fcloop.c 28.7 KB
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/*
 * Copyright (c) 2016 Avago Technologies.  All rights reserved.
 *
 * 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.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
 * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
 * See the GNU General Public License for more details, a copy of which
 * can be found in the file COPYING included with this package
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/parser.h>
#include <uapi/scsi/fc/fc_fs.h>

#include "../host/nvme.h"
#include "../target/nvmet.h"
#include <linux/nvme-fc-driver.h>
#include <linux/nvme-fc.h>


enum {
	NVMF_OPT_ERR		= 0,
	NVMF_OPT_WWNN		= 1 << 0,
	NVMF_OPT_WWPN		= 1 << 1,
	NVMF_OPT_ROLES		= 1 << 2,
	NVMF_OPT_FCADDR		= 1 << 3,
	NVMF_OPT_LPWWNN		= 1 << 4,
	NVMF_OPT_LPWWPN		= 1 << 5,
};

struct fcloop_ctrl_options {
	int			mask;
	u64			wwnn;
	u64			wwpn;
	u32			roles;
	u32			fcaddr;
	u64			lpwwnn;
	u64			lpwwpn;
};

static const match_table_t opt_tokens = {
	{ NVMF_OPT_WWNN,	"wwnn=%s"	},
	{ NVMF_OPT_WWPN,	"wwpn=%s"	},
	{ NVMF_OPT_ROLES,	"roles=%d"	},
	{ NVMF_OPT_FCADDR,	"fcaddr=%x"	},
	{ NVMF_OPT_LPWWNN,	"lpwwnn=%s"	},
	{ NVMF_OPT_LPWWPN,	"lpwwpn=%s"	},
	{ NVMF_OPT_ERR,		NULL		}
};

static int
fcloop_parse_options(struct fcloop_ctrl_options *opts,
		const char *buf)
{
	substring_t args[MAX_OPT_ARGS];
	char *options, *o, *p;
	int token, ret = 0;
	u64 token64;

	options = o = kstrdup(buf, GFP_KERNEL);
	if (!options)
		return -ENOMEM;

	while ((p = strsep(&o, ",\n")) != NULL) {
		if (!*p)
			continue;

		token = match_token(p, opt_tokens, args);
		opts->mask |= token;
		switch (token) {
		case NVMF_OPT_WWNN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->wwnn = token64;
			break;
		case NVMF_OPT_WWPN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->wwpn = token64;
			break;
		case NVMF_OPT_ROLES:
			if (match_int(args, &token)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->roles = token;
			break;
		case NVMF_OPT_FCADDR:
			if (match_hex(args, &token)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->fcaddr = token;
			break;
		case NVMF_OPT_LPWWNN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->lpwwnn = token64;
			break;
		case NVMF_OPT_LPWWPN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			opts->lpwwpn = token64;
			break;
		default:
			pr_warn("unknown parameter or missing value '%s'\n", p);
			ret = -EINVAL;
			goto out_free_options;
		}
	}

out_free_options:
	kfree(options);
	return ret;
}


static int
fcloop_parse_nm_options(struct device *dev, u64 *nname, u64 *pname,
		const char *buf)
{
	substring_t args[MAX_OPT_ARGS];
	char *options, *o, *p;
	int token, ret = 0;
	u64 token64;

	*nname = -1;
	*pname = -1;

	options = o = kstrdup(buf, GFP_KERNEL);
	if (!options)
		return -ENOMEM;

	while ((p = strsep(&o, ",\n")) != NULL) {
		if (!*p)
			continue;

		token = match_token(p, opt_tokens, args);
		switch (token) {
		case NVMF_OPT_WWNN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			*nname = token64;
			break;
		case NVMF_OPT_WWPN:
			if (match_u64(args, &token64)) {
				ret = -EINVAL;
				goto out_free_options;
			}
			*pname = token64;
			break;
		default:
			pr_warn("unknown parameter or missing value '%s'\n", p);
			ret = -EINVAL;
			goto out_free_options;
		}
	}

out_free_options:
	kfree(options);

	if (!ret) {
		if (*nname == -1)
			return -EINVAL;
		if (*pname == -1)
			return -EINVAL;
	}

	return ret;
}


#define LPORT_OPTS	(NVMF_OPT_WWNN | NVMF_OPT_WWPN)

#define RPORT_OPTS	(NVMF_OPT_WWNN | NVMF_OPT_WWPN |  \
			 NVMF_OPT_LPWWNN | NVMF_OPT_LPWWPN)

#define TGTPORT_OPTS	(NVMF_OPT_WWNN | NVMF_OPT_WWPN)

#define ALL_OPTS	(NVMF_OPT_WWNN | NVMF_OPT_WWPN | NVMF_OPT_ROLES | \
			 NVMF_OPT_FCADDR | NVMF_OPT_LPWWNN | NVMF_OPT_LPWWPN)


static DEFINE_SPINLOCK(fcloop_lock);
static LIST_HEAD(fcloop_lports);
static LIST_HEAD(fcloop_nports);

struct fcloop_lport {
	struct nvme_fc_local_port *localport;
	struct list_head lport_list;
	struct completion unreg_done;
};

struct fcloop_rport {
	struct nvme_fc_remote_port *remoteport;
	struct nvmet_fc_target_port *targetport;
	struct fcloop_nport *nport;
	struct fcloop_lport *lport;
};

struct fcloop_tport {
	struct nvmet_fc_target_port *targetport;
	struct nvme_fc_remote_port *remoteport;
	struct fcloop_nport *nport;
	struct fcloop_lport *lport;
};

struct fcloop_nport {
	struct fcloop_rport *rport;
	struct fcloop_tport *tport;
	struct fcloop_lport *lport;
	struct list_head nport_list;
	struct kref ref;
	struct completion rport_unreg_done;
	struct completion tport_unreg_done;
	u64 node_name;
	u64 port_name;
	u32 port_role;
	u32 port_id;
};

struct fcloop_lsreq {
	struct fcloop_tport		*tport;
	struct nvmefc_ls_req		*lsreq;
	struct work_struct		work;
	struct nvmefc_tgt_ls_req	tgt_ls_req;
	int				status;
};

struct fcloop_fcpreq {
	struct fcloop_tport		*tport;
	struct nvmefc_fcp_req		*fcpreq;
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	spinlock_t			reqlock;
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	u16				status;
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	bool				active;
	bool				aborted;
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	struct work_struct		work;
	struct nvmefc_tgt_fcp_req	tgt_fcp_req;
};

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struct fcloop_ini_fcpreq {
	struct nvmefc_fcp_req		*fcpreq;
	struct fcloop_fcpreq		*tfcp_req;
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	struct work_struct		iniwork;
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};
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static inline struct fcloop_lsreq *
tgt_ls_req_to_lsreq(struct nvmefc_tgt_ls_req *tgt_lsreq)
{
	return container_of(tgt_lsreq, struct fcloop_lsreq, tgt_ls_req);
}

static inline struct fcloop_fcpreq *
tgt_fcp_req_to_fcpreq(struct nvmefc_tgt_fcp_req *tgt_fcpreq)
{
	return container_of(tgt_fcpreq, struct fcloop_fcpreq, tgt_fcp_req);
}


static int
fcloop_create_queue(struct nvme_fc_local_port *localport,
			unsigned int qidx, u16 qsize,
			void **handle)
{
	*handle = localport;
	return 0;
}

static void
fcloop_delete_queue(struct nvme_fc_local_port *localport,
			unsigned int idx, void *handle)
{
}


/*
 * Transmit of LS RSP done (e.g. buffers all set). call back up
 * initiator "done" flows.
 */
static void
fcloop_tgt_lsrqst_done_work(struct work_struct *work)
{
	struct fcloop_lsreq *tls_req =
		container_of(work, struct fcloop_lsreq, work);
	struct fcloop_tport *tport = tls_req->tport;
	struct nvmefc_ls_req *lsreq = tls_req->lsreq;

	if (tport->remoteport)
		lsreq->done(lsreq, tls_req->status);
}

static int
fcloop_ls_req(struct nvme_fc_local_port *localport,
			struct nvme_fc_remote_port *remoteport,
			struct nvmefc_ls_req *lsreq)
{
	struct fcloop_lsreq *tls_req = lsreq->private;
	struct fcloop_rport *rport = remoteport->private;
	int ret = 0;

	tls_req->lsreq = lsreq;
	INIT_WORK(&tls_req->work, fcloop_tgt_lsrqst_done_work);

	if (!rport->targetport) {
		tls_req->status = -ECONNREFUSED;
		schedule_work(&tls_req->work);
		return ret;
	}

	tls_req->status = 0;
	tls_req->tport = rport->targetport->private;
	ret = nvmet_fc_rcv_ls_req(rport->targetport, &tls_req->tgt_ls_req,
				 lsreq->rqstaddr, lsreq->rqstlen);

	return ret;
}

static int
fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport,
			struct nvmefc_tgt_ls_req *tgt_lsreq)
{
	struct fcloop_lsreq *tls_req = tgt_ls_req_to_lsreq(tgt_lsreq);
	struct nvmefc_ls_req *lsreq = tls_req->lsreq;

	memcpy(lsreq->rspaddr, tgt_lsreq->rspbuf,
		((lsreq->rsplen < tgt_lsreq->rsplen) ?
				lsreq->rsplen : tgt_lsreq->rsplen));
	tgt_lsreq->done(tgt_lsreq);

	schedule_work(&tls_req->work);

	return 0;
}

/*
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 * FCP IO operation done by initiator abort.
 * call back up initiator "done" flows.
 */
static void
fcloop_tgt_fcprqst_ini_done_work(struct work_struct *work)
{
	struct fcloop_ini_fcpreq *inireq =
		container_of(work, struct fcloop_ini_fcpreq, iniwork);

	inireq->fcpreq->done(inireq->fcpreq);
}

/*
 * FCP IO operation done by target completion.
 * call back up initiator "done" flows.
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 */
static void
fcloop_tgt_fcprqst_done_work(struct work_struct *work)
{
	struct fcloop_fcpreq *tfcp_req =
		container_of(work, struct fcloop_fcpreq, work);
	struct fcloop_tport *tport = tfcp_req->tport;
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	struct nvmefc_fcp_req *fcpreq;
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	spin_lock(&tfcp_req->reqlock);
	fcpreq = tfcp_req->fcpreq;
	spin_unlock(&tfcp_req->reqlock);

	if (tport->remoteport && fcpreq) {
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		fcpreq->status = tfcp_req->status;
		fcpreq->done(fcpreq);
	}
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	kfree(tfcp_req);
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}


static int
fcloop_fcp_req(struct nvme_fc_local_port *localport,
			struct nvme_fc_remote_port *remoteport,
			void *hw_queue_handle,
			struct nvmefc_fcp_req *fcpreq)
{
	struct fcloop_rport *rport = remoteport->private;
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	struct fcloop_ini_fcpreq *inireq = fcpreq->private;
	struct fcloop_fcpreq *tfcp_req;
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	int ret = 0;

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	if (!rport->targetport)
		return -ECONNREFUSED;
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	tfcp_req = kzalloc(sizeof(*tfcp_req), GFP_KERNEL);
	if (!tfcp_req)
		return -ENOMEM;
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	inireq->fcpreq = fcpreq;
	inireq->tfcp_req = tfcp_req;
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	INIT_WORK(&inireq->iniwork, fcloop_tgt_fcprqst_ini_done_work);
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	tfcp_req->fcpreq = fcpreq;
	tfcp_req->tport = rport->targetport->private;
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	spin_lock_init(&tfcp_req->reqlock);
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	INIT_WORK(&tfcp_req->work, fcloop_tgt_fcprqst_done_work);
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	ret = nvmet_fc_rcv_fcp_req(rport->targetport, &tfcp_req->tgt_fcp_req,
				 fcpreq->cmdaddr, fcpreq->cmdlen);

	return ret;
}

static void
fcloop_fcp_copy_data(u8 op, struct scatterlist *data_sg,
			struct scatterlist *io_sg, u32 offset, u32 length)
{
	void *data_p, *io_p;
	u32 data_len, io_len, tlen;

	io_p = sg_virt(io_sg);
	io_len = io_sg->length;

	for ( ; offset; ) {
		tlen = min_t(u32, offset, io_len);
		offset -= tlen;
		io_len -= tlen;
		if (!io_len) {
			io_sg = sg_next(io_sg);
			io_p = sg_virt(io_sg);
			io_len = io_sg->length;
		} else
			io_p += tlen;
	}

	data_p = sg_virt(data_sg);
	data_len = data_sg->length;

	for ( ; length; ) {
		tlen = min_t(u32, io_len, data_len);
		tlen = min_t(u32, tlen, length);

		if (op == NVMET_FCOP_WRITEDATA)
			memcpy(data_p, io_p, tlen);
		else
			memcpy(io_p, data_p, tlen);

		length -= tlen;

		io_len -= tlen;
		if ((!io_len) && (length)) {
			io_sg = sg_next(io_sg);
			io_p = sg_virt(io_sg);
			io_len = io_sg->length;
		} else
			io_p += tlen;

		data_len -= tlen;
		if ((!data_len) && (length)) {
			data_sg = sg_next(data_sg);
			data_p = sg_virt(data_sg);
			data_len = data_sg->length;
		} else
			data_p += tlen;
	}
}

static int
fcloop_fcp_op(struct nvmet_fc_target_port *tgtport,
			struct nvmefc_tgt_fcp_req *tgt_fcpreq)
{
	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
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	struct nvmefc_fcp_req *fcpreq;
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	u32 rsplen = 0, xfrlen = 0;
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	int fcp_err = 0, active, aborted;
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	u8 op = tgt_fcpreq->op;

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	spin_lock(&tfcp_req->reqlock);
	fcpreq = tfcp_req->fcpreq;
	active = tfcp_req->active;
	aborted = tfcp_req->aborted;
	tfcp_req->active = true;
	spin_unlock(&tfcp_req->reqlock);

	if (unlikely(active))
		/* illegal - call while i/o active */
		return -EALREADY;

	if (unlikely(aborted)) {
		/* target transport has aborted i/o prior */
		spin_lock(&tfcp_req->reqlock);
		tfcp_req->active = false;
		spin_unlock(&tfcp_req->reqlock);
		tgt_fcpreq->transferred_length = 0;
		tgt_fcpreq->fcp_error = -ECANCELED;
		tgt_fcpreq->done(tgt_fcpreq);
		return 0;
	}

	/*
	 * if fcpreq is NULL, the I/O has been aborted (from
	 * initiator side). For the target side, act as if all is well
	 * but don't actually move data.
	 */

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	switch (op) {
	case NVMET_FCOP_WRITEDATA:
		xfrlen = tgt_fcpreq->transfer_length;
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		if (fcpreq) {
			fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
					fcpreq->first_sgl, tgt_fcpreq->offset,
					xfrlen);
			fcpreq->transferred_length += xfrlen;
		}
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		break;

	case NVMET_FCOP_READDATA:
	case NVMET_FCOP_READDATA_RSP:
		xfrlen = tgt_fcpreq->transfer_length;
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		if (fcpreq) {
			fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
					fcpreq->first_sgl, tgt_fcpreq->offset,
					xfrlen);
			fcpreq->transferred_length += xfrlen;
		}
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		if (op == NVMET_FCOP_READDATA)
			break;

		/* Fall-Thru to RSP handling */

	case NVMET_FCOP_RSP:
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		if (fcpreq) {
			rsplen = ((fcpreq->rsplen < tgt_fcpreq->rsplen) ?
					fcpreq->rsplen : tgt_fcpreq->rsplen);
			memcpy(fcpreq->rspaddr, tgt_fcpreq->rspaddr, rsplen);
			if (rsplen < tgt_fcpreq->rsplen)
				fcp_err = -E2BIG;
			fcpreq->rcv_rsplen = rsplen;
			fcpreq->status = 0;
		}
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		tfcp_req->status = 0;
		break;

	default:
		fcp_err = -EINVAL;
		break;
	}

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	spin_lock(&tfcp_req->reqlock);
	tfcp_req->active = false;
	spin_unlock(&tfcp_req->reqlock);

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	tgt_fcpreq->transferred_length = xfrlen;
	tgt_fcpreq->fcp_error = fcp_err;
	tgt_fcpreq->done(tgt_fcpreq);

	return 0;
}

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static void
fcloop_tgt_fcp_abort(struct nvmet_fc_target_port *tgtport,
			struct nvmefc_tgt_fcp_req *tgt_fcpreq)
{
	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
	int active;

	/*
	 * mark aborted only in case there were 2 threads in transport
	 * (one doing io, other doing abort) and only kills ops posted
	 * after the abort request
	 */
	spin_lock(&tfcp_req->reqlock);
	active = tfcp_req->active;
	tfcp_req->aborted = true;
	spin_unlock(&tfcp_req->reqlock);

	tfcp_req->status = NVME_SC_FC_TRANSPORT_ABORTED;

	/*
	 * nothing more to do. If io wasn't active, the transport should
	 * immediately call the req_release. If it was active, the op
	 * will complete, and the lldd should call req_release.
	 */
}

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static void
fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
			struct nvmefc_tgt_fcp_req *tgt_fcpreq)
{
	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);

	schedule_work(&tfcp_req->work);
}

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static void
fcloop_ls_abort(struct nvme_fc_local_port *localport,
			struct nvme_fc_remote_port *remoteport,
				struct nvmefc_ls_req *lsreq)
{
}

static void
fcloop_fcp_abort(struct nvme_fc_local_port *localport,
			struct nvme_fc_remote_port *remoteport,
			void *hw_queue_handle,
			struct nvmefc_fcp_req *fcpreq)
{
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	struct fcloop_rport *rport = remoteport->private;
	struct fcloop_ini_fcpreq *inireq = fcpreq->private;
	struct fcloop_fcpreq *tfcp_req = inireq->tfcp_req;

	if (!tfcp_req)
		/* abort has already been called */
		return;

	if (rport->targetport)
		nvmet_fc_rcv_fcp_abort(rport->targetport,
					&tfcp_req->tgt_fcp_req);

	/* break initiator/target relationship for io */
	spin_lock(&tfcp_req->reqlock);
	inireq->tfcp_req = NULL;
	tfcp_req->fcpreq = NULL;
	spin_unlock(&tfcp_req->reqlock);

	/* post the aborted io completion */
	fcpreq->status = -ECANCELED;
	schedule_work(&inireq->iniwork);
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}

static void
fcloop_localport_delete(struct nvme_fc_local_port *localport)
{
	struct fcloop_lport *lport = localport->private;

	/* release any threads waiting for the unreg to complete */
	complete(&lport->unreg_done);
}

static void
fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport)
{
	struct fcloop_rport *rport = remoteport->private;

	/* release any threads waiting for the unreg to complete */
	complete(&rport->nport->rport_unreg_done);
}

static void
fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
{
	struct fcloop_tport *tport = targetport->private;

	/* release any threads waiting for the unreg to complete */
	complete(&tport->nport->tport_unreg_done);
}

#define	FCLOOP_HW_QUEUES		4
#define	FCLOOP_SGL_SEGS			256
#define FCLOOP_DMABOUND_4G		0xFFFFFFFF

669
static struct nvme_fc_port_template fctemplate = {
670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685
	.localport_delete	= fcloop_localport_delete,
	.remoteport_delete	= fcloop_remoteport_delete,
	.create_queue		= fcloop_create_queue,
	.delete_queue		= fcloop_delete_queue,
	.ls_req			= fcloop_ls_req,
	.fcp_io			= fcloop_fcp_req,
	.ls_abort		= fcloop_ls_abort,
	.fcp_abort		= fcloop_fcp_abort,
	.max_hw_queues		= FCLOOP_HW_QUEUES,
	.max_sgl_segments	= FCLOOP_SGL_SEGS,
	.max_dif_sgl_segments	= FCLOOP_SGL_SEGS,
	.dma_boundary		= FCLOOP_DMABOUND_4G,
	/* sizes of additional private data for data structures */
	.local_priv_sz		= sizeof(struct fcloop_lport),
	.remote_priv_sz		= sizeof(struct fcloop_rport),
	.lsrqst_priv_sz		= sizeof(struct fcloop_lsreq),
686
	.fcprqst_priv_sz	= sizeof(struct fcloop_ini_fcpreq),
687 688
};

689
static struct nvmet_fc_target_template tgttemplate = {
690 691 692
	.targetport_delete	= fcloop_targetport_delete,
	.xmt_ls_rsp		= fcloop_xmt_ls_rsp,
	.fcp_op			= fcloop_fcp_op,
693
	.fcp_abort		= fcloop_tgt_fcp_abort,
694
	.fcp_req_release	= fcloop_fcp_req_release,
695 696 697 698 699
	.max_hw_queues		= FCLOOP_HW_QUEUES,
	.max_sgl_segments	= FCLOOP_SGL_SEGS,
	.max_dif_sgl_segments	= FCLOOP_SGL_SEGS,
	.dma_boundary		= FCLOOP_DMABOUND_4G,
	/* optional features */
700 701
	.target_features	= NVMET_FCTGTFEAT_CMD_IN_ISR |
				  NVMET_FCTGTFEAT_OPDONE_IN_ISR,
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	/* sizes of additional private data for data structures */
	.target_priv_sz		= sizeof(struct fcloop_tport),
};

static ssize_t
fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct nvme_fc_port_info pinfo;
	struct fcloop_ctrl_options *opts;
	struct nvme_fc_local_port *localport;
	struct fcloop_lport *lport;
	int ret;

	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	if (!opts)
		return -ENOMEM;

	ret = fcloop_parse_options(opts, buf);
	if (ret)
		goto out_free_opts;

	/* everything there ? */
	if ((opts->mask & LPORT_OPTS) != LPORT_OPTS) {
		ret = -EINVAL;
		goto out_free_opts;
	}

	pinfo.node_name = opts->wwnn;
	pinfo.port_name = opts->wwpn;
	pinfo.port_role = opts->roles;
	pinfo.port_id = opts->fcaddr;

	ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport);
	if (!ret) {
		unsigned long flags;

		/* success */
		lport = localport->private;
		lport->localport = localport;
		INIT_LIST_HEAD(&lport->lport_list);

		spin_lock_irqsave(&fcloop_lock, flags);
		list_add_tail(&lport->lport_list, &fcloop_lports);
		spin_unlock_irqrestore(&fcloop_lock, flags);

		/* mark all of the input buffer consumed */
		ret = count;
	}

out_free_opts:
	kfree(opts);
	return ret ? ret : count;
}


static void
__unlink_local_port(struct fcloop_lport *lport)
{
	list_del(&lport->lport_list);
}

static int
__wait_localport_unreg(struct fcloop_lport *lport)
{
	int ret;

	init_completion(&lport->unreg_done);

	ret = nvme_fc_unregister_localport(lport->localport);

	wait_for_completion(&lport->unreg_done);

	return ret;
}


static ssize_t
fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct fcloop_lport *tlport, *lport = NULL;
	u64 nodename, portname;
	unsigned long flags;
	int ret;

	ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
	if (ret)
		return ret;

	spin_lock_irqsave(&fcloop_lock, flags);

	list_for_each_entry(tlport, &fcloop_lports, lport_list) {
		if (tlport->localport->node_name == nodename &&
		    tlport->localport->port_name == portname) {
			lport = tlport;
			__unlink_local_port(lport);
			break;
		}
	}
	spin_unlock_irqrestore(&fcloop_lock, flags);

	if (!lport)
		return -ENOENT;

	ret = __wait_localport_unreg(lport);

	return ret ? ret : count;
}

static void
fcloop_nport_free(struct kref *ref)
{
	struct fcloop_nport *nport =
		container_of(ref, struct fcloop_nport, ref);
	unsigned long flags;

	spin_lock_irqsave(&fcloop_lock, flags);
	list_del(&nport->nport_list);
	spin_unlock_irqrestore(&fcloop_lock, flags);

	kfree(nport);
}

static void
fcloop_nport_put(struct fcloop_nport *nport)
{
	kref_put(&nport->ref, fcloop_nport_free);
}

static int
fcloop_nport_get(struct fcloop_nport *nport)
{
	return kref_get_unless_zero(&nport->ref);
}

static struct fcloop_nport *
fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
{
	struct fcloop_nport *newnport, *nport = NULL;
	struct fcloop_lport *tmplport, *lport = NULL;
	struct fcloop_ctrl_options *opts;
	unsigned long flags;
	u32 opts_mask = (remoteport) ? RPORT_OPTS : TGTPORT_OPTS;
	int ret;

	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	if (!opts)
		return NULL;

	ret = fcloop_parse_options(opts, buf);
	if (ret)
		goto out_free_opts;

	/* everything there ? */
	if ((opts->mask & opts_mask) != opts_mask) {
		ret = -EINVAL;
		goto out_free_opts;
	}

	newnport = kzalloc(sizeof(*newnport), GFP_KERNEL);
	if (!newnport)
		goto out_free_opts;

	INIT_LIST_HEAD(&newnport->nport_list);
	newnport->node_name = opts->wwnn;
	newnport->port_name = opts->wwpn;
	if (opts->mask & NVMF_OPT_ROLES)
		newnport->port_role = opts->roles;
	if (opts->mask & NVMF_OPT_FCADDR)
		newnport->port_id = opts->fcaddr;
	kref_init(&newnport->ref);

	spin_lock_irqsave(&fcloop_lock, flags);

	list_for_each_entry(tmplport, &fcloop_lports, lport_list) {
		if (tmplport->localport->node_name == opts->wwnn &&
		    tmplport->localport->port_name == opts->wwpn)
			goto out_invalid_opts;

		if (tmplport->localport->node_name == opts->lpwwnn &&
		    tmplport->localport->port_name == opts->lpwwpn)
			lport = tmplport;
	}

	if (remoteport) {
		if (!lport)
			goto out_invalid_opts;
		newnport->lport = lport;
	}

	list_for_each_entry(nport, &fcloop_nports, nport_list) {
		if (nport->node_name == opts->wwnn &&
		    nport->port_name == opts->wwpn) {
			if ((remoteport && nport->rport) ||
			    (!remoteport && nport->tport)) {
				nport = NULL;
				goto out_invalid_opts;
			}

			fcloop_nport_get(nport);

			spin_unlock_irqrestore(&fcloop_lock, flags);

			if (remoteport)
				nport->lport = lport;
			if (opts->mask & NVMF_OPT_ROLES)
				nport->port_role = opts->roles;
			if (opts->mask & NVMF_OPT_FCADDR)
				nport->port_id = opts->fcaddr;
			goto out_free_newnport;
		}
	}

	list_add_tail(&newnport->nport_list, &fcloop_nports);

	spin_unlock_irqrestore(&fcloop_lock, flags);

	kfree(opts);
	return newnport;

out_invalid_opts:
	spin_unlock_irqrestore(&fcloop_lock, flags);
out_free_newnport:
	kfree(newnport);
out_free_opts:
	kfree(opts);
	return nport;
}

static ssize_t
fcloop_create_remote_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct nvme_fc_remote_port *remoteport;
	struct fcloop_nport *nport;
	struct fcloop_rport *rport;
	struct nvme_fc_port_info pinfo;
	int ret;

	nport = fcloop_alloc_nport(buf, count, true);
	if (!nport)
		return -EIO;

	pinfo.node_name = nport->node_name;
	pinfo.port_name = nport->port_name;
	pinfo.port_role = nport->port_role;
	pinfo.port_id = nport->port_id;

	ret = nvme_fc_register_remoteport(nport->lport->localport,
						&pinfo, &remoteport);
	if (ret || !remoteport) {
		fcloop_nport_put(nport);
		return ret;
	}

	/* success */
	rport = remoteport->private;
	rport->remoteport = remoteport;
	rport->targetport = (nport->tport) ?  nport->tport->targetport : NULL;
	if (nport->tport) {
		nport->tport->remoteport = remoteport;
		nport->tport->lport = nport->lport;
	}
	rport->nport = nport;
	rport->lport = nport->lport;
	nport->rport = rport;

970
	return count;
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
}


static struct fcloop_rport *
__unlink_remote_port(struct fcloop_nport *nport)
{
	struct fcloop_rport *rport = nport->rport;

	if (rport && nport->tport)
		nport->tport->remoteport = NULL;
	nport->rport = NULL;

	return rport;
}

static int
__wait_remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
{
	int ret;

	if (!rport)
		return -EALREADY;

	init_completion(&nport->rport_unreg_done);

	ret = nvme_fc_unregister_remoteport(rport->remoteport);
	if (ret)
		return ret;

	wait_for_completion(&nport->rport_unreg_done);

	fcloop_nport_put(nport);

	return ret;
}

static ssize_t
fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct fcloop_nport *nport = NULL, *tmpport;
	static struct fcloop_rport *rport;
	u64 nodename, portname;
	unsigned long flags;
	int ret;

	ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
	if (ret)
		return ret;

	spin_lock_irqsave(&fcloop_lock, flags);

	list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
		if (tmpport->node_name == nodename &&
		    tmpport->port_name == portname && tmpport->rport) {
			nport = tmpport;
			rport = __unlink_remote_port(nport);
			break;
		}
	}

	spin_unlock_irqrestore(&fcloop_lock, flags);

	if (!nport)
		return -ENOENT;

	ret = __wait_remoteport_unreg(nport, rport);

	return ret ? ret : count;
}

static ssize_t
fcloop_create_target_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct nvmet_fc_target_port *targetport;
	struct fcloop_nport *nport;
	struct fcloop_tport *tport;
	struct nvmet_fc_port_info tinfo;
	int ret;

	nport = fcloop_alloc_nport(buf, count, false);
	if (!nport)
		return -EIO;

	tinfo.node_name = nport->node_name;
	tinfo.port_name = nport->port_name;
	tinfo.port_id = nport->port_id;

	ret = nvmet_fc_register_targetport(&tinfo, &tgttemplate, NULL,
						&targetport);
	if (ret) {
		fcloop_nport_put(nport);
		return ret;
	}

	/* success */
	tport = targetport->private;
	tport->targetport = targetport;
	tport->remoteport = (nport->rport) ?  nport->rport->remoteport : NULL;
	if (nport->rport)
		nport->rport->targetport = targetport;
	tport->nport = nport;
	tport->lport = nport->lport;
	nport->tport = tport;

1077
	return count;
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
}


static struct fcloop_tport *
__unlink_target_port(struct fcloop_nport *nport)
{
	struct fcloop_tport *tport = nport->tport;

	if (tport && nport->rport)
		nport->rport->targetport = NULL;
	nport->tport = NULL;

	return tport;
}

static int
__wait_targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
{
	int ret;

	if (!tport)
		return -EALREADY;

	init_completion(&nport->tport_unreg_done);

	ret = nvmet_fc_unregister_targetport(tport->targetport);
	if (ret)
		return ret;

	wait_for_completion(&nport->tport_unreg_done);

	fcloop_nport_put(nport);

	return ret;
}

static ssize_t
fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct fcloop_nport *nport = NULL, *tmpport;
	struct fcloop_tport *tport;
	u64 nodename, portname;
	unsigned long flags;
	int ret;

	ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
	if (ret)
		return ret;

	spin_lock_irqsave(&fcloop_lock, flags);

	list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
		if (tmpport->node_name == nodename &&
		    tmpport->port_name == portname && tmpport->tport) {
			nport = tmpport;
			tport = __unlink_target_port(nport);
			break;
		}
	}

	spin_unlock_irqrestore(&fcloop_lock, flags);

	if (!nport)
		return -ENOENT;

	ret = __wait_targetport_unreg(nport, tport);

	return ret ? ret : count;
}


static DEVICE_ATTR(add_local_port, 0200, NULL, fcloop_create_local_port);
static DEVICE_ATTR(del_local_port, 0200, NULL, fcloop_delete_local_port);
static DEVICE_ATTR(add_remote_port, 0200, NULL, fcloop_create_remote_port);
static DEVICE_ATTR(del_remote_port, 0200, NULL, fcloop_delete_remote_port);
static DEVICE_ATTR(add_target_port, 0200, NULL, fcloop_create_target_port);
static DEVICE_ATTR(del_target_port, 0200, NULL, fcloop_delete_target_port);

static struct attribute *fcloop_dev_attrs[] = {
	&dev_attr_add_local_port.attr,
	&dev_attr_del_local_port.attr,
	&dev_attr_add_remote_port.attr,
	&dev_attr_del_remote_port.attr,
	&dev_attr_add_target_port.attr,
	&dev_attr_del_target_port.attr,
	NULL
};

static struct attribute_group fclopp_dev_attrs_group = {
	.attrs		= fcloop_dev_attrs,
};

static const struct attribute_group *fcloop_dev_attr_groups[] = {
	&fclopp_dev_attrs_group,
	NULL,
};

static struct class *fcloop_class;
static struct device *fcloop_device;


static int __init fcloop_init(void)
{
	int ret;

	fcloop_class = class_create(THIS_MODULE, "fcloop");
	if (IS_ERR(fcloop_class)) {
		pr_err("couldn't register class fcloop\n");
		ret = PTR_ERR(fcloop_class);
		return ret;
	}

	fcloop_device = device_create_with_groups(
				fcloop_class, NULL, MKDEV(0, 0), NULL,
				fcloop_dev_attr_groups, "ctl");
	if (IS_ERR(fcloop_device)) {
		pr_err("couldn't create ctl device!\n");
		ret = PTR_ERR(fcloop_device);
		goto out_destroy_class;
	}

	get_device(fcloop_device);

	return 0;

out_destroy_class:
	class_destroy(fcloop_class);
	return ret;
}

static void __exit fcloop_exit(void)
{
	struct fcloop_lport *lport;
	struct fcloop_nport *nport;
	struct fcloop_tport *tport;
	struct fcloop_rport *rport;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&fcloop_lock, flags);

	for (;;) {
		nport = list_first_entry_or_null(&fcloop_nports,
						typeof(*nport), nport_list);
		if (!nport)
			break;

		tport = __unlink_target_port(nport);
		rport = __unlink_remote_port(nport);

		spin_unlock_irqrestore(&fcloop_lock, flags);

		ret = __wait_targetport_unreg(nport, tport);
		if (ret)
			pr_warn("%s: Failed deleting target port\n", __func__);

		ret = __wait_remoteport_unreg(nport, rport);
		if (ret)
			pr_warn("%s: Failed deleting remote port\n", __func__);

		spin_lock_irqsave(&fcloop_lock, flags);
	}

	for (;;) {
		lport = list_first_entry_or_null(&fcloop_lports,
						typeof(*lport), lport_list);
		if (!lport)
			break;

		__unlink_local_port(lport);

		spin_unlock_irqrestore(&fcloop_lock, flags);

		ret = __wait_localport_unreg(lport);
		if (ret)
			pr_warn("%s: Failed deleting local port\n", __func__);

		spin_lock_irqsave(&fcloop_lock, flags);
	}

	spin_unlock_irqrestore(&fcloop_lock, flags);

	put_device(fcloop_device);

	device_destroy(fcloop_class, MKDEV(0, 0));
	class_destroy(fcloop_class);
}

module_init(fcloop_init);
module_exit(fcloop_exit);

MODULE_LICENSE("GPL v2");