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path: root/drivers/target/tcm_fc/tfc_cmd.c
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Diffstat (limited to 'drivers/target/tcm_fc/tfc_cmd.c')
-rw-r--r--drivers/target/tcm_fc/tfc_cmd.c696
1 files changed, 696 insertions, 0 deletions
diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
new file mode 100644
index 0000000..49e5177
--- /dev/null
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -0,0 +1,696 @@
+/*
+ * Copyright (c) 2010 Cisco Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* XXX TBD some includes may be extraneous */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/configfs.h>
+#include <linux/ctype.h>
+#include <linux/hash.h>
+#include <asm/unaligned.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_configfs.h>
+#include <target/target_core_base.h>
+#include <target/target_core_tmr.h>
+#include <target/configfs_macros.h>
+
+#include "tcm_fc.h"
+
+/*
+ * Dump cmd state for debugging.
+ */
+void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
+{
+ struct fc_exch *ep;
+ struct fc_seq *sp;
+ struct se_cmd *se_cmd;
+ struct se_mem *mem;
+ struct se_transport_task *task;
+
+ if (!(ft_debug_logging & FT_DEBUG_IO))
+ return;
+
+ se_cmd = &cmd->se_cmd;
+ printk(KERN_INFO "%s: cmd %p state %d sess %p seq %p se_cmd %p\n",
+ caller, cmd, cmd->state, cmd->sess, cmd->seq, se_cmd);
+ printk(KERN_INFO "%s: cmd %p cdb %p\n",
+ caller, cmd, cmd->cdb);
+ printk(KERN_INFO "%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
+
+ task = T_TASK(se_cmd);
+ printk(KERN_INFO "%s: cmd %p task %p se_num %u buf %p len %u se_cmd_flags <0x%x>\n",
+ caller, cmd, task, task->t_tasks_se_num,
+ task->t_task_buf, se_cmd->data_length, se_cmd->se_cmd_flags);
+ if (task->t_mem_list)
+ list_for_each_entry(mem, task->t_mem_list, se_list)
+ printk(KERN_INFO "%s: cmd %p mem %p page %p "
+ "len 0x%x off 0x%x\n",
+ caller, cmd, mem,
+ mem->se_page, mem->se_len, mem->se_off);
+ sp = cmd->seq;
+ if (sp) {
+ ep = fc_seq_exch(sp);
+ printk(KERN_INFO "%s: cmd %p sid %x did %x "
+ "ox_id %x rx_id %x seq_id %x e_stat %x\n",
+ caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
+ sp->id, ep->esb_stat);
+ }
+ print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
+ 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
+}
+
+/*
+ * Get LUN from CDB.
+ */
+static int ft_get_lun_for_cmd(struct ft_cmd *cmd, u8 *lunp)
+{
+ u64 lun;
+
+ lun = lunp[1];
+ switch (lunp[0] >> 6) {
+ case 0:
+ break;
+ case 1:
+ lun |= (lunp[0] & 0x3f) << 8;
+ break;
+ default:
+ return -1;
+ }
+ if (lun >= TRANSPORT_MAX_LUNS_PER_TPG)
+ return -1;
+ cmd->lun = lun;
+ return transport_get_lun_for_cmd(&cmd->se_cmd, NULL, lun);
+}
+
+static void ft_queue_cmd(struct ft_sess *sess, struct ft_cmd *cmd)
+{
+ struct se_queue_obj *qobj;
+ unsigned long flags;
+
+ qobj = &sess->tport->tpg->qobj;
+ spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+ list_add_tail(&cmd->se_req.qr_list, &qobj->qobj_list);
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+ atomic_inc(&qobj->queue_cnt);
+ wake_up_interruptible(&qobj->thread_wq);
+}
+
+static struct ft_cmd *ft_dequeue_cmd(struct se_queue_obj *qobj)
+{
+ unsigned long flags;
+ struct se_queue_req *qr;
+
+ spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+ if (list_empty(&qobj->qobj_list)) {
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+ return NULL;
+ }
+ qr = list_first_entry(&qobj->qobj_list, struct se_queue_req, qr_list);
+ list_del(&qr->qr_list);
+ atomic_dec(&qobj->queue_cnt);
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+ return container_of(qr, struct ft_cmd, se_req);
+}
+
+static void ft_free_cmd(struct ft_cmd *cmd)
+{
+ struct fc_frame *fp;
+ struct fc_lport *lport;
+
+ if (!cmd)
+ return;
+ fp = cmd->req_frame;
+ lport = fr_dev(fp);
+ if (fr_seq(fp))
+ lport->tt.seq_release(fr_seq(fp));
+ fc_frame_free(fp);
+ ft_sess_put(cmd->sess); /* undo get from lookup at recv */
+ kfree(cmd);
+}
+
+void ft_release_cmd(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+
+ ft_free_cmd(cmd);
+}
+
+void ft_check_stop_free(struct se_cmd *se_cmd)
+{
+ transport_generic_free_cmd(se_cmd, 0, 1, 0);
+}
+
+/*
+ * Send response.
+ */
+int ft_queue_status(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+ struct fc_frame *fp;
+ struct fcp_resp_with_ext *fcp;
+ struct fc_lport *lport;
+ struct fc_exch *ep;
+ size_t len;
+
+ ft_dump_cmd(cmd, __func__);
+ ep = fc_seq_exch(cmd->seq);
+ lport = ep->lp;
+ len = sizeof(*fcp) + se_cmd->scsi_sense_length;
+ fp = fc_frame_alloc(lport, len);
+ if (!fp) {
+ /* XXX shouldn't just drop it - requeue and retry? */
+ return 0;
+ }
+ fcp = fc_frame_payload_get(fp, len);
+ memset(fcp, 0, len);
+ fcp->resp.fr_status = se_cmd->scsi_status;
+
+ len = se_cmd->scsi_sense_length;
+ if (len) {
+ fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
+ fcp->ext.fr_sns_len = htonl(len);
+ memcpy((fcp + 1), se_cmd->sense_buffer, len);
+ }
+
+ /*
+ * Test underflow and overflow with one mask. Usually both are off.
+ * Bidirectional commands are not handled yet.
+ */
+ if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
+ if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
+ fcp->resp.fr_flags |= FCP_RESID_OVER;
+ else
+ fcp->resp.fr_flags |= FCP_RESID_UNDER;
+ fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
+ }
+
+ /*
+ * Send response.
+ */
+ cmd->seq = lport->tt.seq_start_next(cmd->seq);
+ fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
+ FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
+
+ lport->tt.seq_send(lport, cmd->seq, fp);
+ lport->tt.exch_done(cmd->seq);
+ return 0;
+}
+
+int ft_write_pending_status(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+
+ return cmd->write_data_len != se_cmd->data_length;
+}
+
+/*
+ * Send TX_RDY (transfer ready).
+ */
+int ft_write_pending(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+ struct fc_frame *fp;
+ struct fcp_txrdy *txrdy;
+ struct fc_lport *lport;
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ u32 f_ctl;
+
+ ft_dump_cmd(cmd, __func__);
+
+ ep = fc_seq_exch(cmd->seq);
+ lport = ep->lp;
+ fp = fc_frame_alloc(lport, sizeof(*txrdy));
+ if (!fp)
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+
+ txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
+ memset(txrdy, 0, sizeof(*txrdy));
+ txrdy->ft_burst_len = htonl(se_cmd->data_length);
+
+ cmd->seq = lport->tt.seq_start_next(cmd->seq);
+ fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
+ FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+ fh = fc_frame_header_get(fp);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+
+ /* Only if it is 'Exchange Responder' */
+ if (f_ctl & FC_FC_EX_CTX) {
+ /* Target is 'exchange responder' and sending XFER_READY
+ * to 'exchange initiator (initiator)'
+ */
+ if ((ep->xid <= lport->lro_xid) &&
+ (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
+ if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
+ /*
+ * Map se_mem list to scatterlist, so that
+ * DDP can be setup. DDP setup function require
+ * scatterlist. se_mem_list is internal to
+ * TCM/LIO target
+ */
+ transport_do_task_sg_chain(se_cmd);
+ cmd->sg = T_TASK(se_cmd)->t_tasks_sg_chained;
+ cmd->sg_cnt =
+ T_TASK(se_cmd)->t_tasks_sg_chained_no;
+ }
+ if (cmd->sg && lport->tt.ddp_setup(lport, ep->xid,
+ cmd->sg, cmd->sg_cnt))
+ cmd->was_ddp_setup = 1;
+ }
+ }
+ lport->tt.seq_send(lport, cmd->seq, fp);
+ return 0;
+}
+
+u32 ft_get_task_tag(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+
+ return fc_seq_exch(cmd->seq)->rxid;
+}
+
+int ft_get_cmd_state(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+
+ return cmd->state;
+}
+
+int ft_is_state_remove(struct se_cmd *se_cmd)
+{
+ return 0; /* XXX TBD */
+}
+
+void ft_new_cmd_failure(struct se_cmd *se_cmd)
+{
+ /* XXX TBD */
+ printk(KERN_INFO "%s: se_cmd %p\n", __func__, se_cmd);
+}
+
+/*
+ * FC sequence response handler for follow-on sequences (data) and aborts.
+ */
+static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct ft_cmd *cmd = arg;
+ struct fc_frame_header *fh;
+
+ if (IS_ERR(fp)) {
+ /* XXX need to find cmd if queued */
+ cmd->se_cmd.t_state = TRANSPORT_REMOVE;
+ cmd->seq = NULL;
+ transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
+ return;
+ }
+
+ fh = fc_frame_header_get(fp);
+
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_DD_SOL_DATA: /* write data */
+ ft_recv_write_data(cmd, fp);
+ break;
+ case FC_RCTL_DD_UNSOL_CTL: /* command */
+ case FC_RCTL_DD_SOL_CTL: /* transfer ready */
+ case FC_RCTL_DD_DATA_DESC: /* transfer ready */
+ default:
+ printk(KERN_INFO "%s: unhandled frame r_ctl %x\n",
+ __func__, fh->fh_r_ctl);
+ fc_frame_free(fp);
+ transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
+ break;
+ }
+}
+
+/*
+ * Send a FCP response including SCSI status and optional FCP rsp_code.
+ * status is SAM_STAT_GOOD (zero) iff code is valid.
+ * This is used in error cases, such as allocation failures.
+ */
+static void ft_send_resp_status(struct fc_lport *lport,
+ const struct fc_frame *rx_fp,
+ u32 status, enum fcp_resp_rsp_codes code)
+{
+ struct fc_frame *fp;
+ struct fc_seq *sp;
+ const struct fc_frame_header *fh;
+ size_t len;
+ struct fcp_resp_with_ext *fcp;
+ struct fcp_resp_rsp_info *info;
+
+ fh = fc_frame_header_get(rx_fp);
+ FT_IO_DBG("FCP error response: did %x oxid %x status %x code %x\n",
+ ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
+ len = sizeof(*fcp);
+ if (status == SAM_STAT_GOOD)
+ len += sizeof(*info);
+ fp = fc_frame_alloc(lport, len);
+ if (!fp)
+ return;
+ fcp = fc_frame_payload_get(fp, len);
+ memset(fcp, 0, len);
+ fcp->resp.fr_status = status;
+ if (status == SAM_STAT_GOOD) {
+ fcp->ext.fr_rsp_len = htonl(sizeof(*info));
+ fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
+ info = (struct fcp_resp_rsp_info *)(fcp + 1);
+ info->rsp_code = code;
+ }
+
+ fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
+ sp = fr_seq(fp);
+ if (sp)
+ lport->tt.seq_send(lport, sp, fp);
+ else
+ lport->tt.frame_send(lport, fp);
+}
+
+/*
+ * Send error or task management response.
+ * Always frees the cmd and associated state.
+ */
+static void ft_send_resp_code(struct ft_cmd *cmd, enum fcp_resp_rsp_codes code)
+{
+ ft_send_resp_status(cmd->sess->tport->lport,
+ cmd->req_frame, SAM_STAT_GOOD, code);
+ ft_free_cmd(cmd);
+}
+
+/*
+ * Handle Task Management Request.
+ */
+static void ft_send_tm(struct ft_cmd *cmd)
+{
+ struct se_tmr_req *tmr;
+ struct fcp_cmnd *fcp;
+ u8 tm_func;
+
+ fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
+
+ switch (fcp->fc_tm_flags) {
+ case FCP_TMF_LUN_RESET:
+ tm_func = TMR_LUN_RESET;
+ if (ft_get_lun_for_cmd(cmd, fcp->fc_lun) < 0) {
+ ft_dump_cmd(cmd, __func__);
+ transport_send_check_condition_and_sense(&cmd->se_cmd,
+ cmd->se_cmd.scsi_sense_reason, 0);
+ ft_sess_put(cmd->sess);
+ return;
+ }
+ break;
+ case FCP_TMF_TGT_RESET:
+ tm_func = TMR_TARGET_WARM_RESET;
+ break;
+ case FCP_TMF_CLR_TASK_SET:
+ tm_func = TMR_CLEAR_TASK_SET;
+ break;
+ case FCP_TMF_ABT_TASK_SET:
+ tm_func = TMR_ABORT_TASK_SET;
+ break;
+ case FCP_TMF_CLR_ACA:
+ tm_func = TMR_CLEAR_ACA;
+ break;
+ default:
+ /*
+ * FCP4r01 indicates having a combination of
+ * tm_flags set is invalid.
+ */
+ FT_TM_DBG("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
+ ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
+ return;
+ }
+
+ FT_TM_DBG("alloc tm cmd fn %d\n", tm_func);
+ tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func);
+ if (!tmr) {
+ FT_TM_DBG("alloc failed\n");
+ ft_send_resp_code(cmd, FCP_TMF_FAILED);
+ return;
+ }
+ cmd->se_cmd.se_tmr_req = tmr;
+ transport_generic_handle_tmr(&cmd->se_cmd);
+}
+
+/*
+ * Send status from completed task management request.
+ */
+int ft_queue_tm_resp(struct se_cmd *se_cmd)
+{
+ struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
+ struct se_tmr_req *tmr = se_cmd->se_tmr_req;
+ enum fcp_resp_rsp_codes code;
+
+ switch (tmr->response) {
+ case TMR_FUNCTION_COMPLETE:
+ code = FCP_TMF_CMPL;
+ break;
+ case TMR_LUN_DOES_NOT_EXIST:
+ code = FCP_TMF_INVALID_LUN;
+ break;
+ case TMR_FUNCTION_REJECTED:
+ code = FCP_TMF_REJECTED;
+ break;
+ case TMR_TASK_DOES_NOT_EXIST:
+ case TMR_TASK_STILL_ALLEGIANT:
+ case TMR_TASK_FAILOVER_NOT_SUPPORTED:
+ case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
+ case TMR_FUNCTION_AUTHORIZATION_FAILED:
+ default:
+ code = FCP_TMF_FAILED;
+ break;
+ }
+ FT_TM_DBG("tmr fn %d resp %d fcp code %d\n",
+ tmr->function, tmr->response, code);
+ ft_send_resp_code(cmd, code);
+ return 0;
+}
+
+/*
+ * Handle incoming FCP command.
+ */
+static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
+{
+ struct ft_cmd *cmd;
+ struct fc_lport *lport = sess->tport->lport;
+
+ cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
+ if (!cmd)
+ goto busy;
+ cmd->sess = sess;
+ cmd->seq = lport->tt.seq_assign(lport, fp);
+ if (!cmd->seq) {
+ kfree(cmd);
+ goto busy;
+ }
+ cmd->req_frame = fp; /* hold frame during cmd */
+ ft_queue_cmd(sess, cmd);
+ return;
+
+busy:
+ FT_IO_DBG("cmd or seq allocation failure - sending BUSY\n");
+ ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
+ fc_frame_free(fp);
+ ft_sess_put(sess); /* undo get from lookup */
+}
+
+
+/*
+ * Handle incoming FCP frame.
+ * Caller has verified that the frame is type FCP.
+ */
+void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_DD_UNSOL_CMD: /* command */
+ ft_recv_cmd(sess, fp);
+ break;
+ case FC_RCTL_DD_SOL_DATA: /* write data */
+ case FC_RCTL_DD_UNSOL_CTL:
+ case FC_RCTL_DD_SOL_CTL:
+ case FC_RCTL_DD_DATA_DESC: /* transfer ready */
+ case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
+ default:
+ printk(KERN_INFO "%s: unhandled frame r_ctl %x\n",
+ __func__, fh->fh_r_ctl);
+ fc_frame_free(fp);
+ ft_sess_put(sess); /* undo get from lookup */
+ break;
+ }
+}
+
+/*
+ * Send new command to target.
+ */
+static void ft_send_cmd(struct ft_cmd *cmd)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
+ struct se_cmd *se_cmd;
+ struct fcp_cmnd *fcp;
+ int data_dir;
+ u32 data_len;
+ int task_attr;
+ int ret;
+
+ fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
+ if (!fcp)
+ goto err;
+
+ if (fcp->fc_flags & FCP_CFL_LEN_MASK)
+ goto err; /* not handling longer CDBs yet */
+
+ if (fcp->fc_tm_flags) {
+ task_attr = FCP_PTA_SIMPLE;
+ data_dir = DMA_NONE;
+ data_len = 0;
+ } else {
+ switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
+ case 0:
+ data_dir = DMA_NONE;
+ break;
+ case FCP_CFL_RDDATA:
+ data_dir = DMA_FROM_DEVICE;
+ break;
+ case FCP_CFL_WRDATA:
+ data_dir = DMA_TO_DEVICE;
+ break;
+ case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
+ goto err; /* TBD not supported by tcm_fc yet */
+ }
+
+ /* FCP_PTA_ maps 1:1 to TASK_ATTR_ */
+ task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
+ data_len = ntohl(fcp->fc_dl);
+ cmd->cdb = fcp->fc_cdb;
+ }
+
+ se_cmd = &cmd->se_cmd;
+ /*
+ * Initialize struct se_cmd descriptor from target_core_mod
+ * infrastructure
+ */
+ transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
+ data_len, data_dir, task_attr,
+ &cmd->ft_sense_buffer[0]);
+ /*
+ * Check for FCP task management flags
+ */
+ if (fcp->fc_tm_flags) {
+ ft_send_tm(cmd);
+ return;
+ }
+
+ fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
+
+ ret = ft_get_lun_for_cmd(cmd, fcp->fc_lun);
+ if (ret < 0) {
+ ft_dump_cmd(cmd, __func__);
+ transport_send_check_condition_and_sense(&cmd->se_cmd,
+ cmd->se_cmd.scsi_sense_reason, 0);
+ return;
+ }
+
+ ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
+
+ FT_IO_DBG("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
+ ft_dump_cmd(cmd, __func__);
+
+ if (ret == -1) {
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+ transport_generic_free_cmd(se_cmd, 0, 1, 0);
+ return;
+ }
+ if (ret == -2) {
+ if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
+ ft_queue_status(se_cmd);
+ else
+ transport_send_check_condition_and_sense(se_cmd,
+ se_cmd->scsi_sense_reason, 0);
+ transport_generic_free_cmd(se_cmd, 0, 1, 0);
+ return;
+ }
+ transport_generic_handle_cdb(se_cmd);
+ return;
+
+err:
+ ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
+ return;
+}
+
+/*
+ * Handle request in the command thread.
+ */
+static void ft_exec_req(struct ft_cmd *cmd)
+{
+ FT_IO_DBG("cmd state %x\n", cmd->state);
+ switch (cmd->state) {
+ case FC_CMD_ST_NEW:
+ ft_send_cmd(cmd);
+ break;
+ default:
+ break;
+ }
+}
+
+/*
+ * Processing thread.
+ * Currently one thread per tpg.
+ */
+int ft_thread(void *arg)
+{
+ struct ft_tpg *tpg = arg;
+ struct se_queue_obj *qobj = &tpg->qobj;
+ struct ft_cmd *cmd;
+ int ret;
+
+ set_user_nice(current, -20);
+
+ while (!kthread_should_stop()) {
+ ret = wait_event_interruptible(qobj->thread_wq,
+ atomic_read(&qobj->queue_cnt) || kthread_should_stop());
+ if (ret < 0 || kthread_should_stop())
+ goto out;
+ cmd = ft_dequeue_cmd(qobj);
+ if (cmd)
+ ft_exec_req(cmd);
+ }
+
+out:
+ return 0;
+}
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