1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2e48354ceSNicholas Bellinger /******************************************************************************* 3e48354ceSNicholas Bellinger * This file contains the iSCSI Target specific Task Management functions. 4e48354ceSNicholas Bellinger * 54c76251eSNicholas Bellinger * (c) Copyright 2007-2013 Datera, Inc. 6e48354ceSNicholas Bellinger * 7e48354ceSNicholas Bellinger * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8e48354ceSNicholas Bellinger * 9e48354ceSNicholas Bellinger ******************************************************************************/ 10e48354ceSNicholas Bellinger 11e48354ceSNicholas Bellinger #include <asm/unaligned.h> 12ba929992SBart Van Assche #include <scsi/scsi_proto.h> 13e48354ceSNicholas Bellinger #include <scsi/iscsi_proto.h> 14e48354ceSNicholas Bellinger #include <target/target_core_base.h> 15c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 163e1c81a9SNicholas Bellinger #include <target/iscsi/iscsi_transport.h> 17e48354ceSNicholas Bellinger 1867f091f2SSagi Grimberg #include <target/iscsi/iscsi_target_core.h> 19e48354ceSNicholas Bellinger #include "iscsi_target_seq_pdu_list.h" 20e48354ceSNicholas Bellinger #include "iscsi_target_datain_values.h" 21e48354ceSNicholas Bellinger #include "iscsi_target_device.h" 22e48354ceSNicholas Bellinger #include "iscsi_target_erl0.h" 23e48354ceSNicholas Bellinger #include "iscsi_target_erl1.h" 24e48354ceSNicholas Bellinger #include "iscsi_target_erl2.h" 25e48354ceSNicholas Bellinger #include "iscsi_target_tmr.h" 26e48354ceSNicholas Bellinger #include "iscsi_target_tpg.h" 27e48354ceSNicholas Bellinger #include "iscsi_target_util.h" 28e48354ceSNicholas Bellinger #include "iscsi_target.h" 29e48354ceSNicholas Bellinger 30e48354ceSNicholas Bellinger u8 iscsit_tmr_abort_task( 31e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 32e48354ceSNicholas Bellinger unsigned char *buf) 33e48354ceSNicholas Bellinger { 34e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd; 35e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 36e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 37e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 38e48354ceSNicholas Bellinger struct iscsi_tm *hdr = (struct iscsi_tm *) buf; 39e48354ceSNicholas Bellinger 40e48354ceSNicholas Bellinger ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt); 41e48354ceSNicholas Bellinger if (!ref_cmd) { 42e48354ceSNicholas Bellinger pr_err("Unable to locate RefTaskTag: 0x%08x on CID:" 43e48354ceSNicholas Bellinger " %hu.\n", hdr->rtt, conn->cid); 4464c13330SSteve Hodgson return (iscsi_sna_gte(be32_to_cpu(hdr->refcmdsn), conn->sess->exp_cmd_sn) && 45109e2381SRoland Dreier iscsi_sna_lte(be32_to_cpu(hdr->refcmdsn), (u32) atomic_read(&conn->sess->max_cmd_sn))) ? 46e48354ceSNicholas Bellinger ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK; 47e48354ceSNicholas Bellinger } 4850e5c87dSChristoph Hellwig if (ref_cmd->cmd_sn != be32_to_cpu(hdr->refcmdsn)) { 49e48354ceSNicholas Bellinger pr_err("RefCmdSN 0x%08x does not equal" 50e48354ceSNicholas Bellinger " task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n", 51e48354ceSNicholas Bellinger hdr->refcmdsn, ref_cmd->cmd_sn); 52e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 53e48354ceSNicholas Bellinger } 54e48354ceSNicholas Bellinger 5566c7db68SChristoph Hellwig se_tmr->ref_task_tag = (__force u32)hdr->rtt; 569f3eb93eSChristoph Hellwig tmr_req->ref_cmd = ref_cmd; 5750e5c87dSChristoph Hellwig tmr_req->exp_data_sn = be32_to_cpu(hdr->exp_datasn); 58e48354ceSNicholas Bellinger 59e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_COMPLETE; 60e48354ceSNicholas Bellinger } 61e48354ceSNicholas Bellinger 62e48354ceSNicholas Bellinger /* 63e48354ceSNicholas Bellinger * Called from iscsit_handle_task_mgt_cmd(). 64e48354ceSNicholas Bellinger */ 65e48354ceSNicholas Bellinger int iscsit_tmr_task_warm_reset( 66e48354ceSNicholas Bellinger struct iscsi_conn *conn, 67e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 68e48354ceSNicholas Bellinger unsigned char *buf) 69e48354ceSNicholas Bellinger { 70e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 71e48354ceSNicholas Bellinger struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 728b1e1244SAndy Grover 73e48354ceSNicholas Bellinger if (!na->tmr_warm_reset) { 74e48354ceSNicholas Bellinger pr_err("TMR Opcode TARGET_WARM_RESET authorization" 75e48354ceSNicholas Bellinger " failed for Initiator Node: %s\n", 76e48354ceSNicholas Bellinger sess->se_sess->se_node_acl->initiatorname); 77e48354ceSNicholas Bellinger return -1; 78e48354ceSNicholas Bellinger } 79e48354ceSNicholas Bellinger /* 80e48354ceSNicholas Bellinger * Do the real work in transport_generic_do_tmr(). 81e48354ceSNicholas Bellinger */ 82e48354ceSNicholas Bellinger return 0; 83e48354ceSNicholas Bellinger } 84e48354ceSNicholas Bellinger 85e48354ceSNicholas Bellinger int iscsit_tmr_task_cold_reset( 86e48354ceSNicholas Bellinger struct iscsi_conn *conn, 87e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 88e48354ceSNicholas Bellinger unsigned char *buf) 89e48354ceSNicholas Bellinger { 90e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 91e48354ceSNicholas Bellinger struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 92e48354ceSNicholas Bellinger 93e48354ceSNicholas Bellinger if (!na->tmr_cold_reset) { 94e48354ceSNicholas Bellinger pr_err("TMR Opcode TARGET_COLD_RESET authorization" 95e48354ceSNicholas Bellinger " failed for Initiator Node: %s\n", 96e48354ceSNicholas Bellinger sess->se_sess->se_node_acl->initiatorname); 97e48354ceSNicholas Bellinger return -1; 98e48354ceSNicholas Bellinger } 99e48354ceSNicholas Bellinger /* 100e48354ceSNicholas Bellinger * Do the real work in transport_generic_do_tmr(). 101e48354ceSNicholas Bellinger */ 102e48354ceSNicholas Bellinger return 0; 103e48354ceSNicholas Bellinger } 104e48354ceSNicholas Bellinger 105e48354ceSNicholas Bellinger u8 iscsit_tmr_task_reassign( 106e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 107e48354ceSNicholas Bellinger unsigned char *buf) 108e48354ceSNicholas Bellinger { 109e48354ceSNicholas Bellinger struct iscsi_cmd *ref_cmd = NULL; 110e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 111e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr = NULL; 112e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 113e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 114e48354ceSNicholas Bellinger struct iscsi_tm *hdr = (struct iscsi_tm *) buf; 115f2d30680SHannes Reinecke u64 ret, ref_lun; 116e48354ceSNicholas Bellinger 117e48354ceSNicholas Bellinger pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x," 118e48354ceSNicholas Bellinger " RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n", 119e48354ceSNicholas Bellinger hdr->itt, hdr->rtt, hdr->exp_datasn, conn->cid); 120e48354ceSNicholas Bellinger 121e48354ceSNicholas Bellinger if (conn->sess->sess_ops->ErrorRecoveryLevel != 2) { 122e48354ceSNicholas Bellinger pr_err("TMR TASK_REASSIGN not supported in ERL<2," 123e48354ceSNicholas Bellinger " ignoring request.\n"); 124e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_NOT_SUPPORTED; 125e48354ceSNicholas Bellinger } 126e48354ceSNicholas Bellinger 127e48354ceSNicholas Bellinger ret = iscsit_find_cmd_for_recovery(conn->sess, &ref_cmd, &cr, hdr->rtt); 128e48354ceSNicholas Bellinger if (ret == -2) { 129e48354ceSNicholas Bellinger pr_err("Command ITT: 0x%08x is still alligent to CID:" 130e48354ceSNicholas Bellinger " %hu\n", ref_cmd->init_task_tag, cr->cid); 131e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_TASK_ALLEGIANT; 132e48354ceSNicholas Bellinger } else if (ret == -1) { 133e48354ceSNicholas Bellinger pr_err("Unable to locate RefTaskTag: 0x%08x in" 134e48354ceSNicholas Bellinger " connection recovery command list.\n", hdr->rtt); 135e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_NO_TASK; 136e48354ceSNicholas Bellinger } 137e48354ceSNicholas Bellinger /* 138e48354ceSNicholas Bellinger * Temporary check to prevent connection recovery for 1391c417f39SNicholas Bellinger * connections with a differing Max*DataSegmentLength. 140e48354ceSNicholas Bellinger */ 141e48354ceSNicholas Bellinger if (cr->maxrecvdatasegmentlength != 142e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength) { 143e48354ceSNicholas Bellinger pr_err("Unable to perform connection recovery for" 144e48354ceSNicholas Bellinger " differing MaxRecvDataSegmentLength, rejecting" 145e48354ceSNicholas Bellinger " TMR TASK_REASSIGN.\n"); 146e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 147e48354ceSNicholas Bellinger } 1481c417f39SNicholas Bellinger if (cr->maxxmitdatasegmentlength != 1491c417f39SNicholas Bellinger conn->conn_ops->MaxXmitDataSegmentLength) { 1501c417f39SNicholas Bellinger pr_err("Unable to perform connection recovery for" 1511c417f39SNicholas Bellinger " differing MaxXmitDataSegmentLength, rejecting" 1521c417f39SNicholas Bellinger " TMR TASK_REASSIGN.\n"); 1531c417f39SNicholas Bellinger return ISCSI_TMF_RSP_REJECTED; 1541c417f39SNicholas Bellinger } 155e48354ceSNicholas Bellinger 1569f3eb93eSChristoph Hellwig ref_lun = scsilun_to_int(&hdr->lun); 1579f3eb93eSChristoph Hellwig if (ref_lun != ref_cmd->se_cmd.orig_fe_lun) { 1589f3eb93eSChristoph Hellwig pr_err("Unable to perform connection recovery for" 159f2d30680SHannes Reinecke " differing ref_lun: %llu ref_cmd orig_fe_lun: %llu\n", 1609f3eb93eSChristoph Hellwig ref_lun, ref_cmd->se_cmd.orig_fe_lun); 1619f3eb93eSChristoph Hellwig return ISCSI_TMF_RSP_REJECTED; 1629f3eb93eSChristoph Hellwig } 1639f3eb93eSChristoph Hellwig 16466c7db68SChristoph Hellwig se_tmr->ref_task_tag = (__force u32)hdr->rtt; 1659f3eb93eSChristoph Hellwig tmr_req->ref_cmd = ref_cmd; 16650e5c87dSChristoph Hellwig tmr_req->exp_data_sn = be32_to_cpu(hdr->exp_datasn); 167e48354ceSNicholas Bellinger tmr_req->conn_recovery = cr; 168e48354ceSNicholas Bellinger tmr_req->task_reassign = 1; 169e48354ceSNicholas Bellinger /* 170e48354ceSNicholas Bellinger * Command can now be reassigned to a new connection. 171e48354ceSNicholas Bellinger * The task management response must be sent before the 172e48354ceSNicholas Bellinger * reassignment actually happens. See iscsi_tmr_post_handler(). 173e48354ceSNicholas Bellinger */ 174e48354ceSNicholas Bellinger return ISCSI_TMF_RSP_COMPLETE; 175e48354ceSNicholas Bellinger } 176e48354ceSNicholas Bellinger 177e48354ceSNicholas Bellinger static void iscsit_task_reassign_remove_cmd( 178e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 179e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr, 180e48354ceSNicholas Bellinger struct iscsi_session *sess) 181e48354ceSNicholas Bellinger { 182e48354ceSNicholas Bellinger int ret; 183e48354ceSNicholas Bellinger 184e48354ceSNicholas Bellinger spin_lock(&cr->conn_recovery_cmd_lock); 185e48354ceSNicholas Bellinger ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess); 186e48354ceSNicholas Bellinger spin_unlock(&cr->conn_recovery_cmd_lock); 187e48354ceSNicholas Bellinger if (!ret) { 188e48354ceSNicholas Bellinger pr_debug("iSCSI connection recovery successful for CID:" 189e48354ceSNicholas Bellinger " %hu on SID: %u\n", cr->cid, sess->sid); 190e48354ceSNicholas Bellinger iscsit_remove_active_connection_recovery_entry(cr, sess); 191e48354ceSNicholas Bellinger } 192e48354ceSNicholas Bellinger } 193e48354ceSNicholas Bellinger 194e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_nop_out( 195e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 196e48354ceSNicholas Bellinger struct iscsi_conn *conn) 197e48354ceSNicholas Bellinger { 1989f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 199e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 200e48354ceSNicholas Bellinger 201e48354ceSNicholas Bellinger if (!cmd->cr) { 202e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 203e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 204e48354ceSNicholas Bellinger return -1; 205e48354ceSNicholas Bellinger } 206e48354ceSNicholas Bellinger cr = cmd->cr; 207e48354ceSNicholas Bellinger 208e48354ceSNicholas Bellinger /* 209e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 210e48354ceSNicholas Bellinger * will be assigned. 211e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 212e48354ceSNicholas Bellinger */ 213e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 214e48354ceSNicholas Bellinger 215e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 216e48354ceSNicholas Bellinger 217e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 2182fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 219e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 220e48354ceSNicholas Bellinger 221e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_NOPIN; 222e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 223e48354ceSNicholas Bellinger return 0; 224e48354ceSNicholas Bellinger } 225e48354ceSNicholas Bellinger 226e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_write( 227e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 228e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 229e48354ceSNicholas Bellinger { 230e48354ceSNicholas Bellinger int no_build_r2ts = 0; 231e48354ceSNicholas Bellinger u32 length = 0, offset = 0; 232e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 233e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 234e48354ceSNicholas Bellinger /* 235e48354ceSNicholas Bellinger * The Initiator must not send a R2T SNACK with a Begrun less than 236e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 237e48354ceSNicholas Bellinger */ 238e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 239e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 240e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 241e48354ceSNicholas Bellinger } else { 242e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 243e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 244e48354ceSNicholas Bellinger } 245e48354ceSNicholas Bellinger 246e48354ceSNicholas Bellinger /* 247e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the 248e48354ceSNicholas Bellinger * Initiator is expecting. The Target controls all WRITE operations 249e48354ceSNicholas Bellinger * so if we have received all DataOUT we can safety ignore Initiator. 250e48354ceSNicholas Bellinger */ 251e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 2527d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 253e48354ceSNicholas Bellinger pr_debug("WRITE ITT: 0x%08x: t_state: %d" 254e48354ceSNicholas Bellinger " never sent to transport\n", 255e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->se_cmd.t_state); 25667441b68SChristoph Hellwig target_execute_cmd(se_cmd); 25767441b68SChristoph Hellwig return 0; 258e48354ceSNicholas Bellinger } 259e48354ceSNicholas Bellinger 260e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 261e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 262e48354ceSNicholas Bellinger return 0; 263e48354ceSNicholas Bellinger } 264e48354ceSNicholas Bellinger 265e48354ceSNicholas Bellinger /* 266e48354ceSNicholas Bellinger * Special case to deal with DataSequenceInOrder=No and Non-Immeidate 267e48354ceSNicholas Bellinger * Unsolicited DataOut. 268e48354ceSNicholas Bellinger */ 269e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 270e48354ceSNicholas Bellinger cmd->unsolicited_data = 0; 271e48354ceSNicholas Bellinger 272e48354ceSNicholas Bellinger offset = cmd->next_burst_len = cmd->write_data_done; 273e48354ceSNicholas Bellinger 274e48354ceSNicholas Bellinger if ((conn->sess->sess_ops->FirstBurstLength - offset) >= 275ebf1d95cSAndy Grover cmd->se_cmd.data_length) { 276e48354ceSNicholas Bellinger no_build_r2ts = 1; 277ebf1d95cSAndy Grover length = (cmd->se_cmd.data_length - offset); 278e48354ceSNicholas Bellinger } else 279e48354ceSNicholas Bellinger length = (conn->sess->sess_ops->FirstBurstLength - offset); 280e48354ceSNicholas Bellinger 281e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 282e48354ceSNicholas Bellinger if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) { 283e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 284e48354ceSNicholas Bellinger return -1; 285e48354ceSNicholas Bellinger } 286e48354ceSNicholas Bellinger cmd->outstanding_r2ts++; 287e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 288e48354ceSNicholas Bellinger 289e48354ceSNicholas Bellinger if (no_build_r2ts) 290e48354ceSNicholas Bellinger return 0; 291e48354ceSNicholas Bellinger } 292e48354ceSNicholas Bellinger /* 293e48354ceSNicholas Bellinger * iscsit_build_r2ts_for_cmd() can handle the rest from here. 294e48354ceSNicholas Bellinger */ 2953e1c81a9SNicholas Bellinger return conn->conn_transport->iscsit_get_dataout(conn, cmd, true); 296e48354ceSNicholas Bellinger } 297e48354ceSNicholas Bellinger 298e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_read( 299e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 300e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 301e48354ceSNicholas Bellinger { 302e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 303e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 304e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 305e48354ceSNicholas Bellinger /* 306e48354ceSNicholas Bellinger * The Initiator must not send a Data SNACK with a BegRun less than 307e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN's ExpDataSN. 308e48354ceSNicholas Bellinger */ 309e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) { 310e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; 311e48354ceSNicholas Bellinger cmd->acked_data_sn = 0; 312e48354ceSNicholas Bellinger } else { 313e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 314e48354ceSNicholas Bellinger cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); 315e48354ceSNicholas Bellinger } 316e48354ceSNicholas Bellinger 3177d680f3bSChristoph Hellwig if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { 318e48354ceSNicholas Bellinger pr_debug("READ ITT: 0x%08x: t_state: %d never sent to" 319e48354ceSNicholas Bellinger " transport\n", cmd->init_task_tag, 320e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 321acf3ecc4SChristoph Hellwig transport_handle_cdb_direct(se_cmd); 322e48354ceSNicholas Bellinger return 0; 323e48354ceSNicholas Bellinger } 324e48354ceSNicholas Bellinger 3257d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 326e48354ceSNicholas Bellinger pr_err("READ ITT: 0x%08x: t_state: %d, never returned" 327e48354ceSNicholas Bellinger " from transport\n", cmd->init_task_tag, 328e48354ceSNicholas Bellinger cmd->se_cmd.t_state); 329e48354ceSNicholas Bellinger return -1; 330e48354ceSNicholas Bellinger } 331e48354ceSNicholas Bellinger 332e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 333e48354ceSNicholas Bellinger if (!dr) 334e48354ceSNicholas Bellinger return -1; 335e48354ceSNicholas Bellinger /* 336e48354ceSNicholas Bellinger * The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the 337e48354ceSNicholas Bellinger * Initiator is expecting. 338e48354ceSNicholas Bellinger */ 339e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = tmr_req->exp_data_sn; 340e48354ceSNicholas Bellinger dr->runlength = 0; 341e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 342e48354ceSNicholas Bellinger dr->recovery = DATAIN_CONNECTION_RECOVERY; 343e48354ceSNicholas Bellinger 344e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 345e48354ceSNicholas Bellinger 346e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 347e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 348e48354ceSNicholas Bellinger return 0; 349e48354ceSNicholas Bellinger } 350e48354ceSNicholas Bellinger 351e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_none( 352e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 353e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req) 354e48354ceSNicholas Bellinger { 355e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 356e48354ceSNicholas Bellinger 357e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 358e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 359e48354ceSNicholas Bellinger return 0; 360e48354ceSNicholas Bellinger } 361e48354ceSNicholas Bellinger 362e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete_scsi_cmnd( 363e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 364e48354ceSNicholas Bellinger struct iscsi_conn *conn) 365e48354ceSNicholas Bellinger { 3669f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 367e48354ceSNicholas Bellinger struct iscsi_conn_recovery *cr; 368e48354ceSNicholas Bellinger 369e48354ceSNicholas Bellinger if (!cmd->cr) { 370e48354ceSNicholas Bellinger pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" 371e48354ceSNicholas Bellinger " is NULL!\n", cmd->init_task_tag); 372e48354ceSNicholas Bellinger return -1; 373e48354ceSNicholas Bellinger } 374e48354ceSNicholas Bellinger cr = cmd->cr; 375e48354ceSNicholas Bellinger 376e48354ceSNicholas Bellinger /* 377e48354ceSNicholas Bellinger * Reset the StatSN so a new one for this commands new connection 378e48354ceSNicholas Bellinger * will be assigned. 379e48354ceSNicholas Bellinger * Reset the ExpStatSN as well so we may receive Status SNACKs. 380e48354ceSNicholas Bellinger */ 381e48354ceSNicholas Bellinger cmd->stat_sn = cmd->exp_stat_sn = 0; 382e48354ceSNicholas Bellinger 383e48354ceSNicholas Bellinger iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); 384e48354ceSNicholas Bellinger 385e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 3862fbb471eSAndy Grover list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 387e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 388e48354ceSNicholas Bellinger 3899f3eb93eSChristoph Hellwig if (cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 390e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 391e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 392e48354ceSNicholas Bellinger return 0; 393e48354ceSNicholas Bellinger } 394e48354ceSNicholas Bellinger 395e48354ceSNicholas Bellinger switch (cmd->data_direction) { 396e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 397e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_write(cmd, tmr_req); 398e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 399e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_read(cmd, tmr_req); 400e48354ceSNicholas Bellinger case DMA_NONE: 401e48354ceSNicholas Bellinger return iscsit_task_reassign_complete_none(cmd, tmr_req); 402e48354ceSNicholas Bellinger default: 403e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 404e48354ceSNicholas Bellinger cmd->data_direction); 405e48354ceSNicholas Bellinger return -1; 406e48354ceSNicholas Bellinger } 407e48354ceSNicholas Bellinger 408e48354ceSNicholas Bellinger return 0; 409e48354ceSNicholas Bellinger } 410e48354ceSNicholas Bellinger 411e48354ceSNicholas Bellinger static int iscsit_task_reassign_complete( 412e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 413e48354ceSNicholas Bellinger struct iscsi_conn *conn) 414e48354ceSNicholas Bellinger { 415e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 416e48354ceSNicholas Bellinger int ret = 0; 417e48354ceSNicholas Bellinger 4189f3eb93eSChristoph Hellwig if (!tmr_req->ref_cmd) { 419e48354ceSNicholas Bellinger pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n"); 420e48354ceSNicholas Bellinger return -1; 421e48354ceSNicholas Bellinger } 4229f3eb93eSChristoph Hellwig cmd = tmr_req->ref_cmd; 423e48354ceSNicholas Bellinger 424e48354ceSNicholas Bellinger cmd->conn = conn; 425e48354ceSNicholas Bellinger 426e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 427e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 428e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn); 429e48354ceSNicholas Bellinger break; 430e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 431e48354ceSNicholas Bellinger ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn); 432e48354ceSNicholas Bellinger break; 433e48354ceSNicholas Bellinger default: 434e48354ceSNicholas Bellinger pr_err("Illegal iSCSI Opcode 0x%02x during" 43553c561dcSBart Van Assche " command reallegiance\n", cmd->iscsi_opcode); 436e48354ceSNicholas Bellinger return -1; 437e48354ceSNicholas Bellinger } 438e48354ceSNicholas Bellinger 439e48354ceSNicholas Bellinger if (ret != 0) 440e48354ceSNicholas Bellinger return ret; 441e48354ceSNicholas Bellinger 44253c561dcSBart Van Assche pr_debug("Completed connection reallegiance for Opcode: 0x%02x," 443e48354ceSNicholas Bellinger " ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode, 444e48354ceSNicholas Bellinger cmd->init_task_tag, conn->cid); 445e48354ceSNicholas Bellinger 446e48354ceSNicholas Bellinger return 0; 447e48354ceSNicholas Bellinger } 448e48354ceSNicholas Bellinger 449e48354ceSNicholas Bellinger /* 450e48354ceSNicholas Bellinger * Handles special after-the-fact actions related to TMRs. 451e48354ceSNicholas Bellinger * Right now the only one that its really needed for is 452e48354ceSNicholas Bellinger * connection recovery releated TASK_REASSIGN. 453e48354ceSNicholas Bellinger */ 454fceb5bc7SChristoph Hellwig int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 455e48354ceSNicholas Bellinger { 456e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req = cmd->tmr_req; 457e48354ceSNicholas Bellinger struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 458e48354ceSNicholas Bellinger 459e48354ceSNicholas Bellinger if (tmr_req->task_reassign && 460e48354ceSNicholas Bellinger (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 461e48354ceSNicholas Bellinger return iscsit_task_reassign_complete(tmr_req, conn); 462e48354ceSNicholas Bellinger 463e48354ceSNicholas Bellinger return 0; 464e48354ceSNicholas Bellinger } 4652ec5a8c1SNicholas Bellinger EXPORT_SYMBOL(iscsit_tmr_post_handler); 466e48354ceSNicholas Bellinger 467e48354ceSNicholas Bellinger /* 468e48354ceSNicholas Bellinger * Nothing to do here, but leave it for good measure. :-) 469e48354ceSNicholas Bellinger */ 470fceb5bc7SChristoph Hellwig static int iscsit_task_reassign_prepare_read( 471e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 472e48354ceSNicholas Bellinger struct iscsi_conn *conn) 473e48354ceSNicholas Bellinger { 474e48354ceSNicholas Bellinger return 0; 475e48354ceSNicholas Bellinger } 476e48354ceSNicholas Bellinger 477e48354ceSNicholas Bellinger static void iscsit_task_reassign_prepare_unsolicited_dataout( 478e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 479e48354ceSNicholas Bellinger struct iscsi_conn *conn) 480e48354ceSNicholas Bellinger { 481e48354ceSNicholas Bellinger int i, j; 482e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 483e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 484e48354ceSNicholas Bellinger 485e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 486e48354ceSNicholas Bellinger cmd->data_sn = 0; 487e48354ceSNicholas Bellinger 488e48354ceSNicholas Bellinger if (cmd->immediate_data) 489e48354ceSNicholas Bellinger cmd->r2t_offset += (cmd->first_burst_len - 490e48354ceSNicholas Bellinger cmd->seq_start_offset); 491e48354ceSNicholas Bellinger 492e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 493e48354ceSNicholas Bellinger cmd->write_data_done -= (cmd->immediate_data) ? 494e48354ceSNicholas Bellinger (cmd->first_burst_len - 495e48354ceSNicholas Bellinger cmd->seq_start_offset) : 496e48354ceSNicholas Bellinger cmd->first_burst_len; 497e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 498e48354ceSNicholas Bellinger return; 499e48354ceSNicholas Bellinger } 500e48354ceSNicholas Bellinger 501e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 502e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 503e48354ceSNicholas Bellinger 504e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 505e48354ceSNicholas Bellinger continue; 506e48354ceSNicholas Bellinger 507e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 508e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 509e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 510e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 511e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 512e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 513e48354ceSNicholas Bellinger } 514e48354ceSNicholas Bellinger } 515e48354ceSNicholas Bellinger } else { 516e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 517e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 518e48354ceSNicholas Bellinger 519e48354ceSNicholas Bellinger if (seq->type != SEQTYPE_UNSOLICITED) 520e48354ceSNicholas Bellinger continue; 521e48354ceSNicholas Bellinger 522e48354ceSNicholas Bellinger cmd->write_data_done -= 523e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 524e48354ceSNicholas Bellinger cmd->first_burst_len = 0; 525e48354ceSNicholas Bellinger seq->data_sn = 0; 526e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 527e48354ceSNicholas Bellinger seq->next_burst_len = 0; 528e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 529e48354ceSNicholas Bellinger 530e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 531e48354ceSNicholas Bellinger continue; 532e48354ceSNicholas Bellinger 533e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 534e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[j+seq->pdu_start]; 535e48354ceSNicholas Bellinger 536e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 537e48354ceSNicholas Bellinger continue; 538e48354ceSNicholas Bellinger 539e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 540e48354ceSNicholas Bellinger } 541e48354ceSNicholas Bellinger } 542e48354ceSNicholas Bellinger } 543e48354ceSNicholas Bellinger } 544e48354ceSNicholas Bellinger 545fceb5bc7SChristoph Hellwig static int iscsit_task_reassign_prepare_write( 546e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 547e48354ceSNicholas Bellinger struct iscsi_conn *conn) 548e48354ceSNicholas Bellinger { 5499f3eb93eSChristoph Hellwig struct iscsi_cmd *cmd = tmr_req->ref_cmd; 550e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 551e48354ceSNicholas Bellinger struct iscsi_r2t *r2t = NULL, *r2t_tmp; 552e48354ceSNicholas Bellinger int first_incomplete_r2t = 1, i = 0; 553e48354ceSNicholas Bellinger 554e48354ceSNicholas Bellinger /* 555e48354ceSNicholas Bellinger * The command was in the process of receiving Unsolicited DataOUT when 556e48354ceSNicholas Bellinger * the connection failed. 557e48354ceSNicholas Bellinger */ 558e48354ceSNicholas Bellinger if (cmd->unsolicited_data) 559e48354ceSNicholas Bellinger iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn); 560e48354ceSNicholas Bellinger 561e48354ceSNicholas Bellinger /* 562e48354ceSNicholas Bellinger * The Initiator is requesting R2Ts starting from zero, skip 563e48354ceSNicholas Bellinger * checking acknowledged R2Ts and start checking struct iscsi_r2ts 564e48354ceSNicholas Bellinger * greater than zero. 565e48354ceSNicholas Bellinger */ 566e48354ceSNicholas Bellinger if (!tmr_req->exp_data_sn) 567e48354ceSNicholas Bellinger goto drop_unacknowledged_r2ts; 568e48354ceSNicholas Bellinger 569e48354ceSNicholas Bellinger /* 570e48354ceSNicholas Bellinger * We now check that the PDUs in DataOUT sequences below 571e48354ceSNicholas Bellinger * the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is 572e48354ceSNicholas Bellinger * expecting next) have all the DataOUT they require to complete 573e48354ceSNicholas Bellinger * the DataOUT sequence. First scan from R2TSN 0 to TMR 574e48354ceSNicholas Bellinger * TASK_REASSIGN ExpDataSN-1. 575e48354ceSNicholas Bellinger * 576e48354ceSNicholas Bellinger * If we have not received all DataOUT in question, we must 577e48354ceSNicholas Bellinger * make sure to make the appropriate changes to values in 578e48354ceSNicholas Bellinger * struct iscsi_cmd (and elsewhere depending on session parameters) 579e48354ceSNicholas Bellinger * so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write() 580e48354ceSNicholas Bellinger * will resend a new R2T for the DataOUT sequences in question. 581e48354ceSNicholas Bellinger */ 582e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 583e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 584e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 585e48354ceSNicholas Bellinger return -1; 586e48354ceSNicholas Bellinger } 587e48354ceSNicholas Bellinger 588e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 589e48354ceSNicholas Bellinger 590e48354ceSNicholas Bellinger if (r2t->r2t_sn >= tmr_req->exp_data_sn) 591e48354ceSNicholas Bellinger continue; 592e48354ceSNicholas Bellinger /* 593e48354ceSNicholas Bellinger * Safely ignore Recovery R2Ts and R2Ts that have completed 594e48354ceSNicholas Bellinger * DataOUT sequences. 595e48354ceSNicholas Bellinger */ 596e48354ceSNicholas Bellinger if (r2t->seq_complete) 597e48354ceSNicholas Bellinger continue; 598e48354ceSNicholas Bellinger 599e48354ceSNicholas Bellinger if (r2t->recovery_r2t) 600e48354ceSNicholas Bellinger continue; 601e48354ceSNicholas Bellinger 602e48354ceSNicholas Bellinger /* 603e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes: 604e48354ceSNicholas Bellinger * 605e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 606e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 607e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, we must take into consideration 608e48354ceSNicholas Bellinger * the following: 609e48354ceSNicholas Bellinger * 610e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 611e48354ceSNicholas Bellinger * 612e48354ceSNicholas Bellinger * Taking into account that the Initiator controls the (possibly 613e48354ceSNicholas Bellinger * random) PDU Order in (possibly random) Sequence Order of 614e48354ceSNicholas Bellinger * DataOUT the target requests with R2Ts, we must take into 615e48354ceSNicholas Bellinger * consideration the following: 616e48354ceSNicholas Bellinger * 617e48354ceSNicholas Bellinger * DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]: 618e48354ceSNicholas Bellinger * 619e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 620e48354ceSNicholas Bellinger * the Target will re-request only the total sequence length 621e48354ceSNicholas Bellinger * minus current received offset. This is because we must 622e48354ceSNicholas Bellinger * assume the initiator will continue sending DataOUT from the 623e48354ceSNicholas Bellinger * last PDU before the connection failed. 624e48354ceSNicholas Bellinger * 625e48354ceSNicholas Bellinger * DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]: 626e48354ceSNicholas Bellinger * 627e48354ceSNicholas Bellinger * While processing non-complete R2T DataOUT sequence requests 628e48354ceSNicholas Bellinger * the Target will re-request the entire DataOUT sequence if 629e48354ceSNicholas Bellinger * any single PDU is missing from the sequence. This is because 630e48354ceSNicholas Bellinger * we have no logical method to determine the next PDU offset, 631e48354ceSNicholas Bellinger * and we must assume the Initiator will be sending any random 632e48354ceSNicholas Bellinger * PDU offset in the current sequence after TASK_REASSIGN 633e48354ceSNicholas Bellinger * has completed. 634e48354ceSNicholas Bellinger */ 635e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 636e48354ceSNicholas Bellinger if (!first_incomplete_r2t) { 637e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 638e48354ceSNicholas Bellinger goto next; 639e48354ceSNicholas Bellinger } 640e48354ceSNicholas Bellinger 641e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 642e48354ceSNicholas Bellinger cmd->data_sn = 0; 643e48354ceSNicholas Bellinger cmd->r2t_offset -= (r2t->xfer_len - 644e48354ceSNicholas Bellinger cmd->next_burst_len); 645e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 646e48354ceSNicholas Bellinger goto next; 647e48354ceSNicholas Bellinger } 648e48354ceSNicholas Bellinger 649e48354ceSNicholas Bellinger cmd->data_sn = 0; 650e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 651e48354ceSNicholas Bellinger 652e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 653e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 654e48354ceSNicholas Bellinger 655e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 656e48354ceSNicholas Bellinger continue; 657e48354ceSNicholas Bellinger 658e48354ceSNicholas Bellinger if ((pdu->offset >= r2t->offset) && 659e48354ceSNicholas Bellinger (pdu->offset < (r2t->offset + 660e48354ceSNicholas Bellinger r2t->xfer_len))) { 661e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 662e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 663e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 664e48354ceSNicholas Bellinger } 665e48354ceSNicholas Bellinger } 666e48354ceSNicholas Bellinger 667e48354ceSNicholas Bellinger first_incomplete_r2t = 0; 668e48354ceSNicholas Bellinger } else { 669e48354ceSNicholas Bellinger struct iscsi_seq *seq; 670e48354ceSNicholas Bellinger 671e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, r2t->offset, 672e48354ceSNicholas Bellinger r2t->xfer_len); 673e48354ceSNicholas Bellinger if (!seq) { 674e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 675e48354ceSNicholas Bellinger return -1; 676e48354ceSNicholas Bellinger } 677e48354ceSNicholas Bellinger 678e48354ceSNicholas Bellinger cmd->write_data_done -= 679e48354ceSNicholas Bellinger (seq->offset - seq->orig_offset); 680e48354ceSNicholas Bellinger seq->data_sn = 0; 681e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 682e48354ceSNicholas Bellinger seq->next_burst_len = 0; 683e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 684e48354ceSNicholas Bellinger 685e48354ceSNicholas Bellinger cmd->seq_send_order--; 686e48354ceSNicholas Bellinger 687e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 688e48354ceSNicholas Bellinger goto next; 689e48354ceSNicholas Bellinger 690e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 691e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 692e48354ceSNicholas Bellinger 693e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 694e48354ceSNicholas Bellinger continue; 695e48354ceSNicholas Bellinger 696e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 697e48354ceSNicholas Bellinger } 698e48354ceSNicholas Bellinger } 699e48354ceSNicholas Bellinger 700e48354ceSNicholas Bellinger next: 701e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 702e48354ceSNicholas Bellinger } 703e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 704e48354ceSNicholas Bellinger 705e48354ceSNicholas Bellinger /* 706e48354ceSNicholas Bellinger * We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR 707e48354ceSNicholas Bellinger * TASK_REASSIGN to the last R2T in the list.. We are also careful 708e48354ceSNicholas Bellinger * to check that the Initiator is not requesting R2Ts for DataOUT 709e48354ceSNicholas Bellinger * sequences it has already completed. 710e48354ceSNicholas Bellinger * 711e48354ceSNicholas Bellinger * Free each R2T in question and adjust values in struct iscsi_cmd 712e48354ceSNicholas Bellinger * accordingly so iscsit_build_r2ts_for_cmd() do the rest of 713e48354ceSNicholas Bellinger * the work after the TMR TASK_REASSIGN Response is sent. 714e48354ceSNicholas Bellinger */ 715e48354ceSNicholas Bellinger drop_unacknowledged_r2ts: 716e48354ceSNicholas Bellinger 717e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_SENT_LAST_R2T; 718e48354ceSNicholas Bellinger cmd->r2t_sn = tmr_req->exp_data_sn; 719e48354ceSNicholas Bellinger 720e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 721e48354ceSNicholas Bellinger list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { 722e48354ceSNicholas Bellinger /* 723e48354ceSNicholas Bellinger * Skip up to the R2T Sequence number provided by the 724e48354ceSNicholas Bellinger * iSCSI TASK_REASSIGN TMR 725e48354ceSNicholas Bellinger */ 726e48354ceSNicholas Bellinger if (r2t->r2t_sn < tmr_req->exp_data_sn) 727e48354ceSNicholas Bellinger continue; 728e48354ceSNicholas Bellinger 729e48354ceSNicholas Bellinger if (r2t->seq_complete) { 730e48354ceSNicholas Bellinger pr_err("Initiator is requesting R2Ts from" 731e48354ceSNicholas Bellinger " R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u," 732e48354ceSNicholas Bellinger " Length: %u is already complete." 733e48354ceSNicholas Bellinger " BAD INITIATOR ERL=2 IMPLEMENTATION!\n", 734e48354ceSNicholas Bellinger tmr_req->exp_data_sn, r2t->r2t_sn, 735e48354ceSNicholas Bellinger r2t->offset, r2t->xfer_len); 736e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 737e48354ceSNicholas Bellinger return -1; 738e48354ceSNicholas Bellinger } 739e48354ceSNicholas Bellinger 740e48354ceSNicholas Bellinger if (r2t->recovery_r2t) { 741e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 742e48354ceSNicholas Bellinger continue; 743e48354ceSNicholas Bellinger } 744e48354ceSNicholas Bellinger 745e48354ceSNicholas Bellinger /* DataSequenceInOrder=Yes: 746e48354ceSNicholas Bellinger * 747e48354ceSNicholas Bellinger * Taking into account the iSCSI implementation requirement of 748e48354ceSNicholas Bellinger * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and 749e48354ceSNicholas Bellinger * DataSequenceInOrder=Yes, it's safe to subtract the R2Ts 750e48354ceSNicholas Bellinger * entire transfer length from the commands R2T offset marker. 751e48354ceSNicholas Bellinger * 752e48354ceSNicholas Bellinger * DataSequenceInOrder=No: 753e48354ceSNicholas Bellinger * 754e48354ceSNicholas Bellinger * We subtract the difference from struct iscsi_seq between the 755e48354ceSNicholas Bellinger * current offset and original offset from cmd->write_data_done 756e48354ceSNicholas Bellinger * for account for DataOUT PDUs already received. Then reset 757e48354ceSNicholas Bellinger * the current offset to the original and zero out the current 758e48354ceSNicholas Bellinger * burst length, to make sure we re-request the entire DataOUT 759e48354ceSNicholas Bellinger * sequence. 760e48354ceSNicholas Bellinger */ 761e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) 762e48354ceSNicholas Bellinger cmd->r2t_offset -= r2t->xfer_len; 763e48354ceSNicholas Bellinger else 764e48354ceSNicholas Bellinger cmd->seq_send_order--; 765e48354ceSNicholas Bellinger 766e48354ceSNicholas Bellinger cmd->outstanding_r2ts--; 767e48354ceSNicholas Bellinger iscsit_free_r2t(r2t, cmd); 768e48354ceSNicholas Bellinger } 769e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 770e48354ceSNicholas Bellinger 771e48354ceSNicholas Bellinger return 0; 772e48354ceSNicholas Bellinger } 773e48354ceSNicholas Bellinger 774e48354ceSNicholas Bellinger /* 775e48354ceSNicholas Bellinger * Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for 776e48354ceSNicholas Bellinger * a given struct iscsi_cmd. 777e48354ceSNicholas Bellinger */ 778e48354ceSNicholas Bellinger int iscsit_check_task_reassign_expdatasn( 779e48354ceSNicholas Bellinger struct iscsi_tmr_req *tmr_req, 780e48354ceSNicholas Bellinger struct iscsi_conn *conn) 781e48354ceSNicholas Bellinger { 7829f3eb93eSChristoph Hellwig struct iscsi_cmd *ref_cmd = tmr_req->ref_cmd; 783e48354ceSNicholas Bellinger 784e48354ceSNicholas Bellinger if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) 785e48354ceSNicholas Bellinger return 0; 786e48354ceSNicholas Bellinger 7879f3eb93eSChristoph Hellwig if (ref_cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) 788e48354ceSNicholas Bellinger return 0; 789e48354ceSNicholas Bellinger 790e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_NONE) 791e48354ceSNicholas Bellinger return 0; 792e48354ceSNicholas Bellinger 793e48354ceSNicholas Bellinger /* 794e48354ceSNicholas Bellinger * For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN 795e48354ceSNicholas Bellinger * of DataIN the Initiator is expecting. 796e48354ceSNicholas Bellinger * 797e48354ceSNicholas Bellinger * Also check that the Initiator is not re-requesting DataIN that has 798e48354ceSNicholas Bellinger * already been acknowledged with a DataAck SNACK. 799e48354ceSNicholas Bellinger */ 800e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_FROM_DEVICE) { 801e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->data_sn) { 802e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 803e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 804e48354ceSNicholas Bellinger " DataSN: 0x%08x.\n", tmr_req->exp_data_sn, 805e48354ceSNicholas Bellinger ref_cmd->data_sn); 806e48354ceSNicholas Bellinger return -1; 807e48354ceSNicholas Bellinger } 808e48354ceSNicholas Bellinger if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 809e48354ceSNicholas Bellinger (tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) { 810e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for READ" 811e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN for previously" 812e48354ceSNicholas Bellinger " acknowledged DataIN: 0x%08x," 813e48354ceSNicholas Bellinger " protocol error\n", tmr_req->exp_data_sn, 814e48354ceSNicholas Bellinger ref_cmd->acked_data_sn); 815e48354ceSNicholas Bellinger return -1; 816e48354ceSNicholas Bellinger } 817e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_read(tmr_req, conn); 818e48354ceSNicholas Bellinger } 819e48354ceSNicholas Bellinger 820e48354ceSNicholas Bellinger /* 821e48354ceSNicholas Bellinger * For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN 822e48354ceSNicholas Bellinger * for R2Ts the Initiator is expecting. 823e48354ceSNicholas Bellinger * 824e48354ceSNicholas Bellinger * Do the magic in iscsit_task_reassign_prepare_write(). 825e48354ceSNicholas Bellinger */ 826e48354ceSNicholas Bellinger if (ref_cmd->data_direction == DMA_TO_DEVICE) { 827e48354ceSNicholas Bellinger if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) { 828e48354ceSNicholas Bellinger pr_err("Received ExpDataSN: 0x%08x for WRITE" 829e48354ceSNicholas Bellinger " in TMR TASK_REASSIGN greater than command's" 830e48354ceSNicholas Bellinger " R2TSN: 0x%08x.\n", tmr_req->exp_data_sn, 831e48354ceSNicholas Bellinger ref_cmd->r2t_sn); 832e48354ceSNicholas Bellinger return -1; 833e48354ceSNicholas Bellinger } 834e48354ceSNicholas Bellinger return iscsit_task_reassign_prepare_write(tmr_req, conn); 835e48354ceSNicholas Bellinger } 836e48354ceSNicholas Bellinger 837e48354ceSNicholas Bellinger pr_err("Unknown iSCSI data_direction: 0x%02x\n", 838e48354ceSNicholas Bellinger ref_cmd->data_direction); 839e48354ceSNicholas Bellinger 840e48354ceSNicholas Bellinger return -1; 841e48354ceSNicholas Bellinger } 842