1e48354ceSNicholas Bellinger /******************************************************************************* 2e48354ceSNicholas Bellinger * This file contains error recovery level one used by the iSCSI Target driver. 3e48354ceSNicholas Bellinger * 44c76251eSNicholas Bellinger * (c) Copyright 2007-2013 Datera, Inc. 5e48354ceSNicholas Bellinger * 6e48354ceSNicholas Bellinger * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7e48354ceSNicholas Bellinger * 8e48354ceSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 9e48354ceSNicholas Bellinger * it under the terms of the GNU General Public License as published by 10e48354ceSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 11e48354ceSNicholas Bellinger * (at your option) any later version. 12e48354ceSNicholas Bellinger * 13e48354ceSNicholas Bellinger * This program is distributed in the hope that it will be useful, 14e48354ceSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 15e48354ceSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16e48354ceSNicholas Bellinger * GNU General Public License for more details. 17e48354ceSNicholas Bellinger ******************************************************************************/ 18e48354ceSNicholas Bellinger 19e48354ceSNicholas Bellinger #include <linux/list.h> 208dcf07beSBart Van Assche #include <linux/slab.h> 21e48354ceSNicholas Bellinger #include <scsi/iscsi_proto.h> 22e48354ceSNicholas Bellinger #include <target/target_core_base.h> 23c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 243e1c81a9SNicholas Bellinger #include <target/iscsi/iscsi_transport.h> 25e48354ceSNicholas Bellinger 2667f091f2SSagi Grimberg #include <target/iscsi/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_tpg.h" 31e48354ceSNicholas Bellinger #include "iscsi_target_util.h" 32e48354ceSNicholas Bellinger #include "iscsi_target_erl0.h" 33e48354ceSNicholas Bellinger #include "iscsi_target_erl1.h" 34e48354ceSNicholas Bellinger #include "iscsi_target_erl2.h" 35e48354ceSNicholas Bellinger #include "iscsi_target.h" 36e48354ceSNicholas Bellinger 37e48354ceSNicholas Bellinger #define OFFLOAD_BUF_SIZE 32768 38e48354ceSNicholas Bellinger 39e48354ceSNicholas Bellinger /* 40e48354ceSNicholas Bellinger * Used to dump excess datain payload for certain error recovery 41e48354ceSNicholas Bellinger * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). 42e48354ceSNicholas Bellinger * 43e48354ceSNicholas Bellinger * dump_padding_digest denotes if padding and data digests need 44e48354ceSNicholas Bellinger * to be dumped. 45e48354ceSNicholas Bellinger */ 46e48354ceSNicholas Bellinger int iscsit_dump_data_payload( 47e48354ceSNicholas Bellinger struct iscsi_conn *conn, 48e48354ceSNicholas Bellinger u32 buf_len, 49e48354ceSNicholas Bellinger int dump_padding_digest) 50e48354ceSNicholas Bellinger { 51e48354ceSNicholas Bellinger char *buf, pad_bytes[4]; 52e48354ceSNicholas Bellinger int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; 53e48354ceSNicholas Bellinger u32 length, padding, offset = 0, size; 54e48354ceSNicholas Bellinger struct kvec iov; 55e48354ceSNicholas Bellinger 563e1c81a9SNicholas Bellinger if (conn->sess->sess_ops->RDMAExtensions) 573e1c81a9SNicholas Bellinger return 0; 583e1c81a9SNicholas Bellinger 59e48354ceSNicholas Bellinger length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; 60e48354ceSNicholas Bellinger 61e48354ceSNicholas Bellinger buf = kzalloc(length, GFP_ATOMIC); 62e48354ceSNicholas Bellinger if (!buf) { 63e48354ceSNicholas Bellinger pr_err("Unable to allocate %u bytes for offload" 64e48354ceSNicholas Bellinger " buffer.\n", length); 65e48354ceSNicholas Bellinger return -1; 66e48354ceSNicholas Bellinger } 67e48354ceSNicholas Bellinger memset(&iov, 0, sizeof(struct kvec)); 68e48354ceSNicholas Bellinger 69e48354ceSNicholas Bellinger while (offset < buf_len) { 70e48354ceSNicholas Bellinger size = ((offset + length) > buf_len) ? 71e48354ceSNicholas Bellinger (buf_len - offset) : length; 72e48354ceSNicholas Bellinger 73e48354ceSNicholas Bellinger iov.iov_len = size; 74e48354ceSNicholas Bellinger iov.iov_base = buf; 75e48354ceSNicholas Bellinger 76e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, size); 77e48354ceSNicholas Bellinger if (rx_got != size) { 78e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 79e48354ceSNicholas Bellinger goto out; 80e48354ceSNicholas Bellinger } 81e48354ceSNicholas Bellinger 82e48354ceSNicholas Bellinger offset += size; 83e48354ceSNicholas Bellinger } 84e48354ceSNicholas Bellinger 85e48354ceSNicholas Bellinger if (!dump_padding_digest) 86e48354ceSNicholas Bellinger goto out; 87e48354ceSNicholas Bellinger 88e48354ceSNicholas Bellinger padding = ((-buf_len) & 3); 89e48354ceSNicholas Bellinger if (padding != 0) { 90e48354ceSNicholas Bellinger iov.iov_len = padding; 91e48354ceSNicholas Bellinger iov.iov_base = pad_bytes; 92e48354ceSNicholas Bellinger 93e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, padding); 94e48354ceSNicholas Bellinger if (rx_got != padding) { 95e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 96e48354ceSNicholas Bellinger goto out; 97e48354ceSNicholas Bellinger } 98e48354ceSNicholas Bellinger } 99e48354ceSNicholas Bellinger 100e48354ceSNicholas Bellinger if (conn->conn_ops->DataDigest) { 101e48354ceSNicholas Bellinger u32 data_crc; 102e48354ceSNicholas Bellinger 103e48354ceSNicholas Bellinger iov.iov_len = ISCSI_CRC_LEN; 104e48354ceSNicholas Bellinger iov.iov_base = &data_crc; 105e48354ceSNicholas Bellinger 106e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 107e48354ceSNicholas Bellinger if (rx_got != ISCSI_CRC_LEN) { 108e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 109e48354ceSNicholas Bellinger goto out; 110e48354ceSNicholas Bellinger } 111e48354ceSNicholas Bellinger } 112e48354ceSNicholas Bellinger 113e48354ceSNicholas Bellinger out: 114e48354ceSNicholas Bellinger kfree(buf); 115e48354ceSNicholas Bellinger return ret; 116e48354ceSNicholas Bellinger } 117e48354ceSNicholas Bellinger 118e48354ceSNicholas Bellinger /* 119e48354ceSNicholas Bellinger * Used for retransmitting R2Ts from a R2T SNACK request. 120e48354ceSNicholas Bellinger */ 121e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t_for_snack( 122e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 123e48354ceSNicholas Bellinger struct iscsi_r2t *r2t) 124e48354ceSNicholas Bellinger { 125e48354ceSNicholas Bellinger /* 126e48354ceSNicholas Bellinger * If the struct iscsi_r2t has not been sent yet, we can safely 127e48354ceSNicholas Bellinger * ignore retransmission 128e48354ceSNicholas Bellinger * of the R2TSN in question. 129e48354ceSNicholas Bellinger */ 130e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 131e48354ceSNicholas Bellinger if (!r2t->sent_r2t) { 132e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 133e48354ceSNicholas Bellinger return 0; 134e48354ceSNicholas Bellinger } 135e48354ceSNicholas Bellinger r2t->sent_r2t = 0; 136e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 137e48354ceSNicholas Bellinger 138e48354ceSNicholas Bellinger iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 139e48354ceSNicholas Bellinger 140e48354ceSNicholas Bellinger return 0; 141e48354ceSNicholas Bellinger } 142e48354ceSNicholas Bellinger 143e48354ceSNicholas Bellinger static int iscsit_handle_r2t_snack( 144e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 145e48354ceSNicholas Bellinger unsigned char *buf, 146e48354ceSNicholas Bellinger u32 begrun, 147e48354ceSNicholas Bellinger u32 runlength) 148e48354ceSNicholas Bellinger { 149e48354ceSNicholas Bellinger u32 last_r2tsn; 150e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 151e48354ceSNicholas Bellinger 152e48354ceSNicholas Bellinger /* 153e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 154e48354ceSNicholas Bellinger * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. 155e48354ceSNicholas Bellinger */ 156e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 157e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 158e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, R2T SNACK requesting" 159e48354ceSNicholas Bellinger " retransmission of R2TSN: 0x%08x to 0x%08x but already" 160e48354ceSNicholas Bellinger " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," 161e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 162e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 163e48354ceSNicholas Bellinger 1645a342521SBart Van Assche return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 165e48354ceSNicholas Bellinger } 166e48354ceSNicholas Bellinger 167e48354ceSNicholas Bellinger if (runlength) { 168e48354ceSNicholas Bellinger if ((begrun + runlength) > cmd->r2t_sn) { 169e48354ceSNicholas Bellinger pr_err("Command ITT: 0x%08x received R2T SNACK" 170e48354ceSNicholas Bellinger " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" 171e48354ceSNicholas Bellinger " current R2TSN: 0x%08x, protocol error.\n", 172e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); 173ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, 174ba159914SNicholas Bellinger ISCSI_REASON_BOOKMARK_INVALID, buf); 175e48354ceSNicholas Bellinger } 176e48354ceSNicholas Bellinger last_r2tsn = (begrun + runlength); 177e48354ceSNicholas Bellinger } else 178e48354ceSNicholas Bellinger last_r2tsn = cmd->r2t_sn; 179e48354ceSNicholas Bellinger 180e48354ceSNicholas Bellinger while (begrun < last_r2tsn) { 181e48354ceSNicholas Bellinger r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); 182e48354ceSNicholas Bellinger if (!r2t) 183e48354ceSNicholas Bellinger return -1; 184e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) 185e48354ceSNicholas Bellinger return -1; 186e48354ceSNicholas Bellinger 187e48354ceSNicholas Bellinger begrun++; 188e48354ceSNicholas Bellinger } 189e48354ceSNicholas Bellinger 190e48354ceSNicholas Bellinger return 0; 191e48354ceSNicholas Bellinger } 192e48354ceSNicholas Bellinger 193e48354ceSNicholas Bellinger /* 194e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 195e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 196e48354ceSNicholas Bellinger * 197e48354ceSNicholas Bellinger * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. 198e48354ceSNicholas Bellinger * 199e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 200e48354ceSNicholas Bellinger */ 201e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_yes( 202e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 203e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 204e48354ceSNicholas Bellinger { 205e48354ceSNicholas Bellinger u32 data_sn = 0, data_sn_count = 0; 206e48354ceSNicholas Bellinger u32 pdu_start = 0, seq_no = 0; 207e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 208e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 209e48354ceSNicholas Bellinger 210e48354ceSNicholas Bellinger while (begrun > data_sn++) { 211e48354ceSNicholas Bellinger data_sn_count++; 212e48354ceSNicholas Bellinger if ((dr->next_burst_len + 213e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength) < 214e48354ceSNicholas Bellinger conn->sess->sess_ops->MaxBurstLength) { 215e48354ceSNicholas Bellinger dr->read_data_done += 216e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 217e48354ceSNicholas Bellinger dr->next_burst_len += 218e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 219e48354ceSNicholas Bellinger } else { 220e48354ceSNicholas Bellinger dr->read_data_done += 221e48354ceSNicholas Bellinger (conn->sess->sess_ops->MaxBurstLength - 222e48354ceSNicholas Bellinger dr->next_burst_len); 223e48354ceSNicholas Bellinger dr->next_burst_len = 0; 224e48354ceSNicholas Bellinger pdu_start += data_sn_count; 225e48354ceSNicholas Bellinger data_sn_count = 0; 226e48354ceSNicholas Bellinger seq_no++; 227e48354ceSNicholas Bellinger } 228e48354ceSNicholas Bellinger } 229e48354ceSNicholas Bellinger 230e48354ceSNicholas Bellinger if (!conn->sess->sess_ops->DataPDUInOrder) { 231e48354ceSNicholas Bellinger cmd->seq_no = seq_no; 232e48354ceSNicholas Bellinger cmd->pdu_start = pdu_start; 233e48354ceSNicholas Bellinger cmd->pdu_send_order = data_sn_count; 234e48354ceSNicholas Bellinger } 235e48354ceSNicholas Bellinger 236e48354ceSNicholas Bellinger return 0; 237e48354ceSNicholas Bellinger } 238e48354ceSNicholas Bellinger 239e48354ceSNicholas Bellinger /* 240e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 241e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 242e48354ceSNicholas Bellinger * 243e48354ceSNicholas Bellinger * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. 244e48354ceSNicholas Bellinger * 245e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 246e48354ceSNicholas Bellinger */ 247e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_no( 248e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 249e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 250e48354ceSNicholas Bellinger { 251e48354ceSNicholas Bellinger int found_seq = 0, i; 252e48354ceSNicholas Bellinger u32 data_sn, read_data_done = 0, seq_send_order = 0; 253e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 254e48354ceSNicholas Bellinger u32 runlength = dr->runlength; 255e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 256e48354ceSNicholas Bellinger struct iscsi_seq *first_seq = NULL, *seq = NULL; 257e48354ceSNicholas Bellinger 258e48354ceSNicholas Bellinger if (!cmd->seq_list) { 259e48354ceSNicholas Bellinger pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 260e48354ceSNicholas Bellinger return -1; 261e48354ceSNicholas Bellinger } 262e48354ceSNicholas Bellinger 263e48354ceSNicholas Bellinger /* 264e48354ceSNicholas Bellinger * Calculate read_data_done for all sequences containing a 265e48354ceSNicholas Bellinger * first_datasn and last_datasn less than the BegRun. 266e48354ceSNicholas Bellinger * 267e48354ceSNicholas Bellinger * Locate the struct iscsi_seq the BegRun lies within and calculate 268e48354ceSNicholas Bellinger * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. 269e48354ceSNicholas Bellinger * 270e48354ceSNicholas Bellinger * Also use struct iscsi_seq->seq_send_order to determine where to start. 271e48354ceSNicholas Bellinger */ 272e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 273e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 274e48354ceSNicholas Bellinger 275e48354ceSNicholas Bellinger if (!seq->seq_send_order) 276e48354ceSNicholas Bellinger first_seq = seq; 277e48354ceSNicholas Bellinger 278e48354ceSNicholas Bellinger /* 279e48354ceSNicholas Bellinger * No data has been transferred for this DataIN sequence, so the 280e48354ceSNicholas Bellinger * seq->first_datasn and seq->last_datasn have not been set. 281e48354ceSNicholas Bellinger */ 282e48354ceSNicholas Bellinger if (!seq->sent) { 283e48354ceSNicholas Bellinger pr_err("Ignoring non-sent sequence 0x%08x ->" 284e48354ceSNicholas Bellinger " 0x%08x\n\n", seq->first_datasn, 285e48354ceSNicholas Bellinger seq->last_datasn); 286e48354ceSNicholas Bellinger continue; 287e48354ceSNicholas Bellinger } 288e48354ceSNicholas Bellinger 289e48354ceSNicholas Bellinger /* 290e48354ceSNicholas Bellinger * This DataIN sequence is precedes the received BegRun, add the 291e48354ceSNicholas Bellinger * total xfer_len of the sequence to read_data_done and reset 292e48354ceSNicholas Bellinger * seq->pdu_send_order. 293e48354ceSNicholas Bellinger */ 294e48354ceSNicholas Bellinger if ((seq->first_datasn < begrun) && 295e48354ceSNicholas Bellinger (seq->last_datasn < begrun)) { 296e48354ceSNicholas Bellinger pr_err("Pre BegRun sequence 0x%08x ->" 297e48354ceSNicholas Bellinger " 0x%08x\n", seq->first_datasn, 298e48354ceSNicholas Bellinger seq->last_datasn); 2998b1e1244SAndy Grover 300e48354ceSNicholas Bellinger read_data_done += cmd->seq_list[i].xfer_len; 301e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 302e48354ceSNicholas Bellinger continue; 303e48354ceSNicholas Bellinger } 304e48354ceSNicholas Bellinger 305e48354ceSNicholas Bellinger /* 306e48354ceSNicholas Bellinger * The BegRun lies within this DataIN sequence. 307e48354ceSNicholas Bellinger */ 308e48354ceSNicholas Bellinger if ((seq->first_datasn <= begrun) && 309e48354ceSNicholas Bellinger (seq->last_datasn >= begrun)) { 310e48354ceSNicholas Bellinger pr_err("Found sequence begrun: 0x%08x in" 311e48354ceSNicholas Bellinger " 0x%08x -> 0x%08x\n", begrun, 312e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 3138b1e1244SAndy Grover 314e48354ceSNicholas Bellinger seq_send_order = seq->seq_send_order; 315e48354ceSNicholas Bellinger data_sn = seq->first_datasn; 316e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 317e48354ceSNicholas Bellinger found_seq = 1; 318e48354ceSNicholas Bellinger 319e48354ceSNicholas Bellinger /* 320e48354ceSNicholas Bellinger * For DataPDUInOrder=Yes, while the first DataSN of 321e48354ceSNicholas Bellinger * the sequence is less than the received BegRun, add 322e48354ceSNicholas Bellinger * the MaxRecvDataSegmentLength to read_data_done and 323e48354ceSNicholas Bellinger * to the sequence's next_burst_len; 324e48354ceSNicholas Bellinger * 325e48354ceSNicholas Bellinger * For DataPDUInOrder=No, while the first DataSN of the 326e48354ceSNicholas Bellinger * sequence is less than the received BegRun, find the 327e48354ceSNicholas Bellinger * struct iscsi_pdu of the DataSN in question and add the 328e48354ceSNicholas Bellinger * MaxRecvDataSegmentLength to read_data_done and to the 329e48354ceSNicholas Bellinger * sequence's next_burst_len; 330e48354ceSNicholas Bellinger */ 331e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 332e48354ceSNicholas Bellinger while (data_sn < begrun) { 333e48354ceSNicholas Bellinger seq->pdu_send_order++; 334e48354ceSNicholas Bellinger read_data_done += 335e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 336e48354ceSNicholas Bellinger seq->next_burst_len += 337e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 338e48354ceSNicholas Bellinger data_sn++; 339e48354ceSNicholas Bellinger } 340e48354ceSNicholas Bellinger } else { 341e48354ceSNicholas Bellinger int j; 342e48354ceSNicholas Bellinger struct iscsi_pdu *pdu; 343e48354ceSNicholas Bellinger 344e48354ceSNicholas Bellinger while (data_sn < begrun) { 345e48354ceSNicholas Bellinger seq->pdu_send_order++; 346e48354ceSNicholas Bellinger 347e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 348e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[ 349e48354ceSNicholas Bellinger seq->pdu_start + j]; 350e48354ceSNicholas Bellinger if (pdu->data_sn == data_sn) { 351e48354ceSNicholas Bellinger read_data_done += 352e48354ceSNicholas Bellinger pdu->length; 353e48354ceSNicholas Bellinger seq->next_burst_len += 354e48354ceSNicholas Bellinger pdu->length; 355e48354ceSNicholas Bellinger } 356e48354ceSNicholas Bellinger } 357e48354ceSNicholas Bellinger data_sn++; 358e48354ceSNicholas Bellinger } 359e48354ceSNicholas Bellinger } 360e48354ceSNicholas Bellinger continue; 361e48354ceSNicholas Bellinger } 362e48354ceSNicholas Bellinger 363e48354ceSNicholas Bellinger /* 364e48354ceSNicholas Bellinger * This DataIN sequence is larger than the received BegRun, 365e48354ceSNicholas Bellinger * reset seq->pdu_send_order and continue. 366e48354ceSNicholas Bellinger */ 367e48354ceSNicholas Bellinger if ((seq->first_datasn > begrun) || 368e48354ceSNicholas Bellinger (seq->last_datasn > begrun)) { 369e48354ceSNicholas Bellinger pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", 370e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 3718b1e1244SAndy Grover 372e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 373e48354ceSNicholas Bellinger continue; 374e48354ceSNicholas Bellinger } 375e48354ceSNicholas Bellinger } 376e48354ceSNicholas Bellinger 377e48354ceSNicholas Bellinger if (!found_seq) { 378e48354ceSNicholas Bellinger if (!begrun) { 379e48354ceSNicholas Bellinger if (!first_seq) { 380e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Begrun: 0x%08x" 381e48354ceSNicholas Bellinger " but first_seq is NULL\n", 382e48354ceSNicholas Bellinger cmd->init_task_tag, begrun); 383e48354ceSNicholas Bellinger return -1; 384e48354ceSNicholas Bellinger } 385e48354ceSNicholas Bellinger seq_send_order = first_seq->seq_send_order; 386e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 387e48354ceSNicholas Bellinger goto done; 388e48354ceSNicholas Bellinger } 389e48354ceSNicholas Bellinger 390e48354ceSNicholas Bellinger pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," 391e48354ceSNicholas Bellinger " BegRun: 0x%08x, RunLength: 0x%08x while" 392e48354ceSNicholas Bellinger " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", 393e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, 394e48354ceSNicholas Bellinger (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); 395e48354ceSNicholas Bellinger return -1; 396e48354ceSNicholas Bellinger } 397e48354ceSNicholas Bellinger 398e48354ceSNicholas Bellinger done: 399e48354ceSNicholas Bellinger dr->read_data_done = read_data_done; 400e48354ceSNicholas Bellinger dr->seq_send_order = seq_send_order; 401e48354ceSNicholas Bellinger 402e48354ceSNicholas Bellinger return 0; 403e48354ceSNicholas Bellinger } 404e48354ceSNicholas Bellinger 405e48354ceSNicholas Bellinger static int iscsit_handle_recovery_datain( 406e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 407e48354ceSNicholas Bellinger unsigned char *buf, 408e48354ceSNicholas Bellinger u32 begrun, 409e48354ceSNicholas Bellinger u32 runlength) 410e48354ceSNicholas Bellinger { 411e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 412e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 413e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 414e48354ceSNicholas Bellinger 4157d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 416e48354ceSNicholas Bellinger pr_err("Ignoring ITT: 0x%08x Data SNACK\n", 417e48354ceSNicholas Bellinger cmd->init_task_tag); 418e48354ceSNicholas Bellinger return 0; 419e48354ceSNicholas Bellinger } 420e48354ceSNicholas Bellinger 421e48354ceSNicholas Bellinger /* 422e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 423e48354ceSNicholas Bellinger * of DataSNs already acknowledged by a Data ACK SNACK. 424e48354ceSNicholas Bellinger */ 425e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 426e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 427e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Data SNACK requesting" 428e48354ceSNicholas Bellinger " retransmission of DataSN: 0x%08x to 0x%08x but" 429e48354ceSNicholas Bellinger " already acked to DataSN: 0x%08x by Data ACK SNACK," 430e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 431e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 432e48354ceSNicholas Bellinger 433ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 434e48354ceSNicholas Bellinger } 435e48354ceSNicholas Bellinger 436e48354ceSNicholas Bellinger /* 437e48354ceSNicholas Bellinger * Make sure BegRun and RunLength in the Data SNACK are sane. 438e48354ceSNicholas Bellinger * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. 439e48354ceSNicholas Bellinger */ 440e48354ceSNicholas Bellinger if ((begrun + runlength) > (cmd->data_sn - 1)) { 441e48354ceSNicholas Bellinger pr_err("Initiator requesting BegRun: 0x%08x, RunLength" 442e48354ceSNicholas Bellinger ": 0x%08x greater than maximum DataSN: 0x%08x.\n", 443e48354ceSNicholas Bellinger begrun, runlength, (cmd->data_sn - 1)); 444ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, 445ba159914SNicholas Bellinger buf); 446e48354ceSNicholas Bellinger } 447e48354ceSNicholas Bellinger 448e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 449e48354ceSNicholas Bellinger if (!dr) 450ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 451ba159914SNicholas Bellinger buf); 452e48354ceSNicholas Bellinger 453e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = begrun; 454e48354ceSNicholas Bellinger dr->runlength = runlength; 455e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 456e48354ceSNicholas Bellinger dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; 457e48354ceSNicholas Bellinger 458e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 459e48354ceSNicholas Bellinger 460e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 461e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 462e48354ceSNicholas Bellinger 463e48354ceSNicholas Bellinger return 0; 464e48354ceSNicholas Bellinger } 465e48354ceSNicholas Bellinger 466e48354ceSNicholas Bellinger int iscsit_handle_recovery_datain_or_r2t( 467e48354ceSNicholas Bellinger struct iscsi_conn *conn, 468e48354ceSNicholas Bellinger unsigned char *buf, 46966c7db68SChristoph Hellwig itt_t init_task_tag, 470e48354ceSNicholas Bellinger u32 targ_xfer_tag, 471e48354ceSNicholas Bellinger u32 begrun, 472e48354ceSNicholas Bellinger u32 runlength) 473e48354ceSNicholas Bellinger { 474e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 475e48354ceSNicholas Bellinger 476e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); 477e48354ceSNicholas Bellinger if (!cmd) 478e48354ceSNicholas Bellinger return 0; 479e48354ceSNicholas Bellinger 480e48354ceSNicholas Bellinger /* 481e48354ceSNicholas Bellinger * FIXME: This will not work for bidi commands. 482e48354ceSNicholas Bellinger */ 483e48354ceSNicholas Bellinger switch (cmd->data_direction) { 484e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 485e48354ceSNicholas Bellinger return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); 486e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 487e48354ceSNicholas Bellinger return iscsit_handle_recovery_datain(cmd, buf, begrun, 488e48354ceSNicholas Bellinger runlength); 489e48354ceSNicholas Bellinger default: 490e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 491e48354ceSNicholas Bellinger cmd->data_direction); 492e48354ceSNicholas Bellinger return -1; 493e48354ceSNicholas Bellinger } 494e48354ceSNicholas Bellinger 495e48354ceSNicholas Bellinger return 0; 496e48354ceSNicholas Bellinger } 497e48354ceSNicholas Bellinger 498e48354ceSNicholas Bellinger /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ 499e48354ceSNicholas Bellinger int iscsit_handle_status_snack( 500e48354ceSNicholas Bellinger struct iscsi_conn *conn, 50166c7db68SChristoph Hellwig itt_t init_task_tag, 502e48354ceSNicholas Bellinger u32 targ_xfer_tag, 503e48354ceSNicholas Bellinger u32 begrun, 504e48354ceSNicholas Bellinger u32 runlength) 505e48354ceSNicholas Bellinger { 506e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 507e48354ceSNicholas Bellinger u32 last_statsn; 508e48354ceSNicholas Bellinger int found_cmd; 509e48354ceSNicholas Bellinger 510752d8680SNicholas Bellinger if (!begrun) { 511752d8680SNicholas Bellinger begrun = conn->exp_statsn; 512752d8680SNicholas Bellinger } else if (conn->exp_statsn > begrun) { 513e48354ceSNicholas Bellinger pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" 514e48354ceSNicholas Bellinger " 0x%08x but already got ExpStatSN: 0x%08x on CID:" 515e48354ceSNicholas Bellinger " %hu.\n", begrun, runlength, conn->exp_statsn, 516e48354ceSNicholas Bellinger conn->cid); 517e48354ceSNicholas Bellinger return 0; 518e48354ceSNicholas Bellinger } 519e48354ceSNicholas Bellinger 520e48354ceSNicholas Bellinger last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); 521e48354ceSNicholas Bellinger 522e48354ceSNicholas Bellinger while (begrun < last_statsn) { 523e48354ceSNicholas Bellinger found_cmd = 0; 524e48354ceSNicholas Bellinger 525e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 5262fbb471eSAndy Grover list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 527e48354ceSNicholas Bellinger if (cmd->stat_sn == begrun) { 528e48354ceSNicholas Bellinger found_cmd = 1; 529e48354ceSNicholas Bellinger break; 530e48354ceSNicholas Bellinger } 531e48354ceSNicholas Bellinger } 532e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 533e48354ceSNicholas Bellinger 534e48354ceSNicholas Bellinger if (!found_cmd) { 535e48354ceSNicholas Bellinger pr_err("Unable to find StatSN: 0x%08x for" 536e48354ceSNicholas Bellinger " a Status SNACK, assuming this was a" 537e48354ceSNicholas Bellinger " protactic SNACK for an untransmitted" 538e48354ceSNicholas Bellinger " StatSN, ignoring.\n", begrun); 539e48354ceSNicholas Bellinger begrun++; 540e48354ceSNicholas Bellinger continue; 541e48354ceSNicholas Bellinger } 542e48354ceSNicholas Bellinger 543e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 544e48354ceSNicholas Bellinger if (cmd->i_state == ISTATE_SEND_DATAIN) { 545e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 546e48354ceSNicholas Bellinger pr_err("Ignoring Status SNACK for BegRun:" 547e48354ceSNicholas Bellinger " 0x%08x, RunLength: 0x%08x, assuming this was" 548e48354ceSNicholas Bellinger " a protactic SNACK for an untransmitted" 549e48354ceSNicholas Bellinger " StatSN\n", begrun, runlength); 550e48354ceSNicholas Bellinger begrun++; 551e48354ceSNicholas Bellinger continue; 552e48354ceSNicholas Bellinger } 553e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 554e48354ceSNicholas Bellinger 555e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; 556e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 557e48354ceSNicholas Bellinger begrun++; 558e48354ceSNicholas Bellinger } 559e48354ceSNicholas Bellinger 560e48354ceSNicholas Bellinger return 0; 561e48354ceSNicholas Bellinger } 562e48354ceSNicholas Bellinger 563e48354ceSNicholas Bellinger int iscsit_handle_data_ack( 564e48354ceSNicholas Bellinger struct iscsi_conn *conn, 565e48354ceSNicholas Bellinger u32 targ_xfer_tag, 566e48354ceSNicholas Bellinger u32 begrun, 567e48354ceSNicholas Bellinger u32 runlength) 568e48354ceSNicholas Bellinger { 569e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 570e48354ceSNicholas Bellinger 571e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); 572e48354ceSNicholas Bellinger if (!cmd) { 573e48354ceSNicholas Bellinger pr_err("Data ACK SNACK for TTT: 0x%08x is" 574e48354ceSNicholas Bellinger " invalid.\n", targ_xfer_tag); 575e48354ceSNicholas Bellinger return -1; 576e48354ceSNicholas Bellinger } 577e48354ceSNicholas Bellinger 578e48354ceSNicholas Bellinger if (begrun <= cmd->acked_data_sn) { 579e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" 580e48354ceSNicholas Bellinger " less than the already acked DataSN: 0x%08x.\n", 581e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, cmd->acked_data_sn); 582e48354ceSNicholas Bellinger return -1; 583e48354ceSNicholas Bellinger } 584e48354ceSNicholas Bellinger 585e48354ceSNicholas Bellinger /* 586e48354ceSNicholas Bellinger * For Data ACK SNACK, BegRun is the next expected DataSN. 587e48354ceSNicholas Bellinger * (see iSCSI v19: 10.16.6) 588e48354ceSNicholas Bellinger */ 589e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 590e48354ceSNicholas Bellinger cmd->acked_data_sn = (begrun - 1); 591e48354ceSNicholas Bellinger 592e48354ceSNicholas Bellinger pr_debug("Received Data ACK SNACK for ITT: 0x%08x," 593e48354ceSNicholas Bellinger " updated acked DataSN to 0x%08x.\n", 594e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->acked_data_sn); 595e48354ceSNicholas Bellinger 596e48354ceSNicholas Bellinger return 0; 597e48354ceSNicholas Bellinger } 598e48354ceSNicholas Bellinger 599e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t( 600e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 601e48354ceSNicholas Bellinger u32 offset, 602e48354ceSNicholas Bellinger u32 xfer_len) 603e48354ceSNicholas Bellinger { 604e48354ceSNicholas Bellinger int ret; 605e48354ceSNicholas Bellinger 606e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 607e48354ceSNicholas Bellinger ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); 608e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 609e48354ceSNicholas Bellinger 610e48354ceSNicholas Bellinger return ret; 611e48354ceSNicholas Bellinger } 612e48354ceSNicholas Bellinger 613e48354ceSNicholas Bellinger int iscsit_dataout_datapduinorder_no_fbit( 614e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 615e48354ceSNicholas Bellinger struct iscsi_pdu *pdu) 616e48354ceSNicholas Bellinger { 617e48354ceSNicholas Bellinger int i, send_recovery_r2t = 0, recovery = 0; 618e48354ceSNicholas Bellinger u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; 619e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 620e48354ceSNicholas Bellinger struct iscsi_pdu *first_pdu = NULL; 621e48354ceSNicholas Bellinger 622e48354ceSNicholas Bellinger /* 623e48354ceSNicholas Bellinger * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count 624e48354ceSNicholas Bellinger * of the DataOUT sequence. 625e48354ceSNicholas Bellinger */ 626e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 627e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 628e48354ceSNicholas Bellinger if (cmd->pdu_list[i].seq_no == pdu->seq_no) { 629e48354ceSNicholas Bellinger if (!first_pdu) 630e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[i]; 631e48354ceSNicholas Bellinger xfer_len += cmd->pdu_list[i].length; 632e48354ceSNicholas Bellinger pdu_count++; 633e48354ceSNicholas Bellinger } else if (pdu_count) 634e48354ceSNicholas Bellinger break; 635e48354ceSNicholas Bellinger } 636e48354ceSNicholas Bellinger } else { 637e48354ceSNicholas Bellinger struct iscsi_seq *seq = cmd->seq_ptr; 638e48354ceSNicholas Bellinger 639e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[seq->pdu_start]; 640e48354ceSNicholas Bellinger pdu_count = seq->pdu_count; 641e48354ceSNicholas Bellinger } 642e48354ceSNicholas Bellinger 643e48354ceSNicholas Bellinger if (!first_pdu || !pdu_count) 644e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 645e48354ceSNicholas Bellinger 646e48354ceSNicholas Bellinger /* 647e48354ceSNicholas Bellinger * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. 648e48354ceSNicholas Bellinger * The following ugly logic does batching of not received PDUs. 649e48354ceSNicholas Bellinger */ 650e48354ceSNicholas Bellinger for (i = 0; i < pdu_count; i++) { 651e48354ceSNicholas Bellinger if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { 652e48354ceSNicholas Bellinger if (!send_recovery_r2t) 653e48354ceSNicholas Bellinger continue; 654e48354ceSNicholas Bellinger 655e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 656e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 657e48354ceSNicholas Bellinger 658e48354ceSNicholas Bellinger send_recovery_r2t = length = offset = 0; 659e48354ceSNicholas Bellinger continue; 660e48354ceSNicholas Bellinger } 661e48354ceSNicholas Bellinger /* 662e48354ceSNicholas Bellinger * Set recovery = 1 for any missing, CRC failed, or timed 663e48354ceSNicholas Bellinger * out PDUs to let the DataOUT logic know that this sequence 664e48354ceSNicholas Bellinger * has not been completed yet. 665e48354ceSNicholas Bellinger * 666e48354ceSNicholas Bellinger * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. 667e48354ceSNicholas Bellinger * We assume if the PDU either failed CRC or timed out 668e48354ceSNicholas Bellinger * that a Recovery R2T has already been sent. 669e48354ceSNicholas Bellinger */ 670e48354ceSNicholas Bellinger recovery = 1; 671e48354ceSNicholas Bellinger 672e48354ceSNicholas Bellinger if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) 673e48354ceSNicholas Bellinger continue; 674e48354ceSNicholas Bellinger 675e48354ceSNicholas Bellinger if (!offset) 676e48354ceSNicholas Bellinger offset = first_pdu[i].offset; 677e48354ceSNicholas Bellinger length += first_pdu[i].length; 678e48354ceSNicholas Bellinger 679e48354ceSNicholas Bellinger send_recovery_r2t = 1; 680e48354ceSNicholas Bellinger } 681e48354ceSNicholas Bellinger 682e48354ceSNicholas Bellinger if (send_recovery_r2t) 683e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 684e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 685e48354ceSNicholas Bellinger 686e48354ceSNicholas Bellinger return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; 687e48354ceSNicholas Bellinger } 688e48354ceSNicholas Bellinger 689e48354ceSNicholas Bellinger static int iscsit_recalculate_dataout_values( 690e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 691e48354ceSNicholas Bellinger u32 pdu_offset, 692e48354ceSNicholas Bellinger u32 pdu_length, 693e48354ceSNicholas Bellinger u32 *r2t_offset, 694e48354ceSNicholas Bellinger u32 *r2t_length) 695e48354ceSNicholas Bellinger { 696e48354ceSNicholas Bellinger int i; 697e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 698e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 699e48354ceSNicholas Bellinger 700e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 701e48354ceSNicholas Bellinger cmd->data_sn = 0; 702e48354ceSNicholas Bellinger 703e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 704e48354ceSNicholas Bellinger *r2t_offset = cmd->write_data_done; 705e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - 706e48354ceSNicholas Bellinger cmd->write_data_done); 707e48354ceSNicholas Bellinger return 0; 708e48354ceSNicholas Bellinger } 709e48354ceSNicholas Bellinger 710e48354ceSNicholas Bellinger *r2t_offset = cmd->seq_start_offset; 711e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); 712e48354ceSNicholas Bellinger 713e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 714e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 715e48354ceSNicholas Bellinger 716e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 717e48354ceSNicholas Bellinger continue; 718e48354ceSNicholas Bellinger 719e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 720e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 721e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 722e48354ceSNicholas Bellinger if (!cmd->unsolicited_data) 723e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 724e48354ceSNicholas Bellinger else 725e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 726e48354ceSNicholas Bellinger 727e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 728e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 729e48354ceSNicholas Bellinger } 730e48354ceSNicholas Bellinger } 731e48354ceSNicholas Bellinger } else { 732e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 733e48354ceSNicholas Bellinger 734e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); 735e48354ceSNicholas Bellinger if (!seq) 736e48354ceSNicholas Bellinger return -1; 737e48354ceSNicholas Bellinger 738e48354ceSNicholas Bellinger *r2t_offset = seq->orig_offset; 739e48354ceSNicholas Bellinger *r2t_length = seq->xfer_len; 740e48354ceSNicholas Bellinger 741e48354ceSNicholas Bellinger cmd->write_data_done -= (seq->offset - seq->orig_offset); 742e48354ceSNicholas Bellinger if (cmd->immediate_data) 743e48354ceSNicholas Bellinger cmd->first_burst_len = cmd->write_data_done; 744e48354ceSNicholas Bellinger 745e48354ceSNicholas Bellinger seq->data_sn = 0; 746e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 747e48354ceSNicholas Bellinger seq->next_burst_len = 0; 748e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 749e48354ceSNicholas Bellinger 750e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 751e48354ceSNicholas Bellinger return 0; 752e48354ceSNicholas Bellinger 753e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 754e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 755e48354ceSNicholas Bellinger 756e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 757e48354ceSNicholas Bellinger continue; 758e48354ceSNicholas Bellinger 759e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 760e48354ceSNicholas Bellinger } 761e48354ceSNicholas Bellinger } 762e48354ceSNicholas Bellinger 763e48354ceSNicholas Bellinger return 0; 764e48354ceSNicholas Bellinger } 765e48354ceSNicholas Bellinger 766e48354ceSNicholas Bellinger int iscsit_recover_dataout_sequence( 767e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 768e48354ceSNicholas Bellinger u32 pdu_offset, 769e48354ceSNicholas Bellinger u32 pdu_length) 770e48354ceSNicholas Bellinger { 771e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 772e48354ceSNicholas Bellinger 773e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 774e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 775e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 776e48354ceSNicholas Bellinger 777e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 778e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 779e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 780e48354ceSNicholas Bellinger 781e48354ceSNicholas Bellinger iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); 782e48354ceSNicholas Bellinger 783e48354ceSNicholas Bellinger return DATAOUT_WITHIN_COMMAND_RECOVERY; 784e48354ceSNicholas Bellinger } 785e48354ceSNicholas Bellinger 786e48354ceSNicholas Bellinger static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) 787e48354ceSNicholas Bellinger { 788e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; 789e48354ceSNicholas Bellinger 790e48354ceSNicholas Bellinger ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); 791e48354ceSNicholas Bellinger if (!ooo_cmdsn) { 792e48354ceSNicholas Bellinger pr_err("Unable to allocate memory for" 793e48354ceSNicholas Bellinger " struct iscsi_ooo_cmdsn.\n"); 794e48354ceSNicholas Bellinger return NULL; 795e48354ceSNicholas Bellinger } 796e48354ceSNicholas Bellinger INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); 797e48354ceSNicholas Bellinger 798e48354ceSNicholas Bellinger return ooo_cmdsn; 799e48354ceSNicholas Bellinger } 800e48354ceSNicholas Bellinger 801e48354ceSNicholas Bellinger /* 802e48354ceSNicholas Bellinger * Called with sess->cmdsn_mutex held. 803e48354ceSNicholas Bellinger */ 804e48354ceSNicholas Bellinger static int iscsit_attach_ooo_cmdsn( 805e48354ceSNicholas Bellinger struct iscsi_session *sess, 806e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 807e48354ceSNicholas Bellinger { 808e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; 809e48354ceSNicholas Bellinger /* 810e48354ceSNicholas Bellinger * We attach the struct iscsi_ooo_cmdsn entry to the out of order 811e48354ceSNicholas Bellinger * list in increasing CmdSN order. 812e48354ceSNicholas Bellinger * This allows iscsi_execute_ooo_cmdsns() to detect any 813e48354ceSNicholas Bellinger * additional CmdSN holes while performing delayed execution. 814e48354ceSNicholas Bellinger */ 815e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 816e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 817e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 818e48354ceSNicholas Bellinger else { 819e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 820e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 821e48354ceSNicholas Bellinger /* 822e48354ceSNicholas Bellinger * CmdSN is greater than the tail of the list. 823e48354ceSNicholas Bellinger */ 8243eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) 825e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 826e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 827e48354ceSNicholas Bellinger else { 828e48354ceSNicholas Bellinger /* 829e48354ceSNicholas Bellinger * CmdSN is either lower than the head, or somewhere 830e48354ceSNicholas Bellinger * in the middle. 831e48354ceSNicholas Bellinger */ 832e48354ceSNicholas Bellinger list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, 833e48354ceSNicholas Bellinger ooo_list) { 8343eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) 835e48354ceSNicholas Bellinger continue; 836e48354ceSNicholas Bellinger 8373eccfdb0SShlomo Pongratz /* Insert before this entry */ 838e48354ceSNicholas Bellinger list_add(&ooo_cmdsn->ooo_list, 8393eccfdb0SShlomo Pongratz ooo_tmp->ooo_list.prev); 840e48354ceSNicholas Bellinger break; 841e48354ceSNicholas Bellinger } 842e48354ceSNicholas Bellinger } 843e48354ceSNicholas Bellinger } 844e48354ceSNicholas Bellinger 845e48354ceSNicholas Bellinger return 0; 846e48354ceSNicholas Bellinger } 847e48354ceSNicholas Bellinger 848e48354ceSNicholas Bellinger /* 849e48354ceSNicholas Bellinger * Removes an struct iscsi_ooo_cmdsn from a session's list, 850e48354ceSNicholas Bellinger * called with struct iscsi_session->cmdsn_mutex held. 851e48354ceSNicholas Bellinger */ 852e48354ceSNicholas Bellinger void iscsit_remove_ooo_cmdsn( 853e48354ceSNicholas Bellinger struct iscsi_session *sess, 854e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 855e48354ceSNicholas Bellinger { 856e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 857e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 858e48354ceSNicholas Bellinger } 859e48354ceSNicholas Bellinger 860e48354ceSNicholas Bellinger void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) 861e48354ceSNicholas Bellinger { 862e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn; 863e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 864e48354ceSNicholas Bellinger 865e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 866e48354ceSNicholas Bellinger list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { 867e48354ceSNicholas Bellinger if (ooo_cmdsn->cid != conn->cid) 868e48354ceSNicholas Bellinger continue; 869e48354ceSNicholas Bellinger 870e48354ceSNicholas Bellinger ooo_cmdsn->cmd = NULL; 871e48354ceSNicholas Bellinger } 872e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 873e48354ceSNicholas Bellinger } 874e48354ceSNicholas Bellinger 875e48354ceSNicholas Bellinger /* 876e48354ceSNicholas Bellinger * Called with sess->cmdsn_mutex held. 877e48354ceSNicholas Bellinger */ 878e48354ceSNicholas Bellinger int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) 879e48354ceSNicholas Bellinger { 880e48354ceSNicholas Bellinger int ooo_count = 0; 881e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 882e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 883e48354ceSNicholas Bellinger 884e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 885e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 886e48354ceSNicholas Bellinger if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) 887e48354ceSNicholas Bellinger continue; 888e48354ceSNicholas Bellinger 889e48354ceSNicholas Bellinger if (!ooo_cmdsn->cmd) { 890e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 891e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 892e48354ceSNicholas Bellinger continue; 893e48354ceSNicholas Bellinger } 894e48354ceSNicholas Bellinger 895e48354ceSNicholas Bellinger cmd = ooo_cmdsn->cmd; 896e48354ceSNicholas Bellinger cmd->i_state = cmd->deferred_i_state; 897e48354ceSNicholas Bellinger ooo_count++; 898e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 899e48354ceSNicholas Bellinger pr_debug("Executing out of order CmdSN: 0x%08x," 900e48354ceSNicholas Bellinger " incremented ExpCmdSN to 0x%08x.\n", 901e48354ceSNicholas Bellinger cmd->cmd_sn, sess->exp_cmd_sn); 902e48354ceSNicholas Bellinger 903e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 904e48354ceSNicholas Bellinger 905e48354ceSNicholas Bellinger if (iscsit_execute_cmd(cmd, 1) < 0) 906e48354ceSNicholas Bellinger return -1; 907e48354ceSNicholas Bellinger 908e48354ceSNicholas Bellinger continue; 909e48354ceSNicholas Bellinger } 910e48354ceSNicholas Bellinger 911e48354ceSNicholas Bellinger return ooo_count; 912e48354ceSNicholas Bellinger } 913e48354ceSNicholas Bellinger 914e48354ceSNicholas Bellinger /* 915e48354ceSNicholas Bellinger * Called either: 916e48354ceSNicholas Bellinger * 917e48354ceSNicholas Bellinger * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() 918e48354ceSNicholas Bellinger * or iscsi_check_received_cmdsn(). 919e48354ceSNicholas Bellinger * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions 920e48354ceSNicholas Bellinger * for immediate commands. 921e48354ceSNicholas Bellinger */ 922e48354ceSNicholas Bellinger int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) 923e48354ceSNicholas Bellinger { 924e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 9253e1c81a9SNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 926e48354ceSNicholas Bellinger int lr = 0; 927e48354ceSNicholas Bellinger 928e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 929e48354ceSNicholas Bellinger if (ooo) 930e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_OOO_CMDSN; 931e48354ceSNicholas Bellinger 932e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 933e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 934e48354ceSNicholas Bellinger /* 935e48354ceSNicholas Bellinger * Go ahead and send the CHECK_CONDITION status for 936de103c93SChristoph Hellwig * any SCSI CDB exceptions that may have occurred. 937e48354ceSNicholas Bellinger */ 938de103c93SChristoph Hellwig if (cmd->sense_reason) { 939de103c93SChristoph Hellwig if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { 940e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 941e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 942e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 943e48354ceSNicholas Bellinger cmd->i_state); 944e48354ceSNicholas Bellinger return 0; 945e48354ceSNicholas Bellinger } 946e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 947e48354ceSNicholas Bellinger /* 948e48354ceSNicholas Bellinger * Determine if delayed TASK_ABORTED status for WRITEs 949e48354ceSNicholas Bellinger * should be sent now if no unsolicited data out 950e48354ceSNicholas Bellinger * payloads are expected, or if the delayed status 951e48354ceSNicholas Bellinger * should be sent after unsolicited data out with 952e48354ceSNicholas Bellinger * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out() 953e48354ceSNicholas Bellinger */ 954e48354ceSNicholas Bellinger if (transport_check_aborted_status(se_cmd, 955e48354ceSNicholas Bellinger (cmd->unsolicited_data == 0)) != 0) 956e48354ceSNicholas Bellinger return 0; 957e48354ceSNicholas Bellinger /* 958e48354ceSNicholas Bellinger * Otherwise send CHECK_CONDITION and sense for 959e48354ceSNicholas Bellinger * exception 960e48354ceSNicholas Bellinger */ 961e48354ceSNicholas Bellinger return transport_send_check_condition_and_sense(se_cmd, 962de103c93SChristoph Hellwig cmd->sense_reason, 0); 963e48354ceSNicholas Bellinger } 964e48354ceSNicholas Bellinger /* 965e48354ceSNicholas Bellinger * Special case for delayed CmdSN with Immediate 966e48354ceSNicholas Bellinger * Data and/or Unsolicited Data Out attached. 967e48354ceSNicholas Bellinger */ 968e48354ceSNicholas Bellinger if (cmd->immediate_data) { 969e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 970e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 97167441b68SChristoph Hellwig target_execute_cmd(&cmd->se_cmd); 97267441b68SChristoph Hellwig return 0; 973e48354ceSNicholas Bellinger } 974e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 975e48354ceSNicholas Bellinger 976e48354ceSNicholas Bellinger if (!(cmd->cmd_flags & 977e48354ceSNicholas Bellinger ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 978e48354ceSNicholas Bellinger /* 979e48354ceSNicholas Bellinger * Send the delayed TASK_ABORTED status for 980e48354ceSNicholas Bellinger * WRITEs if no more unsolicitied data is 981e48354ceSNicholas Bellinger * expected. 982e48354ceSNicholas Bellinger */ 983e48354ceSNicholas Bellinger if (transport_check_aborted_status(se_cmd, 1) 984e48354ceSNicholas Bellinger != 0) 985e48354ceSNicholas Bellinger return 0; 986e48354ceSNicholas Bellinger 987e48354ceSNicholas Bellinger iscsit_set_dataout_sequence_values(cmd); 9883e1c81a9SNicholas Bellinger conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 989e48354ceSNicholas Bellinger } 990e48354ceSNicholas Bellinger return 0; 991e48354ceSNicholas Bellinger } 992e48354ceSNicholas Bellinger /* 993e48354ceSNicholas Bellinger * The default handler. 994e48354ceSNicholas Bellinger */ 995e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 996e48354ceSNicholas Bellinger 997e48354ceSNicholas Bellinger if ((cmd->data_direction == DMA_TO_DEVICE) && 998e48354ceSNicholas Bellinger !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 999e48354ceSNicholas Bellinger /* 1000e48354ceSNicholas Bellinger * Send the delayed TASK_ABORTED status for WRITEs if 1001e48354ceSNicholas Bellinger * no more nsolicitied data is expected. 1002e48354ceSNicholas Bellinger */ 1003e48354ceSNicholas Bellinger if (transport_check_aborted_status(se_cmd, 1) != 0) 1004e48354ceSNicholas Bellinger return 0; 1005e48354ceSNicholas Bellinger 10063e1c81a9SNicholas Bellinger iscsit_set_unsoliticed_dataout(cmd); 1007e48354ceSNicholas Bellinger } 1008e48354ceSNicholas Bellinger return transport_handle_cdb_direct(&cmd->se_cmd); 1009e48354ceSNicholas Bellinger 1010e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 1011e48354ceSNicholas Bellinger case ISCSI_OP_TEXT: 1012e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1013e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 1014e48354ceSNicholas Bellinger break; 1015e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_TMFUNC: 1016de103c93SChristoph Hellwig if (cmd->se_cmd.se_tmr_req->response) { 1017e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1018e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 1019e48354ceSNicholas Bellinger cmd->i_state); 1020e48354ceSNicholas Bellinger return 0; 1021e48354ceSNicholas Bellinger } 1022e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1023e48354ceSNicholas Bellinger 1024e48354ceSNicholas Bellinger return transport_generic_handle_tmr(&cmd->se_cmd); 1025e48354ceSNicholas Bellinger case ISCSI_OP_LOGOUT: 1026e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1027e48354ceSNicholas Bellinger switch (cmd->logout_reason) { 1028e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 1029e48354ceSNicholas Bellinger lr = iscsit_logout_closesession(cmd, cmd->conn); 1030e48354ceSNicholas Bellinger break; 1031e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 1032e48354ceSNicholas Bellinger lr = iscsit_logout_closeconnection(cmd, cmd->conn); 1033e48354ceSNicholas Bellinger break; 1034e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_RECOVERY: 1035e48354ceSNicholas Bellinger lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); 1036e48354ceSNicholas Bellinger break; 1037e48354ceSNicholas Bellinger default: 1038e48354ceSNicholas Bellinger pr_err("Unknown iSCSI Logout Request Code:" 1039e48354ceSNicholas Bellinger " 0x%02x\n", cmd->logout_reason); 1040e48354ceSNicholas Bellinger return -1; 1041e48354ceSNicholas Bellinger } 1042e48354ceSNicholas Bellinger 1043e48354ceSNicholas Bellinger return lr; 1044e48354ceSNicholas Bellinger default: 1045e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1046e48354ceSNicholas Bellinger pr_err("Cannot perform out of order execution for" 1047e48354ceSNicholas Bellinger " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); 1048e48354ceSNicholas Bellinger return -1; 1049e48354ceSNicholas Bellinger } 1050e48354ceSNicholas Bellinger 1051e48354ceSNicholas Bellinger return 0; 1052e48354ceSNicholas Bellinger } 1053e48354ceSNicholas Bellinger 1054e48354ceSNicholas Bellinger void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) 1055e48354ceSNicholas Bellinger { 1056e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 1057e48354ceSNicholas Bellinger 1058e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 1059e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 1060e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 1061e48354ceSNicholas Bellinger 1062e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 1063e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1064e48354ceSNicholas Bellinger } 1065e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 1066e48354ceSNicholas Bellinger } 1067e48354ceSNicholas Bellinger 1068e48354ceSNicholas Bellinger int iscsit_handle_ooo_cmdsn( 1069e48354ceSNicholas Bellinger struct iscsi_session *sess, 1070e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1071e48354ceSNicholas Bellinger u32 cmdsn) 1072e48354ceSNicholas Bellinger { 1073e48354ceSNicholas Bellinger int batch = 0; 1074e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; 1075e48354ceSNicholas Bellinger 1076e48354ceSNicholas Bellinger cmd->deferred_i_state = cmd->i_state; 1077e48354ceSNicholas Bellinger cmd->i_state = ISTATE_DEFERRED_CMD; 1078e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_OOO_CMDSN; 1079e48354ceSNicholas Bellinger 1080e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 1081e48354ceSNicholas Bellinger batch = 1; 1082e48354ceSNicholas Bellinger else { 1083e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 1084e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 1085e48354ceSNicholas Bellinger if (ooo_tail->cmdsn != (cmdsn - 1)) 1086e48354ceSNicholas Bellinger batch = 1; 1087e48354ceSNicholas Bellinger } 1088e48354ceSNicholas Bellinger 1089e48354ceSNicholas Bellinger ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); 1090e48354ceSNicholas Bellinger if (!ooo_cmdsn) 1091561bf158SNicholas Bellinger return -ENOMEM; 1092e48354ceSNicholas Bellinger 1093e48354ceSNicholas Bellinger ooo_cmdsn->cmd = cmd; 1094e48354ceSNicholas Bellinger ooo_cmdsn->batch_count = (batch) ? 1095e48354ceSNicholas Bellinger (cmdsn - sess->exp_cmd_sn) : 1; 1096e48354ceSNicholas Bellinger ooo_cmdsn->cid = cmd->conn->cid; 1097e48354ceSNicholas Bellinger ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; 1098e48354ceSNicholas Bellinger ooo_cmdsn->cmdsn = cmdsn; 1099e48354ceSNicholas Bellinger 1100e48354ceSNicholas Bellinger if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { 1101e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1102561bf158SNicholas Bellinger return -ENOMEM; 1103e48354ceSNicholas Bellinger } 1104e48354ceSNicholas Bellinger 1105561bf158SNicholas Bellinger return 0; 1106e48354ceSNicholas Bellinger } 1107e48354ceSNicholas Bellinger 1108e48354ceSNicholas Bellinger static int iscsit_set_dataout_timeout_values( 1109e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1110e48354ceSNicholas Bellinger u32 *offset, 1111e48354ceSNicholas Bellinger u32 *length) 1112e48354ceSNicholas Bellinger { 1113e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1114e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 1115e48354ceSNicholas Bellinger 1116e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 1117e48354ceSNicholas Bellinger *offset = 0; 1118e48354ceSNicholas Bellinger *length = (conn->sess->sess_ops->FirstBurstLength > 1119ebf1d95cSAndy Grover cmd->se_cmd.data_length) ? 1120ebf1d95cSAndy Grover cmd->se_cmd.data_length : 1121e48354ceSNicholas Bellinger conn->sess->sess_ops->FirstBurstLength; 1122e48354ceSNicholas Bellinger return 0; 1123e48354ceSNicholas Bellinger } 1124e48354ceSNicholas Bellinger 1125e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 1126e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 1127e48354ceSNicholas Bellinger pr_err("cmd->cmd_r2t_list is empty!\n"); 1128e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1129e48354ceSNicholas Bellinger return -1; 1130e48354ceSNicholas Bellinger } 1131e48354ceSNicholas Bellinger 1132e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 1133e48354ceSNicholas Bellinger if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { 1134e48354ceSNicholas Bellinger *offset = r2t->offset; 1135e48354ceSNicholas Bellinger *length = r2t->xfer_len; 1136e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1137e48354ceSNicholas Bellinger return 0; 1138e48354ceSNicholas Bellinger } 1139e48354ceSNicholas Bellinger } 1140e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1141e48354ceSNicholas Bellinger 1142e48354ceSNicholas Bellinger pr_err("Unable to locate any incomplete DataOUT" 1143e48354ceSNicholas Bellinger " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); 1144e48354ceSNicholas Bellinger 1145e48354ceSNicholas Bellinger return -1; 1146e48354ceSNicholas Bellinger } 1147e48354ceSNicholas Bellinger 1148e48354ceSNicholas Bellinger /* 1149e48354ceSNicholas Bellinger * NOTE: Called from interrupt (timer) context. 1150e48354ceSNicholas Bellinger */ 11518a47aa9dSBart Van Assche void iscsit_handle_dataout_timeout(unsigned long data) 1152e48354ceSNicholas Bellinger { 1153e48354ceSNicholas Bellinger u32 pdu_length = 0, pdu_offset = 0; 1154e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 1155e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; 1156e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1157e48354ceSNicholas Bellinger struct iscsi_session *sess = NULL; 1158e48354ceSNicholas Bellinger struct iscsi_node_attrib *na; 1159e48354ceSNicholas Bellinger 1160e48354ceSNicholas Bellinger iscsit_inc_conn_usage_count(conn); 1161e48354ceSNicholas Bellinger 1162e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1163e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { 1164e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1165e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1166e48354ceSNicholas Bellinger return; 1167e48354ceSNicholas Bellinger } 1168e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1169e48354ceSNicholas Bellinger sess = conn->sess; 1170e48354ceSNicholas Bellinger na = iscsit_tpg_get_node_attrib(sess); 1171e48354ceSNicholas Bellinger 1172e48354ceSNicholas Bellinger if (!sess->sess_ops->ErrorRecoveryLevel) { 1173e48354ceSNicholas Bellinger pr_debug("Unable to recover from DataOut timeout while" 1174e48354ceSNicholas Bellinger " in ERL=0.\n"); 1175e48354ceSNicholas Bellinger goto failure; 1176e48354ceSNicholas Bellinger } 1177e48354ceSNicholas Bellinger 1178e48354ceSNicholas Bellinger if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { 1179e48354ceSNicholas Bellinger pr_debug("Command ITT: 0x%08x exceeded max retries" 1180e48354ceSNicholas Bellinger " for DataOUT timeout %u, closing iSCSI connection.\n", 1181e48354ceSNicholas Bellinger cmd->init_task_tag, na->dataout_timeout_retries); 1182e48354ceSNicholas Bellinger goto failure; 1183e48354ceSNicholas Bellinger } 1184e48354ceSNicholas Bellinger 1185e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 1186e48354ceSNicholas Bellinger 1187e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 1188e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 1189e48354ceSNicholas Bellinger pdu_offset = cmd->write_data_done; 1190e48354ceSNicholas Bellinger if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - 1191ebf1d95cSAndy Grover cmd->next_burst_len)) > cmd->se_cmd.data_length) 1192ebf1d95cSAndy Grover pdu_length = (cmd->se_cmd.data_length - 1193e48354ceSNicholas Bellinger cmd->write_data_done); 1194e48354ceSNicholas Bellinger else 1195e48354ceSNicholas Bellinger pdu_length = (conn->sess->sess_ops->MaxBurstLength - 1196e48354ceSNicholas Bellinger cmd->next_burst_len); 1197e48354ceSNicholas Bellinger } else { 1198e48354ceSNicholas Bellinger pdu_offset = cmd->seq_start_offset; 1199e48354ceSNicholas Bellinger pdu_length = (cmd->seq_end_offset - 1200e48354ceSNicholas Bellinger cmd->seq_start_offset); 1201e48354ceSNicholas Bellinger } 1202e48354ceSNicholas Bellinger } else { 1203e48354ceSNicholas Bellinger if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, 1204e48354ceSNicholas Bellinger &pdu_length) < 0) 1205e48354ceSNicholas Bellinger goto failure; 1206e48354ceSNicholas Bellinger } 1207e48354ceSNicholas Bellinger 1208e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 1209e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 1210e48354ceSNicholas Bellinger goto failure; 1211e48354ceSNicholas Bellinger 1212e48354ceSNicholas Bellinger pr_debug("Command ITT: 0x%08x timed out waiting for" 1213e48354ceSNicholas Bellinger " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", 1214e48354ceSNicholas Bellinger cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : 1215e48354ceSNicholas Bellinger "", r2t_offset, r2t_length); 1216e48354ceSNicholas Bellinger 1217e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) 1218e48354ceSNicholas Bellinger goto failure; 1219e48354ceSNicholas Bellinger 1220e48354ceSNicholas Bellinger iscsit_start_dataout_timer(cmd, conn); 1221e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1222e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1223e48354ceSNicholas Bellinger 1224e48354ceSNicholas Bellinger return; 1225e48354ceSNicholas Bellinger 1226e48354ceSNicholas Bellinger failure: 1227e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1228e48354ceSNicholas Bellinger iscsit_cause_connection_reinstatement(conn, 0); 1229e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1230e48354ceSNicholas Bellinger } 1231e48354ceSNicholas Bellinger 1232e48354ceSNicholas Bellinger void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) 1233e48354ceSNicholas Bellinger { 1234e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1235e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1236e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1237e48354ceSNicholas Bellinger 1238e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1239e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1240e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1241e48354ceSNicholas Bellinger return; 1242e48354ceSNicholas Bellinger } 1243e48354ceSNicholas Bellinger 1244e48354ceSNicholas Bellinger mod_timer(&cmd->dataout_timer, 1245e48354ceSNicholas Bellinger (get_jiffies_64() + na->dataout_timeout * HZ)); 1246e48354ceSNicholas Bellinger pr_debug("Updated DataOUT timer for ITT: 0x%08x", 1247e48354ceSNicholas Bellinger cmd->init_task_tag); 1248e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1249e48354ceSNicholas Bellinger } 1250e48354ceSNicholas Bellinger 1251e48354ceSNicholas Bellinger /* 1252e48354ceSNicholas Bellinger * Called with cmd->dataout_timeout_lock held. 1253e48354ceSNicholas Bellinger */ 1254e48354ceSNicholas Bellinger void iscsit_start_dataout_timer( 1255e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1256e48354ceSNicholas Bellinger struct iscsi_conn *conn) 1257e48354ceSNicholas Bellinger { 1258e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1259e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1260e48354ceSNicholas Bellinger 1261e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) 1262e48354ceSNicholas Bellinger return; 1263e48354ceSNicholas Bellinger 1264e48354ceSNicholas Bellinger pr_debug("Starting DataOUT timer for ITT: 0x%08x on" 1265e48354ceSNicholas Bellinger " CID: %hu.\n", cmd->init_task_tag, conn->cid); 1266e48354ceSNicholas Bellinger 1267e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; 1268e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; 12698a47aa9dSBart Van Assche mod_timer(&cmd->dataout_timer, jiffies + na->dataout_timeout * HZ); 1270e48354ceSNicholas Bellinger } 1271e48354ceSNicholas Bellinger 1272e48354ceSNicholas Bellinger void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) 1273e48354ceSNicholas Bellinger { 1274e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1275e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1276e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1277e48354ceSNicholas Bellinger return; 1278e48354ceSNicholas Bellinger } 1279e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_STOP; 1280e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1281e48354ceSNicholas Bellinger 1282e48354ceSNicholas Bellinger del_timer_sync(&cmd->dataout_timer); 1283e48354ceSNicholas Bellinger 1284e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1285e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1286e48354ceSNicholas Bellinger pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", 1287e48354ceSNicholas Bellinger cmd->init_task_tag); 1288e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1289e48354ceSNicholas Bellinger } 12903e1c81a9SNicholas Bellinger EXPORT_SYMBOL(iscsit_stop_dataout_timer); 1291