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RDS: Add GET_MR_FOR_DEST sockopt

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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>
This commit is contained in:
Andy Grover 2009-10-30 08:54:53 +00:00 • committed by David S. Miller
commit 244546f0d3
4 changed files with 36 additions and 0 deletions
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8
include/linux/rds.h
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@ -56,6 +56,7 @@
/* deprecated: RDS_BARRIER 4 */
#define RDS_RECVERR 5
#define RDS_CONG_MONITOR 6
#define RDS_GET_MR_FOR_DEST 7
/*
* Control message types for SOL_RDS.
@ -224,6 +225,13 @@ struct rds_get_mr_args {
uint64_t flags;
};
struct rds_get_mr_for_dest_args {
struct sockaddr_storage dest_addr;
struct rds_iovec vec;
u_int64_t cookie_addr;
uint64_t flags;
};
struct rds_free_mr_args {
rds_rdma_cookie_t cookie;
u_int64_t flags;