244546f0d3
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>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#ifndef _RDS_RDMA_H
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#define _RDS_RDMA_H
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#include <linux/rbtree.h>
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#include <linux/spinlock.h>
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#include <linux/scatterlist.h>
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#include "rds.h"
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struct rds_mr {
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struct rb_node r_rb_node;
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atomic_t r_refcount;
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u32 r_key;
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/* A copy of the creation flags */
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unsigned int r_use_once:1;
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unsigned int r_invalidate:1;
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unsigned int r_write:1;
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/* This is for RDS_MR_DEAD.
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* It would be nice & consistent to make this part of the above
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* bit field here, but we need to use test_and_set_bit.
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*/
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unsigned long r_state;
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struct rds_sock *r_sock; /* back pointer to the socket that owns us */
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struct rds_transport *r_trans;
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void *r_trans_private;
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};
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/* Flags for mr->r_state */
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#define RDS_MR_DEAD 0
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struct rds_rdma_op {
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u32 r_key;
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u64 r_remote_addr;
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unsigned int r_write:1;
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unsigned int r_fence:1;
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unsigned int r_notify:1;
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unsigned int r_recverr:1;
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unsigned int r_mapped:1;
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struct rds_notifier *r_notifier;
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unsigned int r_bytes;
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unsigned int r_nents;
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unsigned int r_count;
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struct scatterlist r_sg[0];
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};
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static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
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{
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return r_key | (((u64) offset) << 32);
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}
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static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
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{
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return cookie;
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}
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static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
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{
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return cookie >> 32;
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}
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int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
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int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
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int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
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void rds_rdma_drop_keys(struct rds_sock *rs);
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int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
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struct cmsghdr *cmsg);
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int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
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struct cmsghdr *cmsg);
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int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
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struct cmsghdr *cmsg);
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int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
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struct cmsghdr *cmsg);
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void rds_rdma_free_op(struct rds_rdma_op *ro);
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void rds_rdma_send_complete(struct rds_message *rm, int);
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extern void __rds_put_mr_final(struct rds_mr *mr);
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static inline void rds_mr_put(struct rds_mr *mr)
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{
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if (atomic_dec_and_test(&mr->r_refcount))
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__rds_put_mr_final(mr);
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}
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#endif
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