Define getPortPrbsPolynomials in bcm and sai handler

Summary: This diff defines the `getPortPrbsPolynomials` function in both `bcm` and `sai` handlers to retrieve the PRBS polynomials for a given port.

Reviewed By: zechengh09

Differential Revision:
D85903569

Privacy Context Container: L1297311

fbshipit-source-id: f66949986729a64fc907c4a810598eabe7c11e09

Author: Prasoon Patel

fboss/agent/HwSwitchThriftClientTable.cpp

@@ -212,6 +212,13 @@ HwSwitchThriftClientTable::getPortPrbsPolynomials(
     const SwitchID& switchId,
     const PortID& portId) {
   std::vector<prbs::PrbsPolynomial> prbsPolynomials;
+  auto client = getClient(switchId);
+  try {
+    client->sync_getPortPrbsPolynomials(prbsPolynomials, portId);
+  } catch (const std::exception& ex) {
+    XLOG(ERR) << "Failed to get port prbs polynomials for switch : " << switchId
+              << " error: " << ex.what();
+  }
   return prbsPolynomials;
 }
 prbs::InterfacePrbsState HwSwitchThriftClientTable::getPortPrbsState(

fboss/agent/hw/sai/switch/SaiHandler.cpp

@@ -445,5 +445,12 @@ void SaiHandler::clearPortAsicPrbsStats(int32_t portId) {
   hw_->ensureConfigured(__func__);
   hw_->clearPortAsicPrbsStats(PortID(portId));
 }
+void SaiHandler::getPortPrbsPolynomials(
+    std::vector<prbs::PrbsPolynomial>& prbsPolynomials,
+    int32_t portId) {
+  auto log = LOG_THRIFT_CALL(DBG1);
+  hw_->ensureConfigured(__func__);
+  prbsPolynomials = hw_->getPortPrbsPolynomials(PortID(portId));
+}
 
 } // namespace facebook::fboss

fboss/agent/hw/sai/switch/SaiHandler.h

@@ -120,6 +120,9 @@ class SaiHandler : public apache::thrift::ServiceHandler<SaiCtrl> {
       std::vector<phy::PrbsLaneStats>& prbsStats,
       int32_t portId) override;
   void clearPortAsicPrbsStats(int32_t portId) override;
+  void getPortPrbsPolynomials(
+      std::vector<prbs::PrbsPolynomial>& prbsPolynomials,
+      int32_t portId) override;
 
  private:
   SaiSwitch* hw_;