#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
-/**
- * Decrements the reference count for the
- * registered buffer & releases it
- *
- * returns 0 if released, 1 if deferred
- */
-int iser_regd_buff_release(struct iser_regd_buf *regd_buf)
-{
- struct ib_device *dev;
-
- if ((atomic_read(®d_buf->ref_count) == 0) ||
- atomic_dec_and_test(®d_buf->ref_count)) {
- /* if we used the dma mr, unreg is just NOP */
- if (regd_buf->reg.is_fmr)
- iser_unreg_mem(®d_buf->reg);
-
- if (regd_buf->dma_addr) {
- dev = regd_buf->device->ib_device;
- ib_dma_unmap_single(dev,
- regd_buf->dma_addr,
- regd_buf->data_size,
- regd_buf->direction);
- }
- /* else this regd buf is associated with task which we */
- /* dma_unmap_single/sg later */
- return 0;
- } else {
- iser_dbg("Release deferred, regd.buff: 0x%p\n", regd_buf);
- return 1;
- }
-}
-
-/**
- * iser_reg_single - fills registered buffer descriptor with
- * registration information
- */
-void iser_reg_single(struct iser_device *device,
- struct iser_regd_buf *regd_buf,
- enum dma_data_direction direction)
-{
- u64 dma_addr;
-
- dma_addr = ib_dma_map_single(device->ib_device,
- regd_buf->virt_addr,
- regd_buf->data_size, direction);
- BUG_ON(ib_dma_mapping_error(device->ib_device, dma_addr));
-
- regd_buf->reg.lkey = device->mr->lkey;
- regd_buf->reg.len = regd_buf->data_size;
- regd_buf->reg.va = dma_addr;
- regd_buf->reg.is_fmr = 0;
-
- regd_buf->dma_addr = dma_addr;
- regd_buf->direction = direction;
-}
-
/**
* iser_start_rdma_unaligned_sg
*/
return err;
}
}
-
- /* take a reference on this regd buf such that it will not be released *
- * (eg in send dto completion) before we get the scsi response */
- atomic_inc(®d_buf->ref_count);
return 0;
}