riscv: Add fine-tuned checksum functions #380
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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>
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>
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>
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>
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>
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Pull request for series with
subject: riscv: Add fine-tuned checksum functions
version: 12
url: https://patchwork.kernel.org/project/linux-riscv/list/?series=809482