[PATCH v4 02/16] IB/pvrdma: Add user-level shared functions

[Adit Ranadive <aditr-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>]

We share some common structures with the user-level driver. This patch
adds those structures and shared functions to traverse the QP/CQ rings.

Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Jorgen Hansen <jhansen-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
Reviewed-by: George Zhang <georgezhang-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
Reviewed-by: Aditya Sarwade <asarwade-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
Reviewed-by: Bryan Tan <bryantan-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Adit Ranadive <aditr-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
---
Changes v3->v4:
 - Moved pvrdma_sge into pvrdma_uapi.h
---
 drivers/infiniband/hw/pvrdma/pvrdma_uapi.h | 255 +++++++++++++++++++++++++++++
 drivers/infiniband/hw/pvrdma/pvrdma_user.h |  99 +++++++++++
 2 files changed, 354 insertions(+)
 create mode 100644 drivers/infiniband/hw/pvrdma/pvrdma_uapi.h
 create mode 100644 drivers/infiniband/hw/pvrdma/pvrdma_user.h

diff --git a/drivers/infiniband/hw/pvrdma/pvrdma_uapi.h b/drivers/infiniband/hw/pvrdma/pvrdma_uapi.h
new file mode 100644
index 0000000..430d8a5
--- /dev/null
+++ b/drivers/infiniband/hw/pvrdma/pvrdma_uapi.h
@@ -0,0 +1,255 @@
+/*
+ * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of EITHER the GNU General Public License
+ * version 2 as published by the Free Software Foundation or the BSD
+ * 2-Clause License. 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 version 2 for more details at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program available in the file COPYING in the main
+ * directory of this source tree.
+ *
+ * The BSD 2-Clause 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.
+ *
+ * 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 HOLDER 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.
+ */
+
+#ifndef __PVRDMA_UAPI_H__
+#define __PVRDMA_UAPI_H__
+
+#include <linux/types.h>
+
+#define PVRDMA_VERSION 17
+
+#define PVRDMA_UAR_HANDLE_MASK	0x00FFFFFF	/* Bottom 24 bits. */
+#define PVRDMA_UAR_QP_OFFSET	0		/* Offset of QP doorbell. */
+#define PVRDMA_UAR_QP_SEND	BIT(30)		/* Send bit. */
+#define PVRDMA_UAR_QP_RECV	BIT(31)		/* Recv bit. */
+#define PVRDMA_UAR_CQ_OFFSET	4		/* Offset of CQ doorbell. */
+#define PVRDMA_UAR_CQ_ARM_SOL	BIT(29)		/* Arm solicited bit. */
+#define PVRDMA_UAR_CQ_ARM	BIT(30)		/* Arm bit. */
+#define PVRDMA_UAR_CQ_POLL	BIT(31)		/* Poll bit. */
+#define PVRDMA_INVALID_IDX	-1		/* Invalid index. */
+
+/* PVRDMA atomic compare and swap */
+struct pvrdma_exp_cmp_swap {
+	__u64 swap_val;
+	__u64 compare_val;
+	__u64 swap_mask;
+	__u64 compare_mask;
+};
+
+/* PVRDMA atomic fetch and add */
+struct pvrdma_exp_fetch_add {
+	__u64 add_val;
+	__u64 field_boundary;
+};
+
+/* PVRDMA address vector. */
+struct pvrdma_av {
+	__u32 port_pd;
+	__u32 sl_tclass_flowlabel;
+	__u8 dgid[16];
+	__u8 src_path_bits;
+	__u8 gid_index;
+	__u8 stat_rate;
+	__u8 hop_limit;
+	__u8 dmac[6];
+	__u8 reserved[6];
+};
+
+/* PVRDMA scatter/gather entry */
+struct pvrdma_sge {
+	__u64   addr;
+	__u32   length;
+	__u32   lkey;
+};
+
+/* PVRDMA receive queue work request */
+struct pvrdma_rq_wqe_hdr {
+	__u64 wr_id;		/* wr id */
+	__u32 num_sge;		/* size of s/g array */
+	__u32 total_len;	/* reserved */
+};
+/* Use pvrdma_sge (ib_sge) for receive queue s/g array elements. */
+
+/* PVRDMA send queue work request */
+struct pvrdma_sq_wqe_hdr {
+	__u64 wr_id;		/* wr id */
+	__u32 num_sge;		/* size of s/g array */
+	__u32 total_len;	/* reserved */
+	__u32 opcode;		/* operation type */
+	__u32 send_flags;	/* wr flags */
+	union {
+		__u32 imm_data;
+		__u32 invalidate_rkey;
+	} ex;
+	__u32 reserved;
+	union {
+		struct {
+			__u64 remote_addr;
+			__u32 rkey;
+			__u8 reserved[4];
+		} rdma;
+		struct {
+			__u64 remote_addr;
+			__u64 compare_add;
+			__u64 swap;
+			__u32 rkey;
+			__u32 reserved;
+		} atomic;
+		struct {
+			__u64 remote_addr;
+			__u32 log_arg_sz;
+			__u32 rkey;
+			union {
+				struct pvrdma_exp_cmp_swap  cmp_swap;
+				struct pvrdma_exp_fetch_add fetch_add;
+			} wr_data;
+		} masked_atomics;
+		struct {
+			__u64 iova_start;
+			__u64 pl_pdir_dma;
+			__u32 page_shift;
+			__u32 page_list_len;
+			__u32 length;
+			__u32 access_flags;
+			__u32 rkey;
+		} fast_reg;
+		struct {
+			__u32 remote_qpn;
+			__u32 remote_qkey;
+			struct pvrdma_av av;
+		} ud;
+	} wr;
+};
+/* Use pvrdma_sge (ib_sge) for send queue s/g array elements. */
+
+/* Completion queue element. */
+struct pvrdma_cqe {
+	__u64 wr_id;
+	__u64 qp;
+	__u32 opcode;
+	__u32 status;
+	__u32 byte_len;
+	__u32 imm_data;
+	__u32 src_qp;
+	__u32 wc_flags;
+	__u32 vendor_err;
+	__u16 pkey_index;
+	__u16 slid;
+	__u8 sl;
+	__u8 dlid_path_bits;
+	__u8 port_num;
+	__u8 smac[6];
+	__u8 reserved2[7]; /* Pad to next power of 2 (64). */
+};
+
+struct pvrdma_ring {
+	atomic_t prod_tail;	/* Producer tail. */
+	atomic_t cons_head;	/* Consumer head. */
+};
+
+struct pvrdma_ring_state {
+	struct pvrdma_ring tx;	/* Tx ring. */
+	struct pvrdma_ring rx;	/* Rx ring. */
+};
+
+static inline int pvrdma_idx_valid(__u32 idx, __u32 max_elems)
+{
+	/* Generates fewer instructions than a less-than. */
+	return (idx & ~((max_elems << 1) - 1)) == 0;
+}
+
+static inline __s32 pvrdma_idx(atomic_t *var, __u32 max_elems)
+{
+	const unsigned int idx = atomic_read(var);
+
+	if (pvrdma_idx_valid(idx, max_elems))
+		return idx & (max_elems - 1);
+	return PVRDMA_INVALID_IDX;
+}
+
+static inline void pvrdma_idx_ring_inc(atomic_t *var, __u32 max_elems)
+{
+	__u32 idx = atomic_read(var) + 1;	/* Increment. */
+
+	idx &= (max_elems << 1) - 1;		/* Modulo size, flip gen. */
+	atomic_set(var, idx);
+}
+
+static inline __s32 pvrdma_idx_ring_has_space(const struct pvrdma_ring *r,
+					      __u32 max_elems, __u32 *out_tail)
+{
+	const __u32 tail = atomic_read(&r->prod_tail);
+	const __u32 head = atomic_read(&r->cons_head);
+
+	if (pvrdma_idx_valid(tail, max_elems) &&
+	    pvrdma_idx_valid(head, max_elems)) {
+		*out_tail = tail & (max_elems - 1);
+		return tail != (head ^ max_elems);
+	}
+	return PVRDMA_INVALID_IDX;
+}
+
+static inline __s32 pvrdma_idx_ring_has_data(const struct pvrdma_ring *r,
+					     __u32 max_elems, __u32 *out_head)
+{
+	const __u32 tail = atomic_read(&r->prod_tail);
+	const __u32 head = atomic_read(&r->cons_head);
+
+	if (pvrdma_idx_valid(tail, max_elems) &&
+	    pvrdma_idx_valid(head, max_elems)) {
+		*out_head = head & (max_elems - 1);
+		return tail != head;
+	}
+	return PVRDMA_INVALID_IDX;
+}
+
+static inline bool pvrdma_idx_ring_is_valid_idx(const struct pvrdma_ring *r,
+						__u32 max_elems, __u32 *idx)
+{
+	const __u32 tail = atomic_read(&r->prod_tail);
+	const __u32 head = atomic_read(&r->cons_head);
+
+	if (pvrdma_idx_valid(tail, max_elems) &&
+	    pvrdma_idx_valid(head, max_elems) &&
+	    pvrdma_idx_valid(*idx, max_elems)) {
+		if (tail > head && (*idx < tail && *idx >= head))
+			return true;
+		else if (head > tail && (*idx >= head || *idx < tail))
+			return true;
+	}
+	return false;
+}
+
+#endif /* __PVRDMA_UAPI_H__ */
diff --git a/drivers/infiniband/hw/pvrdma/pvrdma_user.h b/drivers/infiniband/hw/pvrdma/pvrdma_user.h
new file mode 100644
index 0000000..35f8c1e
--- /dev/null
+++ b/drivers/infiniband/hw/pvrdma/pvrdma_user.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of EITHER the GNU General Public License
+ * version 2 as published by the Free Software Foundation or the BSD
+ * 2-Clause License. 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 version 2 for more details at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program available in the file COPYING in the main
+ * directory of this source tree.
+ *
+ * The BSD 2-Clause 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.
+ *
+ * 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 HOLDER 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.
+ */
+
+#ifndef __PVRDMA_USER_H__
+#define __PVRDMA_USER_H__
+
+#include <linux/types.h>
+
+#define PVRDMA_UVERBS_ABI_VERSION	3
+#define PVRDMA_BOARD_ID			1
+#define PVRDMA_REV_ID			1
+
+struct pvrdma_alloc_ucontext_resp {
+	u32 qp_tab_size;
+	u32 reserved;
+};
+
+struct pvrdma_alloc_pd_resp {
+	u32 pdn;
+	u32 reserved;
+};
+
+struct pvrdma_create_cq {
+	u64 buf_addr;
+	u32 buf_size;
+	u32 reserved;
+};
+
+struct pvrdma_create_cq_resp {
+	u32 cqn;
+	u32 reserved;
+};
+
+struct pvrdma_resize_cq {
+	u64 buf_addr;
+	u32 buf_size;
+	u32 reserved;
+};
+
+struct pvrdma_create_srq {
+	u64 buf_addr;
+};
+
+struct pvrdma_create_srq_resp {
+	u32 srqn;
+	u32 reserved;
+};
+
+struct pvrdma_create_qp {
+	u64 rbuf_addr;
+	u64 sbuf_addr;
+	u32 rbuf_size;
+	u32 sbuf_size;
+	u64 qp_addr;
+};
+
+#endif /* __PVRDMA_USER_H__ */
-- 
2.7.4

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