1e48354ceSNicholas Bellinger /******************************************************************************* 2e48354ceSNicholas Bellinger * This file contains the iSCSI Target specific Task Management functions. 3e48354ceSNicholas Bellinger * 4e48354ceSNicholas Bellinger * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5e48354ceSNicholas Bellinger * 6e48354ceSNicholas Bellinger * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7e48354ceSNicholas Bellinger * 8e48354ceSNicholas Bellinger * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9e48354ceSNicholas Bellinger * 10e48354ceSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 11e48354ceSNicholas Bellinger * it under the terms of the GNU General Public License as published by 12e48354ceSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 13e48354ceSNicholas Bellinger * (at your option) any later version. 14e48354ceSNicholas Bellinger * 15e48354ceSNicholas Bellinger * This program is distributed in the hope that it will be useful, 16e48354ceSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 17e48354ceSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18e48354ceSNicholas Bellinger * GNU General Public License for more details. 19e48354ceSNicholas Bellinger ******************************************************************************/ 20e48354ceSNicholas Bellinger 21e48354ceSNicholas Bellinger #include <asm/unaligned.h> 229f3eb93eSChristoph Hellwig #include <scsi/scsi_device.h> 23e48354ceSNicholas Bellinger #include <scsi/iscsi_proto.h> 24e48354ceSNicholas Bellinger #include <target/target_core_base.h> 25c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 26e48354ceSNicholas Bellinger 27e48354ceSNicholas Bellinger #include "iscsi_target_core.h" 28e48354ceSNicholas Bellinger #include "iscsi_target_seq_pdu_list.h" 29e48354ceSNicholas Bellinger #include "iscsi_target_datain_values.h" 30e48354ceSNicholas Bellinger #include "iscsi_target_device.h" 31e48354ceSNicholas Bellinger #include "iscsi_target_erl0.h" 32e48354ceSNicholas Bellinger #include "iscsi_target_erl1.h" 33e48354ceSNicholas Bellinger #include "iscsi_target_erl2.h" 34e48354ceSNicholas Bellinger #include "iscsi_target_tmr.h" 35e48354ceSNicholas Bellinger #include "iscsi_target_tpg.h" 36e48354ceSNicholas Bellinger #include "iscsi_target_util.h" 37e48354ceSNicholas Bellinger #include "iscsi_target.h" 38e48354ceSNicholas Bellinger 39e48354ceSNicholas Bellinger u8 iscsit_tmr_abort_task( 40e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 41e48354ceSNicholas Bellinger unsigned char *buf) 42e48354ceSNicholas Bellinger { 43e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd; 44e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 45e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 46e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 47e48354ceSNicholas Bellinger struct iscsi_tm *hdr = (struct iscsi_tm *) buf; 48e48354ceSNicholas Bellinger 49e48354ceSNicholas Bellinger ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt); 50e48354ceSNicholas Bellinger if (!ref_cmd) { 51e48354ceSNicholas Bellinger pr_err("Unable to locate RefTaskTag: 0x%08x on CID:" 52e48354ceSNicholas Bellinger " %hu.\n", hdr->rtt, conn->cid); 5350e5c87dSChristoph Hellwig return (be32_to_cpu(hdr->refcmdsn) >= conn->sess->exp_cmd_sn && 5450e5c87dSChristoph Hellwig be32_to_cpu(hdr->refcmdsn) <= conn->sess->max_cmd_sn) ? 55e48354ceSNicholas Bellinger ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK; 56e48354ceSNicholas Bellinger } 5750e5c87dSChristoph Hellwig if (ref_cmd->cmd_sn != be32_to_cpu(hdr->refcmdsn)) { 58e48354ceSNicholas Bellinger pr_err("RefCmdSN 0x%08x does not equal" 59e48354ceSNicholas Bellinger " task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n", 60e48354ceSNicholas Bellinger hdr->refcmdsn, ref_cmd->cmd_sn); 61e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 62e48354ceSNicholas Bellinger } 63e48354ceSNicholas Bellinger 6466c7db68SChristoph Hellwig se_tmr->ref_task_tag = (__force u32)hdr->rtt; 659f3eb93eSChristoph Hellwig tmr_req->ref_cmd = ref_cmd; 6650e5c87dSChristoph Hellwig tmr_req->exp_data_sn = be32_to_cpu(hdr->exp_datasn); 67e48354ceSNicholas Bellinger 68e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_COMPLETE; 69e48354ceSNicholas Bellinger } 70e48354ceSNicholas Bellinger 71e48354ceSNicholas Bellinger /* 72e48354ceSNicholas Bellinger * Called from iscsit_handle_task_mgt_cmd(). 73e48354ceSNicholas Bellinger */ 74e48354ceSNicholas Bellinger int iscsit_tmr_task_warm_reset( 75e48354ceSNicholas Bellinger struct iscsi_conn *conn, 76e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 77e48354ceSNicholas Bellinger unsigned char *buf) 78e48354ceSNicholas Bellinger { 79e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 80e48354ceSNicholas Bellinger struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 818b1e1244SAndy Grover 82e48354ceSNicholas Bellinger if (!na->tmr_warm_reset) { 83e48354ceSNicholas Bellinger pr_err("TMR Opcode TARGET_WARM_RESET authorization" 84e48354ceSNicholas Bellinger " failed for Initiator Node: %s\n", 85e48354ceSNicholas Bellinger sess->se_sess->se_node_acl->initiatorname); 86e48354ceSNicholas Bellinger return -1; 87e48354ceSNicholas Bellinger } 88e48354ceSNicholas Bellinger /* 89e48354ceSNicholas Bellinger * Do the real work in transport_generic_do_tmr(). 90e48354ceSNicholas Bellinger */ 91e48354ceSNicholas Bellinger return 0; 92e48354ceSNicholas Bellinger } 93e48354ceSNicholas Bellinger 94e48354ceSNicholas Bellinger int iscsit_tmr_task_cold_reset( 95e48354ceSNicholas Bellinger struct iscsi_conn *conn, 96e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 97e48354ceSNicholas Bellinger unsigned char *buf) 98e48354ceSNicholas Bellinger { 99e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 100e48354ceSNicholas Bellinger struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 101e48354ceSNicholas Bellinger 102e48354ceSNicholas Bellinger if (!na->tmr_cold_reset) { 103e48354ceSNicholas Bellinger pr_err("TMR Opcode TARGET_COLD_RESET authorization" 104e48354ceSNicholas Bellinger " failed for Initiator Node: %s\n", 105e48354ceSNicholas Bellinger sess->se_sess->se_node_acl->initiatorname); 106e48354ceSNicholas Bellinger return -1; 107e48354ceSNicholas Bellinger } 108e48354ceSNicholas Bellinger /* 109e48354ceSNicholas Bellinger * Do the real work in transport_generic_do_tmr(). 110e48354ceSNicholas Bellinger */ 111e48354ceSNicholas Bellinger return 0; 112e48354ceSNicholas Bellinger } 113e48354ceSNicholas Bellinger 114e48354ceSNicholas Bellinger u8 iscsit_tmr_task_reassign( 115e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 116e48354ceSNicholas Bellinger unsigned char *buf) 117e48354ceSNicholas Bellinger { 118e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd = NULL; 119e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 120e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr = NULL; 121e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 122e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 123e48354ceSNicholas Bellinger struct iscsi_tm *hdr = (struct iscsi_tm *) buf; 1249f3eb93eSChristoph Hellwig int ret, ref_lun; 125e48354ceSNicholas Bellinger 126e48354ceSNicholas Bellinger pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x," 127e48354ceSNicholas Bellinger " RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n", 128e48354ceSNicholas Bellinger hdr->itt, hdr->rtt, hdr->exp_datasn, conn->cid); 129e48354ceSNicholas Bellinger 130e48354ceSNicholas Bellinger if (conn->sess->sess_ops->ErrorRecoveryLevel != 2) { 131e48354ceSNicholas Bellinger pr_err("TMR TASK_REASSIGN not supported in ERL<2," 132e48354ceSNicholas Bellinger " ignoring request.\n"); 133e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_NOT_SUPPORTED; 134e48354ceSNicholas Bellinger } 135e48354ceSNicholas Bellinger 136e48354ceSNicholas Bellinger ret = iscsit_find_cmd_for_recovery(conn->sess, &ref_cmd, &cr, hdr->rtt); 137e48354ceSNicholas Bellinger if (ret == -2) { 138e48354ceSNicholas Bellinger pr_err("Command ITT: 0x%08x is still alligent to CID:" 139e48354ceSNicholas Bellinger " %hu\n", ref_cmd->init_task_tag, cr->cid); 140e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_TASK_ALLEGIANT; 141e48354ceSNicholas Bellinger } else if (ret == -1) { 142e48354ceSNicholas Bellinger pr_err("Unable to locate RefTaskTag: 0x%08x in" 143e48354ceSNicholas Bellinger " connection recovery command list.\n", hdr->rtt); 144e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_NO_TASK; 145e48354ceSNicholas Bellinger } 146e48354ceSNicholas Bellinger /* 147e48354ceSNicholas Bellinger * Temporary check to prevent connection recovery for 1481c417f39SNicholas Bellinger * connections with a differing Max*DataSegmentLength. 149e48354ceSNicholas Bellinger */ 150e48354ceSNicholas Bellinger if (cr->maxrecvdatasegmentlength != 151e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength) { 152e48354ceSNicholas Bellinger pr_err("Unable to perform connection recovery for" 153e48354ceSNicholas Bellinger " differing MaxRecvDataSegmentLength, rejecting" 154e48354ceSNicholas Bellinger " TMR TASK_REASSIGN.\n"); 155e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 156e48354ceSNicholas Bellinger } 1571c417f39SNicholas Bellinger if (cr->maxxmitdatasegmentlength != 1581c417f39SNicholas Bellinger conn->conn_ops->MaxXmitDataSegmentLength) { 1591c417f39SNicholas Bellinger pr_err("Unable to perform connection recovery for" 1601c417f39SNicholas Bellinger " differing MaxXmitDataSegmentLength, rejecting" 1611c417f39SNicholas Bellinger " TMR TASK_REASSIGN.\n"); 1621c417f39SNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 1631c417f39SNicholas Bellinger } 164e48354ceSNicholas Bellinger 1659f3eb93eSChristoph Hellwig ref_lun = scsilun_to_int(&hdr->lun); 1669f3eb93eSChristoph Hellwig if (ref_lun != ref_cmd->se_cmd.orig_fe_lun) { 1679f3eb93eSChristoph Hellwig pr_err("Unable to perform connection recovery for" 1689f3eb93eSChristoph Hellwig " differing ref_lun: %d ref_cmd orig_fe_lun: %u\n", 1699f3eb93eSChristoph Hellwig ref_lun, ref_cmd->se_cmd.orig_fe_lun); 1709f3eb93eSChristoph Hellwig return ISCSI_TMF_RSP_REJECTED; 1719f3eb93eSChristoph Hellwig } 1729f3eb93eSChristoph Hellwig 17366c7db68SChristoph Hellwig se_tmr->ref_task_tag = (__force u32)hdr->rtt; 1749f3eb93eSChristoph Hellwig tmr_req->ref_cmd = ref_cmd; 17550e5c87dSChristoph Hellwig tmr_req->exp_data_sn = be32_to_cpu(hdr->exp_datasn); 176e48354ceSNicholas Bellinger tmr_req->conn_recovery = cr; 177e48354ceSNicholas Bellinger tmr_req->task_reassign = 1; 178e48354ceSNicholas Bellinger /* 179e48354ceSNicholas Bellinger * Command can now be reassigned to a new connection. 180e48354ceSNicholas Bellinger * The task management response must be sent before the 181e48354ceSNicholas Bellinger * reassignment actually happens. See iscsi_tmr_post_handler(). 182e48354ceSNicholas Bellinger */ 183e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_COMPLETE; 184e48354ceSNicholas Bellinger } 185e48354ceSNicholas Bellinger 186e48354ceSNicholas Bellinger static void iscsit_task_reassign_remove_cmd( 187e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 188e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr, 189e48354ceSNicholas Bellinger struct iscsi_session *sess) 190e48354ceSNicholas Bellinger { 191e48354ceSNicholas Bellinger int ret; 192e48354ceSNicholas Bellinger 193e48354ceSNicholas Bellinger spin_lock(&cr->conn_recovery_cmd_lock); 194e48354ceSNicholas Bellinger ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess); 195e48354ceSNicholas Bellinger spin_unlock(&cr->conn_recovery_cmd_lock); 196e48354ceSNicholas Bellinger if (!ret) { 197e48354ceSNicholas Bellinger pr_debug("iSCSI connection recovery successful for CID:" 198e48354ceSNicholas Bellinger " %hu on SID: %u\n", cr->cid, sess->sid); 199e48354ceSNicholas Bellinger iscsit_remove_active_connection_recovery_entry(cr, sess); 200e48354ceSNicholas Bellinger } 201e48354ceSNicholas Bellinger } 202e48354ceSNicholas Bellinger 203e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_nop_out( 204e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 205e48354ceSNicholas Bellinger struct iscsi_conn *conn) 206e48354ceSNicholas Bellinger { 2079f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 208e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 209e48354ceSNicholas Bellinger 210e48354ceSNicholas Bellinger if (!cmd->cr) { 211e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 212e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 213e48354ceSNicholas Bellinger return -1; 214e48354ceSNicholas Bellinger } 215e48354ceSNicholas Bellinger cr = cmd->cr; 216e48354ceSNicholas Bellinger 217e48354ceSNicholas Bellinger /* 218e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 219e48354ceSNicholas Bellinger * will be assigned. 220e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 221e48354ceSNicholas Bellinger */ 222e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 223e48354ceSNicholas Bellinger 224e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 225e48354ceSNicholas Bellinger 226e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 2272fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 228e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 229e48354ceSNicholas Bellinger 230e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_NOPIN; 231e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 232e48354ceSNicholas Bellinger return 0; 233e48354ceSNicholas Bellinger } 234e48354ceSNicholas Bellinger 235e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_write( 236e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 237e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 238e48354ceSNicholas Bellinger { 239e48354ceSNicholas Bellinger int no_build_r2ts = 0; 240e48354ceSNicholas Bellinger u32 length = 0, offset = 0; 241e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 242e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 243e48354ceSNicholas Bellinger /* 244e48354ceSNicholas Bellinger * The Initiator must not send a R2T SNACK with a Begrun less than 245e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 246e48354ceSNicholas Bellinger */ 247e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 248e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 249e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 250e48354ceSNicholas Bellinger } else { 251e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 252e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 253e48354ceSNicholas Bellinger } 254e48354ceSNicholas Bellinger 255e48354ceSNicholas Bellinger /* 256e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the 257e48354ceSNicholas Bellinger * Initiator is expecting. The Target controls all WRITE operations 258e48354ceSNicholas Bellinger * so if we have received all DataOUT we can safety ignore Initiator. 259e48354ceSNicholas Bellinger */ 260e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 2617d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 262e48354ceSNicholas Bellinger pr_debug("WRITE ITT: 0x%08x: t_state: %d" 263e48354ceSNicholas Bellinger " never sent to transport\n", 264e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->se_cmd.t_state); 26567441b68SChristoph Hellwig target_execute_cmd(se_cmd); 26667441b68SChristoph Hellwig return 0; 267e48354ceSNicholas Bellinger } 268e48354ceSNicholas Bellinger 269e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 270e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 271e48354ceSNicholas Bellinger return 0; 272e48354ceSNicholas Bellinger } 273e48354ceSNicholas Bellinger 274e48354ceSNicholas Bellinger /* 275e48354ceSNicholas Bellinger * Special case to deal with DataSequenceInOrder=No and Non-Immeidate 276e48354ceSNicholas Bellinger * Unsolicited DataOut. 277e48354ceSNicholas Bellinger */ 278e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 279e48354ceSNicholas Bellinger cmd->unsolicited_data = 0; 280e48354ceSNicholas Bellinger 281e48354ceSNicholas Bellinger offset = cmd->next_burst_len = cmd->write_data_done; 282e48354ceSNicholas Bellinger 283e48354ceSNicholas Bellinger if ((conn->sess->sess_ops->FirstBurstLength - offset) >= 284ebf1d95cSAndy Grover cmd->se_cmd.data_length) { 285e48354ceSNicholas Bellinger no_build_r2ts = 1; 286ebf1d95cSAndy Grover length = (cmd->se_cmd.data_length - offset); 287e48354ceSNicholas Bellinger } else 288e48354ceSNicholas Bellinger length = (conn->sess->sess_ops->FirstBurstLength - offset); 289e48354ceSNicholas Bellinger 290e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 291e48354ceSNicholas Bellinger if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) { 292e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 293e48354ceSNicholas Bellinger return -1; 294e48354ceSNicholas Bellinger } 295e48354ceSNicholas Bellinger cmd->outstanding_r2ts++; 296e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 297e48354ceSNicholas Bellinger 298e48354ceSNicholas Bellinger if (no_build_r2ts) 299e48354ceSNicholas Bellinger return 0; 300e48354ceSNicholas Bellinger } 301e48354ceSNicholas Bellinger /* 302e48354ceSNicholas Bellinger * iscsit_build_r2ts_for_cmd() can handle the rest from here. 303e48354ceSNicholas Bellinger */ 3048b1e1244SAndy Grover return iscsit_build_r2ts_for_cmd(cmd, conn, true); 305e48354ceSNicholas Bellinger } 306e48354ceSNicholas Bellinger 307e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_read( 308e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 309e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 310e48354ceSNicholas Bellinger { 311e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 312e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 313e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 314e48354ceSNicholas Bellinger /* 315e48354ceSNicholas Bellinger * The Initiator must not send a Data SNACK with a BegRun less than 316e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 317e48354ceSNicholas Bellinger */ 318e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 319e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 320e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 321e48354ceSNicholas Bellinger } else { 322e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 323e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 324e48354ceSNicholas Bellinger } 325e48354ceSNicholas Bellinger 3267d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 327e48354ceSNicholas Bellinger pr_debug("READ ITT: 0x%08x: t_state: %d never sent to" 328e48354ceSNicholas Bellinger " transport\n", cmd->init_task_tag, 329e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 330acf3ecc4SChristoph Hellwig transport_handle_cdb_direct(se_cmd); 331e48354ceSNicholas Bellinger return 0; 332e48354ceSNicholas Bellinger } 333e48354ceSNicholas Bellinger 3347d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 335e48354ceSNicholas Bellinger pr_err("READ ITT: 0x%08x: t_state: %d, never returned" 336e48354ceSNicholas Bellinger " from transport\n", cmd->init_task_tag, 337e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 338e48354ceSNicholas Bellinger return -1; 339e48354ceSNicholas Bellinger } 340e48354ceSNicholas Bellinger 341e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 342e48354ceSNicholas Bellinger if (!dr) 343e48354ceSNicholas Bellinger return -1; 344e48354ceSNicholas Bellinger /* 345e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the 346e48354ceSNicholas Bellinger * Initiator is expecting. 347e48354ceSNicholas Bellinger */ 348e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = tmr_req->exp_data_sn; 349e48354ceSNicholas Bellinger dr->runlength = 0; 350e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 351e48354ceSNicholas Bellinger dr->recovery = DATAIN_CONNECTION_RECOVERY; 352e48354ceSNicholas Bellinger 353e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 354e48354ceSNicholas Bellinger 355e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 356e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 357e48354ceSNicholas Bellinger return 0; 358e48354ceSNicholas Bellinger } 359e48354ceSNicholas Bellinger 360e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_none( 361e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 362e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 363e48354ceSNicholas Bellinger { 364e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 365e48354ceSNicholas Bellinger 366e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 367e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 368e48354ceSNicholas Bellinger return 0; 369e48354ceSNicholas Bellinger } 370e48354ceSNicholas Bellinger 371e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_scsi_cmnd( 372e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 373e48354ceSNicholas Bellinger struct iscsi_conn *conn) 374e48354ceSNicholas Bellinger { 3759f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 376e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 377e48354ceSNicholas Bellinger 378e48354ceSNicholas Bellinger if (!cmd->cr) { 379e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 380e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 381e48354ceSNicholas Bellinger return -1; 382e48354ceSNicholas Bellinger } 383e48354ceSNicholas Bellinger cr = cmd->cr; 384e48354ceSNicholas Bellinger 385e48354ceSNicholas Bellinger /* 386e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 387e48354ceSNicholas Bellinger * will be assigned. 388e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 389e48354ceSNicholas Bellinger */ 390e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 391e48354ceSNicholas Bellinger 392e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 393e48354ceSNicholas Bellinger 394e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 3952fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 396e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 397e48354ceSNicholas Bellinger 3989f3eb93eSChristoph Hellwig if (cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 399e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 400e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 401e48354ceSNicholas Bellinger return 0; 402e48354ceSNicholas Bellinger } 403e48354ceSNicholas Bellinger 404e48354ceSNicholas Bellinger switch (cmd->data_direction) { 405e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 406e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_write(cmd, tmr_req); 407e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 408e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_read(cmd, tmr_req); 409e48354ceSNicholas Bellinger case DMA_NONE: 410e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_none(cmd, tmr_req); 411e48354ceSNicholas Bellinger default: 412e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 413e48354ceSNicholas Bellinger cmd->data_direction); 414e48354ceSNicholas Bellinger return -1; 415e48354ceSNicholas Bellinger } 416e48354ceSNicholas Bellinger 417e48354ceSNicholas Bellinger return 0; 418e48354ceSNicholas Bellinger } 419e48354ceSNicholas Bellinger 420e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete( 421e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 422e48354ceSNicholas Bellinger struct iscsi_conn *conn) 423e48354ceSNicholas Bellinger { 424e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 425e48354ceSNicholas Bellinger int ret = 0; 426e48354ceSNicholas Bellinger 4279f3eb93eSChristoph Hellwig if (!tmr_req->ref_cmd) { 428e48354ceSNicholas Bellinger pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n"); 429e48354ceSNicholas Bellinger return -1; 430e48354ceSNicholas Bellinger } 4319f3eb93eSChristoph Hellwig cmd = tmr_req->ref_cmd; 432e48354ceSNicholas Bellinger 433e48354ceSNicholas Bellinger cmd->conn = conn; 434e48354ceSNicholas Bellinger 435e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 436e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 437e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn); 438e48354ceSNicholas Bellinger break; 439e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 440e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn); 441e48354ceSNicholas Bellinger break; 442e48354ceSNicholas Bellinger default: 443e48354ceSNicholas Bellinger pr_err("Illegal iSCSI Opcode 0x%02x during" 444e48354ceSNicholas Bellinger " command realligence\n", cmd->iscsi_opcode); 445e48354ceSNicholas Bellinger return -1; 446e48354ceSNicholas Bellinger } 447e48354ceSNicholas Bellinger 448e48354ceSNicholas Bellinger if (ret != 0) 449e48354ceSNicholas Bellinger return ret; 450e48354ceSNicholas Bellinger 451e48354ceSNicholas Bellinger pr_debug("Completed connection realligence for Opcode: 0x%02x," 452e48354ceSNicholas Bellinger " ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode, 453e48354ceSNicholas Bellinger cmd->init_task_tag, conn->cid); 454e48354ceSNicholas Bellinger 455e48354ceSNicholas Bellinger return 0; 456e48354ceSNicholas Bellinger } 457e48354ceSNicholas Bellinger 458e48354ceSNicholas Bellinger /* 459e48354ceSNicholas Bellinger * Handles special after-the-fact actions related to TMRs. 460e48354ceSNicholas Bellinger * Right now the only one that its really needed for is 461e48354ceSNicholas Bellinger * connection recovery releated TASK_REASSIGN. 462e48354ceSNicholas Bellinger */ 463fceb5bc7SChristoph Hellwig int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 464e48354ceSNicholas Bellinger { 465e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 466e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 467e48354ceSNicholas Bellinger 468e48354ceSNicholas Bellinger if (tmr_req->task_reassign && 469e48354ceSNicholas Bellinger (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 470e48354ceSNicholas Bellinger return iscsit_task_reassign_complete(tmr_req, conn); 471e48354ceSNicholas Bellinger 472e48354ceSNicholas Bellinger return 0; 473e48354ceSNicholas Bellinger } 474e48354ceSNicholas Bellinger 475e48354ceSNicholas Bellinger /* 476e48354ceSNicholas Bellinger * Nothing to do here, but leave it for good measure. :-) 477e48354ceSNicholas Bellinger */ 478fceb5bc7SChristoph Hellwig static int iscsit_task_reassign_prepare_read( 479e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 480e48354ceSNicholas Bellinger struct iscsi_conn *conn) 481e48354ceSNicholas Bellinger { 482e48354ceSNicholas Bellinger return 0; 483e48354ceSNicholas Bellinger } 484e48354ceSNicholas Bellinger 485e48354ceSNicholas Bellinger static void iscsit_task_reassign_prepare_unsolicited_dataout( 486e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 487e48354ceSNicholas Bellinger struct iscsi_conn *conn) 488e48354ceSNicholas Bellinger { 489e48354ceSNicholas Bellinger int i, j; 490e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 491e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 492e48354ceSNicholas Bellinger 493e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 494e48354ceSNicholas Bellinger cmd->data_sn = 0; 495e48354ceSNicholas Bellinger 496e48354ceSNicholas Bellinger if (cmd->immediate_data) 497e48354ceSNicholas Bellinger cmd->r2t_offset += (cmd->first_burst_len - 498e48354ceSNicholas Bellinger cmd->seq_start_offset); 499e48354ceSNicholas Bellinger 500e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 501e48354ceSNicholas Bellinger cmd->write_data_done -= (cmd->immediate_data) ? 502e48354ceSNicholas Bellinger (cmd->first_burst_len - 503e48354ceSNicholas Bellinger cmd->seq_start_offset) : 504e48354ceSNicholas Bellinger cmd->first_burst_len; 505e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 506e48354ceSNicholas Bellinger return; 507e48354ceSNicholas Bellinger } 508e48354ceSNicholas Bellinger 509e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 510e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 511e48354ceSNicholas Bellinger 512e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 513e48354ceSNicholas Bellinger continue; 514e48354ceSNicholas Bellinger 515e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 516e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 517e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 518e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 519e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 520e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 521e48354ceSNicholas Bellinger } 522e48354ceSNicholas Bellinger } 523e48354ceSNicholas Bellinger } else { 524e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 525e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 526e48354ceSNicholas Bellinger 527e48354ceSNicholas Bellinger if (seq->type != SEQTYPE_UNSOLICITED) 528e48354ceSNicholas Bellinger continue; 529e48354ceSNicholas Bellinger 530e48354ceSNicholas Bellinger cmd->write_data_done -= 531e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 532e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 533e48354ceSNicholas Bellinger seq->data_sn = 0; 534e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 535e48354ceSNicholas Bellinger seq->next_burst_len = 0; 536e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 537e48354ceSNicholas Bellinger 538e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 539e48354ceSNicholas Bellinger continue; 540e48354ceSNicholas Bellinger 541e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 542e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[j+seq->pdu_start]; 543e48354ceSNicholas Bellinger 544e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 545e48354ceSNicholas Bellinger continue; 546e48354ceSNicholas Bellinger 547e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 548e48354ceSNicholas Bellinger } 549e48354ceSNicholas Bellinger } 550e48354ceSNicholas Bellinger } 551e48354ceSNicholas Bellinger } 552e48354ceSNicholas Bellinger 553fceb5bc7SChristoph Hellwig static int iscsit_task_reassign_prepare_write( 554e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 555e48354ceSNicholas Bellinger struct iscsi_conn *conn) 556e48354ceSNicholas Bellinger { 5579f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 558e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 559e48354ceSNicholas Bellinger struct iscsi_r2t *r2t = NULL, *r2t_tmp; 560e48354ceSNicholas Bellinger int first_incomplete_r2t = 1, i = 0; 561e48354ceSNicholas Bellinger 562e48354ceSNicholas Bellinger /* 563e48354ceSNicholas Bellinger * The command was in the process of receiving Unsolicited DataOUT when 564e48354ceSNicholas Bellinger * the connection failed. 565e48354ceSNicholas Bellinger */ 566e48354ceSNicholas Bellinger if (cmd->unsolicited_data) 567e48354ceSNicholas Bellinger iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn); 568e48354ceSNicholas Bellinger 569e48354ceSNicholas Bellinger /* 570e48354ceSNicholas Bellinger * The Initiator is requesting R2Ts starting from zero, skip 571e48354ceSNicholas Bellinger * checking acknowledged R2Ts and start checking struct iscsi_r2ts 572e48354ceSNicholas Bellinger * greater than zero. 573e48354ceSNicholas Bellinger */ 574e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) 575e48354ceSNicholas Bellinger goto drop_unacknowledged_r2ts; 576e48354ceSNicholas Bellinger 577e48354ceSNicholas Bellinger /* 578e48354ceSNicholas Bellinger * We now check that the PDUs in DataOUT sequences below 579e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is 580e48354ceSNicholas Bellinger * expecting next) have all the DataOUT they require to complete 581e48354ceSNicholas Bellinger * the DataOUT sequence. First scan from R2TSN 0 to TMR 582e48354ceSNicholas Bellinger * TASK_REASSIGN ExpDataSN-1. 583e48354ceSNicholas Bellinger * 584e48354ceSNicholas Bellinger * If we have not received all DataOUT in question, we must 585e48354ceSNicholas Bellinger * make sure to make the appropriate changes to values in 586e48354ceSNicholas Bellinger * struct iscsi_cmd (and elsewhere depending on session parameters) 587e48354ceSNicholas Bellinger * so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write() 588e48354ceSNicholas Bellinger * will resend a new R2T for the DataOUT sequences in question. 589e48354ceSNicholas Bellinger */ 590e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 591e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 592e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 593e48354ceSNicholas Bellinger return -1; 594e48354ceSNicholas Bellinger } 595e48354ceSNicholas Bellinger 596e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 597e48354ceSNicholas Bellinger 598e48354ceSNicholas Bellinger if (r2t->r2t_sn >= tmr_req->exp_data_sn) 599e48354ceSNicholas Bellinger continue; 600e48354ceSNicholas Bellinger /* 601e48354ceSNicholas Bellinger * Safely ignore Recovery R2Ts and R2Ts that have completed 602e48354ceSNicholas Bellinger * DataOUT sequences. 603e48354ceSNicholas Bellinger */ 604e48354ceSNicholas Bellinger if (r2t->seq_complete) 605e48354ceSNicholas Bellinger continue; 606e48354ceSNicholas Bellinger 607e48354ceSNicholas Bellinger if (r2t->recovery_r2t) 608e48354ceSNicholas Bellinger continue; 609e48354ceSNicholas Bellinger 610e48354ceSNicholas Bellinger /* 611e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes: 612e48354ceSNicholas Bellinger * 613e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 614e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 615e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, we must take into consideration 616e48354ceSNicholas Bellinger * the following: 617e48354ceSNicholas Bellinger * 618e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 619e48354ceSNicholas Bellinger * 620e48354ceSNicholas Bellinger * Taking into account that the Initiator controls the (possibly 621e48354ceSNicholas Bellinger * random) PDU Order in (possibly random) Sequence Order of 622e48354ceSNicholas Bellinger * DataOUT the target requests with R2Ts, we must take into 623e48354ceSNicholas Bellinger * consideration the following: 624e48354ceSNicholas Bellinger * 625e48354ceSNicholas Bellinger * DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]: 626e48354ceSNicholas Bellinger * 627e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 628e48354ceSNicholas Bellinger * the Target will re-request only the total sequence length 629e48354ceSNicholas Bellinger * minus current received offset. This is because we must 630e48354ceSNicholas Bellinger * assume the initiator will continue sending DataOUT from the 631e48354ceSNicholas Bellinger * last PDU before the connection failed. 632e48354ceSNicholas Bellinger * 633e48354ceSNicholas Bellinger * DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]: 634e48354ceSNicholas Bellinger * 635e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 636e48354ceSNicholas Bellinger * the Target will re-request the entire DataOUT sequence if 637e48354ceSNicholas Bellinger * any single PDU is missing from the sequence. This is because 638e48354ceSNicholas Bellinger * we have no logical method to determine the next PDU offset, 639e48354ceSNicholas Bellinger * and we must assume the Initiator will be sending any random 640e48354ceSNicholas Bellinger * PDU offset in the current sequence after TASK_REASSIGN 641e48354ceSNicholas Bellinger * has completed. 642e48354ceSNicholas Bellinger */ 643e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 644e48354ceSNicholas Bellinger if (!first_incomplete_r2t) { 645e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 646e48354ceSNicholas Bellinger goto next; 647e48354ceSNicholas Bellinger } 648e48354ceSNicholas Bellinger 649e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 650e48354ceSNicholas Bellinger cmd->data_sn = 0; 651e48354ceSNicholas Bellinger cmd->r2t_offset -= (r2t->xfer_len - 652e48354ceSNicholas Bellinger cmd->next_burst_len); 653e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 654e48354ceSNicholas Bellinger goto next; 655e48354ceSNicholas Bellinger } 656e48354ceSNicholas Bellinger 657e48354ceSNicholas Bellinger cmd->data_sn = 0; 658e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 659e48354ceSNicholas Bellinger 660e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 661e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 662e48354ceSNicholas Bellinger 663e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 664e48354ceSNicholas Bellinger continue; 665e48354ceSNicholas Bellinger 666e48354ceSNicholas Bellinger if ((pdu->offset >= r2t->offset) && 667e48354ceSNicholas Bellinger (pdu->offset < (r2t->offset + 668e48354ceSNicholas Bellinger r2t->xfer_len))) { 669e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 670e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 671e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 672e48354ceSNicholas Bellinger } 673e48354ceSNicholas Bellinger } 674e48354ceSNicholas Bellinger 675e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 676e48354ceSNicholas Bellinger } else { 677e48354ceSNicholas Bellinger struct iscsi_seq *seq; 678e48354ceSNicholas Bellinger 679e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, r2t->offset, 680e48354ceSNicholas Bellinger r2t->xfer_len); 681e48354ceSNicholas Bellinger if (!seq) { 682e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 683e48354ceSNicholas Bellinger return -1; 684e48354ceSNicholas Bellinger } 685e48354ceSNicholas Bellinger 686e48354ceSNicholas Bellinger cmd->write_data_done -= 687e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 688e48354ceSNicholas Bellinger seq->data_sn = 0; 689e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 690e48354ceSNicholas Bellinger seq->next_burst_len = 0; 691e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 692e48354ceSNicholas Bellinger 693e48354ceSNicholas Bellinger cmd->seq_send_order--; 694e48354ceSNicholas Bellinger 695e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 696e48354ceSNicholas Bellinger goto next; 697e48354ceSNicholas Bellinger 698e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 699e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 700e48354ceSNicholas Bellinger 701e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 702e48354ceSNicholas Bellinger continue; 703e48354ceSNicholas Bellinger 704e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 705e48354ceSNicholas Bellinger } 706e48354ceSNicholas Bellinger } 707e48354ceSNicholas Bellinger 708e48354ceSNicholas Bellinger next: 709e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 710e48354ceSNicholas Bellinger } 711e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 712e48354ceSNicholas Bellinger 713e48354ceSNicholas Bellinger /* 714e48354ceSNicholas Bellinger * We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR 715e48354ceSNicholas Bellinger * TASK_REASSIGN to the last R2T in the list.. We are also careful 716e48354ceSNicholas Bellinger * to check that the Initiator is not requesting R2Ts for DataOUT 717e48354ceSNicholas Bellinger * sequences it has already completed. 718e48354ceSNicholas Bellinger * 719e48354ceSNicholas Bellinger * Free each R2T in question and adjust values in struct iscsi_cmd 720e48354ceSNicholas Bellinger * accordingly so iscsit_build_r2ts_for_cmd() do the rest of 721e48354ceSNicholas Bellinger * the work after the TMR TASK_REASSIGN Response is sent. 722e48354ceSNicholas Bellinger */ 723e48354ceSNicholas Bellinger drop_unacknowledged_r2ts: 724e48354ceSNicholas Bellinger 725e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_SENT_LAST_R2T; 726e48354ceSNicholas Bellinger cmd->r2t_sn = tmr_req->exp_data_sn; 727e48354ceSNicholas Bellinger 728e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 729e48354ceSNicholas Bellinger list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { 730e48354ceSNicholas Bellinger /* 731e48354ceSNicholas Bellinger * Skip up to the R2T Sequence number provided by the 732e48354ceSNicholas Bellinger * iSCSI TASK_REASSIGN TMR 733e48354ceSNicholas Bellinger */ 734e48354ceSNicholas Bellinger if (r2t->r2t_sn < tmr_req->exp_data_sn) 735e48354ceSNicholas Bellinger continue; 736e48354ceSNicholas Bellinger 737e48354ceSNicholas Bellinger if (r2t->seq_complete) { 738e48354ceSNicholas Bellinger pr_err("Initiator is requesting R2Ts from" 739e48354ceSNicholas Bellinger " R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u," 740e48354ceSNicholas Bellinger " Length: %u is already complete." 741e48354ceSNicholas Bellinger " BAD INITIATOR ERL=2 IMPLEMENTATION!\n", 742e48354ceSNicholas Bellinger tmr_req->exp_data_sn, r2t->r2t_sn, 743e48354ceSNicholas Bellinger r2t->offset, r2t->xfer_len); 744e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 745e48354ceSNicholas Bellinger return -1; 746e48354ceSNicholas Bellinger } 747e48354ceSNicholas Bellinger 748e48354ceSNicholas Bellinger if (r2t->recovery_r2t) { 749e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 750e48354ceSNicholas Bellinger continue; 751e48354ceSNicholas Bellinger } 752e48354ceSNicholas Bellinger 753e48354ceSNicholas Bellinger /* DataSequenceInOrder=Yes: 754e48354ceSNicholas Bellinger * 755e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 756e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 757e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, it's safe to subtract the R2Ts 758e48354ceSNicholas Bellinger * entire transfer length from the commands R2T offset marker. 759e48354ceSNicholas Bellinger * 760e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 761e48354ceSNicholas Bellinger * 762e48354ceSNicholas Bellinger * We subtract the difference from struct iscsi_seq between the 763e48354ceSNicholas Bellinger * current offset and original offset from cmd->write_data_done 764e48354ceSNicholas Bellinger * for account for DataOUT PDUs already received. Then reset 765e48354ceSNicholas Bellinger * the current offset to the original and zero out the current 766e48354ceSNicholas Bellinger * burst length, to make sure we re-request the entire DataOUT 767e48354ceSNicholas Bellinger * sequence. 768e48354ceSNicholas Bellinger */ 769e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) 770e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 771e48354ceSNicholas Bellinger else 772e48354ceSNicholas Bellinger cmd->seq_send_order--; 773e48354ceSNicholas Bellinger 774e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 775e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 776e48354ceSNicholas Bellinger } 777e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 778e48354ceSNicholas Bellinger 779e48354ceSNicholas Bellinger return 0; 780e48354ceSNicholas Bellinger } 781e48354ceSNicholas Bellinger 782e48354ceSNicholas Bellinger /* 783e48354ceSNicholas Bellinger * Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for 784e48354ceSNicholas Bellinger * a given struct iscsi_cmd. 785e48354ceSNicholas Bellinger */ 786e48354ceSNicholas Bellinger int iscsit_check_task_reassign_expdatasn( 787e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 788e48354ceSNicholas Bellinger struct iscsi_conn *conn) 789e48354ceSNicholas Bellinger { 7909f3eb93eSChristoph Hellwig struct iscsi_cmd *ref_cmd = tmr_req->ref_cmd; 791e48354ceSNicholas Bellinger 792e48354ceSNicholas Bellinger if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) 793e48354ceSNicholas Bellinger return 0; 794e48354ceSNicholas Bellinger 7959f3eb93eSChristoph Hellwig if (ref_cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) 796e48354ceSNicholas Bellinger return 0; 797e48354ceSNicholas Bellinger 798e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_NONE) 799e48354ceSNicholas Bellinger return 0; 800e48354ceSNicholas Bellinger 801e48354ceSNicholas Bellinger /* 802e48354ceSNicholas Bellinger * For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN 803e48354ceSNicholas Bellinger * of DataIN the Initiator is expecting. 804e48354ceSNicholas Bellinger * 805e48354ceSNicholas Bellinger * Also check that the Initiator is not re-requesting DataIN that has 806e48354ceSNicholas Bellinger * already been acknowledged with a DataAck SNACK. 807e48354ceSNicholas Bellinger */ 808e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_FROM_DEVICE) { 809e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->data_sn) { 810e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 811e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 812e48354ceSNicholas Bellinger " DataSN: 0x%08x.\n", tmr_req->exp_data_sn, 813e48354ceSNicholas Bellinger ref_cmd->data_sn); 814e48354ceSNicholas Bellinger return -1; 815e48354ceSNicholas Bellinger } 816e48354ceSNicholas Bellinger if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 817e48354ceSNicholas Bellinger (tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) { 818e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 819e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN for previously" 820e48354ceSNicholas Bellinger " acknowledged DataIN: 0x%08x," 821e48354ceSNicholas Bellinger " protocol error\n", tmr_req->exp_data_sn, 822e48354ceSNicholas Bellinger ref_cmd->acked_data_sn); 823e48354ceSNicholas Bellinger return -1; 824e48354ceSNicholas Bellinger } 825e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_read(tmr_req, conn); 826e48354ceSNicholas Bellinger } 827e48354ceSNicholas Bellinger 828e48354ceSNicholas Bellinger /* 829e48354ceSNicholas Bellinger * For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN 830e48354ceSNicholas Bellinger * for R2Ts the Initiator is expecting. 831e48354ceSNicholas Bellinger * 832e48354ceSNicholas Bellinger * Do the magic in iscsit_task_reassign_prepare_write(). 833e48354ceSNicholas Bellinger */ 834e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_TO_DEVICE) { 835e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) { 836e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for WRITE" 837e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 838e48354ceSNicholas Bellinger " R2TSN: 0x%08x.\n", tmr_req->exp_data_sn, 839e48354ceSNicholas Bellinger ref_cmd->r2t_sn); 840e48354ceSNicholas Bellinger return -1; 841e48354ceSNicholas Bellinger } 842e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_write(tmr_req, conn); 843e48354ceSNicholas Bellinger } 844e48354ceSNicholas Bellinger 845e48354ceSNicholas Bellinger pr_err("Unknown iSCSI data_direction: 0x%02x\n", 846e48354ceSNicholas Bellinger ref_cmd->data_direction); 847e48354ceSNicholas Bellinger 848e48354ceSNicholas Bellinger return -1; 849e48354ceSNicholas Bellinger } 850