RDS: Add GET_MR_FOR_DEST sockopt
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>
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4 changed files with 36 additions and 0 deletions
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@ -56,6 +56,7 @@
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/* deprecated: RDS_BARRIER 4 */
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#define RDS_RECVERR 5
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#define RDS_CONG_MONITOR 6
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#define RDS_GET_MR_FOR_DEST 7
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/*
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* Control message types for SOL_RDS.
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@ -224,6 +225,13 @@ struct rds_get_mr_args {
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uint64_t flags;
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};
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struct rds_get_mr_for_dest_args {
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struct sockaddr_storage dest_addr;
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struct rds_iovec vec;
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u_int64_t cookie_addr;
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uint64_t flags;
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};
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struct rds_free_mr_args {
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rds_rdma_cookie_t cookie;
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u_int64_t flags;
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@ -265,6 +265,9 @@ static int rds_setsockopt(struct socket *sock, int level, int optname,
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case RDS_GET_MR:
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ret = rds_get_mr(rs, optval, optlen);
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break;
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case RDS_GET_MR_FOR_DEST:
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ret = rds_get_mr_for_dest(rs, optval, optlen);
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break;
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case RDS_FREE_MR:
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ret = rds_free_mr(rs, optval, optlen);
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break;
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@ -317,6 +317,30 @@ int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen)
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return __rds_rdma_map(rs, &args, NULL, NULL);
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}
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int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen)
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{
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struct rds_get_mr_for_dest_args args;
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struct rds_get_mr_args new_args;
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if (optlen != sizeof(struct rds_get_mr_for_dest_args))
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return -EINVAL;
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if (copy_from_user(&args, (struct rds_get_mr_for_dest_args __user *)optval,
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sizeof(struct rds_get_mr_for_dest_args)))
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return -EFAULT;
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/*
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* Initially, just behave like get_mr().
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* TODO: Implement get_mr as wrapper around this
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* and deprecate it.
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*/
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new_args.vec = args.vec;
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new_args.cookie_addr = args.cookie_addr;
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new_args.flags = args.flags;
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return __rds_rdma_map(rs, &new_args, NULL, NULL);
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}
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/*
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* Free the MR indicated by the given R_Key
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*/
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@ -61,6 +61,7 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
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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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