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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
parent a63273d499
commit 15133f6e67
9 changed files with 321 additions and 23 deletions
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33
net/rds/rds.h
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@@ -97,6 +97,7 @@ struct rds_connection {
unsigned int c_xmit_hdr_off;
unsigned int c_xmit_data_off;
unsigned int c_xmit_rdma_sent;
unsigned int c_xmit_atomic_sent;
spinlock_t c_lock; /* protect msg queues */
u64 c_next_tx_seq;
@@ -260,6 +261,10 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
return cookie >> 32;
}
/* atomic operation types */
#define RDS_ATOMIC_TYPE_CSWP 0
#define RDS_ATOMIC_TYPE_FADD 1
/*
* m_sock_item and m_conn_item are on lists that are serialized under
* conn->c_lock. m_sock_item has additional meaning in that once it is empty
@@ -315,11 +320,27 @@ struct rds_message {
struct rds_sock *m_rs;
rds_rdma_cookie_t m_rdma_cookie;
struct {
struct {
struct rm_atomic_op {
int op_type;
uint64_t op_swap_add;
uint64_t op_compare;
u32 op_rkey;
u64 op_remote_addr;
unsigned int op_notify:1;
unsigned int op_recverr:1;
unsigned int op_mapped:1;
unsigned int op_active:1;
struct rds_notifier *op_notifier;
struct scatterlist *op_sg;
struct rds_mr *op_rdma_mr;
} atomic;
struct rm_rdma_op {
struct rds_rdma_op m_rdma_op;
struct rds_mr *m_rdma_mr;
} rdma;
struct {
struct rm_data_op {
unsigned int m_nents;
unsigned int m_count;
struct scatterlist *m_sg;
@@ -397,6 +418,7 @@ struct rds_transport {
int (*xmit_cong_map)(struct rds_connection *conn,
struct rds_cong_map *map, unsigned long offset);
int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
int (*recv)(struct rds_connection *conn);
int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
size_t size);
@@ -546,6 +568,8 @@ struct rds_statistics {
uint64_t s_cong_update_received;
uint64_t s_cong_send_error;
uint64_t s_cong_send_blocked;
uint64_t s_atomic_cswp;
uint64_t s_atomic_fadd;
};
/* af_rds.c */
@@ -722,7 +746,10 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
void rds_rdma_free_op(struct rds_rdma_op *ro);
void rds_rdma_send_complete(struct rds_message *rm, int);
void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
extern void __rds_put_mr_final(struct rds_mr *mr);
static inline void rds_mr_put(struct rds_mr *mr)