diff options
Diffstat (limited to 'net/sunrpc/xprtrdma/verbs.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 24ea6dd..cdd6aac 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1828,6 +1828,61 @@ rpcrdma_deregister_internal(struct rpcrdma_ia *ia, return rc; } +/** + * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers + * @ia: controlling rpcrdma_ia + * @size: size of buffer to be allocated, in bytes + * @flags: GFP flags + * + * Returns pointer to private header of an area of internally + * registered memory, or an ERR_PTR. The registered buffer follows + * the end of the private header. + * + * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for + * receiving the payload of RDMA RECV operations. regbufs are not + * used for RDMA READ/WRITE operations, thus are registered only for + * LOCAL access. + */ +struct rpcrdma_regbuf * +rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags) +{ + struct rpcrdma_regbuf *rb; + int rc; + + rc = -ENOMEM; + rb = kmalloc(sizeof(*rb) + size, flags); + if (rb == NULL) + goto out; + + rb->rg_size = size; + rb->rg_owner = NULL; + rc = rpcrdma_register_internal(ia, rb->rg_base, size, + &rb->rg_mr, &rb->rg_iov); + if (rc) + goto out_free; + + return rb; + +out_free: + kfree(rb); +out: + return ERR_PTR(rc); +} + +/** + * rpcrdma_free_regbuf - deregister and free registered buffer + * @ia: controlling rpcrdma_ia + * @rb: regbuf to be deregistered and freed + */ +void +rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) +{ + if (rb) { + rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov); + kfree(rb); + } +} + /* * Wrappers for chunk registration, shared by read/write chunk code. */ |