From: "Wang, Haiyue" <haiyue.wang@intel.com>
To: "Daly, Jeff" <jeffd@silicom-usa.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: Stephen Douthit <stephend@silicom-usa.com>,
"Daly, Jeff" <jeffd@silicom-usa.com>
Subject: RE: [PATCH] net/ixgbe: Retry SFP ID read field to handle misbehaving SFPs
Date: Thu, 17 Mar 2022 07:39:06 +0000 [thread overview]
Message-ID: <BYAPR11MB34957D8AAB5470940C1C38E2F7129@BYAPR11MB3495.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20220307223337.27876-1-jeffd@silicom-usa.com>
> -----Original Message-----
> From: jeffd@silicom-usa.com <jeffd@silicom-usa.com>
> Sent: Tuesday, March 8, 2022 06:34
> To: dev@dpdk.org
> Cc: Stephen Douthit <stephend@silicom-usa.com>; Daly, Jeff <jeffd@silicom-usa.com>; Wang, Haiyue
> <haiyue.wang@intel.com>
> Subject: [PATCH] net/ixgbe: Retry SFP ID read field to handle misbehaving SFPs
>
> From: Stephen Douthit <stephend@silicom-usa.com>
>
> Some XGS-PON SFPs have been observed ACKing I2C reads and returning
> uninitialized garbage while their uC boots. This can lead to the SFP ID
> code marking an otherwise working SFP module as unsupported if a bogus
> ID value is read while its internal PHY/microcontroller is still
> booting.
>
> Retry the ID read several times looking not just for NAK, but also for a
> valid ID field.
>
> Since the device isn't NAKing the trasanction the existing longer retry
> code in ixgbe_read_i2c_byte_generic_int() doesn't apply here.
>
> Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
> Signed-off-by: Jeff Daly <jeffd@silicom-usa.com>
> ---
> drivers/net/ixgbe/base/ixgbe_phy.c | 31 ++++++++++++++++++++++++++----
> 1 file changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ixgbe/base/ixgbe_phy.c b/drivers/net/ixgbe/base/ixgbe_phy.c
> index d8d51d2c3f..27bce066a1 100644
> --- a/drivers/net/ixgbe/base/ixgbe_phy.c
> +++ b/drivers/net/ixgbe/base/ixgbe_phy.c
> @@ -1275,6 +1275,7 @@ s32 ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
> + for (id_reads = 0; id_reads < 5; id_reads++) {
> + status = hw->phy.ops.read_i2c_eeprom(hw,
> + IXGBE_SFF_IDENTIFIER,
> + &identifier);
>
> - if (status != IXGBE_SUCCESS)
> + DEBUGOUT("status %d, id %d\n", status, identifier);
DEBUGOUT("status %d, SFF identifier 0x%x\n", status, identifier);
Since "#define IXGBE_SFF_IDENTIFIER_SFP 0x3" is hex value, and the ID is too simple.
> + if (!status &&
> + identifier == IXGBE_SFF_IDENTIFIER_SFP)
> + break;
> + }
> +
> + if (status != IXGBE_SUCCESS) {
> + DEBUGOUT("Failed SFF ID read (%d attempts)\n", id_reads);
> goto err_read_i2c_eeprom;
> + }
This DEBUGOUT can be removed, it's redundant, every call for hw->phy.ops.read_i2c_eeprom
has added the DEBUOUT.
>
> if (identifier != IXGBE_SFF_IDENTIFIER_SFP) {
> hw->phy.type = ixgbe_phy_sfp_unsupported;
> --
> 2.25.1
next prev parent reply other threads:[~2022-03-17 7:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-07 22:33 jeffd
2022-03-17 6:55 ` Wang, Haiyue
2022-03-17 7:39 ` Wang, Haiyue [this message]
2022-03-22 15:24 ` [PATCH v2] " jeffd
2022-03-23 0:59 ` Wang, Haiyue
2022-03-23 20:03 ` [PATCH v3] " jeffd
2022-03-24 1:00 ` Wang, Haiyue
2022-03-24 8:40 ` Zhang, Qi Z
2022-03-25 9:54 ` [PATCH v4] net/ixgbe: retry SFP ID read " jeffd
2022-03-26 12:15 ` Wang, Haiyue
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