639 lines
17 KiB
C
639 lines
17 KiB
C
/**
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* Copyright (C) 2005 - 2009 ServerEngines
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation. The full GNU General
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* Public License is included in this distribution in the file called COPYING.
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*
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* Written by: Jayamohan Kallickal (jayamohank@serverengines.com)
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*
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* Contact Information:
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* linux-drivers@serverengines.com
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*
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* ServerEngines
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* 209 N. Fair Oaks Ave
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* Sunnyvale, CA 94085
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*
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*/
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#include <scsi/libiscsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <scsi/scsi_transport.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_host.h>
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#include <scsi/scsi.h>
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#include "be_iscsi.h"
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extern struct iscsi_transport beiscsi_iscsi_transport;
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/**
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* beiscsi_session_create - creates a new iscsi session
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* @cmds_max: max commands supported
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* @qdepth: max queue depth supported
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* @initial_cmdsn: initial iscsi CMDSN
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*/
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struct iscsi_cls_session *beiscsi_session_create(struct iscsi_endpoint *ep,
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u16 cmds_max,
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u16 qdepth,
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u32 initial_cmdsn)
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{
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struct Scsi_Host *shost;
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struct beiscsi_endpoint *beiscsi_ep;
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struct iscsi_cls_session *cls_session;
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struct beiscsi_hba *phba;
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struct iscsi_session *sess;
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struct beiscsi_session *beiscsi_sess;
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struct beiscsi_io_task *io_task;
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SE_DEBUG(DBG_LVL_8, "In beiscsi_session_create\n");
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if (!ep) {
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SE_DEBUG(DBG_LVL_1, "beiscsi_session_create: invalid ep \n");
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return NULL;
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}
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beiscsi_ep = ep->dd_data;
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phba = beiscsi_ep->phba;
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shost = phba->shost;
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if (cmds_max > beiscsi_ep->phba->params.wrbs_per_cxn) {
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shost_printk(KERN_ERR, shost, "Cannot handle %d cmds."
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"Max cmds per session supported is %d. Using %d. "
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"\n", cmds_max,
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beiscsi_ep->phba->params.wrbs_per_cxn,
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beiscsi_ep->phba->params.wrbs_per_cxn);
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cmds_max = beiscsi_ep->phba->params.wrbs_per_cxn;
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}
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cls_session = iscsi_session_setup(&beiscsi_iscsi_transport,
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shost, cmds_max,
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sizeof(*beiscsi_sess),
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sizeof(*io_task),
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initial_cmdsn, ISCSI_MAX_TARGET);
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if (!cls_session)
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return NULL;
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sess = cls_session->dd_data;
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beiscsi_sess = sess->dd_data;
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beiscsi_sess->bhs_pool = pci_pool_create("beiscsi_bhs_pool",
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phba->pcidev,
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sizeof(struct be_cmd_bhs),
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64, 0);
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if (!beiscsi_sess->bhs_pool)
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goto destroy_sess;
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return cls_session;
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destroy_sess:
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iscsi_session_teardown(cls_session);
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return NULL;
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}
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/**
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* beiscsi_session_destroy - destroys iscsi session
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* @cls_session: pointer to iscsi cls session
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*
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* Destroys iSCSI session instance and releases
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* resources allocated for it.
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*/
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void beiscsi_session_destroy(struct iscsi_cls_session *cls_session)
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{
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struct iscsi_session *sess = cls_session->dd_data;
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struct beiscsi_session *beiscsi_sess = sess->dd_data;
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pci_pool_destroy(beiscsi_sess->bhs_pool);
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iscsi_session_teardown(cls_session);
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}
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/**
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* beiscsi_conn_create - create an instance of iscsi connection
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* @cls_session: ptr to iscsi_cls_session
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* @cid: iscsi cid
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*/
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struct iscsi_cls_conn *
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beiscsi_conn_create(struct iscsi_cls_session *cls_session, u32 cid)
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{
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struct beiscsi_hba *phba;
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struct Scsi_Host *shost;
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struct iscsi_cls_conn *cls_conn;
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struct beiscsi_conn *beiscsi_conn;
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struct iscsi_conn *conn;
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struct iscsi_session *sess;
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struct beiscsi_session *beiscsi_sess;
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SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_create ,cid"
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"from iscsi layer=%d\n", cid);
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shost = iscsi_session_to_shost(cls_session);
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phba = iscsi_host_priv(shost);
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cls_conn = iscsi_conn_setup(cls_session, sizeof(*beiscsi_conn), cid);
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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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beiscsi_conn = conn->dd_data;
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beiscsi_conn->ep = NULL;
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beiscsi_conn->phba = phba;
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beiscsi_conn->conn = conn;
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sess = cls_session->dd_data;
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beiscsi_sess = sess->dd_data;
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beiscsi_conn->beiscsi_sess = beiscsi_sess;
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return cls_conn;
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}
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/**
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* beiscsi_bindconn_cid - Bind the beiscsi_conn with phba connection table
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* @beiscsi_conn: The pointer to beiscsi_conn structure
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* @phba: The phba instance
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* @cid: The cid to free
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*/
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static int beiscsi_bindconn_cid(struct beiscsi_hba *phba,
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struct beiscsi_conn *beiscsi_conn,
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unsigned int cid)
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{
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if (phba->conn_table[cid]) {
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SE_DEBUG(DBG_LVL_1,
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"Connection table already occupied. Detected clash\n");
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return -EINVAL;
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} else {
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SE_DEBUG(DBG_LVL_8, "phba->conn_table[%d]=%p(beiscsi_conn) \n",
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cid, beiscsi_conn);
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phba->conn_table[cid] = beiscsi_conn;
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}
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return 0;
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}
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/**
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* beiscsi_conn_bind - Binds iscsi session/connection with TCP connection
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* @cls_session: pointer to iscsi cls session
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* @cls_conn: pointer to iscsi cls conn
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* @transport_fd: EP handle(64 bit)
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*
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* This function binds the TCP Conn with iSCSI Connection and Session.
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*/
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int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
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struct iscsi_cls_conn *cls_conn,
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u64 transport_fd, int is_leading)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct beiscsi_conn *beiscsi_conn = conn->dd_data;
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struct Scsi_Host *shost =
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(struct Scsi_Host *)iscsi_session_to_shost(cls_session);
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struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
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struct beiscsi_endpoint *beiscsi_ep;
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struct iscsi_endpoint *ep;
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SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_bind\n");
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ep = iscsi_lookup_endpoint(transport_fd);
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if (!ep)
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return -EINVAL;
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beiscsi_ep = ep->dd_data;
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if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
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return -EINVAL;
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if (beiscsi_ep->phba != phba) {
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SE_DEBUG(DBG_LVL_8,
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"beiscsi_ep->hba=%p not equal to phba=%p \n",
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beiscsi_ep->phba, phba);
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return -EEXIST;
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}
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beiscsi_conn->beiscsi_conn_cid = beiscsi_ep->ep_cid;
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beiscsi_conn->ep = beiscsi_ep;
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beiscsi_ep->conn = beiscsi_conn;
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SE_DEBUG(DBG_LVL_8, "beiscsi_conn=%p conn=%p ep_cid=%d \n",
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beiscsi_conn, conn, beiscsi_ep->ep_cid);
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return beiscsi_bindconn_cid(phba, beiscsi_conn, beiscsi_ep->ep_cid);
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}
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/**
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* beiscsi_conn_get_param - get the iscsi parameter
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* @cls_conn: pointer to iscsi cls conn
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* @param: parameter type identifier
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* @buf: buffer pointer
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*
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* returns iscsi parameter
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*/
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int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
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enum iscsi_param param, char *buf)
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{
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struct beiscsi_endpoint *beiscsi_ep;
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struct iscsi_conn *conn = cls_conn->dd_data;
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struct beiscsi_conn *beiscsi_conn = conn->dd_data;
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int len = 0;
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beiscsi_ep = beiscsi_conn->ep;
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if (!beiscsi_ep) {
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SE_DEBUG(DBG_LVL_1,
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"In beiscsi_conn_get_param , no beiscsi_ep\n");
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return -1;
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}
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switch (param) {
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case ISCSI_PARAM_CONN_PORT:
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len = sprintf(buf, "%hu\n", beiscsi_ep->dst_tcpport);
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break;
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case ISCSI_PARAM_CONN_ADDRESS:
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if (beiscsi_ep->ip_type == BE2_IPV4)
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len = sprintf(buf, "%pI4\n", &beiscsi_ep->dst_addr);
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else
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len = sprintf(buf, "%pI6\n", &beiscsi_ep->dst6_addr);
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break;
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default:
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return iscsi_conn_get_param(cls_conn, param, buf);
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}
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return len;
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}
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int beiscsi_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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struct iscsi_conn *conn = cls_conn->dd_data;
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struct iscsi_session *session = conn->session;
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int ret;
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ret = iscsi_set_param(cls_conn, param, buf, buflen);
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if (ret)
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return ret;
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/*
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* If userspace tried to set the value to higher than we can
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* support override here.
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*/
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switch (param) {
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case ISCSI_PARAM_FIRST_BURST:
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if (session->first_burst > 8192)
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session->first_burst = 8192;
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break;
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case ISCSI_PARAM_MAX_RECV_DLENGTH:
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if (conn->max_recv_dlength > 65536)
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conn->max_recv_dlength = 65536;
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break;
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case ISCSI_PARAM_MAX_BURST:
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if (session->first_burst > 262144)
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session->first_burst = 262144;
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break;
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default:
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return 0;
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}
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return 0;
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}
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/**
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* beiscsi_get_host_param - get the iscsi parameter
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* @shost: pointer to scsi_host structure
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* @param: parameter type identifier
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* @buf: buffer pointer
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*
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* returns host parameter
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*/
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int beiscsi_get_host_param(struct Scsi_Host *shost,
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enum iscsi_host_param param, char *buf)
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{
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struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
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int len = 0;
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switch (param) {
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case ISCSI_HOST_PARAM_HWADDRESS:
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be_cmd_get_mac_addr(&phba->ctrl, phba->mac_address);
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len = sysfs_format_mac(buf, phba->mac_address, ETH_ALEN);
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break;
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default:
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return iscsi_host_get_param(shost, param, buf);
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}
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return len;
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}
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/**
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* beiscsi_conn_get_stats - get the iscsi stats
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* @cls_conn: pointer to iscsi cls conn
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* @stats: pointer to iscsi_stats structure
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*
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* returns iscsi stats
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*/
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void beiscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn,
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struct iscsi_stats *stats)
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{
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struct iscsi_conn *conn = cls_conn->dd_data;
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SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_get_stats\n");
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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->dataout_pdus = conn->dataout_pdus_cnt;
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stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
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stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
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stats->datain_pdus = conn->datain_pdus_cnt;
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stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
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stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
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stats->r2t_pdus = conn->r2t_pdus_cnt;
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stats->digest_err = 0;
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stats->timeout_err = 0;
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stats->custom_length = 0;
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strcpy(stats->custom[0].desc, "eh_abort_cnt");
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stats->custom[0].value = conn->eh_abort_cnt;
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}
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/**
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* beiscsi_set_params_for_offld - get the parameters for offload
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* @beiscsi_conn: pointer to beiscsi_conn
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* @params: pointer to offload_params structure
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*/
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static void beiscsi_set_params_for_offld(struct beiscsi_conn *beiscsi_conn,
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struct beiscsi_offload_params *params)
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{
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struct iscsi_conn *conn = beiscsi_conn->conn;
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struct iscsi_session *session = conn->session;
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, max_burst_length,
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params, session->max_burst);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params,
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max_send_data_segment_length, params,
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conn->max_xmit_dlength);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, first_burst_length,
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params, session->first_burst);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, erl, params,
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session->erl);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, dde, params,
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conn->datadgst_en);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, hde, params,
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conn->hdrdgst_en);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, ir2t, params,
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session->initial_r2t_en);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, imd, params,
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session->imm_data_en);
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AMAP_SET_BITS(struct amap_beiscsi_offload_params, exp_statsn, params,
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(conn->exp_statsn - 1));
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}
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/**
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* beiscsi_conn_start - offload of session to chip
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* @cls_conn: pointer to beiscsi_conn
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*/
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int beiscsi_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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struct beiscsi_conn *beiscsi_conn = conn->dd_data;
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struct beiscsi_endpoint *beiscsi_ep;
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struct beiscsi_offload_params params;
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struct iscsi_session *session = conn->session;
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struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
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struct beiscsi_hba *phba = iscsi_host_priv(shost);
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memset(¶ms, 0, sizeof(struct beiscsi_offload_params));
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beiscsi_ep = beiscsi_conn->ep;
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if (!beiscsi_ep)
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SE_DEBUG(DBG_LVL_1, "In beiscsi_conn_start , no beiscsi_ep\n");
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free_mgmt_sgl_handle(phba, beiscsi_conn->plogin_sgl_handle);
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beiscsi_conn->login_in_progress = 0;
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beiscsi_set_params_for_offld(beiscsi_conn, ¶ms);
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beiscsi_offload_connection(beiscsi_conn, ¶ms);
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iscsi_conn_start(cls_conn);
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return 0;
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}
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/**
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* beiscsi_get_cid - Allocate a cid
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* @phba: The phba instance
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*/
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static int beiscsi_get_cid(struct beiscsi_hba *phba)
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{
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unsigned short cid = 0xFFFF;
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if (!phba->avlbl_cids)
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return cid;
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cid = phba->cid_array[phba->cid_alloc++];
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if (phba->cid_alloc == phba->params.cxns_per_ctrl)
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phba->cid_alloc = 0;
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phba->avlbl_cids--;
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return cid;
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}
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/**
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* beiscsi_open_conn - Ask FW to open a TCP connection
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* @ep: endpoint to be used
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* @src_addr: The source IP address
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* @dst_addr: The Destination IP address
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*
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* Asks the FW to open a TCP connection
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*/
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static int beiscsi_open_conn(struct iscsi_endpoint *ep,
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struct sockaddr *src_addr,
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struct sockaddr *dst_addr, int non_blocking)
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{
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struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
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struct beiscsi_hba *phba = beiscsi_ep->phba;
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int ret = -1;
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beiscsi_ep->ep_cid = beiscsi_get_cid(phba);
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if (beiscsi_ep->ep_cid == 0xFFFF) {
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SE_DEBUG(DBG_LVL_1, "No free cid available\n");
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return ret;
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}
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SE_DEBUG(DBG_LVL_8, "In beiscsi_open_conn, ep_cid=%d ",
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beiscsi_ep->ep_cid);
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phba->ep_array[beiscsi_ep->ep_cid] = ep;
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if (beiscsi_ep->ep_cid >
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(phba->fw_config.iscsi_cid_start + phba->params.cxns_per_ctrl)) {
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SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
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return ret;
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}
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beiscsi_ep->cid_vld = 0;
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return mgmt_open_connection(phba, dst_addr, beiscsi_ep);
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}
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/**
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* beiscsi_put_cid - Free the cid
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* @phba: The phba for which the cid is being freed
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* @cid: The cid to free
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*/
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static void beiscsi_put_cid(struct beiscsi_hba *phba, unsigned short cid)
|
|
{
|
|
phba->avlbl_cids++;
|
|
phba->cid_array[phba->cid_free++] = cid;
|
|
if (phba->cid_free == phba->params.cxns_per_ctrl)
|
|
phba->cid_free = 0;
|
|
}
|
|
|
|
/**
|
|
* beiscsi_free_ep - free endpoint
|
|
* @ep: pointer to iscsi endpoint structure
|
|
*/
|
|
static void beiscsi_free_ep(struct iscsi_endpoint *ep)
|
|
{
|
|
struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
|
|
struct beiscsi_hba *phba = beiscsi_ep->phba;
|
|
|
|
beiscsi_put_cid(phba, beiscsi_ep->ep_cid);
|
|
beiscsi_ep->phba = NULL;
|
|
iscsi_destroy_endpoint(ep);
|
|
}
|
|
|
|
/**
|
|
* beiscsi_ep_connect - Ask chip to create TCP Conn
|
|
* @scsi_host: Pointer to scsi_host structure
|
|
* @dst_addr: The IP address of Target
|
|
* @non_blocking: blocking or non-blocking call
|
|
*
|
|
* This routines first asks chip to create a connection and then allocates an EP
|
|
*/
|
|
struct iscsi_endpoint *
|
|
beiscsi_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
|
|
int non_blocking)
|
|
{
|
|
struct beiscsi_hba *phba;
|
|
struct beiscsi_endpoint *beiscsi_ep;
|
|
struct iscsi_endpoint *ep;
|
|
int ret;
|
|
|
|
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_connect \n");
|
|
if (shost)
|
|
phba = iscsi_host_priv(shost);
|
|
else {
|
|
ret = -ENXIO;
|
|
SE_DEBUG(DBG_LVL_1, "shost is NULL \n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
ep = iscsi_create_endpoint(sizeof(struct beiscsi_endpoint));
|
|
if (!ep) {
|
|
ret = -ENOMEM;
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
beiscsi_ep = ep->dd_data;
|
|
beiscsi_ep->phba = phba;
|
|
|
|
if (beiscsi_open_conn(ep, NULL, dst_addr, non_blocking)) {
|
|
SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
|
|
ret = -ENOMEM;
|
|
goto free_ep;
|
|
}
|
|
|
|
return ep;
|
|
|
|
free_ep:
|
|
beiscsi_free_ep(ep);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* beiscsi_ep_poll - Poll to see if connection is established
|
|
* @ep: endpoint to be used
|
|
* @timeout_ms: timeout specified in millisecs
|
|
*
|
|
* Poll to see if TCP connection established
|
|
*/
|
|
int beiscsi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
|
|
{
|
|
struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
|
|
|
|
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_poll\n");
|
|
if (beiscsi_ep->cid_vld == 1)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* beiscsi_close_conn - Upload the connection
|
|
* @ep: The iscsi endpoint
|
|
* @flag: The type of connection closure
|
|
*/
|
|
static int beiscsi_close_conn(struct iscsi_endpoint *ep, int flag)
|
|
{
|
|
int ret = 0;
|
|
struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
|
|
struct beiscsi_hba *phba = beiscsi_ep->phba;
|
|
|
|
if (MGMT_STATUS_SUCCESS !=
|
|
mgmt_upload_connection(phba, beiscsi_ep->ep_cid,
|
|
CONNECTION_UPLOAD_GRACEFUL)) {
|
|
SE_DEBUG(DBG_LVL_8, "upload failed for cid 0x%x",
|
|
beiscsi_ep->ep_cid);
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* beiscsi_ep_disconnect - Tears down the TCP connection
|
|
* @ep: endpoint to be used
|
|
*
|
|
* Tears down the TCP connection
|
|
*/
|
|
void beiscsi_ep_disconnect(struct iscsi_endpoint *ep)
|
|
{
|
|
struct beiscsi_conn *beiscsi_conn;
|
|
struct beiscsi_endpoint *beiscsi_ep;
|
|
struct beiscsi_hba *phba;
|
|
int flag = 0;
|
|
|
|
beiscsi_ep = ep->dd_data;
|
|
phba = beiscsi_ep->phba;
|
|
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect\n");
|
|
|
|
if (beiscsi_ep->conn) {
|
|
beiscsi_conn = beiscsi_ep->conn;
|
|
iscsi_suspend_queue(beiscsi_conn->conn);
|
|
beiscsi_close_conn(ep, flag);
|
|
}
|
|
|
|
beiscsi_free_ep(ep);
|
|
}
|
|
|
|
/**
|
|
* beiscsi_unbind_conn_to_cid - Unbind the beiscsi_conn from phba conn table
|
|
* @phba: The phba instance
|
|
* @cid: The cid to free
|
|
*/
|
|
static int beiscsi_unbind_conn_to_cid(struct beiscsi_hba *phba,
|
|
unsigned int cid)
|
|
{
|
|
if (phba->conn_table[cid])
|
|
phba->conn_table[cid] = NULL;
|
|
else {
|
|
SE_DEBUG(DBG_LVL_8, "Connection table Not occupied. \n");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* beiscsi_conn_stop - Invalidate and stop the connection
|
|
* @cls_conn: pointer to get iscsi_conn
|
|
* @flag: The type of connection closure
|
|
*/
|
|
void beiscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct beiscsi_conn *beiscsi_conn = conn->dd_data;
|
|
struct beiscsi_endpoint *beiscsi_ep;
|
|
struct iscsi_session *session = conn->session;
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
|
|
struct beiscsi_hba *phba = iscsi_host_priv(shost);
|
|
unsigned int status;
|
|
unsigned short savecfg_flag = CMD_ISCSI_SESSION_SAVE_CFG_ON_FLASH;
|
|
|
|
SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop\n");
|
|
beiscsi_ep = beiscsi_conn->ep;
|
|
if (!beiscsi_ep) {
|
|
SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop , no beiscsi_ep\n");
|
|
return;
|
|
}
|
|
status = mgmt_invalidate_connection(phba, beiscsi_ep,
|
|
beiscsi_ep->ep_cid, 1,
|
|
savecfg_flag);
|
|
if (status != MGMT_STATUS_SUCCESS) {
|
|
SE_DEBUG(DBG_LVL_1,
|
|
"mgmt_invalidate_connection Failed for cid=%d \n",
|
|
beiscsi_ep->ep_cid);
|
|
}
|
|
beiscsi_unbind_conn_to_cid(phba, beiscsi_ep->ep_cid);
|
|
iscsi_conn_stop(cls_conn, flag);
|
|
}
|