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Date:   Thu, 3 Sep 2020 08:01:28 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Shannon Nelson <snelson@...sando.io>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH net-next 2/2] ionic: add devlink firmware update

Wed, Sep 02, 2020 at 09:57:17PM CEST, snelson@...sando.io wrote:
>Add support for firmware update through the devlink interface.
>This update copies the firmware object into the device, asks
>the current firmware to install it, then asks the firmware to
>set the device to use the new firmware on the next boot-up.
>
>The install and activate steps are launched as asynchronous
>requests, which are then followed up with status requests
>commands.  These status request commands will be answered with
>an EAGAIN return value and will try again until the request
>has completed or reached the timeout specified.
>
>Signed-off-by: Shannon Nelson <snelson@...sando.io>
>---
> drivers/net/ethernet/pensando/ionic/Makefile  |   2 +-
> .../ethernet/pensando/ionic/ionic_devlink.c   |  14 ++
> .../ethernet/pensando/ionic/ionic_devlink.h   |   3 +
> .../net/ethernet/pensando/ionic/ionic_fw.c    | 195 ++++++++++++++++++
> .../net/ethernet/pensando/ionic/ionic_main.c  |  13 +-
> 5 files changed, 222 insertions(+), 5 deletions(-)
> create mode 100644 drivers/net/ethernet/pensando/ionic/ionic_fw.c
>
>diff --git a/drivers/net/ethernet/pensando/ionic/Makefile b/drivers/net/ethernet/pensando/ionic/Makefile
>index 29f304d75261..8d3c2d3cb10d 100644
>--- a/drivers/net/ethernet/pensando/ionic/Makefile
>+++ b/drivers/net/ethernet/pensando/ionic/Makefile
>@@ -5,4 +5,4 @@ obj-$(CONFIG_IONIC) := ionic.o
> 
> ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
> 	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o \
>-	   ionic_txrx.o ionic_stats.o
>+	   ionic_txrx.o ionic_stats.o ionic_fw.o
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>index 8d9fb2e19cca..5348f05ebc32 100644
>--- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>@@ -9,6 +9,19 @@
> #include "ionic_lif.h"
> #include "ionic_devlink.h"
> 
>+static int ionic_dl_flash_update(struct devlink *dl,
>+				 const char *fwname,
>+				 const char *component,
>+				 struct netlink_ext_ack *extack)
>+{
>+	struct ionic *ionic = devlink_priv(dl);
>+
>+	if (component)
>+		return -EOPNOTSUPP;
>+
>+	return ionic_firmware_update(ionic->lif, fwname, extack);
>+}
>+
> static int ionic_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
> 			     struct netlink_ext_ack *extack)
> {
>@@ -48,6 +61,7 @@ static int ionic_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
> 
> static const struct devlink_ops ionic_dl_ops = {
> 	.info_get	= ionic_dl_info_get,
>+	.flash_update	= ionic_dl_flash_update,
> };
> 
> struct ionic *ionic_devlink_alloc(struct device *dev)
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.h b/drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>index 0690172fc57a..5c01a9e306d8 100644
>--- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>@@ -6,6 +6,9 @@
> 
> #include <net/devlink.h>
> 
>+int ionic_firmware_update(struct ionic_lif *lif, const char *fw_name,
>+			  struct netlink_ext_ack *extack);
>+
> struct ionic *ionic_devlink_alloc(struct device *dev);
> void ionic_devlink_free(struct ionic *ionic);
> int ionic_devlink_register(struct ionic *ionic);
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_fw.c b/drivers/net/ethernet/pensando/ionic/ionic_fw.c
>new file mode 100644
>index 000000000000..4dc05e8bdff6
>--- /dev/null
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_fw.c
>@@ -0,0 +1,195 @@
>+// SPDX-License-Identifier: GPL-2.0
>+/* Copyright(c) 2020 Pensando Systems, Inc */
>+
>+#include <linux/kernel.h>
>+#include <linux/types.h>
>+#include <linux/errno.h>
>+#include <linux/firmware.h>
>+
>+#include "ionic.h"
>+#include "ionic_dev.h"
>+#include "ionic_lif.h"
>+#include "ionic_devlink.h"
>+
>+/* The worst case wait for the install activity is about 25 minutes when
>+ * installing a new CPLD, which is very seldom.  Normal is about 30-35
>+ * seconds.  Since the driver can't tell if a CPLD update will happen we
>+ * set the timeout for the ugly case.
>+ */
>+#define IONIC_FW_INSTALL_TIMEOUT	(25 * 60)
>+#define IONIC_FW_ACTIVATE_TIMEOUT	30
>+
>+/* Number of periodic log updates during fw file download */
>+#define IONIC_FW_INTERVAL_FRACTION	32
>+
>+static void ionic_dev_cmd_firmware_download(struct ionic_dev *idev, u64 addr,
>+					    u32 offset, u32 length)
>+{
>+	union ionic_dev_cmd cmd = {
>+		.fw_download.opcode = IONIC_CMD_FW_DOWNLOAD,
>+		.fw_download.offset = offset,
>+		.fw_download.addr = addr,
>+		.fw_download.length = length
>+	};
>+
>+	ionic_dev_cmd_go(idev, &cmd);
>+}
>+
>+static void ionic_dev_cmd_firmware_install(struct ionic_dev *idev)
>+{
>+	union ionic_dev_cmd cmd = {
>+		.fw_control.opcode = IONIC_CMD_FW_CONTROL,
>+		.fw_control.oper = IONIC_FW_INSTALL_ASYNC
>+	};
>+
>+	ionic_dev_cmd_go(idev, &cmd);
>+}
>+
>+static void ionic_dev_cmd_firmware_install_status(struct ionic_dev *idev)
>+{
>+	union ionic_dev_cmd cmd = {
>+		.fw_control.opcode = IONIC_CMD_FW_CONTROL,
>+		.fw_control.oper = IONIC_FW_INSTALL_STATUS
>+	};
>+
>+	ionic_dev_cmd_go(idev, &cmd);
>+}
>+
>+static void ionic_dev_cmd_firmware_activate(struct ionic_dev *idev, u8 slot)
>+{
>+	union ionic_dev_cmd cmd = {
>+		.fw_control.opcode = IONIC_CMD_FW_CONTROL,
>+		.fw_control.oper = IONIC_FW_ACTIVATE_ASYNC,
>+		.fw_control.slot = slot
>+	};
>+
>+	ionic_dev_cmd_go(idev, &cmd);
>+}
>+
>+static void ionic_dev_cmd_firmware_activate_status(struct ionic_dev *idev)
>+{
>+	union ionic_dev_cmd cmd = {
>+		.fw_control.opcode = IONIC_CMD_FW_CONTROL,
>+		.fw_control.oper = IONIC_FW_ACTIVATE_STATUS,
>+	};
>+
>+	ionic_dev_cmd_go(idev, &cmd);
>+}
>+
>+int ionic_firmware_update(struct ionic_lif *lif, const char *fw_name,
>+			  struct netlink_ext_ack *extack)
>+{
>+	struct ionic_dev *idev = &lif->ionic->idev;
>+	struct net_device *netdev = lif->netdev;
>+	struct ionic *ionic = lif->ionic;
>+	union ionic_dev_cmd_comp comp;
>+	u32 buf_sz, copy_sz, offset;
>+	const struct firmware *fw;
>+	struct devlink *dl;
>+	int next_interval;
>+	int err = 0;
>+	u8 fw_slot;
>+
>+	netdev_info(netdev, "Installing firmware %s\n", fw_name);

You don't need this dmesg messagel.


>+
>+	dl = priv_to_devlink(ionic);
>+	devlink_flash_update_begin_notify(dl);
>+	devlink_flash_update_status_notify(dl, "Preparing to flash", NULL, 0, 0);
>+
>+	err = request_firmware(&fw, fw_name, ionic->dev);
>+	if (err) {
>+		NL_SET_ERR_MSG_MOD(extack, "Unable to find firmware file");
>+		goto err_out;
>+	}
>+
>+	buf_sz = sizeof(idev->dev_cmd_regs->data);
>+
>+	netdev_dbg(netdev,
>+		   "downloading firmware - size %d part_sz %d nparts %lu\n",
>+		   (int)fw->size, buf_sz, DIV_ROUND_UP(fw->size, buf_sz));
>+
>+	devlink_flash_update_status_notify(dl, "Downloading", NULL, 0, fw->size);
>+	offset = 0;
>+	next_interval = fw->size / IONIC_FW_INTERVAL_FRACTION;
>+	while (offset < fw->size) {
>+		copy_sz = min_t(unsigned int, buf_sz, fw->size - offset);
>+		mutex_lock(&ionic->dev_cmd_lock);
>+		memcpy_toio(&idev->dev_cmd_regs->data, fw->data + offset, copy_sz);
>+		ionic_dev_cmd_firmware_download(idev,
>+						offsetof(union ionic_dev_cmd_regs, data),
>+						offset, copy_sz);
>+		err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
>+		mutex_unlock(&ionic->dev_cmd_lock);
>+		if (err) {
>+			netdev_err(netdev,
>+				   "download failed offset 0x%x addr 0x%lx len 0x%x\n",
>+				   offset, offsetof(union ionic_dev_cmd_regs, data),
>+				   copy_sz);

And this one.


>+			NL_SET_ERR_MSG_MOD(extack, "Segment download failed");
>+			goto err_out;
>+		}
>+		offset += copy_sz;
>+
>+		if (offset > next_interval) {
>+			devlink_flash_update_status_notify(dl, "Downloading",
>+							   NULL, offset, fw->size);
>+			next_interval = offset + (fw->size / IONIC_FW_INTERVAL_FRACTION);
>+		}
>+	}
>+	devlink_flash_update_status_notify(dl, "Downloading", NULL, 1, 1);
>+
>+	devlink_flash_update_status_notify(dl, "Installing", NULL, 0, 2);
>+
>+	mutex_lock(&ionic->dev_cmd_lock);
>+	ionic_dev_cmd_firmware_install(idev);
>+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
>+	ionic_dev_cmd_comp(idev, (union ionic_dev_cmd_comp *)&comp);
>+	fw_slot = comp.fw_control.slot;
>+	mutex_unlock(&ionic->dev_cmd_lock);
>+	if (err) {
>+		NL_SET_ERR_MSG_MOD(extack, "Failed to start firmware install");
>+		goto err_out;
>+	}
>+
>+	devlink_flash_update_status_notify(dl, "Installing", NULL, 1, 2);
>+	mutex_lock(&ionic->dev_cmd_lock);
>+	ionic_dev_cmd_firmware_install_status(idev);
>+	err = ionic_dev_cmd_wait(ionic, IONIC_FW_INSTALL_TIMEOUT);
>+	mutex_unlock(&ionic->dev_cmd_lock);
>+	if (err) {
>+		NL_SET_ERR_MSG_MOD(extack, "Firmware install failed");
>+		goto err_out;
>+	}
>+	devlink_flash_update_status_notify(dl, "Installing", NULL, 2, 2);
>+
>+	devlink_flash_update_status_notify(dl, "Activating", NULL, 0, 2);
>+
>+	mutex_lock(&ionic->dev_cmd_lock);
>+	ionic_dev_cmd_firmware_activate(idev, fw_slot);
>+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
>+	mutex_unlock(&ionic->dev_cmd_lock);
>+	if (err) {
>+		NL_SET_ERR_MSG_MOD(extack, "Failed to start firmware activation");
>+		goto err_out;
>+	}
>+
>+	devlink_flash_update_status_notify(dl, "Activating", NULL, 1, 2);
>+	mutex_lock(&ionic->dev_cmd_lock);
>+	ionic_dev_cmd_firmware_activate_status(idev);
>+	err = ionic_dev_cmd_wait(ionic, IONIC_FW_ACTIVATE_TIMEOUT);
>+	mutex_unlock(&ionic->dev_cmd_lock);
>+	if (err) {
>+		NL_SET_ERR_MSG_MOD(extack, "Firmware activation failed");
>+		goto err_out;
>+	}
>+	devlink_flash_update_status_notify(dl, "Activating", NULL, 2, 2);
>+
>+	netdev_info(netdev, "Firmware update completed\n");

And this one.


>+
>+err_out:
>+	if (err)
>+		devlink_flash_update_status_notify(dl, "Flash failed", NULL, 0, 0);
>+	release_firmware(fw);
>+	devlink_flash_update_end_notify(dl);
>+	return err;
>+}
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
>index f1fd9a98ae4a..4b4ff885ebf8 100644
>--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
>@@ -361,17 +361,22 @@ int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_seconds)
> 	 */
> 	max_wait = jiffies + (max_seconds * HZ);
> try_again:
>+	opcode = idev->dev_cmd_regs->cmd.cmd.opcode;
> 	start_time = jiffies;
> 	do {
> 		done = ionic_dev_cmd_done(idev);
> 		if (done)
> 			break;
>-		msleep(5);
>-		hb = ionic_heartbeat_check(ionic);
>+		usleep_range(100, 200);
>+
>+		/* Don't check the heartbeat on FW_CONTROL commands as they are
>+		 * notorious for interrupting the firmware's heartbeat update.
>+		 */
>+		if (opcode != IONIC_CMD_FW_CONTROL)
>+			hb = ionic_heartbeat_check(ionic);
> 	} while (!done && !hb && time_before(jiffies, max_wait));
> 	duration = jiffies - start_time;
> 
>-	opcode = idev->dev_cmd_regs->cmd.cmd.opcode;
> 	dev_dbg(ionic->dev, "DEVCMD %s (%d) done=%d took %ld secs (%ld jiffies)\n",
> 		ionic_opcode_to_str(opcode), opcode,
> 		done, duration / HZ, duration);
>@@ -396,7 +401,7 @@ int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_seconds)
> 	err = ionic_dev_cmd_status(&ionic->idev);
> 	if (err) {
> 		if (err == IONIC_RC_EAGAIN && !time_after(jiffies, max_wait)) {
>-			dev_err(ionic->dev, "DEV_CMD %s (%d) error, %s (%d) retrying...\n",
>+			dev_dbg(ionic->dev, "DEV_CMD %s (%d), %s (%d) retrying...\n",
> 				ionic_opcode_to_str(opcode), opcode,
> 				ionic_error_to_str(err), err);
> 
>-- 
>2.17.1
>

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