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path: root/drivers/nvme/target/fcloop.c
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-rw-r--r--drivers/nvme/target/fcloop.c1656
1 files changed, 1656 insertions, 0 deletions
diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
new file mode 100644
index 0000000000..c65a73433c
--- /dev/null
+++ b/drivers/nvme/target/fcloop.c
@@ -0,0 +1,1656 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016 Avago Technologies. All rights reserved.
+ */
+#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_verify_addr(substring_t *s)
+{
+ size_t blen = s->to - s->from + 1;
+
+ if (strnlen(s->from, blen) != NVME_FC_TRADDR_HEXNAMELEN + 2 ||
+ strncmp(s->from, "0x", 2))
+ return -EINVAL;
+
+ return 0;
+}
+
+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 (fcloop_verify_addr(args) ||
+ match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->wwnn = token64;
+ break;
+ case NVMF_OPT_WWPN:
+ if (fcloop_verify_addr(args) ||
+ 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 (fcloop_verify_addr(args) ||
+ match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->lpwwnn = token64;
+ break;
+ case NVMF_OPT_LPWWPN:
+ if (fcloop_verify_addr(args) ||
+ 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 (fcloop_verify_addr(args) ||
+ match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ *nname = token64;
+ break;
+ case NVMF_OPT_WWPN:
+ if (fcloop_verify_addr(args) ||
+ 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)
+
+
+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_lport_priv {
+ struct fcloop_lport *lport;
+};
+
+struct fcloop_rport {
+ struct nvme_fc_remote_port *remoteport;
+ struct nvmet_fc_target_port *targetport;
+ struct fcloop_nport *nport;
+ struct fcloop_lport *lport;
+ spinlock_t lock;
+ struct list_head ls_list;
+ struct work_struct ls_work;
+};
+
+struct fcloop_tport {
+ struct nvmet_fc_target_port *targetport;
+ struct nvme_fc_remote_port *remoteport;
+ struct fcloop_nport *nport;
+ struct fcloop_lport *lport;
+ spinlock_t lock;
+ struct list_head ls_list;
+ struct work_struct ls_work;
+};
+
+struct fcloop_nport {
+ struct fcloop_rport *rport;
+ struct fcloop_tport *tport;
+ struct fcloop_lport *lport;
+ struct list_head nport_list;
+ struct kref ref;
+ u64 node_name;
+ u64 port_name;
+ u32 port_role;
+ u32 port_id;
+};
+
+struct fcloop_lsreq {
+ struct nvmefc_ls_req *lsreq;
+ struct nvmefc_ls_rsp ls_rsp;
+ int lsdir; /* H2T or T2H */
+ int status;
+ struct list_head ls_list; /* fcloop_rport->ls_list */
+};
+
+struct fcloop_rscn {
+ struct fcloop_tport *tport;
+ struct work_struct work;
+};
+
+enum {
+ INI_IO_START = 0,
+ INI_IO_ACTIVE = 1,
+ INI_IO_ABORTED = 2,
+ INI_IO_COMPLETED = 3,
+};
+
+struct fcloop_fcpreq {
+ struct fcloop_tport *tport;
+ struct nvmefc_fcp_req *fcpreq;
+ spinlock_t reqlock;
+ u16 status;
+ u32 inistate;
+ bool active;
+ bool aborted;
+ struct kref ref;
+ struct work_struct fcp_rcv_work;
+ struct work_struct abort_rcv_work;
+ struct work_struct tio_done_work;
+ struct nvmefc_tgt_fcp_req tgt_fcp_req;
+};
+
+struct fcloop_ini_fcpreq {
+ struct nvmefc_fcp_req *fcpreq;
+ struct fcloop_fcpreq *tfcp_req;
+ spinlock_t inilock;
+};
+
+static inline struct fcloop_lsreq *
+ls_rsp_to_lsreq(struct nvmefc_ls_rsp *lsrsp)
+{
+ return container_of(lsrsp, struct fcloop_lsreq, ls_rsp);
+}
+
+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)
+{
+}
+
+static void
+fcloop_rport_lsrqst_work(struct work_struct *work)
+{
+ struct fcloop_rport *rport =
+ container_of(work, struct fcloop_rport, ls_work);
+ struct fcloop_lsreq *tls_req;
+
+ spin_lock(&rport->lock);
+ for (;;) {
+ tls_req = list_first_entry_or_null(&rport->ls_list,
+ struct fcloop_lsreq, ls_list);
+ if (!tls_req)
+ break;
+
+ list_del(&tls_req->ls_list);
+ spin_unlock(&rport->lock);
+
+ tls_req->lsreq->done(tls_req->lsreq, tls_req->status);
+ /*
+ * callee may free memory containing tls_req.
+ * do not reference lsreq after this.
+ */
+
+ spin_lock(&rport->lock);
+ }
+ spin_unlock(&rport->lock);
+}
+
+static int
+fcloop_h2t_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_LIST_HEAD(&tls_req->ls_list);
+
+ if (!rport->targetport) {
+ tls_req->status = -ECONNREFUSED;
+ spin_lock(&rport->lock);
+ list_add_tail(&rport->ls_list, &tls_req->ls_list);
+ spin_unlock(&rport->lock);
+ queue_work(nvmet_wq, &rport->ls_work);
+ return ret;
+ }
+
+ tls_req->status = 0;
+ ret = nvmet_fc_rcv_ls_req(rport->targetport, rport,
+ &tls_req->ls_rsp,
+ lsreq->rqstaddr, lsreq->rqstlen);
+
+ return ret;
+}
+
+static int
+fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
+ struct nvmefc_ls_rsp *lsrsp)
+{
+ struct fcloop_lsreq *tls_req = ls_rsp_to_lsreq(lsrsp);
+ struct nvmefc_ls_req *lsreq = tls_req->lsreq;
+ struct fcloop_tport *tport = targetport->private;
+ struct nvme_fc_remote_port *remoteport = tport->remoteport;
+ struct fcloop_rport *rport;
+
+ memcpy(lsreq->rspaddr, lsrsp->rspbuf,
+ ((lsreq->rsplen < lsrsp->rsplen) ?
+ lsreq->rsplen : lsrsp->rsplen));
+
+ lsrsp->done(lsrsp);
+
+ if (remoteport) {
+ rport = remoteport->private;
+ spin_lock(&rport->lock);
+ list_add_tail(&rport->ls_list, &tls_req->ls_list);
+ spin_unlock(&rport->lock);
+ queue_work(nvmet_wq, &rport->ls_work);
+ }
+
+ return 0;
+}
+
+static void
+fcloop_tport_lsrqst_work(struct work_struct *work)
+{
+ struct fcloop_tport *tport =
+ container_of(work, struct fcloop_tport, ls_work);
+ struct fcloop_lsreq *tls_req;
+
+ spin_lock(&tport->lock);
+ for (;;) {
+ tls_req = list_first_entry_or_null(&tport->ls_list,
+ struct fcloop_lsreq, ls_list);
+ if (!tls_req)
+ break;
+
+ list_del(&tls_req->ls_list);
+ spin_unlock(&tport->lock);
+
+ tls_req->lsreq->done(tls_req->lsreq, tls_req->status);
+ /*
+ * callee may free memory containing tls_req.
+ * do not reference lsreq after this.
+ */
+
+ spin_lock(&tport->lock);
+ }
+ spin_unlock(&tport->lock);
+}
+
+static int
+fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
+ struct nvmefc_ls_req *lsreq)
+{
+ struct fcloop_lsreq *tls_req = lsreq->private;
+ struct fcloop_tport *tport = targetport->private;
+ int ret = 0;
+
+ /*
+ * hosthandle should be the dst.rport value.
+ * hosthandle ignored as fcloop currently is
+ * 1:1 tgtport vs remoteport
+ */
+ tls_req->lsreq = lsreq;
+ INIT_LIST_HEAD(&tls_req->ls_list);
+
+ if (!tport->remoteport) {
+ tls_req->status = -ECONNREFUSED;
+ spin_lock(&tport->lock);
+ list_add_tail(&tport->ls_list, &tls_req->ls_list);
+ spin_unlock(&tport->lock);
+ queue_work(nvmet_wq, &tport->ls_work);
+ return ret;
+ }
+
+ tls_req->status = 0;
+ ret = nvme_fc_rcv_ls_req(tport->remoteport, &tls_req->ls_rsp,
+ lsreq->rqstaddr, lsreq->rqstlen);
+
+ return ret;
+}
+
+static int
+fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ struct nvmefc_ls_rsp *lsrsp)
+{
+ struct fcloop_lsreq *tls_req = ls_rsp_to_lsreq(lsrsp);
+ struct nvmefc_ls_req *lsreq = tls_req->lsreq;
+ struct fcloop_rport *rport = remoteport->private;
+ struct nvmet_fc_target_port *targetport = rport->targetport;
+ struct fcloop_tport *tport;
+
+ memcpy(lsreq->rspaddr, lsrsp->rspbuf,
+ ((lsreq->rsplen < lsrsp->rsplen) ?
+ lsreq->rsplen : lsrsp->rsplen));
+ lsrsp->done(lsrsp);
+
+ if (targetport) {
+ tport = targetport->private;
+ spin_lock(&tport->lock);
+ list_add_tail(&tport->ls_list, &tls_req->ls_list);
+ spin_unlock(&tport->lock);
+ queue_work(nvmet_wq, &tport->ls_work);
+ }
+
+ return 0;
+}
+
+static void
+fcloop_t2h_host_release(void *hosthandle)
+{
+ /* host handle ignored for now */
+}
+
+/*
+ * Simulate reception of RSCN and converting it to a initiator transport
+ * call to rescan a remote port.
+ */
+static void
+fcloop_tgt_rscn_work(struct work_struct *work)
+{
+ struct fcloop_rscn *tgt_rscn =
+ container_of(work, struct fcloop_rscn, work);
+ struct fcloop_tport *tport = tgt_rscn->tport;
+
+ if (tport->remoteport)
+ nvme_fc_rescan_remoteport(tport->remoteport);
+ kfree(tgt_rscn);
+}
+
+static void
+fcloop_tgt_discovery_evt(struct nvmet_fc_target_port *tgtport)
+{
+ struct fcloop_rscn *tgt_rscn;
+
+ tgt_rscn = kzalloc(sizeof(*tgt_rscn), GFP_KERNEL);
+ if (!tgt_rscn)
+ return;
+
+ tgt_rscn->tport = tgtport->private;
+ INIT_WORK(&tgt_rscn->work, fcloop_tgt_rscn_work);
+
+ queue_work(nvmet_wq, &tgt_rscn->work);
+}
+
+static void
+fcloop_tfcp_req_free(struct kref *ref)
+{
+ struct fcloop_fcpreq *tfcp_req =
+ container_of(ref, struct fcloop_fcpreq, ref);
+
+ kfree(tfcp_req);
+}
+
+static void
+fcloop_tfcp_req_put(struct fcloop_fcpreq *tfcp_req)
+{
+ kref_put(&tfcp_req->ref, fcloop_tfcp_req_free);
+}
+
+static int
+fcloop_tfcp_req_get(struct fcloop_fcpreq *tfcp_req)
+{
+ return kref_get_unless_zero(&tfcp_req->ref);
+}
+
+static void
+fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq,
+ struct fcloop_fcpreq *tfcp_req, int status)
+{
+ struct fcloop_ini_fcpreq *inireq = NULL;
+
+ if (fcpreq) {
+ inireq = fcpreq->private;
+ spin_lock(&inireq->inilock);
+ inireq->tfcp_req = NULL;
+ spin_unlock(&inireq->inilock);
+
+ fcpreq->status = status;
+ fcpreq->done(fcpreq);
+ }
+
+ /* release original io reference on tgt struct */
+ fcloop_tfcp_req_put(tfcp_req);
+}
+
+static bool drop_fabric_opcode;
+#define DROP_OPCODE_MASK 0x00FF
+/* fabrics opcode will have a bit set above 1st byte */
+static int drop_opcode = -1;
+static int drop_instance;
+static int drop_amount;
+static int drop_current_cnt;
+
+/*
+ * Routine to parse io and determine if the io is to be dropped.
+ * Returns:
+ * 0 if io is not obstructed
+ * 1 if io was dropped
+ */
+static int check_for_drop(struct fcloop_fcpreq *tfcp_req)
+{
+ struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq;
+ struct nvme_fc_cmd_iu *cmdiu = fcpreq->cmdaddr;
+ struct nvme_command *sqe = &cmdiu->sqe;
+
+ if (drop_opcode == -1)
+ return 0;
+
+ pr_info("%s: seq opcd x%02x fctype x%02x: drop F %s op x%02x "
+ "inst %d start %d amt %d\n",
+ __func__, sqe->common.opcode, sqe->fabrics.fctype,
+ drop_fabric_opcode ? "y" : "n",
+ drop_opcode, drop_current_cnt, drop_instance, drop_amount);
+
+ if ((drop_fabric_opcode &&
+ (sqe->common.opcode != nvme_fabrics_command ||
+ sqe->fabrics.fctype != drop_opcode)) ||
+ (!drop_fabric_opcode && sqe->common.opcode != drop_opcode))
+ return 0;
+
+ if (++drop_current_cnt >= drop_instance) {
+ if (drop_current_cnt >= drop_instance + drop_amount)
+ drop_opcode = -1;
+ return 1;
+ }
+
+ return 0;
+}
+
+static void
+fcloop_fcp_recv_work(struct work_struct *work)
+{
+ struct fcloop_fcpreq *tfcp_req =
+ container_of(work, struct fcloop_fcpreq, fcp_rcv_work);
+ struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq;
+ unsigned long flags;
+ int ret = 0;
+ bool aborted = false;
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ switch (tfcp_req->inistate) {
+ case INI_IO_START:
+ tfcp_req->inistate = INI_IO_ACTIVE;
+ break;
+ case INI_IO_ABORTED:
+ aborted = true;
+ break;
+ default:
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+ WARN_ON(1);
+ return;
+ }
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ if (unlikely(aborted))
+ ret = -ECANCELED;
+ else {
+ if (likely(!check_for_drop(tfcp_req)))
+ ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport,
+ &tfcp_req->tgt_fcp_req,
+ fcpreq->cmdaddr, fcpreq->cmdlen);
+ else
+ pr_info("%s: dropped command ********\n", __func__);
+ }
+ if (ret)
+ fcloop_call_host_done(fcpreq, tfcp_req, ret);
+}
+
+static void
+fcloop_fcp_abort_recv_work(struct work_struct *work)
+{
+ struct fcloop_fcpreq *tfcp_req =
+ container_of(work, struct fcloop_fcpreq, abort_rcv_work);
+ struct nvmefc_fcp_req *fcpreq;
+ bool completed = false;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ fcpreq = tfcp_req->fcpreq;
+ switch (tfcp_req->inistate) {
+ case INI_IO_ABORTED:
+ break;
+ case INI_IO_COMPLETED:
+ completed = true;
+ break;
+ default:
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+ WARN_ON(1);
+ return;
+ }
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ if (unlikely(completed)) {
+ /* remove reference taken in original abort downcall */
+ fcloop_tfcp_req_put(tfcp_req);
+ return;
+ }
+
+ if (tfcp_req->tport->targetport)
+ nvmet_fc_rcv_fcp_abort(tfcp_req->tport->targetport,
+ &tfcp_req->tgt_fcp_req);
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ tfcp_req->fcpreq = NULL;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
+ /* call_host_done releases reference for abort downcall */
+}
+
+/*
+ * FCP IO operation done by target completion.
+ * call back up initiator "done" flows.
+ */
+static void
+fcloop_tgt_fcprqst_done_work(struct work_struct *work)
+{
+ struct fcloop_fcpreq *tfcp_req =
+ container_of(work, struct fcloop_fcpreq, tio_done_work);
+ struct nvmefc_fcp_req *fcpreq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ fcpreq = tfcp_req->fcpreq;
+ tfcp_req->inistate = INI_IO_COMPLETED;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ fcloop_call_host_done(fcpreq, tfcp_req, tfcp_req->status);
+}
+
+
+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;
+ struct fcloop_ini_fcpreq *inireq = fcpreq->private;
+ struct fcloop_fcpreq *tfcp_req;
+
+ if (!rport->targetport)
+ return -ECONNREFUSED;
+
+ tfcp_req = kzalloc(sizeof(*tfcp_req), GFP_ATOMIC);
+ if (!tfcp_req)
+ return -ENOMEM;
+
+ inireq->fcpreq = fcpreq;
+ inireq->tfcp_req = tfcp_req;
+ spin_lock_init(&inireq->inilock);
+
+ tfcp_req->fcpreq = fcpreq;
+ tfcp_req->tport = rport->targetport->private;
+ tfcp_req->inistate = INI_IO_START;
+ spin_lock_init(&tfcp_req->reqlock);
+ INIT_WORK(&tfcp_req->fcp_rcv_work, fcloop_fcp_recv_work);
+ INIT_WORK(&tfcp_req->abort_rcv_work, fcloop_fcp_abort_recv_work);
+ INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work);
+ kref_init(&tfcp_req->ref);
+
+ queue_work(nvmet_wq, &tfcp_req->fcp_rcv_work);
+
+ return 0;
+}
+
+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);
+ struct nvmefc_fcp_req *fcpreq;
+ u32 rsplen = 0, xfrlen = 0;
+ int fcp_err = 0, active, aborted;
+ u8 op = tgt_fcpreq->op;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ fcpreq = tfcp_req->fcpreq;
+ active = tfcp_req->active;
+ aborted = tfcp_req->aborted;
+ tfcp_req->active = true;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ if (unlikely(active))
+ /* illegal - call while i/o active */
+ return -EALREADY;
+
+ if (unlikely(aborted)) {
+ /* target transport has aborted i/o prior */
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ tfcp_req->active = false;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+ 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.
+ */
+
+ switch (op) {
+ case NVMET_FCOP_WRITEDATA:
+ xfrlen = tgt_fcpreq->transfer_length;
+ if (fcpreq) {
+ fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
+ fcpreq->first_sgl, tgt_fcpreq->offset,
+ xfrlen);
+ fcpreq->transferred_length += xfrlen;
+ }
+ break;
+
+ case NVMET_FCOP_READDATA:
+ case NVMET_FCOP_READDATA_RSP:
+ xfrlen = tgt_fcpreq->transfer_length;
+ if (fcpreq) {
+ fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
+ fcpreq->first_sgl, tgt_fcpreq->offset,
+ xfrlen);
+ fcpreq->transferred_length += xfrlen;
+ }
+ if (op == NVMET_FCOP_READDATA)
+ break;
+
+ /* Fall-Thru to RSP handling */
+ fallthrough;
+
+ case NVMET_FCOP_RSP:
+ 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;
+ }
+ tfcp_req->status = 0;
+ break;
+
+ default:
+ fcp_err = -EINVAL;
+ break;
+ }
+
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ tfcp_req->active = false;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ tgt_fcpreq->transferred_length = xfrlen;
+ tgt_fcpreq->fcp_error = fcp_err;
+ tgt_fcpreq->done(tgt_fcpreq);
+
+ return 0;
+}
+
+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);
+ unsigned long flags;
+
+ /*
+ * 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_irqsave(&tfcp_req->reqlock, flags);
+ tfcp_req->aborted = true;
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ tfcp_req->status = NVME_SC_INTERNAL;
+
+ /*
+ * 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.
+ */
+}
+
+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);
+
+ queue_work(nvmet_wq, &tfcp_req->tio_done_work);
+}
+
+static void
+fcloop_h2t_ls_abort(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ struct nvmefc_ls_req *lsreq)
+{
+}
+
+static void
+fcloop_t2h_ls_abort(struct nvmet_fc_target_port *targetport,
+ void *hosthandle, 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)
+{
+ struct fcloop_ini_fcpreq *inireq = fcpreq->private;
+ struct fcloop_fcpreq *tfcp_req;
+ bool abortio = true;
+ unsigned long flags;
+
+ spin_lock(&inireq->inilock);
+ tfcp_req = inireq->tfcp_req;
+ if (tfcp_req)
+ fcloop_tfcp_req_get(tfcp_req);
+ spin_unlock(&inireq->inilock);
+
+ if (!tfcp_req)
+ /* abort has already been called */
+ return;
+
+ /* break initiator/target relationship for io */
+ spin_lock_irqsave(&tfcp_req->reqlock, flags);
+ switch (tfcp_req->inistate) {
+ case INI_IO_START:
+ case INI_IO_ACTIVE:
+ tfcp_req->inistate = INI_IO_ABORTED;
+ break;
+ case INI_IO_COMPLETED:
+ abortio = false;
+ break;
+ default:
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+ WARN_ON(1);
+ return;
+ }
+ spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+
+ if (abortio)
+ /* leave the reference while the work item is scheduled */
+ WARN_ON(!queue_work(nvmet_wq, &tfcp_req->abort_rcv_work));
+ else {
+ /*
+ * as the io has already had the done callback made,
+ * nothing more to do. So release the reference taken above
+ */
+ fcloop_tfcp_req_put(tfcp_req);
+ }
+}
+
+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 void
+fcloop_localport_delete(struct nvme_fc_local_port *localport)
+{
+ struct fcloop_lport_priv *lport_priv = localport->private;
+ struct fcloop_lport *lport = lport_priv->lport;
+
+ /* 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;
+
+ flush_work(&rport->ls_work);
+ fcloop_nport_put(rport->nport);
+}
+
+static void
+fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
+{
+ struct fcloop_tport *tport = targetport->private;
+
+ flush_work(&tport->ls_work);
+ fcloop_nport_put(tport->nport);
+}
+
+#define FCLOOP_HW_QUEUES 4
+#define FCLOOP_SGL_SEGS 256
+#define FCLOOP_DMABOUND_4G 0xFFFFFFFF
+
+static struct nvme_fc_port_template fctemplate = {
+ .localport_delete = fcloop_localport_delete,
+ .remoteport_delete = fcloop_remoteport_delete,
+ .create_queue = fcloop_create_queue,
+ .delete_queue = fcloop_delete_queue,
+ .ls_req = fcloop_h2t_ls_req,
+ .fcp_io = fcloop_fcp_req,
+ .ls_abort = fcloop_h2t_ls_abort,
+ .fcp_abort = fcloop_fcp_abort,
+ .xmt_ls_rsp = fcloop_t2h_xmt_ls_rsp,
+ .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_priv),
+ .remote_priv_sz = sizeof(struct fcloop_rport),
+ .lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
+ .fcprqst_priv_sz = sizeof(struct fcloop_ini_fcpreq),
+};
+
+static struct nvmet_fc_target_template tgttemplate = {
+ .targetport_delete = fcloop_targetport_delete,
+ .xmt_ls_rsp = fcloop_h2t_xmt_ls_rsp,
+ .fcp_op = fcloop_fcp_op,
+ .fcp_abort = fcloop_tgt_fcp_abort,
+ .fcp_req_release = fcloop_fcp_req_release,
+ .discovery_event = fcloop_tgt_discovery_evt,
+ .ls_req = fcloop_t2h_ls_req,
+ .ls_abort = fcloop_t2h_ls_abort,
+ .host_release = fcloop_t2h_host_release,
+ .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 */
+ .target_features = 0,
+ /* sizes of additional private data for data structures */
+ .target_priv_sz = sizeof(struct fcloop_tport),
+ .lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
+};
+
+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;
+ struct fcloop_lport_priv *lport_priv;
+ unsigned long flags;
+ int ret = -ENOMEM;
+
+ lport = kzalloc(sizeof(*lport), GFP_KERNEL);
+ if (!lport)
+ return -ENOMEM;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ goto out_free_lport;
+
+ 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;
+ }
+
+ memset(&pinfo, 0, sizeof(pinfo));
+ 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) {
+ /* success */
+ lport_priv = localport->private;
+ lport_priv->lport = lport;
+
+ 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);
+ }
+
+out_free_opts:
+ kfree(opts);
+out_free_lport:
+ /* free only if we're going to fail */
+ if (ret)
+ kfree(lport);
+
+ 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);
+
+ if (!ret)
+ wait_for_completion(&lport->unreg_done);
+
+ kfree(lport);
+
+ 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 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;
+
+ memset(&pinfo, 0, sizeof(pinfo));
+ 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;
+ spin_lock_init(&rport->lock);
+ INIT_WORK(&rport->ls_work, fcloop_rport_lsrqst_work);
+ INIT_LIST_HEAD(&rport->ls_list);
+
+ return count;
+}
+
+
+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
+__remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
+{
+ if (!rport)
+ return -EALREADY;
+
+ return nvme_fc_unregister_remoteport(rport->remoteport);
+}
+
+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 = __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;
+ spin_lock_init(&tport->lock);
+ INIT_WORK(&tport->ls_work, fcloop_tport_lsrqst_work);
+ INIT_LIST_HEAD(&tport->ls_list);
+
+ return count;
+}
+
+
+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
+__targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
+{
+ if (!tport)
+ return -EALREADY;
+
+ return nvmet_fc_unregister_targetport(tport->targetport);
+}
+
+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 = 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(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 = __targetport_unreg(nport, tport);
+
+ return ret ? ret : count;
+}
+
+static ssize_t
+fcloop_set_cmd_drop(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int opcode;
+ int starting, amount;
+
+ if (sscanf(buf, "%x:%d:%d", &opcode, &starting, &amount) != 3)
+ return -EBADRQC;
+
+ drop_current_cnt = 0;
+ drop_fabric_opcode = (opcode & ~DROP_OPCODE_MASK) ? true : false;
+ drop_opcode = (opcode & DROP_OPCODE_MASK);
+ drop_instance = starting;
+ /* the check to drop routine uses instance + count to know when
+ * to end. Thus, if dropping 1 instance, count should be 0.
+ * so subtract 1 from the count.
+ */
+ drop_amount = amount - 1;
+
+ pr_info("%s: DROP: Starting at instance %d of%s opcode x%x drop +%d "
+ "instances\n",
+ __func__, drop_instance, drop_fabric_opcode ? " fabric" : "",
+ drop_opcode, drop_amount);
+
+ return 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 DEVICE_ATTR(set_cmd_drop, 0200, NULL, fcloop_set_cmd_drop);
+
+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,
+ &dev_attr_set_cmd_drop.attr,
+ NULL
+};
+
+static const 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("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 = NULL;
+ struct fcloop_nport *nport = NULL;
+ 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 = __targetport_unreg(nport, tport);
+ if (ret)
+ pr_warn("%s: Failed deleting target port\n", __func__);
+
+ ret = __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");