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Author	SHA1	Message	Date
Bjorn Svensson	ac874c2c83	[core] Add a channel argument to set DSCP on streams (#28322 ) This adds a new channel argument `GRPC_ARG_DSCP` which allows users to create classified gRPC streams with a Differentiated Services Code Point (DSCP) marking on the IP frames. The channel argument is handled on both clients and servers, but currently only on posix based systems. Fixes #17225 Background: In addition to what is already described is #17225, when gRPC is used in telco systems there is often a need to classify streams of importance. There can be multiple hops between two endpoints (e.g. between 2 telecom operators) and some streams that are more important than others (e.g. emergency call related or similar). By marking the IP packets using DSCP the aware routers can make a sound decision of the prioritization. This PR propose to use DSCP as the configuration value since its common for both IPv4/IPv6, an alternative would be to use a config name that includes TOS and Traffic Class. There might be more needed regarding documentation and end2end testing, but there I need some advice. References https://datatracker.ietf.org/doc/html/rfc2474 https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml <!-- Your pull request will be routed to the following person by default for triaging. If you know who should review your pull request, please remove the mentioning below. --> @yashykt	1 year ago

Author

SHA1

Message

Date

Bjorn Svensson

ac874c2c83

[core] Add a channel argument to set DSCP on streams (#28322 )

This adds a new channel argument `GRPC_ARG_DSCP` which allows users to
create classified gRPC streams with a
Differentiated Services Code Point (DSCP) marking on the IP frames.

The channel argument is handled on both clients and servers, but
currently only on posix based systems.

Fixes #17225

**Background**:
In addition to what is already described is #17225, when gRPC is used in
telco systems there is often a need to classify streams of importance.
There can be multiple hops between two endpoints (e.g. between 2 telecom
operators) and some streams that are more important than others (e.g.
emergency call related or similar). By marking the IP packets using DSCP
the aware routers can make a sound decision of the prioritization.

This PR propose to use DSCP as the configuration value since its common
for both IPv4/IPv6, an alternative would be to use a config name that
includes TOS and Traffic Class.
There might be more needed regarding documentation and end2end testing,
but there I need some advice.

**References**
https://datatracker.ietf.org/doc/html/rfc2474
https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml

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@yashykt

1 year ago

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