![Erez Zilber](/assets/img/avatar_default.png)
When a connection is started (a new connection or a recovered one), iSER should prepare its resources for full-featured mode and only then notify the iSCSI layer that it is ready to start queueing commands. Signed-off-by: Erez Zilber <erezz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
661 lines
17 KiB
C
661 lines
17 KiB
C
/*
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* iSCSI Initiator over iSER Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 Mike Christie
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* Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
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* maintained by openib-general@openib.org
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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* Modified by:
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* Erez Zilber
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*
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*
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* $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/hardirq.h>
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#include <linux/kfifo.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "iscsi_iser.h"
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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int iser_debug_level = 0;
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MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
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"v" DRV_VER " (" DRV_DATE ")");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
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module_param_named(debug_level, iser_debug_level, int, 0644);
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
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struct iser_global ig;
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void
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iscsi_iser_recv(struct iscsi_conn *conn,
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struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
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{
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int rc = 0;
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uint32_t ret_itt;
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int datalen;
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int ahslen;
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/* verify PDU length */
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datalen = ntoh24(hdr->dlength);
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if (datalen != rx_data_len) {
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printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
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datalen, rx_data_len);
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rc = ISCSI_ERR_DATALEN;
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goto error;
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}
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/* read AHS */
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ahslen = hdr->hlength * 4;
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/* verify itt (itt encoding: age+cid+itt) */
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rc = iscsi_verify_itt(conn, hdr, &ret_itt);
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if (!rc)
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rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
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if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
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goto error;
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return;
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error:
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iscsi_conn_failure(conn, rc);
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}
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/**
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* iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
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*
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**/
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static void
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iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
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{
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struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data;
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struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
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struct scsi_cmnd *sc = ctask->sc;
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iser_ctask->command_sent = 0;
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iser_ctask->iser_conn = iser_conn;
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if (sc->sc_data_direction == DMA_TO_DEVICE) {
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BUG_ON(ctask->total_length == 0);
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debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
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ctask->itt, ctask->total_length, ctask->imm_count,
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ctask->unsol_count);
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}
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iser_ctask_rdma_init(iser_ctask);
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}
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/**
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* iscsi_mtask_xmit - xmit management(immediate) task
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* @conn: iscsi connection
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* @mtask: task management task
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*
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* Notes:
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* The function can return -EAGAIN in which case caller must
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* call it again later, or recover. '0' return code means successful
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* xmit.
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*
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**/
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static int
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iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
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struct iscsi_mgmt_task *mtask)
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{
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int error = 0;
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debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
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error = iser_send_control(conn, mtask);
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/* since iser xmits control with zero copy, mtasks can not be recycled
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* right after sending them.
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* The recycling scheme is based on whether a response is expected
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* - if yes, the mtask is recycled at iscsi_complete_pdu
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* - if no, the mtask is recycled at iser_snd_completion
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*/
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if (error && error != -EAGAIN)
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iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
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return error;
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}
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static int
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iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
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struct iscsi_cmd_task *ctask)
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{
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struct iscsi_data hdr;
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int error = 0;
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/* Send data-out PDUs while there's still unsolicited data to send */
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while (ctask->unsol_count > 0) {
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iscsi_prep_unsolicit_data_pdu(ctask, &hdr);
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debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
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hdr.itt, ctask->data_count);
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/* the buffer description has been passed with the command */
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/* Send the command */
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error = iser_send_data_out(conn, ctask, &hdr);
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if (error) {
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ctask->unsol_datasn--;
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goto iscsi_iser_ctask_xmit_unsol_data_exit;
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}
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ctask->unsol_count -= ctask->data_count;
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debug_scsi("Need to send %d more as data-out PDUs\n",
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ctask->unsol_count);
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}
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iscsi_iser_ctask_xmit_unsol_data_exit:
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return error;
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}
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static int
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iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
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struct iscsi_cmd_task *ctask)
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{
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struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
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int error = 0;
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debug_scsi("ctask deq [cid %d itt 0x%x]\n",
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conn->id, ctask->itt);
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/*
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* serialize with TMF AbortTask
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*/
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if (ctask->mtask)
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return error;
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/* Send the cmd PDU */
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if (!iser_ctask->command_sent) {
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error = iser_send_command(conn, ctask);
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if (error)
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goto iscsi_iser_ctask_xmit_exit;
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iser_ctask->command_sent = 1;
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}
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/* Send unsolicited data-out PDU(s) if necessary */
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if (ctask->unsol_count)
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error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
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iscsi_iser_ctask_xmit_exit:
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if (error && error != -EAGAIN)
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iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
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return error;
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}
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static void
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iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
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if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
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iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
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iser_ctask_rdma_finalize(iser_ctask);
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}
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}
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static struct iser_conn *
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iscsi_iser_ib_conn_lookup(__u64 ep_handle)
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{
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struct iser_conn *ib_conn;
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struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
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mutex_lock(&ig.connlist_mutex);
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list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
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if (ib_conn == uib_conn) {
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mutex_unlock(&ig.connlist_mutex);
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return ib_conn;
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}
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}
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mutex_unlock(&ig.connlist_mutex);
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iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
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return NULL;
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}
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static struct iscsi_cls_conn *
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iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
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{
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struct iscsi_conn *conn;
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struct iscsi_cls_conn *cls_conn;
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struct iscsi_iser_conn *iser_conn;
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cls_conn = iscsi_conn_setup(cls_session, conn_idx);
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if (!cls_conn)
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return NULL;
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conn = cls_conn->dd_data;
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/*
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* due to issues with the login code re iser sematics
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* this not set in iscsi_conn_setup - FIXME
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*/
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conn->max_recv_dlength = 128;
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iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
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if (!iser_conn)
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goto conn_alloc_fail;
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/* currently this is the only field which need to be initiated */
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rwlock_init(&iser_conn->lock);
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conn->dd_data = iser_conn;
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iser_conn->iscsi_conn = conn;
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return cls_conn;
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conn_alloc_fail:
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iscsi_conn_teardown(cls_conn);
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return NULL;
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}
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static void
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iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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iscsi_conn_teardown(cls_conn);
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if (iser_conn->ib_conn)
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iser_conn->ib_conn->iser_conn = NULL;
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kfree(iser_conn);
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}
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static int
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iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
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struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
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int is_leading)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_iser_conn *iser_conn;
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struct iser_conn *ib_conn;
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int error;
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error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
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if (error)
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return error;
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/* the transport ep handle comes from user space so it must be
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* verified against the global ib connections list */
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ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
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if (!ib_conn) {
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iser_err("can't bind eph %llx\n",
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(unsigned long long)transport_eph);
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return -EINVAL;
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}
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/* binds the iSER connection retrieved from the previously
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* connected ep_handle to the iSCSI layer connection. exchanges
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* connection pointers */
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iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
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iser_conn = conn->dd_data;
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ib_conn->iser_conn = iser_conn;
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iser_conn->ib_conn = ib_conn;
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conn->recv_lock = &iser_conn->lock;
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return 0;
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}
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static int
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iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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int err;
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err = iser_conn_set_full_featured_mode(conn);
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if (err)
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return err;
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return iscsi_conn_start(cls_conn);
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}
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static struct iscsi_transport iscsi_iser_transport;
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static struct iscsi_cls_session *
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iscsi_iser_session_create(struct iscsi_transport *iscsit,
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struct scsi_transport_template *scsit,
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uint32_t initial_cmdsn, uint32_t *hostno)
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{
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struct iscsi_cls_session *cls_session;
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struct iscsi_session *session;
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int i;
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uint32_t hn;
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struct iscsi_cmd_task *ctask;
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struct iscsi_mgmt_task *mtask;
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struct iscsi_iser_cmd_task *iser_ctask;
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struct iser_desc *desc;
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cls_session = iscsi_session_setup(iscsit, scsit,
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sizeof(struct iscsi_iser_cmd_task),
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sizeof(struct iser_desc),
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initial_cmdsn, &hn);
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if (!cls_session)
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return NULL;
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*hostno = hn;
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session = class_to_transport_session(cls_session);
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/* libiscsi setup itts, data and pool so just set desc fields */
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for (i = 0; i < session->cmds_max; i++) {
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ctask = session->cmds[i];
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iser_ctask = ctask->dd_data;
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ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
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}
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for (i = 0; i < session->mgmtpool_max; i++) {
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mtask = session->mgmt_cmds[i];
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desc = mtask->dd_data;
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mtask->hdr = &desc->iscsi_header;
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desc->data = mtask->data;
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}
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return cls_session;
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}
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static int
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iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
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enum iscsi_param param, char *buf, int buflen)
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{
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int value;
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switch (param) {
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case ISCSI_PARAM_MAX_RECV_DLENGTH:
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/* TBD */
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break;
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case ISCSI_PARAM_HDRDGST_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "DataDigest wasn't negotiated to None");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_DATADGST_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "DataDigest wasn't negotiated to None");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_IFMARKER_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "IFMarker wasn't negotiated to No");
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return -EPROTO;
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}
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break;
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case ISCSI_PARAM_OFMARKER_EN:
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sscanf(buf, "%d", &value);
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if (value) {
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printk(KERN_ERR "OFMarker wasn't negotiated to No");
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return -EPROTO;
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}
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break;
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default:
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return iscsi_set_param(cls_conn, param, buf, buflen);
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}
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return 0;
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}
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static void
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iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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stats->txdata_octets = conn->txdata_octets;
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stats->rxdata_octets = conn->rxdata_octets;
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stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
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stats->dataout_pdus = conn->dataout_pdus_cnt;
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stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
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stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
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stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
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stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
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stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
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stats->custom_length = 3;
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strcpy(stats->custom[0].desc, "qp_tx_queue_full");
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stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
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strcpy(stats->custom[1].desc, "fmr_map_not_avail");
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stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
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strcpy(stats->custom[2].desc, "eh_abort_cnt");
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stats->custom[2].value = conn->eh_abort_cnt;
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}
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static int
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iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
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__u64 *ep_handle)
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{
|
|
int err;
|
|
struct iser_conn *ib_conn;
|
|
|
|
err = iser_conn_init(&ib_conn);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
|
|
if (!err)
|
|
*ep_handle = (__u64)(unsigned long)ib_conn;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
|
|
{
|
|
struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
|
|
int rc;
|
|
|
|
if (!ib_conn)
|
|
return -EINVAL;
|
|
|
|
rc = wait_event_interruptible_timeout(ib_conn->wait,
|
|
ib_conn->state == ISER_CONN_UP,
|
|
msecs_to_jiffies(timeout_ms));
|
|
|
|
/* if conn establishment failed, return error code to iscsi */
|
|
if (!rc &&
|
|
(ib_conn->state == ISER_CONN_TERMINATING ||
|
|
ib_conn->state == ISER_CONN_DOWN))
|
|
rc = -1;
|
|
|
|
iser_err("ib conn %p rc = %d\n", ib_conn, rc);
|
|
|
|
if (rc > 0)
|
|
return 1; /* success, this is the equivalent of POLLOUT */
|
|
else if (!rc)
|
|
return 0; /* timeout */
|
|
else
|
|
return rc; /* signal */
|
|
}
|
|
|
|
static void
|
|
iscsi_iser_ep_disconnect(__u64 ep_handle)
|
|
{
|
|
struct iser_conn *ib_conn;
|
|
|
|
ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
|
|
if (!ib_conn)
|
|
return;
|
|
|
|
iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
|
|
iser_conn_terminate(ib_conn);
|
|
}
|
|
|
|
static struct scsi_host_template iscsi_iser_sht = {
|
|
.name = "iSCSI Initiator over iSER, v." DRV_VER,
|
|
.queuecommand = iscsi_queuecommand,
|
|
.can_queue = ISCSI_XMIT_CMDS_MAX - 1,
|
|
.sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
|
|
.max_sectors = 1024,
|
|
.cmd_per_lun = ISCSI_MAX_CMD_PER_LUN,
|
|
.eh_abort_handler = iscsi_eh_abort,
|
|
.eh_host_reset_handler = iscsi_eh_host_reset,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.proc_name = "iscsi_iser",
|
|
.this_id = -1,
|
|
};
|
|
|
|
static struct iscsi_transport iscsi_iser_transport = {
|
|
.owner = THIS_MODULE,
|
|
.name = "iser",
|
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
|
|
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
|
ISCSI_MAX_XMIT_DLENGTH |
|
|
ISCSI_HDRDGST_EN |
|
|
ISCSI_DATADGST_EN |
|
|
ISCSI_INITIAL_R2T_EN |
|
|
ISCSI_MAX_R2T |
|
|
ISCSI_IMM_DATA_EN |
|
|
ISCSI_FIRST_BURST |
|
|
ISCSI_MAX_BURST |
|
|
ISCSI_PDU_INORDER_EN |
|
|
ISCSI_DATASEQ_INORDER_EN |
|
|
ISCSI_EXP_STATSN |
|
|
ISCSI_PERSISTENT_PORT |
|
|
ISCSI_PERSISTENT_ADDRESS |
|
|
ISCSI_TARGET_NAME |
|
|
ISCSI_TPGT,
|
|
.host_template = &iscsi_iser_sht,
|
|
.conndata_size = sizeof(struct iscsi_conn),
|
|
.max_lun = ISCSI_ISER_MAX_LUN,
|
|
.max_cmd_len = ISCSI_ISER_MAX_CMD_LEN,
|
|
/* session management */
|
|
.create_session = iscsi_iser_session_create,
|
|
.destroy_session = iscsi_session_teardown,
|
|
/* connection management */
|
|
.create_conn = iscsi_iser_conn_create,
|
|
.bind_conn = iscsi_iser_conn_bind,
|
|
.destroy_conn = iscsi_iser_conn_destroy,
|
|
.set_param = iscsi_iser_set_param,
|
|
.get_conn_param = iscsi_conn_get_param,
|
|
.get_session_param = iscsi_session_get_param,
|
|
.start_conn = iscsi_iser_conn_start,
|
|
.stop_conn = iscsi_conn_stop,
|
|
/* IO */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
.get_stats = iscsi_iser_conn_get_stats,
|
|
.init_cmd_task = iscsi_iser_cmd_init,
|
|
.xmit_cmd_task = iscsi_iser_ctask_xmit,
|
|
.xmit_mgmt_task = iscsi_iser_mtask_xmit,
|
|
.cleanup_cmd_task = iscsi_iser_cleanup_ctask,
|
|
/* recovery */
|
|
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
|
|
|
.ep_connect = iscsi_iser_ep_connect,
|
|
.ep_poll = iscsi_iser_ep_poll,
|
|
.ep_disconnect = iscsi_iser_ep_disconnect
|
|
};
|
|
|
|
static int __init iser_init(void)
|
|
{
|
|
int err;
|
|
|
|
iser_dbg("Starting iSER datamover...\n");
|
|
|
|
if (iscsi_max_lun < 1) {
|
|
printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iscsi_iser_transport.max_lun = iscsi_max_lun;
|
|
|
|
memset(&ig, 0, sizeof(struct iser_global));
|
|
|
|
ig.desc_cache = kmem_cache_create("iser_descriptors",
|
|
sizeof (struct iser_desc),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
if (ig.desc_cache == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* device init is called only after the first addr resolution */
|
|
mutex_init(&ig.device_list_mutex);
|
|
INIT_LIST_HEAD(&ig.device_list);
|
|
mutex_init(&ig.connlist_mutex);
|
|
INIT_LIST_HEAD(&ig.connlist);
|
|
|
|
if (!iscsi_register_transport(&iscsi_iser_transport)) {
|
|
iser_err("iscsi_register_transport failed\n");
|
|
err = -EINVAL;
|
|
goto register_transport_failure;
|
|
}
|
|
|
|
return 0;
|
|
|
|
register_transport_failure:
|
|
kmem_cache_destroy(ig.desc_cache);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit iser_exit(void)
|
|
{
|
|
iser_dbg("Removing iSER datamover...\n");
|
|
iscsi_unregister_transport(&iscsi_iser_transport);
|
|
kmem_cache_destroy(ig.desc_cache);
|
|
}
|
|
|
|
module_init(iser_init);
|
|
module_exit(iser_exit);
|