From: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Add support to register a memory with the firmware via the DEVX
interface.
The driver translates a given user address to ib_umem then it will
register the physical addresses with the firmware and get a unique id
for this registration to be used for this virtual address.
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/devx.c | 199 ++++++++++++++++++++++++++++++-
include/linux/mlx5/mlx5_ifc.h | 1 +
include/uapi/rdma/mlx5_user_ioctl_cmds.h | 18 +++
3 files changed, 217 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
index a893df36a39b..d954170b2183 100644
--- a/drivers/infiniband/hw/mlx5/devx.c
+++ b/drivers/infiniband/hw/mlx5/devx.c
@@ -51,6 +51,22 @@ struct devx_obj {
u32 dinbox[MLX5_MAX_DESTROY_INBOX_SIZE_DW];
};
+struct devx_umem {
+ struct mlx5_core_dev *mdev;
+ struct ib_umem *umem;
+ u32 page_offset;
+ int page_shift;
+ int ncont;
+ u32 dinlen;
+ u32 dinbox[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)];
+};
+
+struct devx_umem_reg_cmd {
+ void *in;
+ u32 inlen;
+ u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
+};
+
static struct mlx5_ib_ucontext *devx_ufile2uctx(struct ib_uverbs_file *file)
{
return to_mucontext(ib_uverbs_get_ucontext(file));
@@ -814,6 +830,181 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_QUERY)(struct ib_device *ib_de
return err;
}
+static int devx_umem_get(struct mlx5_ib_dev *dev, struct ib_ucontext *ucontext,
+ struct uverbs_attr_bundle *attrs,
+ struct devx_umem *obj)
+{
+ u64 addr;
+ size_t size;
+ int access;
+ int npages;
+ int err;
+ u32 page_mask;
+
+ if (uverbs_copy_from(&addr, attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR) ||
+ uverbs_copy_from(&size, attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_LEN) ||
+ uverbs_copy_from(&access, attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS))
+ return -EFAULT;
+
+ err = ib_check_mr_access(access);
+ if (err)
+ return err;
+
+ obj->umem = ib_umem_get(ucontext, addr, size, access, 0);
+ if (IS_ERR(obj->umem))
+ return PTR_ERR(obj->umem);
+
+ mlx5_ib_cont_pages(obj->umem, obj->umem->address,
+ MLX5_MKEY_PAGE_SHIFT_MASK, &npages,
+ &obj->page_shift, &obj->ncont, NULL);
+
+ if (!npages) {
+ ib_umem_release(obj->umem);
+ return -EINVAL;
+ }
+
+ page_mask = (1 << obj->page_shift) - 1;
+ obj->page_offset = obj->umem->address & page_mask;
+
+ return 0;
+}
+
+static int devx_umem_reg_cmd_alloc(struct devx_umem *obj,
+ struct devx_umem_reg_cmd *cmd)
+{
+ cmd->inlen = MLX5_ST_SZ_BYTES(create_umem_in) +
+ (MLX5_ST_SZ_BYTES(mtt) * obj->ncont);
+ cmd->in = kvzalloc(cmd->inlen, GFP_KERNEL);
+ return cmd->in ? 0 : -ENOMEM;
+}
+
+static void devx_umem_reg_cmd_free(struct devx_umem_reg_cmd *cmd)
+{
+ kvfree(cmd->in);
+}
+
+static void devx_umem_reg_cmd_build(struct mlx5_ib_dev *dev,
+ struct devx_umem *obj,
+ struct devx_umem_reg_cmd *cmd)
+{
+ void *umem;
+ __be64 *mtt;
+
+ umem = MLX5_ADDR_OF(create_umem_in, cmd->in, umem);
+ mtt = (__be64 *)MLX5_ADDR_OF(umem, umem, mtt);
+
+ MLX5_SET(general_obj_in_cmd_hdr, cmd->in, opcode, MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
+ MLX5_SET(general_obj_in_cmd_hdr, cmd->in, obj_type, MLX5_OBJ_TYPE_UMEM);
+ MLX5_SET64(umem, umem, num_of_mtt, obj->ncont);
+ MLX5_SET(umem, umem, log_page_size, obj->page_shift -
+ MLX5_ADAPTER_PAGE_SHIFT);
+ MLX5_SET(umem, umem, page_offset, obj->page_offset);
+ mlx5_ib_populate_pas(dev, obj->umem, obj->page_shift, mtt,
+ (obj->umem->writable ? MLX5_IB_MTT_WRITE : 0) |
+ MLX5_IB_MTT_READ);
+}
+
+static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_UMEM_REG)(struct ib_device *ib_dev,
+ struct ib_uverbs_file *file,
+ struct uverbs_attr_bundle *attrs)
+{
+ struct mlx5_ib_ucontext *c = devx_ufile2uctx(file);
+ struct mlx5_ib_dev *dev = to_mdev(ib_dev);
+ struct devx_umem_reg_cmd cmd;
+ struct devx_umem *obj;
+ struct ib_uobject *uobj;
+ u32 obj_id;
+ int err;
+
+ if (!c->devx_uid)
+ return -EPERM;
+
+ uobj = uverbs_attr_get_uobject(attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE);
+ obj = kzalloc(sizeof(struct devx_umem), GFP_KERNEL);
+ if (!obj)
+ return -ENOMEM;
+
+ err = devx_umem_get(dev, &c->ibucontext, attrs, obj);
+ if (err)
+ goto err_obj_free;
+
+ err = devx_umem_reg_cmd_alloc(obj, &cmd);
+ if (err)
+ goto err_umem_release;
+
+ devx_umem_reg_cmd_build(dev, obj, &cmd);
+
+ MLX5_SET(general_obj_in_cmd_hdr, cmd.in, uid, c->devx_uid);
+ err = mlx5_cmd_exec(dev->mdev, cmd.in, cmd.inlen, cmd.out,
+ sizeof(cmd.out));
+ if (err)
+ goto err_umem_reg_cmd_free;
+
+ obj->mdev = dev->mdev;
+ uobj->object = obj;
+ devx_obj_build_destroy_cmd(cmd.in, cmd.out, obj->dinbox, &obj->dinlen, &obj_id);
+ err = uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID, &obj_id, sizeof(obj_id));
+ if (err)
+ goto err_umem_destroy;
+
+ devx_umem_reg_cmd_free(&cmd);
+
+ return 0;
+
+err_umem_destroy:
+ mlx5_cmd_exec(obj->mdev, obj->dinbox, obj->dinlen, cmd.out, sizeof(cmd.out));
+err_umem_reg_cmd_free:
+ devx_umem_reg_cmd_free(&cmd);
+err_umem_release:
+ ib_umem_release(obj->umem);
+err_obj_free:
+ kfree(obj);
+ return err;
+}
+
+static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_UMEM_DEREG)(struct ib_device *ib_dev,
+ struct ib_uverbs_file *file,
+ struct uverbs_attr_bundle *attrs)
+{
+ return 0;
+}
+
+static int devx_umem_cleanup(struct ib_uobject *uobject,
+ enum rdma_remove_reason why)
+{
+ struct devx_umem *obj = uobject->object;
+ u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
+ int err;
+
+ err = mlx5_cmd_exec(obj->mdev, obj->dinbox, obj->dinlen, out, sizeof(out));
+ if (err && why == RDMA_REMOVE_DESTROY)
+ return err;
+
+ ib_umem_release(obj->umem);
+ kfree(obj);
+ return 0;
+}
+
+static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_UMEM_REG,
+ &UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE,
+ MLX5_IB_OBJECT_DEVX_UMEM,
+ UVERBS_ACCESS_NEW,
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
+ &UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR, UVERBS_ATTR_TYPE(u64),
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
+ &UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_LEN, UVERBS_ATTR_TYPE(u64),
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
+ &UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS, UVERBS_ATTR_TYPE(u32),
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
+ &UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID, UVERBS_ATTR_TYPE(u32),
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
+
+static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_UMEM_DEREG,
+ &UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_UMEM_DEREG_HANDLE,
+ MLX5_IB_OBJECT_DEVX_UMEM,
+ UVERBS_ACCESS_DESTROY,
+ UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
+
static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR,
&UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_QUERY_UAR_USER_IDX, UVERBS_ATTR_TYPE(u32),
UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
@@ -894,6 +1085,12 @@ static DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ,
&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_MODIFY),
&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_QUERY));
+static DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM,
+ &UVERBS_TYPE_ALLOC_IDR(devx_umem_cleanup),
+ &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_REG),
+ &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_DEREG));
+
static DECLARE_UVERBS_OBJECT_TREE(devx_objects,
&UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX),
- &UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ));
+ &UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ),
+ &UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM));
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 647f4408ec84..e3ede1cbf8fa 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -81,6 +81,7 @@ enum {
enum {
MLX5_OBJ_TYPE_UCTX = 0x0004,
+ MLX5_OBJ_TYPE_UMEM = 0x0005,
};
enum {
diff --git a/include/uapi/rdma/mlx5_user_ioctl_cmds.h b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
index 1252695cd94b..dbc549a7bf50 100644
--- a/include/uapi/rdma/mlx5_user_ioctl_cmds.h
+++ b/include/uapi/rdma/mlx5_user_ioctl_cmds.h
@@ -89,9 +89,27 @@ enum mlx5_ib_devx_obj_methods {
MLX5_IB_METHOD_DEVX_OBJ_QUERY,
};
+enum mlx5_ib_devx_umem_reg_attrs {
+ MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
+ MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR,
+ MLX5_IB_ATTR_DEVX_UMEM_REG_LEN,
+ MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
+ MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID,
+};
+
+enum mlx5_ib_devx_umem_dereg_attrs {
+ MLX5_IB_ATTR_DEVX_UMEM_DEREG_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
+};
+
+enum mlx5_ib_devx_umem_methods {
+ MLX5_IB_METHOD_DEVX_UMEM_REG = (1U << UVERBS_ID_NS_SHIFT),
+ MLX5_IB_METHOD_DEVX_UMEM_DEREG,
+};
+
enum mlx5_ib_devx_objects {
MLX5_IB_OBJECT_DEVX = (1U << UVERBS_ID_NS_SHIFT),
MLX5_IB_OBJECT_DEVX_OBJ,
+ MLX5_IB_OBJECT_DEVX_UMEM,
};
#endif
--
2.14.3
--
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