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Commit 346aa66b authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
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xprtrdma: Introduce helpers for allocating MWs 



We eventually want to handle allocating MWs one at a time, as
needed, instead of grabbing 64 and throwing them at each RPC in the
pipeline.

Add a helper for grabbing an MW off rb_mws, and a helper for
returning an MW to rb_mws. These will be used in a subsequent patch.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Reviewed-by: default avatarSteve Wise <swise@opengridcomputing.com>
Reviewed-by: default avatarSagi Grimberg <sagig@mellanox.com>
Tested-By: default avatarDevesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 89e0d112

net/sunrpc/xprtrdma/verbs.c

+31 −0
Original line number Diff line number Diff line
@@ -1173,6 +1173,37 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) 
	kfree(buf->rb_pool);

}



struct rpcrdma_mw *

rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)

{

	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;

	struct rpcrdma_mw *mw = NULL;

	unsigned long flags;



	spin_lock_irqsave(&buf->rb_lock, flags);

	if (!list_empty(&buf->rb_mws)) {

		mw = list_first_entry(&buf->rb_mws,

				      struct rpcrdma_mw, mw_list);

		list_del_init(&mw->mw_list);

	}

	spin_unlock_irqrestore(&buf->rb_lock, flags);



	if (!mw)

		pr_err("RPC:       %s: no MWs available\n", __func__);

	return mw;

}



void

rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)

{

	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;

	unsigned long flags;



	spin_lock_irqsave(&buf->rb_lock, flags);

	list_add_tail(&mw->mw_list, &buf->rb_mws);

	spin_unlock_irqrestore(&buf->rb_lock, flags);

}



/* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving

 * some req segments uninitialized.

 */

net/sunrpc/xprtrdma/xprt_rdma.h

+2 −0
Original line number Diff line number Diff line
@@ -413,6 +413,8 @@ int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *, 
int rpcrdma_buffer_create(struct rpcrdma_xprt *);

void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);



struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);

void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);

struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);

void rpcrdma_buffer_put(struct rpcrdma_req *);

void rpcrdma_recv_buffer_get(struct rpcrdma_req *);