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Commit 2e84522c authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
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xprtrdma: Allocate each struct rpcrdma_mw separately 



Currently rpcrdma_buffer_create() allocates struct rpcrdma_mw's as
a single contiguous area of memory. It amounts to quite a bit of
memory, and there's no requirement for these to be carved from a
single piece of contiguous memory.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Tested-by: default avatarSteve Wise <swise@opengridcomputing.com>
Tested-by: default avatarShirley Ma <shirley.ma@oracle.com>
Tested-by: default avatarDevesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent f590e878

net/sunrpc/xprtrdma/verbs.c

+143 −99
Original line number Diff line number Diff line
@@ -1005,9 +1005,91 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) 
	return rc;

}



/*

 * Initialize buffer memory

 */

static int

rpcrdma_init_fmrs(struct rpcrdma_ia *ia, struct rpcrdma_buffer *buf)

{

	int mr_access_flags = IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ;

	struct ib_fmr_attr fmr_attr = {

		.max_pages	= RPCRDMA_MAX_DATA_SEGS,

		.max_maps	= 1,

		.page_shift	= PAGE_SHIFT

	};

	struct rpcrdma_mw *r;

	int i, rc;



	i = (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS;

	dprintk("RPC:       %s: initalizing %d FMRs\n", __func__, i);



	while (i--) {

		r = kzalloc(sizeof(*r), GFP_KERNEL);

		if (r == NULL)

			return -ENOMEM;



		r->r.fmr = ib_alloc_fmr(ia->ri_pd, mr_access_flags, &fmr_attr);

		if (IS_ERR(r->r.fmr)) {

			rc = PTR_ERR(r->r.fmr);

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

				__func__, rc);

			goto out_free;

		}



		list_add(&r->mw_list, &buf->rb_mws);

		list_add(&r->mw_all, &buf->rb_all);

	}

	return 0;



out_free:

	kfree(r);

	return rc;

}



static int

rpcrdma_init_frmrs(struct rpcrdma_ia *ia, struct rpcrdma_buffer *buf)

{

	struct rpcrdma_frmr *f;

	struct rpcrdma_mw *r;

	int i, rc;



	i = (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS;

	dprintk("RPC:       %s: initalizing %d FRMRs\n", __func__, i);



	while (i--) {

		r = kzalloc(sizeof(*r), GFP_KERNEL);

		if (r == NULL)

			return -ENOMEM;

		f = &r->r.frmr;



		f->fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd,

						ia->ri_max_frmr_depth);

		if (IS_ERR(f->fr_mr)) {

			rc = PTR_ERR(f->fr_mr);

			dprintk("RPC:       %s: ib_alloc_fast_reg_mr "

				"failed %i\n", __func__, rc);

			goto out_free;

		}



		f->fr_pgl = ib_alloc_fast_reg_page_list(ia->ri_id->device,

							ia->ri_max_frmr_depth);

		if (IS_ERR(f->fr_pgl)) {

			rc = PTR_ERR(f->fr_pgl);

			dprintk("RPC:       %s: ib_alloc_fast_reg_page_list "

				"failed %i\n", __func__, rc);



			ib_dereg_mr(f->fr_mr);

			goto out_free;

		}



		list_add(&r->mw_list, &buf->rb_mws);

		list_add(&r->mw_all, &buf->rb_all);

	}



	return 0;



out_free:

	kfree(r);

	return rc;

}



int

rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,

	struct rpcrdma_ia *ia, struct rpcrdma_create_data_internal *cdata)
@@ -1015,7 +1097,6 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, 
	char *p;

	size_t len, rlen, wlen;

	int i, rc;

	struct rpcrdma_mw *r;



	buf->rb_max_requests = cdata->max_requests;

	spin_lock_init(&buf->rb_lock);
@@ -1026,28 +1107,12 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, 
	 *   2.  arrays of struct rpcrdma_req to fill in pointers

	 *   3.  array of struct rpcrdma_rep for replies

	 *   4.  padding, if any

	 *   5.  mw's, fmr's or frmr's, if any

	 * Send/recv buffers in req/rep need to be registered

	 */



	len = buf->rb_max_requests *

		(sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));

	len += cdata->padding;

	switch (ia->ri_memreg_strategy) {

	case RPCRDMA_FRMR:

		len += buf->rb_max_requests * RPCRDMA_MAX_SEGS *

				sizeof(struct rpcrdma_mw);

		break;

	case RPCRDMA_MTHCAFMR:

		/* TBD we are perhaps overallocating here */

		len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS *

				sizeof(struct rpcrdma_mw);

		break;

	default:

		break;

	}



	/* allocate 1, 4 and 5 in one shot */

	p = kzalloc(len, GFP_KERNEL);

	if (p == NULL) {

		dprintk("RPC:       %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
@@ -1075,53 +1140,16 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, 


	INIT_LIST_HEAD(&buf->rb_mws);

	INIT_LIST_HEAD(&buf->rb_all);

	r = (struct rpcrdma_mw *)p;

	switch (ia->ri_memreg_strategy) {

	case RPCRDMA_FRMR:

		for (i = buf->rb_max_requests * RPCRDMA_MAX_SEGS; i; i--) {

			r->r.frmr.fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd,

						ia->ri_max_frmr_depth);

			if (IS_ERR(r->r.frmr.fr_mr)) {

				rc = PTR_ERR(r->r.frmr.fr_mr);

				dprintk("RPC:       %s: ib_alloc_fast_reg_mr"

					" failed %i\n", __func__, rc);

				goto out;

			}

			r->r.frmr.fr_pgl = ib_alloc_fast_reg_page_list(

						ia->ri_id->device,

						ia->ri_max_frmr_depth);

			if (IS_ERR(r->r.frmr.fr_pgl)) {

				rc = PTR_ERR(r->r.frmr.fr_pgl);

				dprintk("RPC:       %s: "

					"ib_alloc_fast_reg_page_list "

					"failed %i\n", __func__, rc);



				ib_dereg_mr(r->r.frmr.fr_mr);

		rc = rpcrdma_init_frmrs(ia, buf);

		if (rc)

			goto out;

			}

			list_add(&r->mw_all, &buf->rb_all);

			list_add(&r->mw_list, &buf->rb_mws);

			++r;

		}

		break;

	case RPCRDMA_MTHCAFMR:

		/* TBD we are perhaps overallocating here */

		for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {

			static struct ib_fmr_attr fa =

				{ RPCRDMA_MAX_DATA_SEGS, 1, PAGE_SHIFT };

			r->r.fmr = ib_alloc_fmr(ia->ri_pd,

				IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ,

				&fa);

			if (IS_ERR(r->r.fmr)) {

				rc = PTR_ERR(r->r.fmr);

				dprintk("RPC:       %s: ib_alloc_fmr"

					" failed %i\n", __func__, rc);

		rc = rpcrdma_init_fmrs(ia, buf);

		if (rc)

			goto out;

			}

			list_add(&r->mw_all, &buf->rb_all);

			list_add(&r->mw_list, &buf->rb_mws);

			++r;

		}

		break;

	default:

		break;
@@ -1189,24 +1217,57 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, 
	return rc;

}



/*

 * Unregister and destroy buffer memory. Need to deal with

 * partial initialization, so it's callable from failed create.

 * Must be called before destroying endpoint, as registrations

 * reference it.

 */

static void

rpcrdma_destroy_fmrs(struct rpcrdma_buffer *buf)

{

	struct rpcrdma_mw *r;

	int rc;



	while (!list_empty(&buf->rb_all)) {

		r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);

		list_del(&r->mw_all);

		list_del(&r->mw_list);



		rc = ib_dealloc_fmr(r->r.fmr);

		if (rc)

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

				__func__, rc);



		kfree(r);

	}

}



static void

rpcrdma_destroy_frmrs(struct rpcrdma_buffer *buf)

{

	struct rpcrdma_mw *r;

	int rc;



	while (!list_empty(&buf->rb_all)) {

		r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);

		list_del(&r->mw_all);

		list_del(&r->mw_list);



		rc = ib_dereg_mr(r->r.frmr.fr_mr);

		if (rc)

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

				__func__, rc);

		ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);



		kfree(r);

	}

}



void

rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)

{

	int rc, i;

	struct rpcrdma_ia *ia = rdmab_to_ia(buf);

	struct rpcrdma_mw *r;

	int i;



	/* clean up in reverse order from create

	 *   1.  recv mr memory (mr free, then kfree)

	 *   2.  send mr memory (mr free, then kfree)

	 *   3.  padding (if any) [moved to rpcrdma_ep_destroy]

	 *   4.  arrays

	 *   3.  MWs

	 */

	dprintk("RPC:       %s: entering\n", __func__);
@@ -1225,33 +1286,16 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) 
		}

	}



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

		r = list_entry(buf->rb_mws.next,

			struct rpcrdma_mw, mw_list);

		list_del(&r->mw_all);

		list_del(&r->mw_list);

	switch (ia->ri_memreg_strategy) {

	case RPCRDMA_FRMR:

			rc = ib_dereg_mr(r->r.frmr.fr_mr);

			if (rc)

				dprintk("RPC:       %s:"

					" ib_dereg_mr"

					" failed %i\n",

					__func__, rc);

			ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);

		rpcrdma_destroy_frmrs(buf);

		break;

	case RPCRDMA_MTHCAFMR:

			rc = ib_dealloc_fmr(r->r.fmr);

			if (rc)

				dprintk("RPC:       %s:"

					" ib_dealloc_fmr"

					" failed %i\n",

					__func__, rc);

		rpcrdma_destroy_fmrs(buf);

		break;

	default:

		break;

	}

	}



	kfree(buf->rb_pool);

}