RDMA/cma: Constify path record, ib_cm_event, listen_id pointers

Constify several pointers such as path_rec, ib_cm_event and listen_id
pointers in several functions.
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/cma.c

@@ -641,7 +641,7 @@ static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 }
 
 static int cma_acquire_dev(struct rdma_id_private *id_priv,
-			   struct rdma_id_private *listen_id_priv)
+			   const struct rdma_id_private *listen_id_priv)
 {
 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 	const struct ib_gid_attr *sgid_attr;
@@ -1122,8 +1122,8 @@ static inline int cma_any_port(const struct sockaddr *addr)
 
 static void cma_save_ib_info(struct sockaddr *src_addr,
 			     struct sockaddr *dst_addr,
-			     struct rdma_cm_id *listen_id,
-			     struct sa_path_rec *path)
+			     const struct rdma_cm_id *listen_id,
+			     const struct sa_path_rec *path)
 {
 	struct sockaddr_ib *listen_ib, *ib;
 
@@ -1208,7 +1208,7 @@ static u16 cma_port_from_service_id(__be64 service_id)
 
 static int cma_save_ip_info(struct sockaddr *src_addr,
 			    struct sockaddr *dst_addr,
-			    struct ib_cm_event *ib_event,
+			    const struct ib_cm_event *ib_event,
 			    __be64 service_id)
 {
 	struct cma_hdr *hdr;
@@ -1238,8 +1238,8 @@ static int cma_save_ip_info(struct sockaddr *src_addr,
 
 static int cma_save_net_info(struct sockaddr *src_addr,
 			     struct sockaddr *dst_addr,
-			     struct rdma_cm_id *listen_id,
-			     struct ib_cm_event *ib_event,
+			     const struct rdma_cm_id *listen_id,
+			     const struct ib_cm_event *ib_event,
 			     sa_family_t sa_family, __be64 service_id)
 {
 	if (sa_family == AF_IB) {
@@ -1387,7 +1387,7 @@ roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
 	return sgid_attr->ndev;
 }
 
-static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
+static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
 					  struct cma_req_info *req)
 {
 	struct sockaddr *listen_addr =
@@ -1516,8 +1516,9 @@ static struct rdma_id_private *cma_find_listener(
 	return ERR_PTR(-EINVAL);
 }
 
-static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
-						 struct ib_cm_event *ib_event,
+static struct rdma_id_private *
+cma_id_from_event(struct ib_cm_id *cm_id,
+		  const struct ib_cm_event *ib_event,
 		  struct net_device **net_dev)
 {
 	struct cma_req_info req;
@@ -1766,7 +1767,7 @@ static int cma_rep_recv(struct rdma_id_private *id_priv)
 }
 
 static void cma_set_rep_event_data(struct rdma_cm_event *event,
-				   struct ib_cm_rep_event_param *rep_data,
+				   const struct ib_cm_rep_event_param *rep_data,
 				   void *private_data)
 {
 	event->param.conn.private_data = private_data;
@@ -1779,7 +1780,8 @@ static void cma_set_rep_event_data(struct rdma_cm_event *event,
 	event->param.conn.qp_num = rep_data->remote_qpn;
 }
 
-static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
+static int cma_ib_handler(struct ib_cm_id *cm_id,
+			  const struct ib_cm_event *ib_event)
 {
 	struct rdma_id_private *id_priv = cm_id->context;
 	struct rdma_cm_event event;
@@ -1861,8 +1863,9 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 	return ret;
 }
 
-static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
-					       struct ib_cm_event *ib_event,
+static struct rdma_id_private *
+cma_new_conn_id(const struct rdma_cm_id *listen_id,
+		const struct ib_cm_event *ib_event,
 		struct net_device *net_dev)
 {
 	struct rdma_id_private *listen_id_priv;
@@ -1924,11 +1927,12 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
 	return NULL;
 }
 
-static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
-					      struct ib_cm_event *ib_event,
+static struct rdma_id_private *
+cma_new_udp_id(const struct rdma_cm_id *listen_id,
+	       const struct ib_cm_event *ib_event,
 	       struct net_device *net_dev)
 {
-	struct rdma_id_private *listen_id_priv;
+	const struct rdma_id_private *listen_id_priv;
 	struct rdma_id_private *id_priv;
 	struct rdma_cm_id *id;
 	const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
@@ -1968,7 +1972,7 @@ static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
 }
 
 static void cma_set_req_event_data(struct rdma_cm_event *event,
-				   struct ib_cm_req_event_param *req_data,
+				   const struct ib_cm_req_event_param *req_data,
 				   void *private_data, int offset)
 {
 	event->param.conn.private_data = private_data + offset;
@@ -1982,7 +1986,8 @@ static void cma_set_req_event_data(struct rdma_cm_event *event,
 	event->param.conn.qp_num = req_data->remote_qpn;
 }
 
-static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
+static int cma_check_req_qp_type(const struct rdma_cm_id *id,
+				 const struct ib_cm_event *ib_event)
 {
 	return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
 		 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
@@ -1991,7 +1996,8 @@ static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_e
 		(!id->qp_type));
 }
 
-static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
+static int cma_req_handler(struct ib_cm_id *cm_id,
+			   const struct ib_cm_event *ib_event)
 {
 	struct rdma_id_private *listen_id, *conn_id = NULL;
 	struct rdma_cm_event event;
@@ -3479,11 +3485,12 @@ static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
 }
 
 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
-				struct ib_cm_event *ib_event)
+				const struct ib_cm_event *ib_event)
 {
 	struct rdma_id_private *id_priv = cm_id->context;
 	struct rdma_cm_event event;
-	struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
+	const struct ib_cm_sidr_rep_event_param *rep =
+				&ib_event->param.sidr_rep_rcvd;
 	int ret = 0;
 
 	mutex_lock(&id_priv->handler_mutex);

drivers/infiniband/ulp/ipoib/ipoib_cm.c

@@ -78,7 +78,7 @@ static struct ib_send_wr ipoib_cm_rx_drain_wr = {
 };
 
 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
-			       struct ib_cm_event *event);
+			       const struct ib_cm_event *event);
 
 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
 				  u64 mapping[IPOIB_CM_RX_SG])
@@ -418,7 +418,8 @@ static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_i
 }
 
 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
-			     struct ib_qp *qp, struct ib_cm_req_event_param *req,
+			     struct ib_qp *qp,
+			     const struct ib_cm_req_event_param *req,
 			     unsigned int psn)
 {
 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
@@ -438,7 +439,8 @@ static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 	return ib_send_cm_rep(cm_id, &rep);
 }
 
-static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+static int ipoib_cm_req_handler(struct ib_cm_id *cm_id,
+				const struct ib_cm_event *event)
 {
 	struct net_device *dev = cm_id->context;
 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
@@ -500,7 +502,7 @@ static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *even
 }
 
 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
-			       struct ib_cm_event *event)
+			       const struct ib_cm_event *event)
 {
 	struct ipoib_cm_rx *p;
 	struct ipoib_dev_priv *priv;
@@ -978,7 +980,8 @@ void ipoib_cm_dev_stop(struct net_device *dev)
 	cancel_delayed_work(&priv->cm.stale_task);
 }
 
-static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id,
+				const struct ib_cm_event *event)
 {
 	struct ipoib_cm_tx *p = cm_id->context;
 	struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
@@ -1244,7 +1247,7 @@ static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
 }
 
 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
-			       struct ib_cm_event *event)
+			       const struct ib_cm_event *event)
 {
 	struct ipoib_cm_tx *tx = cm_id->context;
 	struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);

drivers/infiniband/ulp/srp/ib_srp.c

@@ -142,7 +142,8 @@ static void srp_remove_one(struct ib_device *device, void *client_data);
 static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
 		const char *opname);
-static int srp_ib_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
+static int srp_ib_cm_handler(struct ib_cm_id *cm_id,
+			     const struct ib_cm_event *event);
 static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,
 			       struct rdma_cm_event *event);
 
@@ -2553,7 +2554,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
 }
 
 static void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,
-				  struct ib_cm_event *event,
+				  const struct ib_cm_event *event,
 				  struct srp_rdma_ch *ch)
 {
 	struct srp_target_port *target = ch->target;
@@ -2638,7 +2639,8 @@ static void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,
 	}
 }
 
-static int srp_ib_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+static int srp_ib_cm_handler(struct ib_cm_id *cm_id,
+			     const struct ib_cm_event *event)
 {
 	struct srp_rdma_ch *ch = cm_id->context;
 	struct srp_target_port *target = ch->target;

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -2401,7 +2401,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
 }
 
 static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,
-			       struct ib_cm_req_event_param *param,
+			       const struct ib_cm_req_event_param *param,
 			       void *private_data)
 {
 	char sguid[40];
@@ -2513,7 +2513,8 @@ static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
  * a non-zero value in any other case will trigger a race with the
  * ib_destroy_cm_id() call in srpt_release_channel().
  */
-static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+static int srpt_cm_handler(struct ib_cm_id *cm_id,
+			   const struct ib_cm_event *event)
 {
 	struct srpt_rdma_ch *ch = cm_id->context;
 	int ret;

include/rdma/ib_cm.h

@@ -311,7 +311,7 @@ struct ib_cm_event {
  * destroy the @cm_id after the callback completes.
  */
 typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
-			     struct ib_cm_event *event);
+			     const struct ib_cm_event *event);
 
 struct ib_cm_id {
 	ib_cm_handler		cm_handler;