RDMA/core: Constify dst_addr argument

Following APIs are not supposed to modify addr or dest_addr contents.
Therefore make those function argument const for better code
readability.

1. rdma_resolve_ip()
2. rdma_addr_size()
3. rdma_resolve_addr()

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/addr.c

@@ -188,7 +188,7 @@ static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 	return -ENODATA;
 }
 
-int rdma_addr_size(struct sockaddr *addr)
+int rdma_addr_size(const struct sockaddr *addr)
 {
 	switch (addr->sa_family) {
 	case AF_INET:
@@ -585,7 +585,7 @@ static void process_one_req(struct work_struct *_work)
 	spin_unlock_bh(&lock);
 }
 
-int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
 		    struct rdma_dev_addr *addr, int timeout_ms,
 		    void (*callback)(int status, struct sockaddr *src_addr,
 				     struct rdma_dev_addr *addr, void *context),

drivers/infiniband/core/cma.c

@@ -1046,7 +1046,7 @@ int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 }
 EXPORT_SYMBOL(rdma_init_qp_attr);
 
-static inline int cma_zero_addr(struct sockaddr *addr)
+static inline int cma_zero_addr(const struct sockaddr *addr)
 {
 	switch (addr->sa_family) {
 	case AF_INET:
@@ -1060,7 +1060,7 @@ static inline int cma_zero_addr(struct sockaddr *addr)
 	}
 }
 
-static inline int cma_loopback_addr(struct sockaddr *addr)
+static inline int cma_loopback_addr(const struct sockaddr *addr)
 {
 	switch (addr->sa_family) {
 	case AF_INET:
@@ -1074,7 +1074,7 @@ static inline int cma_loopback_addr(struct sockaddr *addr)
 	}
 }
 
-static inline int cma_any_addr(struct sockaddr *addr)
+static inline int cma_any_addr(const struct sockaddr *addr)
 {
 	return cma_zero_addr(addr) || cma_loopback_addr(addr);
 }
@@ -1097,7 +1097,7 @@ static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
 	}
 }
 
-static __be16 cma_port(struct sockaddr *addr)
+static __be16 cma_port(const struct sockaddr *addr)
 {
 	struct sockaddr_ib *sib;
 
@@ -1115,7 +1115,7 @@ static __be16 cma_port(struct sockaddr *addr)
 	}
 }
 
-static inline int cma_any_port(struct sockaddr *addr)
+static inline int cma_any_port(const struct sockaddr *addr)
 {
 	return !cma_port(addr);
 }
@@ -2944,7 +2944,7 @@ err:
 }
 
 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
-			 struct sockaddr *dst_addr)
+			 const struct sockaddr *dst_addr)
 {
 	if (!src_addr || !src_addr->sa_family) {
 		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
@@ -2965,7 +2965,7 @@ static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 }
 
 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
-		      struct sockaddr *dst_addr, int timeout_ms)
+		      const struct sockaddr *dst_addr, int timeout_ms)
 {
 	struct rdma_id_private *id_priv;
 	int ret;

include/rdma/ib_addr.h

@@ -97,7 +97,7 @@ int rdma_translate_ip(const struct sockaddr *addr,
  *   or been canceled.  A status of 0 indicates success.
  * @context: User-specified context associated with the call.
  */
-int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr,
+int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
 		    struct rdma_dev_addr *addr, int timeout_ms,
 		    void (*callback)(int status, struct sockaddr *src_addr,
 				     struct rdma_dev_addr *addr, void *context),
@@ -109,7 +109,7 @@ void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
 		    const struct net_device *dev,
 		    const unsigned char *dst_dev_addr);
 
-int rdma_addr_size(struct sockaddr *addr);
+int rdma_addr_size(const struct sockaddr *addr);
 int rdma_addr_size_in6(struct sockaddr_in6 *addr);
 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
 

include/rdma/rdma_cm.h

@@ -192,7 +192,7 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
  * @timeout_ms: Time to wait for resolution to complete.
  */
 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
-		      struct sockaddr *dst_addr, int timeout_ms);
+		      const struct sockaddr *dst_addr, int timeout_ms);
 
 /**
  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier