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567 lines
14 KiB
567 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2010 Cisco Systems, Inc. |
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*/ |
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|
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/* XXX TBD some includes may be extraneous */ |
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|
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/utsname.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/kthread.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/configfs.h> |
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#include <linux/ctype.h> |
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#include <linux/hash.h> |
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#include <asm/unaligned.h> |
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#include <scsi/scsi_tcq.h> |
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#include <scsi/libfc.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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#include "tcm_fc.h" |
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/* |
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* Dump cmd state for debugging. |
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*/ |
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static void _ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
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{ |
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struct fc_exch *ep; |
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struct fc_seq *sp; |
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struct se_cmd *se_cmd; |
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struct scatterlist *sg; |
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int count; |
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se_cmd = &cmd->se_cmd; |
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pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n", |
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caller, cmd, cmd->sess, cmd->seq, se_cmd); |
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|
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pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n", |
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caller, cmd, se_cmd->t_data_nents, |
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se_cmd->data_length, se_cmd->se_cmd_flags); |
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for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count) |
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pr_debug("%s: cmd %p sg %p page %p " |
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"len 0x%x off 0x%x\n", |
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caller, cmd, sg, |
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sg_page(sg), sg->length, sg->offset); |
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sp = cmd->seq; |
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if (sp) { |
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ep = fc_seq_exch(sp); |
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pr_debug("%s: cmd %p sid %x did %x " |
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"ox_id %x rx_id %x seq_id %x e_stat %x\n", |
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caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid, |
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sp->id, ep->esb_stat); |
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} |
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} |
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void ft_dump_cmd(struct ft_cmd *cmd, const char *caller) |
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{ |
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if (unlikely(ft_debug_logging)) |
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_ft_dump_cmd(cmd, caller); |
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} |
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static void ft_free_cmd(struct ft_cmd *cmd) |
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{ |
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struct fc_frame *fp; |
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struct ft_sess *sess; |
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if (!cmd) |
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return; |
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sess = cmd->sess; |
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fp = cmd->req_frame; |
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if (fr_seq(fp)) |
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fc_seq_release(fr_seq(fp)); |
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fc_frame_free(fp); |
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target_free_tag(sess->se_sess, &cmd->se_cmd); |
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ft_sess_put(sess); /* undo get from lookup at recv */ |
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} |
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void ft_release_cmd(struct se_cmd *se_cmd) |
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{ |
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
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ft_free_cmd(cmd); |
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} |
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int ft_check_stop_free(struct se_cmd *se_cmd) |
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{ |
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return transport_generic_free_cmd(se_cmd, 0); |
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} |
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/* |
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* Send response. |
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*/ |
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int ft_queue_status(struct se_cmd *se_cmd) |
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{ |
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
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struct fc_frame *fp; |
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struct fcp_resp_with_ext *fcp; |
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struct fc_lport *lport; |
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struct fc_exch *ep; |
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size_t len; |
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int rc; |
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if (cmd->aborted) |
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return 0; |
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ft_dump_cmd(cmd, __func__); |
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ep = fc_seq_exch(cmd->seq); |
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lport = ep->lp; |
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len = sizeof(*fcp) + se_cmd->scsi_sense_length; |
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fp = fc_frame_alloc(lport, len); |
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if (!fp) { |
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se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; |
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return -ENOMEM; |
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} |
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fcp = fc_frame_payload_get(fp, len); |
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memset(fcp, 0, len); |
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fcp->resp.fr_status = se_cmd->scsi_status; |
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len = se_cmd->scsi_sense_length; |
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if (len) { |
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fcp->resp.fr_flags |= FCP_SNS_LEN_VAL; |
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fcp->ext.fr_sns_len = htonl(len); |
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memcpy((fcp + 1), se_cmd->sense_buffer, len); |
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} |
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/* |
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* Test underflow and overflow with one mask. Usually both are off. |
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* Bidirectional commands are not handled yet. |
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*/ |
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if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) { |
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if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) |
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fcp->resp.fr_flags |= FCP_RESID_OVER; |
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else |
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fcp->resp.fr_flags |= FCP_RESID_UNDER; |
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fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count); |
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} |
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/* |
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* Send response. |
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*/ |
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cmd->seq = fc_seq_start_next(cmd->seq); |
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fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP, |
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FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0); |
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rc = fc_seq_send(lport, cmd->seq, fp); |
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if (rc) { |
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pr_info_ratelimited("%s: Failed to send response frame %p, " |
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"xid <0x%x>\n", __func__, fp, ep->xid); |
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/* |
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* Generate a TASK_SET_FULL status to notify the initiator |
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* to reduce it's queue_depth after the se_cmd response has |
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* been re-queued by target-core. |
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*/ |
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se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL; |
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return -ENOMEM; |
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} |
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fc_exch_done(cmd->seq); |
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/* |
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* Drop the extra ACK_KREF reference taken by target_submit_cmd() |
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* ahead of ft_check_stop_free() -> transport_generic_free_cmd() |
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* final se_cmd->cmd_kref put. |
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*/ |
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target_put_sess_cmd(&cmd->se_cmd); |
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return 0; |
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} |
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/* |
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* Send TX_RDY (transfer ready). |
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*/ |
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int ft_write_pending(struct se_cmd *se_cmd) |
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{ |
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
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struct fc_frame *fp; |
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struct fcp_txrdy *txrdy; |
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struct fc_lport *lport; |
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struct fc_exch *ep; |
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struct fc_frame_header *fh; |
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u32 f_ctl; |
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ft_dump_cmd(cmd, __func__); |
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if (cmd->aborted) |
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return 0; |
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ep = fc_seq_exch(cmd->seq); |
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lport = ep->lp; |
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fp = fc_frame_alloc(lport, sizeof(*txrdy)); |
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if (!fp) |
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return -ENOMEM; /* Signal QUEUE_FULL */ |
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txrdy = fc_frame_payload_get(fp, sizeof(*txrdy)); |
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memset(txrdy, 0, sizeof(*txrdy)); |
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txrdy->ft_burst_len = htonl(se_cmd->data_length); |
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cmd->seq = fc_seq_start_next(cmd->seq); |
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fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP, |
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FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
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fh = fc_frame_header_get(fp); |
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f_ctl = ntoh24(fh->fh_f_ctl); |
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/* Only if it is 'Exchange Responder' */ |
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if (f_ctl & FC_FC_EX_CTX) { |
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/* Target is 'exchange responder' and sending XFER_READY |
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* to 'exchange initiator (initiator)' |
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*/ |
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if ((ep->xid <= lport->lro_xid) && |
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(fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) { |
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if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && |
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lport->tt.ddp_target(lport, ep->xid, |
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se_cmd->t_data_sg, |
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se_cmd->t_data_nents)) |
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cmd->was_ddp_setup = 1; |
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} |
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} |
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fc_seq_send(lport, cmd->seq, fp); |
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return 0; |
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} |
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int ft_get_cmd_state(struct se_cmd *se_cmd) |
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{ |
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return 0; |
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} |
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/* |
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* FC sequence response handler for follow-on sequences (data) and aborts. |
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*/ |
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static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg) |
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{ |
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struct ft_cmd *cmd = arg; |
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struct fc_frame_header *fh; |
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if (IS_ERR(fp)) { |
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/* XXX need to find cmd if queued */ |
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cmd->seq = NULL; |
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cmd->aborted = true; |
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return; |
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} |
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fh = fc_frame_header_get(fp); |
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switch (fh->fh_r_ctl) { |
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case FC_RCTL_DD_SOL_DATA: /* write data */ |
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ft_recv_write_data(cmd, fp); |
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break; |
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case FC_RCTL_DD_UNSOL_CTL: /* command */ |
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case FC_RCTL_DD_SOL_CTL: /* transfer ready */ |
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case FC_RCTL_DD_DATA_DESC: /* transfer ready */ |
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default: |
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pr_debug("%s: unhandled frame r_ctl %x\n", |
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__func__, fh->fh_r_ctl); |
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ft_invl_hw_context(cmd); |
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fc_frame_free(fp); |
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transport_generic_free_cmd(&cmd->se_cmd, 0); |
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break; |
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} |
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} |
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/* |
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* Send a FCP response including SCSI status and optional FCP rsp_code. |
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* status is SAM_STAT_GOOD (zero) iff code is valid. |
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* This is used in error cases, such as allocation failures. |
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*/ |
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static void ft_send_resp_status(struct fc_lport *lport, |
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const struct fc_frame *rx_fp, |
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u32 status, enum fcp_resp_rsp_codes code) |
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{ |
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struct fc_frame *fp; |
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struct fc_seq *sp; |
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const struct fc_frame_header *fh; |
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size_t len; |
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struct fcp_resp_with_ext *fcp; |
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struct fcp_resp_rsp_info *info; |
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fh = fc_frame_header_get(rx_fp); |
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pr_debug("FCP error response: did %x oxid %x status %x code %x\n", |
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ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code); |
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len = sizeof(*fcp); |
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if (status == SAM_STAT_GOOD) |
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len += sizeof(*info); |
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fp = fc_frame_alloc(lport, len); |
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if (!fp) |
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return; |
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fcp = fc_frame_payload_get(fp, len); |
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memset(fcp, 0, len); |
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fcp->resp.fr_status = status; |
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if (status == SAM_STAT_GOOD) { |
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fcp->ext.fr_rsp_len = htonl(sizeof(*info)); |
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fcp->resp.fr_flags |= FCP_RSP_LEN_VAL; |
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info = (struct fcp_resp_rsp_info *)(fcp + 1); |
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info->rsp_code = code; |
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} |
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fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0); |
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sp = fr_seq(fp); |
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if (sp) { |
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fc_seq_send(lport, sp, fp); |
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fc_exch_done(sp); |
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} else { |
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lport->tt.frame_send(lport, fp); |
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} |
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} |
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/* |
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* Send error or task management response. |
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*/ |
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static void ft_send_resp_code(struct ft_cmd *cmd, |
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enum fcp_resp_rsp_codes code) |
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{ |
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ft_send_resp_status(cmd->sess->tport->lport, |
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cmd->req_frame, SAM_STAT_GOOD, code); |
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} |
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/* |
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* Send error or task management response. |
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* Always frees the cmd and associated state. |
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*/ |
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static void ft_send_resp_code_and_free(struct ft_cmd *cmd, |
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enum fcp_resp_rsp_codes code) |
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{ |
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ft_send_resp_code(cmd, code); |
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ft_free_cmd(cmd); |
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} |
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/* |
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* Handle Task Management Request. |
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*/ |
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static void ft_send_tm(struct ft_cmd *cmd) |
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{ |
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struct fcp_cmnd *fcp; |
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int rc; |
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u8 tm_func; |
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fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); |
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switch (fcp->fc_tm_flags) { |
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case FCP_TMF_LUN_RESET: |
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tm_func = TMR_LUN_RESET; |
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break; |
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case FCP_TMF_TGT_RESET: |
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tm_func = TMR_TARGET_WARM_RESET; |
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break; |
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case FCP_TMF_CLR_TASK_SET: |
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tm_func = TMR_CLEAR_TASK_SET; |
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break; |
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case FCP_TMF_ABT_TASK_SET: |
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tm_func = TMR_ABORT_TASK_SET; |
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break; |
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case FCP_TMF_CLR_ACA: |
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tm_func = TMR_CLEAR_ACA; |
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break; |
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default: |
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/* |
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* FCP4r01 indicates having a combination of |
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* tm_flags set is invalid. |
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*/ |
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pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags); |
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ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
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return; |
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} |
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/* FIXME: Add referenced task tag for ABORT_TASK */ |
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rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess, |
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&cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun), |
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cmd, tm_func, GFP_KERNEL, 0, TARGET_SCF_ACK_KREF); |
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if (rc < 0) |
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ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED); |
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} |
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/* |
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* Send status from completed task management request. |
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*/ |
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void ft_queue_tm_resp(struct se_cmd *se_cmd) |
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{ |
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); |
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struct se_tmr_req *tmr = se_cmd->se_tmr_req; |
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enum fcp_resp_rsp_codes code; |
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if (cmd->aborted) |
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return; |
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switch (tmr->response) { |
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case TMR_FUNCTION_COMPLETE: |
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code = FCP_TMF_CMPL; |
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break; |
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case TMR_LUN_DOES_NOT_EXIST: |
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code = FCP_TMF_INVALID_LUN; |
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break; |
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case TMR_FUNCTION_REJECTED: |
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code = FCP_TMF_REJECTED; |
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break; |
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case TMR_TASK_DOES_NOT_EXIST: |
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case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: |
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default: |
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code = FCP_TMF_FAILED; |
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break; |
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} |
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pr_debug("tmr fn %d resp %d fcp code %d\n", |
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tmr->function, tmr->response, code); |
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ft_send_resp_code(cmd, code); |
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/* |
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* Drop the extra ACK_KREF reference taken by target_submit_tmr() |
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* ahead of ft_check_stop_free() -> transport_generic_free_cmd() |
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* final se_cmd->cmd_kref put. |
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*/ |
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target_put_sess_cmd(&cmd->se_cmd); |
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} |
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void ft_aborted_task(struct se_cmd *se_cmd) |
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{ |
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return; |
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} |
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static void ft_send_work(struct work_struct *work); |
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|
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/* |
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* Handle incoming FCP command. |
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*/ |
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static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp) |
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{ |
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struct ft_cmd *cmd; |
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struct fc_lport *lport = sess->tport->lport; |
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struct se_session *se_sess = sess->se_sess; |
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int tag, cpu; |
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tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
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if (tag < 0) |
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goto busy; |
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cmd = &((struct ft_cmd *)se_sess->sess_cmd_map)[tag]; |
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memset(cmd, 0, sizeof(struct ft_cmd)); |
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|
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cmd->se_cmd.map_tag = tag; |
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cmd->se_cmd.map_cpu = cpu; |
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cmd->sess = sess; |
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cmd->seq = fc_seq_assign(lport, fp); |
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if (!cmd->seq) { |
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target_free_tag(se_sess, &cmd->se_cmd); |
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goto busy; |
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} |
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cmd->req_frame = fp; /* hold frame during cmd */ |
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|
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INIT_WORK(&cmd->work, ft_send_work); |
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queue_work(sess->tport->tpg->workqueue, &cmd->work); |
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return; |
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busy: |
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pr_debug("cmd or seq allocation failure - sending BUSY\n"); |
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ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0); |
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fc_frame_free(fp); |
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ft_sess_put(sess); /* undo get from lookup */ |
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} |
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|
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/* |
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* Handle incoming FCP frame. |
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* Caller has verified that the frame is type FCP. |
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*/ |
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void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp) |
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{ |
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struct fc_frame_header *fh = fc_frame_header_get(fp); |
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|
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switch (fh->fh_r_ctl) { |
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case FC_RCTL_DD_UNSOL_CMD: /* command */ |
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ft_recv_cmd(sess, fp); |
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break; |
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case FC_RCTL_DD_SOL_DATA: /* write data */ |
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case FC_RCTL_DD_UNSOL_CTL: |
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case FC_RCTL_DD_SOL_CTL: |
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case FC_RCTL_DD_DATA_DESC: /* transfer ready */ |
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case FC_RCTL_ELS4_REQ: /* SRR, perhaps */ |
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default: |
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pr_debug("%s: unhandled frame r_ctl %x\n", |
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__func__, fh->fh_r_ctl); |
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fc_frame_free(fp); |
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ft_sess_put(sess); /* undo get from lookup */ |
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break; |
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} |
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} |
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|
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/* |
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* Send new command to target. |
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*/ |
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static void ft_send_work(struct work_struct *work) |
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{ |
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struct ft_cmd *cmd = container_of(work, struct ft_cmd, work); |
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struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame); |
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struct fcp_cmnd *fcp; |
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int data_dir = 0; |
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int task_attr; |
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|
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fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp)); |
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if (!fcp) |
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goto err; |
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|
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if (fcp->fc_flags & FCP_CFL_LEN_MASK) |
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goto err; /* not handling longer CDBs yet */ |
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|
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/* |
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* Check for FCP task management flags |
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*/ |
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if (fcp->fc_tm_flags) { |
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ft_send_tm(cmd); |
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return; |
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} |
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|
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switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) { |
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case 0: |
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data_dir = DMA_NONE; |
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break; |
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case FCP_CFL_RDDATA: |
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data_dir = DMA_FROM_DEVICE; |
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break; |
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case FCP_CFL_WRDATA: |
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data_dir = DMA_TO_DEVICE; |
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break; |
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case FCP_CFL_WRDATA | FCP_CFL_RDDATA: |
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goto err; /* TBD not supported by tcm_fc yet */ |
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} |
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/* |
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* Locate the SAM Task Attr from fc_pri_ta |
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*/ |
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switch (fcp->fc_pri_ta & FCP_PTA_MASK) { |
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case FCP_PTA_HEADQ: |
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task_attr = TCM_HEAD_TAG; |
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break; |
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case FCP_PTA_ORDERED: |
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task_attr = TCM_ORDERED_TAG; |
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break; |
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case FCP_PTA_ACA: |
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task_attr = TCM_ACA_TAG; |
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break; |
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case FCP_PTA_SIMPLE: |
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default: |
|
task_attr = TCM_SIMPLE_TAG; |
|
} |
|
|
|
fc_seq_set_resp(cmd->seq, ft_recv_seq, cmd); |
|
cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid; |
|
|
|
/* |
|
* Use a single se_cmd->cmd_kref as we expect to release se_cmd |
|
* directly from ft_check_stop_free callback in response path. |
|
*/ |
|
if (target_init_cmd(&cmd->se_cmd, cmd->sess->se_sess, |
|
&cmd->ft_sense_buffer[0], |
|
scsilun_to_int(&fcp->fc_lun), ntohl(fcp->fc_dl), |
|
task_attr, data_dir, TARGET_SCF_ACK_KREF)) |
|
goto err; |
|
|
|
if (target_submit_prep(&cmd->se_cmd, fcp->fc_cdb, NULL, 0, NULL, 0, |
|
NULL, 0, GFP_KERNEL)) |
|
return; |
|
|
|
target_submit(&cmd->se_cmd); |
|
pr_debug("r_ctl %x target_submit_cmd %p\n", fh->fh_r_ctl, cmd); |
|
return; |
|
|
|
err: |
|
ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID); |
|
}
|
|
|