From ac1cd655f647cfd8e8d8c08da00f41abfce212a1 Mon Sep 17 00:00:00 2001 From: Andrew Gallatin Date: Mon, 5 Jan 2026 12:02:23 -0500 Subject: [PATCH] ixl: verify flowid is valid before setting rsstype & flowid According to section 8.3.2.2.1 of the XL710 datasheet, FLTSTAT indicates if RSS hashing was used (or flow director or nothing) to arrive at the flowid it is reporting. We need to check this before reporting the flowid and setting the rss type. Not checking this allows invalid flowids (0s) to be reported for some TCP traffic (it seems to mostly impact incoming connections). This leads to the inp flowid being 0, and egress traffic being unbalanced (going to tx queue 0, and NIC 0 of an lacp bundle). Differential Revision: https://reviews.freebsd.org/D54442 Reviewed by: adrian, kbowling Sponsored by: Netflix MFC after: 2 weeks --- sys/dev/ixl/ixl_txrx.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/sys/dev/ixl/ixl_txrx.c b/sys/dev/ixl/ixl_txrx.c index f971a3073265..04b8279bdc59 100644 --- a/sys/dev/ixl/ixl_txrx.c +++ b/sys/dev/ixl/ixl_txrx.c @@ -661,7 +661,7 @@ ixl_isc_rxd_pkt_get(void *arg, if_rxd_info_t ri) struct ixl_rx_queue *que = &vsi->rx_queues[ri->iri_qsidx]; struct rx_ring *rxr = &que->rxr; union i40e_rx_desc *cur; - u32 status, error; + u32 status, error, fltstat; u16 plen; u64 qword; u8 ptype; @@ -717,8 +717,12 @@ ixl_isc_rxd_pkt_get(void *arg, if_rxd_info_t ri) if ((scctx->isc_capenable & IFCAP_RXCSUM) != 0) rxr->csum_errs += ixl_rx_checksum(ri, status, error, ptype); - ri->iri_flowid = le32toh(cur->wb.qword0.hi_dword.rss); - ri->iri_rsstype = ixl_ptype_to_hash(ptype); + fltstat = (status >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT); + if ((fltstat & I40E_RX_DESC_FLTSTAT_RSS_HASH) == + I40E_RX_DESC_FLTSTAT_RSS_HASH) { + ri->iri_flowid = le32toh(cur->wb.qword0.hi_dword.rss); + ri->iri_rsstype = ixl_ptype_to_hash(ptype); + } if (status & (1 << I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)) { ri->iri_vtag = le16toh(cur->wb.qword0.lo_dword.l2tag1); ri->iri_flags |= M_VLANTAG;