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IB/iser: Don't register memory for all immediate data writes
When all the task data is sent as immediate data, we are allowed to use the local_dma_lkey as it is not sent to the wire. Signed-off-by: Jenny Derzhavetz <jennyf@mellanox.com> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -658,7 +658,8 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
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enum iser_data_dir cmd_dir);
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int iser_reg_rdma_mem(struct iscsi_iser_task *task,
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enum iser_data_dir dir);
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enum iser_data_dir dir,
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bool all_imm);
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void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
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enum iser_data_dir dir);
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@ -72,7 +72,7 @@ static int iser_prepare_read_cmd(struct iscsi_task *task)
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return err;
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}
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err = iser_reg_rdma_mem(iser_task, ISER_DIR_IN);
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err = iser_reg_rdma_mem(iser_task, ISER_DIR_IN, false);
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if (err) {
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iser_err("Failed to set up Data-IN RDMA\n");
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return err;
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@ -126,7 +126,8 @@ iser_prepare_write_cmd(struct iscsi_task *task,
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return err;
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}
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err = iser_reg_rdma_mem(iser_task, ISER_DIR_OUT);
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err = iser_reg_rdma_mem(iser_task, ISER_DIR_OUT,
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buf_out->data_len == imm_sz);
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if (err != 0) {
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iser_err("Failed to register write cmd RDMA mem\n");
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return err;
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@ -194,7 +194,11 @@ iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
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struct scatterlist *sg = mem->sg;
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reg->sge.lkey = device->pd->local_dma_lkey;
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reg->rkey = device->mr->rkey;
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/*
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* FIXME: rework the registration code path to differentiate
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* rkey/lkey use cases
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*/
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reg->rkey = device->mr ? device->mr->rkey : 0;
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reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]);
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reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);
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@ -503,7 +507,8 @@ iser_reg_data_sg(struct iscsi_iser_task *task,
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}
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int iser_reg_rdma_mem(struct iscsi_iser_task *task,
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enum iser_data_dir dir)
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enum iser_data_dir dir,
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bool all_imm)
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{
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struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
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struct iser_device *device = ib_conn->device;
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@ -514,8 +519,8 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *task,
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bool use_dma_key;
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int err;
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use_dma_key = (mem->dma_nents == 1 && !iser_always_reg &&
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scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL);
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use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
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scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
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if (!use_dma_key) {
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desc = device->reg_ops->reg_desc_get(ib_conn);
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