[PATCH v2 02/13] Main SoftiWarp include file

[Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>]

Signed-off-by: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
---
 drivers/infiniband/sw/siw/siw.h | 783 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 783 insertions(+)
 create mode 100644 drivers/infiniband/sw/siw/siw.h

diff --git a/drivers/infiniband/sw/siw/siw.h b/drivers/infiniband/sw/siw/siw.h
new file mode 100644
index 000000000000..04a3ca910915
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw.h
@@ -0,0 +1,783 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
+ *
+ * Copyright (c) 2008-2017, IBM Corporation
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * BSD license below:
+ *
+ *   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 IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _SIW_H
+#define _SIW_H
+
+#include <linux/idr.h>
+#include <rdma/ib_verbs.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/fs.h>
+#include <linux/netdevice.h>
+#include <crypto/hash.h>
+#include <linux/resource.h>	/* MLOCK_LIMIT */
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/llist.h>
+#include <linux/mm.h>
+#include <linux/sched/signal.h>
+
+#include <rdma/siw_user.h>
+#include "iwarp.h"
+
+#define DEVICE_ID_SOFTIWARP	0x0815
+#define SIW_VENDOR_ID		0x626d74	/* ascii 'bmt' for now */
+#define SIW_VENDORT_PART_ID	0
+#define SIW_MAX_QP		(1024 * 100)
+#define SIW_MAX_QP_WR		(1024 * 32)
+#define SIW_MAX_ORD_QP		128
+#define SIW_MAX_IRD_QP		128
+#define SIW_MAX_SGE_PBL		256	/* max num sge's for PBL */
+#define SIW_MAX_SGE_RD		1	/* iwarp limitation. we could relax */
+#define SIW_MAX_CQ		(1024 * 100)
+#define SIW_MAX_CQE		(SIW_MAX_QP_WR * 100)
+#define SIW_MAX_MR		(SIW_MAX_QP * 10)
+#define SIW_MAX_PD		SIW_MAX_QP
+#define SIW_MAX_MW		0	/* to be set if MW's are supported */
+#define SIW_MAX_FMR		SIW_MAX_MR
+#define SIW_MAX_SRQ		SIW_MAX_QP
+#define SIW_MAX_SRQ_WR		(SIW_MAX_QP_WR * 10)
+#define SIW_MAX_CONTEXT		SIW_MAX_PD
+
+#define SENDPAGE_THRESH		PAGE_SIZE /* min bytes for using sendpage() */
+#define SQ_USER_MAXBURST	100
+
+#define MAX_CPU			NR_CPUS
+
+struct siw_devinfo {
+	unsigned int	device;
+	unsigned int	version;
+
+	u32	vendor_id;
+	u32	vendor_part_id;
+	u32	sw_version;
+	int	max_qp;
+	int	max_qp_wr;
+	int	max_ord; /* max. outbound read queue depth */
+	int	max_ird; /* max. inbound read queue depth */
+
+	enum ib_device_cap_flags cap_flags;
+	int	max_sge;
+	int	max_sge_rd;
+	int	max_cq;
+	int	max_cqe;
+	u64	max_mr_size;
+	int	max_mr;
+	int	max_pd;
+	int	max_mw;
+	int	max_fmr;
+	int	max_srq;
+	int	max_srq_wr;
+	int	max_srq_sge;
+};
+
+
+struct siw_dev {
+	struct ib_device	ofa_dev;
+	struct list_head	list;
+	struct net_device	*netdev;
+	struct siw_devinfo	attrs;
+	int			is_registered; /* Registered with OFA core */
+
+	/* physical port state (only one port per device) */
+	enum ib_port_state	state;
+
+	/* object management */
+	struct list_head	cep_list;
+	struct list_head	qp_list;
+	spinlock_t		idr_lock;
+	struct idr		qp_idr;
+	struct idr		cq_idr;
+	struct idr		pd_idr;
+	struct idr		mem_idr;
+
+	/* active objects statistics */
+	atomic_t		num_qp;
+	atomic_t		num_cq;
+	atomic_t		num_pd;
+	atomic_t		num_mem;
+	atomic_t		num_srq;
+	atomic_t		num_cep;
+	atomic_t		num_ctx;
+
+	struct dentry		*debugfs;
+};
+
+struct siw_objhdr {
+	u32			id;	/* for idr based object lookup */
+	struct kref		ref;
+	struct siw_dev		*sdev;
+};
+
+struct siw_uobj {
+	struct list_head	list;
+	void	*addr;
+	u32	size;
+	u32	key;
+};
+
+struct siw_ucontext {
+	struct ib_ucontext	ib_ucontext;
+	struct siw_dev		*sdev;
+
+	/* List of user mappable queue objects */
+	struct list_head	uobj_list;
+	spinlock_t		uobj_lock;
+	u32			uobj_key;
+};
+
+struct siw_pd {
+	struct siw_objhdr	hdr;
+	struct ib_pd		ofa_pd;
+};
+
+enum siw_access_flags {
+	SIW_MEM_LREAD	= (1<<0),
+	SIW_MEM_LWRITE	= (1<<1),
+	SIW_MEM_RREAD	= (1<<2),
+	SIW_MEM_RWRITE	= (1<<3),
+
+	SIW_MEM_FLAGS_LOCAL =
+		(SIW_MEM_LREAD | SIW_MEM_LWRITE),
+	SIW_MEM_FLAGS_REMOTE =
+		(SIW_MEM_RWRITE | SIW_MEM_RREAD)
+};
+
+#define SIW_STAG_MAX	0xffffffff
+
+struct siw_mr;
+
+/*
+ * siw presentation of user memory registered as source
+ * or target of RDMA operations.
+ */
+
+struct siw_page_chunk {
+	struct page **p;
+};
+
+struct siw_umem {
+	struct siw_page_chunk	*page_chunk;
+	int			num_pages;
+	u64			fp_addr;	/* First page base address */
+	struct pid		*pid;
+	struct mm_struct	*mm_s;
+	struct work_struct	work;
+};
+
+struct siw_pble {
+	u64	addr;		/* Address of assigned user buffer */
+	u64	size;		/* Size of this entry */
+	u64	pbl_off;	/* Total offset form start of PBL */
+};
+
+struct siw_pbl {
+	unsigned int	num_buf;
+	unsigned int	max_buf;
+	struct siw_pble	pbe[1];
+};
+
+/*
+ * generic memory representation for registered siw memory.
+ * memory lookup always via higher 24 bit of stag (stag index).
+ * the stag is stored as part of the siw object header (id).
+ * object relates to memory window if embedded mr pointer is valid
+ */
+struct siw_mem {
+	struct siw_objhdr	hdr;
+
+	struct siw_mr	*mr;	/* assoc. MR if MW, NULL if MR */
+	u64	va;		/* VA of memory */
+	u64	len;		/* amount of memory bytes */
+
+	u32	stag_valid:1,		/* VALID or INVALID */
+		is_pbl:1,		/* PBL or user space mem */
+		is_zbva:1,		/* zero based virt. addr. */
+		mw_bind_enabled:1,	/* check only if MR */
+		remote_inval_enabled:1,	/* VALID or INVALID */
+		consumer_owns_key:1,	/* key/index split ? */
+		rsvd:26;
+
+	enum siw_access_flags	perms;	/* local/remote READ & WRITE */
+};
+
+#define SIW_MEM_IS_MW(m)	((m)->mr != NULL)
+
+/*
+ * MR and MW definition.
+ * Used OFA structs ib_mr/ib_mw holding:
+ * lkey, rkey, MW reference count on MR
+ */
+struct siw_mr {
+	struct ib_mr	ofa_mr;
+	struct siw_mem	mem;
+	struct rcu_head rcu;
+	union {
+		struct siw_umem	*umem;
+		struct siw_pbl	*pbl;
+		void *mem_obj;
+	};
+	struct siw_pd	*pd;
+};
+
+struct siw_mw {
+	struct ib_mw	ofa_mw;
+	struct siw_mem	mem;
+	struct rcu_head rcu;
+};
+
+enum siw_wr_state {
+	SIW_WR_IDLE		= 0,
+	SIW_WR_QUEUED		= 1,	/* processing has not started yet */
+	SIW_WR_INPROGRESS	= 2	/* initiated processing of the WR */
+};
+
+union siw_mem_resolved {
+	struct siw_mem	*obj;	/* reference to registered memory */
+	char		*buf;	/* linear kernel buffer */
+};
+
+/* The WQE currently being processed (RT or TX) */
+struct siw_wqe {
+	/* Copy of applications SQE or RQE */
+	union {
+		struct siw_sqe	sqe;
+		struct siw_rqe	rqe;
+	};
+	union siw_mem_resolved	mem[SIW_MAX_SGE]; /* per sge's resolved mem */
+	enum siw_wr_state	wr_status;
+	enum siw_wc_status	wc_status;
+	u32			bytes;		/* total bytes to process */
+	u32			processed;	/* bytes processed */
+	int			error;
+};
+
+struct siw_cq {
+	struct ib_cq		ofa_cq;
+	struct siw_objhdr	hdr;
+	enum siw_notify_flags	*notify;
+	spinlock_t		lock;
+	struct siw_cqe		*queue;
+	u32			cq_put;
+	u32			cq_get;
+	u32			num_cqe;
+	int			kernel_verbs;
+};
+
+enum siw_qp_state {
+	SIW_QP_STATE_IDLE	= 0,
+	SIW_QP_STATE_RTR	= 1,
+	SIW_QP_STATE_RTS	= 2,
+	SIW_QP_STATE_CLOSING	= 3,
+	SIW_QP_STATE_TERMINATE	= 4,
+	SIW_QP_STATE_ERROR	= 5,
+	SIW_QP_STATE_COUNT	= 6
+};
+
+enum siw_qp_flags {
+	SIW_RDMA_BIND_ENABLED	= (1 << 0),
+	SIW_RDMA_WRITE_ENABLED	= (1 << 1),
+	SIW_RDMA_READ_ENABLED	= (1 << 2),
+	SIW_SIGNAL_ALL_WR	= (1 << 3),
+	SIW_MPA_CRC		= (1 << 4),
+	SIW_QP_IN_DESTROY	= (1 << 5)
+};
+
+enum siw_qp_attr_mask {
+	SIW_QP_ATTR_STATE		= (1 << 0),
+	SIW_QP_ATTR_ACCESS_FLAGS	= (1 << 1),
+	SIW_QP_ATTR_LLP_HANDLE		= (1 << 2),
+	SIW_QP_ATTR_ORD			= (1 << 3),
+	SIW_QP_ATTR_IRD			= (1 << 4),
+	SIW_QP_ATTR_SQ_SIZE		= (1 << 5),
+	SIW_QP_ATTR_RQ_SIZE		= (1 << 6),
+	SIW_QP_ATTR_MPA			= (1 << 7)
+};
+
+struct siw_sk_upcalls {
+	void	(*sk_state_change)(struct sock *sk);
+	void	(*sk_data_ready)(struct sock *sk, int bytes);
+	void	(*sk_write_space)(struct sock *sk);
+	void	(*sk_error_report)(struct sock *sk);
+};
+
+struct siw_srq {
+	struct ib_srq		ofa_srq;
+	struct siw_pd		*pd;
+	atomic_t		rq_index;
+	spinlock_t		lock;
+	u32			max_sge;
+	atomic_t		space;	/* current space for posting wqe's */
+	u32			limit;	/* low watermark for async event */
+	struct siw_rqe		*recvq;
+	u32			rq_put;
+	u32			rq_get;
+	u32			num_rqe;/* max # of wqe's allowed */
+	char			armed;	/* inform user if limit hit */
+	char			kernel_verbs; /* '1' if kernel client */
+};
+
+struct siw_qp_attrs {
+	enum siw_qp_state	state;
+	char			terminate_buffer[52];
+	u32			terminate_msg_length;
+	u32			ddp_rdmap_version; /* 0 or 1 */
+	char			*stream_msg_buf;
+	u32			stream_msg_buf_length;
+	u32			rq_hiwat;
+	u32			sq_size;
+	u32			rq_size;
+	u32			orq_size;
+	u32			irq_size;
+	u32			sq_max_sges;
+	u32			sq_max_sges_rdmaw;
+	u32			rq_max_sges;
+	enum siw_qp_flags	flags;
+
+	struct socket		*llp_stream_handle;
+};
+
+enum siw_tx_ctx {
+	SIW_SEND_HDR = 0,	/* start or continue sending HDR */
+	SIW_SEND_DATA = 1,	/* start or continue sending DDP payload */
+	SIW_SEND_TRAILER = 2,	/* start or continue sending TRAILER */
+	SIW_SEND_SHORT_FPDU = 3 /* send whole FPDU hdr|data|trailer at once */
+};
+
+enum siw_rx_state {
+	SIW_GET_HDR = 0,	/* await new hdr or within hdr */
+	SIW_GET_DATA_START = 1,	/* start of inbound DDP payload */
+	SIW_GET_DATA_MORE = 2,	/* continuation of (misaligned) DDP payload */
+	SIW_GET_TRAILER	= 3	/* await new trailer or within trailer */
+};
+
+
+struct siw_iwarp_rx {
+	struct sk_buff		*skb;
+	union iwarp_hdrs	hdr;
+	struct mpa_trailer	trailer;
+	/*
+	 * local destination memory of inbound iwarp operation.
+	 * valid, according to wqe->wr_status
+	 */
+	struct siw_wqe		wqe_active;
+
+	struct shash_desc	*mpa_crc_hd;
+	/*
+	 * Next expected DDP MSN for each QN +
+	 * expected steering tag +
+	 * expected DDP tagget offset (all HBO)
+	 */
+	u32			ddp_msn[RDMAP_UNTAGGED_QN_COUNT];
+	u32			ddp_stag;
+	u64			ddp_to;
+
+	/*
+	 * For each FPDU, main RX loop runs through 3 stages:
+	 * Receiving protocol headers, placing DDP payload and receiving
+	 * trailer information (CRC + eventual padding).
+	 * Next two variables keep state on receive status of the
+	 * current FPDU part (hdr, data, trailer).
+	 */
+	int			fpdu_part_rcvd;/* bytes in pkt part copied */
+	int			fpdu_part_rem; /* bytes in pkt part not seen */
+
+	int			skb_new;      /* pending unread bytes in skb */
+	int			skb_offset;   /* offset in skb */
+	int			skb_copied;   /* processed bytes in skb */
+
+	int			pbl_idx;	/* Index into current PBL */
+
+	int			sge_idx;	/* current sge in rx */
+	unsigned int		sge_off;	/* already rcvd in curr. sge */
+
+	enum siw_rx_state	state;
+
+	u32			inval_stag;
+
+	u8			first_ddp_seg:1,   /* this is first DDP seg */
+				more_ddp_segs:1,   /* more DDP segs expected */
+				rx_suspend:1,	   /* stop rcv DDP segs. */
+				unused:1,
+				prev_rdmap_opcode:4; /* opcode of prev msg */
+	char			pad;		/* # of pad bytes expected */
+};
+
+#define siw_rx_data(qp, rctx)	\
+	(iwarp_pktinfo[__rdmap_opcode(&rctx->hdr.ctrl)].proc_data(qp, rctx))
+
+/*
+ * Shorthands for short packets w/o payload
+ * to be transmitted more efficient.
+ */
+struct siw_send_pkt {
+	struct iwarp_send	send;
+	__be32			crc;
+};
+
+struct siw_write_pkt {
+	struct iwarp_rdma_write	write;
+	__be32			crc;
+};
+
+struct siw_rreq_pkt {
+	struct iwarp_rdma_rreq	rreq;
+	__be32			crc;
+};
+
+struct siw_rresp_pkt {
+	struct iwarp_rdma_rresp	rresp;
+	__be32			crc;
+};
+
+struct siw_iwarp_tx {
+	union {
+		union iwarp_hdrs		hdr;
+
+		/* Generic part of FPDU header */
+		struct iwarp_ctrl		ctrl;
+		struct iwarp_ctrl_untagged	c_untagged;
+		struct iwarp_ctrl_tagged	c_tagged;
+
+		/* FPDU headers */
+		struct iwarp_rdma_write		rwrite;
+		struct iwarp_rdma_rreq		rreq;
+		struct iwarp_rdma_rresp		rresp;
+		struct iwarp_terminate		terminate;
+		struct iwarp_send		send;
+		struct iwarp_send_inv		send_inv;
+
+		/* complete short FPDUs */
+		struct siw_send_pkt		send_pkt;
+		struct siw_write_pkt		write_pkt;
+		struct siw_rreq_pkt		rreq_pkt;
+		struct siw_rresp_pkt		rresp_pkt;
+	} pkt;
+
+	struct mpa_trailer			trailer;
+	/* DDP MSN for untagged messages */
+	u32			ddp_msn[RDMAP_UNTAGGED_QN_COUNT];
+
+	enum siw_tx_ctx		state;
+	wait_queue_head_t	waitq;
+	u16			ctrl_len;	/* ddp+rdmap hdr */
+	u16			ctrl_sent;
+	int			burst;
+
+	int			bytes_unsent;	/* ddp payload bytes */
+
+	struct shash_desc	*mpa_crc_hd;
+
+	atomic_t		in_use;		/* tx currently under way */
+
+	u8			do_crc:1,	/* do crc for segment */
+				use_sendpage:1,	/* send w/o copy */
+				tx_suspend:1,	/* stop sending DDP segs. */
+				pad:2,		/* # pad in current fpdu */
+				orq_fence:1,	/* ORQ full or Send fenced */
+				unused:2;
+
+	u16			fpdu_len;	/* len of FPDU to tx */
+
+	int			tcp_seglen;	/* remaining tcp seg space */
+
+	struct siw_wqe		wqe_active;
+
+	int			pbl_idx;	/* Index into current PBL */
+	int			sge_idx;	/* current sge in tx */
+	u32			sge_off;	/* already sent in curr. sge */
+	int			in_syscall;	/* TX out of user context */
+};
+
+struct siw_qp {
+	struct ib_qp		ofa_qp;
+	struct siw_objhdr	hdr;
+	struct list_head	devq;
+	int			cpu;
+	int			kernel_verbs;
+	struct siw_iwarp_rx	rx_ctx;
+	struct siw_iwarp_tx	tx_ctx;
+
+	struct siw_cep		*cep;
+	struct rw_semaphore	state_lock;
+
+	struct siw_pd		*pd;
+	struct siw_cq		*scq;
+	struct siw_cq		*rcq;
+	struct siw_srq		*srq;
+
+	struct siw_qp_attrs	attrs;
+
+	struct siw_sqe		*sendq;	/* send queue element array */
+	uint32_t		sq_get;	/* consumer index into sq array */
+	uint32_t		sq_put;	/* kernel prod. index into sq array */
+	struct llist_node	tx_list;
+
+	struct siw_sqe		*irq;	/* inbound read queue element array */
+	uint32_t		irq_get;/* consumer index into irq array */
+	uint32_t		irq_put;/* producer index into irq array */
+
+	struct siw_rqe		*recvq;	/* recv queue element array */
+	uint32_t		rq_get;	/* consumer index into rq array */
+	uint32_t		rq_put;	/* kernel prod. index into rq array */
+
+	struct siw_sqe		*orq; /* outbound read queue element array */
+	uint32_t		orq_get;/* consumer index into orq array */
+	uint32_t		orq_put;/* shared producer index for ORQ */
+
+	spinlock_t		sq_lock;
+	spinlock_t		rq_lock;
+	spinlock_t		orq_lock;
+};
+
+#define RX_QP(rx)		container_of(rx, struct siw_qp, rx_ctx)
+#define TX_QP(tx)		container_of(tx, struct siw_qp, tx_ctx)
+#define QP_ID(qp)		((qp)->hdr.id)
+#define OBJ_ID(obj)		((obj)->hdr.id)
+#define RX_QPID(rx)		QP_ID(RX_QP(rx))
+#define TX_QPID(tx)		QP_ID(TX_QP(tx))
+
+/* helper macros */
+#define tx_wqe(qp)		(&(qp)->tx_ctx.wqe_active)
+#define rx_wqe(qp)		(&(qp)->rx_ctx.wqe_active)
+#define rx_mem(qp)		((qp)->rx_ctx.wqe_active.mem[0].obj)
+#define tx_type(wqe)		((wqe)->sqe.opcode)
+#define rx_type(wqe)		((wqe)->rqe.opcode)
+#define tx_flags(wqe)		((wqe)->sqe.flags)
+
+#define tx_more_wqe(qp)		(!siw_sq_empty(qp) || !siw_irq_empty(qp))
+
+struct iwarp_msg_info {
+	int			hdr_len;
+	struct iwarp_ctrl	ctrl;
+	int	(*proc_data)(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+};
+
+extern struct iwarp_msg_info iwarp_pktinfo[RDMAP_TERMINATE + 1];
+extern struct siw_dev *siw;
+
+
+/* QP general functions */
+int siw_qp_modify(struct siw_qp *qp, struct siw_qp_attrs *attr,
+		  enum siw_qp_attr_mask mask);
+int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl);
+void siw_qp_llp_close(struct siw_qp *qp);
+void siw_qp_cm_drop(struct siw_qp *qp, int when);
+void siw_send_terminate(struct siw_qp *qp, u8 layer, u8 etype, u8 ecode);
+
+
+struct ib_qp *siw_get_ofaqp(struct ib_device *dev, int id);
+void siw_qp_get_ref(struct ib_qp *qp);
+void siw_qp_put_ref(struct ib_qp *qp);
+
+enum siw_qp_state siw_map_ibstate(enum ib_qp_state state);
+
+int siw_check_mem(struct siw_pd *pd, struct siw_mem *mem, u64 addr,
+		  enum siw_access_flags perm, int len);
+int siw_check_sge(struct siw_pd *pd, struct siw_sge *sge,
+		  union siw_mem_resolved *mem, enum siw_access_flags perm,
+		  u32 off, int len);
+int siw_check_sgl(struct siw_pd *pd, struct siw_wqe *wqe,
+		  enum siw_access_flags perm);
+
+void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe);
+int siw_sqe_complete(struct siw_qp *qp, struct siw_sqe *sqe, u32 bytes,
+		     enum siw_wc_status status);
+int siw_rqe_complete(struct siw_qp *qp, struct siw_rqe *rqe, u32 bytes,
+		     enum siw_wc_status status);
+void siw_qp_llp_data_ready(struct sock *sock);
+void siw_qp_llp_write_space(struct sock *sock);
+
+/* SIW user memory management */
+
+#define CHUNK_SHIFT	9	/* sets number of pages per chunk */
+#define PAGES_PER_CHUNK	(_AC(1, UL) << CHUNK_SHIFT)
+#define CHUNK_MASK	(~(PAGES_PER_CHUNK - 1))
+#define PAGE_CHUNK_SIZE	(PAGES_PER_CHUNK * sizeof(struct page *))
+
+/*
+ * siw_get_upage()
+ *
+ * Get page pointer for address on given umem.
+ *
+ * @umem: two dimensional list of page pointers
+ * @addr: user virtual address
+ */
+static inline struct page *siw_get_upage(struct siw_umem *umem, u64 addr)
+{
+	unsigned int	page_idx	= (addr - umem->fp_addr) >> PAGE_SHIFT,
+			chunk_idx	= page_idx >> CHUNK_SHIFT,
+			page_in_chunk	= page_idx & ~CHUNK_MASK;
+
+	if (likely(page_idx < umem->num_pages))
+		return umem->page_chunk[chunk_idx].p[page_in_chunk];
+
+	return NULL;
+}
+
+extern struct siw_umem *siw_umem_get(u64 start, u64 len);
+extern void siw_umem_release(struct siw_umem *umem);
+extern struct siw_pbl *siw_pbl_alloc(u32 num_buf);
+extern u64 siw_pbl_get_buffer(struct siw_pbl *pbl, u64 off, int *len, int *idx);
+extern void siw_pbl_free(struct siw_pbl *pbl);
+
+
+/* QP TX path functions */
+extern int siw_run_sq(void *arg);
+extern int siw_qp_sq_process(struct siw_qp *qp);
+extern int siw_sq_start(struct siw_qp *qp);
+extern int siw_activate_tx(struct siw_qp *qp);
+extern void siw_stop_tx_thread(int nr_cpu);
+
+/* QP RX path functions */
+extern int siw_proc_send(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+extern int siw_proc_rreq(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+extern int siw_proc_rresp(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+extern int siw_proc_write(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+extern int siw_proc_terminate(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+extern int siw_proc_unsupp(struct siw_qp *qp, struct siw_iwarp_rx *rx);
+
+extern int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb,
+			   unsigned int off, size_t len);
+
+/* MPA utilities */
+static inline int siw_crc_array(struct shash_desc *desc, u8 *start,
+				size_t len)
+{
+	return crypto_shash_update(desc, start, len);
+}
+
+static inline int siw_crc_page(struct shash_desc *desc, struct page *p,
+			       int off, int len)
+{
+	return crypto_shash_update(desc, page_address(p) + off, len);
+}
+
+extern struct task_struct *qp_tx_thread[];
+extern int default_tx_cpu;
+
+
+/* Varia */
+extern void siw_cq_flush(struct siw_cq *cq);
+extern void siw_sq_flush(struct siw_qp *qp);
+extern void siw_rq_flush(struct siw_qp *qp);
+extern int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc);
+
+/* RDMA core event dipatching */
+extern void siw_qp_event(struct siw_qp *qp, enum ib_event_type type);
+extern void siw_cq_event(struct siw_cq *cq, enum ib_event_type type);
+extern void siw_srq_event(struct siw_srq *srq, enum ib_event_type type);
+extern void siw_port_event(struct siw_dev *dev, u8 port,
+			   enum ib_event_type type);
+
+
+static inline struct siw_qp *siw_qp_ofa2siw(struct ib_qp *ofa_qp)
+{
+	return container_of(ofa_qp, struct siw_qp, ofa_qp);
+}
+
+static inline int siw_sq_empty(struct siw_qp *qp)
+{
+	return qp->sendq[qp->sq_get % qp->attrs.sq_size].flags == 0;
+}
+
+static inline struct siw_sqe *sq_get_next(struct siw_qp *qp)
+{
+	struct siw_sqe *sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
+
+	if (sqe->flags & SIW_WQE_VALID)
+		return sqe;
+
+	return NULL;
+}
+
+static inline struct siw_sqe *orq_get_current(struct siw_qp *qp)
+{
+	return &qp->orq[qp->orq_get % qp->attrs.orq_size];
+}
+
+static inline struct siw_sqe *orq_get_tail(struct siw_qp *qp)
+{
+	if (likely(qp->attrs.orq_size))
+		return &qp->orq[qp->orq_put % qp->attrs.orq_size];
+
+	pr_warn("QP[%d]: ORQ has zero length", QP_ID(qp));
+	return NULL;
+}
+
+static inline struct siw_sqe *orq_get_free(struct siw_qp *qp)
+{
+	struct siw_sqe *orq_e = orq_get_tail(qp);
+
+	if (orq_e && orq_e->flags == 0)
+		return orq_e;
+
+	return NULL;
+}
+
+static inline int siw_orq_empty(struct siw_qp *qp)
+{
+	return qp->orq[qp->orq_get % qp->attrs.orq_size].flags == 0 ? 1 : 0;
+}
+
+static inline struct siw_sqe *irq_alloc_free(struct siw_qp *qp)
+{
+	struct siw_sqe *irq_e = &qp->irq[qp->irq_put % qp->attrs.irq_size];
+
+	if (irq_e->flags == 0) {
+		qp->irq_put++;
+		return irq_e;
+	}
+	return NULL;
+}
+
+static inline int siw_irq_empty(struct siw_qp *qp)
+{
+	return qp->irq[qp->irq_get % qp->attrs.irq_size].flags == 0;
+}
+
+static inline struct siw_mr *siw_mem2mr(struct siw_mem *m)
+{
+	if (!SIW_MEM_IS_MW(m))
+		return container_of(m, struct siw_mr, mem);
+	return m->mr;
+}
+
+#endif
-- 
2.13.6

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