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[Nexthop] fast-reboot: save FDB, ARP and route state for platforms that cold-start SAI after kexec #4757

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[Nexthop] fast-reboot: save FDB, ARP and route state for platforms that cold-start SAI after kexec #4757

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25 changes: 25 additions & 0 deletions scripts/fast-reboot
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,9 @@ LOG_PATH="/var/log/${REBOOT_TYPE}.txt"
UIMAGE_HDR_SIZE=64
REQUIRE_TEAMD_RETRY_COUNT=no

FAST_BOOT_DIR=/host/fast-reboot
FAST_REBOOT_DUMP=/usr/local/bin/fast-reboot-dump.py

EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_NOT_SUPPORTED=2
Expand Down Expand Up @@ -503,6 +506,25 @@ function backup_database()
fi
}

function dump_state_for_fast_boot()
{
if [[ ! -x "$FAST_REBOOT_DUMP" ]]; then
debug "$FAST_REBOOT_DUMP not found; skipping fast-boot state dump"
return
fi
if [[ $NUM_ASIC -gt 1 ]]; then
debug "Multi-ASIC: skipping fast-boot state dump (unsupported)"
return
fi
rm -rf "$FAST_BOOT_DIR"
mkdir -p "$FAST_BOOT_DIR"
debug "Dumping FDB/ARP/route/serdes state to $FAST_BOOT_DIR ..."
if ! "$FAST_REBOOT_DUMP" -t "$FAST_BOOT_DIR"; then
debug "fast-reboot-dump.py exited $? — cleaning up $FAST_BOOT_DIR and continuing"
rm -rf "$FAST_BOOT_DIR"
fi
}

function check_mirror_session_acls()
{
debug "Checking if mirror session ACLs (arp, nd) programmed to ASIC successfully"
Expand Down Expand Up @@ -1131,6 +1153,9 @@ if [[ "${REBOOT_TYPE}" = "warm-reboot" || "${REBOOT_TYPE}" = "fastfast-reboot" |
execute_in_namespaces asic increase_teamd_retry_count
fi

if [[ "$REBOOT_TYPE" = "fast-reboot" ]]; then
dump_state_for_fast_boot
fi

# We are fully committed to reboot from this point on because critical
# service will go down and we cannot recover from it.
Expand Down
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