[src/trunk]: src/sys/dev/pci port-arm/55532: kernel panic with ena on AWS a1....

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1e882ce4307f
branches:  trunk
changeset: 936981:1e882ce4307f
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Mon Aug 03 19:44:06 2020 +0000

description:
port-arm/55532: kernel panic with ena on AWS a1.2xlarge

Do not mark callout and workqueues as mpsafe unless the NET_MPSAFE option
is present.

diffstat:

 sys/dev/pci/if_ena.c |  23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

diffs (69 lines):

diff -r bb14025bf8a1 -r 1e882ce4307f sys/dev/pci/if_ena.c
--- a/sys/dev/pci/if_ena.c      Mon Aug 03 19:24:28 2020 +0000
+++ b/sys/dev/pci/if_ena.c      Mon Aug 03 19:44:06 2020 +0000
@@ -27,11 +27,16 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
+#ifdef _KERNEL_OPT
+#include "opt_net_mpsafe.h"
+#endif
+
 #include <sys/cdefs.h>
 #if 0
 __FBSDID("$FreeBSD: head/sys/dev/ena/ena.c 333456 2018-05-10 09:37:54Z mw $");
 #endif
-__KERNEL_RCSID(0, "$NetBSD: if_ena.c,v 1.24 2020/03/03 21:42:31 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ena.c,v 1.25 2020/08/03 19:44:06 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -56,6 +61,14 @@
 
 #include <dev/pci/if_enavar.h>
 
+#ifdef NET_MPSAFE
+#define        WQ_FLAGS        WQ_MPSAFE
+#define        CALLOUT_FLAGS   CALLOUT_MPSAFE
+#else
+#define        WQ_FLAGS        0
+#define        CALLOUT_FLAGS   0
+#endif
+
 /*********************************************************
  *  Function prototypes
  *********************************************************/
@@ -677,7 +690,7 @@
 
        /* Allocate workqueues */
        int rc = workqueue_create(&tx_ring->enqueue_tq, "ena_tx_enq",
-           ena_deferred_mq_start, tx_ring, 0, IPL_NET, WQ_PERCPU | WQ_MPSAFE);
+           ena_deferred_mq_start, tx_ring, 0, IPL_NET, WQ_PERCPU | WQ_FLAGS);
        if (unlikely(rc != 0)) {
                ena_trace(ENA_ALERT,
                    "Unable to create workqueue for enqueue task\n");
@@ -883,7 +896,7 @@
 
        /* Allocate workqueues */
        int rc = workqueue_create(&rx_ring->cmpl_tq, "ena_rx_comp",
-           ena_deferred_rx_cleanup, rx_ring, 0, IPL_NET, WQ_PERCPU | WQ_MPSAFE);
+           ena_deferred_rx_cleanup, rx_ring, 0, IPL_NET, WQ_PERCPU | WQ_FLAGS);
        if (unlikely(rc != 0)) {
                ena_trace(ENA_ALERT,
                    "Unable to create workqueue for RX completion task\n");
@@ -3795,12 +3808,12 @@
                goto err_ifp_free;
        }
 
-       callout_init(&adapter->timer_service, CALLOUT_MPSAFE);
+       callout_init(&adapter->timer_service, CALLOUT_FLAGS);
        callout_setfunc(&adapter->timer_service, ena_timer_service, adapter);
 
        /* Initialize reset task queue */
        rc = workqueue_create(&adapter->reset_tq, "ena_reset_enq",
-           ena_reset_task, adapter, 0, IPL_NET, WQ_PERCPU | WQ_MPSAFE);
+           ena_reset_task, adapter, 0, IPL_NET, WQ_PERCPU | WQ_FLAGS);
        if (unlikely(rc != 0)) {
                ena_trace(ENA_ALERT,
                    "Unable to create workqueue for reset task\n");