Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 917 insertions, 0 deletions

diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c
new file mode 100644
index 000000000..8a1f2e285
--- /dev/null
+++ b/drivers/infiniband/sw/rdmavt/mr.c
@@ -0,0 +1,917 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2016 Intel Corporation.
+ */
+
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <rdma/ib_umem.h>
+#include <rdma/rdma_vt.h>
+#include "vt.h"
+#include "mr.h"
+#include "trace.h"
+
+/**
+ * rvt_driver_mr_init - Init MR resources per driver
+ * @rdi: rvt dev struct
+ *
+ * Do any intilization needed when a driver registers with rdmavt.
+ *
+ * Return: 0 on success or errno on failure
+ */
+int rvt_driver_mr_init(struct rvt_dev_info *rdi)
+{
+	unsigned int lkey_table_size = rdi->dparms.lkey_table_size;
+	unsigned lk_tab_size;
+	int i;
+
+	/*
+	 * The top hfi1_lkey_table_size bits are used to index the
+	 * table.  The lower 8 bits can be owned by the user (copied from
+	 * the LKEY).  The remaining bits act as a generation number or tag.
+	 */
+	if (!lkey_table_size)
+		return -EINVAL;
+
+	spin_lock_init(&rdi->lkey_table.lock);
+
+	/* ensure generation is at least 4 bits */
+	if (lkey_table_size > RVT_MAX_LKEY_TABLE_BITS) {
+		rvt_pr_warn(rdi, "lkey bits %u too large, reduced to %u\n",
+			    lkey_table_size, RVT_MAX_LKEY_TABLE_BITS);
+		rdi->dparms.lkey_table_size = RVT_MAX_LKEY_TABLE_BITS;
+		lkey_table_size = rdi->dparms.lkey_table_size;
+	}
+	rdi->lkey_table.max = 1 << lkey_table_size;
+	rdi->lkey_table.shift = 32 - lkey_table_size;
+	lk_tab_size = rdi->lkey_table.max * sizeof(*rdi->lkey_table.table);
+	rdi->lkey_table.table = (struct rvt_mregion __rcu **)
+			       vmalloc_node(lk_tab_size, rdi->dparms.node);
+	if (!rdi->lkey_table.table)
+		return -ENOMEM;
+
+	RCU_INIT_POINTER(rdi->dma_mr, NULL);
+	for (i = 0; i < rdi->lkey_table.max; i++)
+		RCU_INIT_POINTER(rdi->lkey_table.table[i], NULL);
+
+	rdi->dparms.props.max_mr = rdi->lkey_table.max;
+	return 0;
+}
+
+/**
+ * rvt_mr_exit - clean up MR
+ * @rdi: rvt dev structure
+ *
+ * called when drivers have unregistered or perhaps failed to register with us
+ */
+void rvt_mr_exit(struct rvt_dev_info *rdi)
+{
+	if (rdi->dma_mr)
+		rvt_pr_err(rdi, "DMA MR not null!\n");
+
+	vfree(rdi->lkey_table.table);
+}
+
+static void rvt_deinit_mregion(struct rvt_mregion *mr)
+{
+	int i = mr->mapsz;
+
+	mr->mapsz = 0;
+	while (i)
+		kfree(mr->map[--i]);
+	percpu_ref_exit(&mr->refcount);
+}
+
+static void __rvt_mregion_complete(struct percpu_ref *ref)
+{
+	struct rvt_mregion *mr = container_of(ref, struct rvt_mregion,
+					      refcount);
+
+	complete(&mr->comp);
+}
+
+static int rvt_init_mregion(struct rvt_mregion *mr, struct ib_pd *pd,
+			    int count, unsigned int percpu_flags)
+{
+	int m, i = 0;
+	struct rvt_dev_info *dev = ib_to_rvt(pd->device);
+
+	mr->mapsz = 0;
+	m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ;
+	for (; i < m; i++) {
+		mr->map[i] = kzalloc_node(sizeof(*mr->map[0]), GFP_KERNEL,
+					  dev->dparms.node);
+		if (!mr->map[i])
+			goto bail;
+		mr->mapsz++;
+	}
+	init_completion(&mr->comp);
+	/* count returning the ptr to user */
+	if (percpu_ref_init(&mr->refcount, &__rvt_mregion_complete,
+			    percpu_flags, GFP_KERNEL))
+		goto bail;
+
+	atomic_set(&mr->lkey_invalid, 0);
+	mr->pd = pd;
+	mr->max_segs = count;
+	return 0;
+bail:
+	rvt_deinit_mregion(mr);
+	return -ENOMEM;
+}
+
+/**
+ * rvt_alloc_lkey - allocate an lkey
+ * @mr: memory region that this lkey protects
+ * @dma_region: 0->normal key, 1->restricted DMA key
+ *
+ * Returns 0 if successful, otherwise returns -errno.
+ *
+ * Increments mr reference count as required.
+ *
+ * Sets the lkey field mr for non-dma regions.
+ *
+ */
+static int rvt_alloc_lkey(struct rvt_mregion *mr, int dma_region)
+{
+	unsigned long flags;
+	u32 r;
+	u32 n;
+	int ret = 0;
+	struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device);
+	struct rvt_lkey_table *rkt = &dev->lkey_table;
+
+	rvt_get_mr(mr);
+	spin_lock_irqsave(&rkt->lock, flags);
+
+	/* special case for dma_mr lkey == 0 */
+	if (dma_region) {
+		struct rvt_mregion *tmr;
+
+		tmr = rcu_access_pointer(dev->dma_mr);
+		if (!tmr) {
+			mr->lkey_published = 1;
+			/* Insure published written first */
+			rcu_assign_pointer(dev->dma_mr, mr);
+			rvt_get_mr(mr);
+		}
+		goto success;
+	}
+
+	/* Find the next available LKEY */
+	r = rkt->next;
+	n = r;
+	for (;;) {
+		if (!rcu_access_pointer(rkt->table[r]))
+			break;
+		r = (r + 1) & (rkt->max - 1);
+		if (r == n)
+			goto bail;
+	}
+	rkt->next = (r + 1) & (rkt->max - 1);
+	/*
+	 * Make sure lkey is never zero which is reserved to indicate an
+	 * unrestricted LKEY.
+	 */
+	rkt->gen++;
+	/*
+	 * bits are capped to ensure enough bits for generation number
+	 */
+	mr->lkey = (r << (32 - dev->dparms.lkey_table_size)) |
+		((((1 << (24 - dev->dparms.lkey_table_size)) - 1) & rkt->gen)
+		 << 8);
+	if (mr->lkey == 0) {
+		mr->lkey |= 1 << 8;
+		rkt->gen++;
+	}
+	mr->lkey_published = 1;
+	/* Insure published written first */
+	rcu_assign_pointer(rkt->table[r], mr);
+success:
+	spin_unlock_irqrestore(&rkt->lock, flags);
+out:
+	return ret;
+bail:
+	rvt_put_mr(mr);
+	spin_unlock_irqrestore(&rkt->lock, flags);
+	ret = -ENOMEM;
+	goto out;
+}
+
+/**
+ * rvt_free_lkey - free an lkey
+ * @mr: mr to free from tables
+ */
+static void rvt_free_lkey(struct rvt_mregion *mr)
+{
+	unsigned long flags;
+	u32 lkey = mr->lkey;
+	u32 r;
+	struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device);
+	struct rvt_lkey_table *rkt = &dev->lkey_table;
+	int freed = 0;
+
+	spin_lock_irqsave(&rkt->lock, flags);
+	if (!lkey) {
+		if (mr->lkey_published) {
+			mr->lkey_published = 0;
+			/* insure published is written before pointer */
+			rcu_assign_pointer(dev->dma_mr, NULL);
+			rvt_put_mr(mr);
+		}
+	} else {
+		if (!mr->lkey_published)
+			goto out;
+		r = lkey >> (32 - dev->dparms.lkey_table_size);
+		mr->lkey_published = 0;
+		/* insure published is written before pointer */
+		rcu_assign_pointer(rkt->table[r], NULL);
+	}
+	freed++;
+out:
+	spin_unlock_irqrestore(&rkt->lock, flags);
+	if (freed)
+		percpu_ref_kill(&mr->refcount);
+}
+
+static struct rvt_mr *__rvt_alloc_mr(int count, struct ib_pd *pd)
+{
+	struct rvt_mr *mr;
+	int rval = -ENOMEM;
+	int m;
+
+	/* Allocate struct plus pointers to first level page tables. */
+	m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ;
+	mr = kzalloc(struct_size(mr, mr.map, m), GFP_KERNEL);
+	if (!mr)
+		goto bail;
+
+	rval = rvt_init_mregion(&mr->mr, pd, count, 0);
+	if (rval)
+		goto bail;
+	/*
+	 * ib_reg_phys_mr() will initialize mr->ibmr except for
+	 * lkey and rkey.
+	 */
+	rval = rvt_alloc_lkey(&mr->mr, 0);
+	if (rval)
+		goto bail_mregion;
+	mr->ibmr.lkey = mr->mr.lkey;
+	mr->ibmr.rkey = mr->mr.lkey;
+done:
+	return mr;
+
+bail_mregion:
+	rvt_deinit_mregion(&mr->mr);
+bail:
+	kfree(mr);
+	mr = ERR_PTR(rval);
+	goto done;
+}
+
+static void __rvt_free_mr(struct rvt_mr *mr)
+{
+	rvt_free_lkey(&mr->mr);
+	rvt_deinit_mregion(&mr->mr);
+	kfree(mr);
+}
+
+/**
+ * rvt_get_dma_mr - get a DMA memory region
+ * @pd: protection domain for this memory region
+ * @acc: access flags
+ *
+ * Return: the memory region on success, otherwise returns an errno.
+ */
+struct ib_mr *rvt_get_dma_mr(struct ib_pd *pd, int acc)
+{
+	struct rvt_mr *mr;
+	struct ib_mr *ret;
+	int rval;
+
+	if (ibpd_to_rvtpd(pd)->user)
+		return ERR_PTR(-EPERM);
+
+	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+	if (!mr) {
+		ret = ERR_PTR(-ENOMEM);
+		goto bail;
+	}
+
+	rval = rvt_init_mregion(&mr->mr, pd, 0, 0);
+	if (rval) {
+		ret = ERR_PTR(rval);
+		goto bail;
+	}
+
+	rval = rvt_alloc_lkey(&mr->mr, 1);
+	if (rval) {
+		ret = ERR_PTR(rval);
+		goto bail_mregion;
+	}
+
+	mr->mr.access_flags = acc;
+	ret = &mr->ibmr;
+done:
+	return ret;
+
+bail_mregion:
+	rvt_deinit_mregion(&mr->mr);
+bail:
+	kfree(mr);
+	goto done;
+}
+
+/**
+ * rvt_reg_user_mr - register a userspace memory region
+ * @pd: protection domain for this memory region
+ * @start: starting userspace address
+ * @length: length of region to register
+ * @virt_addr: associated virtual address
+ * @mr_access_flags: access flags for this memory region
+ * @udata: unused by the driver
+ *
+ * Return: the memory region on success, otherwise returns an errno.
+ */
+struct ib_mr *rvt_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
+			      u64 virt_addr, int mr_access_flags,
+			      struct ib_udata *udata)
+{
+	struct rvt_mr *mr;
+	struct ib_umem *umem;
+	struct sg_page_iter sg_iter;
+	int n, m;
+	struct ib_mr *ret;
+
+	if (length == 0)
+		return ERR_PTR(-EINVAL);
+
+	umem = ib_umem_get(pd->device, start, length, mr_access_flags);
+	if (IS_ERR(umem))
+		return (void *)umem;
+
+	n = ib_umem_num_pages(umem);
+
+	mr = __rvt_alloc_mr(n, pd);
+	if (IS_ERR(mr)) {
+		ret = (struct ib_mr *)mr;
+		goto bail_umem;
+	}
+
+	mr->mr.user_base = start;
+	mr->mr.iova = virt_addr;
+	mr->mr.length = length;
+	mr->mr.offset = ib_umem_offset(umem);
+	mr->mr.access_flags = mr_access_flags;
+	mr->umem = umem;
+
+	mr->mr.page_shift = PAGE_SHIFT;
+	m = 0;
+	n = 0;
+	for_each_sgtable_page (&umem->sgt_append.sgt, &sg_iter, 0) {
+		void *vaddr;
+
+		vaddr = page_address(sg_page_iter_page(&sg_iter));
+		if (!vaddr) {
+			ret = ERR_PTR(-EINVAL);
+			goto bail_inval;
+		}
+		mr->mr.map[m]->segs[n].vaddr = vaddr;
+		mr->mr.map[m]->segs[n].length = PAGE_SIZE;
+		trace_rvt_mr_user_seg(&mr->mr, m, n, vaddr, PAGE_SIZE);
+		if (++n == RVT_SEGSZ) {
+			m++;
+			n = 0;
+		}
+	}
+	return &mr->ibmr;
+
+bail_inval:
+	__rvt_free_mr(mr);
+
+bail_umem:
+	ib_umem_release(umem);
+
+	return ret;
+}
+
+/**
+ * rvt_dereg_clean_qp_cb - callback from iterator
+ * @qp: the qp
+ * @v: the mregion (as u64)
+ *
+ * This routine fields the callback for all QPs and
+ * for QPs in the same PD as the MR will call the
+ * rvt_qp_mr_clean() to potentially cleanup references.
+ */
+static void rvt_dereg_clean_qp_cb(struct rvt_qp *qp, u64 v)
+{
+	struct rvt_mregion *mr = (struct rvt_mregion *)v;
+
+	/* skip PDs that are not ours */
+	if (mr->pd != qp->ibqp.pd)
+		return;
+	rvt_qp_mr_clean(qp, mr->lkey);
+}
+
+/**
+ * rvt_dereg_clean_qps - find QPs for reference cleanup
+ * @mr: the MR that is being deregistered
+ *
+ * This routine iterates RC QPs looking for references
+ * to the lkey noted in mr.
+ */
+static void rvt_dereg_clean_qps(struct rvt_mregion *mr)
+{
+	struct rvt_dev_info *rdi = ib_to_rvt(mr->pd->device);
+
+	rvt_qp_iter(rdi, (u64)mr, rvt_dereg_clean_qp_cb);
+}
+
+/**
+ * rvt_check_refs - check references
+ * @mr: the megion
+ * @t: the caller identification
+ *
+ * This routine checks MRs holding a reference during
+ * when being de-registered.
+ *
+ * If the count is non-zero, the code calls a clean routine then
+ * waits for the timeout for the count to zero.
+ */
+static int rvt_check_refs(struct rvt_mregion *mr, const char *t)
+{
+	unsigned long timeout;
+	struct rvt_dev_info *rdi = ib_to_rvt(mr->pd->device);
+
+	if (mr->lkey) {
+		/* avoid dma mr */
+		rvt_dereg_clean_qps(mr);
+		/* @mr was indexed on rcu protected @lkey_table */
+		synchronize_rcu();
+	}
+
+	timeout = wait_for_completion_timeout(&mr->comp, 5 * HZ);
+	if (!timeout) {
+		rvt_pr_err(rdi,
+			   "%s timeout mr %p pd %p lkey %x refcount %ld\n",
+			   t, mr, mr->pd, mr->lkey,
+			   atomic_long_read(&mr->refcount.data->count));
+		rvt_get_mr(mr);
+		return -EBUSY;
+	}
+	return 0;
+}
+
+/**
+ * rvt_mr_has_lkey - is MR
+ * @mr: the mregion
+ * @lkey: the lkey
+ */
+bool rvt_mr_has_lkey(struct rvt_mregion *mr, u32 lkey)
+{
+	return mr && lkey == mr->lkey;
+}
+
+/**
+ * rvt_ss_has_lkey - is mr in sge tests
+ * @ss: the sge state
+ * @lkey: the lkey
+ *
+ * This code tests for an MR in the indicated
+ * sge state.
+ */
+bool rvt_ss_has_lkey(struct rvt_sge_state *ss, u32 lkey)
+{
+	int i;
+	bool rval = false;
+
+	if (!ss->num_sge)
+		return rval;
+	/* first one */
+	rval = rvt_mr_has_lkey(ss->sge.mr, lkey);
+	/* any others */
+	for (i = 0; !rval && i < ss->num_sge - 1; i++)
+		rval = rvt_mr_has_lkey(ss->sg_list[i].mr, lkey);
+	return rval;
+}
+
+/**
+ * rvt_dereg_mr - unregister and free a memory region
+ * @ibmr: the memory region to free
+ * @udata: unused by the driver
+ *
+ * Note that this is called to free MRs created by rvt_get_dma_mr()
+ * or rvt_reg_user_mr().
+ *
+ * Returns 0 on success.
+ */
+int rvt_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
+{
+	struct rvt_mr *mr = to_imr(ibmr);
+	int ret;
+
+	rvt_free_lkey(&mr->mr);
+
+	rvt_put_mr(&mr->mr); /* will set completion if last */
+	ret = rvt_check_refs(&mr->mr, __func__);
+	if (ret)
+		goto out;
+	rvt_deinit_mregion(&mr->mr);
+	ib_umem_release(mr->umem);
+	kfree(mr);
+out:
+	return ret;
+}
+
+/**
+ * rvt_alloc_mr - Allocate a memory region usable with the
+ * @pd: protection domain for this memory region
+ * @mr_type: mem region type
+ * @max_num_sg: Max number of segments allowed
+ *
+ * Return: the memory region on success, otherwise return an errno.
+ */
+struct ib_mr *rvt_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
+			   u32 max_num_sg)
+{
+	struct rvt_mr *mr;
+
+	if (mr_type != IB_MR_TYPE_MEM_REG)
+		return ERR_PTR(-EINVAL);
+
+	mr = __rvt_alloc_mr(max_num_sg, pd);
+	if (IS_ERR(mr))
+		return (struct ib_mr *)mr;
+
+	return &mr->ibmr;
+}
+
+/**
+ * rvt_set_page - page assignment function called by ib_sg_to_pages
+ * @ibmr: memory region
+ * @addr: dma address of mapped page
+ *
+ * Return: 0 on success
+ */
+static int rvt_set_page(struct ib_mr *ibmr, u64 addr)
+{
+	struct rvt_mr *mr = to_imr(ibmr);
+	u32 ps = 1 << mr->mr.page_shift;
+	u32 mapped_segs = mr->mr.length >> mr->mr.page_shift;
+	int m, n;
+
+	if (unlikely(mapped_segs == mr->mr.max_segs))
+		return -ENOMEM;
+
+	m = mapped_segs / RVT_SEGSZ;
+	n = mapped_segs % RVT_SEGSZ;
+	mr->mr.map[m]->segs[n].vaddr = (void *)addr;
+	mr->mr.map[m]->segs[n].length = ps;
+	mr->mr.length += ps;
+	trace_rvt_mr_page_seg(&mr->mr, m, n, (void *)addr, ps);
+
+	return 0;
+}
+
+/**
+ * rvt_map_mr_sg - map sg list and set it the memory region
+ * @ibmr: memory region
+ * @sg: dma mapped scatterlist
+ * @sg_nents: number of entries in sg
+ * @sg_offset: offset in bytes into sg
+ *
+ * Overwrite rvt_mr length with mr length calculated by ib_sg_to_pages.
+ *
+ * Return: number of sg elements mapped to the memory region
+ */
+int rvt_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
+		  int sg_nents, unsigned int *sg_offset)
+{
+	struct rvt_mr *mr = to_imr(ibmr);
+	int ret;
+
+	mr->mr.length = 0;
+	mr->mr.page_shift = PAGE_SHIFT;
+	ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, rvt_set_page);
+	mr->mr.user_base = ibmr->iova;
+	mr->mr.iova = ibmr->iova;
+	mr->mr.offset = ibmr->iova - (u64)mr->mr.map[0]->segs[0].vaddr;
+	mr->mr.length = (size_t)ibmr->length;
+	trace_rvt_map_mr_sg(ibmr, sg_nents, sg_offset);
+	return ret;
+}
+
+/**
+ * rvt_fast_reg_mr - fast register physical MR
+ * @qp: the queue pair where the work request comes from
+ * @ibmr: the memory region to be registered
+ * @key: updated key for this memory region
+ * @access: access flags for this memory region
+ *
+ * Returns 0 on success.
+ */
+int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
+		    int access)
+{
+	struct rvt_mr *mr = to_imr(ibmr);
+
+	if (qp->ibqp.pd != mr->mr.pd)
+		return -EACCES;
+
+	/* not applicable to dma MR or user MR */
+	if (!mr->mr.lkey || mr->umem)
+		return -EINVAL;
+
+	if ((key & 0xFFFFFF00) != (mr->mr.lkey & 0xFFFFFF00))
+		return -EINVAL;
+
+	ibmr->lkey = key;
+	ibmr->rkey = key;
+	mr->mr.lkey = key;
+	mr->mr.access_flags = access;
+	mr->mr.iova = ibmr->iova;
+	atomic_set(&mr->mr.lkey_invalid, 0);
+
+	return 0;
+}
+EXPORT_SYMBOL(rvt_fast_reg_mr);
+
+/**
+ * rvt_invalidate_rkey - invalidate an MR rkey
+ * @qp: queue pair associated with the invalidate op
+ * @rkey: rkey to invalidate
+ *
+ * Returns 0 on success.
+ */
+int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey)
+{
+	struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device);
+	struct rvt_lkey_table *rkt = &dev->lkey_table;
+	struct rvt_mregion *mr;
+
+	if (rkey == 0)
+		return -EINVAL;
+
+	rcu_read_lock();
+	mr = rcu_dereference(
+		rkt->table[(rkey >> (32 - dev->dparms.lkey_table_size))]);
+	if (unlikely(!mr || mr->lkey != rkey || qp->ibqp.pd != mr->pd))
+		goto bail;
+
+	atomic_set(&mr->lkey_invalid, 1);
+	rcu_read_unlock();
+	return 0;
+
+bail:
+	rcu_read_unlock();
+	return -EINVAL;
+}
+EXPORT_SYMBOL(rvt_invalidate_rkey);
+
+/**
+ * rvt_sge_adjacent - is isge compressible
+ * @last_sge: last outgoing SGE written
+ * @sge: SGE to check
+ *
+ * If adjacent will update last_sge to add length.
+ *
+ * Return: true if isge is adjacent to last sge
+ */
+static inline bool rvt_sge_adjacent(struct rvt_sge *last_sge,
+				    struct ib_sge *sge)
+{
+	if (last_sge && sge->lkey == last_sge->mr->lkey &&
+	    ((uint64_t)(last_sge->vaddr + last_sge->length) == sge->addr)) {
+		if (sge->lkey) {
+			if (unlikely((sge->addr - last_sge->mr->user_base +
+			      sge->length > last_sge->mr->length)))
+				return false; /* overrun, caller will catch */
+		} else {
+			last_sge->length += sge->length;
+		}
+		last_sge->sge_length += sge->length;
+		trace_rvt_sge_adjacent(last_sge, sge);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * rvt_lkey_ok - check IB SGE for validity and initialize
+ * @rkt: table containing lkey to check SGE against
+ * @pd: protection domain
+ * @isge: outgoing internal SGE
+ * @last_sge: last outgoing SGE written
+ * @sge: SGE to check
+ * @acc: access flags
+ *
+ * Check the IB SGE for validity and initialize our internal version
+ * of it.
+ *
+ * Increments the reference count when a new sge is stored.
+ *
+ * Return: 0 if compressed, 1 if added , otherwise returns -errno.
+ */
+int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
+		struct rvt_sge *isge, struct rvt_sge *last_sge,
+		struct ib_sge *sge, int acc)
+{
+	struct rvt_mregion *mr;
+	unsigned n, m;
+	size_t off;
+
+	/*
+	 * We use LKEY == zero for kernel virtual addresses
+	 * (see rvt_get_dma_mr()).
+	 */
+	if (sge->lkey == 0) {
+		struct rvt_dev_info *dev = ib_to_rvt(pd->ibpd.device);
+
+		if (pd->user)
+			return -EINVAL;
+		if (rvt_sge_adjacent(last_sge, sge))
+			return 0;
+		rcu_read_lock();
+		mr = rcu_dereference(dev->dma_mr);
+		if (!mr)
+			goto bail;
+		rvt_get_mr(mr);
+		rcu_read_unlock();
+
+		isge->mr = mr;
+		isge->vaddr = (void *)sge->addr;
+		isge->length = sge->length;
+		isge->sge_length = sge->length;
+		isge->m = 0;
+		isge->n = 0;
+		goto ok;
+	}
+	if (rvt_sge_adjacent(last_sge, sge))
+		return 0;
+	rcu_read_lock();
+	mr = rcu_dereference(rkt->table[sge->lkey >> rkt->shift]);
+	if (!mr)
+		goto bail;
+	rvt_get_mr(mr);
+	if (!READ_ONCE(mr->lkey_published))
+		goto bail_unref;
+
+	if (unlikely(atomic_read(&mr->lkey_invalid) ||
+		     mr->lkey != sge->lkey || mr->pd != &pd->ibpd))
+		goto bail_unref;
+
+	off = sge->addr - mr->user_base;
+	if (unlikely(sge->addr < mr->user_base ||
+		     off + sge->length > mr->length ||
+		     (mr->access_flags & acc) != acc))
+		goto bail_unref;
+	rcu_read_unlock();
+
+	off += mr->offset;
+	if (mr->page_shift) {
+		/*
+		 * page sizes are uniform power of 2 so no loop is necessary
+		 * entries_spanned_by_off is the number of times the loop below
+		 * would have executed.
+		*/
+		size_t entries_spanned_by_off;
+
+		entries_spanned_by_off = off >> mr->page_shift;
+		off -= (entries_spanned_by_off << mr->page_shift);
+		m = entries_spanned_by_off / RVT_SEGSZ;
+		n = entries_spanned_by_off % RVT_SEGSZ;
+	} else {
+		m = 0;
+		n = 0;
+		while (off >= mr->map[m]->segs[n].length) {
+			off -= mr->map[m]->segs[n].length;
+			n++;
+			if (n >= RVT_SEGSZ) {
+				m++;
+				n = 0;
+			}
+		}
+	}
+	isge->mr = mr;
+	isge->vaddr = mr->map[m]->segs[n].vaddr + off;
+	isge->length = mr->map[m]->segs[n].length - off;
+	isge->sge_length = sge->length;
+	isge->m = m;
+	isge->n = n;
+ok:
+	trace_rvt_sge_new(isge, sge);
+	return 1;
+bail_unref:
+	rvt_put_mr(mr);
+bail:
+	rcu_read_unlock();
+	return -EINVAL;
+}
+EXPORT_SYMBOL(rvt_lkey_ok);
+
+/**
+ * rvt_rkey_ok - check the IB virtual address, length, and RKEY
+ * @qp: qp for validation
+ * @sge: SGE state
+ * @len: length of data
+ * @vaddr: virtual address to place data
+ * @rkey: rkey to check
+ * @acc: access flags
+ *
+ * Return: 1 if successful, otherwise 0.
+ *
+ * increments the reference count upon success
+ */
+int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
+		u32 len, u64 vaddr, u32 rkey, int acc)
+{
+	struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device);
+	struct rvt_lkey_table *rkt = &dev->lkey_table;
+	struct rvt_mregion *mr;
+	unsigned n, m;
+	size_t off;
+
+	/*
+	 * We use RKEY == zero for kernel virtual addresses
+	 * (see rvt_get_dma_mr()).
+	 */
+	rcu_read_lock();
+	if (rkey == 0) {
+		struct rvt_pd *pd = ibpd_to_rvtpd(qp->ibqp.pd);
+		struct rvt_dev_info *rdi = ib_to_rvt(pd->ibpd.device);
+
+		if (pd->user)
+			goto bail;
+		mr = rcu_dereference(rdi->dma_mr);
+		if (!mr)
+			goto bail;
+		rvt_get_mr(mr);
+		rcu_read_unlock();
+
+		sge->mr = mr;
+		sge->vaddr = (void *)vaddr;
+		sge->length = len;
+		sge->sge_length = len;
+		sge->m = 0;
+		sge->n = 0;
+		goto ok;
+	}
+
+	mr = rcu_dereference(rkt->table[rkey >> rkt->shift]);
+	if (!mr)
+		goto bail;
+	rvt_get_mr(mr);
+	/* insure mr read is before test */
+	if (!READ_ONCE(mr->lkey_published))
+		goto bail_unref;
+	if (unlikely(atomic_read(&mr->lkey_invalid) ||
+		     mr->lkey != rkey || qp->ibqp.pd != mr->pd))
+		goto bail_unref;
+
+	off = vaddr - mr->iova;
+	if (unlikely(vaddr < mr->iova || off + len > mr->length ||
+		     (mr->access_flags & acc) == 0))
+		goto bail_unref;
+	rcu_read_unlock();
+
+	off += mr->offset;
+	if (mr->page_shift) {
+		/*
+		 * page sizes are uniform power of 2 so no loop is necessary
+		 * entries_spanned_by_off is the number of times the loop below
+		 * would have executed.
+		*/
+		size_t entries_spanned_by_off;
+
+		entries_spanned_by_off = off >> mr->page_shift;
+		off -= (entries_spanned_by_off << mr->page_shift);
+		m = entries_spanned_by_off / RVT_SEGSZ;
+		n = entries_spanned_by_off % RVT_SEGSZ;
+	} else {
+		m = 0;
+		n = 0;
+		while (off >= mr->map[m]->segs[n].length) {
+			off -= mr->map[m]->segs[n].length;
+			n++;
+			if (n >= RVT_SEGSZ) {
+				m++;
+				n = 0;
+			}
+		}
+	}
+	sge->mr = mr;
+	sge->vaddr = mr->map[m]->segs[n].vaddr + off;
+	sge->length = mr->map[m]->segs[n].length - off;
+	sge->sge_length = len;
+	sge->m = m;
+	sge->n = n;
+ok:
+	return 1;
+bail_unref:
+	rvt_put_mr(mr);
+bail:
+	rcu_read_unlock();
+	return 0;
+}
+EXPORT_SYMBOL(rvt_rkey_ok);