netdev - Re: bnx2x + SFP+ DA/2.6.33.3: Got bad status 0x0 when reading from SFP+ EEPROM -> SFP+ module is not initialized

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Date:	Fri, 21 May 2010 15:58:33 +0300
From:	"Eilon Greenstein" <eilong@...adcom.com>
To:	"Krzysztof Olędzki" <ole@....pl>
cc:	"Rick Jones" <rick.jones2@...com>,
	"Michael Chan" <mchan@...adcom.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2x + SFP+ DA/2.6.33.3: Got bad status 0x0 when reading
 from SFP+ EEPROM -> SFP+ module is not initialized

On Thu, 2010-05-20 at 13:54 -0700, Krzysztof Olędzki wrote:
> On 2010-05-20 22:25, Rick Jones wrote:
> > Some simple/simplistic thoughts/questions...
> >
> > Has the DAC been used successfully prior to this?
> 
> Yes. It was successfully used to connect two HP switches, before I 
> received SFP+ SR modules, that allowed me to put the switches into 
> distanced rooms.

Krzysztof,

I would like to check in what speed the I2C is running at, and while we
are there, to make sure it is at low speed (100KHz and not 400KHz). Can
you please add this patch and let me know what you see:

diff --git a/drivers/net/bnx2x_link.c b/drivers/net/bnx2x_link.c
index ff70be8..6e05f99 100644
--- a/drivers/net/bnx2x_link.c
+++ b/drivers/net/bnx2x_link.c
@@ -2766,6 +2766,21 @@ static u8
bnx2x_8727_read_sfp_module_eeprom(struct link_params *params,
                      MDIO_PMA_REG_SFP_TWO_WIRE_CTRL,
                      &val);
 
+       /* Make sure we are working in 100KHz */
+       bnx2x_cl45_read(bp, port,
+                     PORT_HW_CFG_XGXS_EXT_PHY_TYPE_BCM8727,
+                     ext_phy_addr,
+                     MDIO_PMA_DEVAD,
+                     8005,
+                     &val);
+       BNX2X_ERR("I2C 2W speed 0x%x, bit 8 %d\n", val, val & 8);
+       bnx2x_cl45_write(bp, port,
+                      ext_phy_type,
+                      ext_phy_addr,
+                      MDIO_PMA_DEVAD,
+                      8005,
+                      val & ~8);
+
        /* Set the read command byte count */
        bnx2x_cl45_write(bp, port,
                       ext_phy_type,

Since we are already off for the weekend, I couldn't find a machine with
this kind of board to test it for myself. On top of that, I don't have
this type of DAC cable, so I need your help in this debug process.

Thanks,
Eilon



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