Add nvme-fabrics host 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 FCP operations that comprise NVME over FC operation.
The T11 definitions for FC-4 Link Services are implemented which create NVMeOF connections. Implements the hooks with blk-mq to then submit admin and io requests to the different connections. Signed-off-by: James Smart <[email protected]> --- drivers/nvme/host/Kconfig | 15 + drivers/nvme/host/Makefile | 3 + drivers/nvme/host/fc.c | 2113 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 2131 insertions(+) create mode 100644 drivers/nvme/host/fc.c diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig index db39d53..acacf85 100644 --- a/drivers/nvme/host/Kconfig +++ b/drivers/nvme/host/Kconfig @@ -43,3 +43,18 @@ config NVME_RDMA from https://github.com/linux-nvme/nvme-cli. If unsure, say N. + +config NVME_FC + tristate "NVM Express over Fabrics FC host driver" + depends on BLK_DEV_NVME + select NVME_FABRICS + select SG_POOL + help + This provides support for the NVMe over Fabrics protocol using + the FC transport. This allows you to use remote block devices + exported using the NVMe protocol set. + + To configure a NVMe over Fabrics controller use the nvme-cli tool + from https://github.com/linux-nvme/nvme-cli. + + If unsure, say N. diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile index 47abcec..f1a7d94 100644 --- a/drivers/nvme/host/Makefile +++ b/drivers/nvme/host/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_NVME_CORE) += nvme-core.o obj-$(CONFIG_BLK_DEV_NVME) += nvme.o obj-$(CONFIG_NVME_FABRICS) += nvme-fabrics.o obj-$(CONFIG_NVME_RDMA) += nvme-rdma.o +obj-$(CONFIG_NVME_FC) += nvme-fc.o nvme-core-y := core.o nvme-core-$(CONFIG_BLK_DEV_NVME_SCSI) += scsi.o @@ -12,3 +13,5 @@ nvme-y += pci.o nvme-fabrics-y += fabrics.o nvme-rdma-y += rdma.o + +nvme-fc-y += fc.o diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c new file mode 100644 index 0000000..8c242f1 --- /dev/null +++ b/drivers/nvme/host/fc.c @@ -0,0 +1,2113 @@ +/* + * Copyright (c) 2016 Avago Technologies. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful. + * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO + * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. + * See the GNU General Public License for more details, a copy of which + * can be found in the file COPYING included with this package + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/module.h> +#include <linux/parser.h> + +#include "nvme.h" +#include "fabrics.h" +#include <linux/nvme-fc-driver.h> +#include <linux/nvme-fc.h> + + +/* *************************** Data Structures/Defines ****************** */ + + +/* + * We handle AEN commands ourselves and don't even let the + * block layer know about them. + */ +#define NVME_FC_NR_AEN_COMMANDS 1 +#define NVME_FC_AQ_BLKMQ_DEPTH \ + (NVMF_AQ_DEPTH - NVME_FC_NR_AEN_COMMANDS) +#define AEN_CMDID_BASE (NVME_FC_AQ_BLKMQ_DEPTH + 1) +#define IS_AEN_COMMAND(command_id) \ + ((command_id) >= AEN_CMDID_BASE) + +enum nvme_fc_queue_flags { + NVME_FC_Q_CONNECTED = (1 << 0), +}; + +#define NVMEFC_QUEUE_DELAY 3 /* ms units */ + +struct nvme_fc_queue { + struct nvme_fc_ctrl *ctrl; + struct device *dev; + struct blk_mq_hw_ctx *hctx; + void *lldd_handle; + int queue_size; + size_t cmnd_capsule_len; + u32 qnum; + u32 rqcnt; + u32 seqno; + u16 sqhd; + + u64 connection_id; + atomic_t csn; + + unsigned long flags; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +struct nvmefc_ls_req_op { + struct nvmefc_ls_req ls_req; + + struct nvme_fc_ctrl *ctrl; + struct nvme_fc_queue *queue; + struct request *rq; + + int ls_error; + struct completion ls_done; + struct list_head lsreq_list; /* remoteport->ls_req_list */ +}; + +enum nvme_fcpop_state { + FCPOP_STATE_UNINIT = 0, + FCPOP_STATE_IDLE = 1, + FCPOP_STATE_ACTIVE = 2, + FCPOP_STATE_ABORTED = 3, +}; + +struct nvme_fc_fcp_op { + struct nvmefc_fcp_req fcp_req; + + struct nvme_fc_ctrl *ctrl; + struct nvme_fc_queue *queue; + struct request *rq; + + atomic_t state; + u32 rqno; + u32 nents; + struct completion abort_done; + + struct nvme_fc_cmd_iu cmd_iu; + struct nvme_fc_ersp_iu rsp_iu; +}; + +struct nvme_fc_lport { + struct nvme_fc_local_port localport; + + u32 endp_cnt; + struct list_head port_list; /* nvme_fc_port_list */ + struct list_head endp_list; + struct device *dev; /* physical device for dma */ + struct nvme_fc_port_template *ops; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +struct nvme_fc_rport { + struct nvme_fc_remote_port remoteport; + + struct list_head endp_list; /* for lport->endp_list */ + struct list_head ls_req_list; + spinlock_t lock; + struct kref ref; +} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ + +struct nvme_fc_ctrl { + spinlock_t lock; + struct nvme_fc_queue *queues; + u32 queue_count; + + struct device *dev; + struct nvme_fc_lport *lport; + struct nvme_fc_rport *rport; + u32 l_id; + u32 r_id; + + u64 association_id; + + u64 cap; + + struct list_head ctrl_list; /* nvme_fc_ctrl_list */ + + struct blk_mq_tag_set admin_tag_set; + struct blk_mq_tag_set tag_set; + + struct work_struct delete_work; + + struct nvme_fc_fcp_op aen_ops[NVME_FC_NR_AEN_COMMANDS]; + + struct nvme_ctrl ctrl; +}; + +static inline struct nvme_fc_ctrl *to_fc_ctrl(struct nvme_ctrl *ctrl) +{ + return container_of(ctrl, struct nvme_fc_ctrl, ctrl); +} + + + +/* *************************** Globals **************************** */ + + +static DEFINE_SPINLOCK(nvme_fc_lock); + +static LIST_HEAD(nvme_fc_lport_list); +static u32 nvme_fc_local_port_cnt; + +static LIST_HEAD(nvme_fc_ctrl_list); +static DEFINE_MUTEX(nvme_fc_ctrl_mutex); + +static struct workqueue_struct *nvme_fc_wq; + + + +/* *********************** FC-NVME Port Management ************************ */ + + +/** + * nvme_fc_register_localport - transport entry point called by an + * LLDD to register the existence of a NVME + * host 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 + * @lport_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 +nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, + struct nvme_fc_port_template *template, + struct device *dev, + struct nvme_fc_local_port **portptr) +{ + struct nvme_fc_lport *newrec; + unsigned long flags; + int ret; + + if (!template->ls_req || !template->fcp_io || + !template->ls_abort || !template->fcp_abort || + !template->max_hw_queues || !template->max_sgl_segments || + !template->max_dif_sgl_segments || !template->dma_boundary) { + ret = -EINVAL; + goto out_reghost_failed; + } + + newrec = kmalloc((sizeof(*newrec) + template->local_priv_sz), + GFP_KERNEL); + if (!newrec) { + ret = -ENOMEM; + goto out_reghost_failed; + } + + INIT_LIST_HEAD(&newrec->port_list); + INIT_LIST_HEAD(&newrec->endp_list); + newrec->ops = template; + newrec->dev = dev; + newrec->endp_cnt = 0; + newrec->localport.private = &newrec[1]; + newrec->localport.fabric_name = pinfo->fabric_name; + newrec->localport.node_name = pinfo->node_name; + newrec->localport.port_name = pinfo->port_name; + newrec->localport.port_role = pinfo->port_role; + newrec->localport.port_id = pinfo->port_id; + newrec->localport.port_state = FC_OBJSTATE_ONLINE; + + spin_lock_irqsave(&nvme_fc_lock, flags); + newrec->localport.port_num = nvme_fc_local_port_cnt++; + list_add_tail(&newrec->port_list, &nvme_fc_lport_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + if (dev) + dma_set_seg_boundary(dev, template->dma_boundary); + + *portptr = &newrec->localport; + return 0; + +out_reghost_failed: + *portptr = NULL; + return ret; +} +EXPORT_SYMBOL_GPL(nvme_fc_register_localport); + +/** + * nvme_fc_unregister_localport - transport entry point called by an + * LLDD to deregister/remove a previously + * registered a NVME host FC port. + * @localport: pointer to the (registered) local port that is to be + * deregistered. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr) +{ + struct nvme_fc_lport *lport = + container_of(portptr, struct nvme_fc_lport, localport); + unsigned long flags; + u32 pnum; + + /* state check need not be here */ + if (!portptr || (portptr->port_state != FC_OBJSTATE_ONLINE)) + return -EINVAL; + + pnum = portptr->port_num; + + if (!list_empty(&lport->endp_list)) + return -EBUSY; + + spin_lock_irqsave(&nvme_fc_lock, flags); + list_del(&lport->port_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + kfree(lport); + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport); + +/** + * nvme_fc_register_remoteport - transport entry point called by an + * LLDD to register the existence of a NVME + * subsystem FC port on its fabric. + * @localport: pointer to the (registered) local port that the remote + * subsystem port is connected to. + * @pinfo: pointer to information about the port to be registered + * @rport_p: pointer to a remote port pointer. Upon success, the routine + * will allocate a nvme_fc_remote_port structure and place its + * address in the remote port pointer. Upon failure, remote port + * pointer will be set to 0. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, + struct nvme_fc_port_info *pinfo, + struct nvme_fc_remote_port **portptr) +{ + struct nvme_fc_lport *lport = + container_of(localport, struct nvme_fc_lport, localport); + struct nvme_fc_rport *newrec; + unsigned long flags; + int ret; + + newrec = kmalloc((sizeof(*newrec) + lport->ops->remote_priv_sz), + GFP_KERNEL); + if (!newrec) { + ret = -ENOMEM; + goto out_reghost_failed; + } + + INIT_LIST_HEAD(&newrec->endp_list); + INIT_LIST_HEAD(&newrec->ls_req_list); + kref_init(&newrec->ref); + spin_lock_init(&newrec->lock); + newrec->remoteport.localport = &lport->localport; + newrec->remoteport.private = &newrec[1]; + newrec->remoteport.port_role = pinfo->port_role; + newrec->remoteport.node_name = pinfo->node_name; + newrec->remoteport.port_name = pinfo->port_name; + newrec->remoteport.port_id = pinfo->port_id; + newrec->remoteport.port_state = FC_OBJSTATE_ONLINE; + + spin_lock_irqsave(&nvme_fc_lock, flags); + newrec->remoteport.port_num = lport->endp_cnt++; + list_add_tail(&newrec->endp_list, &lport->endp_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + *portptr = &newrec->remoteport; + return 0; + +out_reghost_failed: + *portptr = NULL; + return ret; + +} +EXPORT_SYMBOL_GPL(nvme_fc_register_remoteport); + +/** + * nvme_fc_unregister_remoteport - transport entry point called by an + * LLDD to deregister/remove a previously + * registered a NVME subsystem FC port. + * @remoteport: pointer to the (registered) remote port that is to be + * deregistered. + * + * Returns: + * a completion status. Must be 0 upon success; a negative errno + * (ex: -ENXIO) upon failure. + */ +int +nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr) +{ + struct nvme_fc_rport *rport = + container_of(portptr, struct nvme_fc_rport, remoteport); + struct nvme_fc_lport *lport = + container_of(portptr->localport, + struct nvme_fc_lport, localport); + unsigned long flags; + u32 lnum, pnum; + + /* state check need not be here */ + if (!portptr || (portptr->port_state != FC_OBJSTATE_ONLINE)) + return -EINVAL; + + lnum = lport->localport.port_num; + pnum = portptr->port_num; + + if (!list_empty(&rport->ls_req_list)) + return -EBUSY; + + spin_lock_irqsave(&nvme_fc_lock, flags); + list_del(&rport->endp_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + kfree(rport); + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport); + + +static void +__nvme_fc_free_ports(void) +{ + struct nvme_fc_lport *lport; + struct nvme_fc_rport *rport; + unsigned long flags; + + spin_lock_irqsave(&nvme_fc_lock, flags); + list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { + list_for_each_entry(rport, &lport->endp_list, endp_list) { + list_del(&rport->endp_list); + kfree(rport); + } + + list_del(&lport->port_list); + kfree(lport); + } + spin_unlock_irqrestore(&nvme_fc_lock, flags); +} + + + + +/* *********************** FC-NVME LS Handling **************************** */ + + +static void +nvme_fc_send_ls_req_done(struct nvmefc_ls_req *lsreq, int status) +{ + struct nvmefc_ls_req_op *lsop = + container_of(lsreq, struct nvmefc_ls_req_op, ls_req); + + lsop->ls_error = status; + complete(&lsop->ls_done); +} + + +static int +nvme_fc_send_ls_req(struct nvme_fc_ctrl *ctrl, struct nvmefc_ls_req_op *lsop) +{ + struct nvmefc_ls_req *lsreq = &lsop->ls_req; + struct fcnvme_ls_rjt *rjt = lsreq->rspaddr; + unsigned long flags; + int ret; + + lsreq->done = nvme_fc_send_ls_req_done; + lsop->ctrl = ctrl; + INIT_LIST_HEAD(&lsop->lsreq_list); + init_completion(&lsop->ls_done); + + /* TODO: better to use dma_map_page() ?*/ + lsreq->rqstdma = dma_map_single(ctrl->dev, lsreq->rqstaddr, + (lsreq->rqstlen + lsreq->rsplen), + DMA_BIDIRECTIONAL); + if (dma_mapping_error(ctrl->dev, lsreq->rqstdma)) { + dev_err(ctrl->dev, + "els request command failed EFAULT.\n"); + return -EFAULT; + } + lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; + + spin_lock_irqsave(&ctrl->rport->lock, flags); + list_add_tail(&lsop->lsreq_list, &ctrl->rport->ls_req_list); + spin_unlock_irqrestore(&ctrl->rport->lock, flags); + + ret = ctrl->lport->ops->ls_req(&ctrl->lport->localport, + &ctrl->rport->remoteport, lsreq); + if (ret) { + lsop->ls_error = ret; + goto iodone; + } + + /* + * No timeout/not interruptible as we need the struct to exist until + * the lldd calls us back. Thus mandate wait until driver calls back. + * lldd responsible for the timeout action + */ + wait_for_completion(&lsop->ls_done); + +iodone: + spin_lock_irqsave(&ctrl->rport->lock, flags); + list_del(&lsop->lsreq_list); + spin_unlock_irqrestore(&ctrl->rport->lock, flags); + + dma_unmap_single(ctrl->dev, lsreq->rqstdma, + (lsreq->rqstlen + lsreq->rsplen), + DMA_BIDIRECTIONAL); + + if (lsop->ls_error) { + dev_err(ctrl->dev, + "ls request command failed (%d).\n", lsop->ls_error); + return lsop->ls_error; + } + + /* ACC or RJT payload ? */ + if (rjt->w0.ls_cmd == FCNVME_LS_RJT) + return -ENXIO; + + return 0; +} + +/* Validation Error indexes into the string table below */ +enum { + VERR_NO_ERROR = 0, + VERR_LSACC = 1, + VERR_LSDESC_RQST = 2, + VERR_LSDESC_RQST_LEN = 3, + VERR_ASSOC_ID = 4, + VERR_ASSOC_ID_LEN = 5, + VERR_CONN_ID = 6, + VERR_CONN_ID_LEN = 7, + VERR_CR_ASSOC = 8, + VERR_CR_ASSOC_ACC_LEN = 9, + VERR_CR_CONN = 10, + VERR_CR_CONN_ACC_LEN = 11, + VERR_DISCONN = 12, + VERR_DISCONN_ACC_LEN = 13, +}; + +static char *validation_errors[] = { + "OK", + "Not LS_ACC", + "Not LSDESC_RQST", + "Bad LSDESC_RQST Length", + "Not Association ID", + "Bad Association ID Length", + "Not Connection ID", + "Bad Connection ID Length", + "Not CR_ASSOC Rqst", + "Bad CR_ASSOC ACC Length", + "Not CR_CONN Rqst", + "Bad CR_CONN ACC Length", + "Not Disconnect Rqst", + "Bad Disconnect ACC Length", +}; + +static int +nvme_fc_connect_admin_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, u16 qsize, u16 ersp_ratio) +{ + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + struct fcnvme_ls_cr_assoc_rqst *assoc_rqst; + struct fcnvme_ls_cr_assoc_acc *assoc_acc; + int ret, fcret = 0; + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*assoc_rqst) + sizeof(*assoc_acc)), GFP_KERNEL); + if (!lsop) { + ret = -ENOMEM; + goto out_no_memory; + } + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + assoc_acc = (struct fcnvme_ls_cr_assoc_acc *)&assoc_rqst[1]; + + assoc_rqst->w0.ls_cmd = FCNVME_LS_CREATE_ASSOCIATION; + assoc_rqst->desc_list_len = + cpu_to_be32(sizeof(struct fcnvme_lsdesc_cr_assoc_cmd)); + + assoc_rqst->assoc_cmd.desc_tag = + cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD); + assoc_rqst->assoc_cmd.desc_len = + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_cr_assoc_cmd); + + assoc_rqst->assoc_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); + assoc_rqst->assoc_cmd.sqsize = cpu_to_be16(qsize); + /* TODO: + * assoc_rqst->assoc_cmd.cntlid = cpu_to_be16(?); + * strncpy(assoc_rqst->assoc_cmd.hostid, ?, + * min(FCNVME_ASSOC_HOSTID_LEN, NVMF_NQN_SIZE)); + * strncpy(assoc_rqst->assoc_cmd.hostnqn, ?, + * min(FCNVME_ASSOC_HOSTNQN_LEN, NVMF_NQN_SIZE]; + */ + strncpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn, + min(FCNVME_ASSOC_SUBNQN_LEN, NVMF_NQN_SIZE)); + + + lsop->queue = queue; + lsreq->rqstaddr = assoc_rqst; + lsreq->rqstlen = sizeof(*assoc_rqst); + lsreq->rspaddr = assoc_acc; + lsreq->rsplen = sizeof(*assoc_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req(ctrl, lsop); + if (ret) + goto out_free_buffer; + + /* process connect LS completion */ + + /* validate the ACC response */ + if (assoc_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) + fcret = VERR_LSACC; + if (assoc_acc->hdr.desc_list_len != + FCNVME_LSDESC_LEN(struct fcnvme_ls_cr_assoc_acc)) + fcret = VERR_CR_ASSOC_ACC_LEN; + if (assoc_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) + fcret = VERR_LSDESC_RQST; + else if (assoc_acc->hdr.rqst.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_rqst)) + fcret = VERR_LSDESC_RQST_LEN; + else if (assoc_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_ASSOCIATION) + fcret = VERR_CR_ASSOC; + else if (assoc_acc->associd.desc_tag != + cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) + fcret = VERR_ASSOC_ID; + else if (assoc_acc->associd.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_assoc_id)) + fcret = VERR_ASSOC_ID_LEN; + else if (assoc_acc->connectid.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CONN_ID)) + fcret = VERR_CONN_ID; + else if (assoc_acc->connectid.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_conn_id)) + fcret = VERR_CONN_ID_LEN; + + if (fcret) { + ret = -EBADF; + dev_err(ctrl->dev, + "q %d connect failed: %s\n", + queue->qnum, validation_errors[fcret]); + } else { + ctrl->association_id = + be64_to_cpu(assoc_acc->associd.association_id); + queue->connection_id = + be64_to_cpu(assoc_acc->connectid.connection_id); + set_bit(NVME_FC_Q_CONNECTED, &queue->flags); + } + +out_free_buffer: + kfree(lsop); +out_no_memory: + if (ret) + dev_err(ctrl->dev, + "queue %d connect command failed (%d).\n", + queue->qnum, ret); + return ret; +} + +static int +nvme_fc_connect_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, + u16 qsize, u16 ersp_ratio) +{ + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + struct fcnvme_ls_cr_conn_rqst *conn_rqst; + struct fcnvme_ls_cr_conn_acc *conn_acc; + int ret, fcret = 0; + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*conn_rqst) + sizeof(*conn_acc)), GFP_KERNEL); + if (!lsop) { + ret = -ENOMEM; + goto out_no_memory; + } + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + conn_rqst = (struct fcnvme_ls_cr_conn_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + conn_acc = (struct fcnvme_ls_cr_conn_acc *)&conn_rqst[1]; + + conn_rqst->w0.ls_cmd = FCNVME_LS_CREATE_CONNECTION; + conn_rqst->desc_list_len = cpu_to_be32( + sizeof(struct fcnvme_lsdesc_assoc_id) + + sizeof(struct fcnvme_lsdesc_cr_conn_cmd)); + + conn_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); + conn_rqst->associd.desc_len = + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_assoc_id); + conn_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); + conn_rqst->connect_cmd.desc_tag = + cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD); + conn_rqst->connect_cmd.desc_len = + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_cr_conn_cmd); + conn_rqst->connect_cmd.ersp_ratio = cpu_to_be16(ersp_ratio); + conn_rqst->connect_cmd.qid = cpu_to_be16(queue->qnum); + conn_rqst->connect_cmd.sqsize = cpu_to_be16(qsize); + + lsop->queue = queue; + lsreq->rqstaddr = conn_rqst; + lsreq->rqstlen = sizeof(*conn_rqst); + lsreq->rspaddr = conn_acc; + lsreq->rsplen = sizeof(*conn_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req(ctrl, lsop); + if (ret) + goto out_free_buffer; + + /* process connect LS completion */ + + /* validate the ACC response */ + if (conn_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) + fcret = VERR_LSACC; + if (conn_acc->hdr.desc_list_len != + FCNVME_LSDESC_LEN(struct fcnvme_ls_cr_conn_acc)) + fcret = VERR_CR_CONN_ACC_LEN; + if (conn_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) + fcret = VERR_LSDESC_RQST; + else if (conn_acc->hdr.rqst.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_rqst)) + fcret = VERR_LSDESC_RQST_LEN; + else if (conn_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_CONNECTION) + fcret = VERR_CR_CONN; + else if (conn_acc->connectid.desc_tag != + cpu_to_be32(FCNVME_LSDESC_CONN_ID)) + fcret = VERR_CONN_ID; + else if (conn_acc->connectid.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_conn_id)) + fcret = VERR_CONN_ID_LEN; + + if (fcret) { + ret = -EBADF; + dev_err(ctrl->dev, + "q %d connect failed: %s\n", + queue->qnum, validation_errors[fcret]); + } else { + queue->connection_id = + be64_to_cpu(conn_acc->connectid.connection_id); + set_bit(NVME_FC_Q_CONNECTED, &queue->flags); + } + +out_free_buffer: + kfree(lsop); +out_no_memory: + if (ret) + dev_err(ctrl->dev, + "queue %d connect command failed (%d).\n", + queue->qnum, ret); + return ret; +} + +static int +nvme_fc_disconnect_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue) +{ + struct fcnvme_ls_disconnect_rqst *discon_rqst; + struct fcnvme_ls_disconnect_acc *discon_acc; + struct nvmefc_ls_req_op *lsop; + struct nvmefc_ls_req *lsreq; + int ret, qid = queue->qnum, fcret = 0; + + BUG_ON(qid > ctrl->queue_count); + + lsop = kzalloc((sizeof(*lsop) + + ctrl->lport->ops->lsrqst_priv_sz + + sizeof(*discon_rqst) + sizeof(*discon_acc)), + GFP_KERNEL); + if (!lsop) { + ret = -ENOMEM; + goto out_no_memory; + } + lsreq = &lsop->ls_req; + + lsreq->private = (void *)&lsop[1]; + discon_rqst = (struct fcnvme_ls_disconnect_rqst *) + (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz); + discon_acc = (struct fcnvme_ls_disconnect_acc *)&discon_rqst[1]; + + discon_rqst->w0.ls_cmd = FCNVME_LS_DISCONNECT; + discon_rqst->desc_list_len = cpu_to_be32( + sizeof(struct fcnvme_lsdesc_assoc_id) + + sizeof(struct fcnvme_lsdesc_disconn_cmd)); + + discon_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); + discon_rqst->associd.desc_len = + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_assoc_id); + + BUG_ON(!ctrl->association_id); /* should be set */ + discon_rqst->associd.association_id = cpu_to_be64(ctrl->association_id); + + discon_rqst->discon_cmd.desc_tag = cpu_to_be32( + FCNVME_LSDESC_DISCONN_CMD); + discon_rqst->discon_cmd.desc_len = + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_disconn_cmd); + discon_rqst->discon_cmd.scope = FCNVME_DISCONN_CONNECTION; + discon_rqst->discon_cmd.id = cpu_to_be64(queue->connection_id); + + lsreq->rqstaddr = discon_rqst; + lsreq->rqstlen = sizeof(*discon_rqst); + lsreq->rspaddr = discon_acc; + lsreq->rsplen = sizeof(*discon_acc); + lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC; + + ret = nvme_fc_send_ls_req(ctrl, lsop); + if (ret) + goto out_free_buffer; + + /* validate the ACC response */ + if (discon_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC) + fcret = VERR_LSACC; + if (discon_acc->hdr.desc_list_len != + FCNVME_LSDESC_LEN(struct fcnvme_ls_disconnect_acc)) + fcret = VERR_DISCONN_ACC_LEN; + if (discon_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST)) + fcret = VERR_LSDESC_RQST; + else if (discon_acc->hdr.rqst.desc_len != + FCNVME_LSDESC_LEN(struct fcnvme_lsdesc_rqst)) + fcret = VERR_LSDESC_RQST_LEN; + else if (discon_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_DISCONNECT) + fcret = VERR_DISCONN; + + if (fcret) { + /* Log the error but don't report failure */ + dev_err(ctrl->dev, + "queue %d disconnect failed: %s\n", + qid, validation_errors[fcret]); + } + + queue->connection_id = 0; + if (!qid) + ctrl->association_id = 0; + clear_bit(NVME_FC_Q_CONNECTED, &queue->flags); + +out_free_buffer: + kfree(lsop); +out_no_memory: + if (ret) + dev_err(ctrl->dev, + "queue %d connect command failed (%d).\n", qid, ret); + return ret; +} + + + +/* *********************** NVME Ctrl Routines **************************** */ + + +static int +nvme_fc_reinit_request(void *data, struct request *rq) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + + memset(cmdiu, 0, sizeof(*cmdiu)); + cmdiu->scsi_id = NVME_CMD_SCSI_ID; + cmdiu->fc_id = NVME_CMD_FC_ID; + cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32)); + memset(&op->rsp_iu, 0, sizeof(op->rsp_iu)); + + return 0; +} + +static void +__nvme_fc_exit_request(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_fcp_op *op) +{ + dma_unmap_single(ctrl->lport->dev, op->fcp_req.rspdma, + sizeof(op->rsp_iu), DMA_FROM_DEVICE); + dma_unmap_single(ctrl->lport->dev, op->fcp_req.cmddma, + sizeof(op->cmd_iu), DMA_TO_DEVICE); + + atomic_set(&op->state, FCPOP_STATE_UNINIT); +} + +static void +nvme_fc_exit_request(void *data, struct request *rq, + unsigned int hctx_idx, unsigned int rq_idx) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + + return __nvme_fc_exit_request(data, op); +} + +static void +nvme_fc_exit_aen_ops(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_fcp_op *aen_op = ctrl->aen_ops; + int i; + + for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) { + if (atomic_read(&aen_op->state) == FCPOP_STATE_UNINIT) + continue; + __nvme_fc_exit_request(ctrl, aen_op); + } +} + +void +nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) +{ + struct nvme_fc_fcp_op *op = + container_of(req, struct nvme_fc_fcp_op, fcp_req); + struct request *rq = op->rq; + struct nvmefc_fcp_req *freq = &op->fcp_req; + struct nvme_fc_ctrl *ctrl = op->ctrl; + struct nvme_fc_queue *queue = op->queue; + struct nvme_completion *cqe = &op->rsp_iu.cqe; + int status, llddstatus = freq->status; + + dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma, + sizeof(op->rsp_iu), DMA_FROM_DEVICE); + + /* + * If successful and ERSP, use the returned CQE + * + * Otherwise, there isn't a CQE or it may not have valid content. + * FC-NVME will need to fudge one up. We also need to fudge up + * CQE's for LLDD/transport errors. + */ + + /* + * if length of the received response is 0 or 12 and llddstatus is 0, + * then a successful response is assumed. But, need to create a CQE. + */ + if (!llddstatus && (!freq->rcv_rsplen || + (freq->rcv_rsplen == NVME_FC_SIZEOF_ZEROS_RSP))) { + + memset(cqe, 0, sizeof(*cqe)); + cqe->sq_head = cpu_to_le16(queue->sqhd); + cqe->command_id = cpu_to_le16(op->rqno); + goto validation_done; + } + + /* successful ersp */ + if ((!llddstatus) && + (freq->rcv_rsplen == sizeof(struct nvme_fc_ersp_iu))) { + /* validate it */ + if (unlikely(be16_to_cpu(op->rsp_iu.iu_len) != + (freq->rcv_rsplen/4))) + llddstatus = NVME_SC_FC_FORMAT; + else if (unlikely(op->rqno != le16_to_cpu(cqe->command_id))) + llddstatus = NVME_SC_FC_CMDID_MISMATCH; + else { + /* passed validation, use the cqe */ + /* TODO: fix sqhd - deal with out of order */ + queue->sqhd = le16_to_cpu(cqe->sq_head); + queue->seqno = be32_to_cpu(op->rsp_iu.rsn); + goto validation_done; + } + /* if error - will fall thru below */ + + /* + * TODO: must return ERSP completions to the nvme layer + * in order in order to properly communicate SQHD. + */ + + /* if a bad length */ + } else if (!llddstatus) + llddstatus = NVME_SC_FC_FORMAT; + + /* we have validation errors or a lldd/transport error */ + memset(cqe, 0, sizeof(*cqe)); + cqe->sq_head = cpu_to_le16(queue->sqhd); + cqe->command_id = cpu_to_le16(op->rqno); + cqe->status = cpu_to_le16(llddstatus << 1); + +validation_done: + + if (!queue->qnum && IS_AEN_COMMAND(cqe->command_id)) { + nvme_complete_async_event(&queue->ctrl->ctrl, cqe); + return; + } + + status = le16_to_cpu(cqe->status); + status >>= 1; + + if (rq->cmd_type == REQ_TYPE_DRV_PRIV && rq->special) + memcpy(rq->special, cqe, sizeof(*cqe)); + + blk_mq_complete_request(rq, status); +} + +static int +__nvme_fc_init_request(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, struct nvme_fc_fcp_op *op, + struct request *rq, u32 rqno) +{ + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + int ret = 0; + + /* + * TODO: Set queue related dma relationships + * + if (rqno == 0) { + blk_queue_max_segments(rq->q, min_t(u16, NVME_FC_MAX_SEGMENTS, + ctrl->lport->ops->max_sgl_segments)); + blk_queue_max_integrity_segments(rq->q, + min_t(u16, NVME_FC_MAX_SEGMENTS, + ctrl->lport->ops->max_dif_sgl_segments)); + blk_queue_segment_boundary(rq->q, + ctrl->lport->ops->dma_boundary)); + dma_set_seg_boundary(ctrl->ctrl.device, template->dma_boundary); + } + */ + + memset(op, 0, sizeof(*op)); + op->fcp_req.cmdaddr = &op->cmd_iu; + op->fcp_req.cmdlen = sizeof(op->cmd_iu); + op->fcp_req.rspaddr = &op->rsp_iu; + op->fcp_req.rsplen = sizeof(op->rsp_iu); + op->fcp_req.done = nvme_fc_fcpio_done; + op->fcp_req.first_sgl = (struct scatterlist *)&op[1]; + op->fcp_req.private = &op->fcp_req.first_sgl[SG_CHUNK_SIZE]; + op->ctrl = ctrl; + op->queue = queue; + op->rq = rq; + op->rqno = rqno; + init_completion(&op->abort_done); + + cmdiu->scsi_id = NVME_CMD_SCSI_ID; + cmdiu->fc_id = NVME_CMD_FC_ID; + cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32)); + + /* TODO: better to use dma_map_page() ? */ + op->fcp_req.cmddma = dma_map_single(ctrl->lport->dev, + &op->cmd_iu, sizeof(op->cmd_iu), DMA_TO_DEVICE); + if (dma_mapping_error(ctrl->lport->dev, op->fcp_req.cmddma)) { + dev_err(ctrl->dev, + "FCP Op failed - cmdiu dma mapping failed.\n"); + ret = EFAULT; + goto out_on_error; + } + /* TODO: better to use dma_map_page() ? */ + op->fcp_req.rspdma = dma_map_single(ctrl->lport->dev, + &op->rsp_iu, sizeof(op->rsp_iu), + DMA_FROM_DEVICE); + if (dma_mapping_error(ctrl->lport->dev, op->fcp_req.rspdma)) { + dev_err(ctrl->dev, + "FCP Op failed - rspiu dma mapping failed.\n"); + ret = EFAULT; + } + + atomic_set(&op->state, FCPOP_STATE_IDLE); +out_on_error: + return ret; +} + +static int +nvme_fc_init_request(void *data, struct request *rq, + unsigned int hctx_idx, unsigned int rq_idx, + unsigned int numa_node) +{ + struct nvme_fc_ctrl *ctrl = data; + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_queue *queue = &ctrl->queues[hctx_idx+1]; + + return __nvme_fc_init_request(ctrl, queue, op, rq, queue->rqcnt++); +} + +static int +nvme_fc_init_admin_request(void *data, struct request *rq, + unsigned int hctx_idx, unsigned int rq_idx, + unsigned int numa_node) +{ + struct nvme_fc_ctrl *ctrl = data; + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_queue *queue = &ctrl->queues[0]; + + return __nvme_fc_init_request(ctrl, queue, op, rq, queue->rqcnt++); +} + +static int +nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_fcp_op *aen_op; + struct nvme_fc_cmd_iu *cmdiu; + struct nvme_command *sqe; + int i, ret; + + aen_op = ctrl->aen_ops; + for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) { + cmdiu = &aen_op->cmd_iu; + sqe = &cmdiu->sqe; + ret = __nvme_fc_init_request(ctrl, &ctrl->queues[0], + aen_op, (struct request *)NULL, + (AEN_CMDID_BASE + i)); + if (ret) + return ret; + + memset(sqe, 0, sizeof(*sqe)); + sqe->common.opcode = nvme_admin_async_event; + sqe->common.command_id = AEN_CMDID_BASE + i; + } + return 0; +} + + +static inline void +__nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, struct nvme_fc_ctrl *ctrl, + unsigned int qidx) +{ + struct nvme_fc_queue *queue = &ctrl->queues[qidx]; + + hctx->driver_data = queue; + queue->hctx = hctx; +} + +static int +nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_fc_ctrl *ctrl = data; + + BUG_ON((hctx_idx + 1) >= ctrl->queue_count); + + __nvme_fc_init_hctx(hctx, ctrl, hctx_idx + 1); + + return 0; +} + +static int +nvme_fc_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int hctx_idx) +{ + struct nvme_fc_ctrl *ctrl = data; + + BUG_ON(hctx_idx != 0); + + __nvme_fc_init_hctx(hctx, ctrl, hctx_idx); + + return 0; +} + +static int +nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx, size_t queue_size) +{ + struct nvme_fc_queue *queue; + + queue = &ctrl->queues[idx]; + memset(queue, 0, sizeof(*queue)); + queue->ctrl = ctrl; + queue->qnum = idx; + atomic_set(&queue->csn, 1); + queue->dev = ctrl->dev; + + if (idx > 0) + queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; + else + queue->cmnd_capsule_len = sizeof(struct nvme_command); + + queue->queue_size = queue_size; + + /* + * Considered whether we should allocate buffers for all SQEs + * and CQEs and dma map them - mapping their respective entries + * into the request structures (kernel vm addr and dma address) + * thus the driver could use the buffers/mappings directly. + * It only makes sense if the LLDD would use them for its + * messaging api. It's very unlikely most adapter api's would use + * a native NVME sqe/cqe. More reasonable if FC-NVME IU payload + * structures were used instead. For now - just pass the + * sqe/cqes to the driver and let it deal with it. We'll figure + * out if the FC-NVME IUs make sense later. + */ + + return 0; +} + +static void +nvme_fc_free_queue(struct nvme_fc_queue *queue) +{ + struct nvme_fc_ctrl *ctrl = queue->ctrl; + + if (!test_and_clear_bit(NVME_FC_Q_CONNECTED, &queue->flags)) + return; + + nvme_fc_disconnect_queue(ctrl, queue); + + /* TODO - kill off all outstanding io on the queue */ +} + +static void +__nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, unsigned int qidx) +{ + if (ctrl->lport->ops->delete_queue) + ctrl->lport->ops->delete_queue(&ctrl->lport->localport, qidx, + queue->lldd_handle); + queue->lldd_handle = NULL; +} + +static void +nvme_fc_destroy_admin_queue(struct nvme_fc_ctrl *ctrl) +{ + __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); + blk_cleanup_queue(ctrl->ctrl.admin_q); + blk_mq_free_tag_set(&ctrl->admin_tag_set); + nvme_fc_free_queue(&ctrl->queues[0]); +} + +static void +nvme_fc_free_io_queues(struct nvme_fc_ctrl *ctrl) +{ + int i; + + for (i = 1; i < ctrl->queue_count; i++) + nvme_fc_free_queue(&ctrl->queues[i]); +} + +static int +__nvme_fc_create_hw_queue(struct nvme_fc_ctrl *ctrl, + struct nvme_fc_queue *queue, unsigned int qidx, u16 qsize) +{ + int ret = 0; + + queue->lldd_handle = NULL; + if (ctrl->lport->ops->create_queue) + ret = ctrl->lport->ops->create_queue(&ctrl->lport->localport, + qidx, qsize, &queue->lldd_handle); + + return ret; +} + +static void +nvme_fc_delete_hw_io_queues(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_queue *queue = &ctrl->queues[ctrl->queue_count - 1]; + int i; + + for (i = ctrl->queue_count - 1; i >= 1; i--, queue--) + __nvme_fc_delete_hw_queue(ctrl, queue, i); +} + +static int +nvme_fc_create_hw_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) +{ + struct nvme_fc_queue *queue = &ctrl->queues[1]; + int i, j, ret; + + for (i = 1; i < ctrl->queue_count; i++, queue++) { + ret = __nvme_fc_create_hw_queue(ctrl, queue, i, qsize); + if (ret) { + for (j = i-1; j >= 0; j--) + __nvme_fc_delete_hw_queue(ctrl, + &ctrl->queues[j], j); + return ret; + } + } + + return 0; +} + +static int +nvme_fc_connect_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize) +{ + int i, ret = 0; + + for (i = 1; i < ctrl->queue_count; i++) { + ret = nvme_fc_connect_queue(ctrl, &ctrl->queues[i], qsize, + (qsize / 5)); + if (ret) + break; + ret = nvmf_connect_io_queue(&ctrl->ctrl, i); + if (ret) + break; + } + + return ret; +} + +static int +nvme_fc_init_io_queues(struct nvme_fc_ctrl *ctrl) +{ + int i, ret; + + for (i = 1; i < ctrl->queue_count; i++) { + ret = nvme_fc_init_queue(ctrl, i, ctrl->ctrl.sqsize); + if (ret) { + dev_info(ctrl->ctrl.device, + "failed to initialize i/o queue %d: %d\n", + i, ret); + } + } + + return 0; +} + +/* + * All accesses from nvme core layer done - can now free the + * controller. + * Called after last nvme_put_ctrl() call + */ +static void +nvme_fc_free_nvme_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); + + /* + * if we've already started down this path, controller + * will already be unlinked. + */ + if (list_empty(&ctrl->ctrl_list)) + goto free_ctrl; + + mutex_lock(&nvme_fc_ctrl_mutex); + list_del(&ctrl->ctrl_list); + mutex_unlock(&nvme_fc_ctrl_mutex); + + if (nctrl->tagset) { + blk_cleanup_queue(ctrl->ctrl.connect_q); + blk_mq_free_tag_set(&ctrl->tag_set); + } + kfree(ctrl->queues); + nvmf_free_options(nctrl->opts); +free_ctrl: + kfree(ctrl); +} + + +enum blk_eh_timer_return +nvme_fc_timeout(struct request *rq, bool reserved) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_ctrl *ctrl = op->ctrl; + int state; + + if (reserved) + return BLK_EH_RESET_TIMER; + + state = atomic_xchg(&op->state, FCPOP_STATE_ABORTED); + if (state != FCPOP_STATE_ACTIVE) { + atomic_set(&op->state, state); + return BLK_EH_HANDLED; + } + + ctrl->lport->ops->fcp_abort(&ctrl->lport->localport, + &ctrl->rport->remoteport, + op->queue->lldd_handle, + &op->fcp_req); + + wait_for_completion(&op->abort_done); + + /* fail with DNR on cmd timeout */ + rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR; + + init_completion(&op->abort_done); + + return BLK_EH_HANDLED; +} + +static int +nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq, + struct nvme_fc_fcp_op *op) +{ + struct nvmefc_fcp_req *freq = &op->fcp_req; + u32 map_len = nvme_map_len(rq); + int ret; + + freq->sg_cnt = 0; + + if (!map_len) + return 0; + + freq->sg_table.sgl = freq->first_sgl; + ret = sg_alloc_table_chained(&freq->sg_table, rq->nr_phys_segments, + freq->sg_table.sgl); + if (ret) + return -ENOMEM; + + op->nents = blk_rq_map_sg(rq->q, rq, freq->sg_table.sgl); + BUG_ON(op->nents > rq->nr_phys_segments); + freq->sg_cnt = dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl, + op->nents, ((rq_data_dir(rq) == WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE)); + if (unlikely(freq->sg_cnt <= 0)) { + sg_free_table_chained(&freq->sg_table, true); + freq->sg_cnt = 0; + return -EFAULT; + } + + /* + * TODO: blk_integrity_rq(rq) for DIX + */ + return 0; +} + +static void +nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq, + struct nvme_fc_fcp_op *op) +{ + struct nvmefc_fcp_req *freq = &op->fcp_req; + + if (!freq->sg_cnt) + return; + + dma_unmap_sg(ctrl->lport->dev, freq->sg_table.sgl, op->nents, + ((rq_data_dir(rq) == WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE)); + + nvme_cleanup_cmd(rq); + + sg_free_table_chained(&freq->sg_table, true); + + freq->sg_cnt = 0; +} + +static int +nvme_fc_start_fcp_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue, + struct nvme_fc_fcp_op *op, u32 data_len, + enum nvmefc_fcp_datadir io_dir) +{ + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + struct nvme_command *sqe = &cmdiu->sqe; + u32 csn; + int ret; + + /* format the FC-NVME CMD IU and fcp_req */ + cmdiu->connection_id = cpu_to_be64(queue->connection_id); + csn = atomic_inc_return(&queue->csn); + cmdiu->csn = cpu_to_be32(csn); + cmdiu->data_len = cpu_to_be32(data_len); + switch (io_dir) { + case NVMEFC_FCP_WRITE: + cmdiu->flags = FCNVME_CMD_FLAGS_WRITE; + break; + case NVMEFC_FCP_READ: + cmdiu->flags = FCNVME_CMD_FLAGS_READ; + break; + case NVMEFC_FCP_NODATA: + cmdiu->flags = 0; + break; + } + op->fcp_req.payload_length = data_len; + op->fcp_req.io_dir = io_dir; + op->fcp_req.transferred_length = 0; + op->fcp_req.rcv_rsplen = 0; + op->fcp_req.status = 0; + + /* + * validate per fabric rules, set fields mandated by fabric spec + * as well as those by FC-NVME spec. + */ + WARN_ON_ONCE(sqe->common.metadata); + WARN_ON_ONCE(sqe->common.dptr.prp1); + WARN_ON_ONCE(sqe->common.dptr.prp2); + sqe->common.flags |= NVME_CMD_SGL_METABUF; + + /* + * format SQE DPTR field per FC-NVME rules + * type=data block descr; subtype=offset; + * offset is currently 0. + */ + sqe->rw.dptr.sgl.type = NVME_SGL_FMT_OFFSET; + sqe->rw.dptr.sgl.length = cpu_to_le32(data_len); + sqe->rw.dptr.sgl.addr = 0; + + /* odd that we set the command_id - should come from nvme-fabrics */ + WARN_ON_ONCE(sqe->common.command_id != cpu_to_le16(op->rqno)); + + if (op->rq) { /* skipped on aens */ + ret = nvme_fc_map_data(ctrl, op->rq, op); + if (ret < 0) { + dev_err(queue->ctrl->ctrl.device, + "Failed to map data (%d)\n", ret); + nvme_cleanup_cmd(op->rq); + return (ret == -ENOMEM || ret == -EAGAIN) ? + BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR; + } + } + + dma_sync_single_for_device(ctrl->lport->dev, op->fcp_req.cmddma, + sizeof(op->cmd_iu), DMA_TO_DEVICE); + + atomic_set(&op->state, FCPOP_STATE_ACTIVE); + + if (op->rq) + blk_mq_start_request(op->rq); + + ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport, + &ctrl->rport->remoteport, + queue->lldd_handle, &op->fcp_req); + + if (ret) { + dev_err(ctrl->dev, + "Send nvme command failed - lldd returned %d.\n", ret); + + if (op->rq) { /* normal request */ + nvme_fc_unmap_data(ctrl, op->rq, op); + nvme_cleanup_cmd(op->rq); + if (ret != -EBUSY) { + /* complete the io w/ error status */ + blk_mq_complete_request(op->rq, + NVME_SC_FC_TRANSPORT_ERROR); + } else { + blk_mq_stop_hw_queues(op->rq->q); + nvme_requeue_req(op->rq); + blk_mq_delay_queue(queue->hctx, + NVMEFC_QUEUE_DELAY); + } + } else { /* aen */ + struct nvme_completion *cqe = &op->rsp_iu.cqe; + + cqe->status = (NVME_SC_FC_TRANSPORT_ERROR << 1); + nvme_complete_async_event(&queue->ctrl->ctrl, cqe); + } + } + + return BLK_MQ_RQ_QUEUE_OK; +} + +static int +nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_fc_queue *queue = hctx->driver_data; + struct nvme_fc_ctrl *ctrl = queue->ctrl; + struct request *rq = bd->rq; + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu; + struct nvme_command *sqe = &cmdiu->sqe; + enum nvmefc_fcp_datadir io_dir; + u32 data_len; + int ret; + + ret = nvme_setup_cmd(ns, rq, sqe); + if (ret) + return ret; + + data_len = nvme_map_len(rq); + if (data_len) + io_dir = ((rq_data_dir(rq) == WRITE) ? + NVMEFC_FCP_WRITE : NVMEFC_FCP_READ); + else + io_dir = NVMEFC_FCP_NODATA; + + return nvme_fc_start_fcp_op(ctrl, queue, op, data_len, io_dir); +} + +static void +nvme_fc_submit_async_event(struct nvme_ctrl *arg, int aer_idx) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg); + struct nvme_fc_fcp_op *aen_op; + int ret; + + if (aer_idx > NVME_FC_NR_AEN_COMMANDS) + return; + + aen_op = &ctrl->aen_ops[aer_idx]; + + ret = nvme_fc_start_fcp_op(ctrl, aen_op->queue, aen_op, 0, + NVMEFC_FCP_NODATA); + if (ret) + dev_err(ctrl->ctrl.device, + "failed async event work [%d]\n", aer_idx); +} + +static void +nvme_fc_complete_rq(struct request *rq) +{ + struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq); + struct nvme_fc_ctrl *ctrl = op->ctrl; + int error = 0, state; + + state = atomic_xchg(&op->state, FCPOP_STATE_IDLE); + + nvme_cleanup_cmd(rq); + + nvme_fc_unmap_data(ctrl, rq, op); + + if (state == FCPOP_STATE_ABORTED) + complete(&op->abort_done); + + if (unlikely(rq->errors)) { + if (nvme_req_needs_retry(rq, rq->errors)) { + nvme_requeue_req(rq); + return; + } + + if (rq->cmd_type == REQ_TYPE_DRV_PRIV) + error = rq->errors; + else + error = nvme_error_status(rq->errors); + } + + blk_mq_end_request(rq, error); +} + +static struct blk_mq_ops nvme_fc_mq_ops = { + .queue_rq = nvme_fc_queue_rq, + .complete = nvme_fc_complete_rq, + .map_queue = blk_mq_map_queue, + .init_request = nvme_fc_init_request, + .exit_request = nvme_fc_exit_request, + .reinit_request = nvme_fc_reinit_request, + .init_hctx = nvme_fc_init_hctx, + .timeout = nvme_fc_timeout, +}; + +static struct blk_mq_ops nvme_fc_admin_mq_ops = { + .queue_rq = nvme_fc_queue_rq, + .complete = nvme_fc_complete_rq, + .map_queue = blk_mq_map_queue, + .init_request = nvme_fc_init_admin_request, + .exit_request = nvme_fc_exit_request, + .reinit_request = nvme_fc_reinit_request, + .init_hctx = nvme_fc_init_admin_hctx, + .timeout = nvme_fc_timeout, +}; + +static int +nvme_fc_configure_admin_queue(struct nvme_fc_ctrl *ctrl) +{ + u32 segs; + int error; + + error = nvme_fc_init_queue(ctrl, 0, NVME_FC_AQ_BLKMQ_DEPTH); + if (error) + return error; + + error = nvme_fc_connect_admin_queue(ctrl, &ctrl->queues[0], + NVME_FC_AQ_BLKMQ_DEPTH, + (NVME_FC_AQ_BLKMQ_DEPTH / 4)); + if (error) + return error; + + memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); + ctrl->admin_tag_set.ops = &nvme_fc_admin_mq_ops; + ctrl->admin_tag_set.queue_depth = NVME_FC_AQ_BLKMQ_DEPTH; + ctrl->admin_tag_set.reserved_tags = 2; /* fabric connect + Keep-Alive */ + ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; + ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) + + (SG_CHUNK_SIZE * + sizeof(struct scatterlist)) + + ctrl->lport->ops->fcprqst_priv_sz; + ctrl->admin_tag_set.driver_data = ctrl; + ctrl->admin_tag_set.nr_hw_queues = 1; + ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; + + error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); + if (error) + goto out_free_queue; + + ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + if (IS_ERR(ctrl->ctrl.admin_q)) { + error = PTR_ERR(ctrl->ctrl.admin_q); + goto out_free_tagset; + } + + error = __nvme_fc_create_hw_queue(ctrl, &ctrl->queues[0], 0, + NVME_FC_AQ_BLKMQ_DEPTH); + if (error) + goto out_cleanup_queue; + + error = nvmf_connect_admin_queue(&ctrl->ctrl); + if (error) + goto out_delete_hw_queue; + + error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap); + if (error) { + dev_err(ctrl->ctrl.device, + "prop_get NVME_REG_CAP failed\n"); + goto out_delete_hw_queue; + } + + ctrl->ctrl.sqsize = + min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize); + + error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); + if (error) + goto out_delete_hw_queue; + + segs = min_t(u32, NVME_FC_MAX_SEGMENTS, + ctrl->lport->ops->max_sgl_segments); + ctrl->ctrl.max_hw_sectors = (segs - 1) << (PAGE_SHIFT - 9); + + error = nvme_init_identify(&ctrl->ctrl); + if (error) + goto out_delete_hw_queue; + + nvme_start_keep_alive(&ctrl->ctrl); + + return 0; + +out_delete_hw_queue: + __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); +out_cleanup_queue: + blk_cleanup_queue(ctrl->ctrl.admin_q); +out_free_tagset: + blk_mq_free_tag_set(&ctrl->admin_tag_set); +out_free_queue: + nvme_fc_free_queue(&ctrl->queues[0]); + return error; +} + + +/* + * Called to terminate an association. + * Maybe called with association fully in place or partially in place. + */ +static void +nvme_fc_shutdown_ctrl(struct nvme_fc_ctrl *ctrl) +{ + nvme_stop_keep_alive(&ctrl->ctrl); + + if (ctrl->queue_count > 1) { + nvme_stop_queues(&ctrl->ctrl); + blk_mq_tagset_busy_iter(&ctrl->tag_set, + nvme_cancel_request, &ctrl->ctrl); + nvme_fc_delete_hw_io_queues(ctrl); + nvme_fc_free_io_queues(ctrl); + } + + if (ctrl->ctrl.state == NVME_CTRL_LIVE) + nvme_shutdown_ctrl(&ctrl->ctrl); + + blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); + blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, + nvme_cancel_request, &ctrl->ctrl); + nvme_fc_exit_aen_ops(ctrl); + nvme_fc_destroy_admin_queue(ctrl); +} + + +static void +__nvme_fc_remove_ctrl(struct nvme_fc_ctrl *ctrl) +{ + nvme_remove_namespaces(&ctrl->ctrl); + nvme_fc_shutdown_ctrl(ctrl); + nvme_uninit_ctrl(&ctrl->ctrl); + nvme_put_ctrl(&ctrl->ctrl); +} + +static void +nvme_fc_del_ctrl_work(struct work_struct *work) +{ + struct nvme_fc_ctrl *ctrl = container_of(work, + struct nvme_fc_ctrl, delete_work); + + mutex_lock(&nvme_fc_ctrl_mutex); + __nvme_fc_remove_ctrl(ctrl); + mutex_unlock(&nvme_fc_ctrl_mutex); +} + +static int +__nvme_fc_del_ctrl(struct nvme_fc_ctrl *ctrl) +{ + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) + return -EBUSY; + + if (!queue_work(nvme_fc_wq, &ctrl->delete_work)) + return -EBUSY; + + return 0; +} + +/* + * Request from nvme core layer to delete the controller + */ +static int +nvme_fc_del_nvme_ctrl(struct nvme_ctrl *nctrl) +{ + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); + int ret; + + mutex_lock(&nvme_fc_ctrl_mutex); + ret = __nvme_fc_del_ctrl(ctrl); + mutex_unlock(&nvme_fc_ctrl_mutex); + if (ret) + return ret; + + flush_work(&ctrl->delete_work); + + return 0; +} + +static int +nvme_fc_reset_nvme_ctrl(struct nvme_ctrl *nctrl) +{ + return -EIO; +} + +static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = { + .name = "fc", + .module = THIS_MODULE, + .is_fabrics = true, + .reg_read32 = nvmf_reg_read32, + .reg_read64 = nvmf_reg_read64, + .reg_write32 = nvmf_reg_write32, + .reset_ctrl = nvme_fc_reset_nvme_ctrl, + .free_ctrl = nvme_fc_free_nvme_ctrl, + .submit_async_event = nvme_fc_submit_async_event, + .delete_ctrl = nvme_fc_del_nvme_ctrl, + .get_subsysnqn = nvmf_get_subsysnqn, + .get_address = nvmf_get_address, +}; + +static int +nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl) +{ + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + int ret; + + ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues); + if (ret) { + dev_info(ctrl->ctrl.device, + "set_queue_count failed: %d\n", ret); + return ret; + } + + ctrl->queue_count = opts->nr_io_queues + 1; + if (!opts->nr_io_queues) + return 0; + + dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", + opts->nr_io_queues); + + ret = nvme_fc_init_io_queues(ctrl); + if (ret) + return ret; + + memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); + ctrl->tag_set.ops = &nvme_fc_mq_ops; + ctrl->tag_set.queue_depth = ctrl->ctrl.sqsize; + ctrl->tag_set.reserved_tags = 1; /* fabric connect */ + ctrl->tag_set.numa_node = NUMA_NO_NODE; + ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + ctrl->tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) + + (SG_CHUNK_SIZE * + sizeof(struct scatterlist)) + + ctrl->lport->ops->fcprqst_priv_sz; + ctrl->tag_set.driver_data = ctrl; + ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1; + ctrl->tag_set.timeout = NVME_IO_TIMEOUT; + + ret = blk_mq_alloc_tag_set(&ctrl->tag_set); + if (ret) + return ret; + + ctrl->ctrl.tagset = &ctrl->tag_set; + + ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); + if (IS_ERR(ctrl->ctrl.connect_q)) { + ret = PTR_ERR(ctrl->ctrl.connect_q); + goto out_free_tag_set; + } + + ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize); + if (ret) + goto out_cleanup_blk_queue; + + ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize); + if (ret) + goto out_delete_hw_queues; + + return 0; + +out_delete_hw_queues: + nvme_fc_delete_hw_io_queues(ctrl); +out_cleanup_blk_queue: + nvme_stop_keep_alive(&ctrl->ctrl); + blk_cleanup_queue(ctrl->ctrl.connect_q); +out_free_tag_set: + blk_mq_free_tag_set(&ctrl->tag_set); + nvme_fc_free_io_queues(ctrl); + + return ret; +} + + +static struct nvme_ctrl * +__nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, + struct nvme_fc_lport *lport, struct nvme_fc_rport *rport) +{ + struct nvme_fc_ctrl *ctrl; + int ret; + bool changed; + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return ERR_PTR(-ENOMEM); + ctrl->ctrl.opts = opts; + INIT_LIST_HEAD(&ctrl->ctrl_list); + ctrl->lport = lport; + ctrl->l_id = lport->localport.port_num; + ctrl->rport = rport; + ctrl->r_id = rport->remoteport.port_num; + ctrl->dev = lport->dev; + + ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_fc_ctrl_ops, 0); + if (ret) + goto out_free_ctrl; + + INIT_WORK(&ctrl->delete_work, nvme_fc_del_ctrl_work); + spin_lock_init(&ctrl->lock); + + /* io queue count */ + ctrl->queue_count = min_t(unsigned int, + opts->nr_io_queues, + lport->ops->max_hw_queues); + opts->nr_io_queues = ctrl->queue_count; /* so opts has valid value */ + ctrl->queue_count++; /* +1 for admin queue */ + + ctrl->ctrl.sqsize = opts->queue_size; + ctrl->ctrl.kato = opts->kato; + + ret = -ENOMEM; + ctrl->queues = kcalloc(ctrl->queue_count, sizeof(struct nvme_fc_queue), + GFP_KERNEL); + if (!ctrl->queues) + goto out_uninit_ctrl; + + ret = nvme_fc_configure_admin_queue(ctrl); + if (ret) + goto out_kfree_queues; + + /* sanity checks */ + + if (ctrl->ctrl.ioccsz != 4) { + dev_err(ctrl->ctrl.device, "ioccsz %d is not supported!\n", + ctrl->ctrl.ioccsz); + goto out_remove_admin_queue; + } + if (ctrl->ctrl.iorcsz != 1) { + dev_err(ctrl->ctrl.device, "iorcsz %d is not supported!\n", + ctrl->ctrl.iorcsz); + goto out_remove_admin_queue; + } + if (ctrl->ctrl.icdoff) { + dev_err(ctrl->ctrl.device, "icdoff %d is not supported!\n", + ctrl->ctrl.icdoff); + goto out_remove_admin_queue; + } + + if (opts->queue_size > ctrl->ctrl.maxcmd) { + /* warn if maxcmd is lower than queue_size */ + dev_warn(ctrl->ctrl.device, + "queue_size %zu > ctrl maxcmd %u, clamping down\n", + opts->queue_size, ctrl->ctrl.maxcmd); + opts->queue_size = ctrl->ctrl.maxcmd; + } + + ret = nvme_fc_init_aen_ops(ctrl); + if (ret) + goto out_exit_aen_ops; + + if (ctrl->queue_count > 1) { + ret = nvme_fc_create_io_queues(ctrl); + if (ret) + goto out_exit_aen_ops; + } + + changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + WARN_ON_ONCE(!changed); + + dev_info(ctrl->ctrl.device, + "NVME-FC[%d.%d]: new ctrl: NQN \"%s\" (%p)\n", + ctrl->l_id, ctrl->r_id, ctrl->ctrl.opts->subsysnqn, &ctrl); + + kref_get(&ctrl->ctrl.kref); + + mutex_lock(&nvme_fc_ctrl_mutex); + list_add_tail(&ctrl->ctrl_list, &nvme_fc_ctrl_list); + mutex_unlock(&nvme_fc_ctrl_mutex); + + if (opts->nr_io_queues) { + nvme_queue_scan(&ctrl->ctrl); + nvme_queue_async_events(&ctrl->ctrl); + } + + return &ctrl->ctrl; + +out_exit_aen_ops: + nvme_fc_exit_aen_ops(ctrl); +out_remove_admin_queue: + nvme_fc_destroy_admin_queue(ctrl); +out_kfree_queues: + kfree(ctrl->queues); +out_uninit_ctrl: + nvme_uninit_ctrl(&ctrl->ctrl); + nvme_put_ctrl(&ctrl->ctrl); + if (ret > 0) + ret = -EIO; + return ERR_PTR(ret); +out_free_ctrl: + kfree(ctrl); + return ERR_PTR(ret); +} + +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 +nvme_fc_parse_address(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 struct nvme_ctrl * +nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts) +{ + struct nvme_fc_lport *lport; + struct nvme_fc_rport *rport; + struct nvmet_fc_traddr laddr = { 0L, 0L, 0L }; + struct nvmet_fc_traddr raddr = { 0L, 0L, 0L }; + unsigned long flags; + int ret; + + ret = nvme_fc_parse_address(&raddr, opts->traddr); + if ((ret) || !raddr.fab || !raddr.nn || !raddr.pn) + return ERR_PTR(-EINVAL); + + ret = nvme_fc_parse_address(&laddr, opts->host_traddr); + if ((ret) || !laddr.fab || !laddr.nn || !laddr.pn || + (laddr.fab != raddr.fab)) + return ERR_PTR(-EINVAL); + + /* find the host and remote ports to connect together */ + spin_lock_irqsave(&nvme_fc_lock, flags); + list_for_each_entry(lport, &nvme_fc_lport_list, port_list) { + if ((lport->localport.fabric_name != laddr.fab) || + (lport->localport.node_name != laddr.nn) || + (lport->localport.port_name != laddr.pn)) + continue; + + list_for_each_entry(rport, &lport->endp_list, endp_list) { + if ((rport->remoteport.node_name != raddr.nn) || + (rport->remoteport.port_name != raddr.pn)) + continue; + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return __nvme_fc_create_ctrl(dev, opts, lport, rport); + } + } + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return ERR_PTR(-ENOENT); +} + + +static struct nvmf_transport_ops nvme_fc_transport = { + .name = "fc", + .required_opts = NVMF_OPT_TRADDR | NVMF_OPT_HOST_TRADDR, + .create_ctrl = nvme_fc_create_ctrl, +}; + +static int __init nvme_fc_init_module(void) +{ + nvme_fc_wq = create_workqueue("nvme_fc_wq"); + if (!nvme_fc_wq) + return -ENOMEM; + + nvmf_register_transport(&nvme_fc_transport); + return 0; +} + +static void __exit nvme_fc_exit_module(void) +{ + struct nvme_fc_ctrl *ctrl; + + nvmf_unregister_transport(&nvme_fc_transport); + + mutex_lock(&nvme_fc_ctrl_mutex); + list_for_each_entry(ctrl, &nvme_fc_ctrl_list, ctrl_list) + __nvme_fc_del_ctrl(ctrl); + mutex_unlock(&nvme_fc_ctrl_mutex); + + destroy_workqueue(nvme_fc_wq); + + /* release topology elements + * TODO: This is broken: as ctrl delete is async - need to tie + * final topology delete to last controller detach + */ + __nvme_fc_free_ports(); +} + +module_init(nvme_fc_init_module); +module_exit(nvme_fc_exit_module); + +MODULE_LICENSE("GPL v2"); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
