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Diffstat (limited to 'drivers/infiniband/ulp/iser/iser_memory.c')
-rw-r--r--drivers/infiniband/ulp/iser/iser_memory.c391
1 files changed, 391 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 0000000000..6efcb79c8e
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,391 @@
+/*
+ * 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/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+
+#include "iscsi_iser.h"
+
+void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ iser_err_comp(wc, "memreg");
+}
+
+static 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;
+}
+
+static 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);
+}
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct iser_data_buf *data = &iser_task->data[iser_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 (unlikely(data->dma_nents == 0)) {
+ iser_err("dma_map_sg failed!!!\n");
+ return -EINVAL;
+ }
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
+
+ pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir);
+ if (unlikely(pdata->dma_nents == 0)) {
+ iser_err("protection dma_map_sg failed!!!\n");
+ goto out_unmap;
+ }
+ }
+
+ return 0;
+
+out_unmap:
+ ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
+ return -EINVAL;
+}
+
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct iser_data_buf *data = &iser_task->data[iser_dir];
+ struct ib_device *dev;
+
+ dev = iser_task->iser_conn->ib_conn.device->ib_device;
+ ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
+
+ ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_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 = sg_dma_address(&sg[0]);
+ reg->sge.length = sg_dma_len(&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;
+}
+
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+ struct iser_fr_desc *desc;
+ struct ib_mr_status mr_status;
+
+ desc = reg->desc;
+ if (!desc)
+ return;
+
+ /*
+ * The signature MR cannot be invalidated and reused without checking.
+ * libiscsi calls the check_protection transport handler only if
+ * SCSI-Response is received. And the signature MR is not checked if
+ * the task is completed for some other reason like a timeout or error
+ * handling. That's why we must check the signature MR here before
+ * putting it to the free pool.
+ */
+ if (unlikely(desc->sig_protected)) {
+ desc->sig_protected = false;
+ ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS,
+ &mr_status);
+ }
+ iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc);
+ reg->desc = NULL;
+}
+
+static void iser_set_dif_domain(struct scsi_cmnd *sc,
+ 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(scsi_cmd_to_rq(sc));
+ /*
+ * 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->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->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->wire);
+ sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+ iser_set_dif_domain(sc, &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, struct ib_send_wr *next_wr)
+{
+ 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;
+ inv_wr->next = next_wr;
+}
+
+static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ struct iser_data_buf *sig_mem,
+ struct iser_reg_resources *rsc,
+ struct iser_mem_reg *sig_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->sig_mr;
+ struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
+ struct ib_reg_wr *wr = &tx_desc->reg_wr;
+ 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 (rsc->sig_mr->need_inval)
+ iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
+
+ ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+ ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
+ sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
+ if (unlikely(ret)) {
+ iser_err("failed to map PI sg (%d)\n",
+ mem->dma_nents + sig_mem->dma_nents);
+ goto err;
+ }
+
+ memset(wr, 0, sizeof(*wr));
+ wr->wr.next = &tx_desc->send_wr;
+ wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
+ wr->wr.wr_cqe = cqe;
+ wr->wr.num_sge = 0;
+ wr->wr.send_flags = 0;
+ wr->mr = mr;
+ wr->key = mr->rkey;
+ wr->access = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE;
+ rsc->sig_mr->need_inval = true;
+
+ sig_reg->sge.lkey = mr->lkey;
+ sig_reg->rkey = mr->rkey;
+ sig_reg->sge.addr = mr->iova;
+ sig_reg->sge.length = mr->length;
+
+ 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 = &tx_desc->reg_wr;
+ int n;
+
+ if (rsc->mr->need_inval)
+ iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
+
+ ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+ n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SZ_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->wr.next = &tx_desc->send_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->need_inval = true;
+
+ 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;
+}
+
+int iser_reg_mem_fastreg(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_fr_desc *desc;
+ 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)
+ return iser_reg_dma(device, mem, reg);
+
+ desc = iser_reg_desc_get_fr(ib_conn);
+ if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
+ err = iser_fast_reg_mr(task, mem, &desc->rsc, reg);
+ if (unlikely(err))
+ goto err_reg;
+ } else {
+ err = iser_reg_sig_mr(task, mem, &task->prot[dir],
+ &desc->rsc, reg);
+ if (unlikely(err))
+ goto err_reg;
+
+ desc->sig_protected = true;
+ }
+
+ reg->desc = desc;
+
+ return 0;
+
+err_reg:
+ iser_reg_desc_put_fr(ib_conn, desc);
+
+ return err;
+}