diff options
author | Andy Grover <andy.grover@oracle.com> | 2009-02-24 15:30:29 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2009-02-27 07:39:29 (GMT) |
commit | eff5f53bef75c0864a5da06bb688939092b848dc (patch) | |
tree | 116790e2c93ba3adbbce52704810569cd5517492 /net/rds/rdma.h | |
parent | bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb (diff) | |
download | linux-eff5f53bef75c0864a5da06bb688939092b848dc.tar.xz |
RDS: RDMA support
Some transports may support RDMA features. This handles the
non-transport-specific parts, like pinning user pages and
tracking mapped regions.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/rdma.h')
-rw-r--r-- | net/rds/rdma.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/net/rds/rdma.h b/net/rds/rdma.h new file mode 100644 index 0000000..4255120 --- /dev/null +++ b/net/rds/rdma.h @@ -0,0 +1,84 @@ +#ifndef _RDS_RDMA_H +#define _RDS_RDMA_H + +#include <linux/rbtree.h> +#include <linux/spinlock.h> +#include <linux/scatterlist.h> + +#include "rds.h" + +struct rds_mr { + struct rb_node r_rb_node; + atomic_t r_refcount; + u32 r_key; + + /* A copy of the creation flags */ + unsigned int r_use_once:1; + unsigned int r_invalidate:1; + unsigned int r_write:1; + + /* This is for RDS_MR_DEAD. + * It would be nice & consistent to make this part of the above + * bit field here, but we need to use test_and_set_bit. + */ + unsigned long r_state; + struct rds_sock *r_sock; /* back pointer to the socket that owns us */ + struct rds_transport *r_trans; + void *r_trans_private; +}; + +/* Flags for mr->r_state */ +#define RDS_MR_DEAD 0 + +struct rds_rdma_op { + u32 r_key; + u64 r_remote_addr; + unsigned int r_write:1; + unsigned int r_fence:1; + unsigned int r_notify:1; + unsigned int r_recverr:1; + unsigned int r_mapped:1; + struct rds_notifier *r_notifier; + unsigned int r_bytes; + unsigned int r_nents; + unsigned int r_count; + struct scatterlist r_sg[0]; +}; + +static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) +{ + return r_key | (((u64) offset) << 32); +} + +static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) +{ + return cookie; +} + +static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) +{ + return cookie >> 32; +} + +int rds_get_mr(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, + struct cmsghdr *cmsg); +int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, + struct cmsghdr *cmsg); +int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, + struct cmsghdr *cmsg); +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); + +extern void __rds_put_mr_final(struct rds_mr *mr); +static inline void rds_mr_put(struct rds_mr *mr) +{ + if (atomic_dec_and_test(&mr->r_refcount)) + __rds_put_mr_final(mr); +} + +#endif |