Modified reboot pre-shutdown script to handle dpu side reboot by SahilChaudhari · Pull Request #26234 · sonic-net/sonic-buildimage

SahilChaudhari · 2026-03-17T18:17:47Z

Why I did it

As a part of GNOI reboot sequence for DPU, it is calling reboot -p which does pre shutdown sequence on DPU.
Post GNOI reboot sequence completes, NPU removes bridge-midplane (PCIE) connection between NPU and DPU. Then DPU need to trigger reboot.

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Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

mssonicbld · 2026-03-17T18:17:56Z

/azp run Azure.sonic-buildimage

azure-pipelines · 2026-03-17T18:18:09Z

Azure Pipelines successfully started running 1 pipeline(s).

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

mssonicbld · 2026-03-18T03:53:00Z

/azp run Azure.sonic-buildimage

azure-pipelines · 2026-03-18T03:53:12Z

Azure Pipelines successfully started running 1 pipeline(s).

Copilot

Pull request overview

This PR updates Pensando DPU shutdown/reboot handling to better support GNOI-triggered reboot flows where the NPU may remove the PCIe/midplane connection after the initial pre-shutdown sequence, requiring the DPU to force a reboot/power-cycle path.

Changes:

Enable a Pensando firmware reboot behavior via a sysfs knob during DPU (polaris pipeline) startup.
Extend the platform pre_reboot_hook to spawn a detached watchdog loop that pings the host and triggers a CPLD power cycle after consecutive reachability failures.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
`files/dsc/dpu.init`	Writes `panic_reboot` sysfs setting during `start_polaris()` initialization.
`device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook`	Adds a detached ping-and-retry loop that triggers `cpldapp -pwrcycle` on repeated failures.

Copilot · 2026-03-23T20:56:42Z

files/dsc/dpu.init

    mkdir -p $HOST_DIR_POLARIS/mnt/a/mnt/work
    mkdir -p $DPU_DOCKER_INFO_DIR
    echo 256 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
+    echo 1 > /sys/firmware/pensando/reboot/panic_reboot


Write to /sys/firmware/pensando/reboot/panic_reboot is unguarded. If this sysfs node is missing or not writable on some images/kernel configs, this will emit errors during boot. Consider checking -w (or -e) before writing and log a clear message when unavailable.

Suggested change

echo 1 > /sys/firmware/pensando/reboot/panic_reboot

if [ -w /sys/firmware/pensando/reboot/panic_reboot ]; then

echo 1 > /sys/firmware/pensando/reboot/panic_reboot

else

log_msg "Pensando panic_reboot sysfs node not writable; skipping configuration"

fi

Copilot · 2026-03-23T20:56:42Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

 docker exec "$(cat /host/dpu-docker-info/name)" /nic/bin/cpldapp -w 0xd 200

+# Spawn fully independent background process to ping host and trigger power cycle if unreachable
+# Algorithm: If ping fails, wait 10 seconds and retry. After 3 consecutive failures, trigger power cycle.
+# Using setsid + nohup to completely detach from parent process (daemonize)
+DPU_CONTAINER_NAME=$(cat /host/dpu-docker-info/name)
+setsid nohup bash -c "
+    DPU_CONTAINER='$DPU_CONTAINER_NAME'
+    HOST_IP='169.254.200.254'
+    TIMEOUT=120
+    POLL_INTERVAL=5
+    ELAPSED=0
+    MAX_FAILURES=3
+    RETRY_WAIT=10
+
+    while [ \$ELAPSED -lt \$TIMEOUT ]; do
+        if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then
+            echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console
+        else
+            echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console
+            FAIL_COUNT=1
+
+            # Retry loop: wait 10 seconds between each retry, up to MAX_FAILURES total attempts
+            while [ \$FAIL_COUNT -lt \$MAX_FAILURES ]; do
+                echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, waiting \$RETRY_WAIT seconds before retry...\" | tee /dev/kmsg /dev/console
+                sleep \$RETRY_WAIT
+
+                if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then
+                    echo \"Ping to \$HOST_IP recovered after \$FAIL_COUNT failures\" | tee /dev/kmsg /dev/console
+                    FAIL_COUNT=0
+                    break
+                fi
+                FAIL_COUNT=\$((FAIL_COUNT + 1))
+            done
+
+            # If we exhausted all retries (3 consecutive failures), trigger power cycle
+            if [ \$FAIL_COUNT -ge \$MAX_FAILURES ]; then
+                echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, all retries exhausted\" | tee /dev/kmsg /dev/console
+                echo \"Triggering cpld power cycle after \$MAX_FAILURES consecutive ping failures\" | tee /dev/kmsg /dev/console
+                docker exec \"\$DPU_CONTAINER\" /nic/bin/cpldapp -pwrcycle
+                exit 0
+            fi
+        fi
+        sleep \$POLL_INTERVAL
+        ELAPSED=\$((ELAPSED + POLL_INTERVAL))
+    done
+    echo \"Ping to \$HOST_IP remained successful for \$TIMEOUT seconds, no power cycle triggered\" | tee /dev/kmsg /dev/console
+" </dev/null >/dev/null 2>&1 &


DPU_CONTAINER_NAME=$(cat /host/dpu-docker-info/name) assumes the file exists and contains a valid container name. If the file is missing/empty, the background logic will later run docker exec with an empty container name and silently fail. Please add an existence/empty check (and log) before spawning the background process.

Suggested change

docker exec "$(cat /host/dpu-docker-info/name)" /nic/bin/cpldapp -w 0xd 200

# Spawn fully independent background process to ping host and trigger power cycle if unreachable

# Algorithm: If ping fails, wait 10 seconds and retry. After 3 consecutive failures, trigger power cycle.

# Using setsid + nohup to completely detach from parent process (daemonize)

DPU_CONTAINER_NAME=$(cat /host/dpu-docker-info/name)

setsid nohup bash -c "

DPU_CONTAINER='$DPU_CONTAINER_NAME'

HOST_IP='169.254.200.254'

TIMEOUT=120

POLL_INTERVAL=5

ELAPSED=0

MAX_FAILURES=3

RETRY_WAIT=10

while [ \$ELAPSED -lt \$TIMEOUT ]; do

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console

else

echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console

FAIL_COUNT=1

# Retry loop: wait 10 seconds between each retry, up to MAX_FAILURES total attempts

while [ \$FAIL_COUNT -lt \$MAX_FAILURES ]; do

echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, waiting \$RETRY_WAIT seconds before retry...\" | tee /dev/kmsg /dev/console

sleep \$RETRY_WAIT

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

echo \"Ping to \$HOST_IP recovered after \$FAIL_COUNT failures\" | tee /dev/kmsg /dev/console

FAIL_COUNT=0

break

fi

FAIL_COUNT=\$((FAIL_COUNT + 1))

done

# If we exhausted all retries (3 consecutive failures), trigger power cycle

if [ \$FAIL_COUNT -ge \$MAX_FAILURES ]; then

echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, all retries exhausted\" | tee /dev/kmsg /dev/console

echo \"Triggering cpld power cycle after \$MAX_FAILURES consecutive ping failures\" | tee /dev/kmsg /dev/console

docker exec \"\$DPU_CONTAINER\" /nic/bin/cpldapp -pwrcycle

exit 0

fi

fi

sleep \$POLL_INTERVAL

ELAPSED=\$((ELAPSED + POLL_INTERVAL))

done

echo \"Ping to \$HOST_IP remained successful for \$TIMEOUT seconds, no power cycle triggered\" | tee /dev/kmsg /dev/console

" </dev/null >/dev/null 2>&1 &

DPU_NAME_FILE="/host/dpu-docker-info/name"

if [ ! -s "$DPU_NAME_FILE" ]; then

LOG_MSG "DPU container name file '$DPU_NAME_FILE' is missing or empty; skipping CPLD operations"

else

DPU_CONTAINER_NAME=$(cat "$DPU_NAME_FILE")

docker exec "$DPU_CONTAINER_NAME" /nic/bin/cpldapp -w 0xd 200

# Spawn fully independent background process to ping host and trigger power cycle if unreachable

# Algorithm: If ping fails, wait 10 seconds and retry. After 3 consecutive failures, trigger power cycle.

# Using setsid + nohup to completely detach from parent process (daemonize)

setsid nohup bash -c "

DPU_CONTAINER='$DPU_CONTAINER_NAME'

HOST_IP='169.254.200.254'

TIMEOUT=120

POLL_INTERVAL=5

ELAPSED=0

MAX_FAILURES=3

RETRY_WAIT=10

while [ \$ELAPSED -lt \$TIMEOUT ]; do

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console

else

echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console

FAIL_COUNT=1

# Retry loop: wait 10 seconds between each retry, up to MAX_FAILURES total attempts

while [ \$FAIL_COUNT -lt \$MAX_FAILURES ]; do

echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, waiting \$RETRY_WAIT seconds before retry...\" | tee /dev/kmsg /dev/console

sleep \$RETRY_WAIT

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

echo \"Ping to \$HOST_IP recovered after \$FAIL_COUNT failures\" | tee /dev/kmsg /dev/console

FAIL_COUNT=0

break

fi

FAIL_COUNT=\$((FAIL_COUNT + 1))

done

# If we exhausted all retries (3 consecutive failures), trigger power cycle

if [ \$FAIL_COUNT -ge \$MAX_FAILURES ]; then

echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, all retries exhausted\" | tee /dev/kmsg /dev/console

echo \"Triggering cpld power cycle after \$MAX_FAILURES consecutive ping failures\" | tee /dev/kmsg /dev/console

docker exec \"\$DPU_CONTAINER\" /nic/bin/cpldapp -pwrcycle

exit 0

fi

fi

sleep \$POLL_INTERVAL

ELAPSED=\$((ELAPSED + POLL_INTERVAL))

done

echo \"Ping to \$HOST_IP remained successful for \$TIMEOUT seconds, no power cycle triggered\" | tee /dev/kmsg /dev/console

" </dev/null >/dev/null 2>&1 &

fi

Copilot · 2026-03-23T20:56:43Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

+    while [ \$ELAPSED -lt \$TIMEOUT ]; do
+        if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then
+            echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console


Ping is not bound to the midplane interface, so any alternate route to 169.254.200.254 (or cached neighbor state) could produce a false “reachable” result even after PCIe bridge removal. Consider using ping -I <midplane-iface> (or an equivalent interface-scoped check) so the decision reflects the intended link.

Copilot · 2026-03-23T20:56:43Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

+            # If we exhausted all retries (3 consecutive failures), trigger power cycle
+            if [ \$FAIL_COUNT -ge \$MAX_FAILURES ]; then
+                echo \"Ping failure \$FAIL_COUNT/\$MAX_FAILURES, all retries exhausted\" | tee /dev/kmsg /dev/console
+                echo \"Triggering cpld power cycle after \$MAX_FAILURES consecutive ping failures\" | tee /dev/kmsg /dev/console
+                docker exec \"\$DPU_CONTAINER\" /nic/bin/cpldapp -pwrcycle
+                exit 0


The power-cycle trigger uses docker exec from a detached background process. During shutdown/reboot, the Docker daemon or container may be unavailable/hung, which can prevent cpldapp -pwrcycle from running. Consider invoking the CPLD utility from the host context if possible, or at least add a bounded timeout/retry around docker exec and log failures explicitly.

Copilot · 2026-03-23T20:56:43Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

+
+    while [ \$ELAPSED -lt \$TIMEOUT ]; do
+        if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then
+            echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console
+        else
+            echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console


This loop logs to kmsg/console every POLL_INTERVAL even when the host remains reachable, which can create noisy logs during shutdown. Consider logging only on state transitions (reachable→unreachable and vice versa) or throttling success messages.

Suggested change

while [ \$ELAPSED -lt \$TIMEOUT ]; do

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console

else

echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console

LAST_STATE=\"unknown\"

while [ \$ELAPSED -lt \$TIMEOUT ]; do

if ping -c 1 -W 1 \"\$HOST_IP\" > /dev/null 2>&1; then

# Log success only when transitioning to reachable state

if [ \"\$LAST_STATE\" != \"up\" ]; then

echo \"Ping to \$HOST_IP successful, host is still reachable\" | tee /dev/kmsg /dev/console

LAST_STATE=\"up\"

fi

else

# Log failure only when transitioning to unreachable state

if [ \"\$LAST_STATE\" != \"down\" ]; then

echo \"Ping to \$HOST_IP failed, starting failure retry sequence\" | tee /dev/kmsg /dev/console

LAST_STATE=\"down\"

fi

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

rameshraghupathy

@SahilChaudhari LGTM besides two minor comments as copilot. 1. Please guard the panic_reboot sysfs write, bind the host ping to the intended midplane interface 2. avoid relying only on detached docker exec for the final cpldapp -pwrcycle path during shutdown/reboot. I'm approving it.

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

mssonicbld · 2026-03-31T14:34:04Z

/azp run Azure.sonic-buildimage

azure-pipelines · 2026-03-31T14:34:19Z

Azure Pipelines successfully started running 1 pipeline(s).

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot · 2026-04-01T05:05:49Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

+DPU_NAME_FILE="/host/dpu-docker-info/name"
+if [ ! -s "$DPU_NAME_FILE" ]; then
+    LOG_MSG "DPU container name file '$DPU_NAME_FILE' is missing or empty; skipping CPLD operations"
+    exit 1


The script logs that it is "skipping CPLD operations" when the DPU container name file is missing/empty, but then exits with status 1. That makes this path look like a hard failure rather than a best-effort skip and can break the reboot flow on systems where /host/dpu-docker-info/name is not populated. Consider returning success (exit 0) or continuing without CPLD operations instead of exiting non-zero here.

Suggested change

exit 1

Copilot · 2026-04-01T05:05:50Z

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

+# Fetch NTP server IP from CONFIG_DB (typically the host/midplane IP)
+NTP_SERVER_KEY=$(sonic-db-cli CONFIG_DB keys 'NTP_SERVER*' | head -1)
+if [ -z "$NTP_SERVER_KEY" ]; then
+    LOG_MSG "ERROR: NTP_SERVER not found in CONFIG_DB, aborting pre-reboot hook"
+    exit 1
+fi
+
+HOST_IP=$(echo "$NTP_SERVER_KEY" | cut -d'|' -f2)
+if [ -z "$HOST_IP" ]; then
+    LOG_MSG "ERROR: Failed to extract host IP from NTP_SERVER key '$NTP_SERVER_KEY', aborting pre-reboot hook"
+    exit 1
+fi
+LOG_MSG "Using host IP from CONFIG_DB: $HOST_IP"
+


HOST_IP is derived from the first NTP_SERVER* key in CONFIG_DB (keys ... | head -1). NTP_SERVER is user-configurable and may contain multiple entries (including pools/FQDNs), so the first key is not guaranteed to be the midplane/host IP you intend to monitor. This can cause false ping failures (and unintended CPLD power-cycles) if the first NTP server is not reachable via the midplane interface. Prefer a deterministic source for the host/midplane IP (e.g., explicitly use 169.254.200.254 for smartswitch DPU, read MID_PLANE_BRIDGE ip_prefix, or derive the midplane gateway from the interface configuration) instead of selecting an arbitrary NTP_SERVER entry.

Suggested change

# Fetch NTP server IP from CONFIG_DB (typically the host/midplane IP)

NTP_SERVER_KEY=$(sonic-db-cli CONFIG_DB keys 'NTP_SERVER*' | head -1)

if [ -z "$NTP_SERVER_KEY" ]; then

LOG_MSG "ERROR: NTP_SERVER not found in CONFIG_DB, aborting pre-reboot hook"

exit 1

fi

HOST_IP=$(echo "$NTP_SERVER_KEY" | cut -d'|' -f2)

if [ -z "$HOST_IP" ]; then

LOG_MSG "ERROR: Failed to extract host IP from NTP_SERVER key '$NTP_SERVER_KEY', aborting pre-reboot hook"

exit 1

fi

LOG_MSG "Using host IP from CONFIG_DB: $HOST_IP"

# Use deterministic host/midplane IP instead of inferring from NTP_SERVER in CONFIG_DB

HOST_IP="169.254.200.254"

LOG_MSG "Using fixed host/midplane IP: $HOST_IP"

device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

mssonicbld · 2026-04-03T03:56:06Z

/azp run Azure.sonic-buildimage

azure-pipelines · 2026-04-03T03:56:17Z

Azure Pipelines successfully started running 1 pipeline(s).

prsunny · 2026-04-03T17:42:15Z

@yxieca , would you help with merge?

mssonicbld · 2026-04-03T18:10:24Z

Cherry-pick PR to 202511: #26545

Modified reboot pre-shutdown script to handle dpu side reboot

e0a3919

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

Added fix for reboot dpu on kernel panic

77b3429

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

SahilChaudhari requested a review from lguohan as a code owner March 18, 2026 03:52

vvolam requested a review from Copilot March 23, 2026 20:53

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prsunny added Request for 202511 Branch Approved for 202511 Branch labels Mar 23, 2026

rameshraghupathy self-assigned this Mar 27, 2026

rameshraghupathy self-requested a review March 27, 2026 13:28

rameshraghupathy previously approved these changes Mar 27, 2026

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Addressed comments

9c957e4

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

SahilChaudhari dismissed rameshraghupathy’s stale review via 9c957e4 March 31, 2026 14:33

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device/pensando/arm64-elba-asic-flash128-r0/pre_reboot_hook Outdated Show resolved Hide resolved

Changed fetching of host ip to bridge-midplane.network

547adb5

Signed-off-by: Sahil Chaudhari <sahil.chaudhari@amd.com>

SahilChaudhari dismissed rameshraghupathy’s stale review via 547adb5 April 3, 2026 03:55

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yxieca merged commit 7c072e7 into sonic-net:master Apr 3, 2026
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mssonicbld mentioned this pull request Apr 3, 2026

[action] [PR:26234] Modified reboot pre-shutdown script to handle dpu side reboot #26545

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mssonicbld added the Created PR to 202511 Branch label Apr 3, 2026

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SahilChaudhari commented Mar 17, 2026

Why I did it

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Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

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