Support for running firmware in embedded controllers by JaiOCP · Pull Request #2319 · opencomputeproject/SAI

JaiOCP · 2026-07-21T19:15:16Z

Modern switches have embedded controller to run firmware for low latency applications.
This PR bring in support for installing and monitoring firmware based on the hardware support.

azure-pipelines · 2026-07-21T19:15:25Z

Azure Pipelines: There may be pipelines that require an authorized user to comment /azp run to run.

kcudnik · 2026-07-22T08:50:11Z

you have only SAI_OBJECT_TYPE_FW as readable variable you cant assign it anywhre, its possible to create any of thos objects ? is that by design ?

gananthateerta · 2026-07-23T15:03:10Z

+
+### 2.1 Firmware Object Lifecycle
+
+There are two life cycles that need to be supported.


If firmware crashes, the only way NOS finds out is by polling SAI_FW_ATTR_FW_OP_STATE and noticing it changed to ERROR.

A notification callback, consistent with how SAI handles other async events, is neeed.

Following functionality can be added:
Crash reason?
Core dump?
Auto-restart?

Accepted the feedback. Will add a callback

AnandhiDhanabalan · 2026-07-29T06:09:05Z

+     * @flags CREATE_AND_SET
+     * @default ""
+     */
+    SAI_FW_ATTR_FW_FILE_AND_PATH_NAME,


Should this be CREATE_ONLY | MANDATORY ?
When multiple firmware objects are available, how will the NOS be able to map the firmware object to a specific firmware ?

I was thinking if NOS need to modify the file name for some new encoding we should allow it run time and hence not mandatory.

AnandhiDhanabalan · 2026-07-29T06:11:15Z

+     * @flags CREATE_AND_SET
+     * @default 0
+     */
+    SAI_FW_ATTR_CORE_ID,


For CORE_ID to be changed - what is the allowed oper and admin state ? How do we establish this requirment of specific admin and operstates when CORE_ID is changed ?

Ideally this can be changed only when SAI_FW_ADMIN_STATE_UNLOAD_FW, other admin state should not allow it. Is this understanding correct ?

Some additional thoughts..
The @flags for SAI_FW_ATTR_CORE_ID should be CREATE_ONLY, not CREATE_AND_SET. Changing the core assignment of a firmware object while it is in RUNNING or LOADED state is not meaningful — the F/W is already committed to that core's memory space. To move firmware to a different core, remove and recreate the FW object. If dynamic reassignment is intended (e.g., for load balancing) a new admin state and associated semantics must be defined.

This is a good point. Lets discuss this in meeting

Agreed, Changing the flag the CREATE_ONLY will make things cleaner where if FW need to be spawned on a new core id then the NOS need to do first clean up i.e. stop the fw, delete the fw object and create a new fw object with new core id.

AnandhiDhanabalan · 2026-07-29T06:13:55Z

+     *
+     * @type sai_uint8_t
+     * @flags CREATE_AND_SET
+     * @default 0


How will NOS know supported core-ids ? Should we have a default read-only core-id list ?
Also should we support a default_internal option instead of default, if NOS wants to go with default option ?

There is a readonly attribute for MAX cores. NOS can ping a FW on an abstracted core no of 0 to max-1. This can internally be mapped by the SAI adapter.

Reason I kept it this way is mainly to provide flexibility to silicon vendor to internally id the cores as applicable. Note that cores may not be in single domain space as we talked about.

AnandhiDhanabalan · 2026-07-29T06:16:32Z

+     * @flags CREATE_AND_SET
+     * @default 0
+     */
+    SAI_FW_ATTR_CORE_ID,


Given core_id can have only single f/w object or multiple ?
If Single - how do you upgrade a f/w from say V1 to V2 - Can you give the flow ?
Should core_id be kept as key?

The design must address co-running FW constraints. Some implementations compile multiple features into a single F/W image.

The design doc should also clarify: when two F/W objects share Asic h/w resource, what is the resource arbitration contract? Is it implementation-defined or must it be modeled in SAI?

FW is an abstracted entity and may support one or more features. As I mentioned that features are exposed via separate SAI APIs and have no correlation to FW object.

If FW need to migrated to different core, then it is a destructive event. Ideally FW object should be deleted and recreated with different core id (this is where your suggestion of CREATE_ONLY for core id is valid). And this will impact all the features supported by that instance of FW.

AnandhiDhanabalan · 2026-07-29T06:17:51Z

+* Firmware state monitoring
+* Runtime firmware configuration
+
+The API is exposed through the `sai_fw_api_t` method table, using a new FW object.


How will the existing f/w switch attributes co-exist with this new infra ?

Existing Firmware attributes are very specific to Gearbox with MDIO/EEPROM load methods and can support only single firmware instance.
These attributes are not deprecated and stay such.

NOS can choose existing or the new infra based on the capability query for the device and both can be enabled at the same time if supported.

AnandhiDhanabalan · 2026-07-29T06:19:03Z

+
+    /** Firmware admin state is unload the firmware */
+    SAI_FW_ADMIN_STATE_UNLOAD_FW,
+} sai_fw_admin_state_t;


During warm boot how do we reconnect to the f/w ?
Should we have a additional admin state like sync to indicate warm boot ?

I am not clear what reconnect means? After warmboot NOS will query the admin state and op state to figure out the state of FW.

If reconnect means some kind of RPC channel then note that NOS do not open any RPC channel. If there is one it is internal to the chip vendor.

AnandhiDhanabalan · 2026-07-29T06:23:20Z

+
+    /** Firmware admin state */
+    sai_fw_admin_state_t admin_state;
+} sai_fw_inst_t;


Can we have a vendor specific read-only string added to sai_fw_inst_t ? To identify the f/w, type etc or aA firmware role/type attribute is needed to bind a FW object to its consuming SAI subsystem.

Could you specify how the relationship between SAI_OBJECT_TYPE_FW and any other object in the sai system that uses this firmware object, say SAI_OBJECT_TYPE_TAM or SAI_OBJECT_TYPE_TAM_INT is established ?

Vendor specific request was discussed in meeting. If there is a need to specify any kind of hint for SDK to pick on for some vendor specific operations that can be encoded in the FW file name.

SAI_OBJECT_TYPE_FW has a naroow focus of manaigng the life cycle of the firmware. What kind of functionality it exposes is not part of this PR.

Typically any function either by the FW or the native switch silicon is abstracted independently as a SAI API. For example TAM functions can be implemented using a firmware. In this firmware life cycle management is done by the FW object and function is exposed using the TAM object. There is no coupling between two within the SAI framework.

Good question though :)

AnandhiDhanabalan · 2026-07-29T10:05:47Z

+| SAI_FW_OP_STATE_NOT_LOADED | Firmware unavailable and not loaded|
+| SAI_FW_OP_STATE_RUNNING    | Firmware loaded and running     |
+| SAI_FW_OP_STATE_STOPPED    | Firmware loaded but stopped     |
+| SAI_FW_OP_STATE_ERROR      | Firmware loaded and encountered an error   |


For ASICs with async FW loading, transitional states are needed:

SAI_FW_OP_STATE_LOADING, // image transfer in progress SAI_FW_OP_STATE_STOPPING, // graceful shutdown in progress

Without these, the NOS has no way to distinguish "FW load not started" from "FW load in progress" when polling SAI_FW_ATTR_FW_OP_STATE. Also consider adding a notification callback (SAI_SWITCH_ATTR_FW_STATE_CHANGE_NOTIFY) so the NOS doesn't need to poll.

eladnachman · 2026-08-02T13:57:03Z

+/**
+ * @brief Defines maximum length of firmware and log file name
+ */
+#define SAI_FW_NAME_SIZE 64


Why is the limited set at 64 bytes? According to the PR documentation this is used for both the path and the file name. Under complex Linux mounting, this limit might not be enough. Consider enlarging to at least 128 if not 256.

Agree. I will change the size to 256.

Signed-off-by: JaiOCP <jai.kumar@broadcom.com> Multiple Firmware Support Signed-off-by: JaiOCP <jai.kumar@broadcom.com>

…opencomputeproject#2308) Fixes opencomputeproject#2307 Two fixes in the SAI_STATUS_IS_* helpers in inc/saistatus.h: Compare on the magnitude (SAI_STATUS_CODE(x)) before masking, so the range check is correct for negative status codes on Linux. Previously a non-zero attribute index borrowed across the 16-bit boundary and matched the wrong range (e.g. INVALID_ATTR_VALUE index 3 classified as ATTR_NOT_IMPLEMENTED). No-op on Windows, where SAI_STATUS_CODE is identity. Fix SAI_STATUS_IS_UNKNOWN_ATTRIBUTE, which compared against SAI_STATUS_INVALID_ATTRIBUTE_0 instead of SAI_STATUS_UNKNOWN_ATTRIBUTE_0 (wrong on all platforms).

… fixes (opencomputeproject#2299) Context / motivation This PR is part of the SAIVPP unit-test framework: a Docker harness (docker-sai-test-vpp) that runs the upstream OCP sai_test PTF suite against the real VPP SAI backend (libsaivs) in one container — VPP + saiserver + PTF + veth/AF_PACKET topology. That work is documented in our devdocs under sonic-sairedis/.azure-pipelines/docker-sai-test-vpp/devdocs/ (see progress.md). To run the suite, saiserver (saithriftv2) must build and link against the VPP SAI backend on a bookworm/python3 toolchain. Upstream saithriftv2 only has a vs link line and a python2.7 install path, so it does not build for the vpp platform on bookworm. This is Phase 1, Task 2 of the SAIVPP UT HLD (the saithriftv2 Makefile work). What this change does Build/packaging only, no test logic: test/saithriftv2/Makefile — add a platform=vpp link line that pulls in the 5 VPP libraries SaiVppXlate.c requires (-lvlib -lvlibapi -lvppapiclient -lvlibmemoryclient -lvppinfra) plus -lswsscommon; also add -lswsscommon to the vs line. test/saithriftv2/src/saiserver.cpp — enable SWSS debug logging at startup (swss::Logger to STDOUT), so the harness captures a high-level SAI RPC trace in saiserver.log (used throughout our debugging). debian/python-saithrift.install — install the Python bindings from the python3 dist-packages path so the package builds on bookworm (was hardcoded to python2.7/site-packages). test/saithriftv2/convert_header.py — fix an enum __str__ that did split(".")[1] and threw an IndexError on some enum names; use self.name instead. Scope / risk 4 files, +11/−3 — build flags, a packaging path, a logging init, and a one-line stringification fix. No change to SAI semantics, RPC surface, or test logic. The vpp link line is new (additive); the vs line only gains -lswsscommon.

…pencomputeproject#2300) Context / motivation Part of the SAIVPP unit-test framework (see PR 1 / our docker-sai-test-vpp/devdocs/). When running the OCP sai_test suite against the VPP SAI backend, neighbor- and route-create tests failed at create time with SAI_STATUS_INVALID_PARAMETER (-5): ERROR: meta_generic_validation_create: switch id is NULL for SAI_OBJECT_TYPE_NEIGHBOR_ENTRY Root cause sai_thrift_neighbor_entry_t / sai_thrift_route_entry_t carry a switch_id, but many OCP tests build these entries with only rif_id (+ ip_address / destination) and omit switch_id. The saithriftv2 RPC server copied the thrift switch_id straight through, so meta validation received switch_id == 0 and rejected the create. (Tests that pass through the common-config path, which sets switch_id explicitly, succeeded — only entries that omit it failed.) What this change does meta/templates/sai_rpc_server_helper_functions.tt — custom sai_thrift_parse_neighbor_entry() / sai_thrift_parse_route_entry() that, when the thrift switch_id is 0, fall back to the RPC-global switch_id (the OID returned by sai_thrift_create_switch) and then gSwitchId. (The auto-generated struct copies for these two entry types are skipped in favor of these.) test/saithrift/src/switch_sai.thrift, switch_sai_rpc_server.cpp — the same switch_id field + fallback in the legacy v1 thrift server, for parity. test/sai_test/config/route_configer.py — pass switch_id=self.dut.switch_id explicitly on the route entries the common config builds, so the persisted T0 config is consistent regardless of the fallback. This mirrors how a real ASIC SAI shim behaves (the switch is unambiguous), and unblocks the neighbor/route-create-on-RIF tests. Scope / risk 4 files, +79/−18 — RPC-server parsing for two entry types (+ v1 parity) and explicit switch_id in the test common config. No change to SAI behavior for callers that already pass switch_id — the fallback only triggers when it is 0/omitted. Server-side only; no packet-path or test-logic change. Dependencies None. Related to opencomputeproject#2299, however, their edits are isolated and each target master.

…tdevs for standalone benches (opencomputeproject#2316) Context / motivation Part of the SAIVPP unit-test framework (see the sonic-sairedis docker-sai-test-vpp harness). When the OCP sai_test T0 suite runs against a SAI backend on a standalone bench with no SONiC control plane, there is no teamd to create PortChannel netdevs and no IntfMgr to assign LAG/SVI interface IPs — which some backends (e.g. the VPP virtual switch) rely on for LAG bring-up and routed-to-LAG/SVI forwarding. This adds an opt-in way for the test setup to emulate that. What this change does test/sai_test/config/simulate_sonic.py (new). Opt-in helper, active only when SIMULATE_SONIC=1; every entry point is a no-op otherwise. test/sai_test/config/lag_configer.py — create_lag(). When enabled, create the PortChannel<N> netdev teamd would provide, before the SAI LAG create. test/sai_test/config/route_configer.py — create_router_interface(). When enabled, assign the connected IPs IntfMgr would set on a LAG or VLAN(SVI) router interface. Vendor-neutral by construction. PortChannel netdevs use generic Linux ip … type bond; LAG RIF IPs use ip addr add. A VLAN SVI has no host-interface netdev to mirror from, so its address is programmed via command templates supplied by the caller (SVI_RIF_SET_IP_CMD / SVI_RIF_PROBE_CMD, with {ifname}/{addr} placeholders) — no backend-specific tooling is hardcoded in sai_test. All interface-name prefixes and address patterns are env-overridable. Scope / risk 3 files (one new module + two setUp-path hooks) — test-config helpers only; no change to SAI/backend code or packet semantics. Fully opt-in with default-off: with SIMULATE_SONIC unset, all entry points no-op, so real-HW and other OCP consumers are unchanged unless they opt in. Dependencies None. Independent of opencomputeproject#2299 / opencomputeproject#2300 / opencomputeproject#2301 (edits different functions); targets master.

…ix v4/v6 NHG port-list aliasing (opencomputeproject#2301) Context / motivation Part of the SAIVPP unit-test framework (see PR 1 / our docker-sai-test-vpp/devdocs/, esp. the 6-19 entry). Three independent correctness/robustness fixes in the OCP sai_test config helpers that the suite needs when run against the VPP SAI backend. What this change does test/sai_test/config/port_configer.py — drop bridge_id on create_bridge_port. Passing bridge_id to sai_thrift_create_bridge_port caused a create failure in our backend; the default 1Q bridge is used, so the argument is redundant. Removing it lets bridge-port creation succeed. test/sai_test/config/port_configer.py — env-gated, bounded port bring-up wait. turn_up_and_get_checked_ports() waited per port, serially (retries × sleep) for oper-status UP. On a 32-port topology where oper-status is slow to settle, this is ~60s+ of dead time per common-config build. The wait is now tunable via env (SAI_PORT_UP_RETRIES, SAI_PORT_UP_POLL_INTERVAL, SAI_PORT_UP_SHARED_WAIT) and can poll all ports together in one bounded window. Defaults preserve the original behavior (per-port wait), so real-HW/other OCP consumers are unchanged unless they opt in; only our harness sets the fast values. test/sai_test/config/route_configer.py — give v4/v6 NHGs independent member_port_indexs. create_nexthop_group_by_nexthops() constructed the v4 and v6 NexthopGroup objects sharing one Python list object for member_port_indexs. A mutation on one group (member remove/re-add tests) then corrupted the other's port list (ValueError: list.remove(x): x not in list). Each group now gets its own list(...) copy. (Latent aliasing bug, independent of any harness specifics.) Scope / risk 2 files, +64/−25 — test-config helpers only; no change to SAI/backend code or packet semantics. The port-up change is opt-in via env with original defaults, so it does not alter timing for existing consumers. The bridge_id removal relies on the default 1Q bridge (already how these tests are used). Dependencies None. Related to opencomputeproject#2299 and opencomputeproject#2300, however, their edits are isolated and each target master.

Signed-off-by: Prince George <prgeor@microsoft.com>

…uteproject#2321) Context / motivation Part of the SAIVPP unit-test framework. When OCP sai_test runs on a standalone bench with SIMULATE_SONIC=1, the bench emulates SONiC control-plane setup for LAG/SVI router interfaces. During that setup, a simulated router can emit IPv6 lifecycle frames such as Router Solicitations and MLDv2 reports. These frames share PTF dataplane queues with test traffic and can make strict verify_no_other_packets() assertions fail even though the test's TCP/UDP forwarding behavior is correct. The sonic-sairedis harness previously used PTF --relax globally, which disabled all unexpected-packet checks and masked this issue. The harness now scopes --relax to positive flooding tests only, so the shared simulation helper needs a narrow, opt-in way to isolate known startup control traffic without suppressing actual dataplane failures. What this change does test/sai_test/config/simulate_sonic.py. Adds an opt-in PTF filter enabled only when SIMULATE_SONIC=1 and a caller provides SIMULATE_SONIC_IPV6_CONTROL_SRC_MAC. Exact filtering. Discards only IPv6 ICMP Router Solicitations (type 133 to ff02::2) and MLDv2 reports (type 143 to ff02::16, including the standard Hop-by-Hop header) emitted from that configured source MAC. No vendor hardcoding. The caller supplies the source MAC. The shared helper does not contain VPP-specific MAC addresses or commands. Linux IPv6 setup ordering. Configures accept_dad=0, accept_ra=0, autoconf=0, and router_solicitations=0 before re-enabling IPv6 on a simulated LAG host interface, preventing a DAD/router-discovery race. Scope / risk One shared test-config helper. No SAI headers, backend code, or production SONiC runtime behavior changes. Default-off: with SIMULATE_SONIC unset, or without a valid source MAC, the helper installs no filter and retains existing behavior. Narrow by construction: ordinary IPv4/IPv6 traffic, other ICMPv6 types, and matching control frames from other source MACs stay visible to PTF strict verification. Validated behavior: unit-level boundary checks used captured Router Solicitation and MLDv2 frames and confirmed that ordinary traffic is retained. A standalone VPP harness rerun recovered all eleven classes previously failing solely on background IPv6 lifecycle traffic. Dependencies None. The change extends the existing SIMULATE_SONIC helper implemented in opencomputeproject#2316 and is independent of the prior SIMULATE_SONIC PR once that PR is merged. The sonic-sairedis VPP harness enables the option only in its separate Phase 3 integration branch. Signed-off-by: Nicholas Ching <nicholaslching@gmail.com>z

* add SAI definitions for optical circuit switch Signed-off-by: Nathan Ni <nathan.ni@coherent.com>

Summary: This is similar to opencomputeproject#1158, opencomputeproject#1407, opencomputeproject#1430. Those PRs added label attribute for LAG/virtual router, counter, ACL Counter. This PR adds similar label attribute for ACL entries. Adding a label attribute that can be used to uniquely identify ACL entry object during warmboot. This attribute is considered as user data attached to the object. Signed-off-by: Shrikrishna (Shri) Khare <skhare@meta.com> Signed-off-by: Jasmeet Bagga <jasmeetbagga@meta.com> Signed-off-by: Ron He <zecheng@meta.com> Co-authored-by: Ron He <zecheng@meta.com>

JaiOCP · 2026-08-07T20:17:26Z

you have only SAI_OBJECT_TYPE_FW as readable variable you cant assign it anywhre, its possible to create any of thos objects ? is that by design ?

This is by design. SAI adapter will create these objects that should be readable.

crameshk · 2026-08-10T19:26:46Z

+     * The maximum number of characters for the name is SAI_FW_NAME_SIZE - 1 since
+     * it needs the terminating null byte ('\0') at the end.
+     *
+     * @type char


Should this be sai_s8_list_t like line 99 above for fw_path_name variable.

/** Firmware path */ sai_s8_list_t fw_path_name;

crameshk · 2026-08-10T19:27:32Z

+     * The maximum number of characters for the name is SAI_FW_NAME_SIZE - 1 since
+     * it needs the terminating null byte ('\0') at the end.
+     *
+     * @type char


Same: Should this be sai_s8_list_t like line 102 above for fw_path_name variable.

/** Firmware log file path */ sai_s8_list_t log_path_name;

AvivAgam10 · 2026-08-11T07:03:37Z

+ * @brief SAI firmware administrative state
+ */
+typedef enum _sai_fw_admin_state_t
+{


Is the expectation that every SAI implementation must support all admin-state transitions (LOAD/UNLOAD/START/STOP) independently, or is atomic load-and-run the only mandatory one and the rest optional?
If the latter, the spec needs a capability attribute to advertise which transitions a platform supports, plus a standard "not supported" status — otherwise a NOS can't tell an unsupported mode from a real failure.

Signed-off-by: JaiOCP <jai.kumar@broadcom.com>

kcudnik reviewed Jul 22, 2026

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Comment thread inc/saifw.h

kcudnik reviewed Jul 22, 2026

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Comment thread meta/parse.pl

gananthateerta reviewed Jul 23, 2026

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tjchadaga added the reviewed PR is discussed in SAI Meeting label Jul 24, 2026

AnandhiDhanabalan reviewed Jul 29, 2026

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eladnachman reviewed Aug 2, 2026

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JaiOCP and others added 10 commits August 7, 2026 13:09

Support for Multiple Firmware

872a8d6

Signed-off-by: JaiOCP <jai.kumar@broadcom.com> Multiple Firmware Support Signed-off-by: JaiOCP <jai.kumar@broadcom.com>

APSU SAI port attributes (opencomputeproject#2303)

f32259a

Signed-off-by: Prince George <prgeor@microsoft.com>

add SAI definitions for optical circuit switch (opencomputeproject#2229)

fc18979

* add SAI definitions for optical circuit switch Signed-off-by: Nathan Ni <nathan.ni@coherent.com>

JaiOCP force-pushed the fw branch from ca85bd8 to ed377ca Compare August 7, 2026 20:11

Merge branch 'master' into fw

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crameshk reviewed Aug 10, 2026

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AvivAgam10 reviewed Aug 11, 2026

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JaiOCP added 2 commits August 13, 2026 12:13

Merge branch 'master' into fw

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Signed-off-by: JaiOCP <jai.kumar@broadcom.com>


		### 2.1 Firmware Object Lifecycle

		There are two life cycles that need to be supported.

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