iflib: actually disable simple_tx when ALTQ is in use

When getting some baseline ALTQ numbers, I noticed that
if simlple_tx is enabled in kenv, we wind up re-setting the transmit
routine, but I neglected to actually clear ctx->ifc_sysctl_simple_tx.
That leads to many different panics as we run a mixture of mp_ring
and simple_tx.

Pointy-hat to: gallatin
Sponsored by: Netflix

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/net/iflib.c b/sys/net/iflib.c
index d4e23a70d569..c8662b6b7e69 100644
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -5285,6 +5285,7 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct
 		device_printf(dev, "using simple if_transmit\n");
 #else
 		device_printf(dev, "ALTQ prevents using simple if_transmit\n");
+		ctx->ifc_sysctl_simple_tx = 0;
 #endif
 	}
 	iflib_reset_qvalues(ctx);