netdev - [PATCH net v3] be2net: Warn users of possible broken functionality on BE2 cards with very old FW versions with latest driver

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Message-ID: <c04a1288-7c23-499a-ae32-d4334fd39065@CMEXHTCAS1.ad.emulex.com>
Date:	Wed, 23 Oct 2013 13:49:16 +0530
From:	Somnath Kotur <somnath.kotur@...lex.com>
To:	<netdev@...r.kernel.org>
CC:	<davem@...emloft.net>, Somnath Kotur <somnath.kotur@...lex.com>
Subject: [PATCH net v3] be2net: Warn users of possible broken functionality on BE2 cards with very old FW versions with latest driver

On very old FW versions < 4.0, the mailbox command to set interrupts
on the card succeeds even though it is not supported and should have
failed, leading to a scenario where interrupts do not work.
Hence warn users to upgrade to a suitable FW version to avoid seeing
broken functionality.

Signed-off-by: Somnath Kotur <somnath.kotur@...lex.com>
---
v3: Incorporated comments from Ben Hutchings and Joe Perches

 drivers/net/ethernet/emulex/benet/be.h      |   14 ++++++++++++++
 drivers/net/ethernet/emulex/benet/be_main.c |    6 ++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index db02023..6a57051 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -696,6 +696,20 @@ static inline int qnq_async_evt_rcvd(struct be_adapter *adapter)
 	return adapter->flags & BE_FLAGS_QNQ_ASYNC_EVT_RCVD;
 }
 
+static inline u32 fw_major_num(char *fw_ver_str)
+{
+	u32 fw_major;
+	char *next, *cp;
+	char tmp_fw_ver[FW_VER_LEN];
+
+	strncpy(tmp_fw_ver, fw_ver_str, strlen(fw_ver_str));
+	next = tmp_fw_ver;
+	cp = strsep(&next, ".");
+	sscanf(cp, "%i", &fw_major);
+
+	return fw_major;
+}
+
 extern void be_cq_notify(struct be_adapter *adapter, u16 qid, bool arm,
 		u16 num_popped);
 extern void be_link_status_update(struct be_adapter *adapter, u8 link_status);
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 2c38cc4..d8da961 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -3247,6 +3247,12 @@ static int be_setup(struct be_adapter *adapter)
 
 	be_cmd_get_fw_ver(adapter, adapter->fw_ver, adapter->fw_on_flash);
 
+	if (BE2_chip(adapter) && fw_major_num(adapter->fw_ver) < 4) {
+		dev_err(dev, "Firmware on card is old(%s), IRQs may not work.",
+			adapter->fw_ver);
+		dev_err(dev, "Please upgrade firmware to version >= 4.0\n");
+	}
+
 	if (adapter->vlans_added)
 		be_vid_config(adapter);
 
-- 
1.6.0.2

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