Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 333 insertions, 0 deletions

diff --git a/drivers/infiniband/sw/rxe/rxe_mw.c b/drivers/infiniband/sw/rxe/rxe_mw.c
new file mode 100644
index 000000000..cebc9f0f4
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_mw.c
@@ -0,0 +1,333 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2020 Hewlett Packard Enterprise, Inc. All rights reserved.
+ */
+
+/*
+ * The rdma_rxe driver supports type 1 or type 2B memory windows.
+ * Type 1 MWs are created by ibv_alloc_mw() verbs calls and bound by
+ * ibv_bind_mw() calls. Type 2 MWs are also created by ibv_alloc_mw()
+ * but bound by bind_mw work requests. The ibv_bind_mw() call is converted
+ * by libibverbs to a bind_mw work request.
+ */
+
+#include "rxe.h"
+
+int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata)
+{
+	struct rxe_mw *mw = to_rmw(ibmw);
+	struct rxe_pd *pd = to_rpd(ibmw->pd);
+	struct rxe_dev *rxe = to_rdev(ibmw->device);
+	int ret;
+
+	rxe_get(pd);
+
+	ret = rxe_add_to_pool(&rxe->mw_pool, mw);
+	if (ret) {
+		rxe_put(pd);
+		return ret;
+	}
+
+	mw->rkey = ibmw->rkey = (mw->elem.index << 8) | rxe_get_next_key(-1);
+	mw->state = (mw->ibmw.type == IB_MW_TYPE_2) ?
+			RXE_MW_STATE_FREE : RXE_MW_STATE_VALID;
+	spin_lock_init(&mw->lock);
+
+	rxe_finalize(mw);
+
+	return 0;
+}
+
+int rxe_dealloc_mw(struct ib_mw *ibmw)
+{
+	struct rxe_mw *mw = to_rmw(ibmw);
+
+	rxe_cleanup(mw);
+
+	return 0;
+}
+
+static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+			 struct rxe_mw *mw, struct rxe_mr *mr, int access)
+{
+	if (mw->ibmw.type == IB_MW_TYPE_1) {
+		if (unlikely(mw->state != RXE_MW_STATE_VALID)) {
+			rxe_dbg_mw(mw,
+				"attempt to bind a type 1 MW not in the valid state\n");
+			return -EINVAL;
+		}
+
+		/* o10-36.2.2 */
+		if (unlikely((access & IB_ZERO_BASED))) {
+			rxe_dbg_mw(mw, "attempt to bind a zero based type 1 MW\n");
+			return -EINVAL;
+		}
+	}
+
+	if (mw->ibmw.type == IB_MW_TYPE_2) {
+		/* o10-37.2.30 */
+		if (unlikely(mw->state != RXE_MW_STATE_FREE)) {
+			rxe_dbg_mw(mw,
+				"attempt to bind a type 2 MW not in the free state\n");
+			return -EINVAL;
+		}
+
+		/* C10-72 */
+		if (unlikely(qp->pd != to_rpd(mw->ibmw.pd))) {
+			rxe_dbg_mw(mw,
+				"attempt to bind type 2 MW with qp with different PD\n");
+			return -EINVAL;
+		}
+
+		/* o10-37.2.40 */
+		if (unlikely(!mr || wqe->wr.wr.mw.length == 0)) {
+			rxe_dbg_mw(mw,
+				"attempt to invalidate type 2 MW by binding with NULL or zero length MR\n");
+			return -EINVAL;
+		}
+	}
+
+	/* remaining checks only apply to a nonzero MR */
+	if (!mr)
+		return 0;
+
+	if (unlikely(mr->access & IB_ZERO_BASED)) {
+		rxe_dbg_mw(mw, "attempt to bind MW to zero based MR\n");
+		return -EINVAL;
+	}
+
+	/* C10-73 */
+	if (unlikely(!(mr->access & IB_ACCESS_MW_BIND))) {
+		rxe_dbg_mw(mw,
+			"attempt to bind an MW to an MR without bind access\n");
+		return -EINVAL;
+	}
+
+	/* C10-74 */
+	if (unlikely((access &
+		      (IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC)) &&
+		     !(mr->access & IB_ACCESS_LOCAL_WRITE))) {
+		rxe_dbg_mw(mw,
+			"attempt to bind an Writable MW to an MR without local write access\n");
+		return -EINVAL;
+	}
+
+	/* C10-75 */
+	if (access & IB_ZERO_BASED) {
+		if (unlikely(wqe->wr.wr.mw.length > mr->ibmr.length)) {
+			rxe_dbg_mw(mw,
+				"attempt to bind a ZB MW outside of the MR\n");
+			return -EINVAL;
+		}
+	} else {
+		if (unlikely((wqe->wr.wr.mw.addr < mr->ibmr.iova) ||
+			     ((wqe->wr.wr.mw.addr + wqe->wr.wr.mw.length) >
+			      (mr->ibmr.iova + mr->ibmr.length)))) {
+			rxe_dbg_mw(mw,
+				"attempt to bind a VA MW outside of the MR\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static void rxe_do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+		      struct rxe_mw *mw, struct rxe_mr *mr, int access)
+{
+	u32 key = wqe->wr.wr.mw.rkey & 0xff;
+
+	mw->rkey = (mw->rkey & ~0xff) | key;
+	mw->access = access;
+	mw->state = RXE_MW_STATE_VALID;
+	mw->addr = wqe->wr.wr.mw.addr;
+	mw->length = wqe->wr.wr.mw.length;
+
+	if (mw->mr) {
+		rxe_put(mw->mr);
+		atomic_dec(&mw->mr->num_mw);
+		mw->mr = NULL;
+	}
+
+	if (mw->length) {
+		mw->mr = mr;
+		atomic_inc(&mr->num_mw);
+		rxe_get(mr);
+	}
+
+	if (mw->ibmw.type == IB_MW_TYPE_2) {
+		rxe_get(qp);
+		mw->qp = qp;
+	}
+}
+
+int rxe_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
+{
+	int ret;
+	struct rxe_mw *mw;
+	struct rxe_mr *mr;
+	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+	u32 mw_rkey = wqe->wr.wr.mw.mw_rkey;
+	u32 mr_lkey = wqe->wr.wr.mw.mr_lkey;
+	int access = wqe->wr.wr.mw.access;
+
+	mw = rxe_pool_get_index(&rxe->mw_pool, mw_rkey >> 8);
+	if (unlikely(!mw)) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (unlikely(mw->rkey != mw_rkey)) {
+		ret = -EINVAL;
+		goto err_drop_mw;
+	}
+
+	if (likely(wqe->wr.wr.mw.length)) {
+		mr = rxe_pool_get_index(&rxe->mr_pool, mr_lkey >> 8);
+		if (unlikely(!mr)) {
+			ret = -EINVAL;
+			goto err_drop_mw;
+		}
+
+		if (unlikely(mr->lkey != mr_lkey)) {
+			ret = -EINVAL;
+			goto err_drop_mr;
+		}
+	} else {
+		mr = NULL;
+	}
+
+	spin_lock_bh(&mw->lock);
+
+	ret = rxe_check_bind_mw(qp, wqe, mw, mr, access);
+	if (ret)
+		goto err_unlock;
+
+	rxe_do_bind_mw(qp, wqe, mw, mr, access);
+err_unlock:
+	spin_unlock_bh(&mw->lock);
+err_drop_mr:
+	if (mr)
+		rxe_put(mr);
+err_drop_mw:
+	rxe_put(mw);
+err:
+	return ret;
+}
+
+static int rxe_check_invalidate_mw(struct rxe_qp *qp, struct rxe_mw *mw)
+{
+	if (unlikely(mw->state == RXE_MW_STATE_INVALID))
+		return -EINVAL;
+
+	/* o10-37.2.26 */
+	if (unlikely(mw->ibmw.type == IB_MW_TYPE_1))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void rxe_do_invalidate_mw(struct rxe_mw *mw)
+{
+	struct rxe_qp *qp;
+	struct rxe_mr *mr;
+
+	/* valid type 2 MW will always have a QP pointer */
+	qp = mw->qp;
+	mw->qp = NULL;
+	rxe_put(qp);
+
+	/* valid type 2 MW will always have an MR pointer */
+	mr = mw->mr;
+	mw->mr = NULL;
+	atomic_dec(&mr->num_mw);
+	rxe_put(mr);
+
+	mw->access = 0;
+	mw->addr = 0;
+	mw->length = 0;
+	mw->state = RXE_MW_STATE_FREE;
+}
+
+int rxe_invalidate_mw(struct rxe_qp *qp, u32 rkey)
+{
+	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+	struct rxe_mw *mw;
+	int ret;
+
+	mw = rxe_pool_get_index(&rxe->mw_pool, rkey >> 8);
+	if (!mw) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (rkey != mw->rkey) {
+		ret = -EINVAL;
+		goto err_drop_ref;
+	}
+
+	spin_lock_bh(&mw->lock);
+
+	ret = rxe_check_invalidate_mw(qp, mw);
+	if (ret)
+		goto err_unlock;
+
+	rxe_do_invalidate_mw(mw);
+err_unlock:
+	spin_unlock_bh(&mw->lock);
+err_drop_ref:
+	rxe_put(mw);
+err:
+	return ret;
+}
+
+struct rxe_mw *rxe_lookup_mw(struct rxe_qp *qp, int access, u32 rkey)
+{
+	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+	struct rxe_pd *pd = to_rpd(qp->ibqp.pd);
+	struct rxe_mw *mw;
+	int index = rkey >> 8;
+
+	mw = rxe_pool_get_index(&rxe->mw_pool, index);
+	if (!mw)
+		return NULL;
+
+	if (unlikely((mw->rkey != rkey) || rxe_mw_pd(mw) != pd ||
+		     (mw->ibmw.type == IB_MW_TYPE_2 && mw->qp != qp) ||
+		     (mw->length == 0) ||
+		     (access && !(access & mw->access)) ||
+		     mw->state != RXE_MW_STATE_VALID)) {
+		rxe_put(mw);
+		return NULL;
+	}
+
+	return mw;
+}
+
+void rxe_mw_cleanup(struct rxe_pool_elem *elem)
+{
+	struct rxe_mw *mw = container_of(elem, typeof(*mw), elem);
+	struct rxe_pd *pd = to_rpd(mw->ibmw.pd);
+
+	rxe_put(pd);
+
+	if (mw->mr) {
+		struct rxe_mr *mr = mw->mr;
+
+		mw->mr = NULL;
+		atomic_dec(&mr->num_mw);
+		rxe_put(mr);
+	}
+
+	if (mw->qp) {
+		struct rxe_qp *qp = mw->qp;
+
+		mw->qp = NULL;
+		rxe_put(qp);
+	}
+
+	mw->access = 0;
+	mw->addr = 0;
+	mw->length = 0;
+	mw->state = RXE_MW_STATE_INVALID;
+}