RDMA: Split kernel-only global device caps from uverbs device caps

Split out flags from ib_device::device_cap_flags that are only used
internally to the kernel into kernel_cap_flags that is not part of the
uapi. This limits the device_cap_flags to being the same bitmap that will
be copied to userspace.

This cleanly splits out the uverbs flags from the kernel flags to avoid
confusion in the flags bitmap.

Add some short comments describing which each of the kernel flags is
connected to. Remove unused kernel flags.

Link: https://lore.kernel.org/r/0-v2-22c19e565eef+139a-kern_caps_jgg@nvidia.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 37 insertions, 51 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ada4a5226dbd..b3bb4dd068b6 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -236,14 +236,6 @@ enum ib_device_cap_flags {
 	IB_DEVICE_SRQ_RESIZE = IB_UVERBS_DEVICE_SRQ_RESIZE,
 	IB_DEVICE_N_NOTIFY_CQ = IB_UVERBS_DEVICE_N_NOTIFY_CQ,
 
-	/*
-	 * This device supports a per-device lkey or stag that can be
-	 * used without performing a memory registration for the local
-	 * memory.  Note that ULPs should never check this flag, but
-	 * instead of use the local_dma_lkey flag in the ib_pd structure,
-	 * which will always contain a usable lkey.
-	 */
-	IB_DEVICE_LOCAL_DMA_LKEY = 1 << 15,
 	/* Reserved, old SEND_W_INV = 1 << 16,*/
 	IB_DEVICE_MEM_WINDOW = IB_UVERBS_DEVICE_MEM_WINDOW,
 	/*
@@ -254,7 +246,6 @@ enum ib_device_cap_flags {
 	 * IPoIB driver may set NETIF_F_IP_CSUM for datagram mode.
 	 */
 	IB_DEVICE_UD_IP_CSUM = IB_UVERBS_DEVICE_UD_IP_CSUM,
-	IB_DEVICE_UD_TSO = 1 << 19,
 	IB_DEVICE_XRC = IB_UVERBS_DEVICE_XRC,
 
 	/*
@@ -267,59 +258,53 @@ enum ib_device_cap_flags {
 	 * stag.
 	 */
 	IB_DEVICE_MEM_MGT_EXTENSIONS = IB_UVERBS_DEVICE_MEM_MGT_EXTENSIONS,
-	IB_DEVICE_BLOCK_MULTICAST_LOOPBACK = 1 << 22,
 	IB_DEVICE_MEM_WINDOW_TYPE_2A = IB_UVERBS_DEVICE_MEM_WINDOW_TYPE_2A,
 	IB_DEVICE_MEM_WINDOW_TYPE_2B = IB_UVERBS_DEVICE_MEM_WINDOW_TYPE_2B,
 	IB_DEVICE_RC_IP_CSUM = IB_UVERBS_DEVICE_RC_IP_CSUM,
 	/* Deprecated. Please use IB_RAW_PACKET_CAP_IP_CSUM. */
 	IB_DEVICE_RAW_IP_CSUM = IB_UVERBS_DEVICE_RAW_IP_CSUM,
-	/*
-	 * Devices should set IB_DEVICE_CROSS_CHANNEL if they
-	 * support execution of WQEs that involve synchronization
-	 * of I/O operations with single completion queue managed
-	 * by hardware.
-	 */
-	IB_DEVICE_CROSS_CHANNEL = 1 << 27,
 	IB_DEVICE_MANAGED_FLOW_STEERING =
 		IB_UVERBS_DEVICE_MANAGED_FLOW_STEERING,
-	IB_DEVICE_INTEGRITY_HANDOVER = 1 << 30,
-	IB_DEVICE_ON_DEMAND_PAGING = 1ULL << 31,
-	IB_DEVICE_SG_GAPS_REG = 1ULL << 32,
-	IB_DEVICE_VIRTUAL_FUNCTION = 1ULL << 33,
 	/* Deprecated. Please use IB_RAW_PACKET_CAP_SCATTER_FCS. */
 	IB_DEVICE_RAW_SCATTER_FCS = IB_UVERBS_DEVICE_RAW_SCATTER_FCS,
-	IB_DEVICE_RDMA_NETDEV_OPA = 1ULL << 35,
 	/* The device supports padding incoming writes to cacheline. */
 	IB_DEVICE_PCI_WRITE_END_PADDING =
 		IB_UVERBS_DEVICE_PCI_WRITE_END_PADDING,
-	IB_DEVICE_ALLOW_USER_UNREG = 1ULL << 37,
-};
-
-#define IB_UVERBS_DEVICE_CAP_FLAGS_MASK	(IB_UVERBS_DEVICE_RESIZE_MAX_WR | \
-		IB_UVERBS_DEVICE_BAD_PKEY_CNTR | \
-		IB_UVERBS_DEVICE_BAD_QKEY_CNTR | \
-		IB_UVERBS_DEVICE_RAW_MULTI | \
-		IB_UVERBS_DEVICE_AUTO_PATH_MIG | \
-		IB_UVERBS_DEVICE_CHANGE_PHY_PORT | \
-		IB_UVERBS_DEVICE_UD_AV_PORT_ENFORCE | \
-		IB_UVERBS_DEVICE_CURR_QP_STATE_MOD | \
-		IB_UVERBS_DEVICE_SHUTDOWN_PORT | \
-		IB_UVERBS_DEVICE_PORT_ACTIVE_EVENT | \
-		IB_UVERBS_DEVICE_SYS_IMAGE_GUID | \
-		IB_UVERBS_DEVICE_RC_RNR_NAK_GEN | \
-		IB_UVERBS_DEVICE_SRQ_RESIZE | \
-		IB_UVERBS_DEVICE_N_NOTIFY_CQ | \
-		IB_UVERBS_DEVICE_MEM_WINDOW | \
-		IB_UVERBS_DEVICE_UD_IP_CSUM | \
-		IB_UVERBS_DEVICE_XRC | \
-		IB_UVERBS_DEVICE_MEM_MGT_EXTENSIONS | \
-		IB_UVERBS_DEVICE_MEM_WINDOW_TYPE_2A | \
-		IB_UVERBS_DEVICE_MEM_WINDOW_TYPE_2B | \
-		IB_UVERBS_DEVICE_RC_IP_CSUM | \
-		IB_UVERBS_DEVICE_RAW_IP_CSUM | \
-		IB_UVERBS_DEVICE_MANAGED_FLOW_STEERING | \
-		IB_UVERBS_DEVICE_RAW_SCATTER_FCS | \
-		IB_UVERBS_DEVICE_PCI_WRITE_END_PADDING)
+};
+
+enum ib_kernel_cap_flags {
+	/*
+	 * This device supports a per-device lkey or stag that can be
+	 * used without performing a memory registration for the local
+	 * memory.  Note that ULPs should never check this flag, but
+	 * instead of use the local_dma_lkey flag in the ib_pd structure,
+	 * which will always contain a usable lkey.
+	 */
+	IBK_LOCAL_DMA_LKEY = 1 << 0,
+	/* IB_QP_CREATE_INTEGRITY_EN is supported to implement T10-PI */
+	IBK_INTEGRITY_HANDOVER = 1 << 1,
+	/* IB_ACCESS_ON_DEMAND is supported during reg_user_mr() */
+	IBK_ON_DEMAND_PAGING = 1 << 2,
+	/* IB_MR_TYPE_SG_GAPS is supported */
+	IBK_SG_GAPS_REG = 1 << 3,
+	/* Driver supports RDMA_NLDEV_CMD_DELLINK */
+	IBK_ALLOW_USER_UNREG = 1 << 4,
+
+	/* ipoib will use IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK */
+	IBK_BLOCK_MULTICAST_LOOPBACK = 1 << 5,
+	/* iopib will use IB_QP_CREATE_IPOIB_UD_LSO for its QPs */
+	IBK_UD_TSO = 1 << 6,
+	/* iopib will use the device ops:
+	 *   get_vf_config
+	 *   get_vf_guid
+	 *   get_vf_stats
+	 *   set_vf_guid
+	 *   set_vf_link_state
+	 */
+	IBK_VIRTUAL_FUNCTION = 1 << 7,
+	/* ipoib will use IB_QP_CREATE_NETDEV_USE for its QPs */
+	IBK_RDMA_NETDEV_OPA = 1 << 8,
+};
 
 enum ib_atomic_cap {
 	IB_ATOMIC_NONE,
@@ -417,6 +402,7 @@ struct ib_device_attr {
 	int			max_qp;
 	int			max_qp_wr;
 	u64			device_cap_flags;
+	u64			kernel_cap_flags;
 	int			max_send_sge;
 	int			max_recv_sge;
 	int			max_sge_rd;
@@ -4344,7 +4330,7 @@ static inline int ib_check_mr_access(struct ib_device *ib_dev,
 		return -EINVAL;
 
 	if (flags & IB_ACCESS_ON_DEMAND &&
-	    !(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
+	    !(ib_dev->attrs.kernel_cap_flags & IBK_ON_DEMAND_PAGING))
 		return -EINVAL;
 	return 0;
 }