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Date: Mon, 19 Jan 2009 19:42:10 +0900
From: ohashi-h@...dnes.nec.co.jp
To: jeffrey.t.kirsher@...el.com
Cc: jesse.brandeburg@...el.com, bruce.w.allan@...el.com,
peter.p.waskiewicz.jr@...el.com, john.ronciak@...el.com,
jgarzik@...ox.com, netdev@...r.kernel.org,
e1000-devel@...ts.sourceforge.net, h-shimamoto@...jp.nec.com
Subject: [PATCH] e1000e: introduce new parameter to disable force-link-up on serdes
From: Hiroki Ohashi <ohashi-h@...dnes.nec.co.jp>
Hi,
ohashi-h@...dnes.nec.co.jp wrote (2008/12/12 16:41:55 +0900 )：
>
>ohashi-h@...dnes.nec.co.jp wrote (2008/12/04 18:24:21 +0900 )：
>>
>>Jeff Kirsher wrote (2008/12/03 17:12:00 +0900 )：
>>
>>>On Tue, Dec 2, 2008 at 11:36 PM, <ohashi-h@...dnes.nec.co.jp> wrote:
>>>> From: Hiroki Ohashi <ohashi-h@...dnes.nec.co.jp>
>>>>
>>>> Hi all,
>>>>
>>>> I faced the following situations.
>>>> The LED of NIC was indicated, even when the system was not linked
>>>> the network (auto-negotiation failed or link partner cannot
>>>> auto-negotiate).
>>>> LED should be indicate only when the network was linked.
>>>> And so, it is a problem that LED indicates.
>>>>
>>>> I think the indicating the LED is a problem for maintenance.
>>>> I cannot know the condition of the link, because I confirm
>>>> to link up by LED's indication.
>>>>
>>>> We are using 82571EB ethernet controler and serdes interface.
>>>>
>...
>
>>>
>>>I am a little confused. You state you are using an NIC (82571EB)
>>>which is currently not supported by e1000, but is supported in the
>>>e1000e driver. Then you suggest a change to the e1000 driver to
>>>resolve an issue you see with your 82571EB NIC.
>>>
>>>So I would suggest you use the e1000e driver first.
>>
>>Thank you, I will try again using e1000e driver.
>>
>>>Also the Link LED is supposed to indicated that there is a "physical"
>>>link, in which case you can have a physical connection and still fail
>>>auto-neg. So I do not necessarily agree with your interpretation of
>>>what a link LED is supposed to indicate.
>>
>>My explanation was insufficiently.
>>My system was NOT connected LAN cable to NIC, but the Link LED
>>was indicated.
>>So the problem is the LED is indicated without connecting the cable.
>>
>
>I tried again using kernel 2.6.27.8 (e1000e driver).
>The LED of NIC was indicated, even when the system was not
>connected LAN cable.
>When I deleted logic of force-link-up (the following modification.),
>the LED was turned off.
>
>I think it is a problem that LED indicates.
>If you have any good way to modify, please let me know.
>(Patches are considering.)
I send the patch to modify.
-------------------------
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Subject: [PATCH] e1000e: introduce new parameter to disable force-link-up on serdes
Introduce new parameter EnableForceLinkOnSERDES to disable force-link-up
on SERDES fablic.
The problem that LED indicates in the following cases is avoided.
- LAN cable was not connected.
- AutoNeg failed (LAN cable is connected).
- Link partner could not auto-neg (LAN cable is connected).
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Signed-off-by: Hiroki Ohashi <ohashi-h@...dnes.nec.co.jp>
Tested-by: Hiroki Ohashi <ohashi-h@...dnes.nec.co.jp>
---
drivers/net/e1000e/hw.h | 1 +
drivers/net/e1000e/lib.c | 4 ++++
drivers/net/e1000e/param.c | 24 ++++++++++++++++++++++++
3 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index f25e961..c051223 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -857,6 +857,7 @@ struct e1000_fc_info {
struct e1000_dev_spec_82571 {
bool laa_is_present;
bool alt_mac_addr_is_present;
+ bool enable_force_link_up;
};
struct e1000_shadow_ram {
diff --git a/drivers/net/e1000e/lib.c b/drivers/net/e1000e/lib.c
index 6674110..6bdac30 100644
--- a/drivers/net/e1000e/lib.c
+++ b/drivers/net/e1000e/lib.c
@@ -539,6 +539,10 @@ s32 e1000e_check_for_serdes_link(struct e1000_hw *hw)
mac->autoneg_failed = 1;
return 0;
}
+ if (!hw->dev_spec.e82571.enable_force_link_up) {
+ hw_dbg(hw, "Force link up disabled.\n");
+ return -E1000_ERR_PHY;
+ }
hw_dbg(hw, "NOT RXing /C/, disable AutoNeg and force link.\n");
/* Disable auto-negotiation in the TXCW register */
diff --git a/drivers/net/e1000e/param.c b/drivers/net/e1000e/param.c
index e909f96..225f006 100644
--- a/drivers/net/e1000e/param.c
+++ b/drivers/net/e1000e/param.c
@@ -161,6 +161,15 @@ E1000_PARAM(WriteProtectNVM, "Write-protect NVM [WARNING: disabling this can lea
E1000_PARAM(CrcStripping, "Enable CRC Stripping, disable if your BMC needs " \
"the CRC");
+/*
+ * Enable Force Link Up on SERDES
+ *
+ * Valid Range: 0, 1
+ *
+ * Default Value: 1 (enabled)
+ */
+E1000_PARAM(EnableForceLinkUpOnSERDES, "Enable force link up SERDES");
+
struct e1000_option {
enum { enable_option, range_option, list_option } type;
const char *name;
@@ -470,4 +479,19 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
}
}
}
+ { /* Enable Force Link Up on SERDES */
+ const struct e1000_option opt = {
+ .type = enable_option,
+ .name = "Enable Force Link Up on SERDES",
+ .err = "defaulting to Enabled",
+ .def = OPTION_ENABLED
+ };
+
+ if (num_EnableForceLinkUpOnSERDES > bd) {
+ unsigned int force_link_up = EnableForceLinkUpOnSERDES[bd];
+ e1000_validate_option(&force_link_up, &opt, adapter);
+ hw->dev_spec.e82571.enable_force_link_up = force_link_up;
+ } else
+ hw->dev_spec.e82571.enable_force_link_up = opt.def;
+ }
}
--
>================================================
>--- drivers/net/e1000e/lib.c.org
>+++ drivers/net/e1000e/lib.c
>@@ -539,8 +539,6 @@ s32 e1000e_check_for_serdes_link(struct
> mac->autoneg_failed = 1;
> return 0;
> }
>+#if 0
> hw_dbg(hw, "NOT RXing /C/, disable AutoNeg and force link.\n");
>
> /* Disable auto-negotiation in the TXCW register */
>@@ -550,7 +548,7 @@ s32 e1000e_check_for_serdes_link(struct
> ctrl = er32(CTRL);
> ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
> ew32(CTRL, ctrl);
>+#endif
>-
> /* Configure Flow Control after forcing link up. */
> ret_val = e1000e_config_fc_after_link_up(hw);
> if (ret_val) {
>================================================
>
Hiroki Ohashi
--
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