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IB/iser: Enable iser when FMRs are not supported

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Reuse the "SG unaligned for FMR" driver flow to make the initiator
functional when running over driver instance which doesn't support
FMRs, such as a mlx4 virtual function.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Alex Tabachnik <alext@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Or Gerlitz 2013-02-21 14:50:10 +00:00 committed by Roland Dreier
parent 819a087316
commit 5525d210fd
2 changed files with 10 additions and 5 deletions
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7
drivers/infiniband/ulp/iser/iser_memory.c
View File

@ -369,10 +369,11 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task,
regd_buf = &iser_task->rdma_regd[cmd_dir];
aligned_len = iser_data_buf_aligned_len(mem, ibdev);
if (aligned_len != mem->dma_nents) {
if (aligned_len != mem->dma_nents ||
(!ib_conn->fmr_pool && mem->dma_nents > 1)) {
iscsi_conn->fmr_unalign_cnt++;
iser_warn("rdma alignment violation %d/%d aligned\n",
aligned_len, mem->size);
iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n",
aligned_len, mem->size);
iser_data_buf_dump(mem, ibdev);
/* unmap the command data before accessing it */

8
drivers/infiniband/ulp/iser/iser_verbs.c
View File

@ -242,10 +242,14 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
IB_ACCESS_REMOTE_READ);
ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, &params);
if (IS_ERR(ib_conn->fmr_pool)) {
ret = PTR_ERR(ib_conn->fmr_pool);
ret = PTR_ERR(ib_conn->fmr_pool);
if (IS_ERR(ib_conn->fmr_pool) && ret != -ENOSYS) {
ib_conn->fmr_pool = NULL;
goto out_err;
} else if (ret == -ENOSYS) {
ib_conn->fmr_pool = NULL;
iser_warn("FMRs are not supported, using unaligned mode\n");
ret = 0;
}
memset(&init_attr, 0, sizeof init_attr);