[SCSI] libiscsi: prepare libiscsi for new offload engines by modifying unsol data code
cxgb3i offloads data transfers. It does not offload the entire scsi/iscsi procssing like qla4xxx and it does not offload the iscsi sequence processing like how bnx2i does. cxgb3i relies on iscsi_tcp for the seqeunce handling so this changes how we transfer unsolicitied data by adding a common r2t struct and helpers. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie
James Bottomley
Родитель
63c62f1cb9
Коммит
577577da6d
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@ -88,34 +88,47 @@ iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
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}
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EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
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void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *task,
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struct iscsi_data *hdr)
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/**
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* iscsi_prep_data_out_pdu - initialize Data-Out
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* @task: scsi command task
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* @r2t: R2T info
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* @hdr: iscsi data in pdu
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*
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* Notes:
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* Initialize Data-Out within this R2T sequence and finds
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* proper data_offset within this SCSI command.
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*
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* This function is called with connection lock taken.
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**/
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void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
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struct iscsi_data *hdr)
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{
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struct iscsi_conn *conn = task->conn;
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unsigned int left = r2t->data_length - r2t->sent;
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task->hdr_len = sizeof(struct iscsi_data);
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memset(hdr, 0, sizeof(struct iscsi_data));
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hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
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hdr->datasn = cpu_to_be32(task->unsol_datasn);
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task->unsol_datasn++;
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hdr->ttt = r2t->ttt;
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hdr->datasn = cpu_to_be32(r2t->datasn);
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r2t->datasn++;
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hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
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memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
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hdr->itt = task->hdr->itt;
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hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
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hdr->offset = cpu_to_be32(task->unsol_offset);
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if (task->unsol_count > conn->max_xmit_dlength) {
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memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
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hdr->itt = task->hdr_itt;
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hdr->exp_statsn = r2t->exp_statsn;
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hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
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if (left > conn->max_xmit_dlength) {
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hton24(hdr->dlength, conn->max_xmit_dlength);
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task->data_count = conn->max_xmit_dlength;
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task->unsol_offset += task->data_count;
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r2t->data_count = conn->max_xmit_dlength;
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hdr->flags = 0;
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} else {
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hton24(hdr->dlength, task->unsol_count);
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task->data_count = task->unsol_count;
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hton24(hdr->dlength, left);
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r2t->data_count = left;
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hdr->flags = ISCSI_FLAG_CMD_FINAL;
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}
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conn->dataout_pdus_cnt++;
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}
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EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
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EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
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static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
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{
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@ -206,11 +219,17 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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{
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struct iscsi_conn *conn = task->conn;
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struct iscsi_session *session = conn->session;
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struct iscsi_cmd *hdr = task->hdr;
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struct scsi_cmnd *sc = task->sc;
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struct iscsi_cmd *hdr;
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unsigned hdrlength, cmd_len;
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int rc;
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rc = conn->session->tt->alloc_pdu(task);
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if (rc)
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return rc;
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hdr = (struct iscsi_cmd *) task->hdr;
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memset(hdr, 0, sizeof(*hdr));
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task->hdr_len = 0;
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rc = iscsi_add_hdr(task, sizeof(*hdr));
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if (rc)
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@ -218,8 +237,9 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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hdr->opcode = ISCSI_OP_SCSI_CMD;
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hdr->flags = ISCSI_ATTR_SIMPLE;
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int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
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hdr->itt = build_itt(task->itt, session->age);
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hdr->cmdsn = cpu_to_be32(session->cmdsn);
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memcpy(task->lun, hdr->lun, sizeof(task->lun));
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hdr->itt = task->hdr_itt = build_itt(task->itt, session->age);
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hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
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session->cmdsn++;
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hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
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cmd_len = sc->cmd_len;
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@ -242,6 +262,8 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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}
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if (sc->sc_data_direction == DMA_TO_DEVICE) {
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unsigned out_len = scsi_out(sc)->length;
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struct iscsi_r2t_info *r2t = &task->unsol_r2t;
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hdr->data_length = cpu_to_be32(out_len);
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hdr->flags |= ISCSI_FLAG_CMD_WRITE;
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/*
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@ -254,13 +276,11 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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* without R2T ack right after
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* immediate data
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*
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* r2t_data_count bytes to be sent via R2T ack's
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* r2t data_length bytes to be sent via R2T ack's
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*
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* pad_count bytes to be sent as zero-padding
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*/
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task->unsol_count = 0;
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task->unsol_offset = 0;
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task->unsol_datasn = 0;
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memset(r2t, 0, sizeof(*r2t));
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if (session->imm_data_en) {
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if (out_len >= session->first_burst)
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@ -274,12 +294,14 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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zero_data(hdr->dlength);
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if (!session->initial_r2t_en) {
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task->unsol_count = min(session->first_burst, out_len)
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- task->imm_count;
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task->unsol_offset = task->imm_count;
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r2t->data_length = min(session->first_burst, out_len) -
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task->imm_count;
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r2t->data_offset = task->imm_count;
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r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
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r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
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}
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if (!task->unsol_count)
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if (!task->unsol_r2t.data_length)
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/* No unsolicit Data-Out's */
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hdr->flags |= ISCSI_FLAG_CMD_FINAL;
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} else {
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@ -300,8 +322,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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WARN_ON(hdrlength >= 256);
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hdr->hlength = hdrlength & 0xFF;
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if (conn->session->tt->init_task &&
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conn->session->tt->init_task(task))
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if (session->tt->init_task && session->tt->init_task(task))
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return -EIO;
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task->state = ISCSI_TASK_RUNNING;
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@ -332,6 +353,7 @@ static void iscsi_complete_command(struct iscsi_task *task)
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struct iscsi_session *session = conn->session;
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struct scsi_cmnd *sc = task->sc;
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session->tt->cleanup_task(task);
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list_del_init(&task->running);
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task->state = ISCSI_TASK_COMPLETED;
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task->sc = NULL;
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@ -402,8 +424,6 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
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* the cmd in the sequencing
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*/
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conn->session->queued_cmdsn--;
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else
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conn->session->tt->cleanup_task(conn, task);
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sc->result = err;
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if (!scsi_bidi_cmnd(sc))
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@ -423,7 +443,7 @@ static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
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struct iscsi_task *task)
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{
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struct iscsi_session *session = conn->session;
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struct iscsi_hdr *hdr = (struct iscsi_hdr *)task->hdr;
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struct iscsi_hdr *hdr = task->hdr;
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struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
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if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
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@ -456,6 +476,7 @@ static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
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if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
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session->state = ISCSI_STATE_LOGGING_OUT;
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task->state = ISCSI_TASK_RUNNING;
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list_move_tail(&task->running, &conn->mgmt_run_list);
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debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
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hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
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@ -505,23 +526,38 @@ __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
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} else
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task->data_count = 0;
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if (conn->session->tt->alloc_pdu(task)) {
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iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
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"pdu for mgmt task.\n");
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goto requeue_task;
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}
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task->hdr_len = sizeof(struct iscsi_hdr);
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memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
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INIT_LIST_HEAD(&task->running);
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list_add_tail(&task->running, &conn->mgmtqueue);
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if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
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if (iscsi_prep_mgmt_task(conn, task)) {
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__iscsi_put_task(task);
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return NULL;
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}
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if (iscsi_prep_mgmt_task(conn, task))
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goto free_task;
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if (session->tt->xmit_task(task))
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task = NULL;
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goto free_task;
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} else
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scsi_queue_work(conn->session->host, &conn->xmitwork);
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return task;
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free_task:
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__iscsi_put_task(task);
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return NULL;
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requeue_task:
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if (task != conn->login_task)
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__kfifo_put(session->cmdpool.queue, (void*)&task,
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sizeof(void*));
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return NULL;
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}
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int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
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@ -1136,8 +1172,13 @@ check_mgmt:
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fail_command(conn, conn->task, DID_IMM_RETRY << 16);
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continue;
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}
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if (iscsi_prep_scsi_cmd_pdu(conn->task)) {
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fail_command(conn, conn->task, DID_ABORT << 16);
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rc = iscsi_prep_scsi_cmd_pdu(conn->task);
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if (rc) {
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if (rc == -ENOMEM) {
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conn->task = NULL;
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goto again;
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} else
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fail_command(conn, conn->task, DID_ABORT << 16);
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continue;
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}
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rc = iscsi_xmit_task(conn);
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@ -1195,6 +1236,26 @@ static void iscsi_xmitworker(struct work_struct *work)
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} while (rc >= 0 || rc == -EAGAIN);
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}
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static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
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struct scsi_cmnd *sc)
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{
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struct iscsi_task *task;
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if (!__kfifo_get(conn->session->cmdpool.queue,
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(void *) &task, sizeof(void *)))
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return NULL;
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sc->SCp.phase = conn->session->age;
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sc->SCp.ptr = (char *) task;
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atomic_set(&task->refcount, 1);
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task->state = ISCSI_TASK_PENDING;
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task->conn = conn;
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task->sc = sc;
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INIT_LIST_HEAD(&task->running);
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return task;
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}
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enum {
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FAILURE_BAD_HOST = 1,
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FAILURE_SESSION_FAILED,
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@ -1281,33 +1342,27 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
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goto reject;
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}
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if (!__kfifo_get(session->cmdpool.queue, (void*)&task,
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sizeof(void*))) {
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task = iscsi_alloc_task(conn, sc);
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if (!task) {
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reason = FAILURE_OOM;
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goto reject;
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}
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sc->SCp.phase = session->age;
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sc->SCp.ptr = (char *)task;
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atomic_set(&task->refcount, 1);
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task->state = ISCSI_TASK_PENDING;
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task->conn = conn;
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task->sc = sc;
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INIT_LIST_HEAD(&task->running);
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list_add_tail(&task->running, &conn->xmitqueue);
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if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
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if (iscsi_prep_scsi_cmd_pdu(task)) {
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sc->result = DID_ABORT << 16;
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sc->scsi_done = NULL;
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iscsi_complete_command(task);
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goto fault;
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reason = iscsi_prep_scsi_cmd_pdu(task);
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if (reason) {
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if (reason == -ENOMEM) {
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reason = FAILURE_OOM;
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goto prepd_reject;
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} else {
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sc->result = DID_ABORT << 16;
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goto prepd_fault;
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}
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}
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if (session->tt->xmit_task(task)) {
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sc->scsi_done = NULL;
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iscsi_complete_command(task);
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reason = FAILURE_SESSION_NOT_READY;
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goto reject;
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goto prepd_reject;
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}
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} else
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scsi_queue_work(session->host, &conn->xmitwork);
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@ -1317,12 +1372,18 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
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spin_lock(host->host_lock);
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return 0;
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prepd_reject:
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sc->scsi_done = NULL;
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iscsi_complete_command(task);
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reject:
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spin_unlock(&session->lock);
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debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
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spin_lock(host->host_lock);
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return SCSI_MLQUEUE_TARGET_BUSY;
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prepd_fault:
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sc->scsi_done = NULL;
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iscsi_complete_command(task);
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fault:
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spin_unlock(&session->lock);
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debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
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@ -1634,9 +1695,9 @@ static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
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hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
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hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
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hdr->flags |= ISCSI_FLAG_CMD_FINAL;
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memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
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hdr->rtt = task->hdr->itt;
|
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hdr->refcmdsn = task->hdr->cmdsn;
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memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
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hdr->rtt = task->hdr_itt;
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hdr->refcmdsn = task->cmdsn;
|
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}
|
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|
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int iscsi_eh_abort(struct scsi_cmnd *sc)
|
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|
|
|
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|
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@ -93,24 +93,38 @@ enum {
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ISCSI_TASK_RUNNING,
|
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};
|
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|
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struct iscsi_r2t_info {
|
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__be32 ttt; /* copied from R2T */
|
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__be32 exp_statsn; /* copied from R2T */
|
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uint32_t data_length; /* copied from R2T */
|
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uint32_t data_offset; /* copied from R2T */
|
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int data_count; /* DATA-Out payload progress */
|
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int datasn;
|
||||
/* LLDs should set/update these values */
|
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int sent; /* R2T sequence progress */
|
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};
|
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|
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struct iscsi_task {
|
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/*
|
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* Because LLDs allocate their hdr differently, this is a pointer
|
||||
* and length to that storage. It must be setup at session
|
||||
* creation time.
|
||||
*/
|
||||
struct iscsi_cmd *hdr;
|
||||
struct iscsi_hdr *hdr;
|
||||
unsigned short hdr_max;
|
||||
unsigned short hdr_len; /* accumulated size of hdr used */
|
||||
/* copied values in case we need to send tmfs */
|
||||
itt_t hdr_itt;
|
||||
__be32 cmdsn;
|
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uint8_t lun[8];
|
||||
|
||||
int itt; /* this ITT */
|
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|
||||
uint32_t unsol_datasn;
|
||||
unsigned imm_count; /* imm-data (bytes) */
|
||||
unsigned unsol_count; /* unsolicited (bytes)*/
|
||||
/* offset in unsolicited stream (bytes); */
|
||||
unsigned unsol_offset;
|
||||
unsigned data_count; /* remaining Data-Out */
|
||||
struct iscsi_r2t_info unsol_r2t;
|
||||
char *data; /* mgmt payload */
|
||||
unsigned data_count;
|
||||
struct scsi_cmnd *sc; /* associated SCSI cmd*/
|
||||
struct iscsi_conn *conn; /* used connection */
|
||||
|
||||
|
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@ -121,6 +135,11 @@ struct iscsi_task {
|
|||
void *dd_data; /* driver/transport data */
|
||||
};
|
||||
|
||||
static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
|
||||
{
|
||||
return task->unsol_r2t.data_length > task->unsol_r2t.sent;
|
||||
}
|
||||
|
||||
static inline void* iscsi_next_hdr(struct iscsi_task *task)
|
||||
{
|
||||
return (void*)task->hdr + task->hdr_len;
|
||||
|
|
@ -376,8 +395,9 @@ extern void iscsi_suspend_tx(struct iscsi_conn *conn);
|
|||
* pdu and task processing
|
||||
*/
|
||||
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
|
||||
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *,
|
||||
struct iscsi_data *hdr);
|
||||
extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
|
||||
struct iscsi_r2t_info *r2t,
|
||||
struct iscsi_data *hdr);
|
||||
extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
|
||||
char *, uint32_t);
|
||||
extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
|
||||
|
|
|
|||
|
|
@ -113,10 +113,15 @@ struct iscsi_transport {
|
|||
char *data, uint32_t data_size);
|
||||
void (*get_stats) (struct iscsi_cls_conn *conn,
|
||||
struct iscsi_stats *stats);
|
||||
|
||||
int (*init_task) (struct iscsi_task *task);
|
||||
int (*xmit_task) (struct iscsi_task *task);
|
||||
void (*cleanup_task) (struct iscsi_conn *conn,
|
||||
struct iscsi_task *task);
|
||||
void (*cleanup_task) (struct iscsi_task *task);
|
||||
|
||||
int (*alloc_pdu) (struct iscsi_task *task);
|
||||
int (*xmit_pdu) (struct iscsi_task *task);
|
||||
int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
|
||||
unsigned int count);
|
||||
void (*session_recovery_timedout) (struct iscsi_cls_session *session);
|
||||
struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr,
|
||||
int non_blocking);
|
||||
|
|
|
|||
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