[0/3] pipeline: extend the IPv6 support

  So far, the pipeline supports the following operations on IPv6 addresses:
-using an IPv6 address as a table match field of exact/ternary/LPM match type
-assignment of IPv6 address to another IPv6 address
-conversion between an IPv4 address and an IPv6 address

The reason for this limited support is the fact that CPUs have 64-bit registers,
so supporting operations on 128-bit variables requires additional logic.

We are now adding support for the following operations involving IPv6 addresses:
-logic operations: AND, OR, XOR
-shift left/right
-equality/inequality tests

The way we do this is by introducing a new instruction (called "movh") to read
and write the upper half of a 128-bit operand and optimizing the existing
instruction (called "mov"). This way, we can split an IPv6 address into its
upper half and lower half and use the existing 64-bit instructions to handle the
required operations.

We are still not supporting the following operations on IPv6 addresses, as they
seem of very little practical use: addition, subtraction, multiplication and
division.

Cristian Dumitrescu (3):
  pipeline: add new instruction for upper half of IPv6 address
  pipeline: optimize conversion between IPv4 and IPv6 addresses
  examples/pipeline: add example for IPv6 address swap

 examples/pipeline/examples/ipv6_addr_swap.cli |  35 ++++
 .../pipeline/examples/ipv6_addr_swap.spec     |  83 ++++++++++
 lib/pipeline/rte_swx_pipeline.c               | 155 ++++++++++++++++++
 lib/pipeline/rte_swx_pipeline_internal.h      | 104 +++++++++++-
 4 files changed, 373 insertions(+), 4 deletions(-)
 create mode 100644 examples/pipeline/examples/ipv6_addr_swap.cli
 create mode 100644 examples/pipeline/examples/ipv6_addr_swap.spec
  

13/02/2024 17:57, Cristian Dumitrescu:
> So far, the pipeline supports the following operations on IPv6 addresses:
> -using an IPv6 address as a table match field of exact/ternary/LPM match type
> -assignment of IPv6 address to another IPv6 address
> -conversion between an IPv4 address and an IPv6 address
> 
> The reason for this limited support is the fact that CPUs have 64-bit registers,
> so supporting operations on 128-bit variables requires additional logic.
> 
> We are now adding support for the following operations involving IPv6 addresses:
> -logic operations: AND, OR, XOR
> -shift left/right
> -equality/inequality tests
> 
> The way we do this is by introducing a new instruction (called "movh") to read
> and write the upper half of a 128-bit operand and optimizing the existing
> instruction (called "mov"). This way, we can split an IPv6 address into its
> upper half and lower half and use the existing 64-bit instructions to handle the
> required operations.
> 
> We are still not supporting the following operations on IPv6 addresses, as they
> seem of very little practical use: addition, subtraction, multiplication and
> division.
> 
> Cristian Dumitrescu (3):
>   pipeline: add new instruction for upper half of IPv6 address
>   pipeline: optimize conversion between IPv4 and IPv6 addresses
>   examples/pipeline: add example for IPv6 address swap

Applied, thanks.