IB/ehca: Notify consumers of LID/PKEY/SM changes after nondisruptive events

When firmware reports a nondisruptive port configuration change event,
previous versions of the eHCA driver didn't forward the event to consumers
like IPoIB.  Add code that determines the type of configuration change by
comparing old and new port attributes and reports it.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 58 insertions, 31 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index 02b73c84c49b..96eba3830754 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -61,6 +61,7 @@
 #define NEQE_EVENT_CODE        EHCA_BMASK_IBM(2,7)
 #define NEQE_PORT_NUMBER       EHCA_BMASK_IBM(8,15)
 #define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16,16)
+#define NEQE_DISRUPTIVE        EHCA_BMASK_IBM(16,16)
 
 #define ERROR_DATA_LENGTH      EHCA_BMASK_IBM(52,63)
 #define ERROR_DATA_TYPE        EHCA_BMASK_IBM(0,7)
@@ -286,30 +287,61 @@ static void parse_identifier(struct ehca_shca *shca, u64 eqe)
         return;
 }
 
-static void parse_ec(struct ehca_shca *shca, u64 eqe)
+static void dispatch_port_event(struct ehca_shca *shca, int port_num,
+                                enum ib_event_type type, const char *msg)
 {
         struct ib_event event;
+
+        ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
+        event.device = &shca->ib_device;
+        event.event = type;
+        event.element.port_num = port_num;
+        ib_dispatch_event(&event);
+}
+
+static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
+{
+        struct ehca_sma_attr  new_attr;
+        struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
+
+        ehca_query_sma_attr(shca, port_num, &new_attr);
+
+        if (new_attr.sm_sl  != old_attr->sm_sl ||
+            new_attr.sm_lid != old_attr->sm_lid)
+                dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE,
+                                    "SM changed");
+
+        if (new_attr.lid != old_attr->lid ||
+            new_attr.lmc != old_attr->lmc)
+                dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE,
+                                    "LID changed");
+
+        if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len ||
+            memcmp(new_attr.pkeys, old_attr->pkeys,
+                   sizeof(u16) * new_attr.pkey_tbl_len))
+                dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE,
+                                    "P_Key changed");
+
+        *old_attr = new_attr;
+}
+
+static void parse_ec(struct ehca_shca *shca, u64 eqe)
+{
         u8 ec   = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
         u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
 
         switch (ec) {
         case 0x30: /* port availability change */
                 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
-                        ehca_info(&shca->ib_device,
-                                  "port %x is active.", port);
-                        event.device = &shca->ib_device;
-                        event.event = IB_EVENT_PORT_ACTIVE;
-                        event.element.port_num = port;
                         shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
-                        ib_dispatch_event(&event);
+                        dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
+                                            "is active");
+                        ehca_query_sma_attr(shca, port,
+                                            &shca->sport[port - 1].saved_attr);
                 } else {
-                        ehca_info(&shca->ib_device,
-                                  "port %x is inactive.", port);
-                        event.device = &shca->ib_device;
-                        event.event = IB_EVENT_PORT_ERR;
-                        event.element.port_num = port;
                         shca->sport[port - 1].port_state = IB_PORT_DOWN;
-                        ib_dispatch_event(&event);
+                        dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
+                                            "is inactive");
                 }
                 break;
         case 0x31:
@@ -317,24 +349,19 @@ static void parse_ec(struct ehca_shca *shca, u64 eqe)
                  * disruptive change is caused by
                  * LID, PKEY or SM change
                  */
-                ehca_warn(&shca->ib_device,
-                          "disruptive port %x configuration change", port);
-
-                ehca_info(&shca->ib_device,
-                          "port %x is inactive.", port);
-                event.device = &shca->ib_device;
-                event.event = IB_EVENT_PORT_ERR;
-                event.element.port_num = port;
-                shca->sport[port - 1].port_state = IB_PORT_DOWN;
-                ib_dispatch_event(&event);
-
-                ehca_info(&shca->ib_device,
-                          "port %x is active.", port);
-                event.device = &shca->ib_device;
-                event.event = IB_EVENT_PORT_ACTIVE;
-                event.element.port_num = port;
-                shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
-                ib_dispatch_event(&event);
+                if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
+                        ehca_warn(&shca->ib_device, "disruptive port "
+                                  "%d configuration change", port);
+
+                        shca->sport[port - 1].port_state = IB_PORT_DOWN;
+                        dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
+                                            "is inactive");
+
+                        shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
+                        dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
+                                            "is active");
+                } else
+                        notify_port_conf_change(shca, port);
                 break;
         case 0x32: /* adapter malfunction */
                 ehca_err(&shca->ib_device, "Adapter malfunction.");