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> 22e48354ceSNicholas Bellinger #include <scsi/iscsi_proto.h> 23e48354ceSNicholas Bellinger #include <target/target_core_base.h> 24c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 25e48354ceSNicholas Bellinger 26e48354ceSNicholas Bellinger #include "iscsi_target_core.h" 27e48354ceSNicholas Bellinger #include "iscsi_target_seq_pdu_list.h" 28e48354ceSNicholas Bellinger #include "iscsi_target_datain_values.h" 29e48354ceSNicholas Bellinger #include "iscsi_target_device.h" 30e48354ceSNicholas Bellinger #include "iscsi_target_erl0.h" 31e48354ceSNicholas Bellinger #include "iscsi_target_erl1.h" 32e48354ceSNicholas Bellinger #include "iscsi_target_erl2.h" 33e48354ceSNicholas Bellinger #include "iscsi_target_tmr.h" 34e48354ceSNicholas Bellinger #include "iscsi_target_tpg.h" 35e48354ceSNicholas Bellinger #include "iscsi_target_util.h" 36e48354ceSNicholas Bellinger #include "iscsi_target.h" 37e48354ceSNicholas Bellinger 38e48354ceSNicholas Bellinger u8 iscsit_tmr_abort_task( 39e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 40e48354ceSNicholas Bellinger unsigned char *buf) 41e48354ceSNicholas Bellinger { 42e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd; 43e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 44e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 45e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 46e48354ceSNicholas Bellinger struct iscsi_tm *hdr = (struct iscsi_tm *) buf; 47e48354ceSNicholas Bellinger 48e48354ceSNicholas Bellinger ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt); 49e48354ceSNicholas Bellinger if (!ref_cmd) { 50e48354ceSNicholas Bellinger pr_err("Unable to locate RefTaskTag: 0x%08x on CID:" 51e48354ceSNicholas Bellinger " %hu.\n", hdr->rtt, conn->cid); 52e48354ceSNicholas Bellinger return ((hdr->refcmdsn >= conn->sess->exp_cmd_sn) && 53e48354ceSNicholas Bellinger (hdr->refcmdsn <= conn->sess->max_cmd_sn)) ? 54e48354ceSNicholas Bellinger ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK; 55e48354ceSNicholas Bellinger } 56e48354ceSNicholas Bellinger if (ref_cmd->cmd_sn != hdr->refcmdsn) { 57e48354ceSNicholas Bellinger pr_err("RefCmdSN 0x%08x does not equal" 58e48354ceSNicholas Bellinger " task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n", 59e48354ceSNicholas Bellinger hdr->refcmdsn, ref_cmd->cmd_sn); 60e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 61e48354ceSNicholas Bellinger } 62e48354ceSNicholas Bellinger 63e48354ceSNicholas Bellinger se_tmr->ref_task_tag = hdr->rtt; 64e48354ceSNicholas Bellinger se_tmr->ref_cmd = &ref_cmd->se_cmd; 65e48354ceSNicholas Bellinger tmr_req->ref_cmd_sn = hdr->refcmdsn; 66e48354ceSNicholas Bellinger tmr_req->exp_data_sn = 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; 124e48354ceSNicholas Bellinger int ret; 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 148e48354ceSNicholas Bellinger * connections with a differing MaxRecvDataSegmentLength. 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 } 157e48354ceSNicholas Bellinger 158e48354ceSNicholas Bellinger se_tmr->ref_task_tag = hdr->rtt; 159e48354ceSNicholas Bellinger se_tmr->ref_cmd = &ref_cmd->se_cmd; 160e48354ceSNicholas Bellinger se_tmr->ref_task_lun = get_unaligned_le64(&hdr->lun); 161e48354ceSNicholas Bellinger tmr_req->ref_cmd_sn = hdr->refcmdsn; 162e48354ceSNicholas Bellinger tmr_req->exp_data_sn = hdr->exp_datasn; 163e48354ceSNicholas Bellinger tmr_req->conn_recovery = cr; 164e48354ceSNicholas Bellinger tmr_req->task_reassign = 1; 165e48354ceSNicholas Bellinger /* 166e48354ceSNicholas Bellinger * Command can now be reassigned to a new connection. 167e48354ceSNicholas Bellinger * The task management response must be sent before the 168e48354ceSNicholas Bellinger * reassignment actually happens. See iscsi_tmr_post_handler(). 169e48354ceSNicholas Bellinger */ 170e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_COMPLETE; 171e48354ceSNicholas Bellinger } 172e48354ceSNicholas Bellinger 173e48354ceSNicholas Bellinger static void iscsit_task_reassign_remove_cmd( 174e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 175e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr, 176e48354ceSNicholas Bellinger struct iscsi_session *sess) 177e48354ceSNicholas Bellinger { 178e48354ceSNicholas Bellinger int ret; 179e48354ceSNicholas Bellinger 180e48354ceSNicholas Bellinger spin_lock(&cr->conn_recovery_cmd_lock); 181e48354ceSNicholas Bellinger ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess); 182e48354ceSNicholas Bellinger spin_unlock(&cr->conn_recovery_cmd_lock); 183e48354ceSNicholas Bellinger if (!ret) { 184e48354ceSNicholas Bellinger pr_debug("iSCSI connection recovery successful for CID:" 185e48354ceSNicholas Bellinger " %hu on SID: %u\n", cr->cid, sess->sid); 186e48354ceSNicholas Bellinger iscsit_remove_active_connection_recovery_entry(cr, sess); 187e48354ceSNicholas Bellinger } 188e48354ceSNicholas Bellinger } 189e48354ceSNicholas Bellinger 190e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_nop_out( 191e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 192e48354ceSNicholas Bellinger struct iscsi_conn *conn) 193e48354ceSNicholas Bellinger { 194e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; 195e48354ceSNicholas Bellinger struct se_cmd *se_cmd = se_tmr->ref_cmd; 196e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); 197e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 198e48354ceSNicholas Bellinger 199e48354ceSNicholas Bellinger if (!cmd->cr) { 200e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 201e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 202e48354ceSNicholas Bellinger return -1; 203e48354ceSNicholas Bellinger } 204e48354ceSNicholas Bellinger cr = cmd->cr; 205e48354ceSNicholas Bellinger 206e48354ceSNicholas Bellinger /* 207e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 208e48354ceSNicholas Bellinger * will be assigned. 209e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 210e48354ceSNicholas Bellinger */ 211e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 212e48354ceSNicholas Bellinger 213e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 214e48354ceSNicholas Bellinger 215e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 2162fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 217e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 218e48354ceSNicholas Bellinger 219e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_NOPIN; 220e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 221e48354ceSNicholas Bellinger return 0; 222e48354ceSNicholas Bellinger } 223e48354ceSNicholas Bellinger 224e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_write( 225e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 226e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 227e48354ceSNicholas Bellinger { 228e48354ceSNicholas Bellinger int no_build_r2ts = 0; 229e48354ceSNicholas Bellinger u32 length = 0, offset = 0; 230e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 231e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 232e48354ceSNicholas Bellinger /* 233e48354ceSNicholas Bellinger * The Initiator must not send a R2T SNACK with a Begrun less than 234e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 235e48354ceSNicholas Bellinger */ 236e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 237e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 238e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 239e48354ceSNicholas Bellinger } else { 240e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 241e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 242e48354ceSNicholas Bellinger } 243e48354ceSNicholas Bellinger 244e48354ceSNicholas Bellinger /* 245e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the 246e48354ceSNicholas Bellinger * Initiator is expecting. The Target controls all WRITE operations 247e48354ceSNicholas Bellinger * so if we have received all DataOUT we can safety ignore Initiator. 248e48354ceSNicholas Bellinger */ 249e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 2507d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 251e48354ceSNicholas Bellinger pr_debug("WRITE ITT: 0x%08x: t_state: %d" 252e48354ceSNicholas Bellinger " never sent to transport\n", 253e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->se_cmd.t_state); 254e48354ceSNicholas Bellinger return transport_generic_handle_data(se_cmd); 255e48354ceSNicholas Bellinger } 256e48354ceSNicholas Bellinger 257e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 258e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 259e48354ceSNicholas Bellinger return 0; 260e48354ceSNicholas Bellinger } 261e48354ceSNicholas Bellinger 262e48354ceSNicholas Bellinger /* 263e48354ceSNicholas Bellinger * Special case to deal with DataSequenceInOrder=No and Non-Immeidate 264e48354ceSNicholas Bellinger * Unsolicited DataOut. 265e48354ceSNicholas Bellinger */ 266e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 267e48354ceSNicholas Bellinger cmd->unsolicited_data = 0; 268e48354ceSNicholas Bellinger 269e48354ceSNicholas Bellinger offset = cmd->next_burst_len = cmd->write_data_done; 270e48354ceSNicholas Bellinger 271e48354ceSNicholas Bellinger if ((conn->sess->sess_ops->FirstBurstLength - offset) >= 272ebf1d95cSAndy Grover cmd->se_cmd.data_length) { 273e48354ceSNicholas Bellinger no_build_r2ts = 1; 274ebf1d95cSAndy Grover length = (cmd->se_cmd.data_length - offset); 275e48354ceSNicholas Bellinger } else 276e48354ceSNicholas Bellinger length = (conn->sess->sess_ops->FirstBurstLength - offset); 277e48354ceSNicholas Bellinger 278e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 279e48354ceSNicholas Bellinger if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) { 280e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 281e48354ceSNicholas Bellinger return -1; 282e48354ceSNicholas Bellinger } 283e48354ceSNicholas Bellinger cmd->outstanding_r2ts++; 284e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 285e48354ceSNicholas Bellinger 286e48354ceSNicholas Bellinger if (no_build_r2ts) 287e48354ceSNicholas Bellinger return 0; 288e48354ceSNicholas Bellinger } 289e48354ceSNicholas Bellinger /* 290e48354ceSNicholas Bellinger * iscsit_build_r2ts_for_cmd() can handle the rest from here. 291e48354ceSNicholas Bellinger */ 2928b1e1244SAndy Grover return iscsit_build_r2ts_for_cmd(cmd, conn, true); 293e48354ceSNicholas Bellinger } 294e48354ceSNicholas Bellinger 295e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_read( 296e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 297e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 298e48354ceSNicholas Bellinger { 299e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 300e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 301e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 302e48354ceSNicholas Bellinger /* 303e48354ceSNicholas Bellinger * The Initiator must not send a Data SNACK with a BegRun less than 304e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 305e48354ceSNicholas Bellinger */ 306e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 307e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 308e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 309e48354ceSNicholas Bellinger } else { 310e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 311e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 312e48354ceSNicholas Bellinger } 313e48354ceSNicholas Bellinger 3147d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 315e48354ceSNicholas Bellinger pr_debug("READ ITT: 0x%08x: t_state: %d never sent to" 316e48354ceSNicholas Bellinger " transport\n", cmd->init_task_tag, 317e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 318acf3ecc4SChristoph Hellwig transport_handle_cdb_direct(se_cmd); 319e48354ceSNicholas Bellinger return 0; 320e48354ceSNicholas Bellinger } 321e48354ceSNicholas Bellinger 3227d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 323e48354ceSNicholas Bellinger pr_err("READ ITT: 0x%08x: t_state: %d, never returned" 324e48354ceSNicholas Bellinger " from transport\n", cmd->init_task_tag, 325e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 326e48354ceSNicholas Bellinger return -1; 327e48354ceSNicholas Bellinger } 328e48354ceSNicholas Bellinger 329e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 330e48354ceSNicholas Bellinger if (!dr) 331e48354ceSNicholas Bellinger return -1; 332e48354ceSNicholas Bellinger /* 333e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the 334e48354ceSNicholas Bellinger * Initiator is expecting. 335e48354ceSNicholas Bellinger */ 336e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = tmr_req->exp_data_sn; 337e48354ceSNicholas Bellinger dr->runlength = 0; 338e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 339e48354ceSNicholas Bellinger dr->recovery = DATAIN_CONNECTION_RECOVERY; 340e48354ceSNicholas Bellinger 341e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 342e48354ceSNicholas Bellinger 343e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 344e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 345e48354ceSNicholas Bellinger return 0; 346e48354ceSNicholas Bellinger } 347e48354ceSNicholas Bellinger 348e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_none( 349e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 350e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 351e48354ceSNicholas Bellinger { 352e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 353e48354ceSNicholas Bellinger 354e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 355e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 356e48354ceSNicholas Bellinger return 0; 357e48354ceSNicholas Bellinger } 358e48354ceSNicholas Bellinger 359e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_scsi_cmnd( 360e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 361e48354ceSNicholas Bellinger struct iscsi_conn *conn) 362e48354ceSNicholas Bellinger { 363e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; 364e48354ceSNicholas Bellinger struct se_cmd *se_cmd = se_tmr->ref_cmd; 365e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); 366e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 367e48354ceSNicholas Bellinger 368e48354ceSNicholas Bellinger if (!cmd->cr) { 369e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 370e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 371e48354ceSNicholas Bellinger return -1; 372e48354ceSNicholas Bellinger } 373e48354ceSNicholas Bellinger cr = cmd->cr; 374e48354ceSNicholas Bellinger 375e48354ceSNicholas Bellinger /* 376e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 377e48354ceSNicholas Bellinger * will be assigned. 378e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 379e48354ceSNicholas Bellinger */ 380e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 381e48354ceSNicholas Bellinger 382e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 383e48354ceSNicholas Bellinger 384e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 3852fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 386e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 387e48354ceSNicholas Bellinger 388e48354ceSNicholas Bellinger if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 389e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 390e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 391e48354ceSNicholas Bellinger return 0; 392e48354ceSNicholas Bellinger } 393e48354ceSNicholas Bellinger 394e48354ceSNicholas Bellinger switch (cmd->data_direction) { 395e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 396e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_write(cmd, tmr_req); 397e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 398e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_read(cmd, tmr_req); 399e48354ceSNicholas Bellinger case DMA_NONE: 400e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_none(cmd, tmr_req); 401e48354ceSNicholas Bellinger default: 402e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 403e48354ceSNicholas Bellinger cmd->data_direction); 404e48354ceSNicholas Bellinger return -1; 405e48354ceSNicholas Bellinger } 406e48354ceSNicholas Bellinger 407e48354ceSNicholas Bellinger return 0; 408e48354ceSNicholas Bellinger } 409e48354ceSNicholas Bellinger 410e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete( 411e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 412e48354ceSNicholas Bellinger struct iscsi_conn *conn) 413e48354ceSNicholas Bellinger { 414e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; 415e48354ceSNicholas Bellinger struct se_cmd *se_cmd; 416e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 417e48354ceSNicholas Bellinger int ret = 0; 418e48354ceSNicholas Bellinger 419e48354ceSNicholas Bellinger if (!se_tmr->ref_cmd) { 420e48354ceSNicholas Bellinger pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n"); 421e48354ceSNicholas Bellinger return -1; 422e48354ceSNicholas Bellinger } 423e48354ceSNicholas Bellinger se_cmd = se_tmr->ref_cmd; 424e48354ceSNicholas Bellinger cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); 425e48354ceSNicholas Bellinger 426e48354ceSNicholas Bellinger cmd->conn = conn; 427e48354ceSNicholas Bellinger 428e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 429e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 430e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn); 431e48354ceSNicholas Bellinger break; 432e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 433e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn); 434e48354ceSNicholas Bellinger break; 435e48354ceSNicholas Bellinger default: 436e48354ceSNicholas Bellinger pr_err("Illegal iSCSI Opcode 0x%02x during" 437e48354ceSNicholas Bellinger " command realligence\n", cmd->iscsi_opcode); 438e48354ceSNicholas Bellinger return -1; 439e48354ceSNicholas Bellinger } 440e48354ceSNicholas Bellinger 441e48354ceSNicholas Bellinger if (ret != 0) 442e48354ceSNicholas Bellinger return ret; 443e48354ceSNicholas Bellinger 444e48354ceSNicholas Bellinger pr_debug("Completed connection realligence for Opcode: 0x%02x," 445e48354ceSNicholas Bellinger " ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode, 446e48354ceSNicholas Bellinger cmd->init_task_tag, conn->cid); 447e48354ceSNicholas Bellinger 448e48354ceSNicholas Bellinger return 0; 449e48354ceSNicholas Bellinger } 450e48354ceSNicholas Bellinger 451e48354ceSNicholas Bellinger /* 452e48354ceSNicholas Bellinger * Handles special after-the-fact actions related to TMRs. 453e48354ceSNicholas Bellinger * Right now the only one that its really needed for is 454e48354ceSNicholas Bellinger * connection recovery releated TASK_REASSIGN. 455e48354ceSNicholas Bellinger */ 456e48354ceSNicholas Bellinger extern int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 457e48354ceSNicholas Bellinger { 458e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 459e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 460e48354ceSNicholas Bellinger 461e48354ceSNicholas Bellinger if (tmr_req->task_reassign && 462e48354ceSNicholas Bellinger (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 463e48354ceSNicholas Bellinger return iscsit_task_reassign_complete(tmr_req, conn); 464e48354ceSNicholas Bellinger 465e48354ceSNicholas Bellinger return 0; 466e48354ceSNicholas Bellinger } 467e48354ceSNicholas Bellinger 468e48354ceSNicholas Bellinger /* 469e48354ceSNicholas Bellinger * Nothing to do here, but leave it for good measure. :-) 470e48354ceSNicholas Bellinger */ 471e48354ceSNicholas Bellinger int iscsit_task_reassign_prepare_read( 472e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 473e48354ceSNicholas Bellinger struct iscsi_conn *conn) 474e48354ceSNicholas Bellinger { 475e48354ceSNicholas Bellinger return 0; 476e48354ceSNicholas Bellinger } 477e48354ceSNicholas Bellinger 478e48354ceSNicholas Bellinger static void iscsit_task_reassign_prepare_unsolicited_dataout( 479e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 480e48354ceSNicholas Bellinger struct iscsi_conn *conn) 481e48354ceSNicholas Bellinger { 482e48354ceSNicholas Bellinger int i, j; 483e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 484e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 485e48354ceSNicholas Bellinger 486e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 487e48354ceSNicholas Bellinger cmd->data_sn = 0; 488e48354ceSNicholas Bellinger 489e48354ceSNicholas Bellinger if (cmd->immediate_data) 490e48354ceSNicholas Bellinger cmd->r2t_offset += (cmd->first_burst_len - 491e48354ceSNicholas Bellinger cmd->seq_start_offset); 492e48354ceSNicholas Bellinger 493e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 494e48354ceSNicholas Bellinger cmd->write_data_done -= (cmd->immediate_data) ? 495e48354ceSNicholas Bellinger (cmd->first_burst_len - 496e48354ceSNicholas Bellinger cmd->seq_start_offset) : 497e48354ceSNicholas Bellinger cmd->first_burst_len; 498e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 499e48354ceSNicholas Bellinger return; 500e48354ceSNicholas Bellinger } 501e48354ceSNicholas Bellinger 502e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 503e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 504e48354ceSNicholas Bellinger 505e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 506e48354ceSNicholas Bellinger continue; 507e48354ceSNicholas Bellinger 508e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 509e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 510e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 511e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 512e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 513e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 514e48354ceSNicholas Bellinger } 515e48354ceSNicholas Bellinger } 516e48354ceSNicholas Bellinger } else { 517e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 518e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 519e48354ceSNicholas Bellinger 520e48354ceSNicholas Bellinger if (seq->type != SEQTYPE_UNSOLICITED) 521e48354ceSNicholas Bellinger continue; 522e48354ceSNicholas Bellinger 523e48354ceSNicholas Bellinger cmd->write_data_done -= 524e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 525e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 526e48354ceSNicholas Bellinger seq->data_sn = 0; 527e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 528e48354ceSNicholas Bellinger seq->next_burst_len = 0; 529e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 530e48354ceSNicholas Bellinger 531e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 532e48354ceSNicholas Bellinger continue; 533e48354ceSNicholas Bellinger 534e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 535e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[j+seq->pdu_start]; 536e48354ceSNicholas Bellinger 537e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 538e48354ceSNicholas Bellinger continue; 539e48354ceSNicholas Bellinger 540e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 541e48354ceSNicholas Bellinger } 542e48354ceSNicholas Bellinger } 543e48354ceSNicholas Bellinger } 544e48354ceSNicholas Bellinger } 545e48354ceSNicholas Bellinger 546e48354ceSNicholas Bellinger int iscsit_task_reassign_prepare_write( 547e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 548e48354ceSNicholas Bellinger struct iscsi_conn *conn) 549e48354ceSNicholas Bellinger { 550e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; 551e48354ceSNicholas Bellinger struct se_cmd *se_cmd = se_tmr->ref_cmd; 552e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); 553e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 554e48354ceSNicholas Bellinger struct iscsi_r2t *r2t = NULL, *r2t_tmp; 555e48354ceSNicholas Bellinger int first_incomplete_r2t = 1, i = 0; 556e48354ceSNicholas Bellinger 557e48354ceSNicholas Bellinger /* 558e48354ceSNicholas Bellinger * The command was in the process of receiving Unsolicited DataOUT when 559e48354ceSNicholas Bellinger * the connection failed. 560e48354ceSNicholas Bellinger */ 561e48354ceSNicholas Bellinger if (cmd->unsolicited_data) 562e48354ceSNicholas Bellinger iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn); 563e48354ceSNicholas Bellinger 564e48354ceSNicholas Bellinger /* 565e48354ceSNicholas Bellinger * The Initiator is requesting R2Ts starting from zero, skip 566e48354ceSNicholas Bellinger * checking acknowledged R2Ts and start checking struct iscsi_r2ts 567e48354ceSNicholas Bellinger * greater than zero. 568e48354ceSNicholas Bellinger */ 569e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) 570e48354ceSNicholas Bellinger goto drop_unacknowledged_r2ts; 571e48354ceSNicholas Bellinger 572e48354ceSNicholas Bellinger /* 573e48354ceSNicholas Bellinger * We now check that the PDUs in DataOUT sequences below 574e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is 575e48354ceSNicholas Bellinger * expecting next) have all the DataOUT they require to complete 576e48354ceSNicholas Bellinger * the DataOUT sequence. First scan from R2TSN 0 to TMR 577e48354ceSNicholas Bellinger * TASK_REASSIGN ExpDataSN-1. 578e48354ceSNicholas Bellinger * 579e48354ceSNicholas Bellinger * If we have not received all DataOUT in question, we must 580e48354ceSNicholas Bellinger * make sure to make the appropriate changes to values in 581e48354ceSNicholas Bellinger * struct iscsi_cmd (and elsewhere depending on session parameters) 582e48354ceSNicholas Bellinger * so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write() 583e48354ceSNicholas Bellinger * will resend a new R2T for the DataOUT sequences in question. 584e48354ceSNicholas Bellinger */ 585e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 586e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 587e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 588e48354ceSNicholas Bellinger return -1; 589e48354ceSNicholas Bellinger } 590e48354ceSNicholas Bellinger 591e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 592e48354ceSNicholas Bellinger 593e48354ceSNicholas Bellinger if (r2t->r2t_sn >= tmr_req->exp_data_sn) 594e48354ceSNicholas Bellinger continue; 595e48354ceSNicholas Bellinger /* 596e48354ceSNicholas Bellinger * Safely ignore Recovery R2Ts and R2Ts that have completed 597e48354ceSNicholas Bellinger * DataOUT sequences. 598e48354ceSNicholas Bellinger */ 599e48354ceSNicholas Bellinger if (r2t->seq_complete) 600e48354ceSNicholas Bellinger continue; 601e48354ceSNicholas Bellinger 602e48354ceSNicholas Bellinger if (r2t->recovery_r2t) 603e48354ceSNicholas Bellinger continue; 604e48354ceSNicholas Bellinger 605e48354ceSNicholas Bellinger /* 606e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes: 607e48354ceSNicholas Bellinger * 608e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 609e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 610e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, we must take into consideration 611e48354ceSNicholas Bellinger * the following: 612e48354ceSNicholas Bellinger * 613e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 614e48354ceSNicholas Bellinger * 615e48354ceSNicholas Bellinger * Taking into account that the Initiator controls the (possibly 616e48354ceSNicholas Bellinger * random) PDU Order in (possibly random) Sequence Order of 617e48354ceSNicholas Bellinger * DataOUT the target requests with R2Ts, we must take into 618e48354ceSNicholas Bellinger * consideration the following: 619e48354ceSNicholas Bellinger * 620e48354ceSNicholas Bellinger * DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]: 621e48354ceSNicholas Bellinger * 622e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 623e48354ceSNicholas Bellinger * the Target will re-request only the total sequence length 624e48354ceSNicholas Bellinger * minus current received offset. This is because we must 625e48354ceSNicholas Bellinger * assume the initiator will continue sending DataOUT from the 626e48354ceSNicholas Bellinger * last PDU before the connection failed. 627e48354ceSNicholas Bellinger * 628e48354ceSNicholas Bellinger * DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]: 629e48354ceSNicholas Bellinger * 630e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 631e48354ceSNicholas Bellinger * the Target will re-request the entire DataOUT sequence if 632e48354ceSNicholas Bellinger * any single PDU is missing from the sequence. This is because 633e48354ceSNicholas Bellinger * we have no logical method to determine the next PDU offset, 634e48354ceSNicholas Bellinger * and we must assume the Initiator will be sending any random 635e48354ceSNicholas Bellinger * PDU offset in the current sequence after TASK_REASSIGN 636e48354ceSNicholas Bellinger * has completed. 637e48354ceSNicholas Bellinger */ 638e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 639e48354ceSNicholas Bellinger if (!first_incomplete_r2t) { 640e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 641e48354ceSNicholas Bellinger goto next; 642e48354ceSNicholas Bellinger } 643e48354ceSNicholas Bellinger 644e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 645e48354ceSNicholas Bellinger cmd->data_sn = 0; 646e48354ceSNicholas Bellinger cmd->r2t_offset -= (r2t->xfer_len - 647e48354ceSNicholas Bellinger cmd->next_burst_len); 648e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 649e48354ceSNicholas Bellinger goto next; 650e48354ceSNicholas Bellinger } 651e48354ceSNicholas Bellinger 652e48354ceSNicholas Bellinger cmd->data_sn = 0; 653e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 654e48354ceSNicholas Bellinger 655e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 656e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 657e48354ceSNicholas Bellinger 658e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 659e48354ceSNicholas Bellinger continue; 660e48354ceSNicholas Bellinger 661e48354ceSNicholas Bellinger if ((pdu->offset >= r2t->offset) && 662e48354ceSNicholas Bellinger (pdu->offset < (r2t->offset + 663e48354ceSNicholas Bellinger r2t->xfer_len))) { 664e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 665e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 666e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 667e48354ceSNicholas Bellinger } 668e48354ceSNicholas Bellinger } 669e48354ceSNicholas Bellinger 670e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 671e48354ceSNicholas Bellinger } else { 672e48354ceSNicholas Bellinger struct iscsi_seq *seq; 673e48354ceSNicholas Bellinger 674e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, r2t->offset, 675e48354ceSNicholas Bellinger r2t->xfer_len); 676e48354ceSNicholas Bellinger if (!seq) { 677e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 678e48354ceSNicholas Bellinger return -1; 679e48354ceSNicholas Bellinger } 680e48354ceSNicholas Bellinger 681e48354ceSNicholas Bellinger cmd->write_data_done -= 682e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 683e48354ceSNicholas Bellinger seq->data_sn = 0; 684e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 685e48354ceSNicholas Bellinger seq->next_burst_len = 0; 686e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 687e48354ceSNicholas Bellinger 688e48354ceSNicholas Bellinger cmd->seq_send_order--; 689e48354ceSNicholas Bellinger 690e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 691e48354ceSNicholas Bellinger goto next; 692e48354ceSNicholas Bellinger 693e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 694e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 695e48354ceSNicholas Bellinger 696e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 697e48354ceSNicholas Bellinger continue; 698e48354ceSNicholas Bellinger 699e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 700e48354ceSNicholas Bellinger } 701e48354ceSNicholas Bellinger } 702e48354ceSNicholas Bellinger 703e48354ceSNicholas Bellinger next: 704e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 705e48354ceSNicholas Bellinger } 706e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 707e48354ceSNicholas Bellinger 708e48354ceSNicholas Bellinger /* 709e48354ceSNicholas Bellinger * We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR 710e48354ceSNicholas Bellinger * TASK_REASSIGN to the last R2T in the list.. We are also careful 711e48354ceSNicholas Bellinger * to check that the Initiator is not requesting R2Ts for DataOUT 712e48354ceSNicholas Bellinger * sequences it has already completed. 713e48354ceSNicholas Bellinger * 714e48354ceSNicholas Bellinger * Free each R2T in question and adjust values in struct iscsi_cmd 715e48354ceSNicholas Bellinger * accordingly so iscsit_build_r2ts_for_cmd() do the rest of 716e48354ceSNicholas Bellinger * the work after the TMR TASK_REASSIGN Response is sent. 717e48354ceSNicholas Bellinger */ 718e48354ceSNicholas Bellinger drop_unacknowledged_r2ts: 719e48354ceSNicholas Bellinger 720e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_SENT_LAST_R2T; 721e48354ceSNicholas Bellinger cmd->r2t_sn = tmr_req->exp_data_sn; 722e48354ceSNicholas Bellinger 723e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 724e48354ceSNicholas Bellinger list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { 725e48354ceSNicholas Bellinger /* 726e48354ceSNicholas Bellinger * Skip up to the R2T Sequence number provided by the 727e48354ceSNicholas Bellinger * iSCSI TASK_REASSIGN TMR 728e48354ceSNicholas Bellinger */ 729e48354ceSNicholas Bellinger if (r2t->r2t_sn < tmr_req->exp_data_sn) 730e48354ceSNicholas Bellinger continue; 731e48354ceSNicholas Bellinger 732e48354ceSNicholas Bellinger if (r2t->seq_complete) { 733e48354ceSNicholas Bellinger pr_err("Initiator is requesting R2Ts from" 734e48354ceSNicholas Bellinger " R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u," 735e48354ceSNicholas Bellinger " Length: %u is already complete." 736e48354ceSNicholas Bellinger " BAD INITIATOR ERL=2 IMPLEMENTATION!\n", 737e48354ceSNicholas Bellinger tmr_req->exp_data_sn, r2t->r2t_sn, 738e48354ceSNicholas Bellinger r2t->offset, r2t->xfer_len); 739e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 740e48354ceSNicholas Bellinger return -1; 741e48354ceSNicholas Bellinger } 742e48354ceSNicholas Bellinger 743e48354ceSNicholas Bellinger if (r2t->recovery_r2t) { 744e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 745e48354ceSNicholas Bellinger continue; 746e48354ceSNicholas Bellinger } 747e48354ceSNicholas Bellinger 748e48354ceSNicholas Bellinger /* DataSequenceInOrder=Yes: 749e48354ceSNicholas Bellinger * 750e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 751e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 752e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, it's safe to subtract the R2Ts 753e48354ceSNicholas Bellinger * entire transfer length from the commands R2T offset marker. 754e48354ceSNicholas Bellinger * 755e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 756e48354ceSNicholas Bellinger * 757e48354ceSNicholas Bellinger * We subtract the difference from struct iscsi_seq between the 758e48354ceSNicholas Bellinger * current offset and original offset from cmd->write_data_done 759e48354ceSNicholas Bellinger * for account for DataOUT PDUs already received. Then reset 760e48354ceSNicholas Bellinger * the current offset to the original and zero out the current 761e48354ceSNicholas Bellinger * burst length, to make sure we re-request the entire DataOUT 762e48354ceSNicholas Bellinger * sequence. 763e48354ceSNicholas Bellinger */ 764e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) 765e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 766e48354ceSNicholas Bellinger else 767e48354ceSNicholas Bellinger cmd->seq_send_order--; 768e48354ceSNicholas Bellinger 769e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 770e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 771e48354ceSNicholas Bellinger } 772e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 773e48354ceSNicholas Bellinger 774e48354ceSNicholas Bellinger return 0; 775e48354ceSNicholas Bellinger } 776e48354ceSNicholas Bellinger 777e48354ceSNicholas Bellinger /* 778e48354ceSNicholas Bellinger * Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for 779e48354ceSNicholas Bellinger * a given struct iscsi_cmd. 780e48354ceSNicholas Bellinger */ 781e48354ceSNicholas Bellinger int iscsit_check_task_reassign_expdatasn( 782e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 783e48354ceSNicholas Bellinger struct iscsi_conn *conn) 784e48354ceSNicholas Bellinger { 785e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; 786e48354ceSNicholas Bellinger struct se_cmd *se_cmd = se_tmr->ref_cmd; 787e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); 788e48354ceSNicholas Bellinger 789e48354ceSNicholas Bellinger if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) 790e48354ceSNicholas Bellinger return 0; 791e48354ceSNicholas Bellinger 792e48354ceSNicholas Bellinger if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) 793e48354ceSNicholas Bellinger return 0; 794e48354ceSNicholas Bellinger 795e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_NONE) 796e48354ceSNicholas Bellinger return 0; 797e48354ceSNicholas Bellinger 798e48354ceSNicholas Bellinger /* 799e48354ceSNicholas Bellinger * For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN 800e48354ceSNicholas Bellinger * of DataIN the Initiator is expecting. 801e48354ceSNicholas Bellinger * 802e48354ceSNicholas Bellinger * Also check that the Initiator is not re-requesting DataIN that has 803e48354ceSNicholas Bellinger * already been acknowledged with a DataAck SNACK. 804e48354ceSNicholas Bellinger */ 805e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_FROM_DEVICE) { 806e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->data_sn) { 807e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 808e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 809e48354ceSNicholas Bellinger " DataSN: 0x%08x.\n", tmr_req->exp_data_sn, 810e48354ceSNicholas Bellinger ref_cmd->data_sn); 811e48354ceSNicholas Bellinger return -1; 812e48354ceSNicholas Bellinger } 813e48354ceSNicholas Bellinger if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 814e48354ceSNicholas Bellinger (tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) { 815e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 816e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN for previously" 817e48354ceSNicholas Bellinger " acknowledged DataIN: 0x%08x," 818e48354ceSNicholas Bellinger " protocol error\n", tmr_req->exp_data_sn, 819e48354ceSNicholas Bellinger ref_cmd->acked_data_sn); 820e48354ceSNicholas Bellinger return -1; 821e48354ceSNicholas Bellinger } 822e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_read(tmr_req, conn); 823e48354ceSNicholas Bellinger } 824e48354ceSNicholas Bellinger 825e48354ceSNicholas Bellinger /* 826e48354ceSNicholas Bellinger * For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN 827e48354ceSNicholas Bellinger * for R2Ts the Initiator is expecting. 828e48354ceSNicholas Bellinger * 829e48354ceSNicholas Bellinger * Do the magic in iscsit_task_reassign_prepare_write(). 830e48354ceSNicholas Bellinger */ 831e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_TO_DEVICE) { 832e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) { 833e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for WRITE" 834e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 835e48354ceSNicholas Bellinger " R2TSN: 0x%08x.\n", tmr_req->exp_data_sn, 836e48354ceSNicholas Bellinger ref_cmd->r2t_sn); 837e48354ceSNicholas Bellinger return -1; 838e48354ceSNicholas Bellinger } 839e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_write(tmr_req, conn); 840e48354ceSNicholas Bellinger } 841e48354ceSNicholas Bellinger 842e48354ceSNicholas Bellinger pr_err("Unknown iSCSI data_direction: 0x%02x\n", 843e48354ceSNicholas Bellinger ref_cmd->data_direction); 844e48354ceSNicholas Bellinger 845e48354ceSNicholas Bellinger return -1; 846e48354ceSNicholas Bellinger } 847