[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / sunrpc / xprtrdma / fmr_ops.c

/*
 * Copyright (c) 2015 Oracle.  All rights reserved.
 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
 */

/* Lightweight memory registration using Fast Memory Regions (FMR).
 * Referred to sometimes as MTHCAFMR mode.
 *
 * FMR uses synchronous memory registration and deregistration.
 * FMR registration is known to be fast, but FMR deregistration
 * can take tens of usecs to complete.
 */

/* Normal operation
 *
 * A Memory Region is prepared for RDMA READ or WRITE using the
 * ib_map_phys_fmr verb (fmr_op_map). When the RDMA operation is
 * finished, the Memory Region is unmapped using the ib_unmap_fmr
 * verb (fmr_op_unmap).
 */

#include "xprt_rdma.h"

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY	RPCDBG_TRANS
#endif

/* Maximum scatter/gather per FMR */
#define RPCRDMA_MAX_FMR_SGES	(64)

/* Access mode of externally registered pages */
enum {
	RPCRDMA_FMR_ACCESS_FLAGS	= IB_ACCESS_REMOTE_WRITE |
					  IB_ACCESS_REMOTE_READ,
};

bool
fmr_is_supported(struct rpcrdma_ia *ia)
{
	if (!ia->ri_device->alloc_fmr) {
		pr_info("rpcrdma: 'fmr' mode is not supported by device %s\n",
			ia->ri_device->name);
		return false;
	}
	return true;
}

static int
fmr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mw *mw)
{
	static struct ib_fmr_attr fmr_attr = {
		.max_pages	= RPCRDMA_MAX_FMR_SGES,
		.max_maps	= 1,
		.page_shift	= PAGE_SHIFT
	};

	mw->fmr.fm_physaddrs = kcalloc(RPCRDMA_MAX_FMR_SGES,
				       sizeof(u64), GFP_KERNEL);
	if (!mw->fmr.fm_physaddrs)
		goto out_free;

	mw->mw_sg = kcalloc(RPCRDMA_MAX_FMR_SGES,
			    sizeof(*mw->mw_sg), GFP_KERNEL);
	if (!mw->mw_sg)
		goto out_free;

	sg_init_table(mw->mw_sg, RPCRDMA_MAX_FMR_SGES);

	mw->fmr.fm_mr = ib_alloc_fmr(ia->ri_pd, RPCRDMA_FMR_ACCESS_FLAGS,
				     &fmr_attr);
	if (IS_ERR(mw->fmr.fm_mr))
		goto out_fmr_err;

	return 0;

out_fmr_err:
	dprintk("RPC:       %s: ib_alloc_fmr returned %ld\n", __func__,
		PTR_ERR(mw->fmr.fm_mr));

out_free:
	kfree(mw->mw_sg);
	kfree(mw->fmr.fm_physaddrs);
	return -ENOMEM;
}

static int
__fmr_unmap(struct rpcrdma_mw *mw)
{
	LIST_HEAD(l);
	int rc;

	list_add(&mw->fmr.fm_mr->list, &l);
	rc = ib_unmap_fmr(&l);
	list_del_init(&mw->fmr.fm_mr->list);
	return rc;
}

static void
fmr_op_release_mr(struct rpcrdma_mw *r)
{
	LIST_HEAD(unmap_list);
	int rc;

	/* Ensure MW is not on any rl_registered list */
	if (!list_empty(&r->mw_list))
		list_del(&r->mw_list);

	kfree(r->fmr.fm_physaddrs);
	kfree(r->mw_sg);

	/* In case this one was left mapped, try to unmap it
	 * to prevent dealloc_fmr from failing with EBUSY
	 */
	rc = __fmr_unmap(r);
	if (rc)
		pr_err("rpcrdma: final ib_unmap_fmr for %p failed %i\n",
		       r, rc);

	rc = ib_dealloc_fmr(r->fmr.fm_mr);
	if (rc)
		pr_err("rpcrdma: final ib_dealloc_fmr for %p returned %i\n",
		       r, rc);

	kfree(r);
}

/* Reset of a single FMR.
 */
static void
fmr_op_recover_mr(struct rpcrdma_mw *mw)
{
	struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
	int rc;

	/* ORDER: invalidate first */
	rc = __fmr_unmap(mw);

	/* ORDER: then DMA unmap */
	ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
			mw->mw_sg, mw->mw_nents, mw->mw_dir);
	if (rc)
		goto out_release;

	rpcrdma_put_mw(r_xprt, mw);
	r_xprt->rx_stats.mrs_recovered++;
	return;

out_release:
	pr_err("rpcrdma: FMR reset failed (%d), %p released\n", rc, mw);
	r_xprt->rx_stats.mrs_orphaned++;

	spin_lock(&r_xprt->rx_buf.rb_mwlock);
	list_del(&mw->mw_all);
	spin_unlock(&r_xprt->rx_buf.rb_mwlock);

	fmr_op_release_mr(mw);
}

static int
fmr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
	    struct rpcrdma_create_data_internal *cdata)
{
	rpcrdma_set_max_header_sizes(ia, cdata, max_t(unsigned int, 1,
						      RPCRDMA_MAX_DATA_SEGS /
						      RPCRDMA_MAX_FMR_SGES));
	return 0;
}

/* FMR mode conveys up to 64 pages of payload per chunk segment.
 */
static size_t
fmr_op_maxpages(struct rpcrdma_xprt *r_xprt)
{
	return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
		     RPCRDMA_MAX_HDR_SEGS * RPCRDMA_MAX_FMR_SGES);
}

/* Use the ib_map_phys_fmr() verb to register a memory region
 * for remote access via RDMA READ or RDMA WRITE.
 */
static int
fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
	   int nsegs, bool writing, struct rpcrdma_mw **out)
{
	struct rpcrdma_mr_seg *seg1 = seg;
	int len, pageoff, i, rc;
	struct rpcrdma_mw *mw;
	u64 *dma_pages;

	mw = rpcrdma_get_mw(r_xprt);
	if (!mw)
		return -ENOBUFS;

	pageoff = offset_in_page(seg1->mr_offset);
	seg1->mr_offset -= pageoff;	/* start of page */
	seg1->mr_len += pageoff;
	len = -pageoff;
	if (nsegs > RPCRDMA_MAX_FMR_SGES)
		nsegs = RPCRDMA_MAX_FMR_SGES;
	for (i = 0; i < nsegs;) {
		if (seg->mr_page)
			sg_set_page(&mw->mw_sg[i],
				    seg->mr_page,
				    seg->mr_len,
				    offset_in_page(seg->mr_offset));
		else
			sg_set_buf(&mw->mw_sg[i], seg->mr_offset,
				   seg->mr_len);
		len += seg->mr_len;
		++seg;
		++i;
		/* Check for holes */
		if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
		    offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
			break;
	}
	mw->mw_nents = i;
	mw->mw_dir = rpcrdma_data_dir(writing);
	if (i == 0)
		goto out_dmamap_err;

	if (!ib_dma_map_sg(r_xprt->rx_ia.ri_device,
			   mw->mw_sg, mw->mw_nents, mw->mw_dir))
		goto out_dmamap_err;

	for (i = 0, dma_pages = mw->fmr.fm_physaddrs; i < mw->mw_nents; i++)
		dma_pages[i] = sg_dma_address(&mw->mw_sg[i]);
	rc = ib_map_phys_fmr(mw->fmr.fm_mr, dma_pages, mw->mw_nents,
			     dma_pages[0]);
	if (rc)
		goto out_maperr;

	mw->mw_handle = mw->fmr.fm_mr->rkey;
	mw->mw_length = len;
	mw->mw_offset = dma_pages[0] + pageoff;

	*out = mw;
	return mw->mw_nents;

out_dmamap_err:
	pr_err("rpcrdma: failed to dma map sg %p sg_nents %u\n",
	       mw->mw_sg, mw->mw_nents);
	rpcrdma_defer_mr_recovery(mw);
	return -EIO;

out_maperr:
	pr_err("rpcrdma: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n",
	       len, (unsigned long long)dma_pages[0],
	       pageoff, mw->mw_nents, rc);
	rpcrdma_defer_mr_recovery(mw);
	return -EIO;
}

/* Invalidate all memory regions that were registered for "req".
 *
 * Sleeps until it is safe for the host CPU to access the
 * previously mapped memory regions.
 *
 * Caller ensures that req->rl_registered is not empty.
 */
static void
fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
{
	struct rpcrdma_mw *mw, *tmp;
	LIST_HEAD(unmap_list);
	int rc;

	dprintk("RPC:       %s: req %p\n", __func__, req);

	/* ORDER: Invalidate all of the req's MRs first
	 *
	 * ib_unmap_fmr() is slow, so use a single call instead
	 * of one call per mapped FMR.
	 */
	list_for_each_entry(mw, &req->rl_registered, mw_list)
		list_add_tail(&mw->fmr.fm_mr->list, &unmap_list);
	rc = ib_unmap_fmr(&unmap_list);
	if (rc)
		goto out_reset;

	/* ORDER: Now DMA unmap all of the req's MRs, and return
	 * them to the free MW list.
	 */
	list_for_each_entry_safe(mw, tmp, &req->rl_registered, mw_list) {
		list_del_init(&mw->mw_list);
		list_del_init(&mw->fmr.fm_mr->list);
		ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
				mw->mw_sg, mw->mw_nents, mw->mw_dir);
		rpcrdma_put_mw(r_xprt, mw);
	}

	return;

out_reset:
	pr_err("rpcrdma: ib_unmap_fmr failed (%i)\n", rc);

	list_for_each_entry_safe(mw, tmp, &req->rl_registered, mw_list) {
		list_del_init(&mw->fmr.fm_mr->list);
		fmr_op_recover_mr(mw);
	}
}

/* Use a slow, safe mechanism to invalidate all memory regions
 * that were registered for "req".
 */
static void
fmr_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
		  bool sync)
{
	struct rpcrdma_mw *mw;

	while (!list_empty(&req->rl_registered)) {
		mw = list_first_entry(&req->rl_registered,
				      struct rpcrdma_mw, mw_list);
		list_del_init(&mw->mw_list);

		if (sync)
			fmr_op_recover_mr(mw);
		else
			rpcrdma_defer_mr_recovery(mw);
	}
}

const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
	.ro_map				= fmr_op_map,
	.ro_unmap_sync			= fmr_op_unmap_sync,
	.ro_unmap_safe			= fmr_op_unmap_safe,
	.ro_recover_mr			= fmr_op_recover_mr,
	.ro_open			= fmr_op_open,
	.ro_maxpages			= fmr_op_maxpages,
	.ro_init_mr			= fmr_op_init_mr,
	.ro_release_mr			= fmr_op_release_mr,
	.ro_displayname			= "fmr",
};
Commit	Line	Data
a0ce85f5 CL	1	/*
	2	* Copyright (c) 2015 Oracle. All rights reserved.
	3	* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
	4	*/
	5
	6	/* Lightweight memory registration using Fast Memory Regions (FMR).
	7	* Referred to sometimes as MTHCAFMR mode.
	8	*
	9	* FMR uses synchronous memory registration and deregistration.
	10	* FMR registration is known to be fast, but FMR deregistration
	11	* can take tens of usecs to complete.
	12	*/
	13
fc7fbb59 CL	14	/* Normal operation
	15	*
	16	* A Memory Region is prepared for RDMA READ or WRITE using the
	17	* ib_map_phys_fmr verb (fmr_op_map). When the RDMA operation is
	18	* finished, the Memory Region is unmapped using the ib_unmap_fmr
	19	* verb (fmr_op_unmap).
	20	*/
	21
a0ce85f5 CL	22	#include "xprt_rdma.h"
	23
	24	#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
	25	# define RPCDBG_FACILITY RPCDBG_TRANS
	26	#endif
	27
1c9351ee CL	28	/* Maximum scatter/gather per FMR */
	29	#define RPCRDMA_MAX_FMR_SGES (64)
	30
d48b1d29 CL	31	/* Access mode of externally registered pages */
	32	enum {
	33	RPCRDMA_FMR_ACCESS_FLAGS = IB_ACCESS_REMOTE_WRITE \|
	34	IB_ACCESS_REMOTE_READ,
	35	};
	36
b54054ca CL	37	bool
	38	fmr_is_supported(struct rpcrdma_ia *ia)
	39	{
	40	if (!ia->ri_device->alloc_fmr) {
	41	pr_info("rpcrdma: 'fmr' mode is not supported by device %s\n",
	42	ia->ri_device->name);
	43	return false;
	44	}
	45	return true;
	46	}
	47
d48b1d29	48	static int
e2ac236c	49	fmr_op_init_mr(struct rpcrdma_ia ia, struct rpcrdma_mw mw)
d48b1d29 CL	50	{
	51	static struct ib_fmr_attr fmr_attr = {
	52	.max_pages = RPCRDMA_MAX_FMR_SGES,
	53	.max_maps = 1,
	54	.page_shift = PAGE_SHIFT
	55	};
	56
88975ebe CL	57	mw->fmr.fm_physaddrs = kcalloc(RPCRDMA_MAX_FMR_SGES,
	58	sizeof(u64), GFP_KERNEL);
	59	if (!mw->fmr.fm_physaddrs)
d48b1d29 CL	60	goto out_free;
	61
	62	mw->mw_sg = kcalloc(RPCRDMA_MAX_FMR_SGES,
	63	sizeof(*mw->mw_sg), GFP_KERNEL);
	64	if (!mw->mw_sg)
	65	goto out_free;
	66
	67	sg_init_table(mw->mw_sg, RPCRDMA_MAX_FMR_SGES);
	68
e2ac236c	69	mw->fmr.fm_mr = ib_alloc_fmr(ia->ri_pd, RPCRDMA_FMR_ACCESS_FLAGS,
88975ebe CL	70	&fmr_attr);
88975ebe CL	71	if (IS_ERR(mw->fmr.fm_mr))
d48b1d29 CL	72	goto out_fmr_err;
	73
	74	return 0;
	75
	76	out_fmr_err:
	77	dprintk("RPC: %s: ib_alloc_fmr returned %ld\n", __func__,
88975ebe	78	PTR_ERR(mw->fmr.fm_mr));
d48b1d29 CL	79
	80	out_free:
	81	kfree(mw->mw_sg);
88975ebe	82	kfree(mw->fmr.fm_physaddrs);
d48b1d29 CL	83	return -ENOMEM;
	84	}
	85
ead3f26e CL	86	static int
	87	__fmr_unmap(struct rpcrdma_mw *mw)
	88	{
	89	LIST_HEAD(l);
38f1932e	90	int rc;
ead3f26e	91
88975ebe	92	list_add(&mw->fmr.fm_mr->list, &l);
38f1932e	93	rc = ib_unmap_fmr(&l);
88975ebe	94	list_del_init(&mw->fmr.fm_mr->list);
38f1932e	95	return rc;
ead3f26e CL	96	}
ead3f26e CL	97
d48b1d29	98	static void
e2ac236c	99	fmr_op_release_mr(struct rpcrdma_mw *r)
d48b1d29	100	{
505bbe64	101	LIST_HEAD(unmap_list);
d48b1d29 CL	102	int rc;
d48b1d29 CL	103
9d6b0409 CL	104	/* Ensure MW is not on any rl_registered list */
	105	if (!list_empty(&r->mw_list))
	106	list_del(&r->mw_list);
	107
88975ebe	108	kfree(r->fmr.fm_physaddrs);
d48b1d29 CL	109	kfree(r->mw_sg);
d48b1d29 CL	110
505bbe64 CL	111	/* In case this one was left mapped, try to unmap it
	112	* to prevent dealloc_fmr from failing with EBUSY
	113	*/
	114	rc = __fmr_unmap(r);
	115	if (rc)
	116	pr_err("rpcrdma: final ib_unmap_fmr for %p failed %i\n",
	117	r, rc);
	118
88975ebe	119	rc = ib_dealloc_fmr(r->fmr.fm_mr);
d48b1d29 CL	120	if (rc)
	121	pr_err("rpcrdma: final ib_dealloc_fmr for %p returned %i\n",
	122	r, rc);
e2ac236c CL	123
e2ac236c CL	124	kfree(r);
d48b1d29 CL	125	}
d48b1d29 CL	126
505bbe64	127	/* Reset of a single FMR.
ead3f26e CL	128	*/
ead3f26e CL	129	static void
505bbe64	130	fmr_op_recover_mr(struct rpcrdma_mw *mw)
ead3f26e	131	{
505bbe64 CL	132	struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
505bbe64 CL	133	int rc;
ead3f26e	134
505bbe64 CL	135	/* ORDER: invalidate first */
505bbe64 CL	136	rc = __fmr_unmap(mw);
ead3f26e	137
505bbe64 CL	138	/* ORDER: then DMA unmap */
	139	ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
	140	mw->mw_sg, mw->mw_nents, mw->mw_dir);
2ffc871a CL	141	if (rc)
2ffc871a CL	142	goto out_release;
505bbe64 CL	143
	144	rpcrdma_put_mw(r_xprt, mw);
	145	r_xprt->rx_stats.mrs_recovered++;
2ffc871a CL	146	return;
	147
	148	out_release:
	149	pr_err("rpcrdma: FMR reset failed (%d), %p released\n", rc, mw);
	150	r_xprt->rx_stats.mrs_orphaned++;
	151
	152	spin_lock(&r_xprt->rx_buf.rb_mwlock);
	153	list_del(&mw->mw_all);
	154	spin_unlock(&r_xprt->rx_buf.rb_mwlock);
	155
	156	fmr_op_release_mr(mw);
ead3f26e CL	157	}
ead3f26e CL	158
3968cb58 CL	159	static int
	160	fmr_op_open(struct rpcrdma_ia ia, struct rpcrdma_ep ep,
	161	struct rpcrdma_create_data_internal *cdata)
	162	{
302d3deb CL	163	rpcrdma_set_max_header_sizes(ia, cdata, max_t(unsigned int, 1,
	164	RPCRDMA_MAX_DATA_SEGS /
	165	RPCRDMA_MAX_FMR_SGES));
3968cb58 CL	166	return 0;
	167	}
	168
1c9351ee CL	169	/* FMR mode conveys up to 64 pages of payload per chunk segment.
	170	*/
	171	static size_t
	172	fmr_op_maxpages(struct rpcrdma_xprt *r_xprt)
	173	{
	174	return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
94931746	175	RPCRDMA_MAX_HDR_SEGS * RPCRDMA_MAX_FMR_SGES);
1c9351ee CL	176	}
1c9351ee CL	177
9c1b4d77 CL	178	/* Use the ib_map_phys_fmr() verb to register a memory region
	179	* for remote access via RDMA READ or RDMA WRITE.
	180	*/
	181	static int
	182	fmr_op_map(struct rpcrdma_xprt r_xprt, struct rpcrdma_mr_seg seg,
9d6b0409	183	int nsegs, bool writing, struct rpcrdma_mw **out)
9c1b4d77	184	{
9c1b4d77	185	struct rpcrdma_mr_seg *seg1 = seg;
9c1b4d77	186	int len, pageoff, i, rc;
fc7fbb59	187	struct rpcrdma_mw *mw;
fcdfb968	188	u64 *dma_pages;
fc7fbb59	189
505bbe64 CL	190	mw = rpcrdma_get_mw(r_xprt);
505bbe64 CL	191	if (!mw)
7a89f9c6	192	return -ENOBUFS;
9c1b4d77 CL	193
	194	pageoff = offset_in_page(seg1->mr_offset);
	195	seg1->mr_offset -= pageoff; /* start of page */
	196	seg1->mr_len += pageoff;
	197	len = -pageoff;
	198	if (nsegs > RPCRDMA_MAX_FMR_SGES)
	199	nsegs = RPCRDMA_MAX_FMR_SGES;
	200	for (i = 0; i < nsegs;) {
fcdfb968 CL	201	if (seg->mr_page)
	202	sg_set_page(&mw->mw_sg[i],
	203	seg->mr_page,
	204	seg->mr_len,
	205	offset_in_page(seg->mr_offset));
	206	else
	207	sg_set_buf(&mw->mw_sg[i], seg->mr_offset,
	208	seg->mr_len);
9c1b4d77 CL	209	len += seg->mr_len;
	210	++seg;
	211	++i;
	212	/* Check for holes */
	213	if ((i < nsegs && offset_in_page(seg->mr_offset)) \|\|
	214	offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
	215	break;
	216	}
fcdfb968 CL	217	mw->mw_nents = i;
fcdfb968 CL	218	mw->mw_dir = rpcrdma_data_dir(writing);
a54d4059 CL	219	if (i == 0)
a54d4059 CL	220	goto out_dmamap_err;
fcdfb968 CL	221
	222	if (!ib_dma_map_sg(r_xprt->rx_ia.ri_device,
	223	mw->mw_sg, mw->mw_nents, mw->mw_dir))
	224	goto out_dmamap_err;
9c1b4d77	225
fcdfb968 CL	226	for (i = 0, dma_pages = mw->fmr.fm_physaddrs; i < mw->mw_nents; i++)
	227	dma_pages[i] = sg_dma_address(&mw->mw_sg[i]);
	228	rc = ib_map_phys_fmr(mw->fmr.fm_mr, dma_pages, mw->mw_nents,
	229	dma_pages[0]);
9c1b4d77 CL	230	if (rc)
	231	goto out_maperr;
	232
9d6b0409 CL	233	mw->mw_handle = mw->fmr.fm_mr->rkey;
	234	mw->mw_length = len;
	235	mw->mw_offset = dma_pages[0] + pageoff;
	236
	237	*out = mw;
fcdfb968 CL	238	return mw->mw_nents;
	239
	240	out_dmamap_err:
	241	pr_err("rpcrdma: failed to dma map sg %p sg_nents %u\n",
	242	mw->mw_sg, mw->mw_nents);
42fe28f6	243	rpcrdma_defer_mr_recovery(mw);
7a89f9c6	244	return -EIO;
9c1b4d77 CL	245
9c1b4d77 CL	246	out_maperr:
fcdfb968 CL	247	pr_err("rpcrdma: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n",
	248	len, (unsigned long long)dma_pages[0],
	249	pageoff, mw->mw_nents, rc);
505bbe64	250	rpcrdma_defer_mr_recovery(mw);
7a89f9c6	251	return -EIO;
9c1b4d77 CL	252	}
9c1b4d77 CL	253
7c7a5390 CL	254	/* Invalidate all memory regions that were registered for "req".
	255	*
	256	* Sleeps until it is safe for the host CPU to access the
	257	* previously mapped memory regions.
9d6b0409 CL	258	*
9d6b0409 CL	259	* Caller ensures that req->rl_registered is not empty.
7c7a5390 CL	260	*/
	261	static void
	262	fmr_op_unmap_sync(struct rpcrdma_xprt r_xprt, struct rpcrdma_req req)
	263	{
9d6b0409	264	struct rpcrdma_mw mw, tmp;
7c7a5390 CL	265	LIST_HEAD(unmap_list);
	266	int rc;
	267
	268	dprintk("RPC: %s: req %p\n", __func__, req);
	269
	270	/* ORDER: Invalidate all of the req's MRs first
	271	*
	272	* ib_unmap_fmr() is slow, so use a single call instead
505bbe64	273	* of one call per mapped FMR.
7c7a5390	274	*/
9d6b0409	275	list_for_each_entry(mw, &req->rl_registered, mw_list)
88975ebe	276	list_add_tail(&mw->fmr.fm_mr->list, &unmap_list);
7c7a5390 CL	277	rc = ib_unmap_fmr(&unmap_list);
7c7a5390 CL	278	if (rc)
505bbe64	279	goto out_reset;
7c7a5390 CL	280
	281	/* ORDER: Now DMA unmap all of the req's MRs, and return
	282	* them to the free MW list.
	283	*/
9d6b0409 CL	284	list_for_each_entry_safe(mw, tmp, &req->rl_registered, mw_list) {
9d6b0409 CL	285	list_del_init(&mw->mw_list);
88975ebe	286	list_del_init(&mw->fmr.fm_mr->list);
505bbe64 CL	287	ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
	288	mw->mw_sg, mw->mw_nents, mw->mw_dir);
	289	rpcrdma_put_mw(r_xprt, mw);
7c7a5390 CL	290	}
7c7a5390 CL	291
505bbe64 CL	292	return;
	293
	294	out_reset:
	295	pr_err("rpcrdma: ib_unmap_fmr failed (%i)\n", rc);
	296
9d6b0409	297	list_for_each_entry_safe(mw, tmp, &req->rl_registered, mw_list) {
505bbe64 CL	298	list_del_init(&mw->fmr.fm_mr->list);
505bbe64 CL	299	fmr_op_recover_mr(mw);
505bbe64	300	}
7c7a5390 CL	301	}
7c7a5390 CL	302
ead3f26e CL	303	/* Use a slow, safe mechanism to invalidate all memory regions
ead3f26e CL	304	* that were registered for "req".
ead3f26e CL	305	*/
	306	static void
	307	fmr_op_unmap_safe(struct rpcrdma_xprt r_xprt, struct rpcrdma_req req,
	308	bool sync)
	309	{
ead3f26e	310	struct rpcrdma_mw *mw;
ead3f26e	311
9d6b0409 CL	312	while (!list_empty(&req->rl_registered)) {
	313	mw = list_first_entry(&req->rl_registered,
	314	struct rpcrdma_mw, mw_list);
	315	list_del_init(&mw->mw_list);
ead3f26e	316
fcdfb968	317	if (sync)
505bbe64	318	fmr_op_recover_mr(mw);
fcdfb968	319	else
505bbe64	320	rpcrdma_defer_mr_recovery(mw);
ead3f26e CL	321	}
	322	}
	323
a0ce85f5	324	const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
9c1b4d77	325	.ro_map = fmr_op_map,
7c7a5390	326	.ro_unmap_sync = fmr_op_unmap_sync,
ead3f26e	327	.ro_unmap_safe = fmr_op_unmap_safe,
505bbe64	328	.ro_recover_mr = fmr_op_recover_mr,
3968cb58	329	.ro_open = fmr_op_open,
1c9351ee	330	.ro_maxpages = fmr_op_maxpages,
e2ac236c CL	331	.ro_init_mr = fmr_op_init_mr,
e2ac236c CL	332	.ro_release_mr = fmr_op_release_mr,
a0ce85f5 CL	333	.ro_displayname = "fmr",
a0ce85f5 CL	334	};