git: a426ae1e411e - stable/15 - divert: Use a better source identifier for netisr_queue_src() calls

The branch stable/15 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=a426ae1e411ee315682964dc1a423eb023f7341d

commit a426ae1e411ee315682964dc1a423eb023f7341d
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-02-26 20:25:35 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-03-31 15:57:29 +0000

    divert: Use a better source identifier for netisr_queue_src() calls
    
    These opaque IDs are used by netisr to distribute work among threads.
    The mapping function is simply SourceID % numthreads, so using socket
    addresses as source IDs isn't going to distribute packets well due to
    alignment.
    
    Use the divert socket's generation number instead, as that suits this
    purpose much better.
    
    Reviewed by:    zlei, glebius
    MFC after:      1 week
    Sponsored by:   OPNsense
    Sponsored by:   Klara, Inc.
    Differential Revision:  https://reviews.freebsd.org/D55537
    
    (cherry picked from commit 5547a7bb39accd8f151b53e90b41d13b55f84c95)
---
 sys/netinet/ip_divert.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/netinet/ip_divert.c b/sys/netinet/ip_divert.c
index f98a599e7554..75371c7dacb3 100644
--- a/sys/netinet/ip_divert.c
+++ b/sys/netinet/ip_divert.c
@@ -503,8 +503,10 @@ static int
 div_output_inbound(int family, struct socket *so, struct mbuf *m,
     struct sockaddr_in *sin)
 {
+	struct divcb *dcb;
 	struct ifaddr *ifa;
 
+	dcb = so->so_pcb;
 	if (m->m_pkthdr.rcvif == NULL) {
 		/*
 		 * No luck with the name, check by IP address.
@@ -541,14 +543,14 @@ div_output_inbound(int family, struct socket *so, struct mbuf *m,
 			m->m_flags |= M_MCAST;
 		else if (in_ifnet_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
 			m->m_flags |= M_BCAST;
-		netisr_queue_src(NETISR_IP, (uintptr_t)so, m);
+		netisr_queue_src(NETISR_IP, (uintptr_t)dcb->dcb_gencnt, m);
 		DIVSTAT_INC(inbound);
 		break;
 	    }
 #endif
 #ifdef INET6
 	case AF_INET6:
-		netisr_queue_src(NETISR_IPV6, (uintptr_t)so, m);
+		netisr_queue_src(NETISR_IPV6, (uintptr_t)dcb->dcb_gencnt, m);
 		DIVSTAT_INC(inbound);
 		break;
 #endif