IB/sa: Make sure SA queries use default P_Key

MADs sent to the SA should use the the default P_Key (0x7fff/0xffff).
There's no requirement that the default P_Key is stored at index 0 in
the local P_Key table, so add code to the sa_query module to look up
the index of the default P_Key when creating an address handle for the
SA (which is done any time the P_Key table might change), and use this
index for all SA queries.
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/sa_query.c

@@ -56,6 +56,7 @@ MODULE_LICENSE("Dual BSD/GPL");
 struct ib_sa_sm_ah {
 	struct ib_ah        *ah;
 	struct kref          ref;
+	u16		     pkey_index;
 	u8		     src_path_mask;
 };
 
@@ -382,6 +383,13 @@ static void update_sm_ah(struct work_struct *work)
 	kref_init(&new_ah->ref);
 	new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
 
+	new_ah->pkey_index = 0;
+	if (ib_find_pkey(port->agent->device, port->port_num,
+			 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index) &&
+	    ib_find_pkey(port->agent->device, port->port_num,
+			 IB_DEFAULT_PKEY_PARTIAL, &new_ah->pkey_index))
+		printk(KERN_ERR "Couldn't find index for default PKey\n");
+
 	memset(&ah_attr, 0, sizeof ah_attr);
 	ah_attr.dlid     = port_attr.sm_lid;
 	ah_attr.sl       = port_attr.sm_sl;
@@ -512,6 +520,35 @@ int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
 }
 EXPORT_SYMBOL(ib_init_ah_from_path);
 
+static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&query->port->ah_lock, flags);
+	kref_get(&query->port->sm_ah->ref);
+	query->sm_ah = query->port->sm_ah;
+	spin_unlock_irqrestore(&query->port->ah_lock, flags);
+
+	query->mad_buf = ib_create_send_mad(query->port->agent, 1,
+					    query->sm_ah->pkey_index,
+					    0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
+					    gfp_mask);
+	if (!query->mad_buf) {
+		kref_put(&query->sm_ah->ref, free_sm_ah);
+		return -ENOMEM;
+	}
+
+	query->mad_buf->ah = query->sm_ah->ah;
+
+	return 0;
+}
+
+static void free_mad(struct ib_sa_query *query)
+{
+	ib_free_send_mad(query->mad_buf);
+	kref_put(&query->sm_ah->ref, free_sm_ah);
+}
+
 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
 {
 	unsigned long flags;
@@ -548,20 +585,11 @@ static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
 	query->mad_buf->context[0] = query;
 	query->id = id;
 
-	spin_lock_irqsave(&query->port->ah_lock, flags);
-	kref_get(&query->port->sm_ah->ref);
-	query->sm_ah = query->port->sm_ah;
-	spin_unlock_irqrestore(&query->port->ah_lock, flags);
-
-	query->mad_buf->ah = query->sm_ah->ah;
-
 	ret = ib_post_send_mad(query->mad_buf, NULL);
 	if (ret) {
 		spin_lock_irqsave(&idr_lock, flags);
 		idr_remove(&query_idr, id);
 		spin_unlock_irqrestore(&idr_lock, flags);
-
-		kref_put(&query->sm_ah->ref, free_sm_ah);
 	}
 
 	/*
@@ -647,13 +675,10 @@ int ib_sa_path_rec_get(struct ib_sa_client *client,
 	if (!query)
 		return -ENOMEM;
 
-	query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
-						     0, IB_MGMT_SA_HDR,
-						     IB_MGMT_SA_DATA, gfp_mask);
-	if (!query->sa_query.mad_buf) {
-		ret = -ENOMEM;
+	query->sa_query.port     = port;
+	ret = alloc_mad(&query->sa_query, gfp_mask);
+	if (ret)
 		goto err1;
-	}
 
 	ib_sa_client_get(client);
 	query->sa_query.client = client;
@@ -665,7 +690,6 @@ int ib_sa_path_rec_get(struct ib_sa_client *client,
 
 	query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
 	query->sa_query.release  = ib_sa_path_rec_release;
-	query->sa_query.port     = port;
 	mad->mad_hdr.method	 = IB_MGMT_METHOD_GET;
 	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_PATH_REC);
 	mad->sa_hdr.comp_mask	 = comp_mask;
@@ -683,7 +707,7 @@ int ib_sa_path_rec_get(struct ib_sa_client *client,
 err2:
 	*sa_query = NULL;
 	ib_sa_client_put(query->sa_query.client);
-	ib_free_send_mad(query->sa_query.mad_buf);
+	free_mad(&query->sa_query);
 
 err1:
 	kfree(query);
@@ -773,13 +797,10 @@ int ib_sa_service_rec_query(struct ib_sa_client *client,
 	if (!query)
 		return -ENOMEM;
 
-	query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
-						     0, IB_MGMT_SA_HDR,
-						     IB_MGMT_SA_DATA, gfp_mask);
-	if (!query->sa_query.mad_buf) {
-		ret = -ENOMEM;
+	query->sa_query.port     = port;
+	ret = alloc_mad(&query->sa_query, gfp_mask);
+	if (ret)
 		goto err1;
-	}
 
 	ib_sa_client_get(client);
 	query->sa_query.client = client;
@@ -791,7 +812,6 @@ int ib_sa_service_rec_query(struct ib_sa_client *client,
 
 	query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
 	query->sa_query.release  = ib_sa_service_rec_release;
-	query->sa_query.port     = port;
 	mad->mad_hdr.method	 = method;
 	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
 	mad->sa_hdr.comp_mask	 = comp_mask;
@@ -810,7 +830,7 @@ int ib_sa_service_rec_query(struct ib_sa_client *client,
 err2:
 	*sa_query = NULL;
 	ib_sa_client_put(query->sa_query.client);
-	ib_free_send_mad(query->sa_query.mad_buf);
+	free_mad(&query->sa_query);
 
 err1:
 	kfree(query);
@@ -869,13 +889,10 @@ int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
 	if (!query)
 		return -ENOMEM;
 
-	query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
-						     0, IB_MGMT_SA_HDR,
-						     IB_MGMT_SA_DATA, gfp_mask);
-	if (!query->sa_query.mad_buf) {
-		ret = -ENOMEM;
+	query->sa_query.port     = port;
+	ret = alloc_mad(&query->sa_query, gfp_mask);
+	if (ret)
 		goto err1;
-	}
 
 	ib_sa_client_get(client);
 	query->sa_query.client = client;
@@ -887,7 +904,6 @@ int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
 
 	query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
 	query->sa_query.release  = ib_sa_mcmember_rec_release;
-	query->sa_query.port     = port;
 	mad->mad_hdr.method	 = method;
 	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
 	mad->sa_hdr.comp_mask	 = comp_mask;
@@ -906,7 +922,7 @@ int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
 err2:
 	*sa_query = NULL;
 	ib_sa_client_put(query->sa_query.client);
-	ib_free_send_mad(query->sa_query.mad_buf);
+	free_mad(&query->sa_query);
 
 err1:
 	kfree(query);
@@ -939,8 +955,7 @@ static void send_handler(struct ib_mad_agent *agent,
 	idr_remove(&query_idr, query->id);
 	spin_unlock_irqrestore(&idr_lock, flags);
 
-	ib_free_send_mad(mad_send_wc->send_buf);
-	kref_put(&query->sm_ah->ref, free_sm_ah);
+	free_mad(query);
 	ib_sa_client_put(query->client);
 	query->release(query);
 }

include/rdma/ib_mad.h

@@ -111,6 +111,9 @@
 #define IB_QP1_QKEY	0x80010000
 #define IB_QP_SET_QKEY	0x80000000
 
+#define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
+#define IB_DEFAULT_PKEY_FULL	0xFFFF
+
 enum {
 	IB_MGMT_MAD_HDR = 24,
 	IB_MGMT_MAD_DATA = 232,