[SCSI] ibmvfc: Add FC Passthru support (d31429e1) · Commits · EulixOS / Software / Kernel

drivers/scsi/ibmvscsi/ibmvfc.c

+279 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,7 @@
		#include <scsi/scsi_device.h>
		#include <scsi/scsi_tcq.h>
		#include <scsi/scsi_transport_fc.h>
		#include <scsi/scsi_bsg_fc.h>
		#include "ibmvfc.h"

		static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
		@@ -1674,6 +1675,276 @@ static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
		complete(&evt->comp);
		}

		/**
		* ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
		* @evt: struct ibmvfc_event
		*
		**/
		static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
		{
		struct ibmvfc_host *vhost = evt->vhost;

		ibmvfc_free_event(evt);
		vhost->aborting_passthru = 0;
		dev_info(vhost->dev, "Passthru command cancelled\n");
		}

		/**
		* ibmvfc_bsg_timeout - Handle a BSG timeout
		* @job: struct fc_bsg_job that timed out
		*
		* Returns:
		* 0 on success / other on failure
		**/
		static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
		{
		struct ibmvfc_host *vhost = shost_priv(job->shost);
		unsigned long port_id = (unsigned long)job->dd_data;
		struct ibmvfc_event *evt;
		struct ibmvfc_tmf *tmf;
		unsigned long flags;
		int rc;

		ENTER;
		spin_lock_irqsave(vhost->host->host_lock, flags);
		if (vhost->aborting_passthru \|\| vhost->state != IBMVFC_ACTIVE) {
		__ibmvfc_reset_host(vhost);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return 0;
		}

		vhost->aborting_passthru = 1;
		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);

		tmf = &evt->iu.tmf;
		memset(tmf, 0, sizeof(*tmf));
		tmf->common.version = 1;
		tmf->common.opcode = IBMVFC_TMF_MAD;
		tmf->common.length = sizeof(*tmf);
		tmf->scsi_id = port_id;
		tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
		tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
		rc = ibmvfc_send_event(evt, vhost, default_timeout);

		if (rc != 0) {
		vhost->aborting_passthru = 0;
		dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
		rc = -EIO;
		} else
		dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
		port_id);

		spin_unlock_irqrestore(vhost->host->host_lock, flags);

		LEAVE;
		return rc;
		}

		/**
		* ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
		* @vhost: struct ibmvfc_host to send command
		* @port_id: port ID to send command
		*
		* Returns:
		* 0 on success / other on failure
		**/
		static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
		{
		struct ibmvfc_port_login *plogi;
		struct ibmvfc_target *tgt;
		struct ibmvfc_event *evt;
		union ibmvfc_iu rsp_iu;
		unsigned long flags;
		int rc = 0, issue_login = 1;

		ENTER;
		spin_lock_irqsave(vhost->host->host_lock, flags);
		list_for_each_entry(tgt, &vhost->targets, queue) {
		if (tgt->scsi_id == port_id) {
		issue_login = 0;
		break;
		}
		}

		if (!issue_login)
		goto unlock_out;
		if (unlikely((rc = ibmvfc_host_chkready(vhost))))
		goto unlock_out;

		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
		plogi = &evt->iu.plogi;
		memset(plogi, 0, sizeof(*plogi));
		plogi->common.version = 1;
		plogi->common.opcode = IBMVFC_PORT_LOGIN;
		plogi->common.length = sizeof(*plogi);
		plogi->scsi_id = port_id;
		evt->sync_iu = &rsp_iu;
		init_completion(&evt->comp);

		rc = ibmvfc_send_event(evt, vhost, default_timeout);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);

		if (rc)
		return -EIO;

		wait_for_completion(&evt->comp);

		if (rsp_iu.plogi.common.status)
		rc = -EIO;

		spin_lock_irqsave(vhost->host->host_lock, flags);
		ibmvfc_free_event(evt);
		unlock_out:
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		LEAVE;
		return rc;
		}

		/**
		* ibmvfc_bsg_request - Handle a BSG request
		* @job: struct fc_bsg_job to be executed
		*
		* Returns:
		* 0 on success / other on failure
		**/
		static int ibmvfc_bsg_request(struct fc_bsg_job *job)
		{
		struct ibmvfc_host *vhost = shost_priv(job->shost);
		struct fc_rport *rport = job->rport;
		struct ibmvfc_passthru_mad *mad;
		struct ibmvfc_event *evt;
		union ibmvfc_iu rsp_iu;
		unsigned long flags, port_id = -1;
		unsigned int code = job->request->msgcode;
		int rc = 0, req_seg, rsp_seg, issue_login = 0;
		u32 fc_flags, rsp_len;

		ENTER;
		job->reply->reply_payload_rcv_len = 0;
		if (rport)
		port_id = rport->port_id;

		switch (code) {
		case FC_BSG_HST_ELS_NOLOGIN:
		port_id = (job->request->rqst_data.h_els.port_id[0] << 16) \|
		(job->request->rqst_data.h_els.port_id[1] << 8) \|
		job->request->rqst_data.h_els.port_id[2];
		case FC_BSG_RPT_ELS:
		fc_flags = IBMVFC_FC_ELS;
		break;
		case FC_BSG_HST_CT:
		issue_login = 1;
		port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) \|
		(job->request->rqst_data.h_ct.port_id[1] << 8) \|
		job->request->rqst_data.h_ct.port_id[2];
		case FC_BSG_RPT_CT:
		fc_flags = IBMVFC_FC_CT_IU;
		break;
		default:
		return -ENOTSUPP;
		};

		if (port_id == -1)
		return -EINVAL;
		if (!mutex_trylock(&vhost->passthru_mutex))
		return -EBUSY;

		job->dd_data = (void *)port_id;
		req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
		job->request_payload.sg_cnt, DMA_TO_DEVICE);

		if (!req_seg) {
		mutex_unlock(&vhost->passthru_mutex);
		return -ENOMEM;
		}

		rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
		job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

		if (!rsp_seg) {
		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
		job->request_payload.sg_cnt, DMA_TO_DEVICE);
		mutex_unlock(&vhost->passthru_mutex);
		return -ENOMEM;
		}

		if (req_seg > 1 \|\| rsp_seg > 1) {
		rc = -EINVAL;
		goto out;
		}

		if (issue_login)
		rc = ibmvfc_bsg_plogi(vhost, port_id);

		spin_lock_irqsave(vhost->host->host_lock, flags);

		if (unlikely(rc \|\| (rport && (rc = fc_remote_port_chkready(rport)))) \|\|
		unlikely((rc = ibmvfc_host_chkready(vhost)))) {
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		goto out;
		}

		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
		mad = &evt->iu.passthru;

		memset(mad, 0, sizeof(*mad));
		mad->common.version = 1;
		mad->common.opcode = IBMVFC_PASSTHRU;
		mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);

		mad->cmd_ioba.va = (u64)evt->crq.ioba +
		offsetof(struct ibmvfc_passthru_mad, iu);
		mad->cmd_ioba.len = sizeof(mad->iu);

		mad->iu.cmd_len = job->request_payload.payload_len;
		mad->iu.rsp_len = job->reply_payload.payload_len;
		mad->iu.flags = fc_flags;
		mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;

		mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
		mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
		mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
		mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
		mad->iu.scsi_id = port_id;
		mad->iu.tag = (u64)evt;
		rsp_len = mad->iu.rsp.len;

		evt->sync_iu = &rsp_iu;
		init_completion(&evt->comp);
		rc = ibmvfc_send_event(evt, vhost, 0);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);

		if (rc) {
		rc = -EIO;
		goto out;
		}

		wait_for_completion(&evt->comp);

		if (rsp_iu.passthru.common.status)
		rc = -EIO;
		else
		job->reply->reply_payload_rcv_len = rsp_len;

		spin_lock_irqsave(vhost->host->host_lock, flags);
		ibmvfc_free_event(evt);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		job->reply->result = rc;
		job->job_done(job);
		rc = 0;
		out:
		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
		job->request_payload.sg_cnt, DMA_TO_DEVICE);
		dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
		job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
		mutex_unlock(&vhost->passthru_mutex);
		LEAVE;
		return rc;
		}

		/**
		* ibmvfc_reset_device - Reset the device with the specified reset type
		* @sdev: scsi device to reset
		@@ -3918,6 +4189,8 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
		rport->supported_classes \|= FC_COS_CLASS2;
		if (tgt->service_parms.class3_parms[0] & 0x80000000)
		rport->supported_classes \|= FC_COS_CLASS3;
		if (rport->rqst_q)
		blk_queue_max_hw_segments(rport->rqst_q, 1);
		} else
		tgt_dbg(tgt, "rport add failed\n");
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		@@ -4357,6 +4630,7 @@ static int ibmvfc_probe(struct vio_dev vdev, const struct vio_device_id id)
		init_waitqueue_head(&vhost->work_wait_q);
		init_waitqueue_head(&vhost->init_wait_q);
		INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
		mutex_init(&vhost->passthru_mutex);

		if ((rc = ibmvfc_alloc_mem(vhost)))
		goto free_scsi_host;
		@@ -4389,6 +4663,8 @@ static int ibmvfc_probe(struct vio_dev vdev, const struct vio_device_id id)
		goto remove_shost;
		}

		if (shost_to_fc_host(shost)->rqst_q)
		blk_queue_max_hw_segments(shost_to_fc_host(shost)->rqst_q, 1);
		dev_set_drvdata(dev, vhost);
		spin_lock(&ibmvfc_driver_lock);
		list_add_tail(&vhost->queue, &ibmvfc_head);
		@@ -4517,6 +4793,9 @@ static struct fc_function_template ibmvfc_transport_functions = {

		.get_starget_port_id = ibmvfc_get_starget_port_id,
		.show_starget_port_id = 1,

		.bsg_request = ibmvfc_bsg_request,
		.bsg_timeout = ibmvfc_bsg_timeout,
		};

		/**

drivers/scsi/ibmvscsi/ibmvfc.h

+7 −1

Original line number	Diff line number	Diff line
		@@ -58,9 +58,10 @@
		* 1 for ERP
		* 1 for initialization
		* 1 for NPIV Logout
		* 2 for BSG passthru
		* 2 for each discovery thread
		*/
		#define IBMVFC_NUM_INTERNAL_REQ (1 + 1 + 1 + (disc_threads * 2))
		#define IBMVFC_NUM_INTERNAL_REQ (1 + 1 + 1 + 2 + (disc_threads * 2))

		#define IBMVFC_MAD_SUCCESS 0x00
		#define IBMVFC_MAD_NOT_SUPPORTED 0xF1
		@@ -466,7 +467,10 @@ struct ibmvfc_passthru_iu {
		u16 error;
		u32 flags;
		#define IBMVFC_FC_ELS 0x01
		#define IBMVFC_FC_CT_IU 0x02
		u32 cancel_key;
		#define IBMVFC_PASSTHRU_CANCEL_KEY 0x80000000
		#define IBMVFC_INTERNAL_CANCEL_KEY 0x80000001
		u32 reserved;
		struct srp_direct_buf cmd;
		struct srp_direct_buf rsp;
		@@ -693,6 +697,7 @@ struct ibmvfc_host {
		int disc_buf_sz;
		int log_level;
		struct ibmvfc_discover_targets_buf *disc_buf;
		struct mutex passthru_mutex;
		int task_set;
		int init_retries;
		int discovery_threads;
		@@ -702,6 +707,7 @@ struct ibmvfc_host {
		int delay_init;
		int scan_complete;
		int logged_in;
		int aborting_passthru;
		int events_to_log;
		#define IBMVFC_AE_LINKUP 0x0001
		#define IBMVFC_AE_LINKDOWN 0x0002