RDMA/mana_ib: implement get_dma_mr

Implement allocation of DMA-mapped memory regions.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://patch.msgid.link/1737394039-28772-3-git-send-email-kotaranov@linux.microsoft.com
Reviewed-by: Shiraz Saleem <shirazsaleem@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/mana/device.c b/drivers/infiniband/hw/mana/device.c
index 3416a85f87382563a46e3239a6e464642e0ed42a..681e243b349c95bf6c08695f88549c6771394b30 100644 (file)
--- 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 887b09dd86e7843e08ab7242a8fb862066164b39..3a047f8c9fc52c9b84e27b338d8c6fd64d830f8d 100644 (file)
--- 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 03e1b257953eb09b3bf2f741e327f2312851f22e..a94b04ea926faf9ef3485031b471c56ca11571cb 100644 (file)
--- 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