Hi, all
one question about 'rxm->hash.rss' and 'mb->hash.fdir'.
In Rx recv packets function,
'rxm->hash.rss' will report rss hash result from Rx desc.
'rxm->hash.fdir' will report filter identifier from Rx desc.
But function implementation differs from some PMDs. for example:
i40e, MLX5 report the two at the same time if pkt_flags is set,like:
******************************************
if (pkt_flags & PKT_RX_RSS_HASH) {
rxm->hash.rss =
rte_le_to_cpu_32(rxd.wb.qword0.hi_dword.rss);
}
if (pkt_flags & PKT_RX_FDIR) {
mb->hash.fdir.hi =
rte_le_to_cpu_32(rxdp->wb.qword3.hi_dword.fd_id);
}
********************************************
While, ixgbe only report one of the two. like:
******************************************
if (likely(pkt_flags & PKT_RX_RSS_HASH))
mb->hash.rss = rte_le_to_cpu_32(
rxdp[j].wb.lower.hi_dword.rss);
else if (pkt_flags & PKT_RX_FDIR) {
mb->hash.fdir.hash = rte_le_to_cpu_16(
rxdp[j].wb.lower.hi_dword.csum_ip.csum) &
IXGBE_ATR_HASH_MASK;
mb->hash.fdir.id = rte_le_to_cpu_16(
rxdp[j].wb.lower.hi_dword.csum_ip.ip_id);
}
********************************************
So, what is application scenario for 'rxm->hash.rss' and
'mb->hash.fdir', that is, why the two should be reported? How about
reporting the two at the same time?
Thanks for your reply.
