1a61127c2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
23699d92aSKiran Patil /*
33699d92aSKiran Patil * Copyright (c) 2010 Cisco Systems, Inc.
43699d92aSKiran Patil */
53699d92aSKiran Patil
63699d92aSKiran Patil /* XXX TBD some includes may be extraneous */
73699d92aSKiran Patil
83699d92aSKiran Patil #include <linux/module.h>
93699d92aSKiran Patil #include <linux/moduleparam.h>
103699d92aSKiran Patil #include <linux/utsname.h>
113699d92aSKiran Patil #include <linux/init.h>
123699d92aSKiran Patil #include <linux/slab.h>
133699d92aSKiran Patil #include <linux/kthread.h>
143699d92aSKiran Patil #include <linux/types.h>
153699d92aSKiran Patil #include <linux/string.h>
163699d92aSKiran Patil #include <linux/configfs.h>
173699d92aSKiran Patil #include <linux/ctype.h>
183699d92aSKiran Patil #include <linux/hash.h>
193699d92aSKiran Patil #include <asm/unaligned.h>
2061db1802SNicholas Bellinger #include <scsi/scsi_tcq.h>
213699d92aSKiran Patil #include <scsi/libfc.h>
223699d92aSKiran Patil
233699d92aSKiran Patil #include <target/target_core_base.h>
24c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h>
253699d92aSKiran Patil
263699d92aSKiran Patil #include "tcm_fc.h"
273699d92aSKiran Patil
283699d92aSKiran Patil /*
293699d92aSKiran Patil * Dump cmd state for debugging.
303699d92aSKiran Patil */
_ft_dump_cmd(struct ft_cmd * cmd,const char * caller)311fa8f450SMark Rustad static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
323699d92aSKiran Patil {
333699d92aSKiran Patil struct fc_exch *ep;
343699d92aSKiran Patil struct fc_seq *sp;
353699d92aSKiran Patil struct se_cmd *se_cmd;
36ec98f782SAndy Grover struct scatterlist *sg;
37ec98f782SAndy Grover int count;
383699d92aSKiran Patil
393699d92aSKiran Patil se_cmd = &cmd->se_cmd;
4058fc73d1SChristoph Hellwig pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
4158fc73d1SChristoph Hellwig caller, cmd, cmd->sess, cmd->seq, se_cmd);
423699d92aSKiran Patil
436708bb27SAndy Grover pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
44ec98f782SAndy Grover caller, cmd, se_cmd->t_data_nents,
4505d1c7c0SAndy Grover se_cmd->data_length, se_cmd->se_cmd_flags);
465951146dSAndy Grover
47ec98f782SAndy Grover for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
486708bb27SAndy Grover pr_debug("%s: cmd %p sg %p page %p "
493699d92aSKiran Patil "len 0x%x off 0x%x\n",
50ec98f782SAndy Grover caller, cmd, sg,
51ec98f782SAndy Grover sg_page(sg), sg->length, sg->offset);
52ec98f782SAndy Grover
533699d92aSKiran Patil sp = cmd->seq;
543699d92aSKiran Patil if (sp) {
553699d92aSKiran Patil ep = fc_seq_exch(sp);
566708bb27SAndy Grover pr_debug("%s: cmd %p sid %x did %x "
573699d92aSKiran Patil "ox_id %x rx_id %x seq_id %x e_stat %x\n",
583699d92aSKiran Patil caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
593699d92aSKiran Patil sp->id, ep->esb_stat);
603699d92aSKiran Patil }
613699d92aSKiran Patil }
623699d92aSKiran Patil
ft_dump_cmd(struct ft_cmd * cmd,const char * caller)631fa8f450SMark Rustad void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
641fa8f450SMark Rustad {
651fa8f450SMark Rustad if (unlikely(ft_debug_logging))
661fa8f450SMark Rustad _ft_dump_cmd(cmd, caller);
671fa8f450SMark Rustad }
681fa8f450SMark Rustad
ft_free_cmd(struct ft_cmd * cmd)693699d92aSKiran Patil static void ft_free_cmd(struct ft_cmd *cmd)
703699d92aSKiran Patil {
713699d92aSKiran Patil struct fc_frame *fp;
72ed8ec8f7SNicholas Bellinger struct ft_sess *sess;
733699d92aSKiran Patil
743699d92aSKiran Patil if (!cmd)
753699d92aSKiran Patil return;
76ed8ec8f7SNicholas Bellinger sess = cmd->sess;
773699d92aSKiran Patil fp = cmd->req_frame;
783699d92aSKiran Patil if (fr_seq(fp))
799625cc48SHannes Reinecke fc_seq_release(fr_seq(fp));
803699d92aSKiran Patil fc_frame_free(fp);
8183c2b54bSMatthew Wilcox target_free_tag(sess->se_sess, &cmd->se_cmd);
82ed8ec8f7SNicholas Bellinger ft_sess_put(sess); /* undo get from lookup at recv */
833699d92aSKiran Patil }
843699d92aSKiran Patil
ft_release_cmd(struct se_cmd * se_cmd)853699d92aSKiran Patil void ft_release_cmd(struct se_cmd *se_cmd)
863699d92aSKiran Patil {
873699d92aSKiran Patil struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
883699d92aSKiran Patil
893699d92aSKiran Patil ft_free_cmd(cmd);
903699d92aSKiran Patil }
913699d92aSKiran Patil
ft_check_stop_free(struct se_cmd * se_cmd)9288dd9e26SNicholas Bellinger int ft_check_stop_free(struct se_cmd *se_cmd)
933699d92aSKiran Patil {
9491973cd6SNicholas Bellinger return transport_generic_free_cmd(se_cmd, 0);
953699d92aSKiran Patil }
963699d92aSKiran Patil
973699d92aSKiran Patil /*
983699d92aSKiran Patil * Send response.
993699d92aSKiran Patil */
ft_queue_status(struct se_cmd * se_cmd)1003699d92aSKiran Patil int ft_queue_status(struct se_cmd *se_cmd)
1013699d92aSKiran Patil {
1023699d92aSKiran Patil struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
1033699d92aSKiran Patil struct fc_frame *fp;
1043699d92aSKiran Patil struct fcp_resp_with_ext *fcp;
1053699d92aSKiran Patil struct fc_lport *lport;
1063699d92aSKiran Patil struct fc_exch *ep;
1073699d92aSKiran Patil size_t len;
1086dbe7f4eSNicholas Bellinger int rc;
1093699d92aSKiran Patil
110e1c40382SMark Rustad if (cmd->aborted)
111e1c40382SMark Rustad return 0;
1123699d92aSKiran Patil ft_dump_cmd(cmd, __func__);
1133699d92aSKiran Patil ep = fc_seq_exch(cmd->seq);
1143699d92aSKiran Patil lport = ep->lp;
1153699d92aSKiran Patil len = sizeof(*fcp) + se_cmd->scsi_sense_length;
1163699d92aSKiran Patil fp = fc_frame_alloc(lport, len);
1173699d92aSKiran Patil if (!fp) {
1186dbe7f4eSNicholas Bellinger se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
1196dbe7f4eSNicholas Bellinger return -ENOMEM;
1203699d92aSKiran Patil }
1216dbe7f4eSNicholas Bellinger
1223699d92aSKiran Patil fcp = fc_frame_payload_get(fp, len);
1233699d92aSKiran Patil memset(fcp, 0, len);
1243699d92aSKiran Patil fcp->resp.fr_status = se_cmd->scsi_status;
1253699d92aSKiran Patil
1263699d92aSKiran Patil len = se_cmd->scsi_sense_length;
1273699d92aSKiran Patil if (len) {
1283699d92aSKiran Patil fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
1293699d92aSKiran Patil fcp->ext.fr_sns_len = htonl(len);
1303699d92aSKiran Patil memcpy((fcp + 1), se_cmd->sense_buffer, len);
1313699d92aSKiran Patil }
1323699d92aSKiran Patil
1333699d92aSKiran Patil /*
1343699d92aSKiran Patil * Test underflow and overflow with one mask. Usually both are off.
1353699d92aSKiran Patil * Bidirectional commands are not handled yet.
1363699d92aSKiran Patil */
1373699d92aSKiran Patil if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
1383699d92aSKiran Patil if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
1393699d92aSKiran Patil fcp->resp.fr_flags |= FCP_RESID_OVER;
1403699d92aSKiran Patil else
1413699d92aSKiran Patil fcp->resp.fr_flags |= FCP_RESID_UNDER;
1423699d92aSKiran Patil fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
1433699d92aSKiran Patil }
1443699d92aSKiran Patil
1453699d92aSKiran Patil /*
1463699d92aSKiran Patil * Send response.
1473699d92aSKiran Patil */
148c6865b30SHannes Reinecke cmd->seq = fc_seq_start_next(cmd->seq);
1493699d92aSKiran Patil fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
1503699d92aSKiran Patil FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
1513699d92aSKiran Patil
1520cac937dSHannes Reinecke rc = fc_seq_send(lport, cmd->seq, fp);
1536dbe7f4eSNicholas Bellinger if (rc) {
1546dbe7f4eSNicholas Bellinger pr_info_ratelimited("%s: Failed to send response frame %p, "
1556dbe7f4eSNicholas Bellinger "xid <0x%x>\n", __func__, fp, ep->xid);
1566dbe7f4eSNicholas Bellinger /*
1576dbe7f4eSNicholas Bellinger * Generate a TASK_SET_FULL status to notify the initiator
1586dbe7f4eSNicholas Bellinger * to reduce it's queue_depth after the se_cmd response has
1596dbe7f4eSNicholas Bellinger * been re-queued by target-core.
1606dbe7f4eSNicholas Bellinger */
1616dbe7f4eSNicholas Bellinger se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
1626dbe7f4eSNicholas Bellinger return -ENOMEM;
1636dbe7f4eSNicholas Bellinger }
164768c72ccSHannes Reinecke fc_exch_done(cmd->seq);
16591973cd6SNicholas Bellinger /*
16691973cd6SNicholas Bellinger * Drop the extra ACK_KREF reference taken by target_submit_cmd()
16791973cd6SNicholas Bellinger * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
16891973cd6SNicholas Bellinger * final se_cmd->cmd_kref put.
16991973cd6SNicholas Bellinger */
17091973cd6SNicholas Bellinger target_put_sess_cmd(&cmd->se_cmd);
1713699d92aSKiran Patil return 0;
1723699d92aSKiran Patil }
1733699d92aSKiran Patil
1743699d92aSKiran Patil /*
1753699d92aSKiran Patil * Send TX_RDY (transfer ready).
1763699d92aSKiran Patil */
ft_write_pending(struct se_cmd * se_cmd)1773699d92aSKiran Patil int ft_write_pending(struct se_cmd *se_cmd)
1783699d92aSKiran Patil {
1793699d92aSKiran Patil struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
1803699d92aSKiran Patil struct fc_frame *fp;
1813699d92aSKiran Patil struct fcp_txrdy *txrdy;
1823699d92aSKiran Patil struct fc_lport *lport;
1833699d92aSKiran Patil struct fc_exch *ep;
1843699d92aSKiran Patil struct fc_frame_header *fh;
1853699d92aSKiran Patil u32 f_ctl;
1863699d92aSKiran Patil
1873699d92aSKiran Patil ft_dump_cmd(cmd, __func__);
1883699d92aSKiran Patil
189e1c40382SMark Rustad if (cmd->aborted)
190e1c40382SMark Rustad return 0;
1913699d92aSKiran Patil ep = fc_seq_exch(cmd->seq);
1923699d92aSKiran Patil lport = ep->lp;
1933699d92aSKiran Patil fp = fc_frame_alloc(lport, sizeof(*txrdy));
1943699d92aSKiran Patil if (!fp)
19503e98c9eSNicholas Bellinger return -ENOMEM; /* Signal QUEUE_FULL */
1963699d92aSKiran Patil
1973699d92aSKiran Patil txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
1983699d92aSKiran Patil memset(txrdy, 0, sizeof(*txrdy));
1993699d92aSKiran Patil txrdy->ft_burst_len = htonl(se_cmd->data_length);
2003699d92aSKiran Patil
201c6865b30SHannes Reinecke cmd->seq = fc_seq_start_next(cmd->seq);
2023699d92aSKiran Patil fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
2033699d92aSKiran Patil FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
2043699d92aSKiran Patil
2053699d92aSKiran Patil fh = fc_frame_header_get(fp);
2063699d92aSKiran Patil f_ctl = ntoh24(fh->fh_f_ctl);
2073699d92aSKiran Patil
2083699d92aSKiran Patil /* Only if it is 'Exchange Responder' */
2093699d92aSKiran Patil if (f_ctl & FC_FC_EX_CTX) {
2103699d92aSKiran Patil /* Target is 'exchange responder' and sending XFER_READY
2113699d92aSKiran Patil * to 'exchange initiator (initiator)'
2123699d92aSKiran Patil */
2133699d92aSKiran Patil if ((ep->xid <= lport->lro_xid) &&
2143699d92aSKiran Patil (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
21564f1db38SChristoph Hellwig if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
216e182d682SRoland Dreier lport->tt.ddp_target(lport, ep->xid,
217e182d682SRoland Dreier se_cmd->t_data_sg,
218e182d682SRoland Dreier se_cmd->t_data_nents))
2193699d92aSKiran Patil cmd->was_ddp_setup = 1;
2203699d92aSKiran Patil }
2213699d92aSKiran Patil }
2220cac937dSHannes Reinecke fc_seq_send(lport, cmd->seq, fp);
2233699d92aSKiran Patil return 0;
2243699d92aSKiran Patil }
2253699d92aSKiran Patil
2263699d92aSKiran Patil /*
2273699d92aSKiran Patil * FC sequence response handler for follow-on sequences (data) and aborts.
2283699d92aSKiran Patil */
ft_recv_seq(struct fc_seq * sp,struct fc_frame * fp,void * arg)2293699d92aSKiran Patil static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
2303699d92aSKiran Patil {
2313699d92aSKiran Patil struct ft_cmd *cmd = arg;
2323699d92aSKiran Patil struct fc_frame_header *fh;
2333699d92aSKiran Patil
2349d8c94e4SViresh Kumar if (IS_ERR(fp)) {
2353699d92aSKiran Patil /* XXX need to find cmd if queued */
2363699d92aSKiran Patil cmd->seq = NULL;
237e1c40382SMark Rustad cmd->aborted = true;
2383699d92aSKiran Patil return;
2393699d92aSKiran Patil }
2403699d92aSKiran Patil
2413699d92aSKiran Patil fh = fc_frame_header_get(fp);
2423699d92aSKiran Patil
2433699d92aSKiran Patil switch (fh->fh_r_ctl) {
2443699d92aSKiran Patil case FC_RCTL_DD_SOL_DATA: /* write data */
2453699d92aSKiran Patil ft_recv_write_data(cmd, fp);
2463699d92aSKiran Patil break;
2473699d92aSKiran Patil case FC_RCTL_DD_UNSOL_CTL: /* command */
2483699d92aSKiran Patil case FC_RCTL_DD_SOL_CTL: /* transfer ready */
2493699d92aSKiran Patil case FC_RCTL_DD_DATA_DESC: /* transfer ready */
2503699d92aSKiran Patil default:
2516708bb27SAndy Grover pr_debug("%s: unhandled frame r_ctl %x\n",
2523699d92aSKiran Patil __func__, fh->fh_r_ctl);
253dcd998ccSKiran Patil ft_invl_hw_context(cmd);
2543699d92aSKiran Patil fc_frame_free(fp);
25582f1c8a4SChristoph Hellwig transport_generic_free_cmd(&cmd->se_cmd, 0);
2563699d92aSKiran Patil break;
2573699d92aSKiran Patil }
2583699d92aSKiran Patil }
2593699d92aSKiran Patil
2603699d92aSKiran Patil /*
2613699d92aSKiran Patil * Send a FCP response including SCSI status and optional FCP rsp_code.
2623699d92aSKiran Patil * status is SAM_STAT_GOOD (zero) iff code is valid.
2633699d92aSKiran Patil * This is used in error cases, such as allocation failures.
2643699d92aSKiran Patil */
ft_send_resp_status(struct fc_lport * lport,const struct fc_frame * rx_fp,u32 status,enum fcp_resp_rsp_codes code)2653699d92aSKiran Patil static void ft_send_resp_status(struct fc_lport *lport,
2663699d92aSKiran Patil const struct fc_frame *rx_fp,
2673699d92aSKiran Patil u32 status, enum fcp_resp_rsp_codes code)
2683699d92aSKiran Patil {
2693699d92aSKiran Patil struct fc_frame *fp;
2703699d92aSKiran Patil struct fc_seq *sp;
2713699d92aSKiran Patil const struct fc_frame_header *fh;
2723699d92aSKiran Patil size_t len;
2733699d92aSKiran Patil struct fcp_resp_with_ext *fcp;
2743699d92aSKiran Patil struct fcp_resp_rsp_info *info;
2753699d92aSKiran Patil
2763699d92aSKiran Patil fh = fc_frame_header_get(rx_fp);
2776708bb27SAndy Grover pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
2783699d92aSKiran Patil ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
2793699d92aSKiran Patil len = sizeof(*fcp);
2803699d92aSKiran Patil if (status == SAM_STAT_GOOD)
2813699d92aSKiran Patil len += sizeof(*info);
2823699d92aSKiran Patil fp = fc_frame_alloc(lport, len);
2833699d92aSKiran Patil if (!fp)
2843699d92aSKiran Patil return;
2853699d92aSKiran Patil fcp = fc_frame_payload_get(fp, len);
2863699d92aSKiran Patil memset(fcp, 0, len);
2873699d92aSKiran Patil fcp->resp.fr_status = status;
2883699d92aSKiran Patil if (status == SAM_STAT_GOOD) {
2893699d92aSKiran Patil fcp->ext.fr_rsp_len = htonl(sizeof(*info));
2903699d92aSKiran Patil fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
2913699d92aSKiran Patil info = (struct fcp_resp_rsp_info *)(fcp + 1);
2923699d92aSKiran Patil info->rsp_code = code;
2933699d92aSKiran Patil }
2943699d92aSKiran Patil
2953699d92aSKiran Patil fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
2963699d92aSKiran Patil sp = fr_seq(fp);
297031ed4d5SNicholas Bellinger if (sp) {
2980cac937dSHannes Reinecke fc_seq_send(lport, sp, fp);
299768c72ccSHannes Reinecke fc_exch_done(sp);
300031ed4d5SNicholas Bellinger } else {
3013699d92aSKiran Patil lport->tt.frame_send(lport, fp);
3023699d92aSKiran Patil }
303031ed4d5SNicholas Bellinger }
3043699d92aSKiran Patil
3053699d92aSKiran Patil /*
3063699d92aSKiran Patil * Send error or task management response.
3073699d92aSKiran Patil */
ft_send_resp_code(struct ft_cmd * cmd,enum fcp_resp_rsp_codes code)308f2f7b09cSKiran Patil static void ft_send_resp_code(struct ft_cmd *cmd,
309f2f7b09cSKiran Patil enum fcp_resp_rsp_codes code)
3103699d92aSKiran Patil {
3113699d92aSKiran Patil ft_send_resp_status(cmd->sess->tport->lport,
3123699d92aSKiran Patil cmd->req_frame, SAM_STAT_GOOD, code);
313f2f7b09cSKiran Patil }
314f2f7b09cSKiran Patil
315f2f7b09cSKiran Patil
316f2f7b09cSKiran Patil /*
317f2f7b09cSKiran Patil * Send error or task management response.
318f2f7b09cSKiran Patil * Always frees the cmd and associated state.
319f2f7b09cSKiran Patil */
ft_send_resp_code_and_free(struct ft_cmd * cmd,enum fcp_resp_rsp_codes code)320f2f7b09cSKiran Patil static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
321f2f7b09cSKiran Patil enum fcp_resp_rsp_codes code)
322f2f7b09cSKiran Patil {
323f2f7b09cSKiran Patil ft_send_resp_code(cmd, code);
3243699d92aSKiran Patil ft_free_cmd(cmd);
3253699d92aSKiran Patil }
3263699d92aSKiran Patil
3273699d92aSKiran Patil /*
3283699d92aSKiran Patil * Handle Task Management Request.
3293699d92aSKiran Patil */
ft_send_tm(struct ft_cmd * cmd)3303699d92aSKiran Patil static void ft_send_tm(struct ft_cmd *cmd)
3313699d92aSKiran Patil {
3323699d92aSKiran Patil struct fcp_cmnd *fcp;
33300ad4c4eSNicholas Bellinger int rc;
3343699d92aSKiran Patil u8 tm_func;
3353699d92aSKiran Patil
3363699d92aSKiran Patil fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
3373699d92aSKiran Patil
3383699d92aSKiran Patil switch (fcp->fc_tm_flags) {
3393699d92aSKiran Patil case FCP_TMF_LUN_RESET:
3403699d92aSKiran Patil tm_func = TMR_LUN_RESET;
3413699d92aSKiran Patil break;
3423699d92aSKiran Patil case FCP_TMF_TGT_RESET:
3433699d92aSKiran Patil tm_func = TMR_TARGET_WARM_RESET;
3443699d92aSKiran Patil break;
3453699d92aSKiran Patil case FCP_TMF_CLR_TASK_SET:
3463699d92aSKiran Patil tm_func = TMR_CLEAR_TASK_SET;
3473699d92aSKiran Patil break;
3483699d92aSKiran Patil case FCP_TMF_ABT_TASK_SET:
3493699d92aSKiran Patil tm_func = TMR_ABORT_TASK_SET;
3503699d92aSKiran Patil break;
3513699d92aSKiran Patil case FCP_TMF_CLR_ACA:
3523699d92aSKiran Patil tm_func = TMR_CLEAR_ACA;
3533699d92aSKiran Patil break;
3543699d92aSKiran Patil default:
3553699d92aSKiran Patil /*
3563699d92aSKiran Patil * FCP4r01 indicates having a combination of
3573699d92aSKiran Patil * tm_flags set is invalid.
3583699d92aSKiran Patil */
3596708bb27SAndy Grover pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
360f2f7b09cSKiran Patil ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
3613699d92aSKiran Patil return;
3623699d92aSKiran Patil }
3633699d92aSKiran Patil
364c0974f89SNicholas Bellinger /* FIXME: Add referenced task tag for ABORT_TASK */
36500ad4c4eSNicholas Bellinger rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess,
36659dcb5ecSAndy Grover &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
36791973cd6SNicholas Bellinger cmd, tm_func, GFP_KERNEL, 0, TARGET_SCF_ACK_KREF);
36800ad4c4eSNicholas Bellinger if (rc < 0)
36900ad4c4eSNicholas Bellinger ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
3703699d92aSKiran Patil }
3713699d92aSKiran Patil
3723699d92aSKiran Patil /*
3733699d92aSKiran Patil * Send status from completed task management request.
3743699d92aSKiran Patil */
ft_queue_tm_resp(struct se_cmd * se_cmd)375b79fafacSJoern Engel void ft_queue_tm_resp(struct se_cmd *se_cmd)
3763699d92aSKiran Patil {
3773699d92aSKiran Patil struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
3783699d92aSKiran Patil struct se_tmr_req *tmr = se_cmd->se_tmr_req;
3793699d92aSKiran Patil enum fcp_resp_rsp_codes code;
3803699d92aSKiran Patil
381e1c40382SMark Rustad if (cmd->aborted)
382b79fafacSJoern Engel return;
3833699d92aSKiran Patil switch (tmr->response) {
3843699d92aSKiran Patil case TMR_FUNCTION_COMPLETE:
3853699d92aSKiran Patil code = FCP_TMF_CMPL;
3863699d92aSKiran Patil break;
3873699d92aSKiran Patil case TMR_LUN_DOES_NOT_EXIST:
3883699d92aSKiran Patil code = FCP_TMF_INVALID_LUN;
3893699d92aSKiran Patil break;
3903699d92aSKiran Patil case TMR_FUNCTION_REJECTED:
3913699d92aSKiran Patil code = FCP_TMF_REJECTED;
3923699d92aSKiran Patil break;
3933699d92aSKiran Patil case TMR_TASK_DOES_NOT_EXIST:
3943699d92aSKiran Patil case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3953699d92aSKiran Patil default:
3963699d92aSKiran Patil code = FCP_TMF_FAILED;
3973699d92aSKiran Patil break;
3983699d92aSKiran Patil }
3996708bb27SAndy Grover pr_debug("tmr fn %d resp %d fcp code %d\n",
4003699d92aSKiran Patil tmr->function, tmr->response, code);
4013699d92aSKiran Patil ft_send_resp_code(cmd, code);
40291973cd6SNicholas Bellinger /*
40391973cd6SNicholas Bellinger * Drop the extra ACK_KREF reference taken by target_submit_tmr()
40491973cd6SNicholas Bellinger * ahead of ft_check_stop_free() -> transport_generic_free_cmd()
40591973cd6SNicholas Bellinger * final se_cmd->cmd_kref put.
40691973cd6SNicholas Bellinger */
40791973cd6SNicholas Bellinger target_put_sess_cmd(&cmd->se_cmd);
4083699d92aSKiran Patil }
4093699d92aSKiran Patil
ft_aborted_task(struct se_cmd * se_cmd)410131e6abcSNicholas Bellinger void ft_aborted_task(struct se_cmd *se_cmd)
411131e6abcSNicholas Bellinger {
412131e6abcSNicholas Bellinger return;
413131e6abcSNicholas Bellinger }
414131e6abcSNicholas Bellinger
41558fc73d1SChristoph Hellwig static void ft_send_work(struct work_struct *work);
41658fc73d1SChristoph Hellwig
4173699d92aSKiran Patil /*
4183699d92aSKiran Patil * Handle incoming FCP command.
4193699d92aSKiran Patil */
ft_recv_cmd(struct ft_sess * sess,struct fc_frame * fp)4203699d92aSKiran Patil static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
4213699d92aSKiran Patil {
4223699d92aSKiran Patil struct ft_cmd *cmd;
4233699d92aSKiran Patil struct fc_lport *lport = sess->tport->lport;
4245f544cfaSNicholas Bellinger struct se_session *se_sess = sess->se_sess;
42510e9cbb6SMatthew Wilcox int tag, cpu;
4263699d92aSKiran Patil
42710e9cbb6SMatthew Wilcox tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
4285f544cfaSNicholas Bellinger if (tag < 0)
4293699d92aSKiran Patil goto busy;
4305f544cfaSNicholas Bellinger
4315f544cfaSNicholas Bellinger cmd = &((struct ft_cmd *)se_sess->sess_cmd_map)[tag];
4325f544cfaSNicholas Bellinger memset(cmd, 0, sizeof(struct ft_cmd));
4335f544cfaSNicholas Bellinger
4345f544cfaSNicholas Bellinger cmd->se_cmd.map_tag = tag;
43510e9cbb6SMatthew Wilcox cmd->se_cmd.map_cpu = cpu;
4363699d92aSKiran Patil cmd->sess = sess;
43796d564e2SHannes Reinecke cmd->seq = fc_seq_assign(lport, fp);
4383699d92aSKiran Patil if (!cmd->seq) {
43983c2b54bSMatthew Wilcox target_free_tag(se_sess, &cmd->se_cmd);
4403699d92aSKiran Patil goto busy;
4413699d92aSKiran Patil }
4423699d92aSKiran Patil cmd->req_frame = fp; /* hold frame during cmd */
44358fc73d1SChristoph Hellwig
44458fc73d1SChristoph Hellwig INIT_WORK(&cmd->work, ft_send_work);
44558fc73d1SChristoph Hellwig queue_work(sess->tport->tpg->workqueue, &cmd->work);
4463699d92aSKiran Patil return;
4473699d92aSKiran Patil
4483699d92aSKiran Patil busy:
4496708bb27SAndy Grover pr_debug("cmd or seq allocation failure - sending BUSY\n");
4503699d92aSKiran Patil ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
4513699d92aSKiran Patil fc_frame_free(fp);
4523699d92aSKiran Patil ft_sess_put(sess); /* undo get from lookup */
4533699d92aSKiran Patil }
4543699d92aSKiran Patil
4553699d92aSKiran Patil
4563699d92aSKiran Patil /*
4573699d92aSKiran Patil * Handle incoming FCP frame.
4583699d92aSKiran Patil * Caller has verified that the frame is type FCP.
4593699d92aSKiran Patil */
ft_recv_req(struct ft_sess * sess,struct fc_frame * fp)4603699d92aSKiran Patil void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
4613699d92aSKiran Patil {
4623699d92aSKiran Patil struct fc_frame_header *fh = fc_frame_header_get(fp);
4633699d92aSKiran Patil
4643699d92aSKiran Patil switch (fh->fh_r_ctl) {
4653699d92aSKiran Patil case FC_RCTL_DD_UNSOL_CMD: /* command */
4663699d92aSKiran Patil ft_recv_cmd(sess, fp);
4673699d92aSKiran Patil break;
4683699d92aSKiran Patil case FC_RCTL_DD_SOL_DATA: /* write data */
4693699d92aSKiran Patil case FC_RCTL_DD_UNSOL_CTL:
4703699d92aSKiran Patil case FC_RCTL_DD_SOL_CTL:
4713699d92aSKiran Patil case FC_RCTL_DD_DATA_DESC: /* transfer ready */
4723699d92aSKiran Patil case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
4733699d92aSKiran Patil default:
4746708bb27SAndy Grover pr_debug("%s: unhandled frame r_ctl %x\n",
4753699d92aSKiran Patil __func__, fh->fh_r_ctl);
4763699d92aSKiran Patil fc_frame_free(fp);
4773699d92aSKiran Patil ft_sess_put(sess); /* undo get from lookup */
4783699d92aSKiran Patil break;
4793699d92aSKiran Patil }
4803699d92aSKiran Patil }
4813699d92aSKiran Patil
4823699d92aSKiran Patil /*
4833699d92aSKiran Patil * Send new command to target.
4843699d92aSKiran Patil */
ft_send_work(struct work_struct * work)48558fc73d1SChristoph Hellwig static void ft_send_work(struct work_struct *work)
4863699d92aSKiran Patil {
48758fc73d1SChristoph Hellwig struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
4883699d92aSKiran Patil struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
4893699d92aSKiran Patil struct fcp_cmnd *fcp;
49058fc73d1SChristoph Hellwig int data_dir = 0;
4913699d92aSKiran Patil int task_attr;
4923699d92aSKiran Patil
4933699d92aSKiran Patil fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
4943699d92aSKiran Patil if (!fcp)
4953699d92aSKiran Patil goto err;
4963699d92aSKiran Patil
4973699d92aSKiran Patil if (fcp->fc_flags & FCP_CFL_LEN_MASK)
4983699d92aSKiran Patil goto err; /* not handling longer CDBs yet */
4993699d92aSKiran Patil
5000dccb69dSAndy Grover /*
5010dccb69dSAndy Grover * Check for FCP task management flags
5020dccb69dSAndy Grover */
5033699d92aSKiran Patil if (fcp->fc_tm_flags) {
5040dccb69dSAndy Grover ft_send_tm(cmd);
5050dccb69dSAndy Grover return;
5060dccb69dSAndy Grover }
5070dccb69dSAndy Grover
5083699d92aSKiran Patil switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
5093699d92aSKiran Patil case 0:
5103699d92aSKiran Patil data_dir = DMA_NONE;
5113699d92aSKiran Patil break;
5123699d92aSKiran Patil case FCP_CFL_RDDATA:
5133699d92aSKiran Patil data_dir = DMA_FROM_DEVICE;
5143699d92aSKiran Patil break;
5153699d92aSKiran Patil case FCP_CFL_WRDATA:
5163699d92aSKiran Patil data_dir = DMA_TO_DEVICE;
5173699d92aSKiran Patil break;
5183699d92aSKiran Patil case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
5193699d92aSKiran Patil goto err; /* TBD not supported by tcm_fc yet */
5203699d92aSKiran Patil }
52161db1802SNicholas Bellinger /*
52261db1802SNicholas Bellinger * Locate the SAM Task Attr from fc_pri_ta
52361db1802SNicholas Bellinger */
52461db1802SNicholas Bellinger switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
52561db1802SNicholas Bellinger case FCP_PTA_HEADQ:
52668d81f40SChristoph Hellwig task_attr = TCM_HEAD_TAG;
52761db1802SNicholas Bellinger break;
52861db1802SNicholas Bellinger case FCP_PTA_ORDERED:
52968d81f40SChristoph Hellwig task_attr = TCM_ORDERED_TAG;
53061db1802SNicholas Bellinger break;
53161db1802SNicholas Bellinger case FCP_PTA_ACA:
53268d81f40SChristoph Hellwig task_attr = TCM_ACA_TAG;
53361db1802SNicholas Bellinger break;
534df561f66SGustavo A. R. Silva case FCP_PTA_SIMPLE:
53561db1802SNicholas Bellinger default:
53668d81f40SChristoph Hellwig task_attr = TCM_SIMPLE_TAG;
53761db1802SNicholas Bellinger }
5383699d92aSKiran Patil
539f1d61e6eSHannes Reinecke fc_seq_set_resp(cmd->seq, ft_recv_seq, cmd);
540649ee054SBart Van Assche cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid;
54147edc84fSMike Christie
5424355a911SNicholas Bellinger /*
5434355a911SNicholas Bellinger * Use a single se_cmd->cmd_kref as we expect to release se_cmd
5444355a911SNicholas Bellinger * directly from ft_check_stop_free callback in response path.
5454355a911SNicholas Bellinger */
54647edc84fSMike Christie if (target_init_cmd(&cmd->se_cmd, cmd->sess->se_sess,
54747edc84fSMike Christie &cmd->ft_sense_buffer[0],
54847edc84fSMike Christie scsilun_to_int(&fcp->fc_lun), ntohl(fcp->fc_dl),
54947edc84fSMike Christie task_attr, data_dir, TARGET_SCF_ACK_KREF))
550d6dfc868SRoland Dreier goto err;
551d6dfc868SRoland Dreier
55247edc84fSMike Christie if (target_submit_prep(&cmd->se_cmd, fcp->fc_cdb, NULL, 0, NULL, 0,
553*08694199SMike Christie NULL, 0, GFP_KERNEL))
55447edc84fSMike Christie return;
55547edc84fSMike Christie
55647edc84fSMike Christie target_submit(&cmd->se_cmd);
557b04bf583SHannes Reinecke pr_debug("r_ctl %x target_submit_cmd %p\n", fh->fh_r_ctl, cmd);
5583699d92aSKiran Patil return;
5593699d92aSKiran Patil
5603699d92aSKiran Patil err:
561f2f7b09cSKiran Patil ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
5623699d92aSKiran Patil }
563