netdev - Re: 2.6.28-git8: tg3 doesn't work due to firmware not loading (-git7 is ok)

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Date:	Sun, 11 Jan 2009 12:59:59 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	Valdis.Kletnieks@...edu, alessandro.suardi@...il.com,
	jaswinderlinux@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.28-git8: tg3 doesn't work due to firmware not loading
 (-git7 is ok)

On Sun, 2009-01-11 at 12:25 +0000, David Woodhouse wrote:
> I'll take a look and see if I can remedy that. Then we wouldn't _need_
> the FIRMWARE_IN_KERNEL option.

How about this? If it fails to load the firmware from userspace during
the initialisation, it'll try again later in tg3_open(). 

I _think_ that's fine, because we don't do anything else in the early
initialisation which requires the firmware to be loaded.

So if you build with CONFIG_TIGON3=y, CONFIG_FIRMWARE_IN_KERNEL=n, you
should see it fail to load the firmware at boot, but then it should load
it successfully when you bring the device up.

Untested-but-otherwise-Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 5e2dbae..f99218c 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7535,11 +7535,45 @@ static int tg3_test_msi(struct tg3 *tp)
 	return err;
 }
 
+static int tg3_request_firmware(struct tg3 *tp)
+{
+	const __be32 *fw_data;
+
+	if (request_firmware(&tp->fw, tp->fw_needed, &tp->pdev->dev)) {
+		printk(KERN_ERR "tg3: Failed to load firmware \"%s\"\n",
+		       tp->fw_needed);
+		return -ENOENT;
+	}
+
+	fw_data = (void *)tp->fw->data;
+
+	/* Firmware blob starts with version numbers, followed by
+	   start address and _full_ length including BSS sections
+	   (which must be longer than the actual data, of course */
+
+	tp->fw_len = be32_to_cpu(fw_data[2]);	/* includes bss */
+	if (tp->fw_len < (tp->fw->size - 12)) {
+		printk(KERN_ERR "tg3: bogus length %d in \"%s\"\n",
+		       tp->fw_len, tp->fw_needed);
+		return -EINVAL;
+	}
+
+	/* We no longer need firmware; we have it. */
+	tp->fw_needed = NULL;
+	return 0;
+}
+
 static int tg3_open(struct net_device *dev)
 {
 	struct tg3 *tp = netdev_priv(dev);
 	int err;
 
+	if (tp->fw_needed) {
+		err = tg3_request_firmware(tp);
+		if (err)
+			return err;
+	}
+
 	netif_carrier_off(tp->dev);
 
 	err = tg3_set_power_state(tp, PCI_D0);
@@ -12934,7 +12968,6 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 	struct net_device *dev;
 	struct tg3 *tp;
 	int err, pm_cap;
-	const char *fw_name = NULL;
 	char str[40];
 	u64 dma_mask, persist_dma_mask;
 
@@ -13091,7 +13124,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 	tg3_init_bufmgr_config(tp);
 
 	if (tp->pci_chip_rev_id == CHIPREV_ID_5701_A0)
-		fw_name = FIRMWARE_TG3;
+		tp->fw_needed = FIRMWARE_TG3;
 
 	if (tp->tg3_flags2 & TG3_FLG2_HW_TSO) {
 		tp->tg3_flags2 |= TG3_FLG2_TSO_CAPABLE;
@@ -13107,34 +13140,19 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 	}
 	if (tp->tg3_flags2 & TG3_FLG2_TSO_CAPABLE) {
 		if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5705)
-			fw_name = FIRMWARE_TG3TSO5;
+			tp->fw_needed = FIRMWARE_TG3TSO5;
 		else
-			fw_name = FIRMWARE_TG3TSO;
+			tp->fw_needed = FIRMWARE_TG3TSO;
 	}
 
-	if (fw_name) {
-		const __be32 *fw_data;
-
-		err = request_firmware(&tp->fw, fw_name, &tp->pdev->dev);
-		if (err) {
-			printk(KERN_ERR "tg3: Failed to load firmware \"%s\"\n",
-			       fw_name);
-			goto err_out_iounmap;
-		}
-
-		fw_data = (void *)tp->fw->data;
-
-		/* Firmware blob starts with version numbers, followed by
-		   start address and _full_ length including BSS sections
-		   (which must be longer than the actual data, of course */
-
-		tp->fw_len = be32_to_cpu(fw_data[2]);	/* includes bss */
-		if (tp->fw_len < (tp->fw->size - 12)) {
-			printk(KERN_ERR "tg3: bogus length %d in \"%s\"\n",
-			       tp->fw_len, fw_name);
-			err = -EINVAL;
+	if (tp->fw_needed) {
+		err = tg3_request_firmware(tp);
+		/* Failure to load firmware at this stage is not fatal; we'll
+		   try again in tg3_open(). So if you have the driver built
+		   into the kernel, you can still get the firmware loaded
+		   after userspace is running, when the device comes up. */
+		if (err != -ENOENT)
 			goto err_out_fw;
-		}
 	}
 
 	/* TSO is on by default on chips that support hardware TSO.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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