Root/net/rds/rdma.h

1#ifndef _RDS_RDMA_H
2#define _RDS_RDMA_H
3
4#include <linux/rbtree.h>
5#include <linux/spinlock.h>
6#include <linux/scatterlist.h>
7
8#include "rds.h"
9
10struct rds_mr {
11    struct rb_node r_rb_node;
12    atomic_t r_refcount;
13    u32 r_key;
14
15    /* A copy of the creation flags */
16    unsigned int r_use_once:1;
17    unsigned int r_invalidate:1;
18    unsigned int r_write:1;
19
20    /* This is for RDS_MR_DEAD.
21     * It would be nice & consistent to make this part of the above
22     * bit field here, but we need to use test_and_set_bit.
23     */
24    unsigned long r_state;
25    struct rds_sock *r_sock; /* back pointer to the socket that owns us */
26    struct rds_transport *r_trans;
27    void *r_trans_private;
28};
29
30/* Flags for mr->r_state */
31#define RDS_MR_DEAD 0
32
33struct rds_rdma_op {
34    u32 r_key;
35    u64 r_remote_addr;
36    unsigned int r_write:1;
37    unsigned int r_fence:1;
38    unsigned int r_notify:1;
39    unsigned int r_recverr:1;
40    unsigned int r_mapped:1;
41    struct rds_notifier *r_notifier;
42    unsigned int r_bytes;
43    unsigned int r_nents;
44    unsigned int r_count;
45    struct scatterlist r_sg[0];
46};
47
48static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
49{
50    return r_key | (((u64) offset) << 32);
51}
52
53static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
54{
55    return cookie;
56}
57
58static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
59{
60    return cookie >> 32;
61}
62
63int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
64int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
65int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
66void rds_rdma_drop_keys(struct rds_sock *rs);
67int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
68              struct cmsghdr *cmsg);
69int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
70              struct cmsghdr *cmsg);
71int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
72              struct cmsghdr *cmsg);
73int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
74              struct cmsghdr *cmsg);
75void rds_rdma_free_op(struct rds_rdma_op *ro);
76void rds_rdma_send_complete(struct rds_message *rm, int);
77
78extern void __rds_put_mr_final(struct rds_mr *mr);
79static inline void rds_mr_put(struct rds_mr *mr)
80{
81    if (atomic_dec_and_test(&mr->r_refcount))
82        __rds_put_mr_final(mr);
83}
84
85#endif
86

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