> >>> +struct qedr_mr *__qedr_alloc_mr(struct ib_pd *ibpd, int
> >>> +max_page_list_len) {
> >>> + struct qedr_pd *pd = get_qedr_pd(ibpd);
> >>> + struct qedr_dev *dev = get_qedr_dev(ibpd->device);
> >>> + struct qedr_mr *mr;
> >>> + int rc = -ENOMEM;
> >>> +
> >>> + DP_VERBOSE(dev, QEDR_MSG_MR,
> >>> + "qedr_alloc_frmr pd = %d max_page_list_len= %d\n", pd-
> >>> pd_id,
> >>> + max_page_list_len);
> >>> +
> >>> + mr = kzalloc(sizeof(*mr), GFP_KERNEL);
> >>> + if (!mr)
> >>> + return ERR_PTR(rc);
> >>> +
> >>> + mr->dev = dev;
> >>> + mr->type = QEDR_MR_FRMR;
> >>> +
> >>> + rc = init_mr_info(dev, &mr->info, max_page_list_len, 1);
> >>> + if (rc)
> >>> + goto err0;
> >>> +
> >>> + rc = dev->ops->rdma_alloc_tid(dev->rdma_ctx, &mr->hw_mr.itid);
> >>> + if (rc) {
> >>> + DP_ERR(dev, "roce alloc tid returned an error %d\n", rc);
> >>> + goto err0;
> >>> + }
> >>> +
> >>> + /* Index only, 18 bit long, lkey = itid << 8 | key */
> >>> + mr->hw_mr.tid_type = QED_RDMA_TID_FMR;
> >>> + mr->hw_mr.key = 0;
> >>> + mr->hw_mr.pd = pd->pd_id;
> >>
> >> Do you have a real MR<->PD association in HW? If so, can you point me
> >> to the code that binds it? If not, any reason not to expose the
> local_dma_lkey?
> >>
> > Yes, we send the pd id to the FW in function qed_rdma_register_tid.
>
> Right, thanks.
>
> > In any case, if we didn't have the association in HW Wouldn't the
> > local_dma_lkey be relevant only to dma_mr ? ( code snippet above
> > refers to FMR)
>
> I was just sticking to a location in the code where you associate MR<->PD...
>
> The local_dma_lkey is a special key that spans the entire memory space and
> unlike the notorious dma_mr, its not associated with a PD.
>
> See the code in ib_alloc_pd(), if the device does not support a single device
> local dma lkey, the core allocates a dma mr associated with the pd. If your
> device has such a key, you can save a dma mr allocation for each pd in the
> system.
Managed to miss this. Our device supports such a key, we'll add support.
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