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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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042a41977b
Santosh Shilimkar says: ==================== rds: add tos support RDS applications make use of tos to classify database traffic. This feature has been used in shipping products from 2.6.32 based kernels. Its tied with RDS v4.1 protocol version and the compatibility gets negotiated as part of connections setup. Patchset keeps full backward compatibility using existing connection negotiation scheme. Currently the feature is exploited by RDMA transport and for TCP transport the user tos values are mapped to same default class (0). For RDMA transports, RDMA CM service type API is used to set up different SL(service lanes) and the IB fabric is configured for tos mapping using Subnet Manager(SL to VL mappings). Similarly for ROCE fabric, user priority is mapped with different DSCP code points which are associated with different switch queues in the fabric. The original code was developed by Bang Nguyen in downstream kernel back in 2.6.32 kernel days and it has evolved significantly over period of time. Thanks to Yanjun for doing testing with various combinations of host like v3.1<->v4.1, v4.1.<->v3.1, v4.1 upstream to shipping v4.1 etc etc ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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