verbs.h

/*
 * Copyright(c) 2015, 2016 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.
 *
 */

#ifndef HFI1_VERBS_H
#define HFI1_VERBS_H

#include <linux/types.h>
#include <linux/seqlock.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/kref.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_mad.h>
#include <rdma/rdma_vt.h>
#include <rdma/rdmavt_qp.h>
#include <rdma/rdmavt_cq.h>

struct hfi1_ctxtdata;
struct hfi1_pportdata;
struct hfi1_devdata;
struct hfi1_packet;

#include "iowait.h"

#define HFI1_MAX_RDMA_ATOMIC     16
#define HFI1_GUIDS_PER_PORT	5

/*
 * Increment this value if any changes that break userspace ABI
 * compatibility are made.
 */
#define HFI1_UVERBS_ABI_VERSION       2

#define IB_SEQ_NAK	(3 << 29)

/* AETH NAK opcode values */
#define IB_RNR_NAK                      0x20
#define IB_NAK_PSN_ERROR                0x60
#define IB_NAK_INVALID_REQUEST          0x61
#define IB_NAK_REMOTE_ACCESS_ERROR      0x62
#define IB_NAK_REMOTE_OPERATIONAL_ERROR 0x63
#define IB_NAK_INVALID_RD_REQUEST       0x64

/* IB Performance Manager status values */
#define IB_PMA_SAMPLE_STATUS_DONE       0x00
#define IB_PMA_SAMPLE_STATUS_STARTED    0x01
#define IB_PMA_SAMPLE_STATUS_RUNNING    0x02

/* Mandatory IB performance counter select values. */
#define IB_PMA_PORT_XMIT_DATA   cpu_to_be16(0x0001)
#define IB_PMA_PORT_RCV_DATA    cpu_to_be16(0x0002)
#define IB_PMA_PORT_XMIT_PKTS   cpu_to_be16(0x0003)
#define IB_PMA_PORT_RCV_PKTS    cpu_to_be16(0x0004)
#define IB_PMA_PORT_XMIT_WAIT   cpu_to_be16(0x0005)

#define HFI1_VENDOR_IPG		cpu_to_be16(0xFFA0)

#define IB_BTH_REQ_ACK		BIT(31)
#define IB_BTH_SOLICITED	BIT(23)
#define IB_BTH_MIG_REQ		BIT(22)

#define IB_GRH_VERSION		6
#define IB_GRH_VERSION_MASK	0xF
#define IB_GRH_VERSION_SHIFT	28
#define IB_GRH_TCLASS_MASK	0xFF
#define IB_GRH_TCLASS_SHIFT	20
#define IB_GRH_FLOW_MASK	0xFFFFF
#define IB_GRH_FLOW_SHIFT	0
#define IB_GRH_NEXT_HDR		0x1B

#define IB_DEFAULT_GID_PREFIX	cpu_to_be64(0xfe80000000000000ULL)

/* flags passed by hfi1_ib_rcv() */
enum {
	HFI1_HAS_GRH = (1 << 0),
};

struct ib_reth {
	__be64 vaddr;
	__be32 rkey;
	__be32 length;
} __packed;

struct ib_atomic_eth {
	__be32 vaddr[2];        /* unaligned so access as 2 32-bit words */
	__be32 rkey;
	__be64 swap_data;
	__be64 compare_data;
} __packed;

union ib_ehdrs {
	struct {
		__be32 deth[2];
		__be32 imm_data;
	} ud;
	struct {
		struct ib_reth reth;
		__be32 imm_data;
	} rc;
	struct {
		__be32 aeth;
		__be32 atomic_ack_eth[2];
	} at;
	__be32 imm_data;
	__be32 aeth;
	__be32 ieth;
	struct ib_atomic_eth atomic_eth;
}  __packed;

struct hfi1_other_headers {
	__be32 bth[3];
	union ib_ehdrs u;
} __packed;

/*
 * Note that UD packets with a GRH header are 8+40+12+8 = 68 bytes
 * long (72 w/ imm_data).  Only the first 56 bytes of the IB header
 * will be in the eager header buffer.  The remaining 12 or 16 bytes
 * are in the data buffer.
 */
struct hfi1_ib_header {
	__be16 lrh[4];
	union {
		struct {
			struct ib_grh grh;
			struct hfi1_other_headers oth;
		} l;
		struct hfi1_other_headers oth;
	} u;
} __packed;

struct hfi1_ahg_info {
	u32 ahgdesc[2];
	u16 tx_flags;
	u8 ahgcount;
	u8 ahgidx;
};

struct hfi1_pio_header {
	__le64 pbc;
	struct hfi1_ib_header hdr;
} __packed;

/*
 * hfi1 specific data structures that will be hidden from rvt after the queue
 * pair is made common
 */
struct hfi1_qp_priv {
	struct hfi1_ahg_info *s_ahg;              /* ahg info for next header */
	struct sdma_engine *s_sde;                /* current sde */
	struct send_context *s_sendcontext;       /* current sendcontext */
	u8 s_sc;		                  /* SC[0..4] for next packet */
	u8 r_adefered;                            /* number of acks defered */
	struct iowait s_iowait;
	struct timer_list s_rnr_timer;
	struct rvt_qp *owner;
};

/*
 * This structure is used to hold commonly lookedup and computed values during
 * the send engine progress.
 */
struct hfi1_pkt_state {
	struct hfi1_ibdev *dev;
	struct hfi1_ibport *ibp;
	struct hfi1_pportdata *ppd;
	struct verbs_txreq *s_txreq;
	unsigned long flags;
};

#define HFI1_PSN_CREDIT  16

struct hfi1_opcode_stats {
	u64 n_packets;          /* number of packets */
	u64 n_bytes;            /* total number of bytes */
};

struct hfi1_opcode_stats_perctx {
	struct hfi1_opcode_stats stats[256];
};

static inline void inc_opstats(
	u32 tlen,
	struct hfi1_opcode_stats *stats)
{
#ifdef CONFIG_DEBUG_FS
	stats->n_bytes += tlen;
	stats->n_packets++;
#endif
}

struct hfi1_ibport {
	struct rvt_qp __rcu *qp[2];
	struct rvt_ibport rvp;

	__be64 guids[HFI1_GUIDS_PER_PORT	- 1];	/* writable GUIDs */

	/* the first 16 entries are sl_to_vl for !OPA */
	u8 sl_to_sc[32];
	u8 sc_to_sl[32];
};

struct hfi1_ibdev {
	struct rvt_dev_info rdi; /* Must be first */

	/* QP numbers are shared by all IB ports */
	/* protect wait lists */
	seqlock_t iowait_lock;
	struct list_head txwait;        /* list for wait verbs_txreq */
	struct list_head memwait;       /* list for wait kernel memory */
	struct list_head txreq_free;
	struct kmem_cache *verbs_txreq_cache;
	struct timer_list mem_timer;

	u64 n_piowait;
	u64 n_piodrain;
	u64 n_txwait;
	u64 n_kmem_wait;

#ifdef CONFIG_DEBUG_FS
	/* per HFI debugfs */
	struct dentry *hfi1_ibdev_dbg;
	/* per HFI symlinks to above */
	struct dentry *hfi1_ibdev_link;
#endif
};

static inline struct hfi1_ibdev *to_idev(struct ib_device *ibdev)
{
	struct rvt_dev_info *rdi;

	rdi = container_of(ibdev, struct rvt_dev_info, ibdev);
	return container_of(rdi, struct hfi1_ibdev, rdi);
}

static inline struct rvt_qp *iowait_to_qp(struct  iowait *s_iowait)
{
	struct hfi1_qp_priv *priv;

	priv = container_of(s_iowait, struct hfi1_qp_priv, s_iowait);
	return priv->owner;
}

/*
 * Send if not busy or waiting for I/O and either
 * a RC response is pending or we can process send work requests.
 */
static inline int hfi1_send_ok(struct rvt_qp *qp)
{
	return !(qp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT_IO)) &&
		(qp->s_hdrwords || (qp->s_flags & RVT_S_RESP_PENDING) ||
		 !(qp->s_flags & RVT_S_ANY_WAIT_SEND));
}

/*
 * This must be called with s_lock held.
 */
void hfi1_bad_pqkey(struct hfi1_ibport *ibp, __be16 trap_num, u32 key, u32 sl,
		    u32 qp1, u32 qp2, u16 lid1, u16 lid2);
void hfi1_cap_mask_chg(struct rvt_dev_info *rdi, u8 port_num);
void hfi1_sys_guid_chg(struct hfi1_ibport *ibp);
void hfi1_node_desc_chg(struct hfi1_ibport *ibp);
int hfi1_process_mad(struct ib_device *ibdev, int mad_flags, u8 port,
		     const struct ib_wc *in_wc, const struct ib_grh *in_grh,
		     const struct ib_mad_hdr *in_mad, size_t in_mad_size,
		     struct ib_mad_hdr *out_mad, size_t *out_mad_size,
		     u16 *out_mad_pkey_index);

/*
 * The PSN_MASK and PSN_SHIFT allow for
 * 1) comparing two PSNs
 * 2) returning the PSN with any upper bits masked
 * 3) returning the difference between to PSNs
 *
 * The number of significant bits in the PSN must
 * necessarily be at least one bit less than
 * the container holding the PSN.
 */
#ifndef CONFIG_HFI1_VERBS_31BIT_PSN
#define PSN_MASK 0xFFFFFF
#define PSN_SHIFT 8
#else
#define PSN_MASK 0x7FFFFFFF
#define PSN_SHIFT 1
#endif
#define PSN_MODIFY_MASK 0xFFFFFF

/*
 * Compare the lower 24 bits of the msn values.
 * Returns an integer <, ==, or > than zero.
 */
static inline int cmp_msn(u32 a, u32 b)
{
	return (((int)a) - ((int)b)) << 8;
}

/*
 * Compare two PSNs
 * Returns an integer <, ==, or > than zero.
 */
static inline int cmp_psn(u32 a, u32 b)
{
	return (((int)a) - ((int)b)) << PSN_SHIFT;
}

/*
 * Return masked PSN
 */
static inline u32 mask_psn(u32 a)
{
	return a & PSN_MASK;
}

/*
 * Return delta between two PSNs
 */
static inline u32 delta_psn(u32 a, u32 b)
{
	return (((int)a - (int)b) << PSN_SHIFT) >> PSN_SHIFT;
}

struct verbs_txreq;
void hfi1_put_txreq(struct verbs_txreq *tx);

int hfi1_verbs_send(struct rvt_qp *qp, struct hfi1_pkt_state *ps);

void hfi1_copy_sge(struct rvt_sge_state *ss, void *data, u32 length,
		   int release, int copy_last);

void hfi1_skip_sge(struct rvt_sge_state *ss, u32 length, int release);

void hfi1_cnp_rcv(struct hfi1_packet *packet);

void hfi1_uc_rcv(struct hfi1_packet *packet);

void hfi1_rc_rcv(struct hfi1_packet *packet);

void hfi1_rc_hdrerr(
	struct hfi1_ctxtdata *rcd,
	struct hfi1_ib_header *hdr,
	u32 rcv_flags,
	struct rvt_qp *qp);

u8 ah_to_sc(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);

struct ib_ah *hfi1_create_qp0_ah(struct hfi1_ibport *ibp, u16 dlid);

void hfi1_rc_rnr_retry(unsigned long arg);
void hfi1_add_rnr_timer(struct rvt_qp *qp, u32 to);
void hfi1_rc_timeout(unsigned long arg);
void hfi1_del_timers_sync(struct rvt_qp *qp);
void hfi1_stop_rc_timers(struct rvt_qp *qp);

void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_ib_header *hdr);

void hfi1_rc_error(struct rvt_qp *qp, enum ib_wc_status err);

void hfi1_ud_rcv(struct hfi1_packet *packet);

int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey);

int hfi1_rvt_get_rwqe(struct rvt_qp *qp, int wr_id_only);

void hfi1_migrate_qp(struct rvt_qp *qp);

int hfi1_check_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
			 int attr_mask, struct ib_udata *udata);

void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
		    int attr_mask, struct ib_udata *udata);

int hfi1_check_send_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe);

extern const u32 rc_only_opcode;
extern const u32 uc_only_opcode;

static inline u8 get_opcode(struct hfi1_ib_header *h)
{
	u16 lnh = be16_to_cpu(h->lrh[0]) & 3;

	if (lnh == IB_LNH_IBA_LOCAL)
		return be32_to_cpu(h->u.oth.bth[0]) >> 24;
	else
		return be32_to_cpu(h->u.l.oth.bth[0]) >> 24;
}

int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_ib_header *hdr,
		       int has_grh, struct rvt_qp *qp, u32 bth0);

u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
		  struct ib_global_route *grh, u32 hwords, u32 nwords);

void hfi1_make_ruc_header(struct rvt_qp *qp, struct hfi1_other_headers *ohdr,
			  u32 bth0, u32 bth2, int middle,
			  struct hfi1_pkt_state *ps);

void _hfi1_do_send(struct work_struct *work);

void hfi1_do_send(struct rvt_qp *qp);

void hfi1_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
			enum ib_wc_status status);

void hfi1_send_rc_ack(struct hfi1_ctxtdata *, struct rvt_qp *qp, int is_fecn);

int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps);

int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps);

int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps);

int hfi1_register_ib_device(struct hfi1_devdata *);

void hfi1_unregister_ib_device(struct hfi1_devdata *);

void hfi1_ib_rcv(struct hfi1_packet *packet);

unsigned hfi1_get_npkeys(struct hfi1_devdata *);

int hfi1_verbs_send_dma(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
			u64 pbc);

int hfi1_verbs_send_pio(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
			u64 pbc);

int hfi1_wss_init(void);
void hfi1_wss_exit(void);

/* platform specific: return the lowest level cache (llc) size, in KiB */
static inline int wss_llc_size(void)
{
	/* assume that the boot CPU value is universal for all CPUs */
	return boot_cpu_data.x86_cache_size;
}

/* platform specific: cacheless copy */
static inline void cacheless_memcpy(void *dst, void *src, size_t n)
{
	/*
	 * Use the only available X64 cacheless copy.  Add a __user cast
	 * to quiet sparse.  The src agument is already in the kernel so
	 * there are no security issues.  The extra fault recovery machinery
	 * is not invoked.
	 */
	__copy_user_nocache(dst, (void __user *)src, n, 0);
}

extern const enum ib_wc_opcode ib_hfi1_wc_opcode[];

extern const u8 hdr_len_by_opcode[];

extern const int ib_rvt_state_ops[];

extern __be64 ib_hfi1_sys_image_guid;    /* in network order */

extern unsigned int hfi1_max_cqes;

extern unsigned int hfi1_max_cqs;

extern unsigned int hfi1_max_qp_wrs;

extern unsigned int hfi1_max_qps;

extern unsigned int hfi1_max_sges;

extern unsigned int hfi1_max_mcast_grps;

extern unsigned int hfi1_max_mcast_qp_attached;

extern unsigned int hfi1_max_srqs;

extern unsigned int hfi1_max_srq_sges;

extern unsigned int hfi1_max_srq_wrs;

extern unsigned short piothreshold;

extern const u32 ib_hfi1_rnr_table[];

#endif                          /* HFI1_VERBS_H */