-)
>>> >
>>> > diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
>>> > index 27afbfd..77015c4 100644
>>> > --- a/drivers/net/nfp/nfp_net.c
>>> > +++ b/drivers/net/nfp/nfp_net.c
>>> > @@ -1077,7 +1077,9 @@ static void nfp_net_read_mac(struct
>> nfp_net_hw *hw)
>>> > dev_info->reta_size = NFP_NET_CFG_RSS_ITBL_SZ;
>>> > dev_info->hash_key_size = NFP_NET_CFG_RSS_KEY_SZ;
>>> >
>>> > - dev_info->speed_capa = ETH_LINK_SPEED_40G |
>> ETH_LINK_SPEED_100G;
>>> > + dev_info->speed_capa = ETH_SPEED_NUM_1G | ETH_LINK_SPEED_10G
>> |
>>> > + ETH_SPEED_NUM_25G | ETH_SPEED_NUM_40G
>> |
>>> > + ETH_SPEED_NUM_50G |
>> ETH_LINK_SPEED_100G;
>>>
>>> Does all devices driver by this driver supports all these speeds?
>>>
>>> I am aware of at least one exception to this, from previous patch
>> [1],
>>> should we take that into account?
>>>
>>>
>>> So we have different NFP devices and different firmwares.
>>> NFP by design support all those speeds, but the PMD relies on the
>>> firmware for being able to know which is the current configured speed
>>> after link negotiation. PMD development was done with a specific
>>> firmware, and I was told to just report such speed by default. Last
>>> firmware versions give that speed info, but old firmware versions do not.
>>>
>>> So, all devices support such a speed range, indeed PMD works with any of
>>> them, but reported speed is always 40G with old firmware. This is a
>>> firmware limitation but we have to support old and new firmware.
>>
>> But this information to the application will be wrong for some (old) FW.
>> What do you think checking the FW version here and report capability
>> based on what FW supports?
>>
>>
> The driver advertises the right speed range supported. The problem is with
> the report about the current link speed configured.
> Maybe, is the right thing to do here to not report the current link speed
> because the driver really does not know about it?
Sorry, confused. Is it like following:
"
For new FW, there is no problem, it supports the range between 1G - 50G,
and reports correct current speed.
With old FW, device still can be set to speed range between 1G - 50G,
but it doesn't report current speed correct, and DPDK driver reports
back to application as device current speed is 40G, without really
knowing the current speed.
"
Thanks,
ferruh
>
> If you agree with this, I'm afraid the just accepted patch about the link
> report needs to be modified.
>
>
>
>>>
>>>
>>>
>>> Also other than that exception, can you please confirm all other
>> devices
>>> support all above speeds?
>>>
>>> [1]
>>> + if ((NFD_CFG_MAJOR_VERSION_of(hw->ver) < 4) ||
>>> + ((NFD_CFG_MINOR_VERSION_of(hw->ver) == 4) &&
>>> + (NFD_CFG_MINOR_VERSION_of(hw->ver) == 0)))
>>> + link.link_speed = ETH_SPEED_NUM_40G;
>>>
>>>
>>> > }
>>> >
>>> > static const uint32_t *
>>> >
>>>
>>>
>>
>>
next prev parent reply other threads:[~2016-12-19 16:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-19 12:05 Alejandro Lucero
2016-12-19 14:36 ` Ferruh Yigit
2016-12-19 15:02 ` Alejandro Lucero
2016-12-19 15:05 ` Ferruh Yigit
2016-12-19 16:18 ` Alejandro Lucero
2016-12-19 16:35 ` Marc
2016-12-19 17:58 ` Alejandro Lucero
2016-12-19 16:43 ` Ferruh Yigit [this message]
2016-12-19 17:59 ` Alejandro Lucero
2016-12-19 18:00 ` Alejandro Lucero
2016-12-20 10:25 ` Ferruh Yigit
2016-12-20 10:29 ` Alejandro Lucero
2016-12-20 11:02 ` Alejandro Lucero
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