[PATCH 0/2] fib: fix and speed up RVV lookup

[Sun Yuechi <sunyuechi@iscas.ac.cn>]

Patch 1 fixes wrong next hops from a FIB created with
RTE_FIB_F_LOOKUP_NETWORK_ORDER on RISC-V: the vector lookup read the
addresses in host order.

Patch 2 removes a register spill from the vector lookup loop by
gathering the entries at the width they are stored with.

Patch 2, ns per lookup, standalone benchmark, tables in cache, -O3:

                    1B     2B     4B     8B
  SpacemiT X60
    before         31.1   32.1   30.6   29.7
    after          27.2   27.9   27.6   26.4
  Sophgo SG2044
    before          5.6    5.7    5.9    7.5
    after           4.4    4.1    5.0    6.0
  SpacemiT X100
    before          4.7    4.8    4.8    5.9
    after           4.1    4.2    4.3    5.1

fib_perf_autotest, whose addresses miss the cache, gains 0 to 14%.

Sun Yuechi (2):
  fib: fix lookup in network order with RVV
  fib: gather entries at their own width with RVV

 lib/fib/dir24_8.c     |  4 +-
 lib/fib/dir24_8_rvv.c | 85 ++++++++++++++++++++++++-------------------
 2 files changed, 49 insertions(+), 40 deletions(-)

-- 
2.56.0