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Commit 1890896b authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

xprtrdma: Refactor rpcrdma_ep_connect 



I'm about to add another arm to

    if (ep->rep_connected != 0)

It will be cleaner to use a switch statement here. We'll be looking
for a couple of specific errnos, or "anything else," basically to
sort out the difference between a normal reconnect and recovery from
device removal.

This is a refactoring change only.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent bebd0318

net/sunrpc/xprtrdma/verbs.c

+63 −46
Original line number Diff line number Diff line
@@ -711,69 +711,84 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) 
	ib_free_cq(ep->rep_attr.send_cq);

}



/*

 * Connect unconnected endpoint.

 */

int

rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)

static int

rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep,

		     struct rpcrdma_ia *ia)

{

	struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,

						   rx_ia);

	struct sockaddr *sap = (struct sockaddr *)&r_xprt->rx_data.addr;

	struct rdma_cm_id *id, *old;

	struct sockaddr *sap;

	unsigned int extras;

	int rc = 0;

	int err, rc;



	if (ep->rep_connected != 0) {

retry:

	dprintk("RPC:       %s: reconnecting...\n", __func__);



	rpcrdma_ep_disconnect(ep, ia);



		sap = (struct sockaddr *)&r_xprt->rx_data.addr;

		id = rpcrdma_create_id(r_xprt, ia, sap);

		if (IS_ERR(id)) {

	rc = -EHOSTUNREACH;

	id = rpcrdma_create_id(r_xprt, ia, sap);

	if (IS_ERR(id))

		goto out;

		}

		/* TEMP TEMP TEMP - fail if new device:

		 * Deregister/remarshal *all* requests!

		 * Close and recreate adapter, pd, etc!

		 * Re-determine all attributes still sane!

		 * More stuff I haven't thought of!

		 * Rrrgh!



	/* As long as the new ID points to the same device as the

	 * old ID, we can reuse the transport's existing PD and all

	 * previously allocated MRs. Also, the same device means

	 * the transport's previous DMA mappings are still valid.

	 *

	 * This is a sanity check only. There should be no way these

	 * point to two different devices here.

	 */

		if (ia->ri_device != id->device) {

			printk("RPC:       %s: can't reconnect on "

				"different device!\n", __func__);

			rpcrdma_destroy_id(id);

	old = id;

	rc = -ENETUNREACH;

			goto out;

	if (ia->ri_device != id->device) {

		pr_err("rpcrdma: can't reconnect on different device!\n");

		goto out_destroy;

	}

		/* END TEMP */

		rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);

		if (rc) {

			dprintk("RPC:       %s: rdma_create_qp failed %i\n",

				__func__, rc);

			rpcrdma_destroy_id(id);

			rc = -ENETUNREACH;

			goto out;



	err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);

	if (err) {

		dprintk("RPC:       %s: rdma_create_qp returned %d\n",

			__func__, err);

		goto out_destroy;

	}



	/* Atomically replace the transport's ID and QP. */

	rc = 0;

	old = ia->ri_id;

	ia->ri_id = id;



	rdma_destroy_qp(old);



out_destroy:

	rpcrdma_destroy_id(old);

	} else {

out:

	return rc;

}



/*

 * Connect unconnected endpoint.

 */

int

rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)

{

	struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,

						   rx_ia);

	unsigned int extras;

	int rc;



retry:

	switch (ep->rep_connected) {

	case 0:

		dprintk("RPC:       %s: connecting...\n", __func__);

		rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);

		if (rc) {

			dprintk("RPC:       %s: rdma_create_qp failed %i\n",

				__func__, rc);

			/* do not update ep->rep_connected */

			return -ENETUNREACH;

			rc = -ENETUNREACH;

			goto out_noupdate;

		}

		break;

	default:

		rc = rpcrdma_ep_reconnect(r_xprt, ep, ia);

		if (rc)

			goto out;

	}



	ep->rep_connected = 0;
@@ -801,6 +816,8 @@ rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) 
out:

	if (rc)

		ep->rep_connected = rc;



out_noupdate:

	return rc;

}