RE: [PATCH 1/4] net/i40e: fix AVX-512 pointer copy on 32-bit

["Stokes, Ian" <ian.stokes@intel.com>]

> The size of a pointer on 32-bit is only 4 rather than 8 bytes, so
> copying 32 pointers only requires half the number of AVX-512 load store
> operations.
>
> Fixes: 5171b4ee6b6b ("net/i40e: optimize Tx by using AVX512")
> Cc: stable@dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
>  drivers/net/i40e/i40e_rxtx_vec_avx512.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_rxtx_vec_avx512.c
> b/drivers/net/i40e/i40e_rxtx_vec_avx512.c
> index 0238b03f8a..3b2750221b 100644
> --- a/drivers/net/i40e/i40e_rxtx_vec_avx512.c
> +++ b/drivers/net/i40e/i40e_rxtx_vec_avx512.c
> @@ -799,6 +799,7 @@ i40e_tx_free_bufs_avx512(struct i40e_tx_queue *txq)
>               uint32_t copied = 0;
>               /* n is multiple of 32 */
>               while (copied < n) {
> +#ifdef RTE_ARCH_64
>                       const __m512i a = _mm512_load_si512(&txep[copied]);
>                       const __m512i b = _mm512_load_si512(&txep[copied +
> 8]);
>                       const __m512i c = _mm512_load_si512(&txep[copied +
> 16]);
> @@ -808,6 +809,12 @@ i40e_tx_free_bufs_avx512(struct i40e_tx_queue *txq)
>                       _mm512_storeu_si512(&cache_objs[copied + 8], b);
>                       _mm512_storeu_si512(&cache_objs[copied + 16], c);
>                       _mm512_storeu_si512(&cache_objs[copied + 24], d);
> +#else
> +                     const __m512i a = _mm512_load_si512(&txep[copied]);
> +                     const __m512i b = _mm512_load_si512(&txep[copied +
> 16]);
> +                     _mm512_storeu_si512(&cache_objs[copied], a);
> +                     _mm512_storeu_si512(&cache_objs[copied + 16], b);
> +#endif
>                       copied += 32;
>               }
>               cache->len += n;
> --
> 2.43.0

Looks good to me, ACKED.

Thanks
Ian