netdev - [PATCH] sfp: Add support for DWDM SFP modules

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Message-Id: <5226d9535b31269e0388b781ef815ee2183ee3b9.1510745986.git.jan.kundrat@cesnet.cz>
Date:   Wed, 15 Nov 2017 12:39:33 +0100
From:   Jan Kundrát <jan.kundrat@...net.cz>
To:     netdev@...r.kernel.org
Cc:     Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH] sfp: Add support for DWDM SFP modules

Without this patch, but with CONFIG_SFP enabled, my NIC won't detect
module unplugging, which is suboptimal.

I'm using an OEM "Cisco compatible" DWDM fixed-frequency 100Ghz-grid SFP
module. It reports itself as a 0x0b 0x24. According to SFF-8024, byte 0
value "0Bh" refers to a "DWDM-SFP/SFP+ (not using SFF-8472)". In
practice, there's a lot of shared properties here.

Everything is apparently defined in a document called "DWDM SFP MSA
(Multi-source Agreement), Revision 1.0, 19th September 2005". I don't
have access to that ocument (yet). Its likely source, the
http://www.dwdmsfpmsa.org/ has been down for years.

>From the datasheets that I was able to find on random vendors' web, the
second byte can vary -- 0x27 is used, too.

Tested on Clearfog Base with v4.14 and Russell King's SFP patches.

Signed-off-by: Jan Kundrát <jan.kundrat@...net.cz>
---
 drivers/net/phy/sfp.c | 8 ++++++--
 include/linux/sfp.h   | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index e381811e5f11..c937ef40b72c 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -463,8 +463,12 @@ static int sfp_sm_mod_probe(struct sfp *sfp)
 		 vendor, part, rev, sn, date);
 
 	/* We only support SFP modules, not the legacy GBIC modules. */
-	if (sfp->id.base.phys_id != SFP_PHYS_ID_SFP ||
-	    sfp->id.base.phys_ext_id != SFP_PHYS_EXT_ID_SFP) {
+	if (sfp->id.base.phys_id == SFP_PHYS_ID_SFP &&
+	    sfp->id.base.phys_ext_id == SFP_PHYS_EXT_ID_SFP) {
+		/* a regular SFP module */
+	} else if (sfp->id.base.phys_id == SFP_PHYS_ID_DWDM_SFP) {
+		/* DWDM SFP or a DWDM SFP+ -- let's treat it as a regular SFP */
+	} else {
 		dev_err(sfp->dev, "module is not SFP - phys id 0x%02x 0x%02x\n",
 			sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
 		return -EINVAL;
diff --git a/include/linux/sfp.h b/include/linux/sfp.h
index 4a906f560817..21f53adc4434 100644
--- a/include/linux/sfp.h
+++ b/include/linux/sfp.h
@@ -223,6 +223,7 @@ enum {
 	SFP_CC_EXT			= 0x5f,
 
 	SFP_PHYS_ID_SFP			= 0x03,
+	SFP_PHYS_ID_DWDM_SFP		= 0x0b,
 	SFP_PHYS_EXT_ID_SFP		= 0x04,
 	SFP_CONNECTOR_UNSPEC		= 0x00,
 	/* codes 01-05 not supportable on SFP, but some modules have single SC */
-- 
2.14.3