tcm_fc: Convert ft_send_work to use target_submit_cmd
This patch converts the main ft_send_work() I/O path to use target_submit_cmd() with a single se_cmd->cmd_kref reference that is released via the existing ft_check_stop_free() response path callback. It also makes ft_send_tm() use transport_init_se_cmd() and target_get_sess_cmd() to also use single se_cmd->cmd_kref reference. Cc: Christoph Hellwig <hch@lst.de> Cc: Kiran Patil <kiran.patil@intel.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -363,6 +363,11 @@ static void ft_send_tm(struct ft_cmd *cmd)
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struct ft_sess *sess;
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u8 tm_func;
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transport_init_se_cmd(&cmd->se_cmd, &ft_configfs->tf_ops,
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cmd->sess->se_sess, 0, DMA_NONE, 0,
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&cmd->ft_sense_buffer[0]);
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target_get_sess_cmd(cmd->sess->se_sess, &cmd->se_cmd, false);
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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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@ -416,7 +421,6 @@ static void ft_send_tm(struct ft_cmd *cmd)
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sess = cmd->sess;
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transport_send_check_condition_and_sense(&cmd->se_cmd,
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cmd->se_cmd.scsi_sense_reason, 0);
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transport_generic_free_cmd(&cmd->se_cmd, 0);
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ft_sess_put(sess);
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return;
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}
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@ -532,7 +536,6 @@ 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 se_cmd *se_cmd;
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struct fcp_cmnd *fcp;
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int data_dir = 0;
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u32 data_len;
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@ -587,15 +590,6 @@ static void ft_send_work(struct work_struct *work)
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data_len = ntohl(fcp->fc_dl);
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cmd->cdb = fcp->fc_cdb;
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}
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se_cmd = &cmd->se_cmd;
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/*
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* Initialize struct se_cmd descriptor from target_core_mod
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* infrastructure
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*/
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transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
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data_len, data_dir, task_attr,
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&cmd->ft_sense_buffer[0]);
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/*
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* Check for FCP task management flags
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*/
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@ -603,39 +597,20 @@ static void ft_send_work(struct work_struct *work)
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ft_send_tm(cmd);
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return;
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}
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fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
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cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
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ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
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/*
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* Use a single se_cmd->cmd_kref as we expect to release se_cmd
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* directly from ft_check_stop_free callback in response path.
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*/
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ret = target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, cmd->cdb,
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&cmd->ft_sense_buffer[0], cmd->lun, data_len,
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task_attr, data_dir, 0);
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pr_debug("r_ctl %x alloc target_submit_cmd %d\n", fh->fh_r_ctl, ret);
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if (ret < 0) {
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ft_dump_cmd(cmd, __func__);
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transport_send_check_condition_and_sense(&cmd->se_cmd,
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cmd->se_cmd.scsi_sense_reason, 0);
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return;
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}
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ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
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pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
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ft_dump_cmd(cmd, __func__);
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if (ret == -ENOMEM) {
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transport_send_check_condition_and_sense(se_cmd,
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TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
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transport_generic_free_cmd(se_cmd, 0);
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return;
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}
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if (ret == -EINVAL) {
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if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
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ft_queue_status(se_cmd);
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else
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transport_send_check_condition_and_sense(se_cmd,
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se_cmd->scsi_sense_reason, 0);
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transport_generic_free_cmd(se_cmd, 0);
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return;
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}
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transport_handle_cdb_direct(se_cmd);
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return;
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err:
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