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riscv: Add fine-tuned checksum functions #380

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wants to merge 6 commits into from
Closed

riscv: Add fine-tuned checksum functions #380

wants to merge 6 commits into from

Commits on Jan 12, 2024

  1. adding ci files

    Björn Töpel committed Jan 12, 2024
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  2. asm-generic: Improve csum_fold 

    This csum_fold implementation introduced into arch/arc by Vineet Gupta
is better than the default implementation on at least arc, x86, and
riscv. Using GCC trunk and compiling non-inlined version, this
implementation has 41.6667%, 25% fewer instructions on riscv64, x86-64
respectively with -O3 optimization. Most implmentations override this
default in asm, but this should be more performant than all of those
other implementations except for arm which has barrel shifting and
sparc32 which has a carry flag.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: David Laight <david.laight@aculab.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @charlie-rivos
    charlie-rivos authored and Björn Töpel committed Jan 12, 2024
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  3. riscv: Add static key for misaligned accesses 

    Support static branches depending on the value of misaligned accesses.
This will be used by a later patch in the series. At any point in time,
this static branch will only be enabled if all online CPUs are
considered "fast".

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @charlie-rivos
    charlie-rivos authored and Björn Töpel committed Jan 12, 2024
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  4. riscv: Add checksum header 

    Provide checksum algorithms that have been designed to leverage riscv
instructions such as rotate. In 64-bit, can take advantage of the larger
register to avoid some overflow checking.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Xiao Wang <xiao.w.wang@intel.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @charlie-rivos
    charlie-rivos authored and Björn Töpel committed Jan 12, 2024
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  5. riscv: Add checksum library 

    Provide a 32 and 64 bit version of do_csum. When compiled for 32-bit
will load from the buffer in groups of 32 bits, and when compiled for
64-bit will load in groups of 64 bits.

Additionally provide riscv optimized implementation of csum_ipv6_magic.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Xiao Wang <xiao.w.wang@intel.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @charlie-rivos
    charlie-rivos authored and Björn Töpel committed Jan 12, 2024
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  6. kunit: Add tests for csum_ipv6_magic and ip_fast_csum 

    Supplement existing checksum tests with tests for csum_ipv6_magic and
ip_fast_csum.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @charlie-rivos
    charlie-rivos authored and Björn Töpel committed Jan 12, 2024
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