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authorAndy Grover <andy.grover@oracle.com>2009-10-30 08:54:53 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-30 15:06:37 -0700
commit244546f0d3101c5441f5b14cfe8a79d62679eaea (patch)
tree52ba3f802e695e6b052aeb3c38ae76fb5f5f0be6 /net/rds/rdma.c
parent6639104bd826e0b1388c69a6b7564fffc636c8a8 (diff)
downloadop-kernel-dev-244546f0d3101c5441f5b14cfe8a79d62679eaea.zip
op-kernel-dev-244546f0d3101c5441f5b14cfe8a79d62679eaea.tar.gz
RDS: Add GET_MR_FOR_DEST sockopt
RDS currently supports a GET_MR sockopt to establish a memory region (MR) for a chunk of memory. However, the fastreg method ties a MR to a particular destination. The GET_MR_FOR_DEST sockopt allows the remote machine to be specified, and thus support for fastreg (aka FRWRs). Note that this patch does *not* do all of this - it simply implements the new sockopt in terms of the old one, so applications can begin to use the new sockopt in preparation for cutover to FRWRs. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/rdma.c')
-rw-r--r--net/rds/rdma.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 8dc83d2..971b5a6 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -317,6 +317,30 @@ int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen)
return __rds_rdma_map(rs, &args, NULL, NULL);
}
+int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
+{
+ struct rds_get_mr_for_dest_args args;
+ struct rds_get_mr_args new_args;
+
+ if (optlen != sizeof(struct rds_get_mr_for_dest_args))
+ return -EINVAL;
+
+ if (copy_from_user(&args, (struct rds_get_mr_for_dest_args __user *)optval,
+ sizeof(struct rds_get_mr_for_dest_args)))
+ return -EFAULT;
+
+ /*
+ * Initially, just behave like get_mr().
+ * TODO: Implement get_mr as wrapper around this
+ * and deprecate it.
+ */
+ new_args.vec = args.vec;
+ new_args.cookie_addr = args.cookie_addr;
+ new_args.flags = args.flags;
+
+ return __rds_rdma_map(rs, &new_args, NULL, NULL);
+}
+
/*
* Free the MR indicated by the given R_Key
*/
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