Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 579 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
new file mode 100644
index 000000000..379bc0dfc
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,579 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *	- Redistributions of source code must retain the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer.
+ *
+ *	- Redistributions in binary form must reproduce the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer in the documentation and/or other materials
+ *	  provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+
+#include "iscsi_iser.h"
+static
+int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
+		      struct iser_data_buf *mem,
+		      struct iser_reg_resources *rsc,
+		      struct iser_mem_reg *mem_reg);
+static
+int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
+		     struct iser_data_buf *mem,
+		     struct iser_reg_resources *rsc,
+		     struct iser_mem_reg *mem_reg);
+
+static const struct iser_reg_ops fastreg_ops = {
+	.alloc_reg_res	= iser_alloc_fastreg_pool,
+	.free_reg_res	= iser_free_fastreg_pool,
+	.reg_mem	= iser_fast_reg_mr,
+	.unreg_mem	= iser_unreg_mem_fastreg,
+	.reg_desc_get	= iser_reg_desc_get_fr,
+	.reg_desc_put	= iser_reg_desc_put_fr,
+};
+
+static const struct iser_reg_ops fmr_ops = {
+	.alloc_reg_res	= iser_alloc_fmr_pool,
+	.free_reg_res	= iser_free_fmr_pool,
+	.reg_mem	= iser_fast_reg_fmr,
+	.unreg_mem	= iser_unreg_mem_fmr,
+	.reg_desc_get	= iser_reg_desc_get_fmr,
+	.reg_desc_put	= iser_reg_desc_put_fmr,
+};
+
+void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+	iser_err_comp(wc, "memreg");
+}
+
+int iser_assign_reg_ops(struct iser_device *device)
+{
+	struct ib_device *ib_dev = device->ib_device;
+
+	/* Assign function handles  - based on FMR support */
+	if (ib_dev->alloc_fmr && ib_dev->dealloc_fmr &&
+	    ib_dev->map_phys_fmr && ib_dev->unmap_fmr) {
+		iser_info("FMR supported, using FMR for registration\n");
+		device->reg_ops = &fmr_ops;
+	} else if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
+		iser_info("FastReg supported, using FastReg for registration\n");
+		device->reg_ops = &fastreg_ops;
+		device->remote_inv_sup = iser_always_reg;
+	} else {
+		iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+struct iser_fr_desc *
+iser_reg_desc_get_fr(struct ib_conn *ib_conn)
+{
+	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+	struct iser_fr_desc *desc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fr_pool->lock, flags);
+	desc = list_first_entry(&fr_pool->list,
+				struct iser_fr_desc, list);
+	list_del(&desc->list);
+	spin_unlock_irqrestore(&fr_pool->lock, flags);
+
+	return desc;
+}
+
+void
+iser_reg_desc_put_fr(struct ib_conn *ib_conn,
+		     struct iser_fr_desc *desc)
+{
+	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fr_pool->lock, flags);
+	list_add(&desc->list, &fr_pool->list);
+	spin_unlock_irqrestore(&fr_pool->lock, flags);
+}
+
+struct iser_fr_desc *
+iser_reg_desc_get_fmr(struct ib_conn *ib_conn)
+{
+	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+
+	return list_first_entry(&fr_pool->list,
+				struct iser_fr_desc, list);
+}
+
+void
+iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
+		      struct iser_fr_desc *desc)
+{
+}
+
+static void iser_data_buf_dump(struct iser_data_buf *data,
+			       struct ib_device *ibdev)
+{
+	struct scatterlist *sg;
+	int i;
+
+	for_each_sg(data->sg, sg, data->dma_nents, i)
+		iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
+			 "off:0x%x sz:0x%x dma_len:0x%x\n",
+			 i, (unsigned long)ib_sg_dma_address(ibdev, sg),
+			 sg_page(sg), sg->offset,
+			 sg->length, ib_sg_dma_len(ibdev, sg));
+}
+
+static void iser_dump_page_vec(struct iser_page_vec *page_vec)
+{
+	int i;
+
+	iser_err("page vec npages %d data length %lld\n",
+		 page_vec->npages, page_vec->fake_mr.length);
+	for (i = 0; i < page_vec->npages; i++)
+		iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
+}
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+			    struct iser_data_buf *data,
+			    enum iser_data_dir iser_dir,
+			    enum dma_data_direction dma_dir)
+{
+	struct ib_device *dev;
+
+	iser_task->dir[iser_dir] = 1;
+	dev = iser_task->iser_conn->ib_conn.device->ib_device;
+
+	data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
+	if (data->dma_nents == 0) {
+		iser_err("dma_map_sg failed!!!\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+			      struct iser_data_buf *data,
+			      enum dma_data_direction dir)
+{
+	struct ib_device *dev;
+
+	dev = iser_task->iser_conn->ib_conn.device->ib_device;
+	ib_dma_unmap_sg(dev, data->sg, data->size, dir);
+}
+
+static int
+iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
+	     struct iser_mem_reg *reg)
+{
+	struct scatterlist *sg = mem->sg;
+
+	reg->sge.lkey = device->pd->local_dma_lkey;
+	/*
+	 * FIXME: rework the registration code path to differentiate
+	 * rkey/lkey use cases
+	 */
+
+	if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
+		reg->rkey = device->pd->unsafe_global_rkey;
+	else
+		reg->rkey = 0;
+	reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]);
+	reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);
+
+	iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
+		 " length=0x%x\n", reg->sge.lkey, reg->rkey,
+		 reg->sge.addr, reg->sge.length);
+
+	return 0;
+}
+
+static int iser_set_page(struct ib_mr *mr, u64 addr)
+{
+	struct iser_page_vec *page_vec =
+		container_of(mr, struct iser_page_vec, fake_mr);
+
+	page_vec->pages[page_vec->npages++] = addr;
+
+	return 0;
+}
+
+static
+int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
+		      struct iser_data_buf *mem,
+		      struct iser_reg_resources *rsc,
+		      struct iser_mem_reg *reg)
+{
+	struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+	struct iser_device *device = ib_conn->device;
+	struct iser_page_vec *page_vec = rsc->page_vec;
+	struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
+	struct ib_pool_fmr *fmr;
+	int ret, plen;
+
+	page_vec->npages = 0;
+	page_vec->fake_mr.page_size = SIZE_4K;
+	plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
+			      mem->dma_nents, NULL, iser_set_page);
+	if (unlikely(plen < mem->dma_nents)) {
+		iser_err("page vec too short to hold this SG\n");
+		iser_data_buf_dump(mem, device->ib_device);
+		iser_dump_page_vec(page_vec);
+		return -EINVAL;
+	}
+
+	fmr  = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
+				    page_vec->npages, page_vec->pages[0]);
+	if (IS_ERR(fmr)) {
+		ret = PTR_ERR(fmr);
+		iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
+		return ret;
+	}
+
+	reg->sge.lkey = fmr->fmr->lkey;
+	reg->rkey = fmr->fmr->rkey;
+	reg->sge.addr = page_vec->fake_mr.iova;
+	reg->sge.length = page_vec->fake_mr.length;
+	reg->mem_h = fmr;
+
+	iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
+		 " length=0x%x\n", reg->sge.lkey, reg->rkey,
+		 reg->sge.addr, reg->sge.length);
+
+	return 0;
+}
+
+/**
+ * Unregister (previosuly registered using FMR) memory.
+ * If memory is non-FMR does nothing.
+ */
+void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
+			enum iser_data_dir cmd_dir)
+{
+	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+	int ret;
+
+	if (!reg->mem_h)
+		return;
+
+	iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
+
+	ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
+	if (ret)
+		iser_err("ib_fmr_pool_unmap failed %d\n", ret);
+
+	reg->mem_h = NULL;
+}
+
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+			    enum iser_data_dir cmd_dir)
+{
+	struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+
+	if (!reg->mem_h)
+		return;
+
+	device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
+				     reg->mem_h);
+	reg->mem_h = NULL;
+}
+
+static void
+iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs,
+		    struct ib_sig_domain *domain)
+{
+	domain->sig_type = IB_SIG_TYPE_T10_DIF;
+	domain->sig.dif.pi_interval = scsi_prot_interval(sc);
+	domain->sig.dif.ref_tag = t10_pi_ref_tag(sc->request);
+	/*
+	 * At the moment we hard code those, but in the future
+	 * we will take them from sc.
+	 */
+	domain->sig.dif.apptag_check_mask = 0xffff;
+	domain->sig.dif.app_escape = true;
+	domain->sig.dif.ref_escape = true;
+	if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
+		domain->sig.dif.ref_remap = true;
+};
+
+static int
+iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
+{
+	switch (scsi_get_prot_op(sc)) {
+	case SCSI_PROT_WRITE_INSERT:
+	case SCSI_PROT_READ_STRIP:
+		sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
+		iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
+		sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+		break;
+	case SCSI_PROT_READ_INSERT:
+	case SCSI_PROT_WRITE_STRIP:
+		sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
+		iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
+		sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+						IB_T10DIF_CSUM : IB_T10DIF_CRC;
+		break;
+	case SCSI_PROT_READ_PASS:
+	case SCSI_PROT_WRITE_PASS:
+		iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
+		sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+		iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
+		sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+						IB_T10DIF_CSUM : IB_T10DIF_CRC;
+		break;
+	default:
+		iser_err("Unsupported PI operation %d\n",
+			 scsi_get_prot_op(sc));
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static inline void
+iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
+{
+	*mask = 0;
+	if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+		*mask |= IB_SIG_CHECK_REFTAG;
+	if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+		*mask |= IB_SIG_CHECK_GUARD;
+}
+
+static inline void
+iser_inv_rkey(struct ib_send_wr *inv_wr,
+	      struct ib_mr *mr,
+	      struct ib_cqe *cqe)
+{
+	inv_wr->opcode = IB_WR_LOCAL_INV;
+	inv_wr->wr_cqe = cqe;
+	inv_wr->ex.invalidate_rkey = mr->rkey;
+	inv_wr->send_flags = 0;
+	inv_wr->num_sge = 0;
+}
+
+static int
+iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
+		struct iser_pi_context *pi_ctx,
+		struct iser_mem_reg *data_reg,
+		struct iser_mem_reg *prot_reg,
+		struct iser_mem_reg *sig_reg)
+{
+	struct iser_tx_desc *tx_desc = &iser_task->desc;
+	struct ib_sig_attrs *sig_attrs = &tx_desc->sig_attrs;
+	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
+	struct ib_sig_handover_wr *wr;
+	struct ib_mr *mr = pi_ctx->sig_mr;
+	int ret;
+
+	memset(sig_attrs, 0, sizeof(*sig_attrs));
+	ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
+	if (ret)
+		goto err;
+
+	iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
+
+	if (pi_ctx->sig_mr_valid)
+		iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
+
+	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+	wr = container_of(iser_tx_next_wr(tx_desc), struct ib_sig_handover_wr,
+			  wr);
+	wr->wr.opcode = IB_WR_REG_SIG_MR;
+	wr->wr.wr_cqe = cqe;
+	wr->wr.sg_list = &data_reg->sge;
+	wr->wr.num_sge = 1;
+	wr->wr.send_flags = 0;
+	wr->sig_attrs = sig_attrs;
+	wr->sig_mr = mr;
+	if (scsi_prot_sg_count(iser_task->sc))
+		wr->prot = &prot_reg->sge;
+	else
+		wr->prot = NULL;
+	wr->access_flags = IB_ACCESS_LOCAL_WRITE |
+			   IB_ACCESS_REMOTE_READ |
+			   IB_ACCESS_REMOTE_WRITE;
+	pi_ctx->sig_mr_valid = 1;
+
+	sig_reg->sge.lkey = mr->lkey;
+	sig_reg->rkey = mr->rkey;
+	sig_reg->sge.addr = 0;
+	sig_reg->sge.length = scsi_transfer_length(iser_task->sc);
+
+	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
+		 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
+		 sig_reg->sge.length);
+err:
+	return ret;
+}
+
+static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
+			    struct iser_data_buf *mem,
+			    struct iser_reg_resources *rsc,
+			    struct iser_mem_reg *reg)
+{
+	struct iser_tx_desc *tx_desc = &iser_task->desc;
+	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
+	struct ib_mr *mr = rsc->mr;
+	struct ib_reg_wr *wr;
+	int n;
+
+	if (rsc->mr_valid)
+		iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
+
+	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+	n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SIZE_4K);
+	if (unlikely(n != mem->dma_nents)) {
+		iser_err("failed to map sg (%d/%d)\n",
+			 n, mem->dma_nents);
+		return n < 0 ? n : -EINVAL;
+	}
+
+	wr = container_of(iser_tx_next_wr(tx_desc), struct ib_reg_wr, wr);
+	wr->wr.opcode = IB_WR_REG_MR;
+	wr->wr.wr_cqe = cqe;
+	wr->wr.send_flags = 0;
+	wr->wr.num_sge = 0;
+	wr->mr = mr;
+	wr->key = mr->rkey;
+	wr->access = IB_ACCESS_LOCAL_WRITE  |
+		     IB_ACCESS_REMOTE_WRITE |
+		     IB_ACCESS_REMOTE_READ;
+
+	rsc->mr_valid = 1;
+
+	reg->sge.lkey = mr->lkey;
+	reg->rkey = mr->rkey;
+	reg->sge.addr = mr->iova;
+	reg->sge.length = mr->length;
+
+	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
+		 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
+
+	return 0;
+}
+
+static int
+iser_reg_prot_sg(struct iscsi_iser_task *task,
+		 struct iser_data_buf *mem,
+		 struct iser_fr_desc *desc,
+		 bool use_dma_key,
+		 struct iser_mem_reg *reg)
+{
+	struct iser_device *device = task->iser_conn->ib_conn.device;
+
+	if (use_dma_key)
+		return iser_reg_dma(device, mem, reg);
+
+	return device->reg_ops->reg_mem(task, mem, &desc->pi_ctx->rsc, reg);
+}
+
+static int
+iser_reg_data_sg(struct iscsi_iser_task *task,
+		 struct iser_data_buf *mem,
+		 struct iser_fr_desc *desc,
+		 bool use_dma_key,
+		 struct iser_mem_reg *reg)
+{
+	struct iser_device *device = task->iser_conn->ib_conn.device;
+
+	if (use_dma_key)
+		return iser_reg_dma(device, mem, reg);
+
+	return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
+}
+
+int iser_reg_rdma_mem(struct iscsi_iser_task *task,
+		      enum iser_data_dir dir,
+		      bool all_imm)
+{
+	struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
+	struct iser_device *device = ib_conn->device;
+	struct iser_data_buf *mem = &task->data[dir];
+	struct iser_mem_reg *reg = &task->rdma_reg[dir];
+	struct iser_mem_reg *data_reg;
+	struct iser_fr_desc *desc = NULL;
+	bool use_dma_key;
+	int err;
+
+	use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
+		      scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
+
+	if (!use_dma_key) {
+		desc = device->reg_ops->reg_desc_get(ib_conn);
+		reg->mem_h = desc;
+	}
+
+	if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL)
+		data_reg = reg;
+	else
+		data_reg = &task->desc.data_reg;
+
+	err = iser_reg_data_sg(task, mem, desc, use_dma_key, data_reg);
+	if (unlikely(err))
+		goto err_reg;
+
+	if (scsi_get_prot_op(task->sc) != SCSI_PROT_NORMAL) {
+		struct iser_mem_reg *prot_reg = &task->desc.prot_reg;
+
+		if (scsi_prot_sg_count(task->sc)) {
+			mem = &task->prot[dir];
+			err = iser_reg_prot_sg(task, mem, desc,
+					       use_dma_key, prot_reg);
+			if (unlikely(err))
+				goto err_reg;
+		}
+
+		err = iser_reg_sig_mr(task, desc->pi_ctx, data_reg,
+				      prot_reg, reg);
+		if (unlikely(err))
+			goto err_reg;
+
+		desc->pi_ctx->sig_protected = 1;
+	}
+
+	return 0;
+
+err_reg:
+	if (desc)
+		device->reg_ops->reg_desc_put(ib_conn, desc);
+
+	return err;
+}
+
+void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
+			 enum iser_data_dir dir)
+{
+	struct iser_device *device = task->iser_conn->ib_conn.device;
+
+	device->reg_ops->unreg_mem(task, dir);
+}