IB/uverbs: Extend uverbs_ioctl header with driver_id

Extending uverbs_ioctl header with driver_id and another reserved
field. driver_id should be used in order to identify the driver.
Since every driver could have its own parsing tree, this is necessary
for strace support.
Downstream patches take off the EXPERIMENTAL flag from the ioctl() IB
support and thus we add some reserved fields for future usage.

Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/uverbs_ioctl.c

@@ -246,6 +246,9 @@ static long ib_uverbs_cmd_verbs(struct ib_device *ib_dev,
 	size_t ctx_size;
 	uintptr_t data[UVERBS_OPTIMIZE_USING_STACK_SZ / sizeof(uintptr_t)];
 
+	if (hdr->driver_id != ib_dev->driver_id)
+		return -EINVAL;
+
 	object_spec = uverbs_get_object(ib_dev, hdr->object_id);
 	if (!object_spec)
 		return -EPROTONOSUPPORT;
@@ -350,7 +353,7 @@ long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			goto out;
 		}
 
-		if (hdr.reserved) {
+		if (hdr.reserved1 || hdr.reserved2) {
 			err = -EPROTONOSUPPORT;
 			goto out;
 		}

drivers/infiniband/hw/bnxt_re/main.c

@@ -619,6 +619,7 @@ static int bnxt_re_register_ib(struct bnxt_re_dev *rdev)
 	ibdev->get_hw_stats             = bnxt_re_ib_get_hw_stats;
 	ibdev->alloc_hw_stats           = bnxt_re_ib_alloc_hw_stats;
 
+	ibdev->driver_id = RDMA_DRIVER_BNXT_RE;
 	return ib_register_device(ibdev, NULL);
 }
 

drivers/infiniband/hw/cxgb3/iwch_provider.c

@@ -1439,6 +1439,7 @@ int iwch_register_device(struct iwch_dev *dev)
 	memcpy(dev->ibdev.iwcm->ifname, dev->rdev.t3cdev_p->lldev->name,
 	       sizeof(dev->ibdev.iwcm->ifname));
 
+	dev->ibdev.driver_id = RDMA_DRIVER_CXGB3;
 	ret = ib_register_device(&dev->ibdev, NULL);
 	if (ret)
 		goto bail1;

drivers/infiniband/hw/cxgb4/provider.c

@@ -629,6 +629,7 @@ void c4iw_register_device(struct work_struct *work)
 	memcpy(dev->ibdev.iwcm->ifname, dev->rdev.lldi.ports[0]->name,
 	       sizeof(dev->ibdev.iwcm->ifname));
 
+	dev->ibdev.driver_id = RDMA_DRIVER_CXGB4;
 	ret = ib_register_device(&dev->ibdev, NULL);
 	if (ret)
 		goto err_kfree_iwcm;

drivers/infiniband/hw/hfi1/verbs.c

@@ -1960,7 +1960,7 @@ int hfi1_register_ib_device(struct hfi1_devdata *dd)
 			      i,
 			      ppd->pkeys);
 
-	ret = rvt_register_device(&dd->verbs_dev.rdi);
+	ret = rvt_register_device(&dd->verbs_dev.rdi, RDMA_DRIVER_HFI1);
 	if (ret)
 		goto err_verbs_txreq;
 

drivers/infiniband/hw/hns/hns_roce_main.c

@@ -526,6 +526,7 @@ static int hns_roce_register_device(struct hns_roce_dev *hr_dev)
 	/* OTHERS */
 	ib_dev->get_port_immutable	= hns_roce_port_immutable;
 
+	ib_dev->driver_id = RDMA_DRIVER_HNS;
 	ret = ib_register_device(ib_dev, NULL);
 	if (ret) {
 		dev_err(dev, "ib_register_device failed!\n");

drivers/infiniband/hw/i40iw/i40iw_verbs.c

@@ -2927,6 +2927,7 @@ int i40iw_register_rdma_device(struct i40iw_device *iwdev)
 		return -ENOMEM;
 	iwibdev = iwdev->iwibdev;
 
+	iwibdev->ibdev.driver_id = RDMA_DRIVER_I40IW;
 	ret = ib_register_device(&iwibdev->ibdev, NULL);
 	if (ret)
 		goto error;

drivers/infiniband/hw/mlx4/main.c

@@ -2955,6 +2955,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 	if (mlx4_ib_alloc_diag_counters(ibdev))
 		goto err_steer_free_bitmap;
 
+	ibdev->ib_dev.driver_id = RDMA_DRIVER_MLX4;
 	if (ib_register_device(&ibdev->ib_dev, NULL))
 		goto err_diag_counters;
 

drivers/infiniband/hw/mlx5/main.c

@@ -4779,6 +4779,7 @@ int mlx5_ib_stage_caps_init(struct mlx5_ib_dev *dev)
 	dev->ib_dev.uverbs_ex_cmd_mask |=
 			(1ull << IB_USER_VERBS_EX_CMD_CREATE_FLOW) |
 			(1ull << IB_USER_VERBS_EX_CMD_DESTROY_FLOW);
+	dev->ib_dev.driver_id = RDMA_DRIVER_MLX5;
 
 	err = init_node_data(dev);
 	if (err)

drivers/infiniband/hw/mthca/mthca_provider.c

@@ -1295,6 +1295,7 @@ int mthca_register_device(struct mthca_dev *dev)
 
 	mutex_init(&dev->cap_mask_mutex);
 
+	dev->ib_dev.driver_id = RDMA_DRIVER_MTHCA;
 	ret = ib_register_device(&dev->ib_dev, NULL);
 	if (ret)
 		return ret;

drivers/infiniband/hw/nes/nes_verbs.c

@@ -3854,6 +3854,7 @@ int nes_register_ofa_device(struct nes_ib_device *nesibdev)
 	struct nes_adapter *nesadapter = nesdev->nesadapter;
 	int i, ret;
 
+	nesvnic->nesibdev->ibdev.driver_id = RDMA_DRIVER_NES;
 	ret = ib_register_device(&nesvnic->nesibdev->ibdev, NULL);
 	if (ret) {
 		return ret;

drivers/infiniband/hw/ocrdma/ocrdma_main.c

@@ -215,6 +215,7 @@ static int ocrdma_register_device(struct ocrdma_dev *dev)
 		dev->ibdev.destroy_srq = ocrdma_destroy_srq;
 		dev->ibdev.post_srq_recv = ocrdma_post_srq_recv;
 	}
+	dev->ibdev.driver_id = RDMA_DRIVER_OCRDMA;
 	return ib_register_device(&dev->ibdev, NULL);
 }
 

drivers/infiniband/hw/qedr/main.c

@@ -257,6 +257,7 @@ static int qedr_register_device(struct qedr_dev *dev)
 	dev->ibdev.get_link_layer = qedr_link_layer;
 	dev->ibdev.get_dev_fw_str = qedr_get_dev_fw_str;
 
+	dev->ibdev.driver_id = RDMA_DRIVER_QEDR;
 	return ib_register_device(&dev->ibdev, NULL);
 }
 

drivers/infiniband/hw/qib/qib_verbs.c

@@ -1646,7 +1646,7 @@ int qib_register_ib_device(struct qib_devdata *dd)
 			      dd->rcd[ctxt]->pkeys);
 	}
 
-	ret = rvt_register_device(&dd->verbs_dev.rdi);
+	ret = rvt_register_device(&dd->verbs_dev.rdi, RDMA_DRIVER_QIB);
 	if (ret)
 		goto err_tx;
 

drivers/infiniband/hw/usnic/usnic_ib_main.c

@@ -433,6 +433,7 @@ static void *usnic_ib_device_add(struct pci_dev *dev)
 	us_ibdev->ib_dev.get_dev_fw_str     = usnic_get_dev_fw_str;
 
 
+	us_ibdev->ib_dev.driver_id = RDMA_DRIVER_USNIC;
 	if (ib_register_device(&us_ibdev->ib_dev, NULL))
 		goto err_fwd_dealloc;
 

drivers/infiniband/hw/vmw_pvrdma/pvrdma_main.c

@@ -276,6 +276,7 @@ static int pvrdma_register_device(struct pvrdma_dev *dev)
 		if (!dev->srq_tbl)
 			goto err_qp_free;
 	}
+	dev->ib_dev.driver_id = RDMA_DRIVER_VMW_PVRDMA;
 	spin_lock_init(&dev->srq_tbl_lock);
 
 	ret = ib_register_device(&dev->ib_dev, NULL);

drivers/infiniband/sw/rdmavt/vt.c

@@ -730,7 +730,7 @@ static noinline int check_support(struct rvt_dev_info *rdi, int verb)
  *
  * Return: 0 on success otherwise an errno.
  */
-int rvt_register_device(struct rvt_dev_info *rdi)
+int rvt_register_device(struct rvt_dev_info *rdi, u32 driver_id)
 {
 	int ret = 0, i;
 
@@ -831,6 +831,7 @@ int rvt_register_device(struct rvt_dev_info *rdi)
 	rdi->ibdev.node_type = RDMA_NODE_IB_CA;
 	rdi->ibdev.num_comp_vectors = 1;
 
+	rdi->ibdev.driver_id = driver_id;
 	/* We are now good to announce we exist */
 	ret =  ib_register_device(&rdi->ibdev, rdi->driver_f.port_callback);
 	if (ret) {

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -1335,6 +1335,7 @@ int rxe_register_device(struct rxe_dev *rxe)
 	}
 	rxe->tfm = tfm;
 
+	dev->driver_id = RDMA_DRIVER_RXE;
 	err = ib_register_device(dev, NULL);
 	if (err) {
 		pr_warn("%s failed with error %d\n", __func__, err);

include/rdma/ib_verbs.h

@@ -64,6 +64,7 @@
 #include <linux/cgroup_rdma.h>
 #include <uapi/rdma/ib_user_verbs.h>
 #include <rdma/restrack.h>
+#include <uapi/rdma/rdma_user_ioctl.h>
 
 #define IB_FW_VERSION_NAME_MAX	ETHTOOL_FWVERS_LEN
 
@@ -2385,6 +2386,7 @@ struct ib_device {
 						     int comp_vector);
 
 	struct uverbs_root_spec		*specs_root;
+	enum rdma_driver_id		driver_id;
 };
 
 struct ib_client {

include/rdma/rdma_vt.h

@@ -538,7 +538,7 @@ static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
 
 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
 void rvt_dealloc_device(struct rvt_dev_info *rdi);
-int rvt_register_device(struct rvt_dev_info *rvd);
+int rvt_register_device(struct rvt_dev_info *rvd, u32 driver_id);
 void rvt_unregister_device(struct rvt_dev_info *rvd);
 int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,

include/uapi/rdma/rdma_user_ioctl_cmds.h

@@ -64,8 +64,30 @@ struct ib_uverbs_ioctl_hdr {
 	__u16 object_id;
 	__u16 method_id;
 	__u16 num_attrs;
-	__aligned_u64 reserved;
+	__aligned_u64 reserved1;
+	__u32 driver_id;
+	__u32 reserved2;
 	struct ib_uverbs_attr  attrs[0];
 };
 
+enum rdma_driver_id {
+	RDMA_DRIVER_UNKNOWN,
+	RDMA_DRIVER_MLX5,
+	RDMA_DRIVER_MLX4,
+	RDMA_DRIVER_CXGB3,
+	RDMA_DRIVER_CXGB4,
+	RDMA_DRIVER_MTHCA,
+	RDMA_DRIVER_BNXT_RE,
+	RDMA_DRIVER_OCRDMA,
+	RDMA_DRIVER_NES,
+	RDMA_DRIVER_I40IW,
+	RDMA_DRIVER_VMW_PVRDMA,
+	RDMA_DRIVER_QEDR,
+	RDMA_DRIVER_HNS,
+	RDMA_DRIVER_USNIC,
+	RDMA_DRIVER_RXE,
+	RDMA_DRIVER_HFI1,
+	RDMA_DRIVER_QIB,
+};
+
 #endif