git: e6f9f493a827 - stable/14 - if_tuntap: Enable MEXTPG support

The branch stable/14 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=e6f9f493a827bb900e324d6790ea0ff465018ee3

commit e6f9f493a827bb900e324d6790ea0ff465018ee3
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2024-10-28 13:52:14 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2024-11-11 14:02:30 +0000

    if_tuntap: Enable MEXTPG support
    
    Fix tunread() to use m_mbuftouio() instead of manually copying (which
    doesn't work for unmapped mbufs).
    
    Reviewed by:    jhb, gallatin
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D47295
    
    (cherry picked from commit 01c738cd5c3938374cce8293c82753d977966154)
---
 sys/net/if_tuntap.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c
index 54d1908b078c..0dee2260973d 100644
--- a/sys/net/if_tuntap.c
+++ b/sys/net/if_tuntap.c
@@ -976,11 +976,11 @@ tuncreate(struct cdev *dev)
 	ifp->if_ioctl = tunifioctl;
 	ifp->if_flags = iflags;
 	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
-	ifp->if_capabilities |= IFCAP_LINKSTATE;
+	ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_MEXTPG;
 	if ((tp->tun_flags & TUN_L2) != 0)
 		ifp->if_capabilities |=
 		    IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO;
-	ifp->if_capenable |= IFCAP_LINKSTATE;
+	ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_MEXTPG;
 
 	if ((tp->tun_flags & TUN_L2) != 0) {
 		ifp->if_init = tunifinit;
@@ -1760,18 +1760,9 @@ tunread(struct cdev *dev, struct uio *uio, int flag)
 		    vhdr.hdr.csum_offset);
 		error = uiomove(&vhdr, len, uio);
 	}
-
-	while (m && uio->uio_resid > 0 && error == 0) {
-		len = min(uio->uio_resid, m->m_len);
-		if (len != 0)
-			error = uiomove(mtod(m, void *), len, uio);
-		m = m_free(m);
-	}
-
-	if (m) {
-		TUNDEBUG(ifp, "Dropping mbuf\n");
-		m_freem(m);
-	}
+	if (error == 0)
+		error = m_mbuftouio(uio, m, 0);
+	m_freem(m);
 	return (error);
 }