Add nvme-fabrics target FC transport support
Implements the FC-NVME T11 definition of how nvme fabric capsules are
performed on an FC fabric. Utilizes a lower-layer API to FC host adapters
to send/receive FC-4 LS operations and perform the FCP transactions necessary
to perform and FCP IO request for NVME.
The T11 definitions for FC-4 Link Services are implemented which create
NVMeOF connections. Implements the hooks with nvmet layer to pass NVME
commands to it for processing and posting of data/response base to the
host via the differernt connections.
Signed-off-by: James Smart <james.sm...@broadcom.com>
---
drivers/nvme/target/Kconfig | 10 +
drivers/nvme/target/Makefile | 2 +
drivers/nvme/target/fc.c | 1881 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1893 insertions(+)
create mode 100644 drivers/nvme/target/fc.c
diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig
index a5c31cb..62819b2 100644
--- a/drivers/nvme/target/Kconfig
+++ b/drivers/nvme/target/Kconfig
@@ -34,3 +34,13 @@ config NVME_TARGET_RDMA
devices over RDMA.
If unsure, say N.
+
+config NVME_TARGET_FC
+ tristate "NVMe over Fabrics FC target driver"
+ select NVME_TARGET
+ help
+ This enables the NVMe FC target support, which allows exporting NVMe
+ devices over FC.
+
+ If unsure, say N.
+
diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index b7a0623..80b128b 100644
--- a/drivers/nvme/target/Makefile
+++ b/drivers/nvme/target/Makefile
@@ -2,8 +2,10 @@
obj-$(CONFIG_NVME_TARGET) += nvmet.o
obj-$(CONFIG_NVME_TARGET_LOOP) += nvme-loop.o
obj-$(CONFIG_NVME_TARGET_RDMA) += nvmet-rdma.o
+obj-$(CONFIG_NVME_TARGET_FC) += nvmet-fc.o
nvmet-y += core.o configfs.o admin-cmd.o io-cmd.o fabrics-cmd.o
\
discovery.o
nvme-loop-y += loop.o
nvmet-rdma-y += rdma.o
+nvmet-fc-y += fc.o
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
new file mode 100644
index 0000000..3a5a522
--- /dev/null
+++ b/drivers/nvme/target/fc.c
@@ -0,0 +1,1881 @@
+/*
+ * 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 "nvmet.h"
+#include <linux/nvme-fc-driver.h>
+#include <linux/nvme-fc.h>
+
+
+/* *************************** Data Structures/Defines ****************** */
+
+
+#define NVMET_LS_CTX_COUNT 4
+
+/* 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 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));
+
+#define NVMET_FC_MAX_KB_PER_XFR 256
+
+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 *data_sg;
+ struct scatterlist *next_sg;
+ int data_sg_cnt;
+ u32 next_sg_offset;
+ u32 total_length;
+ u32 offset;
+ enum nvmet_fcp_datadir io_dir;
+ bool aborted;
+
+ struct nvmet_req req;
+ struct work_struct 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; /* nvme_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;
+ u32 assoc_cnt;
+ struct nvmet_port *port;
+
+ struct kref ref;
+};
+
+struct nvmet_fc_tgt_queue {
+ bool connected;
+ bool ninetypercent;
+ u16 qid;
+ u16 sqsize;
+ u16 ersp_ratio;
+ u16 sqhd;
+ atomic_t sqtail;
+ atomic_t zrspcnt;
+ atomic_t rsn;
+ 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 workqueue_struct *work_q;
+} __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];
+};
+
+
+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);
+}
+
+
+#define NVMET_FC_QUEUEID_MASK ((u64)(NVMET_NR_QUEUES-1))
+ /* stuff qid into lower bits */
+
+static inline u64
+nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid)
+{
+ return (u64)(((u64)(assoc) & ~NVMET_FC_QUEUEID_MASK) | qid);
+}
+
+static inline u64
+nvmet_fc_getassociationid(u64 connectionid)
+{
+ return (u64)((connectionid) & ~NVMET_FC_QUEUEID_MASK);
+}
+
+static inline u16
+nvmet_fc_getqueueid(u64 connectionid)
+{
+ return (u16)((connectionid) & NVMET_FC_QUEUEID_MASK);
+}
+
+
+/* *************************** Globals **************************** */
+
+
+static DEFINE_SPINLOCK(nvme_fc_tgtlock);
+
+static LIST_HEAD(nvmet_fc_target_list);
+static u32 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);
+
+
+/* *********************** 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;
+
+ /* TODO: better to use dma_map_page() ?*/
+ iod->rspdma = dma_map_single(tgtport->dev, iod->rspbuf,
+ NVME_FC_MAX_LS_BUFFER_SIZE,
+ DMA_TO_DEVICE);
+ if (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--) {
+ 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++) {
+ 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)
+{
+ static 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);
+ fod->tgtport = tgtport;
+ fod->queue = queue;
+ list_add_tail(&fod->fcp_list, &queue->fod_list);
+
+ /* TODO: better to use dma_map_page() ?*/
+ fod->rspdma = dma_map_single(
+ tgtport->dev, &fod->rspiubuf,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ if (dma_mapping_error(tgtport->dev, fod->rspdma)) {
+ list_del(&fod->fcp_list);
+ for (fod--, i--; i >= 0; fod--, i--) {
+ 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)
+ 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_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue)
+{
+ static struct nvmet_fc_fcp_iod *fod;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ fod = list_first_entry_or_null(&queue->fod_list,
+ struct nvmet_fc_fcp_iod, fcp_list);
+ if (fod)
+ list_del(&fod->fcp_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return fod;
+}
+
+
+static void
+nvmet_fc_free_fcp_iod(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+}
+
+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;
+
+ 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) {
+ kfree(queue);
+ return NULL;
+ }
+
+ queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1];
+ queue->qid = qid;
+ queue->sqsize = sqsize;
+ queue->assoc = assoc;
+ queue->connected = false;
+ queue->port = assoc->tgtport->port;
+ INIT_LIST_HEAD(&queue->fod_list);
+ atomic_set(&queue->sqtail, 0);
+ atomic_set(&queue->rsn, 1);
+ atomic_set(&queue->zrspcnt, 0);
+
+ nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue);
+
+ ret = nvmet_sq_init(&queue->nvme_sq);
+ if (ret) {
+ nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue);
+ destroy_workqueue(queue->work_q);
+ kfree(queue);
+ return NULL;
+ }
+
+ BUG_ON(assoc->queues[qid]);
+ spin_lock_irqsave(&assoc->tgtport->lock, flags);
+ assoc->queues[qid] = queue;
+ spin_unlock_irqrestore(&assoc->tgtport->lock, flags);
+
+ return queue;
+}
+
+static void
+nvmet_fc_free_target_queue(struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport;
+ unsigned long flags;
+
+ /*
+ * beware: nvmet layer hangs waiting for a completion if
+ * connect command failed
+ */
+ flush_workqueue(queue->work_q);
+ if (queue->connected)
+ nvmet_sq_destroy(&queue->nvme_sq);
+ spin_lock_irqsave(&tgtport->lock, flags);
+ queue->assoc->queues[queue->qid] = NULL;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ nvmet_fc_destroy_fcp_iodlist(tgtport, queue);
+ destroy_workqueue(queue->work_q);
+ kfree(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;
+ u64 association_id = nvmet_fc_getassociationid(connection_id);
+ u16 qid = nvmet_fc_getqueueid(connection_id);
+ 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) {
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return assoc->queues[qid];
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return NULL;
+}
+
+static struct nvmet_fc_tgt_assoc *
+nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc;
+ unsigned long flags;
+
+ assoc = kzalloc(sizeof(*assoc), GFP_KERNEL);
+ if (!assoc)
+ return NULL;
+
+ assoc->tgtport = tgtport;
+ assoc->association_id = cpu_to_le64(nvmet_fc_makeconnid(assoc, 0));
+ INIT_LIST_HEAD(&assoc->a_list);
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ assoc->a_id = tgtport->assoc_cnt++;
+ list_add_tail(&assoc->a_list, &tgtport->assoc_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ return assoc;
+}
+
+static void
+nvmet_fc_free_target_assoc(struct nvmet_fc_tgt_assoc *assoc)
+{
+ 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);
+ kfree(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;
+ 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
+ * @tgtport_p: 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 0.
+ *
+ * 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;
+
+ if (!template->xmt_ls_rsp || !template->fcp_op ||
+ !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;
+ }
+
+ 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.fabric_name = pinfo->fabric_name;
+ 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);
+
+ ret = nvmet_fc_alloc_ls_iodlist(newrec);
+ if (ret) {
+ ret = -ENOMEM;
+ goto out_free_newrec;
+ }
+
+ spin_lock_irqsave(&nvme_fc_tgtlock, flags);
+ newrec->fc_target_port.port_num = nvmet_fc_tgtport_cnt++;
+ list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list);
+ spin_unlock_irqrestore(&nvme_fc_tgtlock, flags);
+
+ *portptr = &newrec->fc_target_port;
+ return 0;
+
+out_free_newrec:
+ kfree(newrec);
+out_regtgt_failed:
+ *portptr = NULL;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport);
+
+
+/**
+ * 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 =
+ container_of(target_port, struct nvmet_fc_tgtport,
+ fc_target_port);
+ unsigned long flags;
+ u32 pnum;
+
+ pnum = tgtport->fc_target_port.port_num;
+
+ spin_lock_irqsave(&nvme_fc_tgtlock, flags);
+ list_del(&tgtport->tgt_list);
+ spin_unlock_irqrestore(&nvme_fc_tgtlock, flags);
+
+ nvmet_fc_free_ls_iodlist(tgtport);
+ kfree(tgtport);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport);
+
+
+static void
+__nvmet_fc_free_queues(struct nvmet_fc_tgt_assoc *assoc)
+{
+ struct nvmet_fc_tgt_queue *queue;
+ int i;
+
+ for (i = 0; i < NVMET_NR_QUEUES; i++) {
+ queue = assoc->queues[i];
+ if (queue) {
+ assoc->queues[i] = NULL;
+ kfree(queue);
+ }
+ }
+}
+
+static void
+__nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc, *next;
+
+ list_for_each_entry_safe(assoc, next,
+ &tgtport->assoc_list, a_list) {
+ list_del(&assoc->a_list);
+ __nvmet_fc_free_queues(assoc);
+ kfree(assoc);
+ }
+}
+
+static void
+__nvmet_fc_free_tgtports(void)
+{
+ struct nvmet_fc_tgtport *tgtport, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&nvme_fc_tgtlock, flags);
+ list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list,
+ tgt_list) {
+ list_del(&tgtport->tgt_list);
+ __nvmet_fc_free_assocs(tgtport);
+ kfree(tgtport);
+ }
+ spin_unlock_irqrestore(&nvme_fc_tgtlock, flags);
+}
+
+
+
+/* *********************** FC-NVME LS Handling **************************** */
+
+
+static void
+nvmet_fc_format_rsp_hdr(void *buf, u8 ls_cmd, u32 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(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;
+
+ BUG_ON(buflen < sizeof(struct fcnvme_ls_rjt));
+ nvmet_fc_format_rsp_hdr(buf, FCNVME_LSDESC_RQST,
+ FCNVME_LSDESC_LEN(struct fcnvme_ls_rjt),
+ ls_cmd);
+ rjt->rjt.desc_tag = cpu_to_be32(FCNVME_LSDESC_RJT);
+ rjt->rjt.desc_len = FCNVME_LSDESC_LEN(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_NO_ASSOC = 7,
+ VERR_QUEUE_ALLOC_FAIL = 8,
+ VERR_CR_CONN_LEN = 9,
+ VERR_CR_CONN_RQST_LEN = 10,
+ VERR_ASSOC_ID = 11,
+ VERR_ASSOC_ID_LEN = 12,
+ VERR_CR_CONN_CMD = 13,
+ VERR_CR_CONN_CMD_LEN = 14,
+ VERR_DISCONN_LEN = 15,
+ VERR_DISCONN_RQST_LEN = 16,
+ VERR_DISCONN_CMD = 17,
+ VERR_DISCONN_CMD_LEN = 18,
+ VERR_DISCONN_SCOPE = 19,
+};
+
+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",
+ "No Association",
+ "Queue Allocation Failed",
+ "Bad CR_CONN Length",
+ "Bad CR_CONN Rqst Length",
+ "Not Association ID",
+ "Bad Association ID Length",
+ "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",
+};
+
+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));
+
+ if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_assoc_rqst))
+ ret = VERR_CR_ASSOC_LEN;
+ else if (rqst->desc_list_len !=
+ FCNVME_LSDESC_LEN(struct fcnvme_ls_cr_assoc_rqst))
+ 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 (rqst->assoc_cmd.desc_len !=
+ FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_cr_assoc_cmd))
+ 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;
+ nvmet_fc_free_target_assoc(iod->assoc);
+ }
+ }
+ }
+
+ 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,
+ LSRJT_REASON_LOGICAL_ERROR,
+ LSRJT_EXPL_NO_EXPLANATION, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio);
+ queue->connected = true;
+ queue->sqhd = 0; /* TODO: 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(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(
+ 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(
+ 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(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(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(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;
+ }
+ }
+
+ 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 == 10) ? LSRJT_REASON_PROTOCOL_ERROR :
+ LSRJT_REASON_LOGICAL_ERROR,
+ LSRJT_EXPL_NO_EXPLANATION, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio);
+ queue->connected = true;
+ queue->sqhd = 0; /* TODO: 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(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(
+ 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;
+ struct nvmet_fc_tgt_assoc *assoc;
+ int ret = 0, i;
+ bool del_assoc = true;
+
+ 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(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(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(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)
+ 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 == 8) ? LSRJT_REASON_PROTOCOL_ERROR :
+ LSRJT_REASON_LOGICAL_ERROR,
+ LSRJT_EXPL_NO_EXPLANATION, 0);
+ return;
+ }
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ FCNVME_LSDESC_LEN(struct fcnvme_ls_disconnect_acc),
+ FCNVME_LS_DISCONNECT);
+
+
+ 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_free_target_queue(queue);
+
+ /* see if there are any more queues */
+ for (i = 0; i < NVMET_NR_QUEUES; i++)
+ if (assoc->queues[i])
+ break;
+
+ /*
+ * if tearing down admin queue or no more queues,
+ * fall thru to tear down the association.
+ */
+ if ((queue->qid) && (i != NVMET_NR_QUEUES))
+ del_assoc = false;
+ }
+ }
+
+ if (del_assoc) {
+ for (i = NVMET_NR_QUEUES - 1; i >= 0; i--)
+ if (assoc->queues[i])
+ nvmet_fc_free_target_queue(
+ assoc->queues[i]);
+ /*
+ * Don't send ABTS's - let host side do that
+ */
+ nvmet_fc_free_target_assoc(assoc);
+ }
+}
+
+
+
+/* *********************** NVME Ctrl Routines **************************** */
+
+
+static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req);
+
+static 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;
+
+ 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);
+}
+
+static void
+nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ int ret;
+
+ 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
+ */
+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, set up nvmet req (cmd, rsp, execute)
+ * and format the LS response
+ * if non-zero returned, then no futher action taken on the LS
+ * if zero:
+ * valid to call nvmet layer if execute routine set
+ * iod->rspbuf contains 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,
+ LSRJT_REASON_INVALID_ELS_CODE,
+ LSRJT_EXPL_NO_EXPLANATION, 0);
+ }
+
+ nvmet_fc_xmt_ls_rsp(tgtport, iod);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+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 receive 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 = container_of(target_port,
+ struct nvmet_fc_tgtport, fc_target_port);
+ struct nvmet_fc_ls_iod *iod;
+
+ if (lsreqbuf_len > NVME_FC_MAX_LS_BUFFER_SIZE)
+ return -E2BIG;
+
+ iod = nvmet_fc_alloc_ls_iod(tgtport);
+ if (!iod)
+ return -ENOENT;
+
+ iod->lsreq = lsreq;
+ 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;
+ struct page *page;
+ unsigned int nent;
+ u32 page_len, length;
+ int i = 0;
+
+ length = fod->total_length;
+ nent = DIV_ROUND_UP(length, PAGE_SIZE);
+ sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!sg)
+ return NVME_SC_INTERNAL;
+
+ /* TODO: convert to using sg pagelist */
+ sg_init_table(sg, nent);
+
+ while (length) {
+ page_len = min_t(u32, length, PAGE_SIZE);
+
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ goto out_free_pages;
+
+ sg_set_page(&sg[i], page, page_len, 0);
+ length -= page_len;
+ i++;
+ }
+
+ fod->data_sg = sg;
+ fod->data_sg_cnt = nent;
+ fod->data_sg_cnt = 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 */
+
+ if ((fod->data_sg_cnt) &&
+ (fod->data_sg_cnt < fod->tgtport->ops->max_sgl_segments))
+ return 0;
+
+ if (fod->data_sg_cnt)
+ 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));
+
+out_free_pages:
+ while (i > 0) {
+ i--;
+ __free_page(sg_page(&sg[i]));
+ }
+ kfree(sg);
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+ return NVME_SC_INTERNAL;
+}
+
+static void
+nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
+{
+ struct scatterlist *sg;
+ int count;
+
+ if (!fod->data_sg || !fod->data_sg_cnt)
+ return;
+
+ 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));
+ for_each_sg(fod->data_sg, sg, fod->data_sg_cnt, count)
+ __free_page(sg_page(sg));
+ kfree(fod->data_sg);
+}
+
+static void
+nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ int ret;
+
+ fcpreq->op = NVMET_FCOP_ABORT;
+ fcpreq->offset = 0;
+ fcpreq->timeout = 0;
+ fcpreq->transfer_length = 0;
+ fcpreq->transferred_length = 0;
+ fcpreq->fcp_error = 0;
+ fcpreq->sg_cnt = 0;
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fcpreq);
+ if (ret) {
+ BUG_ON(1);
+ /* should never reach here !! */
+ }
+}
+
+
+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;
+
+ /*
+ * 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
+ */
+ rspcnt = atomic_inc_return(&fod->queue->zrspcnt);
+ if (!(rspcnt % fod->queue->ersp_ratio) ||
+ (sqe->opcode == nvme_fabrics_command) ||
+ (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, 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);
+ fod->fcpreq->rsplen = sizeof(*ersp);
+ }
+
+ 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_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ int ret;
+
+ fod->fcpreq->op = NVMET_FCOP_RSP;
+ fod->fcpreq->offset = 0;
+ fod->fcpreq->timeout = 0;
+
+ nvmet_fc_prep_fcp_rsp(tgtport, fod);
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq);
+ if (ret) {
+ fod->aborted = true;
+ nvmet_fc_abort_op(tgtport, fod->fcpreq);
+ }
+}
+
+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, *datasg;
+ u32 tlen, sg_off;
+ int ret;
+
+ fcpreq->op = op;
+ fcpreq->offset = fod->offset;
+ fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC;
+ tlen = min_t(u32, (NVMET_FC_MAX_KB_PER_XFR * 1024),
+ (fod->total_length - fod->offset));
+ tlen = min_t(u32, tlen, (NVME_FC_MAX_SEGMENTS * PAGE_SIZE));
+ fcpreq->transfer_length = tlen;
+ fcpreq->transferred_length = 0;
+ fcpreq->fcp_error = 0;
+ fcpreq->rsplen = 0;
+
+ fcpreq->sg_cnt = 0;
+
+ datasg = fod->next_sg;
+ sg_off = fod->next_sg_offset;
+
+ for (sg = fcpreq->sg ; tlen; sg++) {
+ *sg = *datasg;
+ if (sg_off) {
+ sg->offset += sg_off;
+ sg->length -= sg_off;
+ sg->dma_address += sg_off;
+ sg_off = 0;
+ }
+ if (tlen < sg->length) {
+ sg->length = tlen;
+ fod->next_sg = datasg;
+ fod->next_sg_offset += tlen;
+ } else if (tlen == sg->length) {
+ fod->next_sg_offset = 0;
+ fod->next_sg = sg_next(datasg);
+ } else {
+ fod->next_sg_offset = 0;
+ datasg = sg_next(datasg);
+ }
+ tlen -= sg->length;
+ fcpreq->sg_cnt++;
+ }
+
+ /*
+ * If the last READDATA request: check if LLDD supports
+ * combined xfr with response.
+ */
+ if ((op == NVMET_FCOP_READDATA) &&
+ ((fod->offset + fcpreq->transfer_length) == fod->total_length) &&
+ (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) {
+ if (op == NVMET_FCOP_WRITEDATA)
+ nvmet_req_complete(&fod->req, ret);
+ else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ {
+ fcpreq->fcp_error = ret;
+ fcpreq->transferred_length = 0;
+ fod->aborted = true;
+ nvmet_fc_xmt_fcp_op_done(fod->fcpreq);
+ }
+ }
+}
+
+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_tgtport *tgtport = fod->tgtport;
+ struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf;
+ struct nvme_completion *cqe = &ersp->cqe;
+
+ switch (fcpreq->op) {
+
+ case NVMET_FCOP_WRITEDATA:
+ if (fcpreq->fcp_error) {
+ nvmet_req_complete(&fod->req, fcpreq->fcp_error);
+ return;
+ }
+ if (fcpreq->transferred_length != fcpreq->transfer_length) {
+ nvmet_req_complete(&fod->req,
+ NVME_SC_FC_TRANSPORT_ERROR);
+ return;
+ }
+
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->total_length) {
+ /* transfer the next chunk */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_WRITEDATA);
+ return;
+ }
+
+ /* data transfer complete, resume with nvmet layer */
+
+ fod->req.execute(&fod->req);
+
+ break;
+
+ case NVMET_FCOP_READDATA:
+ if (fcpreq->fcp_error)
+ /* overwrite the nvmet status */
+ cqe->status = cpu_to_le16(fcpreq->fcp_error);
+
+ else if (fcpreq->transferred_length !=
+ fcpreq->transfer_length)
+ /* overwrite the nvmet status */
+ cqe->status = cpu_to_le16(NVME_SC_FC_TRANSPORT_ERROR);
+
+ else {
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->total_length) {
+ /* 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);
+
+ if (unlikely(fod->aborted))
+ nvmet_fc_abort_op(tgtport, fod->fcpreq);
+ else
+ nvmet_fc_xmt_fcp_rsp(tgtport, fod);
+
+ break;
+
+ case NVMET_FCOP_READDATA_RSP:
+ if (fcpreq->fcp_error)
+ /* overwrite the nvmet status */
+ cqe->status = cpu_to_le16(fcpreq->fcp_error);
+
+ else if (fcpreq->transferred_length !=
+ fcpreq->transfer_length)
+ /* overwrite the nvmet status */
+ cqe->status = cpu_to_le16(NVME_SC_FC_TRANSPORT_ERROR);
+
+ else
+ fod->offset += fcpreq->transferred_length;
+
+ /* data transfer complete, response complete as well */
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ dma_sync_single_for_cpu(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ nvmet_fc_free_fcp_iod(tgtport, fod);
+ break;
+
+ case NVMET_FCOP_RSP:
+ case NVMET_FCOP_ABORT:
+ dma_sync_single_for_cpu(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ nvmet_fc_free_fcp_iod(tgtport, fod);
+ break;
+
+ default:
+ fod->aborted = true;
+ nvmet_fc_abort_op(tgtport, fod->fcpreq);
+ break;
+ }
+}
+
+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;
+
+ /* 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 {
+ /* snoop the last sq_head value from the last response */
+ fod->queue->sqhd = cqe->sq_head;
+
+ /*
+ * 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 =
+ container_of(nvme_req, struct nvmet_fc_fcp_iod, 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
+ */
+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;
+ int ret;
+
+ /*
+ * TODO: handle fused cmds back-to-back
+ */
+
+ fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done;
+
+ fod->total_length = be32_to_cpu(cmdiu->data_len);
+ 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 (fod->total_length)
+ goto transport_error;
+ }
+ fod->aborted = false;
+
+ fod->req.cmd = &fod->cmdiubuf.sqe;
+ fod->req.rsp = &fod->rspiubuf.cqe;
+ fod->req.port = fod->queue->port;
+
+ /* ensure nvmet handlers will set cmd handler callback */
+ fod->req.execute = NULL;
+
+ /* clear any response payload */
+ memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf));
+
+ ret = nvmet_req_init(&fod->req,
+ &fod->queue->nvme_cq,
+ &fod->queue->nvme_sq,
+ &nvmet_fc_tgt_fcp_ops);
+ if (!ret) { /* bad SQE content */
+ __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod,
+ NVME_SC_FC_TRANSPORT_ERROR);
+ return;
+ }
+
+ /* keep a running counter of tail position */
+ atomic_inc(&fod->queue->sqtail);
+
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+ if (fod->total_length) {
+ 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;
+ fod->next_sg = fod->data_sg;
+ fod->next_sg_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
+ */
+
+ fod->req.execute(&fod->req);
+
+ return;
+
+transport_error:
+ __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, NVME_SC_FC_TRANSPORT_ERROR);
+}
+
+/*
+ * 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 will copy cmd payload to an internal structure for
+ * processing. As such, upon completion of the routine, the LLDD may
+ * immediately free/reuse the CMD IU buffer passed in the call.
+ *
+ * If this routine returns error, the lldd should abort the exchange.
+ *
+ * @tgtport: pointer to the (registered) target port the FCP CMD IU
+ * was receive 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 = container_of(target_port,
+ struct nvmet_fc_tgtport, fc_target_port);
+ struct nvme_fc_cmd_iu *cmdiu = cmdiubuf;
+ struct nvmet_fc_tgt_queue *queue;
+ struct nvmet_fc_fcp_iod *fod;
+
+
+ /* 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;
+
+ fod = nvmet_fc_alloc_fcp_iod(tgtport, queue);
+ if (!fod)
+ return -ENOENT;
+
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+ memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len);
+
+ queue_work(fod->queue->work_q, &fod->work);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req);
+
+enum {
+ FCT_TRADDR_ERR = 0,
+ FCT_TRADDR_FABRIC = 1 << 0,
+ FCT_TRADDR_WWNN = 1 << 1,
+ FCT_TRADDR_WWPN = 1 << 2,
+};
+
+struct nvmet_fc_traddr {
+ u64 fab;
+ u64 nn;
+ u64 pn;
+};
+
+static const match_table_t traddr_opt_tokens = {
+ { FCT_TRADDR_FABRIC, "fab-%s" },
+ { FCT_TRADDR_WWNN, "nn-%s" },
+ { FCT_TRADDR_WWPN, "pn-%s" },
+ { FCT_TRADDR_ERR, NULL }
+};
+
+static int
+nvmet_fc_parse_traddr(struct nvmet_fc_traddr *traddr, 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, traddr_opt_tokens, args);
+ switch (token) {
+ case FCT_TRADDR_FABRIC:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ traddr->fab = token64;
+ break;
+ case FCT_TRADDR_WWNN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ traddr->nn = token64;
+ break;
+ case FCT_TRADDR_WWPN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ traddr->pn = token64;
+ break;
+ default:
+ pr_warn("unknown traddr token or missing value '%s'\n",
+ p);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+out:
+ kfree(options);
+ return ret;
+}
+
+static int
+nvmet_fc_add_port(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_traddr traddr = { 0L, 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 = nvmet_fc_parse_traddr(&traddr, port->disc_addr.traddr);
+ if (ret)
+ return ret;
+
+ ret = -ENXIO;
+ spin_lock_irqsave(&nvme_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->fc_target_port.fabric_name == traddr.fab)) {
+ /* a FC port can only be 1 nvmet port id */
+ if (tgtport->port)
+ ret = -EALREADY;
+ else {
+ tgtport->port = port;
+ port->priv = tgtport;
+ ret = 0;
+ }
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&nvme_fc_tgtlock, flags);
+ return ret;
+}
+
+static void
+nvmet_fc_remove_port(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport = port->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&nvme_fc_tgtlock, flags);
+ if (tgtport->port == port)
+ tgtport->port = NULL;
+ spin_unlock_irqrestore(&nvme_fc_tgtlock, flags);
+}
+
+static 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,
+};
+
+static int __init nvmet_fc_init_module(void)
+{
+ /* ensure NVMET_NR_QUEUES is a power of 2 - required for our masks */
+ if (!is_power_of_2((unsigned long)NVMET_NR_QUEUES)) {
+ pr_err("%s: NVMET_NR_QUEUES required to be power of 2\n",
+ __func__);
+ return(-EINVAL);
+ }
+
+ return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops);
+}
+
+static void __exit nvmet_fc_exit_module(void)
+{
+ nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops);
+
+ __nvmet_fc_free_tgtports();
+}
+
+module_init(nvmet_fc_init_module);
+module_exit(nvmet_fc_exit_module);
+
+MODULE_LICENSE("GPL v2");
+
+
+
--
2.5.0
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