IPoIB: P_Key change event handling

This patch causes the network interface to respond to P_Key change
events correctly.  As a result, you'll see a child interface in the
"RUNNING" state (netif_carrier_on()) only when the corresponding P_Key
is configured by the SM.  When SM removes a P_Key, the "RUNNING" state
will be disabled for the corresponding network interface.  To
implement this, I added IB_EVENT_PKEY_CHANGE event handling.  To
prevent flushing the device before the device is open by the "delay
open" mechanism, I added an additional device flag called
IPOIB_FLAG_INITIALIZED.

This also prevents the child network interface from trying to join to
multicast groups until the PKEY is configured.  We used to get error
messages like:

    ib0.f2f2: couldn't attach QP to multicast group ff12:401b:f2f2:0:0:0:ffff:ffff

in this case.  To fix this, I just check IPOIB_FLAG_OPER_UP flag in
ipoib_set_mcast_list().

Signed-off-by: Leonid Arsh <leonida@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 1251f86ec856..b640107fb732 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -72,13 +72,14 @@ enum {
         IPOIB_MAX_MCAST_QUEUE     = 3,
 
         IPOIB_FLAG_OPER_UP        = 0,
-        IPOIB_FLAG_ADMIN_UP       = 1,
-        IPOIB_PKEY_ASSIGNED       = 2,
-        IPOIB_PKEY_STOP           = 3,
-        IPOIB_FLAG_SUBINTERFACE   = 4,
-        IPOIB_MCAST_RUN           = 5,
-        IPOIB_STOP_REAPER         = 6,
-        IPOIB_MCAST_STARTED       = 7,
+        IPOIB_FLAG_INITIALIZED    = 1,
+        IPOIB_FLAG_ADMIN_UP       = 2,
+        IPOIB_PKEY_ASSIGNED       = 3,
+        IPOIB_PKEY_STOP           = 4,
+        IPOIB_FLAG_SUBINTERFACE   = 5,
+        IPOIB_MCAST_RUN           = 6,
+        IPOIB_STOP_REAPER         = 7,
+        IPOIB_MCAST_STARTED       = 8,
 
         IPOIB_MAX_BACKOFF_SECONDS = 16,