git: 410403d2e9ea - stable/15 - e1000: report UDP RSS hash type on igb/em

The branch stable/15 has been updated by olivier:

URL: https://cgit.FreeBSD.org/src/commit/?id=410403d2e9ea5152206d18271e54c717b8b1fcb1

commit 410403d2e9ea5152206d18271e54c717b8b1fcb1
Author:     Olivier Cochard <olivier@FreeBSD.org>
AuthorDate: 2026-07-28 19:13:53 +0000
Commit:     Olivier Cochard <olivier@FreeBSD.org>
CommitDate: 2026-08-04 09:33:05 +0000

    e1000: report UDP RSS hash type on igb/em
    
    {em,igb}_determine_rsstype() mapped only the TCP and bare-IP RSS descriptor
    types; the UDP types returned M_HASHTYPE_NONE.
    The hardware does hash UDP, but with a NONE hashtype iflib skips its
    flowid-based TX queue spread, so all forwarded UDP egressed on a single queue
    and serialized transmit on one core.
    
    Add the three UDP cases (IPV4_UDP, IPV6_UDP, IPV6_UDP_EX) so egress spreads
    across all TX queues.
    
    Reviewed by:    kbowling, gallatin
    Approved by:    kbowling
    MFC after:      1 week
    Sponsored by:   Netflix
    Differential Revision:  https://reviews.freebsd.org/D58513
    
    (cherry picked from commit 285c749f575ed7f9e60555037f23ac673084c62a)
---
 sys/dev/e1000/em_txrx.c  | 6 ++++++
 sys/dev/e1000/igb_txrx.c | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/sys/dev/e1000/em_txrx.c b/sys/dev/e1000/em_txrx.c
index 126364b00734..754f1a139065 100644
--- a/sys/dev/e1000/em_txrx.c
+++ b/sys/dev/e1000/em_txrx.c
@@ -858,6 +858,12 @@ em_determine_rsstype(uint32_t pkt_info)
 		return M_HASHTYPE_RSS_IPV6;
 	case E1000_RXDADV_RSSTYPE_IPV6_TCP_EX:
 		return M_HASHTYPE_RSS_TCP_IPV6_EX;
+	case E1000_RXDADV_RSSTYPE_IPV4_UDP:
+		return M_HASHTYPE_RSS_UDP_IPV4;
+	case E1000_RXDADV_RSSTYPE_IPV6_UDP:
+		return M_HASHTYPE_RSS_UDP_IPV6;
+	case E1000_RXDADV_RSSTYPE_IPV6_UDP_EX:
+		return M_HASHTYPE_RSS_UDP_IPV6_EX;
 	default:
 		return M_HASHTYPE_OPAQUE;
 	}
diff --git a/sys/dev/e1000/igb_txrx.c b/sys/dev/e1000/igb_txrx.c
index c34bf3874e02..6f13348bdb3e 100644
--- a/sys/dev/e1000/igb_txrx.c
+++ b/sys/dev/e1000/igb_txrx.c
@@ -593,6 +593,12 @@ igb_determine_rsstype(uint16_t pkt_info)
 		return M_HASHTYPE_RSS_IPV6;
 	case E1000_RXDADV_RSSTYPE_IPV6_TCP_EX:
 		return M_HASHTYPE_RSS_TCP_IPV6_EX;
+	case E1000_RXDADV_RSSTYPE_IPV4_UDP:
+		return M_HASHTYPE_RSS_UDP_IPV4;
+	case E1000_RXDADV_RSSTYPE_IPV6_UDP:
+		return M_HASHTYPE_RSS_UDP_IPV6;
+	case E1000_RXDADV_RSSTYPE_IPV6_UDP_EX:
+		return M_HASHTYPE_RSS_UDP_IPV6_EX;
 	default:
 		return M_HASHTYPE_OPAQUE;
 	}