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RDS: Implement atomic operations

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Implement a CMSG-based interface to do FADD and CSWP ops.

Alter send routines to handle atomic ops.

Add atomic counters to stats.

Add xmit_atomic() to struct rds_transport

Inline rds_ib_send_unmap_rdma into unmap_rm

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover 2010-01-12 14:33:38 -08:00
commit 15133f6e67
9 changed files with 321 additions and 23 deletions
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19
include/linux/rds.h
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@ -73,6 +73,8 @@
#define RDS_CMSG_RDMA_MAP 3
#define RDS_CMSG_RDMA_STATUS 4
#define RDS_CMSG_CONG_UPDATE 5
#define RDS_CMSG_ATOMIC_FADD 6
#define RDS_CMSG_ATOMIC_CSWP 7
#define RDS_INFO_FIRST 10000
#define RDS_INFO_COUNTERS 10000
@ -237,6 +239,23 @@ struct rds_rdma_args {
u_int64_t user_token;
};
struct rds_atomic_args {
rds_rdma_cookie_t cookie;
uint64_t local_addr;
uint64_t remote_addr;
union {
struct {
uint64_t compare;
uint64_t swap;
} cswp;
struct {
uint64_t add;
} fadd;
};
uint64_t flags;
uint64_t user_token;
};
struct rds_rdma_notify {
u_int64_t user_token;
int32_t status;