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From: Luca Boccassi <bluca@debian.org>
To: "Zhang, Qi Z" <qi.z.zhang@intel.com>,
	Chas Williams <3chas3@gmail.com>,  "dev@dpdk.org" <dev@dpdk.org>
Cc: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH v3 1/2] net/ixgbe: fix x550 code to handle unidentified PHY
Date: Fri, 09 Nov 2018 13:18:21 +0000
Message-ID: <1541769501.31208.39.camel@debian.org> (raw)
In-Reply-To: <039ED4275CED7440929022BC67E70611532E0FC0@SHSMSX103.ccr.corp.intel.com>

On Wed, 2018-11-07 at 18:27 +0000, Zhang, Qi Z wrote:
> > -----Original Message-----
> > From: Luca Boccassi [mailto:bluca@debian.org]
> > Sent: Wednesday, November 7, 2018 5:55 AM
> > To: Zhang, Qi Z <qi.z.zhang@intel.com>; Chas Williams <3chas3@gmail
> > .com>;
> > dev@dpdk.org
> > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> > <konstantin.ananyev@intel.com>; stable@dpdk.org
> > Subject: Re: [PATCH v3 1/2] net/ixgbe: fix x550 code to handle
> > unidentified
> > PHY
> > 
> > On Tue, 2018-11-06 at 23:31 +0000, Zhang, Qi Z wrote:
> > > > -----Original Message-----
> > > > From: Chas Williams [mailto:3chas3@gmail.com]
> > > > Sent: Monday, November 5, 2018 11:19 AM
> > > > To: Zhang, Qi Z <qi.z.zhang@intel.com>; Luca Boccassi <bluca@de
> > > > bian
> > > > .org>; dev@dpdk.org
> > > > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> > > > <konstantin.ananyev@intel.com>; stable@dpdk.org
> > > > Subject: Re: [PATCH v3 1/2] net/ixgbe: fix x550 code to handle
> > > > unidentified PHY
> > > > 
> > > > 
> > > > 
> > > > On 11/05/2018 12:41 PM, Zhang, Qi Z wrote:
> > > > > 
> > > > > 
> > > > > > -----Original Message-----
> > > > > > From: Luca Boccassi [mailto:bluca@debian.org]
> > > > > > Sent: Friday, November 2, 2018 8:19 AM
> > > > > > To: dev@dpdk.org
> > > > > > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> > > > > > <konstantin.ananyev@intel.com>; Zhang, Qi Z <qi.z.zhang@int
> > > > > > el.c
> > > > > > om>;
> > > > > > 3chas3@gmail.com; Luca Boccassi <bluca@debian.org>; stable@
> > > > > > dpdk
> > > > > > .org
> > > > > > Subject: [PATCH v3 1/2] net/ixgbe: fix x550 code to handle
> > > > > > unidentified PHY
> > > > > > 
> > > > > > ixgbe_identify_sfp_module_X550em() was missing the code to
> > > > > > handle
> > > > > > unidentified PHY that has been there in 82599 so it was not
> > > > > > able to
> > > > > > complete initialization of ixgbe sequence if no sfp plugged
> > > > > > in.
> > > > > > Port it over to return an appropriate type and complete
> > > > > > init
> > > > > > sequence
> > > > > > properly.
> > > > > > 
> > > > > > Fixes: d2e72774e58c ("ixgbe/base: support X550")
> > > > > > Cc: stable@dpdk.org
> > > > > > 
> > > > > > Signed-off-by: Luca Boccassi <bluca@debian.org>
> > > > > > ---
> > > > > > v2: refresh to remove merge conflict with master
> > > > > > v3: coalesce fix into ixgbe_identify_sfp_module_X550em to
> > > > > > avoid
> > > > > >      code duplication, improve comment
> > > > > > 
> > > > > >   drivers/net/ixgbe/base/ixgbe_x550.c | 6 ++++++
> > > > > >   1 file changed, 6 insertions(+)
> > > > > > 
> > > > > > diff --git a/drivers/net/ixgbe/base/ixgbe_x550.c
> > > > > > b/drivers/net/ixgbe/base/ixgbe_x550.c
> > > > > > index f7b98af52..a88d5c86a 100644
> > > > > > --- a/drivers/net/ixgbe/base/ixgbe_x550.c
> > > > > > +++ b/drivers/net/ixgbe/base/ixgbe_x550.c
> > > > > > @@ -1561,6 +1561,12 @@ s32
> > > > 
> > > > ixgbe_identify_sfp_module_X550em(struct
> > > > > > ixgbe_hw *hw)
> > > > > > 
> > > > > >   	status = ixgbe_identify_module_generic(hw);
> > > > > > 
> > > > > > +	/* Set PHY type none if no PHY detected to allow
> > > > > > init
> > > > > > without SFP */
> > > > > > +	if (hw->phy.type == ixgbe_phy_unknown) {
> > > > > > +		hw->phy.type = ixgbe_phy_none;
> > > > > 
> > > > > Set PHY type to none for a device that does have PHY looks
> > > > > weird.
> > > > > does ixgeb_phy_generic works here?
> > > > 
> > > > Yes, it does seem strange but that's what
> > > > ixgbe_identify_sfp_module_generic
> > > > seems to do:
> > > > 
> > > > 	err_read_i2c_eeprom:
> > > > 		hw->phy.sfp_type = ixgbe_sfp_type_not_present;
> > > > 		if (hw->phy.type != ixgbe_phy_nl) {
> > > > 			hw->phy.id = 0;
> > > > 			hw->phy.type = ixgbe_phy_unknown;
> > > > 		}
> > > > 
> > > > The QSFP version a little more forceful:
> > > > 
> > > > 	err_read_i2c_eeprom:
> > > > 		hw->phy.sfp_type = ixgbe_sfp_type_not_present;
> > > > 		hw->phy.id = 0;
> > > > 		hw->phy.type = ixgbe_phy_unknown;
> > > > 
> > > > If we go forward without setting the phy_type to none, we will
> > > > eventually run
> > > > into issues calling other phy routines.
> > > > 
> > > > So should a lack of SFP, reset the PHY type? It's hazy because
> > > > the
> > > > difference
> > > > between PHY and SFP isn't that clear to me here.
> > > 
> > > I'm not sure that's the same case:).
> > > Just feel that it's better to handle ixgbe_phy_unknown directly
> > > for
> > > some device id as a special case than just replace it to
> > > ixgbe_phy_none to cheat the check path, since that rely on we
> > > never
> > > change the way to handle ixgbe_phy_none.
> > > 
> > > So still have the question?
> > > What is the failure if you go with ixgbe_phy_unknown?
> > > Is that possible to work around this like
> > > if (phy_type == ixgbe_phy_unknown && dev_id == xxxx)
> > > 	...
> > 
> > Hi,
> > 
> > Thanks for having a look at this again. If you could please see the
> > other answer, from myself, I've quoted the exact error we see and
> > the
> > issue it causes.
> 
> Yes, I see it failed at eth_ixgbe_dev_init, it will be better if you
> can provide more detail for the call stack, so we can figure out if
> we can work around this by handle ixgbe_phy_unknown directly with
> some special case.

Hi,

The original problem was found and fixed internally a while ago, so
it's taking some time to get hold of the same hardware again. I hope to
get back with more details next week, sorry for the delay.

-- 
Kind regards,
Luca Boccassi

  reply	other threads:[~2018-11-09 13:18 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-15 17:09 [dpdk-dev] [PATCH " Luca Boccassi
2018-08-15 17:09 ` [dpdk-dev] [PATCH 2/2] net/ixgbe: add LHA ID to x550 code Luca Boccassi
2018-09-26 10:22 ` [dpdk-dev] [PATCH 1/2] net/ixgbe: fix x550 code to handle unidentified PHY Luca Boccassi
2018-11-01 14:04 ` Luca Boccassi
2018-11-01 14:04   ` [dpdk-dev] [PATCH 2/2] net/ixgbe: add LHA ID to x550 code Luca Boccassi
2018-11-01 14:41   ` [dpdk-dev] [PATCH 1/2] net/ixgbe: fix x550 code to handle unidentified PHY Luca Boccassi
2018-11-02 14:11   ` Zhang, Qi Z
2018-11-02 15:21     ` Luca Boccassi
2018-11-02 16:49       ` Zhang, Qi Z
2018-11-02 17:08         ` [dpdk-dev] [dpdk-stable] " Luca Boccassi
2018-11-02 15:18 ` [dpdk-dev] [PATCH v3 " Luca Boccassi
2018-11-02 15:18   ` [dpdk-dev] [PATCH v3 2/2] net/ixgbe: add LHA ID to x550 code Luca Boccassi
2018-11-05 17:41   ` [dpdk-dev] [PATCH v3 1/2] net/ixgbe: fix x550 code to handle unidentified PHY Zhang, Qi Z
2018-11-05 18:08     ` [dpdk-dev] [dpdk-stable] " Luca Boccassi
2018-11-05 18:18     ` [dpdk-dev] " Chas Williams
2018-11-06 23:31       ` Zhang, Qi Z
2018-11-07 12:55         ` Luca Boccassi
2018-11-07 18:27           ` Zhang, Qi Z
2018-11-09 13:18             ` Luca Boccassi [this message]
2018-11-20 11:28               ` [dpdk-dev] [dpdk-stable] " Luca Boccassi
2018-11-20 11:27   ` [dpdk-dev] [PATCH v4] net/ixgbe: add LHA ID to x550 code Luca Boccassi
2018-11-20 19:52     ` Zhang, Qi Z
2018-11-20 21:08       ` [dpdk-dev] [dpdk-stable] " Luca Boccassi
2018-11-22 17:54         ` Zhang, Qi Z

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