[ofa-general] [PATCH/RFC] RDMA/cma: Remove padding arrays by using struct sockaddr_storage

[Roland Dreier]

There are a few places that the RDMA CM code handles IPv6 by doing

	struct sockaddr		addr;
	u8			pad[sizeof(struct sockaddr_in6) -
				    sizeof(struct sockaddr)];

This is fragile and ugly; handle this in a better way with just

	struct sockaddr_storage	addr;

Signed-off-by: Roland Dreier <rolandd at cisco.com>
---
Any objections to merging the cleanup below?


 drivers/infiniband/core/cma.c  |    4 +---
 drivers/infiniband/core/ucma.c |   10 ++++------
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index e980ff3..a16510b 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -155,9 +155,7 @@ struct cma_multicast {
 	} multicast;
 	struct list_head	list;
 	void			*context;
-	struct sockaddr		addr;
-	u8			pad[sizeof(struct sockaddr_in6) -
-				    sizeof(struct sockaddr)];
+	struct sockaddr_storage	addr;
 };
 
 struct cma_work {
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index b41dd26..d5a825f 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -81,9 +81,7 @@ struct ucma_multicast {
 
 	u64			uid;
 	struct list_head	list;
-	struct sockaddr		addr;
-	u8			pad[sizeof(struct sockaddr_in6) -
-				    sizeof(struct sockaddr)];
+	struct sockaddr_storage	addr;
 };
 
 struct ucma_event {
@@ -913,7 +911,7 @@ static ssize_t ucma_join_multicast(struct ucma_file *file,
 
 	mc->uid = cmd.uid;
 	memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
-	ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
+	ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
 	if (ret)
 		goto err2;
 
@@ -929,7 +927,7 @@ static ssize_t ucma_join_multicast(struct ucma_file *file,
 	return 0;
 
 err3:
-	rdma_leave_multicast(ctx->cm_id, &mc->addr);
+	rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
 	ucma_cleanup_mc_events(mc);
 err2:
 	mutex_lock(&mut);
@@ -975,7 +973,7 @@ static ssize_t ucma_leave_multicast(struct ucma_file *file,
 		goto out;
 	}
 
-	rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
+	rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
 	mutex_lock(&mc->ctx->file->mut);
 	ucma_cleanup_mc_events(mc);
 	list_del(&mc->list);