[action] [PR:12605] [Mellanox] Support DSCP remapping in dual ToR topo on T0 switch#13745
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yxieca merged 1 commit intosonic-net:202205from Feb 10, 2023
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…c-net#12605) - Why I did it Support DSCP remapping in dual ToR topo on T0 switch for SKU Mellanox-SN4600c-C64, Mellanox-SN4600c-D48C40, Mellanox-SN2700, Mellanox-SN2700-D48C8. - How I did it Regarding buffer settings, originally, there are two lossless PGs and queues 3, 4. In dual ToR scenario, the lossless traffic from the leaf switch to the uplink of the ToR switch can be bounced back. To avoid PFC deadlock, we need to map the bounce-back lossless traffic to different PGs and queues. Therefore, 2 additional lossless PGs and queues are allocated on uplink ports on ToR switches. On uplink ports, map DSCP 2/6 to TC 2/6 respectively On downlink ports, both DSCP 2/6 are still mapped to TC 1 Buffer adjusted according to the ports information: Mellanox-SN4600c-C64: 56 downlinks 50G + 8 uplinks 100G Mellanox-SN4600c-D48C40, Mellanox-SN2700, Mellanox-SN2700-D48C8: 24 downlinks 50G + 8 uplinks 100G - How to verify it Unit test. Signed-off-by: Stephen Sun <[email protected]>
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Original PR: #12605 |
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