> Subject: [PATCH rdma-next 02/13] RDMA/mana_ib: implement get_dma_mr
>
> From: Konstantin Taranov <kotara...@microsoft.com>
>
> Implement allocation of DMA-mapped memory regions.
>
> Signed-off-by: Konstantin Taranov <kotara...@microsoft.com>
> Reviewed-by: Shiraz Saleem <shirazsal...@microsoft.com>
Reviewed-by: Long Li <lon...@microsoft.com>
> ---
> drivers/infiniband/hw/mana/device.c | 1 +
> drivers/infiniband/hw/mana/mr.c | 36 +++++++++++++++++++++++++++++
> include/net/mana/gdma.h | 5 ++++
> 3 files changed, 42 insertions(+)
>
> diff --git a/drivers/infiniband/hw/mana/device.c
> b/drivers/infiniband/hw/mana/device.c
> index 7ac0191..215dbce 100644
> --- a/drivers/infiniband/hw/mana/device.c
> +++ b/drivers/infiniband/hw/mana/device.c
> @@ -32,6 +32,7 @@ static const struct ib_device_ops mana_ib_dev_ops = {
> .destroy_rwq_ind_table = mana_ib_destroy_rwq_ind_table,
> .destroy_wq = mana_ib_destroy_wq,
> .disassociate_ucontext = mana_ib_disassociate_ucontext,
> + .get_dma_mr = mana_ib_get_dma_mr,
> .get_link_layer = mana_ib_get_link_layer,
> .get_port_immutable = mana_ib_get_port_immutable,
> .mmap = mana_ib_mmap,
> diff --git a/drivers/infiniband/hw/mana/mr.c b/drivers/infiniband/hw/mana/mr.c
> index 887b09d..3a047f8 100644
> --- a/drivers/infiniband/hw/mana/mr.c
> +++ b/drivers/infiniband/hw/mana/mr.c
> @@ -8,6 +8,8 @@
> #define VALID_MR_FLAGS
> \
> (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE |
> IB_ACCESS_REMOTE_READ)
>
> +#define VALID_DMA_MR_FLAGS (IB_ACCESS_LOCAL_WRITE)
> +
> static enum gdma_mr_access_flags
> mana_ib_verbs_to_gdma_access_flags(int access_flags) { @@ -39,6 +41,8 @@
> static int mana_ib_gd_create_mr(struct mana_ib_dev *dev, struct mana_ib_mr
> *mr,
> req.mr_type = mr_params->mr_type;
>
> switch (mr_params->mr_type) {
> + case GDMA_MR_TYPE_GPA:
> + break;
> case GDMA_MR_TYPE_GVA:
> req.gva.dma_region_handle = mr_params-
> >gva.dma_region_handle;
> req.gva.virtual_address = mr_params->gva.virtual_address; @@
> -169,6 +173,38 @@ err_free:
> return ERR_PTR(err);
> }
>
> +struct ib_mr *mana_ib_get_dma_mr(struct ib_pd *ibpd, int access_flags)
> +{
> + struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
> + struct gdma_create_mr_params mr_params = {};
> + struct ib_device *ibdev = ibpd->device;
> + struct mana_ib_dev *dev;
> + struct mana_ib_mr *mr;
> + int err;
> +
> + dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
> +
> + if (access_flags & ~VALID_DMA_MR_FLAGS)
> + return ERR_PTR(-EINVAL);
> +
> + mr = kzalloc(sizeof(*mr), GFP_KERNEL);
> + if (!mr)
> + return ERR_PTR(-ENOMEM);
> +
> + mr_params.pd_handle = pd->pd_handle;
> + mr_params.mr_type = GDMA_MR_TYPE_GPA;
> +
> + err = mana_ib_gd_create_mr(dev, mr, &mr_params);
> + if (err)
> + goto err_free;
> +
> + return &mr->ibmr;
> +
> +err_free:
> + kfree(mr);
> + return ERR_PTR(err);
> +}
> +
> int mana_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) {
> struct mana_ib_mr *mr = container_of(ibmr, struct mana_ib_mr, ibmr);
> diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h index
> 03e1b25..a94b04e 100644
> --- a/include/net/mana/gdma.h
> +++ b/include/net/mana/gdma.h
> @@ -801,6 +801,11 @@ struct gdma_destory_pd_resp {
> };/* HW DATA */
>
> enum gdma_mr_type {
> + /*
> + * Guest Physical Address - MRs of this type allow access
> + * to any DMA-mapped memory using bus-logical address
> + */
> + GDMA_MR_TYPE_GPA = 1,
> /* Guest Virtual Address - MRs of this type allow access
> * to memory mapped by PTEs associated with this MR using a virtual
> * address that is set up in the MST
> --
> 2.43.0
