git: 9ac59d42c0b4 - main - netmap: vtnet: stop krings during interface reset

[Vincenzo Maffione]

The branch main has been updated by vmaffione:

URL: https://cgit.FreeBSD.org/src/commit/?id=9ac59d42c0b4b6cd9c36a5dace7f49753c2e175a

commit 9ac59d42c0b4b6cd9c36a5dace7f49753c2e175a
Author:     Vincenzo Maffione <vmaffione at FreeBSD.org>
AuthorDate: 2021-01-09 22:34:10 +0000
Commit:     Vincenzo Maffione <vmaffione at FreeBSD.org>
CommitDate: 2021-01-09 22:34:52 +0000

    netmap: vtnet: stop krings during interface reset
    
    Similarly to what done for iflib in 1d238b07d5d4d9660ae0e,
    this patch prevents access to the krings during the interface
    reset triggered by netmap_register().
    
    MFC after:      1 week
---
 sys/dev/netmap/if_vtnet_netmap.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sys/dev/netmap/if_vtnet_netmap.h b/sys/dev/netmap/if_vtnet_netmap.h
index 0f686ed60788..a44cc13baae2 100644
--- a/sys/dev/netmap/if_vtnet_netmap.h
+++ b/sys/dev/netmap/if_vtnet_netmap.h
@@ -40,6 +40,9 @@ vtnet_netmap_reg(struct netmap_adapter *na, int state)
 	struct ifnet *ifp = na->ifp;
 	struct vtnet_softc *sc = ifp->if_softc;
 
+	/* Stop all txsync/rxsync and disable them. */
+	netmap_disable_all_rings(ifp);
+
 	/*
 	 * Trigger a device reinit, asking vtnet_init_locked() to
 	 * also enter or exit netmap mode.
@@ -50,7 +53,10 @@ vtnet_netmap_reg(struct netmap_adapter *na, int state)
 	    : VTNET_INIT_NETMAP_EXIT);
 	VTNET_CORE_UNLOCK(sc);
 
-	return 0;
+	/* Enable txsync/rxsync again. */
+	netmap_enable_all_rings(ifp);
+
+	return (0);
 }