From 244546f0d3101c5441f5b14cfe8a79d62679eaea Mon Sep 17 00:00:00 2001 From: Andy Grover Date: Fri, 30 Oct 2009 08:54:53 +0000 Subject: 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 Signed-off-by: David S. Miller --- net/rds/af_rds.c | 3 +++ net/rds/rdma.c | 24 ++++++++++++++++++++++++ net/rds/rdma.h | 1 + 3 files changed, 28 insertions(+) (limited to 'net') diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c index a202e5b3607..2b978dc6e75 100644 --- a/net/rds/af_rds.c +++ b/net/rds/af_rds.c @@ -265,6 +265,9 @@ static int rds_setsockopt(struct socket *sock, int level, int optname, case RDS_GET_MR: ret = rds_get_mr(rs, optval, optlen); break; + case RDS_GET_MR_FOR_DEST: + ret = rds_get_mr_for_dest(rs, optval, optlen); + break; case RDS_FREE_MR: ret = rds_free_mr(rs, optval, optlen); break; diff --git a/net/rds/rdma.c b/net/rds/rdma.c index 8dc83d2caa5..971b5a66845 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 */ diff --git a/net/rds/rdma.h b/net/rds/rdma.h index 425512098b0..909c39835a5 100644 --- a/net/rds/rdma.h +++ b/net/rds/rdma.h @@ -61,6 +61,7 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) } int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); +int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); void rds_rdma_drop_keys(struct rds_sock *rs); int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, -- cgit v1.2.3-18-g5258