IB/opa-vnic: Virtual Network Interface Controller (VNIC) interface

Define OPA VNIC interface between hardware independent VNIC
functionality and the hardware dependent VNIC functionality.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/rdma/ib_verbs.h

@@ -225,6 +225,7 @@ enum ib_device_cap_flags {
 	IB_DEVICE_VIRTUAL_FUNCTION		= (1ULL << 33),
 	/* Deprecated. Please use IB_RAW_PACKET_CAP_SCATTER_FCS. */
 	IB_DEVICE_RAW_SCATTER_FCS		= (1ULL << 34),
+	IB_DEVICE_RDMA_NETDEV_OPA_VNIC		= (1ULL << 35),
 };
 
 enum ib_signature_prot_cap {

include/rdma/opa_vnic.h

+#ifndef _OPA_VNIC_H
+#define _OPA_VNIC_H
+/*
+ * Copyright(c) 2017 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  - Neither the name of Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ * This file contains Intel Omni-Path (OPA) Virtual Network Interface
+ * Controller (VNIC) specific declarations.
+ */
+
+#include <rdma/ib_verbs.h>
+
+/* VNIC uses 16B header format */
+#define OPA_VNIC_L2_TYPE    0x2
+
+/* 16 header bytes + 2 reserved bytes */
+#define OPA_VNIC_L2_HDR_LEN   (16 + 2)
+
+#define OPA_VNIC_L4_HDR_LEN   2
+
+#define OPA_VNIC_HDR_LEN      (OPA_VNIC_L2_HDR_LEN + \
+			       OPA_VNIC_L4_HDR_LEN)
+
+#define OPA_VNIC_L4_ETHR  0x78
+
+#define OPA_VNIC_ICRC_LEN   4
+#define OPA_VNIC_TAIL_LEN   1
+#define OPA_VNIC_ICRC_TAIL_LEN  (OPA_VNIC_ICRC_LEN + OPA_VNIC_TAIL_LEN)
+
+#define OPA_VNIC_SKB_MDATA_LEN         4
+#define OPA_VNIC_SKB_MDATA_ENCAP_ERR   0x1
+
+/* opa vnic rdma netdev's private data structure */
+struct opa_vnic_rdma_netdev {
+	struct rdma_netdev rn;  /* keep this first */
+	/* followed by device private data */
+	char *dev_priv[0];
+};
+
+static inline void *opa_vnic_priv(const struct net_device *dev)
+{
+	struct rdma_netdev *rn = netdev_priv(dev);
+
+	return rn->clnt_priv;
+}
+
+static inline void *opa_vnic_dev_priv(const struct net_device *dev)
+{
+	struct opa_vnic_rdma_netdev *oparn = netdev_priv(dev);
+
+	return oparn->dev_priv;
+}
+
+/* opa_vnic skb meta data structrue */
+struct opa_vnic_skb_mdata {
+	u8 vl;
+	u8 entropy;
+	u8 flags;
+	u8 rsvd;
+} __packed;
+
+/* OPA VNIC group statistics */
+struct opa_vnic_grp_stats {
+	u64 unicast;
+	u64 mcastbcast;
+	u64 untagged;
+	u64 vlan;
+	u64 s_64;
+	u64 s_65_127;
+	u64 s_128_255;
+	u64 s_256_511;
+	u64 s_512_1023;
+	u64 s_1024_1518;
+	u64 s_1519_max;
+};
+
+struct opa_vnic_stats {
+	/* standard netdev statistics */
+	struct rtnl_link_stats64 netstats;
+
+	/* OPA VNIC statistics */
+	struct opa_vnic_grp_stats tx_grp;
+	struct opa_vnic_grp_stats rx_grp;
+	u64 tx_dlid_zero;
+	u64 tx_drop_state;
+	u64 rx_drop_state;
+	u64 rx_runt;
+	u64 rx_oversize;
+};
+
+static inline bool rdma_cap_opa_vnic(struct ib_device *device)
+{
+	return !!(device->attrs.device_cap_flags &
+		  IB_DEVICE_RDMA_NETDEV_OPA_VNIC);
+}
+
+#endif /* _OPA_VNIC_H */