-/**
- * iser_reg_rdma_mem_fmr - Registers memory intended for RDMA,
- * using FMR (if possible) obtaining rkey and va
- *
- * returns 0 on success, errno code on failure
- */
-int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *iser_task,
- enum iser_data_dir cmd_dir)
-{
- struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
- struct iser_device *device = ib_conn->device;
- struct ib_device *ibdev = device->ib_device;
- struct iser_data_buf *mem = &iser_task->data[cmd_dir];
- struct iser_mem_reg *mem_reg;
- int aligned_len;
- int err;
- int i;
-
- mem_reg = &iser_task->rdma_reg[cmd_dir];
-
- aligned_len = iser_data_buf_aligned_len(mem, ibdev);
- if (aligned_len != mem->dma_nents) {
- err = fall_to_bounce_buf(iser_task, mem,
- cmd_dir, aligned_len);
- if (err) {
- iser_err("failed to allocate bounce buffer\n");
- return err;
- }
- }
-
- /* if there a single dma entry, FMR is not needed */
- if (mem->dma_nents == 1) {
- return iser_reg_dma(device, mem, mem_reg);
- } else { /* use FMR for multiple dma entries */
- err = iser_reg_page_vec(iser_task, mem, ib_conn->fmr.page_vec,
- mem_reg);
- if (err && err != -EAGAIN) {
- iser_data_buf_dump(mem, ibdev);
- iser_err("mem->dma_nents = %d (dlength = 0x%x)\n",
- mem->dma_nents,
- ntoh24(iser_task->desc.iscsi_header.dlength));
- iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n",
- ib_conn->fmr.page_vec->data_size,
- ib_conn->fmr.page_vec->length,
- ib_conn->fmr.page_vec->offset);
- for (i = 0; i < ib_conn->fmr.page_vec->length; i++)
- iser_err("page_vec[%d] = 0x%llx\n", i,
- (unsigned long long)ib_conn->fmr.page_vec->pages[i]);
- }
- if (err)
- return err;
- }
- return 0;
-}
-