linux-kernel - [PATCH rdma-next 2/2] RDMA/mana_ib: Implement get_dma

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Date: Wed, 17 Apr 2024 07:20:59 -0700
From: Konstantin Taranov <kotaranov@...ux.microsoft.com>
To: kotaranov@...rosoft.com,
	sharmaajay@...rosoft.com,
	longli@...rosoft.com,
	jgg@...pe.ca,
	leon@...nel.org
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH rdma-next 2/2] RDMA/mana_ib: Implement get_dma_mr

From: Konstantin Taranov <kotaranov@...rosoft.com>

Implement allocation of DMA-mapped memory regions.

Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.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 6fa902ee80a6..043cef09f1c2 100644
--- a/drivers/infiniband/hw/mana/device.c
+++ b/drivers/infiniband/hw/mana/device.c
@@ -29,6 +29,7 @@ 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_port_immutable = mana_ib_get_port_immutable,
 	.mmap = mana_ib_mmap,
 	.modify_qp = mana_ib_modify_qp,
diff --git a/drivers/infiniband/hw/mana/mr.c b/drivers/infiniband/hw/mana/mr.c
index 4f13423ecdbd..7c9394926a18 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;
@@ -168,6 +172,38 @@ struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length,
 	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 8d796a30ddde..dc19b5cb33a6 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -788,6 +788,11 @@ 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