From: Zhu Yanjun <yanjun.zhu@xxxxxxxxx> This is a followup to the EFA dmabuf[1]. Irdma driver currently does not support on-demand-paging(ODP). So it uses habanalabs as the dmabuf exporter, and irdma as the importer to allow for peer2peer access through libibverbs. In this commit, the function ib_umem_dmabuf_get_pinned() is used. This function is introduced in EFA dmabuf[1] which allows the driver to get a dmabuf umem which is pinned and does not require move_notify callback implementation. The returned umem is pinned and DMA mapped like standard cpu umems, and is released through ib_umem_release(). [1]https://lore.kernel.org/lkml/20211007114018.GD2688930@xxxxxxxx/t/ Signed-off-by: Zhu Yanjun <yanjun.zhu@xxxxxxxxx> --- V1->V2: Thanks Shiraz Saleem, he gave me a lot of good suggestions. This commit is based on the shared functions from refactored irdma_reg_user_mr. --- drivers/infiniband/hw/irdma/verbs.c | 43 +++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c index 6982f38596c8..a638861689c2 100644 --- a/drivers/infiniband/hw/irdma/verbs.c +++ b/drivers/infiniband/hw/irdma/verbs.c @@ -2977,6 +2977,48 @@ static struct ib_mr *irdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 len, return ERR_PTR(err); } +static struct ib_mr *irdma_reg_user_mr_dmabuf(struct ib_pd *pd, u64 start, + u64 len, u64 virt, + int fd, int access, + struct ib_udata *udata) +{ + struct irdma_device *iwdev = to_iwdev(pd->device); + struct ib_umem_dmabuf *umem_dmabuf = NULL; + struct irdma_mr *iwmr = NULL; + int err; + + if (len > iwdev->rf->sc_dev.hw_attrs.max_mr_size) + return ERR_PTR(-EINVAL); + + if (udata->inlen < IRDMA_MEM_REG_MIN_REQ_LEN) + return ERR_PTR(-EINVAL); + + umem_dmabuf = ib_umem_dmabuf_get_pinned(pd->device, start, len, fd, access); + if (IS_ERR(umem_dmabuf)) { + err = PTR_ERR(umem_dmabuf); + ibdev_dbg(&iwdev->ibdev, "Failed to get dmabuf umem[%d]\n", err); + return ERR_PTR(err); + } + + iwmr = irdma_alloc_iwmr(&umem_dmabuf->umem, pd, virt, IRDMA_MEMREG_TYPE_MEM); + if (IS_ERR(iwmr)) { + ib_umem_release(&umem_dmabuf->umem); + return (struct ib_mr *)iwmr; + } + + err = irdma_reg_user_mr_type_mem(iwmr, access); + if (err) + goto error; + + return &iwmr->ibmr; + +error: + irdma_free_iwmr(iwmr); + ib_umem_release(&umem_dmabuf->umem); + + return ERR_PTR(err); +} + /** * irdma_reg_phys_mr - register kernel physical memory * @pd: ibpd pointer @@ -4483,6 +4525,7 @@ static const struct ib_device_ops irdma_dev_ops = { .query_port = irdma_query_port, .query_qp = irdma_query_qp, .reg_user_mr = irdma_reg_user_mr, + .reg_user_mr_dmabuf = irdma_reg_user_mr_dmabuf, .req_notify_cq = irdma_req_notify_cq, .resize_cq = irdma_resize_cq, INIT_RDMA_OBJ_SIZE(ib_pd, irdma_pd, ibpd), -- 2.27.0
