netdev - Re: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for the i210.

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Date:	Tue, 28 May 2013 18:23:25 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	"Vick, Matthew" <matthew.vick@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"Keller, Jacob E" <jacob.e.keller@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for the
 i210.

On Tue, May 28, 2013 at 03:58:07PM +0000, Vick, Matthew wrote:
> On 5/27/13 2:21 AM, "Richard Cochran" <richardcochran@...il.com> wrote:
 
> I would prefer it if we did a MAC check before these two TSICR checks,
> since we're making some assumptions about the hardware within the
> interrupt cases. At the very least, a comment that these are only
> applicable to I210/I211 would be nice.

I can respin with a comment that the additional bits are i210 only. I
think this is better than adding more checks into ISR. Since we only
enable these bits for the i210, the checks would be redundant.

> >diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c
> >b/drivers/net/ethernet/intel/igb/igb_ptp.c
> >index 5944de0..8cf4b8a 100644
> >--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
> >+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
> >@@ -23,6 +23,15 @@
> > 
> > #include "igb.h"
> > 
> >+static int igb_input_sdp = 0;
> >+static int igb_output_sdp = 1;
> >+module_param(igb_input_sdp, int, 0444);
> >+module_param(igb_output_sdp, int, 0444);
> >+MODULE_PARM_DESC(igb_input_sdp,
> >+		 "The SDP used as an input, to time stamp external events");
> >+MODULE_PARM_DESC(igb_output_sdp,
> >+		 "The SDP used to output the programmable periodic signal");
> >+
> 
> Is there any other mechanism we could use to control this? I would imagine
> not, but I know module parameters are generally frowned upon.

This the way I handled it for the PHYTER, and I think it is the best
way from our three choices:

1. kconfig option (inflexible)
2. module param
3. ethtool (can o'worms)

> >@@ -711,6 +800,68 @@ int igb_ptp_hwtstamp_ioctl(struct net_device *netdev,
> > 		-EFAULT : 0;
> > }
> > 
> >+static int igb_sdp_init(struct igb_adapter *adapter)
> >+{
> >+	struct e1000_hw *hw = &adapter->hw;
> >+	u32 ctrl, ctrl_ext, tssdp = 0;
> >+
> >+	if (igb_input_sdp == igb_output_sdp) {
> >+		pr_err("SDP %d set as both input and output\n", igb_input_sdp);
> >+		return -1;
> 
> Shouldn't this return -EINVAL?

Maybe we don't need the return value at all. Just the message is
important, I think.
 
> >@@ -785,6 +936,10 @@ void igb_ptp_init(struct igb_adapter *adapter)
> > 		struct timespec ts = ktime_to_timespec(ktime_get_real());
> > 
> > 		igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
> >+		igb_sdp_init(adapter);
> 
> What if igb_sdp_init fails?

Hmm, maybe we should then disable the extra features... will consider
for V2.

> >+		adapter->ptp_caps.n_ext_ts = 1;
> >+		adapter->ptp_caps.n_per_out = 1;
> >+		adapter->ptp_caps.pps = 1;

Thanks,
Richard
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