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Add a RIF attribute to specify if the corresponding My MAC entry should not be created.. #2021

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Add a RIF attribute to specify if the corresponding My MAC entry should not be created.. #2021

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13 changes: 13 additions & 0 deletions inc/sairouterinterface.h
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,19 @@ typedef enum _sai_router_interface_attr_t
*/
SAI_ROUTER_INTERFACE_ATTR_SELECTIVE_COUNTER_LIST,

/**
* @brief Attribute used to specify external My MAC entry that will
* be used in place of any implicit entry created during RIF processing
* for this {port, vlan, MAC address}
*
* @type sai_object_id_t
* @flags CREATE_ONLY
* @objects SAI_OBJECT_TYPE_MY_MAC
* @allownull true
* @default SAI_NULL_OBJECT_ID
*/
SAI_ROUTER_INTERFACE_ATTR_MY_MAC,

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@erohsik  

  1. If SAI_ROUTER_INTERFACE_ATTR_MY_MAC is not null, does it mean that the device must not create a termination entry with MAC == SAI_ROUTER_INTERFACE_ATTR_SRC_MAC_ADDRESS?
  2. What is the meaning of binding a RIF to MY_MAC entry? Does it mean that the MY_MAC entry takes effect only for packets that ingress on this RIF? I am trying to see how it relates to SAI_MY_MAC_ATTR_PORT/VLAN_ID
  3. And lastly, why not achieve this by having a SAI_ROUTER_INTERFACE_ATTR_NO_TERM_MAC of type boolean to achieve the goal listed in the heading.

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@erohsik erohsik Nov 25, 2024 •
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  1. Yes, the device will skip creating a termination entry with the RIF SMAC
    2, 3. A bool attribute was in the original change, but during the PR review, a suggestion was mad to add the corresponding MY_MAC entry so that the MY_MAC entry does not get deleted inadvertently while the RIF is still relying on it for L3 forwarding determination.

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Thanks. I prefer your original model over the suggestion. I think all NOS would anyway maintain this reference counting;  we can avoid adding unnecessary state in the SAI implementation.

 Further, the suggested model gives a impression that the pointed to MyMAC entry should only be used by the RIFs that point to this MyMAC entry and vice versa. Today, one RIF can be terminated by more than one MyMAC entries. One MyMAC entry (if we skip SAI_MY_MAC_ATTR_PORT/VLAN_ID) can terminate multiple RIFs.

@JaiOCP @itaibaz Can you please give your feedback on the above. 

Today, SAI_ROUTER_INTERFACE_ATTR_SRC_MAC_ADDRESS is create-and-set, however SAI_ROUTER_INTERFACE_ATTR_MY_MAC is create-only. Any reasons?

/**
* @brief End of attributes
*/
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