* [PATCH net-next v3 3/4] net: dsa: mxl862xx: add devlink flash_update and info_get
2026-07-20 3:14 [PATCH net-next v3 0/4] net: dsa: mxl862xx: support firmware update Daniel Golle
2026-07-20 3:14 ` [PATCH net-next v3 1/4] net: dsa: wire flash_update devlink callback to drivers Daniel Golle
2026-07-20 3:14 ` [PATCH net-next v3 2/4] net: dsa: mxl862xx: add SMDIO clause-22 register access Daniel Golle
@ 2026-07-20 3:15 ` Daniel Golle
2026-07-20 3:15 ` [PATCH net-next v3 4/4] net: dsa: mxl862xx: recover switch stuck in MCUboot rescue mode Daniel Golle
3 siblings, 0 replies; 5+ messages in thread
From: Daniel Golle @ 2026-07-20 3:15 UTC (permalink / raw)
To: Daniel Golle, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Simon Horman,
linux-kernel, netdev
Implement runtime firmware upgrade via "devlink dev flash" and version
reporting via "devlink dev info":
devlink dev info mdio_bus/<bus>/<addr>
devlink dev flash mdio_bus/<bus>/<addr> file <firmware.bin>
The "asic.id" fixed version reports a per-model chip name taken from
the OF match data, e.g. "MaxLinear MxL86252", following the mv88e6xxx
example. Userspace such as fwupd builds firmware matching identifiers
from this value.
The firmware image is validated first, including both payload CRCs,
so a malformed file is rejected without disturbing the running
switch. The driver then sends SYS_MISC_FW_UPDATE to enter MCUboot
rescue mode and transfers the signed image over the SB PDI
bulk-transfer protocol (clause-22 SMDIO). Once the transfer has
finished and the switch has rebooted, the driver schedules
device_reprobe() for a clean remove()+probe() cycle.
Before the transfer begins the driver closes all user and conduit
interfaces and additionally marks the user ports not-present via
netif_device_detach() so that userspace cannot bring them back up
during the flash and reprobe cycle, which takes just under a minute.
The conduit belongs to the MAC driver and is only closed. Closing
the ports also stops phylib from polling the switch-internal PHYs,
whose firmware-relayed MDIO access is unavailable while the switch
is in MCUboot mode. Progress is reported through devlink status
notifications.
While the update runs, firmware API commands from any other path are
rejected. The blocking flags are checked under the MDIO bus lock so
that a command which had already passed the check cannot reach the
bus once the switch has rebooted into MCUboot. The periodic stats
poll and the CRC error handler are stopped before the transfer
starts.
Once the FW_UPDATE command has been sent the switch is in MCUboot
mode and normal operation can only be restored by a reprobe, so the
reprobe work item and the module and device references it holds are
set up before the switch is disturbed and the work is scheduled
regardless of transfer outcome.
The reprobe work item is dynamically allocated because
device_reprobe() triggers remove() which frees the devm-managed priv
while the work item is still executing, so the work struct cannot be
a member of priv. iwlwifi uses the same approach for its
firmware-triggered device removal, see iwl_trans_pcie_removal_wk().
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
v3:
- validate the image, including both CRCs, before closing any ports
so a malformed file no longer triggers a flash and reprobe cycle
- reject images whose declared payload sizes overflow when summed
(check_add_overflow) or sum up to zero; the latter used to erase
the flash without writing anything back
- allocate the reprobe work item and take the module and device
references before disturbing the switch instead of silently
skipping the reprobe when the allocation fails afterwards
- check block_host/skip_teardown under the MDIO bus lock to close
the window where a command already past the check could reach the
bus after the switch rebooted into MCUboot
- prevent the stats poll work from being re-armed and cancel the
CRC error work before the transfer
- check the return value of SB PDI data word writes; control writes
are verified by the subsequent status polls
- report a per-model chip name from the OF match data as "asic.id"
instead of the devicetree compatible string whose comma is
awkward for userspace consumers (Andrew Lunn)
- commit message: the conduit is only closed, not detached
v2:
- factor out SB PDI slice flush and devlink status notification
helpers, resolving checkpatch issues
- use kzalloc_obj() (Manuel Ebner)
- add kernel-doc for the new mxl862xx_priv members
- trim comments and state the actual duration of a flash and reprobe
cycle, just under a minute (Manuel Ebner)
- reword commit message: split up run-on sentence, explain the
dynamically allocated reprobe work item (Manuel Ebner), mention
that closing the ports stops phylib polling (Andrew Lunn)
drivers/net/dsa/mxl862xx/Makefile | 2 +-
drivers/net/dsa/mxl862xx/mxl862xx-cmd.h | 1 +
drivers/net/dsa/mxl862xx/mxl862xx-fw.c | 453 +++++++++++++++++++++++
drivers/net/dsa/mxl862xx/mxl862xx-fw.h | 15 +
drivers/net/dsa/mxl862xx/mxl862xx-host.c | 11 +
drivers/net/dsa/mxl862xx/mxl862xx.c | 7 +-
drivers/net/dsa/mxl862xx/mxl862xx.h | 6 +
7 files changed, 492 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/dsa/mxl862xx/mxl862xx-fw.c
create mode 100644 drivers/net/dsa/mxl862xx/mxl862xx-fw.h
diff --git a/drivers/net/dsa/mxl862xx/Makefile b/drivers/net/dsa/mxl862xx/Makefile
index a7be0e6669df..bccac0d0f703 100644
--- a/drivers/net/dsa/mxl862xx/Makefile
+++ b/drivers/net/dsa/mxl862xx/Makefile
@@ -1,3 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_NET_DSA_MXL862) += mxl862xx_dsa.o
-mxl862xx_dsa-y := mxl862xx.o mxl862xx-host.o mxl862xx-phylink.o
+mxl862xx_dsa-y := mxl862xx.o mxl862xx-host.o mxl862xx-phylink.o mxl862xx-fw.o
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-cmd.h b/drivers/net/dsa/mxl862xx/mxl862xx-cmd.h
index c87a955c13c4..e2aa2934e9e1 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-cmd.h
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-cmd.h
@@ -70,6 +70,7 @@
#define INT_GPHY_READ (GPY_GPY2XX_MAGIC + 0x1)
#define INT_GPHY_WRITE (GPY_GPY2XX_MAGIC + 0x2)
+#define SYS_MISC_FW_UPDATE (SYS_MISC_MAGIC + 0x1)
#define SYS_MISC_FW_VERSION (SYS_MISC_MAGIC + 0x2)
#define MXL862XX_XPCS_PCS_CONFIG (MXL862XX_XPCS_MAGIC + 0x1)
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-fw.c b/drivers/net/dsa/mxl862xx/mxl862xx-fw.c
new file mode 100644
index 000000000000..65c65d96518d
--- /dev/null
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-fw.c
@@ -0,0 +1,453 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Firmware flash and devlink support for MaxLinear MxL862xx
+ *
+ * Copyright (C) 2025 Daniel Golle <daniel@makrotopia.org>
+ */
+
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/overflow.h>
+#include <linux/property.h>
+#include <linux/rtnetlink.h>
+#include <net/dsa.h>
+
+#include "mxl862xx.h"
+#include "mxl862xx-api.h"
+#include "mxl862xx-cmd.h"
+#include "mxl862xx-fw.h"
+#include "mxl862xx-host.h"
+
+/* SB PDI registers (clause-22 SMDIO address space) */
+#define MXL862XX_SB_PDI_CTRL 0xe100
+#define MXL862XX_SB_PDI_ADDR 0xe101
+#define MXL862XX_SB_PDI_DATA 0xe102
+#define MXL862XX_SB_PDI_STAT 0xe103
+
+/* SB PDI CTRL modes */
+#define MXL862XX_SB_PDI_CTRL_RST 0x00
+#define MXL862XX_SB_PDI_CTRL_WR 0x02
+
+/* SB PDI handshake magic */
+#define MXL862XX_SB_PDI_READY 0xc55c
+#define MXL862XX_SB_PDI_START 0xf48f
+#define MXL862XX_SB_PDI_END 0x3cc3
+
+/* Firmware transfer geometry */
+#define MXL862XX_FW_HDR_SIZE 20
+#define MXL862XX_FW_BANK_HALF 16384 /* words per half-bank */
+#define MXL862XX_FW_BANK_SLICE 32760 /* words per full slice */
+#define MXL862XX_FW_SB1_ADDR 0x7800 /* SB1 word address */
+
+/* Timeouts (generous upper bounds) */
+#define MXL862XX_FW_READY_TIMEOUT_MS 30000
+#define MXL862XX_FW_ACK_TIMEOUT_MS 5000
+#define MXL862XX_FW_ERASE_TIMEOUT_MS 300000
+#define MXL862XX_FW_WRITE_TIMEOUT_MS 120000
+#define MXL862XX_FW_REBOOT_DELAY_MS 5000
+
+static void mxl862xx_sb_pdi_reset(struct mxl862xx_priv *priv)
+{
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_RST);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_ADDR,
+ MXL862XX_SB_PDI_CTRL_RST);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_DATA,
+ MXL862XX_SB_PDI_CTRL_RST);
+}
+
+static int mxl862xx_sb_pdi_poll_stat(struct mxl862xx_priv *priv, u16 expected,
+ unsigned long timeout_ms)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
+ int ret;
+
+ do {
+ ret = mxl862xx_smdio_read(priv, MXL862XX_SB_PDI_STAT);
+ if (ret < 0)
+ return ret;
+ if ((u16)ret == expected)
+ return 0;
+ usleep_range(10000, 11000);
+ } while (time_before(jiffies, timeout));
+
+ return -ETIMEDOUT;
+}
+
+static int mxl862xx_sb_pdi_flush_slice(struct mxl862xx_priv *priv,
+ u32 data_written)
+{
+ mxl862xx_sb_pdi_reset(priv);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_STAT, data_written);
+
+ return mxl862xx_sb_pdi_poll_stat(priv, 0,
+ MXL862XX_FW_WRITE_TIMEOUT_MS);
+}
+
+static void mxl862xx_flash_notify(struct devlink *dl, const char *status,
+ u32 done, u32 total)
+{
+ devlink_flash_update_status_notify(dl, status, NULL, done, total);
+}
+
+/* device_reprobe() -> remove() frees priv while the work runs, so
+ * the work struct cannot live in mxl862xx_priv.
+ */
+struct mxl862xx_reprobe {
+ struct device *dev;
+ struct delayed_work dwork;
+};
+
+static void mxl862xx_reprobe_work_fn(struct work_struct *work)
+{
+ struct mxl862xx_reprobe *reprobe =
+ container_of(work, struct mxl862xx_reprobe, dwork.work);
+
+ if (device_reprobe(reprobe->dev))
+ dev_err(reprobe->dev, "reprobe failed\n");
+ put_device(reprobe->dev);
+ kfree(reprobe);
+ module_put(THIS_MODULE);
+}
+
+/* MCUboot firmware image header */
+struct mxl862xx_fw_hdr {
+ __le32 image_type;
+ __le32 image_size_1;
+ __le32 image_checksum_1;
+ __le32 image_size_2;
+ __le32 image_checksum_2;
+} __packed;
+
+static int mxl862xx_flash_validate(struct mxl862xx_priv *priv,
+ const struct firmware *fw,
+ u32 *payload_size)
+{
+ const struct mxl862xx_fw_hdr *hdr;
+ u32 size1, size2, total;
+ const u8 *payload;
+ u32 crc;
+
+ if (fw->size < MXL862XX_FW_HDR_SIZE)
+ return -EINVAL;
+
+ hdr = (const struct mxl862xx_fw_hdr *)fw->data;
+ payload = fw->data + MXL862XX_FW_HDR_SIZE;
+ size1 = le32_to_cpu(hdr->image_size_1);
+ size2 = le32_to_cpu(hdr->image_size_2);
+
+ if (check_add_overflow(size1, size2, &total) ||
+ total > fw->size - MXL862XX_FW_HDR_SIZE) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: firmware file too small for declared size\n");
+ return -EINVAL;
+ }
+
+ if (!total) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: firmware file with empty payload\n");
+ return -EINVAL;
+ }
+
+ if (size1) {
+ crc = ~crc32_le(~0U, payload, size1);
+ if (crc != le32_to_cpu(hdr->image_checksum_1)) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: image 1 CRC mismatch (got %08x, expected %08x)\n",
+ crc, le32_to_cpu(hdr->image_checksum_1));
+ return -EINVAL;
+ }
+ }
+
+ if (size2) {
+ crc = ~crc32_le(~0U, payload + size1, size2);
+ if (crc != le32_to_cpu(hdr->image_checksum_2)) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: image 2 CRC mismatch (got %08x, expected %08x)\n",
+ crc, le32_to_cpu(hdr->image_checksum_2));
+ return -EINVAL;
+ }
+ }
+
+ *payload_size = total;
+
+ return 0;
+}
+
+static int mxl862xx_flash_firmware(struct mxl862xx_priv *priv,
+ const struct firmware *fw,
+ u32 payload_size, struct devlink *dl)
+{
+ const u8 *payload = fw->data + MXL862XX_FW_HDR_SIZE;
+ u32 word_idx = 0, data_written = 0, idx = 0;
+ unsigned long next_notify = 0;
+ u16 word, fdata;
+ int ret, i;
+
+ /* Step 1: reboot the firmware into MCUboot rescue mode */
+ ret = mxl862xx_api_wrap(priv, SYS_MISC_FW_UPDATE, NULL, 0,
+ false, false);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: FW_UPDATE command failed: %pe\n",
+ ERR_PTR(ret));
+ return ret;
+ }
+
+ /* Failures from here on must go through end_magic so MCUboot
+ * reboots instead of waiting forever.
+ */
+
+ /* Step 2: wait for bootloader ready */
+ mxl862xx_flash_notify(dl, "Waiting for bootloader", 0, 0);
+ mxl862xx_sb_pdi_reset(priv);
+ ret = mxl862xx_sb_pdi_poll_stat(priv, MXL862XX_SB_PDI_READY,
+ MXL862XX_FW_READY_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: bootloader not ready: %pe\n", ERR_PTR(ret));
+ goto end_magic;
+ }
+
+ /* Step 3: start handshake */
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_STAT,
+ MXL862XX_SB_PDI_START);
+ ret = mxl862xx_sb_pdi_poll_stat(priv, MXL862XX_SB_PDI_START + 1,
+ MXL862XX_FW_ACK_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: start handshake failed: %pe\n", ERR_PTR(ret));
+ goto end_magic;
+ }
+
+ /* Step 4: transfer image header */
+ mxl862xx_flash_notify(dl, "Erasing flash", 0, 0);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_WR);
+ for (i = 0; i < MXL862XX_FW_HDR_SIZE / 2; i++) {
+ word = fw->data[i * 2] |
+ ((u16)fw->data[i * 2 + 1] << 8);
+ ret = mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_DATA, word);
+ if (ret < 0) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: header write failed: %pe\n",
+ ERR_PTR(ret));
+ goto end_magic;
+ }
+ }
+ mxl862xx_sb_pdi_reset(priv);
+
+ /* the byte count in STAT triggers the erase */
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_STAT,
+ MXL862XX_FW_HDR_SIZE);
+
+ /* ACK is byte count + 1 */
+ ret = mxl862xx_sb_pdi_poll_stat(priv, MXL862XX_FW_HDR_SIZE + 1,
+ MXL862XX_FW_ACK_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: header ACK failed: %pe\n", ERR_PTR(ret));
+ goto end_magic;
+ }
+
+ /* Step 5: wait for erase to complete */
+ ret = mxl862xx_sb_pdi_poll_stat(priv, 0,
+ MXL862XX_FW_ERASE_TIMEOUT_MS);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: erase timeout: %pe\n", ERR_PTR(ret));
+ goto end_magic;
+ }
+
+ /* Step 6: transfer payload */
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_WR);
+
+ while (idx < payload_size) {
+ if (idx + 1 < payload_size) {
+ fdata = payload[idx] |
+ ((u16)payload[idx + 1] << 8);
+ idx += 2;
+ data_written += 2;
+ } else {
+ fdata = payload[idx];
+ idx++;
+ data_written++;
+ }
+
+ ret = mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_DATA, fdata);
+ if (ret < 0) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: data write failed at %u/%u: %pe\n",
+ idx, payload_size, ERR_PTR(ret));
+ goto end_magic;
+ }
+ word_idx++;
+
+ if (idx >= payload_size) {
+ ret = mxl862xx_sb_pdi_flush_slice(priv, data_written);
+ break;
+ }
+
+ /* Half-bank boundary: switch to SB1 address */
+ if (word_idx == MXL862XX_FW_BANK_HALF) {
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_RST);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_ADDR,
+ MXL862XX_FW_SB1_ADDR);
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_WR);
+ } else if (word_idx >= MXL862XX_FW_BANK_SLICE) {
+ ret = mxl862xx_sb_pdi_flush_slice(priv, data_written);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: write timeout at %u/%u: %pe\n",
+ idx, payload_size, ERR_PTR(ret));
+ goto end_magic;
+ }
+ word_idx = 0;
+ data_written = 0;
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_CTRL,
+ MXL862XX_SB_PDI_CTRL_WR);
+
+ if (time_after(jiffies, next_notify)) {
+ mxl862xx_flash_notify(dl, "Flashing", idx,
+ payload_size);
+ next_notify = jiffies + msecs_to_jiffies(500);
+ }
+ }
+ }
+
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: final write timeout: %pe\n", ERR_PTR(ret));
+ goto end_magic;
+ }
+
+ mxl862xx_flash_notify(dl, "Flashing", payload_size, payload_size);
+
+end_magic:
+ /* reboot MCUboot even after a failed transfer */
+ mxl862xx_smdio_write(priv, MXL862XX_SB_PDI_STAT,
+ MXL862XX_SB_PDI_END);
+ msleep(MXL862XX_FW_REBOOT_DELAY_MS);
+
+ return ret;
+}
+
+int mxl862xx_devlink_info_get(struct dsa_switch *ds,
+ struct devlink_info_req *req,
+ struct netlink_ext_ack *extack)
+{
+ struct mxl862xx_priv *priv = ds->priv;
+ const char *model;
+ char ver_str[32];
+ int ret;
+
+ model = device_get_match_data(ds->dev);
+ if (model) {
+ ret = devlink_info_version_fixed_put(req,
+ DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
+ model);
+ if (ret)
+ return ret;
+ }
+
+ snprintf(ver_str, sizeof(ver_str), "%u.%u.%u",
+ priv->fw_version.major, priv->fw_version.minor,
+ priv->fw_version.revision);
+
+ return devlink_info_version_running_put(req, "fw", ver_str);
+}
+
+int mxl862xx_devlink_flash_update(struct dsa_switch *ds,
+ struct devlink_flash_update_params *params,
+ struct netlink_ext_ack *extack)
+{
+ struct mxl862xx_priv *priv = ds->priv;
+ struct mxl862xx_sys_fw_image_version ver = {};
+ struct mxl862xx_reprobe *reprobe;
+ struct dsa_port *dp;
+ u32 payload_size;
+ int ret, i;
+
+ if (params->component) {
+ NL_SET_ERR_MSG_MOD(extack, "component is not supported");
+ return -EOPNOTSUPP;
+ }
+
+ ret = mxl862xx_flash_validate(priv, params->fw, &payload_size);
+ if (ret) {
+ NL_SET_ERR_MSG_MOD(extack, "firmware image validation failed");
+ return ret;
+ }
+
+ /* Everything needed to schedule the reprobe which restores
+ * normal operation must be in place before the switch is
+ * disturbed.
+ */
+ reprobe = kzalloc_obj(*reprobe);
+ if (!reprobe)
+ return -ENOMEM;
+
+ if (!try_module_get(THIS_MODULE)) {
+ kfree(reprobe);
+ return -ENODEV;
+ }
+
+ reprobe->dev = get_device(ds->dev);
+ INIT_DELAYED_WORK(&reprobe->dwork, mxl862xx_reprobe_work_fn);
+
+ dev_info(ds->dev, "flash: running firmware %u.%u.%u\n",
+ priv->fw_version.major, priv->fw_version.minor,
+ priv->fw_version.revision);
+
+ /* Close ports while the firmware is still alive so the DSA
+ * core's MDB/FDB tracking is drained, and detach user ports
+ * so userspace cannot reopen them during the flash. The
+ * conduit belongs to the MAC driver and is only closed.
+ */
+ rtnl_lock();
+ dsa_switch_for_each_user_port(dp, ds) {
+ if (dp->user) {
+ dev_close(dp->user);
+ netif_device_detach(dp->user);
+ }
+ }
+ dsa_switch_for_each_cpu_port(dp, ds)
+ dev_close(dp->conduit);
+ rtnl_unlock();
+
+ priv->block_host = true;
+
+ set_bit(MXL862XX_FLAG_WORK_STOPPED, &priv->flags);
+ cancel_delayed_work_sync(&priv->stats_work);
+ cancel_work_sync(&priv->crc_err_work);
+ for (i = 0; i < ds->num_ports; i++)
+ cancel_work_sync(&priv->ports[i].host_flood_work);
+
+ ret = mxl862xx_flash_firmware(priv, params->fw, payload_size,
+ ds->devlink);
+ if (ret)
+ NL_SET_ERR_MSG_MOD(extack, "firmware transfer failed");
+
+ if (!ret) {
+ /* lift the block to query the new firmware version */
+ priv->block_host = false;
+ memset(&ver, 0, sizeof(ver));
+ if (!MXL862XX_API_READ_QUIET(priv, SYS_MISC_FW_VERSION, ver) &&
+ ver.iv_major)
+ dev_info(ds->dev, "flash: new firmware %u.%u.%u\n",
+ ver.iv_major, ver.iv_minor,
+ le16_to_cpu(ver.iv_revision));
+ }
+
+ priv->skip_teardown = true;
+
+ schedule_delayed_work(&reprobe->dwork, msecs_to_jiffies(500));
+
+ return ret;
+}
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-fw.h b/drivers/net/dsa/mxl862xx/mxl862xx-fw.h
new file mode 100644
index 000000000000..a1b60fbacebf
--- /dev/null
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-fw.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __MXL862XX_FW_H
+#define __MXL862XX_FW_H
+
+#include <net/dsa.h>
+
+int mxl862xx_devlink_info_get(struct dsa_switch *ds,
+ struct devlink_info_req *req,
+ struct netlink_ext_ack *extack);
+int mxl862xx_devlink_flash_update(struct dsa_switch *ds,
+ struct devlink_flash_update_params *params,
+ struct netlink_ext_ack *extack);
+
+#endif /* __MXL862XX_FW_H */
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-host.c b/drivers/net/dsa/mxl862xx/mxl862xx-host.c
index 6e582caea1fa..5ecb19f52658 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-host.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-host.c
@@ -15,6 +15,7 @@
#include <linux/unaligned.h>
#include <net/dsa.h>
#include "mxl862xx.h"
+#include "mxl862xx-cmd.h"
#include "mxl862xx-host.h"
#define CTRL_BUSY_MASK BIT(15)
@@ -340,6 +341,16 @@ int mxl862xx_api_wrap(struct mxl862xx_priv *priv, u16 cmd, void *_data,
mutex_lock_nested(&priv->mdiodev->bus->mdio_lock, MDIO_MUTEX_NESTED);
+ if (priv->skip_teardown) {
+ ret = 0;
+ goto out;
+ }
+
+ if (priv->block_host && cmd != SYS_MISC_FW_UPDATE) {
+ ret = -EBUSY;
+ goto out;
+ }
+
max = (size + 1) / 2;
ret = mxl862xx_busy_wait(priv);
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx.c b/drivers/net/dsa/mxl862xx/mxl862xx.c
index 45d237b3a40f..4f3a9b311b52 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx.c
@@ -21,6 +21,7 @@
#include "mxl862xx.h"
#include "mxl862xx-api.h"
#include "mxl862xx-cmd.h"
+#include "mxl862xx-fw.h"
#include "mxl862xx-host.h"
#include "mxl862xx-phylink.h"
@@ -2086,6 +2087,8 @@ static const struct dsa_switch_ops mxl862xx_switch_ops = {
.get_pause_stats = mxl862xx_get_pause_stats,
.get_rmon_stats = mxl862xx_get_rmon_stats,
.get_stats64 = mxl862xx_get_stats64,
+ .devlink_info_get = mxl862xx_devlink_info_get,
+ .devlink_flash_update = mxl862xx_devlink_flash_update,
};
static int mxl862xx_probe(struct mdio_device *mdiodev)
@@ -2191,8 +2194,8 @@ static void mxl862xx_shutdown(struct mdio_device *mdiodev)
}
static const struct of_device_id mxl862xx_of_match[] = {
- { .compatible = "maxlinear,mxl86282" },
- { .compatible = "maxlinear,mxl86252" },
+ { .compatible = "maxlinear,mxl86282", .data = "MaxLinear MxL86282" },
+ { .compatible = "maxlinear,mxl86252", .data = "MaxLinear MxL86252" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxl862xx_of_match);
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx.h b/drivers/net/dsa/mxl862xx/mxl862xx.h
index 432a5f3f2e08..64d91ad51936 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx.h
+++ b/drivers/net/dsa/mxl862xx/mxl862xx.h
@@ -319,6 +319,10 @@ struct mxl862xx_fw_version {
* @evlan_ingress_size: per-port ingress Extended VLAN block size
* @evlan_egress_size: per-port egress Extended VLAN block size
* @vf_block_size: per-port VLAN Filter block size
+ * @block_host: reject firmware API commands (except FW_UPDATE)
+ * during a firmware flash
+ * @skip_teardown: discard firmware API commands during the teardown
+ * triggered by the post-flash reprobe
* @stats_work: periodic work item that polls RMON hardware counters
* and accumulates them into 64-bit per-port stats
*/
@@ -337,6 +341,8 @@ struct mxl862xx_priv {
u16 evlan_ingress_size;
u16 evlan_egress_size;
u16 vf_block_size;
+ bool block_host;
+ bool skip_teardown;
struct delayed_work stats_work;
};
--
2.55.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH net-next v3 4/4] net: dsa: mxl862xx: recover switch stuck in MCUboot rescue mode
2026-07-20 3:14 [PATCH net-next v3 0/4] net: dsa: mxl862xx: support firmware update Daniel Golle
` (2 preceding siblings ...)
2026-07-20 3:15 ` [PATCH net-next v3 3/4] net: dsa: mxl862xx: add devlink flash_update and info_get Daniel Golle
@ 2026-07-20 3:15 ` Daniel Golle
3 siblings, 0 replies; 5+ messages in thread
From: Daniel Golle @ 2026-07-20 3:15 UTC (permalink / raw)
To: Daniel Golle, Andrew Lunn, Vladimir Oltean, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, Simon Horman,
linux-kernel, netdev
When the application firmware image is broken (e.g. after an
interrupted flash update) or the sticky rescue flag is set, the
switch stays in MCUboot which only exposes the clause-22 SMDIO
interface used for firmware download. The clause-45 MMD API never
becomes ready, probe fails with -ETIMEDOUT and the user is left
without any way to install a working firmware image other than
physical access to the UART console of the switch.
Detect this state during setup by reading the SB PDI STAT register
via SMDIO: MCUboot signals readiness for a firmware download with
the ready magic. Probe this register first to avoid pointlessly
waiting for the MMD API on a switch sitting in rescue mode, and
probe it again after a ready timeout to catch firmware which was
still alive enough to accept the reset command but then fell into
rescue mode due to a broken image on flash.
In rescue mode, complete the switch registration without any user
interfaces so that devlink is available: user ports fail port_setup
with -ENODEV which makes the DSA core re-register them as unused
ports, while shared and unused ports succeed as their setup must not
fail for the tree to register. The CPU port works without firmware
access since it uses a fixed link and the phylink MAC ops do not
touch the hardware; mac_select_pcs returns no PCS in rescue mode.
Firmware API commands fail fast with -ENODEV instead of running
into the MDIO poll timeout, and the port enable/disable and STP
callbacks invoked by the DSA core during registration and teardown
become no-ops.
devlink dev info reports the running firmware version as the
canonical null version "0.0.0" in rescue mode. An operational switch
can never report this version since the major version of any
released firmware is non-zero. Version-comparing update tools like
fwupd thus treat every available release as an upgrade and offer to
install it, so the switch can be recovered through the regular
update flow. devlink flash update skips the FW_UPDATE command in
rescue mode as MCUboot is already waiting for a download, and
proceeds directly with the SB PDI handshake. After a successful
transfer the usual reprobe cycle restores normal operation; after a
failed one rescue mode is detected again and the user can simply
retry.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
v3:
- report the canonical null version "0.0.0" instead of
"mcuboot-rescue" so that version-comparing update tools like
fwupd offer any available release as an upgrade for recovery
- check the rescue_mode flag under the MDIO bus lock, following
the block_host/skip_teardown change in the previous patch
v2: new patch, allowing recovery from a failed or interrupted update
without having to use a special recovery OS image (Andrew Lunn)
drivers/net/dsa/mxl862xx/mxl862xx-fw.c | 49 ++++++++++++++++-----
drivers/net/dsa/mxl862xx/mxl862xx-fw.h | 3 ++
drivers/net/dsa/mxl862xx/mxl862xx-host.c | 5 +++
drivers/net/dsa/mxl862xx/mxl862xx-phylink.c | 2 +
drivers/net/dsa/mxl862xx/mxl862xx.c | 38 ++++++++++++++--
drivers/net/dsa/mxl862xx/mxl862xx.h | 3 ++
6 files changed, 87 insertions(+), 13 deletions(-)
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-fw.c b/drivers/net/dsa/mxl862xx/mxl862xx-fw.c
index 65c65d96518d..6a1de247c2f0 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-fw.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-fw.c
@@ -93,6 +93,24 @@ static void mxl862xx_flash_notify(struct devlink *dl, const char *status,
devlink_flash_update_status_notify(dl, status, NULL, done, total);
}
+/**
+ * mxl862xx_rescue_mode_detect - check whether the switch sits in MCUboot
+ * @priv: driver private data
+ *
+ * MCUboot signals readiness for a firmware download with the SB PDI
+ * ready magic; only the clause-22 SMDIO interface works in this state.
+ *
+ * Return: true if MCUboot is waiting for a firmware download.
+ */
+bool mxl862xx_rescue_mode_detect(struct mxl862xx_priv *priv)
+{
+ int ret;
+
+ ret = mxl862xx_smdio_read(priv, MXL862XX_SB_PDI_STAT);
+
+ return ret == MXL862XX_SB_PDI_READY;
+}
+
/* device_reprobe() -> remove() frees priv while the work runs, so
* the work struct cannot live in mxl862xx_priv.
*/
@@ -188,13 +206,15 @@ static int mxl862xx_flash_firmware(struct mxl862xx_priv *priv,
int ret, i;
/* Step 1: reboot the firmware into MCUboot rescue mode */
- ret = mxl862xx_api_wrap(priv, SYS_MISC_FW_UPDATE, NULL, 0,
- false, false);
- if (ret) {
- dev_err(&priv->mdiodev->dev,
- "flash: FW_UPDATE command failed: %pe\n",
- ERR_PTR(ret));
- return ret;
+ if (!priv->rescue_mode) {
+ ret = mxl862xx_api_wrap(priv, SYS_MISC_FW_UPDATE, NULL, 0,
+ false, false);
+ if (ret) {
+ dev_err(&priv->mdiodev->dev,
+ "flash: FW_UPDATE command failed: %pe\n",
+ ERR_PTR(ret));
+ return ret;
+ }
}
/* Failures from here on must go through end_magic so MCUboot
@@ -356,6 +376,10 @@ int mxl862xx_devlink_info_get(struct dsa_switch *ds,
return ret;
}
+ /* canonical null version: no operational firmware on the switch */
+ if (priv->rescue_mode)
+ return devlink_info_version_running_put(req, "fw", "0.0.0");
+
snprintf(ver_str, sizeof(ver_str), "%u.%u.%u",
priv->fw_version.major, priv->fw_version.minor,
priv->fw_version.revision);
@@ -401,9 +425,13 @@ int mxl862xx_devlink_flash_update(struct dsa_switch *ds,
reprobe->dev = get_device(ds->dev);
INIT_DELAYED_WORK(&reprobe->dwork, mxl862xx_reprobe_work_fn);
- dev_info(ds->dev, "flash: running firmware %u.%u.%u\n",
- priv->fw_version.major, priv->fw_version.minor,
- priv->fw_version.revision);
+ if (priv->rescue_mode)
+ dev_info(ds->dev,
+ "flash: recovering switch from MCUboot rescue mode\n");
+ else
+ dev_info(ds->dev, "flash: running firmware %u.%u.%u\n",
+ priv->fw_version.major, priv->fw_version.minor,
+ priv->fw_version.revision);
/* Close ports while the firmware is still alive so the DSA
* core's MDB/FDB tracking is drained, and detach user ports
@@ -437,6 +465,7 @@ int mxl862xx_devlink_flash_update(struct dsa_switch *ds,
if (!ret) {
/* lift the block to query the new firmware version */
priv->block_host = false;
+ priv->rescue_mode = false;
memset(&ver, 0, sizeof(ver));
if (!MXL862XX_API_READ_QUIET(priv, SYS_MISC_FW_VERSION, ver) &&
ver.iv_major)
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-fw.h b/drivers/net/dsa/mxl862xx/mxl862xx-fw.h
index a1b60fbacebf..57c2000cfee5 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-fw.h
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-fw.h
@@ -5,6 +5,9 @@
#include <net/dsa.h>
+struct mxl862xx_priv;
+
+bool mxl862xx_rescue_mode_detect(struct mxl862xx_priv *priv);
int mxl862xx_devlink_info_get(struct dsa_switch *ds,
struct devlink_info_req *req,
struct netlink_ext_ack *extack);
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-host.c b/drivers/net/dsa/mxl862xx/mxl862xx-host.c
index 5ecb19f52658..80565de710d3 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-host.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-host.c
@@ -346,6 +346,11 @@ int mxl862xx_api_wrap(struct mxl862xx_priv *priv, u16 cmd, void *_data,
goto out;
}
+ if (priv->rescue_mode) {
+ ret = -ENODEV;
+ goto out;
+ }
+
if (priv->block_host && cmd != SYS_MISC_FW_UPDATE) {
ret = -EBUSY;
goto out;
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx-phylink.c b/drivers/net/dsa/mxl862xx/mxl862xx-phylink.c
index b689652aa9b9..a5b6940b552e 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx-phylink.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx-phylink.c
@@ -406,6 +406,8 @@ mxl862xx_phylink_mac_select_pcs(struct phylink_config *config,
switch (port) {
case 9 ... 16:
+ if (priv->rescue_mode)
+ return NULL;
if (!MXL862XX_FW_VER_MIN(priv, 1, 0, 84)) {
dev_warn_once(dp->ds->dev,
"SerDes PCS unsupported on old firmware.\n");
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx.c b/drivers/net/dsa/mxl862xx/mxl862xx.c
index 4f3a9b311b52..265a83f4b371 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx.c
+++ b/drivers/net/dsa/mxl862xx/mxl862xx.c
@@ -629,9 +629,22 @@ static int mxl862xx_setup(struct dsa_switch *ds)
if (ret)
return ret;
- ret = mxl862xx_wait_ready(ds);
- if (ret)
- return ret;
+ priv->rescue_mode = mxl862xx_rescue_mode_detect(priv);
+ if (!priv->rescue_mode) {
+ ret = mxl862xx_wait_ready(ds);
+ if (ret) {
+ /* the reset may only now have triggered rescue mode */
+ priv->rescue_mode = mxl862xx_rescue_mode_detect(priv);
+ if (!priv->rescue_mode)
+ return ret;
+ }
+ }
+
+ if (priv->rescue_mode) {
+ dev_warn(ds->dev,
+ "switch stuck in MCUboot rescue mode, use devlink to flash new firmware\n");
+ return 0;
+ }
mutex_init(&priv->serdes_lock);
for (i = 0; i < ARRAY_SIZE(priv->serdes_ports); i++)
@@ -716,11 +729,21 @@ static int mxl862xx_port_state(struct dsa_switch *ds, int port, bool enable)
static int mxl862xx_port_enable(struct dsa_switch *ds, int port,
struct phy_device *phydev)
{
+ struct mxl862xx_priv *priv = ds->priv;
+
+ if (priv->rescue_mode)
+ return 0;
+
return mxl862xx_port_state(ds, port, true);
}
static void mxl862xx_port_disable(struct dsa_switch *ds, int port)
{
+ struct mxl862xx_priv *priv = ds->priv;
+
+ if (priv->rescue_mode)
+ return;
+
if (mxl862xx_port_state(ds, port, false))
dev_err(ds->dev, "failed to disable port %d\n", port);
}
@@ -1338,6 +1361,12 @@ static int mxl862xx_port_setup(struct dsa_switch *ds, int port)
bool is_cpu_port = dsa_port_is_cpu(dp);
int ret;
+ /* DSA reinits failed user ports as unused; shared ports must
+ * succeed for the tree to register.
+ */
+ if (priv->rescue_mode)
+ return dsa_port_is_user(dp) ? -ENODEV : 0;
+
ret = mxl862xx_port_state(ds, port, false);
if (ret)
return ret;
@@ -1629,6 +1658,9 @@ static void mxl862xx_port_stp_state_set(struct dsa_switch *ds, int port,
struct mxl862xx_priv *priv = ds->priv;
int ret;
+ if (priv->rescue_mode)
+ return;
+
switch (state) {
case BR_STATE_DISABLED:
param.port_state = cpu_to_le32(MXL862XX_STP_PORT_STATE_DISABLE);
diff --git a/drivers/net/dsa/mxl862xx/mxl862xx.h b/drivers/net/dsa/mxl862xx/mxl862xx.h
index 64d91ad51936..5d21296561e3 100644
--- a/drivers/net/dsa/mxl862xx/mxl862xx.h
+++ b/drivers/net/dsa/mxl862xx/mxl862xx.h
@@ -323,6 +323,8 @@ struct mxl862xx_fw_version {
* during a firmware flash
* @skip_teardown: discard firmware API commands during the teardown
* triggered by the post-flash reprobe
+ * @rescue_mode: switch is stuck in MCUboot; firmware API commands
+ * fail fast, only clause-22 SMDIO works
* @stats_work: periodic work item that polls RMON hardware counters
* and accumulates them into 64-bit per-port stats
*/
@@ -343,6 +345,7 @@ struct mxl862xx_priv {
u16 vf_block_size;
bool block_host;
bool skip_teardown;
+ bool rescue_mode;
struct delayed_work stats_work;
};
--
2.55.0
^ permalink raw reply related [flat|nested] 5+ messages in thread