v4.19.13 snapshot.
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
new file mode 100644
index 0000000..29b4b23
--- /dev/null
+++ b/drivers/nvme/target/fc.c
@@ -0,0 +1,2576 @@
+/*
+ * 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/slab.h>
+#include <linux/blk-mq.h>
+#include <linux/parser.h>
+#include <linux/random.h>
+#include <uapi/scsi/fc/fc_fs.h>
+#include <uapi/scsi/fc/fc_els.h>
+
+#include "nvmet.h"
+#include <linux/nvme-fc-driver.h>
+#include <linux/nvme-fc.h>
+
+
+/* *************************** Data Structures/Defines ****************** */
+
+
+#define NVMET_LS_CTX_COUNT 256
+
+/* for this implementation, assume small single frame rqst/rsp */
+#define NVME_FC_MAX_LS_BUFFER_SIZE 2048
+
+struct nvmet_fc_tgtport;
+struct nvmet_fc_tgt_assoc;
+
+struct nvmet_fc_ls_iod {
+ struct nvmefc_tgt_ls_req *lsreq;
+ struct nvmefc_tgt_fcp_req *fcpreq; /* only if RS */
+
+ struct list_head ls_list; /* tgtport->ls_list */
+
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_tgt_assoc *assoc;
+
+ u8 *rqstbuf;
+ u8 *rspbuf;
+ u16 rqstdatalen;
+ dma_addr_t rspdma;
+
+ struct scatterlist sg[2];
+
+ struct work_struct work;
+} __aligned(sizeof(unsigned long long));
+
+/* desired maximum for a single sequence - if sg list allows it */
+#define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024)
+
+enum nvmet_fcp_datadir {
+ NVMET_FCP_NODATA,
+ NVMET_FCP_WRITE,
+ NVMET_FCP_READ,
+ NVMET_FCP_ABORTED,
+};
+
+struct nvmet_fc_fcp_iod {
+ struct nvmefc_tgt_fcp_req *fcpreq;
+
+ struct nvme_fc_cmd_iu cmdiubuf;
+ struct nvme_fc_ersp_iu rspiubuf;
+ dma_addr_t rspdma;
+ struct scatterlist *next_sg;
+ struct scatterlist *data_sg;
+ int data_sg_cnt;
+ u32 offset;
+ enum nvmet_fcp_datadir io_dir;
+ bool active;
+ bool abort;
+ bool aborted;
+ bool writedataactive;
+ spinlock_t flock;
+
+ struct nvmet_req req;
+ struct work_struct work;
+ struct work_struct done_work;
+ struct work_struct defer_work;
+
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_tgt_queue *queue;
+
+ struct list_head fcp_list; /* tgtport->fcp_list */
+};
+
+struct nvmet_fc_tgtport {
+
+ struct nvmet_fc_target_port fc_target_port;
+
+ struct list_head tgt_list; /* nvmet_fc_target_list */
+ struct device *dev; /* dev for dma mapping */
+ struct nvmet_fc_target_template *ops;
+
+ struct nvmet_fc_ls_iod *iod;
+ spinlock_t lock;
+ struct list_head ls_list;
+ struct list_head ls_busylist;
+ struct list_head assoc_list;
+ struct ida assoc_cnt;
+ struct nvmet_port *port;
+ struct kref ref;
+ u32 max_sg_cnt;
+};
+
+struct nvmet_fc_defer_fcp_req {
+ struct list_head req_list;
+ struct nvmefc_tgt_fcp_req *fcp_req;
+};
+
+struct nvmet_fc_tgt_queue {
+ bool ninetypercent;
+ u16 qid;
+ u16 sqsize;
+ u16 ersp_ratio;
+ __le16 sqhd;
+ int cpu;
+ atomic_t connected;
+ atomic_t sqtail;
+ atomic_t zrspcnt;
+ atomic_t rsn;
+ spinlock_t qlock;
+ struct nvmet_port *port;
+ struct nvmet_cq nvme_cq;
+ struct nvmet_sq nvme_sq;
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */
+ struct list_head fod_list;
+ struct list_head pending_cmd_list;
+ struct list_head avail_defer_list;
+ struct workqueue_struct *work_q;
+ struct kref ref;
+} __aligned(sizeof(unsigned long long));
+
+struct nvmet_fc_tgt_assoc {
+ u64 association_id;
+ u32 a_id;
+ struct nvmet_fc_tgtport *tgtport;
+ struct list_head a_list;
+ struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1];
+ struct kref ref;
+ struct work_struct del_work;
+};
+
+
+static inline int
+nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr)
+{
+ return (iodptr - iodptr->tgtport->iod);
+}
+
+static inline int
+nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr)
+{
+ return (fodptr - fodptr->queue->fod);
+}
+
+
+/*
+ * Association and Connection IDs:
+ *
+ * Association ID will have random number in upper 6 bytes and zero
+ * in lower 2 bytes
+ *
+ * Connection IDs will be Association ID with QID or'd in lower 2 bytes
+ *
+ * note: Association ID = Connection ID for queue 0
+ */
+#define BYTES_FOR_QID sizeof(u16)
+#define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8)
+#define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1))
+
+static inline u64
+nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid)
+{
+ return (assoc->association_id | qid);
+}
+
+static inline u64
+nvmet_fc_getassociationid(u64 connectionid)
+{
+ return connectionid & ~NVMET_FC_QUEUEID_MASK;
+}
+
+static inline u16
+nvmet_fc_getqueueid(u64 connectionid)
+{
+ return (u16)(connectionid & NVMET_FC_QUEUEID_MASK);
+}
+
+static inline struct nvmet_fc_tgtport *
+targetport_to_tgtport(struct nvmet_fc_target_port *targetport)
+{
+ return container_of(targetport, struct nvmet_fc_tgtport,
+ fc_target_port);
+}
+
+static inline struct nvmet_fc_fcp_iod *
+nvmet_req_to_fod(struct nvmet_req *nvme_req)
+{
+ return container_of(nvme_req, struct nvmet_fc_fcp_iod, req);
+}
+
+
+/* *************************** Globals **************************** */
+
+
+static DEFINE_SPINLOCK(nvmet_fc_tgtlock);
+
+static LIST_HEAD(nvmet_fc_target_list);
+static DEFINE_IDA(nvmet_fc_tgtport_cnt);
+
+
+static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work);
+static void nvmet_fc_handle_fcp_rqst_work(struct work_struct *work);
+static void nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work);
+static void nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work);
+static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc);
+static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc);
+static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue);
+static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue);
+static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport);
+static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport);
+static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod);
+static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc);
+
+
+/* *********************** FC-NVME DMA Handling **************************** */
+
+/*
+ * The fcloop device passes in a NULL device pointer. Real LLD's will
+ * pass in a valid device pointer. If NULL is passed to the dma mapping
+ * routines, depending on the platform, it may or may not succeed, and
+ * may crash.
+ *
+ * As such:
+ * Wrapper all the dma routines and check the dev pointer.
+ *
+ * If simple mappings (return just a dma address, we'll noop them,
+ * returning a dma address of 0.
+ *
+ * On more complex mappings (dma_map_sg), a pseudo routine fills
+ * in the scatter list, setting all dma addresses to 0.
+ */
+
+static inline dma_addr_t
+fc_dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L;
+}
+
+static inline int
+fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return dev ? dma_mapping_error(dev, dma_addr) : 0;
+}
+
+static inline void
+fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_single(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_cpu(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_device(dev, addr, size, dir);
+}
+
+/* pseudo dma_map_sg call */
+static int
+fc_map_sg(struct scatterlist *sg, int nents)
+{
+ struct scatterlist *s;
+ int i;
+
+ WARN_ON(nents == 0 || sg[0].length == 0);
+
+ for_each_sg(sg, s, nents, i) {
+ s->dma_address = 0L;
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+ s->dma_length = s->length;
+#endif
+ }
+ return nents;
+}
+
+static inline int
+fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents);
+}
+
+static inline void
+fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_sg(dev, sg, nents, dir);
+}
+
+
+/* *********************** FC-NVME Port Management ************************ */
+
+
+static int
+nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod;
+ int i;
+
+ iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod),
+ GFP_KERNEL);
+ if (!iod)
+ return -ENOMEM;
+
+ tgtport->iod = iod;
+
+ for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) {
+ INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work);
+ iod->tgtport = tgtport;
+ list_add_tail(&iod->ls_list, &tgtport->ls_list);
+
+ iod->rqstbuf = kcalloc(2, NVME_FC_MAX_LS_BUFFER_SIZE,
+ GFP_KERNEL);
+ if (!iod->rqstbuf)
+ goto out_fail;
+
+ iod->rspbuf = iod->rqstbuf + NVME_FC_MAX_LS_BUFFER_SIZE;
+
+ iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf,
+ NVME_FC_MAX_LS_BUFFER_SIZE,
+ DMA_TO_DEVICE);
+ if (fc_dma_mapping_error(tgtport->dev, iod->rspdma))
+ goto out_fail;
+ }
+
+ return 0;
+
+out_fail:
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ for (iod--, i--; i >= 0; iod--, i--) {
+ fc_dma_unmap_single(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ }
+
+ kfree(iod);
+
+ return -EFAULT;
+}
+
+static void
+nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod = tgtport->iod;
+ int i;
+
+ for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) {
+ fc_dma_unmap_single(tgtport->dev,
+ iod->rspdma, NVME_FC_MAX_LS_BUFFER_SIZE,
+ DMA_TO_DEVICE);
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ }
+ kfree(tgtport->iod);
+}
+
+static struct nvmet_fc_ls_iod *
+nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ iod = list_first_entry_or_null(&tgtport->ls_list,
+ struct nvmet_fc_ls_iod, ls_list);
+ if (iod)
+ list_move_tail(&iod->ls_list, &tgtport->ls_busylist);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return iod;
+}
+
+
+static void
+nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_move(&iod->ls_list, &tgtport->ls_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+}
+
+static void
+nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ int i;
+
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ INIT_WORK(&fod->work, nvmet_fc_handle_fcp_rqst_work);
+ INIT_WORK(&fod->done_work, nvmet_fc_fcp_rqst_op_done_work);
+ INIT_WORK(&fod->defer_work, nvmet_fc_fcp_rqst_op_defer_work);
+ fod->tgtport = tgtport;
+ fod->queue = queue;
+ fod->active = false;
+ fod->abort = false;
+ fod->aborted = false;
+ fod->fcpreq = NULL;
+ list_add_tail(&fod->fcp_list, &queue->fod_list);
+ spin_lock_init(&fod->flock);
+
+ fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) {
+ list_del(&fod->fcp_list);
+ for (fod--, i--; i >= 0; fod--, i--) {
+ fc_dma_unmap_single(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf),
+ DMA_TO_DEVICE);
+ fod->rspdma = 0L;
+ list_del(&fod->fcp_list);
+ }
+
+ return;
+ }
+ }
+}
+
+static void
+nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ int i;
+
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ if (fod->rspdma)
+ fc_dma_unmap_single(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ }
+}
+
+static struct nvmet_fc_fcp_iod *
+nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod;
+
+ lockdep_assert_held(&queue->qlock);
+
+ fod = list_first_entry_or_null(&queue->fod_list,
+ struct nvmet_fc_fcp_iod, fcp_list);
+ if (fod) {
+ list_del(&fod->fcp_list);
+ fod->active = true;
+ /*
+ * no queue reference is taken, as it was taken by the
+ * queue lookup just prior to the allocation. The iod
+ * will "inherit" that reference.
+ */
+ }
+ return fod;
+}
+
+
+static void
+nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+
+ /*
+ * put all admin cmds on hw queue id 0. All io commands go to
+ * the respective hw queue based on a modulo basis
+ */
+ fcpreq->hwqid = queue->qid ?
+ ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0;
+
+ if (tgtport->ops->target_features & NVMET_FCTGTFEAT_CMD_IN_ISR)
+ queue_work_on(queue->cpu, queue->work_q, &fod->work);
+ else
+ nvmet_fc_handle_fcp_rqst(tgtport, fod);
+}
+
+static void
+nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work)
+{
+ struct nvmet_fc_fcp_iod *fod =
+ container_of(work, struct nvmet_fc_fcp_iod, defer_work);
+
+ /* Submit deferred IO for processing */
+ nvmet_fc_queue_fcp_req(fod->tgtport, fod->queue, fod->fcpreq);
+
+}
+
+static void
+nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
+ unsigned long flags;
+
+ fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+
+ fcpreq->nvmet_fc_private = NULL;
+
+ fod->active = false;
+ fod->abort = false;
+ fod->aborted = false;
+ fod->writedataactive = false;
+ fod->fcpreq = NULL;
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq);
+
+ /* release the queue lookup reference on the completed IO */
+ nvmet_fc_tgt_q_put(queue);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp) {
+ list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+ return;
+ }
+
+ /* Re-use the fod for the next pending cmd that was deferred */
+ list_del(&deferfcp->req_list);
+
+ fcpreq = deferfcp->fcp_req;
+
+ /* deferfcp can be reused for another IO at a later date */
+ list_add_tail(&deferfcp->req_list, &queue->avail_defer_list);
+
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ /* Save NVME CMD IO in fod */
+ memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen);
+
+ /* Setup new fcpreq to be processed */
+ fcpreq->rspaddr = NULL;
+ fcpreq->rsplen = 0;
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+ fod->active = true;
+
+ /* inform LLDD IO is now being processed */
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq);
+
+ /*
+ * Leave the queue lookup get reference taken when
+ * fod was originally allocated.
+ */
+
+ queue_work(queue->work_q, &fod->defer_work);
+}
+
+static int
+nvmet_fc_queue_to_cpu(struct nvmet_fc_tgtport *tgtport, int qid)
+{
+ int cpu, idx, cnt;
+
+ if (tgtport->ops->max_hw_queues == 1)
+ return WORK_CPU_UNBOUND;
+
+ /* Simple cpu selection based on qid modulo active cpu count */
+ idx = !qid ? 0 : (qid - 1) % num_active_cpus();
+
+ /* find the n'th active cpu */
+ for (cpu = 0, cnt = 0; ; ) {
+ if (cpu_active(cpu)) {
+ if (cnt == idx)
+ break;
+ cnt++;
+ }
+ cpu = (cpu + 1) % num_possible_cpus();
+ }
+
+ return cpu;
+}
+
+static struct nvmet_fc_tgt_queue *
+nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc,
+ u16 qid, u16 sqsize)
+{
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ int ret;
+
+ if (qid > NVMET_NR_QUEUES)
+ return NULL;
+
+ queue = kzalloc((sizeof(*queue) +
+ (sizeof(struct nvmet_fc_fcp_iod) * sqsize)),
+ GFP_KERNEL);
+ if (!queue)
+ return NULL;
+
+ if (!nvmet_fc_tgt_a_get(assoc))
+ goto out_free_queue;
+
+ queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0,
+ assoc->tgtport->fc_target_port.port_num,
+ assoc->a_id, qid);
+ if (!queue->work_q)
+ goto out_a_put;
+
+ queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1];
+ queue->qid = qid;
+ queue->sqsize = sqsize;
+ queue->assoc = assoc;
+ queue->port = assoc->tgtport->port;
+ queue->cpu = nvmet_fc_queue_to_cpu(assoc->tgtport, qid);
+ INIT_LIST_HEAD(&queue->fod_list);
+ INIT_LIST_HEAD(&queue->avail_defer_list);
+ INIT_LIST_HEAD(&queue->pending_cmd_list);
+ atomic_set(&queue->connected, 0);
+ atomic_set(&queue->sqtail, 0);
+ atomic_set(&queue->rsn, 1);
+ atomic_set(&queue->zrspcnt, 0);
+ spin_lock_init(&queue->qlock);
+ kref_init(&queue->ref);
+
+ nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue);
+
+ ret = nvmet_sq_init(&queue->nvme_sq);
+ if (ret)
+ goto out_fail_iodlist;
+
+ WARN_ON(assoc->queues[qid]);
+ spin_lock_irqsave(&assoc->tgtport->lock, flags);
+ assoc->queues[qid] = queue;
+ spin_unlock_irqrestore(&assoc->tgtport->lock, flags);
+
+ return queue;
+
+out_fail_iodlist:
+ nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue);
+ destroy_workqueue(queue->work_q);
+out_a_put:
+ nvmet_fc_tgt_a_put(assoc);
+out_free_queue:
+ kfree(queue);
+ return NULL;
+}
+
+
+static void
+nvmet_fc_tgt_queue_free(struct kref *ref)
+{
+ struct nvmet_fc_tgt_queue *queue =
+ container_of(ref, struct nvmet_fc_tgt_queue, ref);
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->assoc->tgtport->lock, flags);
+ queue->assoc->queues[queue->qid] = NULL;
+ spin_unlock_irqrestore(&queue->assoc->tgtport->lock, flags);
+
+ nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue);
+
+ nvmet_fc_tgt_a_put(queue->assoc);
+
+ destroy_workqueue(queue->work_q);
+
+ kfree(queue);
+}
+
+static void
+nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue)
+{
+ kref_put(&queue->ref, nvmet_fc_tgt_queue_free);
+}
+
+static int
+nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue)
+{
+ return kref_get_unless_zero(&queue->ref);
+}
+
+
+static void
+nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport;
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr;
+ unsigned long flags;
+ int i, writedataactive;
+ bool disconnect;
+
+ disconnect = atomic_xchg(&queue->connected, 0);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ /* about outstanding io's */
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ if (fod->active) {
+ spin_lock(&fod->flock);
+ fod->abort = true;
+ writedataactive = fod->writedataactive;
+ spin_unlock(&fod->flock);
+ /*
+ * only call lldd abort routine if waiting for
+ * writedata. other outstanding ops should finish
+ * on their own.
+ */
+ if (writedataactive) {
+ spin_lock(&fod->flock);
+ fod->aborted = true;
+ spin_unlock(&fod->flock);
+ tgtport->ops->fcp_abort(
+ &tgtport->fc_target_port, fod->fcpreq);
+ }
+ }
+ }
+
+ /* Cleanup defer'ed IOs in queue */
+ list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list,
+ req_list) {
+ list_del(&deferfcp->req_list);
+ kfree(deferfcp);
+ }
+
+ for (;;) {
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp)
+ break;
+
+ list_del(&deferfcp->req_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_abort(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+
+ kfree(deferfcp);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ flush_workqueue(queue->work_q);
+
+ if (disconnect)
+ nvmet_sq_destroy(&queue->nvme_sq);
+
+ nvmet_fc_tgt_q_put(queue);
+}
+
+static struct nvmet_fc_tgt_queue *
+nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport,
+ u64 connection_id)
+{
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_queue *queue;
+ u64 association_id = nvmet_fc_getassociationid(connection_id);
+ u16 qid = nvmet_fc_getqueueid(connection_id);
+ unsigned long flags;
+
+ if (qid > NVMET_NR_QUEUES)
+ return NULL;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ if (association_id == assoc->association_id) {
+ queue = assoc->queues[qid];
+ if (queue &&
+ (!atomic_read(&queue->connected) ||
+ !nvmet_fc_tgt_q_get(queue)))
+ queue = NULL;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return queue;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return NULL;
+}
+
+static void
+nvmet_fc_delete_assoc(struct work_struct *work)
+{
+ struct nvmet_fc_tgt_assoc *assoc =
+ container_of(work, struct nvmet_fc_tgt_assoc, del_work);
+
+ nvmet_fc_delete_target_assoc(assoc);
+ nvmet_fc_tgt_a_put(assoc);
+}
+
+static struct nvmet_fc_tgt_assoc *
+nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc, *tmpassoc;
+ unsigned long flags;
+ u64 ran;
+ int idx;
+ bool needrandom = true;
+
+ assoc = kzalloc(sizeof(*assoc), GFP_KERNEL);
+ if (!assoc)
+ return NULL;
+
+ idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0)
+ goto out_free_assoc;
+
+ if (!nvmet_fc_tgtport_get(tgtport))
+ goto out_ida_put;
+
+ assoc->tgtport = tgtport;
+ assoc->a_id = idx;
+ INIT_LIST_HEAD(&assoc->a_list);
+ kref_init(&assoc->ref);
+ INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc);
+
+ while (needrandom) {
+ get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID);
+ ran = ran << BYTES_FOR_QID_SHIFT;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ needrandom = false;
+ list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list)
+ if (ran == tmpassoc->association_id) {
+ needrandom = true;
+ break;
+ }
+ if (!needrandom) {
+ assoc->association_id = ran;
+ list_add_tail(&assoc->a_list, &tgtport->assoc_list);
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ }
+
+ return assoc;
+
+out_ida_put:
+ ida_simple_remove(&tgtport->assoc_cnt, idx);
+out_free_assoc:
+ kfree(assoc);
+ return NULL;
+}
+
+static void
+nvmet_fc_target_assoc_free(struct kref *ref)
+{
+ struct nvmet_fc_tgt_assoc *assoc =
+ container_of(ref, struct nvmet_fc_tgt_assoc, ref);
+ struct nvmet_fc_tgtport *tgtport = assoc->tgtport;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_del(&assoc->a_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ ida_simple_remove(&tgtport->assoc_cnt, assoc->a_id);
+ kfree(assoc);
+ nvmet_fc_tgtport_put(tgtport);
+}
+
+static void
+nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc)
+{
+ kref_put(&assoc->ref, nvmet_fc_target_assoc_free);
+}
+
+static int
+nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc)
+{
+ return kref_get_unless_zero(&assoc->ref);
+}
+
+static void
+nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc)
+{
+ struct nvmet_fc_tgtport *tgtport = assoc->tgtport;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ for (i = NVMET_NR_QUEUES; i >= 0; i--) {
+ queue = assoc->queues[i];
+ if (queue) {
+ if (!nvmet_fc_tgt_q_get(queue))
+ continue;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ nvmet_fc_delete_target_queue(queue);
+ nvmet_fc_tgt_q_put(queue);
+ spin_lock_irqsave(&tgtport->lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ nvmet_fc_tgt_a_put(assoc);
+}
+
+static struct nvmet_fc_tgt_assoc *
+nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport,
+ u64 association_id)
+{
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_assoc *ret = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ if (association_id == assoc->association_id) {
+ ret = assoc;
+ nvmet_fc_tgt_a_get(assoc);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ return ret;
+}
+
+
+/**
+ * nvme_fc_register_targetport - transport entry point called by an
+ * LLDD to register the existence of a local
+ * NVME subystem FC port.
+ * @pinfo: pointer to information about the port to be registered
+ * @template: LLDD entrypoints and operational parameters for the port
+ * @dev: physical hardware device node port corresponds to. Will be
+ * used for DMA mappings
+ * @portptr: pointer to a local port pointer. Upon success, the routine
+ * will allocate a nvme_fc_local_port structure and place its
+ * address in the local port pointer. Upon failure, local port
+ * pointer will be set to NULL.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo,
+ struct nvmet_fc_target_template *template,
+ struct device *dev,
+ struct nvmet_fc_target_port **portptr)
+{
+ struct nvmet_fc_tgtport *newrec;
+ unsigned long flags;
+ int ret, idx;
+
+ if (!template->xmt_ls_rsp || !template->fcp_op ||
+ !template->fcp_abort ||
+ !template->fcp_req_release || !template->targetport_delete ||
+ !template->max_hw_queues || !template->max_sgl_segments ||
+ !template->max_dif_sgl_segments || !template->dma_boundary) {
+ ret = -EINVAL;
+ goto out_regtgt_failed;
+ }
+
+ newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz),
+ GFP_KERNEL);
+ if (!newrec) {
+ ret = -ENOMEM;
+ goto out_regtgt_failed;
+ }
+
+ idx = ida_simple_get(&nvmet_fc_tgtport_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0) {
+ ret = -ENOSPC;
+ goto out_fail_kfree;
+ }
+
+ if (!get_device(dev) && dev) {
+ ret = -ENODEV;
+ goto out_ida_put;
+ }
+
+ newrec->fc_target_port.node_name = pinfo->node_name;
+ newrec->fc_target_port.port_name = pinfo->port_name;
+ newrec->fc_target_port.private = &newrec[1];
+ newrec->fc_target_port.port_id = pinfo->port_id;
+ newrec->fc_target_port.port_num = idx;
+ INIT_LIST_HEAD(&newrec->tgt_list);
+ newrec->dev = dev;
+ newrec->ops = template;
+ spin_lock_init(&newrec->lock);
+ INIT_LIST_HEAD(&newrec->ls_list);
+ INIT_LIST_HEAD(&newrec->ls_busylist);
+ INIT_LIST_HEAD(&newrec->assoc_list);
+ kref_init(&newrec->ref);
+ ida_init(&newrec->assoc_cnt);
+ newrec->max_sg_cnt = template->max_sgl_segments;
+
+ ret = nvmet_fc_alloc_ls_iodlist(newrec);
+ if (ret) {
+ ret = -ENOMEM;
+ goto out_free_newrec;
+ }
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list);
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ *portptr = &newrec->fc_target_port;
+ return 0;
+
+out_free_newrec:
+ put_device(dev);
+out_ida_put:
+ ida_simple_remove(&nvmet_fc_tgtport_cnt, idx);
+out_fail_kfree:
+ kfree(newrec);
+out_regtgt_failed:
+ *portptr = NULL;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport);
+
+
+static void
+nvmet_fc_free_tgtport(struct kref *ref)
+{
+ struct nvmet_fc_tgtport *tgtport =
+ container_of(ref, struct nvmet_fc_tgtport, ref);
+ struct device *dev = tgtport->dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_del(&tgtport->tgt_list);
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ nvmet_fc_free_ls_iodlist(tgtport);
+
+ /* let the LLDD know we've finished tearing it down */
+ tgtport->ops->targetport_delete(&tgtport->fc_target_port);
+
+ ida_simple_remove(&nvmet_fc_tgtport_cnt,
+ tgtport->fc_target_port.port_num);
+
+ ida_destroy(&tgtport->assoc_cnt);
+
+ kfree(tgtport);
+
+ put_device(dev);
+}
+
+static void
+nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport)
+{
+ kref_put(&tgtport->ref, nvmet_fc_free_tgtport);
+}
+
+static int
+nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport)
+{
+ return kref_get_unless_zero(&tgtport->ref);
+}
+
+static void
+__nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry_safe(assoc, next,
+ &tgtport->assoc_list, a_list) {
+ if (!nvmet_fc_tgt_a_get(assoc))
+ continue;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ nvmet_fc_delete_target_assoc(assoc);
+ nvmet_fc_tgt_a_put(assoc);
+ spin_lock_irqsave(&tgtport->lock, flags);
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+}
+
+/*
+ * nvmet layer has called to terminate an association
+ */
+static void
+nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
+{
+ struct nvmet_fc_tgtport *tgtport, *next;
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ bool found_ctrl = false;
+
+ /* this is a bit ugly, but don't want to make locks layered */
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list,
+ tgt_list) {
+ if (!nvmet_fc_tgtport_get(tgtport))
+ continue;
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ queue = assoc->queues[0];
+ if (queue && queue->nvme_sq.ctrl == ctrl) {
+ if (nvmet_fc_tgt_a_get(assoc))
+ found_ctrl = true;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ nvmet_fc_tgtport_put(tgtport);
+
+ if (found_ctrl) {
+ schedule_work(&assoc->del_work);
+ return;
+ }
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ }
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+}
+
+/**
+ * nvme_fc_unregister_targetport - transport entry point called by an
+ * LLDD to deregister/remove a previously
+ * registered a local NVME subsystem FC port.
+ * @tgtport: pointer to the (registered) target port that is to be
+ * deregistered.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+
+ /* terminate any outstanding associations */
+ __nvmet_fc_free_assocs(tgtport);
+
+ nvmet_fc_tgtport_put(tgtport);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport);
+
+
+/* *********************** FC-NVME LS Handling **************************** */
+
+
+static void
+nvmet_fc_format_rsp_hdr(void *buf, u8 ls_cmd, __be32 desc_len, u8 rqst_ls_cmd)
+{
+ struct fcnvme_ls_acc_hdr *acc = buf;
+
+ acc->w0.ls_cmd = ls_cmd;
+ acc->desc_list_len = desc_len;
+ acc->rqst.desc_tag = cpu_to_be32(FCNVME_LSDESC_RQST);
+ acc->rqst.desc_len =
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst));
+ acc->rqst.w0.ls_cmd = rqst_ls_cmd;
+}
+
+static int
+nvmet_fc_format_rjt(void *buf, u16 buflen, u8 ls_cmd,
+ u8 reason, u8 explanation, u8 vendor)
+{
+ struct fcnvme_ls_rjt *rjt = buf;
+
+ nvmet_fc_format_rsp_hdr(buf, FCNVME_LSDESC_RQST,
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_rjt)),
+ ls_cmd);
+ rjt->rjt.desc_tag = cpu_to_be32(FCNVME_LSDESC_RJT);
+ rjt->rjt.desc_len = fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rjt));
+ rjt->rjt.reason_code = reason;
+ rjt->rjt.reason_explanation = explanation;
+ rjt->rjt.vendor = vendor;
+
+ return sizeof(struct fcnvme_ls_rjt);
+}
+
+/* Validation Error indexes into the string table below */
+enum {
+ VERR_NO_ERROR = 0,
+ VERR_CR_ASSOC_LEN = 1,
+ VERR_CR_ASSOC_RQST_LEN = 2,
+ VERR_CR_ASSOC_CMD = 3,
+ VERR_CR_ASSOC_CMD_LEN = 4,
+ VERR_ERSP_RATIO = 5,
+ VERR_ASSOC_ALLOC_FAIL = 6,
+ VERR_QUEUE_ALLOC_FAIL = 7,
+ VERR_CR_CONN_LEN = 8,
+ VERR_CR_CONN_RQST_LEN = 9,
+ VERR_ASSOC_ID = 10,
+ VERR_ASSOC_ID_LEN = 11,
+ VERR_NO_ASSOC = 12,
+ VERR_CONN_ID = 13,
+ VERR_CONN_ID_LEN = 14,
+ VERR_NO_CONN = 15,
+ VERR_CR_CONN_CMD = 16,
+ VERR_CR_CONN_CMD_LEN = 17,
+ VERR_DISCONN_LEN = 18,
+ VERR_DISCONN_RQST_LEN = 19,
+ VERR_DISCONN_CMD = 20,
+ VERR_DISCONN_CMD_LEN = 21,
+ VERR_DISCONN_SCOPE = 22,
+ VERR_RS_LEN = 23,
+ VERR_RS_RQST_LEN = 24,
+ VERR_RS_CMD = 25,
+ VERR_RS_CMD_LEN = 26,
+ VERR_RS_RCTL = 27,
+ VERR_RS_RO = 28,
+};
+
+static char *validation_errors[] = {
+ "OK",
+ "Bad CR_ASSOC Length",
+ "Bad CR_ASSOC Rqst Length",
+ "Not CR_ASSOC Cmd",
+ "Bad CR_ASSOC Cmd Length",
+ "Bad Ersp Ratio",
+ "Association Allocation Failed",
+ "Queue Allocation Failed",
+ "Bad CR_CONN Length",
+ "Bad CR_CONN Rqst Length",
+ "Not Association ID",
+ "Bad Association ID Length",
+ "No Association",
+ "Not Connection ID",
+ "Bad Connection ID Length",
+ "No Connection",
+ "Not CR_CONN Cmd",
+ "Bad CR_CONN Cmd Length",
+ "Bad DISCONN Length",
+ "Bad DISCONN Rqst Length",
+ "Not DISCONN Cmd",
+ "Bad DISCONN Cmd Length",
+ "Bad Disconnect Scope",
+ "Bad RS Length",
+ "Bad RS Rqst Length",
+ "Not RS Cmd",
+ "Bad RS Cmd Length",
+ "Bad RS R_CTL",
+ "Bad RS Relative Offset",
+};
+
+static void
+nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_cr_assoc_rqst *rqst =
+ (struct fcnvme_ls_cr_assoc_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_cr_assoc_acc *acc =
+ (struct fcnvme_ls_cr_assoc_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue;
+ int ret = 0;
+
+ memset(acc, 0, sizeof(*acc));
+
+ /*
+ * FC-NVME spec changes. There are initiators sending different
+ * lengths as padding sizes for Create Association Cmd descriptor
+ * was incorrect.
+ * Accept anything of "minimum" length. Assume format per 1.15
+ * spec (with HOSTID reduced to 16 bytes), ignore how long the
+ * trailing pad length is.
+ */
+ if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN)
+ ret = VERR_CR_ASSOC_LEN;
+ else if (be32_to_cpu(rqst->desc_list_len) <
+ FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN)
+ ret = VERR_CR_ASSOC_RQST_LEN;
+ else if (rqst->assoc_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD))
+ ret = VERR_CR_ASSOC_CMD;
+ else if (be32_to_cpu(rqst->assoc_cmd.desc_len) <
+ FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN)
+ ret = VERR_CR_ASSOC_CMD_LEN;
+ else if (!rqst->assoc_cmd.ersp_ratio ||
+ (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >=
+ be16_to_cpu(rqst->assoc_cmd.sqsize)))
+ ret = VERR_ERSP_RATIO;
+
+ else {
+ /* new association w/ admin queue */
+ iod->assoc = nvmet_fc_alloc_target_assoc(tgtport);
+ if (!iod->assoc)
+ ret = VERR_ASSOC_ALLOC_FAIL;
+ else {
+ queue = nvmet_fc_alloc_target_queue(iod->assoc, 0,
+ be16_to_cpu(rqst->assoc_cmd.sqsize));
+ if (!queue)
+ ret = VERR_QUEUE_ALLOC_FAIL;
+ }
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Create Association LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio);
+ atomic_set(&queue->connected, 1);
+ queue->sqhd = 0; /* best place to init value */
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_cr_assoc_acc)),
+ FCNVME_LS_CREATE_ASSOCIATION);
+ acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID);
+ acc->associd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id));
+ acc->associd.association_id =
+ cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0));
+ acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID);
+ acc->connectid.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_conn_id));
+ acc->connectid.connection_id = acc->associd.association_id;
+}
+
+static void
+nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_cr_conn_rqst *rqst =
+ (struct fcnvme_ls_cr_conn_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_cr_conn_acc *acc =
+ (struct fcnvme_ls_cr_conn_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue;
+ int ret = 0;
+
+ memset(acc, 0, sizeof(*acc));
+
+ if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst))
+ ret = VERR_CR_CONN_LEN;
+ else if (rqst->desc_list_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_cr_conn_rqst)))
+ ret = VERR_CR_CONN_RQST_LEN;
+ else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID))
+ ret = VERR_ASSOC_ID;
+ else if (rqst->associd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id)))
+ ret = VERR_ASSOC_ID_LEN;
+ else if (rqst->connect_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD))
+ ret = VERR_CR_CONN_CMD;
+ else if (rqst->connect_cmd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_cr_conn_cmd)))
+ ret = VERR_CR_CONN_CMD_LEN;
+ else if (!rqst->connect_cmd.ersp_ratio ||
+ (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >=
+ be16_to_cpu(rqst->connect_cmd.sqsize)))
+ ret = VERR_ERSP_RATIO;
+
+ else {
+ /* new io queue */
+ iod->assoc = nvmet_fc_find_target_assoc(tgtport,
+ be64_to_cpu(rqst->associd.association_id));
+ if (!iod->assoc)
+ ret = VERR_NO_ASSOC;
+ else {
+ queue = nvmet_fc_alloc_target_queue(iod->assoc,
+ be16_to_cpu(rqst->connect_cmd.qid),
+ be16_to_cpu(rqst->connect_cmd.sqsize));
+ if (!queue)
+ ret = VERR_QUEUE_ALLOC_FAIL;
+
+ /* release get taken in nvmet_fc_find_target_assoc */
+ nvmet_fc_tgt_a_put(iod->assoc);
+ }
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Create Connection LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ (ret == VERR_NO_ASSOC) ?
+ FCNVME_RJT_RC_INV_ASSOC :
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio);
+ atomic_set(&queue->connected, 1);
+ queue->sqhd = 0; /* best place to init value */
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)),
+ FCNVME_LS_CREATE_CONNECTION);
+ acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID);
+ acc->connectid.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_conn_id));
+ acc->connectid.connection_id =
+ cpu_to_be64(nvmet_fc_makeconnid(iod->assoc,
+ be16_to_cpu(rqst->connect_cmd.qid)));
+}
+
+static void
+nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_disconnect_rqst *rqst =
+ (struct fcnvme_ls_disconnect_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_disconnect_acc *acc =
+ (struct fcnvme_ls_disconnect_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue = NULL;
+ struct nvmet_fc_tgt_assoc *assoc;
+ int ret = 0;
+ bool del_assoc = false;
+
+ memset(acc, 0, sizeof(*acc));
+
+ if (iod->rqstdatalen < sizeof(struct fcnvme_ls_disconnect_rqst))
+ ret = VERR_DISCONN_LEN;
+ else if (rqst->desc_list_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_disconnect_rqst)))
+ ret = VERR_DISCONN_RQST_LEN;
+ else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID))
+ ret = VERR_ASSOC_ID;
+ else if (rqst->associd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id)))
+ ret = VERR_ASSOC_ID_LEN;
+ else if (rqst->discon_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_DISCONN_CMD))
+ ret = VERR_DISCONN_CMD;
+ else if (rqst->discon_cmd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_disconn_cmd)))
+ ret = VERR_DISCONN_CMD_LEN;
+ else if ((rqst->discon_cmd.scope != FCNVME_DISCONN_ASSOCIATION) &&
+ (rqst->discon_cmd.scope != FCNVME_DISCONN_CONNECTION))
+ ret = VERR_DISCONN_SCOPE;
+ else {
+ /* match an active association */
+ assoc = nvmet_fc_find_target_assoc(tgtport,
+ be64_to_cpu(rqst->associd.association_id));
+ iod->assoc = assoc;
+ if (assoc) {
+ if (rqst->discon_cmd.scope ==
+ FCNVME_DISCONN_CONNECTION) {
+ queue = nvmet_fc_find_target_queue(tgtport,
+ be64_to_cpu(
+ rqst->discon_cmd.id));
+ if (!queue) {
+ nvmet_fc_tgt_a_put(assoc);
+ ret = VERR_NO_CONN;
+ }
+ }
+ } else
+ ret = VERR_NO_ASSOC;
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Disconnect LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ (ret == VERR_NO_ASSOC) ?
+ FCNVME_RJT_RC_INV_ASSOC :
+ (ret == VERR_NO_CONN) ?
+ FCNVME_RJT_RC_INV_CONN :
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_disconnect_acc)),
+ FCNVME_LS_DISCONNECT);
+
+
+ /* are we to delete a Connection ID (queue) */
+ if (queue) {
+ int qid = queue->qid;
+
+ nvmet_fc_delete_target_queue(queue);
+
+ /* release the get taken by find_target_queue */
+ nvmet_fc_tgt_q_put(queue);
+
+ /* tear association down if io queue terminated */
+ if (!qid)
+ del_assoc = true;
+ }
+
+ /* release get taken in nvmet_fc_find_target_assoc */
+ nvmet_fc_tgt_a_put(iod->assoc);
+
+ if (del_assoc)
+ nvmet_fc_delete_target_assoc(iod->assoc);
+}
+
+
+/* *********************** NVME Ctrl Routines **************************** */
+
+
+static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req);
+
+static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops;
+
+static void
+nvmet_fc_xmt_ls_rsp_done(struct nvmefc_tgt_ls_req *lsreq)
+{
+ struct nvmet_fc_ls_iod *iod = lsreq->nvmet_fc_private;
+ struct nvmet_fc_tgtport *tgtport = iod->tgtport;
+
+ fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+ nvmet_fc_free_ls_iod(tgtport, iod);
+ nvmet_fc_tgtport_put(tgtport);
+}
+
+static void
+nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ int ret;
+
+ fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+
+ ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsreq);
+ if (ret)
+ nvmet_fc_xmt_ls_rsp_done(iod->lsreq);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_rqst_w0 *w0 =
+ (struct fcnvme_ls_rqst_w0 *)iod->rqstbuf;
+
+ iod->lsreq->nvmet_fc_private = iod;
+ iod->lsreq->rspbuf = iod->rspbuf;
+ iod->lsreq->rspdma = iod->rspdma;
+ iod->lsreq->done = nvmet_fc_xmt_ls_rsp_done;
+ /* Be preventative. handlers will later set to valid length */
+ iod->lsreq->rsplen = 0;
+
+ iod->assoc = NULL;
+
+ /*
+ * handlers:
+ * parse request input, execute the request, and format the
+ * LS response
+ */
+ switch (w0->ls_cmd) {
+ case FCNVME_LS_CREATE_ASSOCIATION:
+ /* Creates Association and initial Admin Queue/Connection */
+ nvmet_fc_ls_create_association(tgtport, iod);
+ break;
+ case FCNVME_LS_CREATE_CONNECTION:
+ /* Creates an IO Queue/Connection */
+ nvmet_fc_ls_create_connection(tgtport, iod);
+ break;
+ case FCNVME_LS_DISCONNECT:
+ /* Terminate a Queue/Connection or the Association */
+ nvmet_fc_ls_disconnect(tgtport, iod);
+ break;
+ default:
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(iod->rspbuf,
+ NVME_FC_MAX_LS_BUFFER_SIZE, w0->ls_cmd,
+ FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0);
+ }
+
+ nvmet_fc_xmt_ls_rsp(tgtport, iod);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_ls_rqst_work(struct work_struct *work)
+{
+ struct nvmet_fc_ls_iod *iod =
+ container_of(work, struct nvmet_fc_ls_iod, work);
+ struct nvmet_fc_tgtport *tgtport = iod->tgtport;
+
+ nvmet_fc_handle_ls_rqst(tgtport, iod);
+}
+
+
+/**
+ * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD
+ * upon the reception of a NVME LS request.
+ *
+ * The nvmet-fc layer will copy payload to an internal structure for
+ * processing. As such, upon completion of the routine, the LLDD may
+ * immediately free/reuse the LS request buffer passed in the call.
+ *
+ * If this routine returns error, the LLDD should abort the exchange.
+ *
+ * @tgtport: pointer to the (registered) target port the LS was
+ * received on.
+ * @lsreq: pointer to a lsreq request structure to be used to reference
+ * the exchange corresponding to the LS.
+ * @lsreqbuf: pointer to the buffer containing the LS Request
+ * @lsreqbuf_len: length, in bytes, of the received LS request
+ */
+int
+nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_ls_req *lsreq,
+ void *lsreqbuf, u32 lsreqbuf_len)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+ struct nvmet_fc_ls_iod *iod;
+
+ if (lsreqbuf_len > NVME_FC_MAX_LS_BUFFER_SIZE)
+ return -E2BIG;
+
+ if (!nvmet_fc_tgtport_get(tgtport))
+ return -ESHUTDOWN;
+
+ iod = nvmet_fc_alloc_ls_iod(tgtport);
+ if (!iod) {
+ nvmet_fc_tgtport_put(tgtport);
+ return -ENOENT;
+ }
+
+ iod->lsreq = lsreq;
+ iod->fcpreq = NULL;
+ memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len);
+ iod->rqstdatalen = lsreqbuf_len;
+
+ schedule_work(&iod->work);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req);
+
+
+/*
+ * **********************
+ * Start of FCP handling
+ * **********************
+ */
+
+static int
+nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
+{
+ struct scatterlist *sg;
+ unsigned int nent;
+
+ sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent);
+ if (!sg)
+ goto out;
+
+ fod->data_sg = sg;
+ fod->data_sg_cnt = nent;
+ fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
+ ((fod->io_dir == NVMET_FCP_WRITE) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE));
+ /* note: write from initiator perspective */
+ fod->next_sg = fod->data_sg;
+
+ return 0;
+
+out:
+ return NVME_SC_INTERNAL;
+}
+
+static void
+nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
+{
+ if (!fod->data_sg || !fod->data_sg_cnt)
+ return;
+
+ fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt,
+ ((fod->io_dir == NVMET_FCP_WRITE) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE));
+ sgl_free(fod->data_sg);
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+}
+
+
+static bool
+queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd)
+{
+ u32 sqtail, used;
+
+ /* egad, this is ugly. And sqtail is just a best guess */
+ sqtail = atomic_read(&q->sqtail) % q->sqsize;
+
+ used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd);
+ return ((used * 10) >= (((u32)(q->sqsize - 1) * 9)));
+}
+
+/*
+ * Prep RSP payload.
+ * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op
+ */
+static void
+nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf;
+ struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common;
+ struct nvme_completion *cqe = &ersp->cqe;
+ u32 *cqewd = (u32 *)cqe;
+ bool send_ersp = false;
+ u32 rsn, rspcnt, xfr_length;
+
+ if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP)
+ xfr_length = fod->req.transfer_len;
+ else
+ xfr_length = fod->offset;
+
+ /*
+ * check to see if we can send a 0's rsp.
+ * Note: to send a 0's response, the NVME-FC host transport will
+ * recreate the CQE. The host transport knows: sq id, SQHD (last
+ * seen in an ersp), and command_id. Thus it will create a
+ * zero-filled CQE with those known fields filled in. Transport
+ * must send an ersp for any condition where the cqe won't match
+ * this.
+ *
+ * Here are the FC-NVME mandated cases where we must send an ersp:
+ * every N responses, where N=ersp_ratio
+ * force fabric commands to send ersp's (not in FC-NVME but good
+ * practice)
+ * normal cmds: any time status is non-zero, or status is zero
+ * but words 0 or 1 are non-zero.
+ * the SQ is 90% or more full
+ * the cmd is a fused command
+ * transferred data length not equal to cmd iu length
+ */
+ rspcnt = atomic_inc_return(&fod->queue->zrspcnt);
+ if (!(rspcnt % fod->queue->ersp_ratio) ||
+ sqe->opcode == nvme_fabrics_command ||
+ xfr_length != fod->req.transfer_len ||
+ (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] ||
+ (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) ||
+ queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head)))
+ send_ersp = true;
+
+ /* re-set the fields */
+ fod->fcpreq->rspaddr = ersp;
+ fod->fcpreq->rspdma = fod->rspdma;
+
+ if (!send_ersp) {
+ memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP);
+ fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP;
+ } else {
+ ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32));
+ rsn = atomic_inc_return(&fod->queue->rsn);
+ ersp->rsn = cpu_to_be32(rsn);
+ ersp->xfrd_len = cpu_to_be32(xfr_length);
+ fod->fcpreq->rsplen = sizeof(*ersp);
+ }
+
+ fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+}
+
+static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq);
+
+static void
+nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ /*
+ * if an ABTS was received or we issued the fcp_abort early
+ * don't call abort routine again.
+ */
+ /* no need to take lock - lock was taken earlier to get here */
+ if (!fod->aborted)
+ tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq);
+
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+}
+
+static void
+nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ int ret;
+
+ fod->fcpreq->op = NVMET_FCOP_RSP;
+ fod->fcpreq->timeout = 0;
+
+ nvmet_fc_prep_fcp_rsp(tgtport, fod);
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq);
+ if (ret)
+ nvmet_fc_abort_op(tgtport, fod);
+}
+
+static void
+nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod, u8 op)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct scatterlist *sg = fod->next_sg;
+ unsigned long flags;
+ u32 remaininglen = fod->req.transfer_len - fod->offset;
+ u32 tlen = 0;
+ int ret;
+
+ fcpreq->op = op;
+ fcpreq->offset = fod->offset;
+ fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC;
+
+ /*
+ * for next sequence:
+ * break at a sg element boundary
+ * attempt to keep sequence length capped at
+ * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to
+ * be longer if a single sg element is larger
+ * than that amount. This is done to avoid creating
+ * a new sg list to use for the tgtport api.
+ */
+ fcpreq->sg = sg;
+ fcpreq->sg_cnt = 0;
+ while (tlen < remaininglen &&
+ fcpreq->sg_cnt < tgtport->max_sg_cnt &&
+ tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) {
+ fcpreq->sg_cnt++;
+ tlen += sg_dma_len(sg);
+ sg = sg_next(sg);
+ }
+ if (tlen < remaininglen && fcpreq->sg_cnt == 0) {
+ fcpreq->sg_cnt++;
+ tlen += min_t(u32, sg_dma_len(sg), remaininglen);
+ sg = sg_next(sg);
+ }
+ if (tlen < remaininglen)
+ fod->next_sg = sg;
+ else
+ fod->next_sg = NULL;
+
+ fcpreq->transfer_length = tlen;
+ fcpreq->transferred_length = 0;
+ fcpreq->fcp_error = 0;
+ fcpreq->rsplen = 0;
+
+ /*
+ * If the last READDATA request: check if LLDD supports
+ * combined xfr with response.
+ */
+ if ((op == NVMET_FCOP_READDATA) &&
+ ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) &&
+ (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) {
+ fcpreq->op = NVMET_FCOP_READDATA_RSP;
+ nvmet_fc_prep_fcp_rsp(tgtport, fod);
+ }
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq);
+ if (ret) {
+ /*
+ * should be ok to set w/o lock as its in the thread of
+ * execution (not an async timer routine) and doesn't
+ * contend with any clearing action
+ */
+ fod->abort = true;
+
+ if (op == NVMET_FCOP_WRITEDATA) {
+ spin_lock_irqsave(&fod->flock, flags);
+ fod->writedataactive = false;
+ spin_unlock_irqrestore(&fod->flock, flags);
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ {
+ fcpreq->fcp_error = ret;
+ fcpreq->transferred_length = 0;
+ nvmet_fc_xmt_fcp_op_done(fod->fcpreq);
+ }
+ }
+}
+
+static inline bool
+__nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ /* if in the middle of an io and we need to tear down */
+ if (abort) {
+ if (fcpreq->op == NVMET_FCOP_WRITEDATA) {
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ return true;
+ }
+
+ nvmet_fc_abort_op(tgtport, fod);
+ return true;
+ }
+
+ return false;
+}
+
+/*
+ * actual done handler for FCP operations when completed by the lldd
+ */
+static void
+nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+ unsigned long flags;
+ bool abort;
+
+ spin_lock_irqsave(&fod->flock, flags);
+ abort = fod->abort;
+ fod->writedataactive = false;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ switch (fcpreq->op) {
+
+ case NVMET_FCOP_WRITEDATA:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ if (fcpreq->fcp_error ||
+ fcpreq->transferred_length != fcpreq->transfer_length) {
+ spin_lock(&fod->flock);
+ fod->abort = true;
+ spin_unlock(&fod->flock);
+
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ return;
+ }
+
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->req.transfer_len) {
+ spin_lock_irqsave(&fod->flock, flags);
+ fod->writedataactive = true;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ /* transfer the next chunk */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_WRITEDATA);
+ return;
+ }
+
+ /* data transfer complete, resume with nvmet layer */
+ nvmet_req_execute(&fod->req);
+ break;
+
+ case NVMET_FCOP_READDATA:
+ case NVMET_FCOP_READDATA_RSP:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ if (fcpreq->fcp_error ||
+ fcpreq->transferred_length != fcpreq->transfer_length) {
+ nvmet_fc_abort_op(tgtport, fod);
+ return;
+ }
+
+ /* success */
+
+ if (fcpreq->op == NVMET_FCOP_READDATA_RSP) {
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+ return;
+ }
+
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->req.transfer_len) {
+ /* transfer the next chunk */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_READDATA);
+ return;
+ }
+
+ /* data transfer complete, send response */
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ nvmet_fc_xmt_fcp_rsp(tgtport, fod);
+
+ break;
+
+ case NVMET_FCOP_RSP:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void
+nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work)
+{
+ struct nvmet_fc_fcp_iod *fod =
+ container_of(work, struct nvmet_fc_fcp_iod, done_work);
+
+ nvmet_fc_fod_op_done(fod);
+}
+
+static void
+nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+ struct nvmet_fc_tgt_queue *queue = fod->queue;
+
+ if (fod->tgtport->ops->target_features & NVMET_FCTGTFEAT_OPDONE_IN_ISR)
+ /* context switch so completion is not in ISR context */
+ queue_work_on(queue->cpu, queue->work_q, &fod->done_work);
+ else
+ nvmet_fc_fod_op_done(fod);
+}
+
+/*
+ * actual completion handler after execution by the nvmet layer
+ */
+static void
+__nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod, int status)
+{
+ struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common;
+ struct nvme_completion *cqe = &fod->rspiubuf.cqe;
+ unsigned long flags;
+ bool abort;
+
+ spin_lock_irqsave(&fod->flock, flags);
+ abort = fod->abort;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ /* if we have a CQE, snoop the last sq_head value */
+ if (!status)
+ fod->queue->sqhd = cqe->sq_head;
+
+ if (abort) {
+ nvmet_fc_abort_op(tgtport, fod);
+ return;
+ }
+
+ /* if an error handling the cmd post initial parsing */
+ if (status) {
+ /* fudge up a failed CQE status for our transport error */
+ memset(cqe, 0, sizeof(*cqe));
+ cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */
+ cqe->sq_id = cpu_to_le16(fod->queue->qid);
+ cqe->command_id = sqe->command_id;
+ cqe->status = cpu_to_le16(status);
+ } else {
+
+ /*
+ * try to push the data even if the SQE status is non-zero.
+ * There may be a status where data still was intended to
+ * be moved
+ */
+ if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) {
+ /* push the data over before sending rsp */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_READDATA);
+ return;
+ }
+
+ /* writes & no data - fall thru */
+ }
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ nvmet_fc_xmt_fcp_rsp(tgtport, fod);
+}
+
+
+static void
+nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req)
+{
+ struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req);
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0);
+}
+
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf;
+ u32 xfrlen = be32_to_cpu(cmdiu->data_len);
+ int ret;
+
+ /*
+ * Fused commands are currently not supported in the linux
+ * implementation.
+ *
+ * As such, the implementation of the FC transport does not
+ * look at the fused commands and order delivery to the upper
+ * layer until we have both based on csn.
+ */
+
+ fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done;
+
+ if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) {
+ fod->io_dir = NVMET_FCP_WRITE;
+ if (!nvme_is_write(&cmdiu->sqe))
+ goto transport_error;
+ } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) {
+ fod->io_dir = NVMET_FCP_READ;
+ if (nvme_is_write(&cmdiu->sqe))
+ goto transport_error;
+ } else {
+ fod->io_dir = NVMET_FCP_NODATA;
+ if (xfrlen)
+ goto transport_error;
+ }
+
+ fod->req.cmd = &fod->cmdiubuf.sqe;
+ fod->req.rsp = &fod->rspiubuf.cqe;
+ fod->req.port = fod->queue->port;
+
+ /* clear any response payload */
+ memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf));
+
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+
+ ret = nvmet_req_init(&fod->req,
+ &fod->queue->nvme_cq,
+ &fod->queue->nvme_sq,
+ &nvmet_fc_tgt_fcp_ops);
+ if (!ret) {
+ /* bad SQE content or invalid ctrl state */
+ /* nvmet layer has already called op done to send rsp. */
+ return;
+ }
+
+ fod->req.transfer_len = xfrlen;
+
+ /* keep a running counter of tail position */
+ atomic_inc(&fod->queue->sqtail);
+
+ if (fod->req.transfer_len) {
+ ret = nvmet_fc_alloc_tgt_pgs(fod);
+ if (ret) {
+ nvmet_req_complete(&fod->req, ret);
+ return;
+ }
+ }
+ fod->req.sg = fod->data_sg;
+ fod->req.sg_cnt = fod->data_sg_cnt;
+ fod->offset = 0;
+
+ if (fod->io_dir == NVMET_FCP_WRITE) {
+ /* pull the data over before invoking nvmet layer */
+ nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA);
+ return;
+ }
+
+ /*
+ * Reads or no data:
+ *
+ * can invoke the nvmet_layer now. If read data, cmd completion will
+ * push the data
+ */
+ nvmet_req_execute(&fod->req);
+ return;
+
+transport_error:
+ nvmet_fc_abort_op(tgtport, fod);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_fcp_rqst_work(struct work_struct *work)
+{
+ struct nvmet_fc_fcp_iod *fod =
+ container_of(work, struct nvmet_fc_fcp_iod, work);
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ nvmet_fc_handle_fcp_rqst(tgtport, fod);
+}
+
+/**
+ * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD
+ * upon the reception of a NVME FCP CMD IU.
+ *
+ * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc
+ * layer for processing.
+ *
+ * The nvmet_fc layer allocates a local job structure (struct
+ * nvmet_fc_fcp_iod) from the queue for the io and copies the
+ * CMD IU buffer to the job structure. As such, on a successful
+ * completion (returns 0), the LLDD may immediately free/reuse
+ * the CMD IU buffer passed in the call.
+ *
+ * However, in some circumstances, due to the packetized nature of FC
+ * and the api of the FC LLDD which may issue a hw command to send the
+ * response, but the LLDD may not get the hw completion for that command
+ * and upcall the nvmet_fc layer before a new command may be
+ * asynchronously received - its possible for a command to be received
+ * before the LLDD and nvmet_fc have recycled the job structure. It gives
+ * the appearance of more commands received than fits in the sq.
+ * To alleviate this scenario, a temporary queue is maintained in the
+ * transport for pending LLDD requests waiting for a queue job structure.
+ * In these "overrun" cases, a temporary queue element is allocated
+ * the LLDD request and CMD iu buffer information remembered, and the
+ * routine returns a -EOVERFLOW status. Subsequently, when a queue job
+ * structure is freed, it is immediately reallocated for anything on the
+ * pending request list. The LLDDs defer_rcv() callback is called,
+ * informing the LLDD that it may reuse the CMD IU buffer, and the io
+ * is then started normally with the transport.
+ *
+ * The LLDD, when receiving an -EOVERFLOW completion status, is to treat
+ * the completion as successful but must not reuse the CMD IU buffer
+ * until the LLDD's defer_rcv() callback has been called for the
+ * corresponding struct nvmefc_tgt_fcp_req pointer.
+ *
+ * If there is any other condition in which an error occurs, the
+ * transport will return a non-zero status indicating the error.
+ * In all cases other than -EOVERFLOW, the transport has not accepted the
+ * request and the LLDD should abort the exchange.
+ *
+ * @target_port: pointer to the (registered) target port the FCP CMD IU
+ * was received on.
+ * @fcpreq: pointer to a fcpreq request structure to be used to reference
+ * the exchange corresponding to the FCP Exchange.
+ * @cmdiubuf: pointer to the buffer containing the FCP CMD IU
+ * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU
+ */
+int
+nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_fcp_req *fcpreq,
+ void *cmdiubuf, u32 cmdiubuf_len)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+ struct nvme_fc_cmd_iu *cmdiu = cmdiubuf;
+ struct nvmet_fc_tgt_queue *queue;
+ struct nvmet_fc_fcp_iod *fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
+ unsigned long flags;
+
+ /* validate iu, so the connection id can be used to find the queue */
+ if ((cmdiubuf_len != sizeof(*cmdiu)) ||
+ (cmdiu->scsi_id != NVME_CMD_SCSI_ID) ||
+ (cmdiu->fc_id != NVME_CMD_FC_ID) ||
+ (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4)))
+ return -EIO;
+
+ queue = nvmet_fc_find_target_queue(tgtport,
+ be64_to_cpu(cmdiu->connection_id));
+ if (!queue)
+ return -ENOTCONN;
+
+ /*
+ * note: reference taken by find_target_queue
+ * After successful fod allocation, the fod will inherit the
+ * ownership of that reference and will remove the reference
+ * when the fod is freed.
+ */
+
+ spin_lock_irqsave(&queue->qlock, flags);
+
+ fod = nvmet_fc_alloc_fcp_iod(queue);
+ if (fod) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+
+ memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len);
+
+ nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq);
+
+ return 0;
+ }
+
+ if (!tgtport->ops->defer_rcv) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+ return -ENOENT;
+ }
+
+ deferfcp = list_first_entry_or_null(&queue->avail_defer_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (deferfcp) {
+ /* Just re-use one that was previously allocated */
+ list_del(&deferfcp->req_list);
+ } else {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ /* Now we need to dynamically allocate one */
+ deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL);
+ if (!deferfcp) {
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+ return -ENOMEM;
+ }
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
+
+ /* For now, use rspaddr / rsplen to save payload information */
+ fcpreq->rspaddr = cmdiubuf;
+ fcpreq->rsplen = cmdiubuf_len;
+ deferfcp->fcp_req = fcpreq;
+
+ /* defer processing till a fod becomes available */
+ list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list);
+
+ /* NOTE: the queue lookup reference is still valid */
+
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ return -EOVERFLOW;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req);
+
+/**
+ * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD
+ * upon the reception of an ABTS for a FCP command
+ *
+ * Notify the transport that an ABTS has been received for a FCP command
+ * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The
+ * LLDD believes the command is still being worked on
+ * (template_ops->fcp_req_release() has not been called).
+ *
+ * The transport will wait for any outstanding work (an op to the LLDD,
+ * which the lldd should complete with error due to the ABTS; or the
+ * completion from the nvmet layer of the nvme command), then will
+ * stop processing and call the nvmet_fc_rcv_fcp_req() callback to
+ * return the i/o context to the LLDD. The LLDD may send the BA_ACC
+ * to the ABTS either after return from this function (assuming any
+ * outstanding op work has been terminated) or upon the callback being
+ * called.
+ *
+ * @target_port: pointer to the (registered) target port the FCP CMD IU
+ * was received on.
+ * @fcpreq: pointer to the fcpreq request structure that corresponds
+ * to the exchange that received the ABTS.
+ */
+void
+nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+
+ if (!fod || fod->fcpreq != fcpreq)
+ /* job appears to have already completed, ignore abort */
+ return;
+
+ queue = fod->queue;
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ if (fod->active) {
+ /*
+ * mark as abort. The abort handler, invoked upon completion
+ * of any work, will detect the aborted status and do the
+ * callback.
+ */
+ spin_lock(&fod->flock);
+ fod->abort = true;
+ fod->aborted = true;
+ spin_unlock(&fod->flock);
+ }
+ spin_unlock_irqrestore(&queue->qlock, flags);
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort);
+
+
+struct nvmet_fc_traddr {
+ u64 nn;
+ u64 pn;
+};
+
+static int
+__nvme_fc_parse_u64(substring_t *sstr, u64 *val)
+{
+ u64 token64;
+
+ if (match_u64(sstr, &token64))
+ return -EINVAL;
+ *val = token64;
+
+ return 0;
+}
+
+/*
+ * This routine validates and extracts the WWN's from the TRADDR string.
+ * As kernel parsers need the 0x to determine number base, universally
+ * build string to parse with 0x prefix before parsing name strings.
+ */
+static int
+nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen)
+{
+ char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1];
+ substring_t wwn = { name, &name[sizeof(name)-1] };
+ int nnoffset, pnoffset;
+
+ /* validate it string one of the 2 allowed formats */
+ if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH &&
+ !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET],
+ "pn-0x", NVME_FC_TRADDR_OXNNLEN)) {
+ nnoffset = NVME_FC_TRADDR_OXNNLEN;
+ pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET +
+ NVME_FC_TRADDR_OXNNLEN;
+ } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH &&
+ !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET],
+ "pn-", NVME_FC_TRADDR_NNLEN))) {
+ nnoffset = NVME_FC_TRADDR_NNLEN;
+ pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN;
+ } else
+ goto out_einval;
+
+ name[0] = '0';
+ name[1] = 'x';
+ name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0;
+
+ memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->nn))
+ goto out_einval;
+
+ memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->pn))
+ goto out_einval;
+
+ return 0;
+
+out_einval:
+ pr_warn("%s: bad traddr string\n", __func__);
+ return -EINVAL;
+}
+
+static int
+nvmet_fc_add_port(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_traddr traddr = { 0L, 0L };
+ unsigned long flags;
+ int ret;
+
+ /* validate the address info */
+ if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) ||
+ (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC))
+ return -EINVAL;
+
+ /* map the traddr address info to a target port */
+
+ ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr,
+ sizeof(port->disc_addr.traddr));
+ if (ret)
+ return ret;
+
+ ret = -ENXIO;
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) {
+ if ((tgtport->fc_target_port.node_name == traddr.nn) &&
+ (tgtport->fc_target_port.port_name == traddr.pn)) {
+ tgtport->port = port;
+ ret = 0;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+ return ret;
+}
+
+static void
+nvmet_fc_remove_port(struct nvmet_port *port)
+{
+ /* nothing to do */
+}
+
+static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
+ .owner = THIS_MODULE,
+ .type = NVMF_TRTYPE_FC,
+ .msdbd = 1,
+ .add_port = nvmet_fc_add_port,
+ .remove_port = nvmet_fc_remove_port,
+ .queue_response = nvmet_fc_fcp_nvme_cmd_done,
+ .delete_ctrl = nvmet_fc_delete_ctrl,
+};
+
+static int __init nvmet_fc_init_module(void)
+{
+ return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops);
+}
+
+static void __exit nvmet_fc_exit_module(void)
+{
+ /* sanity check - all lports should be removed */
+ if (!list_empty(&nvmet_fc_target_list))
+ pr_warn("%s: targetport list not empty\n", __func__);
+
+ nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops);
+
+ ida_destroy(&nvmet_fc_tgtport_cnt);
+}
+
+module_init(nvmet_fc_init_module);
+module_exit(nvmet_fc_exit_module);
+
+MODULE_LICENSE("GPL v2");