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 37919765e9SBart Van Assche #define OFFLOAD_BUF_SIZE 32768U 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 59919765e9SBart Van Assche length = min(buf_len, OFFLOAD_BUF_SIZE); 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) { 70919765e9SBart Van Assche size = min(buf_len - offset, length); 71e48354ceSNicholas Bellinger 72e48354ceSNicholas Bellinger iov.iov_len = size; 73e48354ceSNicholas Bellinger iov.iov_base = buf; 74e48354ceSNicholas Bellinger 75e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, size); 76e48354ceSNicholas Bellinger if (rx_got != size) { 77e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 78e48354ceSNicholas Bellinger goto out; 79e48354ceSNicholas Bellinger } 80e48354ceSNicholas Bellinger 81e48354ceSNicholas Bellinger offset += size; 82e48354ceSNicholas Bellinger } 83e48354ceSNicholas Bellinger 84e48354ceSNicholas Bellinger if (!dump_padding_digest) 85e48354ceSNicholas Bellinger goto out; 86e48354ceSNicholas Bellinger 87e48354ceSNicholas Bellinger padding = ((-buf_len) & 3); 88e48354ceSNicholas Bellinger if (padding != 0) { 89e48354ceSNicholas Bellinger iov.iov_len = padding; 90e48354ceSNicholas Bellinger iov.iov_base = pad_bytes; 91e48354ceSNicholas Bellinger 92e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, padding); 93e48354ceSNicholas Bellinger if (rx_got != padding) { 94e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 95e48354ceSNicholas Bellinger goto out; 96e48354ceSNicholas Bellinger } 97e48354ceSNicholas Bellinger } 98e48354ceSNicholas Bellinger 99e48354ceSNicholas Bellinger if (conn->conn_ops->DataDigest) { 100e48354ceSNicholas Bellinger u32 data_crc; 101e48354ceSNicholas Bellinger 102e48354ceSNicholas Bellinger iov.iov_len = ISCSI_CRC_LEN; 103e48354ceSNicholas Bellinger iov.iov_base = &data_crc; 104e48354ceSNicholas Bellinger 105e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 106e48354ceSNicholas Bellinger if (rx_got != ISCSI_CRC_LEN) { 107e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 108e48354ceSNicholas Bellinger goto out; 109e48354ceSNicholas Bellinger } 110e48354ceSNicholas Bellinger } 111e48354ceSNicholas Bellinger 112e48354ceSNicholas Bellinger out: 113e48354ceSNicholas Bellinger kfree(buf); 114e48354ceSNicholas Bellinger return ret; 115e48354ceSNicholas Bellinger } 116e48354ceSNicholas Bellinger 117e48354ceSNicholas Bellinger /* 118e48354ceSNicholas Bellinger * Used for retransmitting R2Ts from a R2T SNACK request. 119e48354ceSNicholas Bellinger */ 120e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t_for_snack( 121e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 122e48354ceSNicholas Bellinger struct iscsi_r2t *r2t) 123e48354ceSNicholas Bellinger { 124e48354ceSNicholas Bellinger /* 125e48354ceSNicholas Bellinger * If the struct iscsi_r2t has not been sent yet, we can safely 126e48354ceSNicholas Bellinger * ignore retransmission 127e48354ceSNicholas Bellinger * of the R2TSN in question. 128e48354ceSNicholas Bellinger */ 129e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 130e48354ceSNicholas Bellinger if (!r2t->sent_r2t) { 131e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 132e48354ceSNicholas Bellinger return 0; 133e48354ceSNicholas Bellinger } 134e48354ceSNicholas Bellinger r2t->sent_r2t = 0; 135e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 136e48354ceSNicholas Bellinger 137e48354ceSNicholas Bellinger iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 138e48354ceSNicholas Bellinger 139e48354ceSNicholas Bellinger return 0; 140e48354ceSNicholas Bellinger } 141e48354ceSNicholas Bellinger 142e48354ceSNicholas Bellinger static int iscsit_handle_r2t_snack( 143e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 144e48354ceSNicholas Bellinger unsigned char *buf, 145e48354ceSNicholas Bellinger u32 begrun, 146e48354ceSNicholas Bellinger u32 runlength) 147e48354ceSNicholas Bellinger { 148e48354ceSNicholas Bellinger u32 last_r2tsn; 149e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 150e48354ceSNicholas Bellinger 151e48354ceSNicholas Bellinger /* 152e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 153e48354ceSNicholas Bellinger * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. 154e48354ceSNicholas Bellinger */ 155e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 156e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 157e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, R2T SNACK requesting" 158e48354ceSNicholas Bellinger " retransmission of R2TSN: 0x%08x to 0x%08x but already" 159e48354ceSNicholas Bellinger " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," 160e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 161e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 162e48354ceSNicholas Bellinger 1635a342521SBart Van Assche return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 164e48354ceSNicholas Bellinger } 165e48354ceSNicholas Bellinger 166e48354ceSNicholas Bellinger if (runlength) { 167e48354ceSNicholas Bellinger if ((begrun + runlength) > cmd->r2t_sn) { 168e48354ceSNicholas Bellinger pr_err("Command ITT: 0x%08x received R2T SNACK" 169e48354ceSNicholas Bellinger " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" 170e48354ceSNicholas Bellinger " current R2TSN: 0x%08x, protocol error.\n", 171e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); 172ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, 173ba159914SNicholas Bellinger ISCSI_REASON_BOOKMARK_INVALID, buf); 174e48354ceSNicholas Bellinger } 175e48354ceSNicholas Bellinger last_r2tsn = (begrun + runlength); 176e48354ceSNicholas Bellinger } else 177e48354ceSNicholas Bellinger last_r2tsn = cmd->r2t_sn; 178e48354ceSNicholas Bellinger 179e48354ceSNicholas Bellinger while (begrun < last_r2tsn) { 180e48354ceSNicholas Bellinger r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); 181e48354ceSNicholas Bellinger if (!r2t) 182e48354ceSNicholas Bellinger return -1; 183e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) 184e48354ceSNicholas Bellinger return -1; 185e48354ceSNicholas Bellinger 186e48354ceSNicholas Bellinger begrun++; 187e48354ceSNicholas Bellinger } 188e48354ceSNicholas Bellinger 189e48354ceSNicholas Bellinger return 0; 190e48354ceSNicholas Bellinger } 191e48354ceSNicholas Bellinger 192e48354ceSNicholas Bellinger /* 193e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 194e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 195e48354ceSNicholas Bellinger * 196e48354ceSNicholas Bellinger * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. 197e48354ceSNicholas Bellinger * 198e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 199e48354ceSNicholas Bellinger */ 200e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_yes( 201e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 202e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 203e48354ceSNicholas Bellinger { 204e48354ceSNicholas Bellinger u32 data_sn = 0, data_sn_count = 0; 205e48354ceSNicholas Bellinger u32 pdu_start = 0, seq_no = 0; 206e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 207e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 208e48354ceSNicholas Bellinger 209e48354ceSNicholas Bellinger while (begrun > data_sn++) { 210e48354ceSNicholas Bellinger data_sn_count++; 211e48354ceSNicholas Bellinger if ((dr->next_burst_len + 212e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength) < 213e48354ceSNicholas Bellinger conn->sess->sess_ops->MaxBurstLength) { 214e48354ceSNicholas Bellinger dr->read_data_done += 215e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 216e48354ceSNicholas Bellinger dr->next_burst_len += 217e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 218e48354ceSNicholas Bellinger } else { 219e48354ceSNicholas Bellinger dr->read_data_done += 220e48354ceSNicholas Bellinger (conn->sess->sess_ops->MaxBurstLength - 221e48354ceSNicholas Bellinger dr->next_burst_len); 222e48354ceSNicholas Bellinger dr->next_burst_len = 0; 223e48354ceSNicholas Bellinger pdu_start += data_sn_count; 224e48354ceSNicholas Bellinger data_sn_count = 0; 225e48354ceSNicholas Bellinger seq_no++; 226e48354ceSNicholas Bellinger } 227e48354ceSNicholas Bellinger } 228e48354ceSNicholas Bellinger 229e48354ceSNicholas Bellinger if (!conn->sess->sess_ops->DataPDUInOrder) { 230e48354ceSNicholas Bellinger cmd->seq_no = seq_no; 231e48354ceSNicholas Bellinger cmd->pdu_start = pdu_start; 232e48354ceSNicholas Bellinger cmd->pdu_send_order = data_sn_count; 233e48354ceSNicholas Bellinger } 234e48354ceSNicholas Bellinger 235e48354ceSNicholas Bellinger return 0; 236e48354ceSNicholas Bellinger } 237e48354ceSNicholas Bellinger 238e48354ceSNicholas Bellinger /* 239e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 240e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 241e48354ceSNicholas Bellinger * 242e48354ceSNicholas Bellinger * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. 243e48354ceSNicholas Bellinger * 244e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 245e48354ceSNicholas Bellinger */ 246e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_no( 247e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 248e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 249e48354ceSNicholas Bellinger { 250e48354ceSNicholas Bellinger int found_seq = 0, i; 251e48354ceSNicholas Bellinger u32 data_sn, read_data_done = 0, seq_send_order = 0; 252e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 253e48354ceSNicholas Bellinger u32 runlength = dr->runlength; 254e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 255e48354ceSNicholas Bellinger struct iscsi_seq *first_seq = NULL, *seq = NULL; 256e48354ceSNicholas Bellinger 257e48354ceSNicholas Bellinger if (!cmd->seq_list) { 258e48354ceSNicholas Bellinger pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 259e48354ceSNicholas Bellinger return -1; 260e48354ceSNicholas Bellinger } 261e48354ceSNicholas Bellinger 262e48354ceSNicholas Bellinger /* 263e48354ceSNicholas Bellinger * Calculate read_data_done for all sequences containing a 264e48354ceSNicholas Bellinger * first_datasn and last_datasn less than the BegRun. 265e48354ceSNicholas Bellinger * 266e48354ceSNicholas Bellinger * Locate the struct iscsi_seq the BegRun lies within and calculate 267e48354ceSNicholas Bellinger * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. 268e48354ceSNicholas Bellinger * 269e48354ceSNicholas Bellinger * Also use struct iscsi_seq->seq_send_order to determine where to start. 270e48354ceSNicholas Bellinger */ 271e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 272e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 273e48354ceSNicholas Bellinger 274e48354ceSNicholas Bellinger if (!seq->seq_send_order) 275e48354ceSNicholas Bellinger first_seq = seq; 276e48354ceSNicholas Bellinger 277e48354ceSNicholas Bellinger /* 278e48354ceSNicholas Bellinger * No data has been transferred for this DataIN sequence, so the 279e48354ceSNicholas Bellinger * seq->first_datasn and seq->last_datasn have not been set. 280e48354ceSNicholas Bellinger */ 281e48354ceSNicholas Bellinger if (!seq->sent) { 282e48354ceSNicholas Bellinger pr_err("Ignoring non-sent sequence 0x%08x ->" 283e48354ceSNicholas Bellinger " 0x%08x\n\n", seq->first_datasn, 284e48354ceSNicholas Bellinger seq->last_datasn); 285e48354ceSNicholas Bellinger continue; 286e48354ceSNicholas Bellinger } 287e48354ceSNicholas Bellinger 288e48354ceSNicholas Bellinger /* 289e48354ceSNicholas Bellinger * This DataIN sequence is precedes the received BegRun, add the 290e48354ceSNicholas Bellinger * total xfer_len of the sequence to read_data_done and reset 291e48354ceSNicholas Bellinger * seq->pdu_send_order. 292e48354ceSNicholas Bellinger */ 293e48354ceSNicholas Bellinger if ((seq->first_datasn < begrun) && 294e48354ceSNicholas Bellinger (seq->last_datasn < begrun)) { 295e48354ceSNicholas Bellinger pr_err("Pre BegRun sequence 0x%08x ->" 296e48354ceSNicholas Bellinger " 0x%08x\n", seq->first_datasn, 297e48354ceSNicholas Bellinger seq->last_datasn); 2988b1e1244SAndy Grover 299e48354ceSNicholas Bellinger read_data_done += cmd->seq_list[i].xfer_len; 300e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 301e48354ceSNicholas Bellinger continue; 302e48354ceSNicholas Bellinger } 303e48354ceSNicholas Bellinger 304e48354ceSNicholas Bellinger /* 305e48354ceSNicholas Bellinger * The BegRun lies within this DataIN sequence. 306e48354ceSNicholas Bellinger */ 307e48354ceSNicholas Bellinger if ((seq->first_datasn <= begrun) && 308e48354ceSNicholas Bellinger (seq->last_datasn >= begrun)) { 309e48354ceSNicholas Bellinger pr_err("Found sequence begrun: 0x%08x in" 310e48354ceSNicholas Bellinger " 0x%08x -> 0x%08x\n", begrun, 311e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 3128b1e1244SAndy Grover 313e48354ceSNicholas Bellinger seq_send_order = seq->seq_send_order; 314e48354ceSNicholas Bellinger data_sn = seq->first_datasn; 315e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 316e48354ceSNicholas Bellinger found_seq = 1; 317e48354ceSNicholas Bellinger 318e48354ceSNicholas Bellinger /* 319e48354ceSNicholas Bellinger * For DataPDUInOrder=Yes, while the first DataSN of 320e48354ceSNicholas Bellinger * the sequence is less than the received BegRun, add 321e48354ceSNicholas Bellinger * the MaxRecvDataSegmentLength to read_data_done and 322e48354ceSNicholas Bellinger * to the sequence's next_burst_len; 323e48354ceSNicholas Bellinger * 324e48354ceSNicholas Bellinger * For DataPDUInOrder=No, while the first DataSN of the 325e48354ceSNicholas Bellinger * sequence is less than the received BegRun, find the 326e48354ceSNicholas Bellinger * struct iscsi_pdu of the DataSN in question and add the 327e48354ceSNicholas Bellinger * MaxRecvDataSegmentLength to read_data_done and to the 328e48354ceSNicholas Bellinger * sequence's next_burst_len; 329e48354ceSNicholas Bellinger */ 330e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 331e48354ceSNicholas Bellinger while (data_sn < begrun) { 332e48354ceSNicholas Bellinger seq->pdu_send_order++; 333e48354ceSNicholas Bellinger read_data_done += 334e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 335e48354ceSNicholas Bellinger seq->next_burst_len += 336e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 337e48354ceSNicholas Bellinger data_sn++; 338e48354ceSNicholas Bellinger } 339e48354ceSNicholas Bellinger } else { 340e48354ceSNicholas Bellinger int j; 341e48354ceSNicholas Bellinger struct iscsi_pdu *pdu; 342e48354ceSNicholas Bellinger 343e48354ceSNicholas Bellinger while (data_sn < begrun) { 344e48354ceSNicholas Bellinger seq->pdu_send_order++; 345e48354ceSNicholas Bellinger 346e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 347e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[ 348e48354ceSNicholas Bellinger seq->pdu_start + j]; 349e48354ceSNicholas Bellinger if (pdu->data_sn == data_sn) { 350e48354ceSNicholas Bellinger read_data_done += 351e48354ceSNicholas Bellinger pdu->length; 352e48354ceSNicholas Bellinger seq->next_burst_len += 353e48354ceSNicholas Bellinger pdu->length; 354e48354ceSNicholas Bellinger } 355e48354ceSNicholas Bellinger } 356e48354ceSNicholas Bellinger data_sn++; 357e48354ceSNicholas Bellinger } 358e48354ceSNicholas Bellinger } 359e48354ceSNicholas Bellinger continue; 360e48354ceSNicholas Bellinger } 361e48354ceSNicholas Bellinger 362e48354ceSNicholas Bellinger /* 363e48354ceSNicholas Bellinger * This DataIN sequence is larger than the received BegRun, 364e48354ceSNicholas Bellinger * reset seq->pdu_send_order and continue. 365e48354ceSNicholas Bellinger */ 366e48354ceSNicholas Bellinger if ((seq->first_datasn > begrun) || 367e48354ceSNicholas Bellinger (seq->last_datasn > begrun)) { 368e48354ceSNicholas Bellinger pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", 369e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 3708b1e1244SAndy Grover 371e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 372e48354ceSNicholas Bellinger continue; 373e48354ceSNicholas Bellinger } 374e48354ceSNicholas Bellinger } 375e48354ceSNicholas Bellinger 376e48354ceSNicholas Bellinger if (!found_seq) { 377e48354ceSNicholas Bellinger if (!begrun) { 378e48354ceSNicholas Bellinger if (!first_seq) { 379e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Begrun: 0x%08x" 380e48354ceSNicholas Bellinger " but first_seq is NULL\n", 381e48354ceSNicholas Bellinger cmd->init_task_tag, begrun); 382e48354ceSNicholas Bellinger return -1; 383e48354ceSNicholas Bellinger } 384e48354ceSNicholas Bellinger seq_send_order = first_seq->seq_send_order; 385e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 386e48354ceSNicholas Bellinger goto done; 387e48354ceSNicholas Bellinger } 388e48354ceSNicholas Bellinger 389e48354ceSNicholas Bellinger pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," 390e48354ceSNicholas Bellinger " BegRun: 0x%08x, RunLength: 0x%08x while" 391e48354ceSNicholas Bellinger " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", 392e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, 393e48354ceSNicholas Bellinger (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); 394e48354ceSNicholas Bellinger return -1; 395e48354ceSNicholas Bellinger } 396e48354ceSNicholas Bellinger 397e48354ceSNicholas Bellinger done: 398e48354ceSNicholas Bellinger dr->read_data_done = read_data_done; 399e48354ceSNicholas Bellinger dr->seq_send_order = seq_send_order; 400e48354ceSNicholas Bellinger 401e48354ceSNicholas Bellinger return 0; 402e48354ceSNicholas Bellinger } 403e48354ceSNicholas Bellinger 404e48354ceSNicholas Bellinger static int iscsit_handle_recovery_datain( 405e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 406e48354ceSNicholas Bellinger unsigned char *buf, 407e48354ceSNicholas Bellinger u32 begrun, 408e48354ceSNicholas Bellinger u32 runlength) 409e48354ceSNicholas Bellinger { 410e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 411e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 412e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 413e48354ceSNicholas Bellinger 4147d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 415e48354ceSNicholas Bellinger pr_err("Ignoring ITT: 0x%08x Data SNACK\n", 416e48354ceSNicholas Bellinger cmd->init_task_tag); 417e48354ceSNicholas Bellinger return 0; 418e48354ceSNicholas Bellinger } 419e48354ceSNicholas Bellinger 420e48354ceSNicholas Bellinger /* 421e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 422e48354ceSNicholas Bellinger * of DataSNs already acknowledged by a Data ACK SNACK. 423e48354ceSNicholas Bellinger */ 424e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 425e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 426e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Data SNACK requesting" 427e48354ceSNicholas Bellinger " retransmission of DataSN: 0x%08x to 0x%08x but" 428e48354ceSNicholas Bellinger " already acked to DataSN: 0x%08x by Data ACK SNACK," 429e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 430e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 431e48354ceSNicholas Bellinger 432ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 433e48354ceSNicholas Bellinger } 434e48354ceSNicholas Bellinger 435e48354ceSNicholas Bellinger /* 436e48354ceSNicholas Bellinger * Make sure BegRun and RunLength in the Data SNACK are sane. 437e48354ceSNicholas Bellinger * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. 438e48354ceSNicholas Bellinger */ 439e48354ceSNicholas Bellinger if ((begrun + runlength) > (cmd->data_sn - 1)) { 440e48354ceSNicholas Bellinger pr_err("Initiator requesting BegRun: 0x%08x, RunLength" 441e48354ceSNicholas Bellinger ": 0x%08x greater than maximum DataSN: 0x%08x.\n", 442e48354ceSNicholas Bellinger begrun, runlength, (cmd->data_sn - 1)); 443ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, 444ba159914SNicholas Bellinger buf); 445e48354ceSNicholas Bellinger } 446e48354ceSNicholas Bellinger 447e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 448e48354ceSNicholas Bellinger if (!dr) 449ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 450ba159914SNicholas Bellinger buf); 451e48354ceSNicholas Bellinger 452e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = begrun; 453e48354ceSNicholas Bellinger dr->runlength = runlength; 454e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 455e48354ceSNicholas Bellinger dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; 456e48354ceSNicholas Bellinger 457e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 458e48354ceSNicholas Bellinger 459e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 460e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 461e48354ceSNicholas Bellinger 462e48354ceSNicholas Bellinger return 0; 463e48354ceSNicholas Bellinger } 464e48354ceSNicholas Bellinger 465e48354ceSNicholas Bellinger int iscsit_handle_recovery_datain_or_r2t( 466e48354ceSNicholas Bellinger struct iscsi_conn *conn, 467e48354ceSNicholas Bellinger unsigned char *buf, 46866c7db68SChristoph Hellwig itt_t init_task_tag, 469e48354ceSNicholas Bellinger u32 targ_xfer_tag, 470e48354ceSNicholas Bellinger u32 begrun, 471e48354ceSNicholas Bellinger u32 runlength) 472e48354ceSNicholas Bellinger { 473e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 474e48354ceSNicholas Bellinger 475e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); 476e48354ceSNicholas Bellinger if (!cmd) 477e48354ceSNicholas Bellinger return 0; 478e48354ceSNicholas Bellinger 479e48354ceSNicholas Bellinger /* 480e48354ceSNicholas Bellinger * FIXME: This will not work for bidi commands. 481e48354ceSNicholas Bellinger */ 482e48354ceSNicholas Bellinger switch (cmd->data_direction) { 483e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 484e48354ceSNicholas Bellinger return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); 485e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 486e48354ceSNicholas Bellinger return iscsit_handle_recovery_datain(cmd, buf, begrun, 487e48354ceSNicholas Bellinger runlength); 488e48354ceSNicholas Bellinger default: 489e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 490e48354ceSNicholas Bellinger cmd->data_direction); 491e48354ceSNicholas Bellinger return -1; 492e48354ceSNicholas Bellinger } 493e48354ceSNicholas Bellinger 494e48354ceSNicholas Bellinger return 0; 495e48354ceSNicholas Bellinger } 496e48354ceSNicholas Bellinger 497e48354ceSNicholas Bellinger /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ 498e48354ceSNicholas Bellinger int iscsit_handle_status_snack( 499e48354ceSNicholas Bellinger struct iscsi_conn *conn, 50066c7db68SChristoph Hellwig itt_t init_task_tag, 501e48354ceSNicholas Bellinger u32 targ_xfer_tag, 502e48354ceSNicholas Bellinger u32 begrun, 503e48354ceSNicholas Bellinger u32 runlength) 504e48354ceSNicholas Bellinger { 505e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 506e48354ceSNicholas Bellinger u32 last_statsn; 507e48354ceSNicholas Bellinger int found_cmd; 508e48354ceSNicholas Bellinger 509752d8680SNicholas Bellinger if (!begrun) { 510752d8680SNicholas Bellinger begrun = conn->exp_statsn; 511752d8680SNicholas Bellinger } else if (conn->exp_statsn > begrun) { 512e48354ceSNicholas Bellinger pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" 513e48354ceSNicholas Bellinger " 0x%08x but already got ExpStatSN: 0x%08x on CID:" 514e48354ceSNicholas Bellinger " %hu.\n", begrun, runlength, conn->exp_statsn, 515e48354ceSNicholas Bellinger conn->cid); 516e48354ceSNicholas Bellinger return 0; 517e48354ceSNicholas Bellinger } 518e48354ceSNicholas Bellinger 519e48354ceSNicholas Bellinger last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); 520e48354ceSNicholas Bellinger 521e48354ceSNicholas Bellinger while (begrun < last_statsn) { 522e48354ceSNicholas Bellinger found_cmd = 0; 523e48354ceSNicholas Bellinger 524e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 5252fbb471eSAndy Grover list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 526e48354ceSNicholas Bellinger if (cmd->stat_sn == begrun) { 527e48354ceSNicholas Bellinger found_cmd = 1; 528e48354ceSNicholas Bellinger break; 529e48354ceSNicholas Bellinger } 530e48354ceSNicholas Bellinger } 531e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 532e48354ceSNicholas Bellinger 533e48354ceSNicholas Bellinger if (!found_cmd) { 534e48354ceSNicholas Bellinger pr_err("Unable to find StatSN: 0x%08x for" 535e48354ceSNicholas Bellinger " a Status SNACK, assuming this was a" 536e48354ceSNicholas Bellinger " protactic SNACK for an untransmitted" 537e48354ceSNicholas Bellinger " StatSN, ignoring.\n", begrun); 538e48354ceSNicholas Bellinger begrun++; 539e48354ceSNicholas Bellinger continue; 540e48354ceSNicholas Bellinger } 541e48354ceSNicholas Bellinger 542e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 543e48354ceSNicholas Bellinger if (cmd->i_state == ISTATE_SEND_DATAIN) { 544e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 545e48354ceSNicholas Bellinger pr_err("Ignoring Status SNACK for BegRun:" 546e48354ceSNicholas Bellinger " 0x%08x, RunLength: 0x%08x, assuming this was" 547e48354ceSNicholas Bellinger " a protactic SNACK for an untransmitted" 548e48354ceSNicholas Bellinger " StatSN\n", begrun, runlength); 549e48354ceSNicholas Bellinger begrun++; 550e48354ceSNicholas Bellinger continue; 551e48354ceSNicholas Bellinger } 552e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 553e48354ceSNicholas Bellinger 554e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; 555e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 556e48354ceSNicholas Bellinger begrun++; 557e48354ceSNicholas Bellinger } 558e48354ceSNicholas Bellinger 559e48354ceSNicholas Bellinger return 0; 560e48354ceSNicholas Bellinger } 561e48354ceSNicholas Bellinger 562e48354ceSNicholas Bellinger int iscsit_handle_data_ack( 563e48354ceSNicholas Bellinger struct iscsi_conn *conn, 564e48354ceSNicholas Bellinger u32 targ_xfer_tag, 565e48354ceSNicholas Bellinger u32 begrun, 566e48354ceSNicholas Bellinger u32 runlength) 567e48354ceSNicholas Bellinger { 568e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 569e48354ceSNicholas Bellinger 570e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); 571e48354ceSNicholas Bellinger if (!cmd) { 572e48354ceSNicholas Bellinger pr_err("Data ACK SNACK for TTT: 0x%08x is" 573e48354ceSNicholas Bellinger " invalid.\n", targ_xfer_tag); 574e48354ceSNicholas Bellinger return -1; 575e48354ceSNicholas Bellinger } 576e48354ceSNicholas Bellinger 577e48354ceSNicholas Bellinger if (begrun <= cmd->acked_data_sn) { 578e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" 579e48354ceSNicholas Bellinger " less than the already acked DataSN: 0x%08x.\n", 580e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, cmd->acked_data_sn); 581e48354ceSNicholas Bellinger return -1; 582e48354ceSNicholas Bellinger } 583e48354ceSNicholas Bellinger 584e48354ceSNicholas Bellinger /* 585e48354ceSNicholas Bellinger * For Data ACK SNACK, BegRun is the next expected DataSN. 586e48354ceSNicholas Bellinger * (see iSCSI v19: 10.16.6) 587e48354ceSNicholas Bellinger */ 588e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 589e48354ceSNicholas Bellinger cmd->acked_data_sn = (begrun - 1); 590e48354ceSNicholas Bellinger 591e48354ceSNicholas Bellinger pr_debug("Received Data ACK SNACK for ITT: 0x%08x," 592e48354ceSNicholas Bellinger " updated acked DataSN to 0x%08x.\n", 593e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->acked_data_sn); 594e48354ceSNicholas Bellinger 595e48354ceSNicholas Bellinger return 0; 596e48354ceSNicholas Bellinger } 597e48354ceSNicholas Bellinger 598e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t( 599e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 600e48354ceSNicholas Bellinger u32 offset, 601e48354ceSNicholas Bellinger u32 xfer_len) 602e48354ceSNicholas Bellinger { 603e48354ceSNicholas Bellinger int ret; 604e48354ceSNicholas Bellinger 605e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 606e48354ceSNicholas Bellinger ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); 607e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 608e48354ceSNicholas Bellinger 609e48354ceSNicholas Bellinger return ret; 610e48354ceSNicholas Bellinger } 611e48354ceSNicholas Bellinger 612e48354ceSNicholas Bellinger int iscsit_dataout_datapduinorder_no_fbit( 613e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 614e48354ceSNicholas Bellinger struct iscsi_pdu *pdu) 615e48354ceSNicholas Bellinger { 616e48354ceSNicholas Bellinger int i, send_recovery_r2t = 0, recovery = 0; 617e48354ceSNicholas Bellinger u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; 618e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 619e48354ceSNicholas Bellinger struct iscsi_pdu *first_pdu = NULL; 620e48354ceSNicholas Bellinger 621e48354ceSNicholas Bellinger /* 622e48354ceSNicholas Bellinger * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count 623e48354ceSNicholas Bellinger * of the DataOUT sequence. 624e48354ceSNicholas Bellinger */ 625e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 626e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 627e48354ceSNicholas Bellinger if (cmd->pdu_list[i].seq_no == pdu->seq_no) { 628e48354ceSNicholas Bellinger if (!first_pdu) 629e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[i]; 630e48354ceSNicholas Bellinger xfer_len += cmd->pdu_list[i].length; 631e48354ceSNicholas Bellinger pdu_count++; 632e48354ceSNicholas Bellinger } else if (pdu_count) 633e48354ceSNicholas Bellinger break; 634e48354ceSNicholas Bellinger } 635e48354ceSNicholas Bellinger } else { 636e48354ceSNicholas Bellinger struct iscsi_seq *seq = cmd->seq_ptr; 637e48354ceSNicholas Bellinger 638e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[seq->pdu_start]; 639e48354ceSNicholas Bellinger pdu_count = seq->pdu_count; 640e48354ceSNicholas Bellinger } 641e48354ceSNicholas Bellinger 642e48354ceSNicholas Bellinger if (!first_pdu || !pdu_count) 643e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 644e48354ceSNicholas Bellinger 645e48354ceSNicholas Bellinger /* 646e48354ceSNicholas Bellinger * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. 647e48354ceSNicholas Bellinger * The following ugly logic does batching of not received PDUs. 648e48354ceSNicholas Bellinger */ 649e48354ceSNicholas Bellinger for (i = 0; i < pdu_count; i++) { 650e48354ceSNicholas Bellinger if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { 651e48354ceSNicholas Bellinger if (!send_recovery_r2t) 652e48354ceSNicholas Bellinger continue; 653e48354ceSNicholas Bellinger 654e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 655e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 656e48354ceSNicholas Bellinger 657e48354ceSNicholas Bellinger send_recovery_r2t = length = offset = 0; 658e48354ceSNicholas Bellinger continue; 659e48354ceSNicholas Bellinger } 660e48354ceSNicholas Bellinger /* 661e48354ceSNicholas Bellinger * Set recovery = 1 for any missing, CRC failed, or timed 662e48354ceSNicholas Bellinger * out PDUs to let the DataOUT logic know that this sequence 663e48354ceSNicholas Bellinger * has not been completed yet. 664e48354ceSNicholas Bellinger * 665e48354ceSNicholas Bellinger * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. 666e48354ceSNicholas Bellinger * We assume if the PDU either failed CRC or timed out 667e48354ceSNicholas Bellinger * that a Recovery R2T has already been sent. 668e48354ceSNicholas Bellinger */ 669e48354ceSNicholas Bellinger recovery = 1; 670e48354ceSNicholas Bellinger 671e48354ceSNicholas Bellinger if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) 672e48354ceSNicholas Bellinger continue; 673e48354ceSNicholas Bellinger 674e48354ceSNicholas Bellinger if (!offset) 675e48354ceSNicholas Bellinger offset = first_pdu[i].offset; 676e48354ceSNicholas Bellinger length += first_pdu[i].length; 677e48354ceSNicholas Bellinger 678e48354ceSNicholas Bellinger send_recovery_r2t = 1; 679e48354ceSNicholas Bellinger } 680e48354ceSNicholas Bellinger 681e48354ceSNicholas Bellinger if (send_recovery_r2t) 682e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 683e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 684e48354ceSNicholas Bellinger 685e48354ceSNicholas Bellinger return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; 686e48354ceSNicholas Bellinger } 687e48354ceSNicholas Bellinger 688e48354ceSNicholas Bellinger static int iscsit_recalculate_dataout_values( 689e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 690e48354ceSNicholas Bellinger u32 pdu_offset, 691e48354ceSNicholas Bellinger u32 pdu_length, 692e48354ceSNicholas Bellinger u32 *r2t_offset, 693e48354ceSNicholas Bellinger u32 *r2t_length) 694e48354ceSNicholas Bellinger { 695e48354ceSNicholas Bellinger int i; 696e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 697e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 698e48354ceSNicholas Bellinger 699e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 700e48354ceSNicholas Bellinger cmd->data_sn = 0; 701e48354ceSNicholas Bellinger 702e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 703e48354ceSNicholas Bellinger *r2t_offset = cmd->write_data_done; 704e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - 705e48354ceSNicholas Bellinger cmd->write_data_done); 706e48354ceSNicholas Bellinger return 0; 707e48354ceSNicholas Bellinger } 708e48354ceSNicholas Bellinger 709e48354ceSNicholas Bellinger *r2t_offset = cmd->seq_start_offset; 710e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); 711e48354ceSNicholas Bellinger 712e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 713e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 714e48354ceSNicholas Bellinger 715e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 716e48354ceSNicholas Bellinger continue; 717e48354ceSNicholas Bellinger 718e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 719e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 720e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 721e48354ceSNicholas Bellinger if (!cmd->unsolicited_data) 722e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 723e48354ceSNicholas Bellinger else 724e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 725e48354ceSNicholas Bellinger 726e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 727e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 728e48354ceSNicholas Bellinger } 729e48354ceSNicholas Bellinger } 730e48354ceSNicholas Bellinger } else { 731e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 732e48354ceSNicholas Bellinger 733e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); 734e48354ceSNicholas Bellinger if (!seq) 735e48354ceSNicholas Bellinger return -1; 736e48354ceSNicholas Bellinger 737e48354ceSNicholas Bellinger *r2t_offset = seq->orig_offset; 738e48354ceSNicholas Bellinger *r2t_length = seq->xfer_len; 739e48354ceSNicholas Bellinger 740e48354ceSNicholas Bellinger cmd->write_data_done -= (seq->offset - seq->orig_offset); 741e48354ceSNicholas Bellinger if (cmd->immediate_data) 742e48354ceSNicholas Bellinger cmd->first_burst_len = cmd->write_data_done; 743e48354ceSNicholas Bellinger 744e48354ceSNicholas Bellinger seq->data_sn = 0; 745e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 746e48354ceSNicholas Bellinger seq->next_burst_len = 0; 747e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 748e48354ceSNicholas Bellinger 749e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 750e48354ceSNicholas Bellinger return 0; 751e48354ceSNicholas Bellinger 752e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 753e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 754e48354ceSNicholas Bellinger 755e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 756e48354ceSNicholas Bellinger continue; 757e48354ceSNicholas Bellinger 758e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 759e48354ceSNicholas Bellinger } 760e48354ceSNicholas Bellinger } 761e48354ceSNicholas Bellinger 762e48354ceSNicholas Bellinger return 0; 763e48354ceSNicholas Bellinger } 764e48354ceSNicholas Bellinger 765e48354ceSNicholas Bellinger int iscsit_recover_dataout_sequence( 766e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 767e48354ceSNicholas Bellinger u32 pdu_offset, 768e48354ceSNicholas Bellinger u32 pdu_length) 769e48354ceSNicholas Bellinger { 770e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 771e48354ceSNicholas Bellinger 772e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 773e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 774e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 775e48354ceSNicholas Bellinger 776e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 777e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 778e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 779e48354ceSNicholas Bellinger 780e48354ceSNicholas Bellinger iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); 781e48354ceSNicholas Bellinger 782e48354ceSNicholas Bellinger return DATAOUT_WITHIN_COMMAND_RECOVERY; 783e48354ceSNicholas Bellinger } 784e48354ceSNicholas Bellinger 785e48354ceSNicholas Bellinger static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) 786e48354ceSNicholas Bellinger { 787e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; 788e48354ceSNicholas Bellinger 789e48354ceSNicholas Bellinger ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); 790e48354ceSNicholas Bellinger if (!ooo_cmdsn) { 791e48354ceSNicholas Bellinger pr_err("Unable to allocate memory for" 792e48354ceSNicholas Bellinger " struct iscsi_ooo_cmdsn.\n"); 793e48354ceSNicholas Bellinger return NULL; 794e48354ceSNicholas Bellinger } 795e48354ceSNicholas Bellinger INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); 796e48354ceSNicholas Bellinger 797e48354ceSNicholas Bellinger return ooo_cmdsn; 798e48354ceSNicholas Bellinger } 799e48354ceSNicholas Bellinger 800e48354ceSNicholas Bellinger static int iscsit_attach_ooo_cmdsn( 801e48354ceSNicholas Bellinger struct iscsi_session *sess, 802e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 803e48354ceSNicholas Bellinger { 804e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; 805618baaf7SBart Van Assche 806618baaf7SBart Van Assche lockdep_assert_held(&sess->cmdsn_mutex); 807618baaf7SBart Van Assche 808e48354ceSNicholas Bellinger /* 809e48354ceSNicholas Bellinger * We attach the struct iscsi_ooo_cmdsn entry to the out of order 810e48354ceSNicholas Bellinger * list in increasing CmdSN order. 811e48354ceSNicholas Bellinger * This allows iscsi_execute_ooo_cmdsns() to detect any 812e48354ceSNicholas Bellinger * additional CmdSN holes while performing delayed execution. 813e48354ceSNicholas Bellinger */ 814e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 815e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 816e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 817e48354ceSNicholas Bellinger else { 818e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 819e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 820e48354ceSNicholas Bellinger /* 821e48354ceSNicholas Bellinger * CmdSN is greater than the tail of the list. 822e48354ceSNicholas Bellinger */ 8233eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) 824e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 825e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 826e48354ceSNicholas Bellinger else { 827e48354ceSNicholas Bellinger /* 828e48354ceSNicholas Bellinger * CmdSN is either lower than the head, or somewhere 829e48354ceSNicholas Bellinger * in the middle. 830e48354ceSNicholas Bellinger */ 831e48354ceSNicholas Bellinger list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, 832e48354ceSNicholas Bellinger ooo_list) { 8333eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) 834e48354ceSNicholas Bellinger continue; 835e48354ceSNicholas Bellinger 8363eccfdb0SShlomo Pongratz /* Insert before this entry */ 837e48354ceSNicholas Bellinger list_add(&ooo_cmdsn->ooo_list, 8383eccfdb0SShlomo Pongratz ooo_tmp->ooo_list.prev); 839e48354ceSNicholas Bellinger break; 840e48354ceSNicholas Bellinger } 841e48354ceSNicholas Bellinger } 842e48354ceSNicholas Bellinger } 843e48354ceSNicholas Bellinger 844e48354ceSNicholas Bellinger return 0; 845e48354ceSNicholas Bellinger } 846e48354ceSNicholas Bellinger 847e48354ceSNicholas Bellinger /* 848e48354ceSNicholas Bellinger * Removes an struct iscsi_ooo_cmdsn from a session's list, 849e48354ceSNicholas Bellinger * called with struct iscsi_session->cmdsn_mutex held. 850e48354ceSNicholas Bellinger */ 851e48354ceSNicholas Bellinger void iscsit_remove_ooo_cmdsn( 852e48354ceSNicholas Bellinger struct iscsi_session *sess, 853e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 854e48354ceSNicholas Bellinger { 855e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 856e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 857e48354ceSNicholas Bellinger } 858e48354ceSNicholas Bellinger 859e48354ceSNicholas Bellinger void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) 860e48354ceSNicholas Bellinger { 861e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn; 862e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 863e48354ceSNicholas Bellinger 864e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 865e48354ceSNicholas Bellinger list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { 866e48354ceSNicholas Bellinger if (ooo_cmdsn->cid != conn->cid) 867e48354ceSNicholas Bellinger continue; 868e48354ceSNicholas Bellinger 869e48354ceSNicholas Bellinger ooo_cmdsn->cmd = NULL; 870e48354ceSNicholas Bellinger } 871e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 872e48354ceSNicholas Bellinger } 873e48354ceSNicholas Bellinger 874e48354ceSNicholas Bellinger int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) 875e48354ceSNicholas Bellinger { 876e48354ceSNicholas Bellinger int ooo_count = 0; 877e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 878e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 879e48354ceSNicholas Bellinger 880618baaf7SBart Van Assche lockdep_assert_held(&sess->cmdsn_mutex); 881618baaf7SBart Van Assche 882e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 883e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 884e48354ceSNicholas Bellinger if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) 885e48354ceSNicholas Bellinger continue; 886e48354ceSNicholas Bellinger 887e48354ceSNicholas Bellinger if (!ooo_cmdsn->cmd) { 888e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 889e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 890e48354ceSNicholas Bellinger continue; 891e48354ceSNicholas Bellinger } 892e48354ceSNicholas Bellinger 893e48354ceSNicholas Bellinger cmd = ooo_cmdsn->cmd; 894e48354ceSNicholas Bellinger cmd->i_state = cmd->deferred_i_state; 895e48354ceSNicholas Bellinger ooo_count++; 896e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 897e48354ceSNicholas Bellinger pr_debug("Executing out of order CmdSN: 0x%08x," 898e48354ceSNicholas Bellinger " incremented ExpCmdSN to 0x%08x.\n", 899e48354ceSNicholas Bellinger cmd->cmd_sn, sess->exp_cmd_sn); 900e48354ceSNicholas Bellinger 901e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 902e48354ceSNicholas Bellinger 903e48354ceSNicholas Bellinger if (iscsit_execute_cmd(cmd, 1) < 0) 904e48354ceSNicholas Bellinger return -1; 905e48354ceSNicholas Bellinger 906e48354ceSNicholas Bellinger continue; 907e48354ceSNicholas Bellinger } 908e48354ceSNicholas Bellinger 909e48354ceSNicholas Bellinger return ooo_count; 910e48354ceSNicholas Bellinger } 911e48354ceSNicholas Bellinger 912e48354ceSNicholas Bellinger /* 913e48354ceSNicholas Bellinger * Called either: 914e48354ceSNicholas Bellinger * 915e48354ceSNicholas Bellinger * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() 916e48354ceSNicholas Bellinger * or iscsi_check_received_cmdsn(). 917e48354ceSNicholas Bellinger * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions 918e48354ceSNicholas Bellinger * for immediate commands. 919e48354ceSNicholas Bellinger */ 920e48354ceSNicholas Bellinger int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) 921e48354ceSNicholas Bellinger { 922e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 9233e1c81a9SNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 924e48354ceSNicholas Bellinger int lr = 0; 925e48354ceSNicholas Bellinger 926e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 927e48354ceSNicholas Bellinger if (ooo) 928e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_OOO_CMDSN; 929e48354ceSNicholas Bellinger 930e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 931e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 932e48354ceSNicholas Bellinger /* 933e48354ceSNicholas Bellinger * Go ahead and send the CHECK_CONDITION status for 934de103c93SChristoph Hellwig * any SCSI CDB exceptions that may have occurred. 935e48354ceSNicholas Bellinger */ 936de103c93SChristoph Hellwig if (cmd->sense_reason) { 937de103c93SChristoph Hellwig if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { 938e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 939e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 940e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 941e48354ceSNicholas Bellinger cmd->i_state); 942e48354ceSNicholas Bellinger return 0; 943e48354ceSNicholas Bellinger } 944e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 945aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 946e48354ceSNicholas Bellinger return 0; 947e48354ceSNicholas Bellinger return transport_send_check_condition_and_sense(se_cmd, 948de103c93SChristoph Hellwig cmd->sense_reason, 0); 949e48354ceSNicholas Bellinger } 950e48354ceSNicholas Bellinger /* 951e48354ceSNicholas Bellinger * Special case for delayed CmdSN with Immediate 952e48354ceSNicholas Bellinger * Data and/or Unsolicited Data Out attached. 953e48354ceSNicholas Bellinger */ 954e48354ceSNicholas Bellinger if (cmd->immediate_data) { 955e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 956e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 95767441b68SChristoph Hellwig target_execute_cmd(&cmd->se_cmd); 95867441b68SChristoph Hellwig return 0; 959e48354ceSNicholas Bellinger } 960e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 961e48354ceSNicholas Bellinger 962e48354ceSNicholas Bellinger if (!(cmd->cmd_flags & 963e48354ceSNicholas Bellinger ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 964aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 965e48354ceSNicholas Bellinger return 0; 966e48354ceSNicholas Bellinger 967e48354ceSNicholas Bellinger iscsit_set_dataout_sequence_values(cmd); 9683e1c81a9SNicholas Bellinger conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 969e48354ceSNicholas Bellinger } 970e48354ceSNicholas Bellinger return 0; 971e48354ceSNicholas Bellinger } 972e48354ceSNicholas Bellinger /* 973e48354ceSNicholas Bellinger * The default handler. 974e48354ceSNicholas Bellinger */ 975e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 976e48354ceSNicholas Bellinger 977e48354ceSNicholas Bellinger if ((cmd->data_direction == DMA_TO_DEVICE) && 978e48354ceSNicholas Bellinger !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 979aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 980e48354ceSNicholas Bellinger return 0; 981e48354ceSNicholas Bellinger 9823e1c81a9SNicholas Bellinger iscsit_set_unsoliticed_dataout(cmd); 983e48354ceSNicholas Bellinger } 984e48354ceSNicholas Bellinger return transport_handle_cdb_direct(&cmd->se_cmd); 985e48354ceSNicholas Bellinger 986e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 987e48354ceSNicholas Bellinger case ISCSI_OP_TEXT: 988e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 989e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 990e48354ceSNicholas Bellinger break; 991e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_TMFUNC: 992de103c93SChristoph Hellwig if (cmd->se_cmd.se_tmr_req->response) { 993e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 994e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 995e48354ceSNicholas Bellinger cmd->i_state); 996e48354ceSNicholas Bellinger return 0; 997e48354ceSNicholas Bellinger } 998e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 999e48354ceSNicholas Bellinger 1000e48354ceSNicholas Bellinger return transport_generic_handle_tmr(&cmd->se_cmd); 1001e48354ceSNicholas Bellinger case ISCSI_OP_LOGOUT: 1002e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1003e48354ceSNicholas Bellinger switch (cmd->logout_reason) { 1004e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 1005e48354ceSNicholas Bellinger lr = iscsit_logout_closesession(cmd, cmd->conn); 1006e48354ceSNicholas Bellinger break; 1007e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 1008e48354ceSNicholas Bellinger lr = iscsit_logout_closeconnection(cmd, cmd->conn); 1009e48354ceSNicholas Bellinger break; 1010e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_RECOVERY: 1011e48354ceSNicholas Bellinger lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); 1012e48354ceSNicholas Bellinger break; 1013e48354ceSNicholas Bellinger default: 1014e48354ceSNicholas Bellinger pr_err("Unknown iSCSI Logout Request Code:" 1015e48354ceSNicholas Bellinger " 0x%02x\n", cmd->logout_reason); 1016e48354ceSNicholas Bellinger return -1; 1017e48354ceSNicholas Bellinger } 1018e48354ceSNicholas Bellinger 1019e48354ceSNicholas Bellinger return lr; 1020e48354ceSNicholas Bellinger default: 1021e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 1022e48354ceSNicholas Bellinger pr_err("Cannot perform out of order execution for" 1023e48354ceSNicholas Bellinger " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); 1024e48354ceSNicholas Bellinger return -1; 1025e48354ceSNicholas Bellinger } 1026e48354ceSNicholas Bellinger 1027e48354ceSNicholas Bellinger return 0; 1028e48354ceSNicholas Bellinger } 1029e48354ceSNicholas Bellinger 1030e48354ceSNicholas Bellinger void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) 1031e48354ceSNicholas Bellinger { 1032e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 1033e48354ceSNicholas Bellinger 1034e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 1035e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 1036e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 1037e48354ceSNicholas Bellinger 1038e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 1039e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1040e48354ceSNicholas Bellinger } 1041e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 1042e48354ceSNicholas Bellinger } 1043e48354ceSNicholas Bellinger 1044e48354ceSNicholas Bellinger int iscsit_handle_ooo_cmdsn( 1045e48354ceSNicholas Bellinger struct iscsi_session *sess, 1046e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1047e48354ceSNicholas Bellinger u32 cmdsn) 1048e48354ceSNicholas Bellinger { 1049e48354ceSNicholas Bellinger int batch = 0; 1050e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; 1051e48354ceSNicholas Bellinger 1052e48354ceSNicholas Bellinger cmd->deferred_i_state = cmd->i_state; 1053e48354ceSNicholas Bellinger cmd->i_state = ISTATE_DEFERRED_CMD; 1054e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_OOO_CMDSN; 1055e48354ceSNicholas Bellinger 1056e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 1057e48354ceSNicholas Bellinger batch = 1; 1058e48354ceSNicholas Bellinger else { 1059e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 1060e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 1061e48354ceSNicholas Bellinger if (ooo_tail->cmdsn != (cmdsn - 1)) 1062e48354ceSNicholas Bellinger batch = 1; 1063e48354ceSNicholas Bellinger } 1064e48354ceSNicholas Bellinger 1065e48354ceSNicholas Bellinger ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); 1066e48354ceSNicholas Bellinger if (!ooo_cmdsn) 1067561bf158SNicholas Bellinger return -ENOMEM; 1068e48354ceSNicholas Bellinger 1069e48354ceSNicholas Bellinger ooo_cmdsn->cmd = cmd; 1070e48354ceSNicholas Bellinger ooo_cmdsn->batch_count = (batch) ? 1071e48354ceSNicholas Bellinger (cmdsn - sess->exp_cmd_sn) : 1; 1072e48354ceSNicholas Bellinger ooo_cmdsn->cid = cmd->conn->cid; 1073e48354ceSNicholas Bellinger ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; 1074e48354ceSNicholas Bellinger ooo_cmdsn->cmdsn = cmdsn; 1075e48354ceSNicholas Bellinger 1076e48354ceSNicholas Bellinger if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { 1077e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1078561bf158SNicholas Bellinger return -ENOMEM; 1079e48354ceSNicholas Bellinger } 1080e48354ceSNicholas Bellinger 1081561bf158SNicholas Bellinger return 0; 1082e48354ceSNicholas Bellinger } 1083e48354ceSNicholas Bellinger 1084e48354ceSNicholas Bellinger static int iscsit_set_dataout_timeout_values( 1085e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1086e48354ceSNicholas Bellinger u32 *offset, 1087e48354ceSNicholas Bellinger u32 *length) 1088e48354ceSNicholas Bellinger { 1089e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1090e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 1091e48354ceSNicholas Bellinger 1092e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 1093e48354ceSNicholas Bellinger *offset = 0; 1094e48354ceSNicholas Bellinger *length = (conn->sess->sess_ops->FirstBurstLength > 1095ebf1d95cSAndy Grover cmd->se_cmd.data_length) ? 1096ebf1d95cSAndy Grover cmd->se_cmd.data_length : 1097e48354ceSNicholas Bellinger conn->sess->sess_ops->FirstBurstLength; 1098e48354ceSNicholas Bellinger return 0; 1099e48354ceSNicholas Bellinger } 1100e48354ceSNicholas Bellinger 1101e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 1102e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 1103e48354ceSNicholas Bellinger pr_err("cmd->cmd_r2t_list is empty!\n"); 1104e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1105e48354ceSNicholas Bellinger return -1; 1106e48354ceSNicholas Bellinger } 1107e48354ceSNicholas Bellinger 1108e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 1109e48354ceSNicholas Bellinger if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { 1110e48354ceSNicholas Bellinger *offset = r2t->offset; 1111e48354ceSNicholas Bellinger *length = r2t->xfer_len; 1112e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1113e48354ceSNicholas Bellinger return 0; 1114e48354ceSNicholas Bellinger } 1115e48354ceSNicholas Bellinger } 1116e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1117e48354ceSNicholas Bellinger 1118e48354ceSNicholas Bellinger pr_err("Unable to locate any incomplete DataOUT" 1119e48354ceSNicholas Bellinger " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); 1120e48354ceSNicholas Bellinger 1121e48354ceSNicholas Bellinger return -1; 1122e48354ceSNicholas Bellinger } 1123e48354ceSNicholas Bellinger 1124e48354ceSNicholas Bellinger /* 1125e48354ceSNicholas Bellinger * NOTE: Called from interrupt (timer) context. 1126e48354ceSNicholas Bellinger */ 1127f7c9564aSKees Cook void iscsit_handle_dataout_timeout(struct timer_list *t) 1128e48354ceSNicholas Bellinger { 1129e48354ceSNicholas Bellinger u32 pdu_length = 0, pdu_offset = 0; 1130e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 1131f7c9564aSKees Cook struct iscsi_cmd *cmd = from_timer(cmd, t, dataout_timer); 1132e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1133e48354ceSNicholas Bellinger struct iscsi_session *sess = NULL; 1134e48354ceSNicholas Bellinger struct iscsi_node_attrib *na; 1135e48354ceSNicholas Bellinger 1136e48354ceSNicholas Bellinger iscsit_inc_conn_usage_count(conn); 1137e48354ceSNicholas Bellinger 1138e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1139e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { 1140e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1141e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1142e48354ceSNicholas Bellinger return; 1143e48354ceSNicholas Bellinger } 1144e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1145e48354ceSNicholas Bellinger sess = conn->sess; 1146e48354ceSNicholas Bellinger na = iscsit_tpg_get_node_attrib(sess); 1147e48354ceSNicholas Bellinger 1148e48354ceSNicholas Bellinger if (!sess->sess_ops->ErrorRecoveryLevel) { 1149d9a771fdSDavid Disseldorp pr_err("Unable to recover from DataOut timeout while" 1150d9a771fdSDavid Disseldorp " in ERL=0, closing iSCSI connection for I_T Nexus" 1151d9a771fdSDavid Disseldorp " %s,i,0x%6phN,%s,t,0x%02x\n", 1152d9a771fdSDavid Disseldorp sess->sess_ops->InitiatorName, sess->isid, 1153d9a771fdSDavid Disseldorp sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); 1154e48354ceSNicholas Bellinger goto failure; 1155e48354ceSNicholas Bellinger } 1156e48354ceSNicholas Bellinger 1157e48354ceSNicholas Bellinger if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { 1158d9a771fdSDavid Disseldorp pr_err("Command ITT: 0x%08x exceeded max retries" 1159d9a771fdSDavid Disseldorp " for DataOUT timeout %u, closing iSCSI connection for" 1160d9a771fdSDavid Disseldorp " I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n", 1161d9a771fdSDavid Disseldorp cmd->init_task_tag, na->dataout_timeout_retries, 1162d9a771fdSDavid Disseldorp sess->sess_ops->InitiatorName, sess->isid, 1163d9a771fdSDavid Disseldorp sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); 1164e48354ceSNicholas Bellinger goto failure; 1165e48354ceSNicholas Bellinger } 1166e48354ceSNicholas Bellinger 1167e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 1168e48354ceSNicholas Bellinger 1169e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 1170e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 1171e48354ceSNicholas Bellinger pdu_offset = cmd->write_data_done; 1172e48354ceSNicholas Bellinger if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - 1173ebf1d95cSAndy Grover cmd->next_burst_len)) > cmd->se_cmd.data_length) 1174ebf1d95cSAndy Grover pdu_length = (cmd->se_cmd.data_length - 1175e48354ceSNicholas Bellinger cmd->write_data_done); 1176e48354ceSNicholas Bellinger else 1177e48354ceSNicholas Bellinger pdu_length = (conn->sess->sess_ops->MaxBurstLength - 1178e48354ceSNicholas Bellinger cmd->next_burst_len); 1179e48354ceSNicholas Bellinger } else { 1180e48354ceSNicholas Bellinger pdu_offset = cmd->seq_start_offset; 1181e48354ceSNicholas Bellinger pdu_length = (cmd->seq_end_offset - 1182e48354ceSNicholas Bellinger cmd->seq_start_offset); 1183e48354ceSNicholas Bellinger } 1184e48354ceSNicholas Bellinger } else { 1185e48354ceSNicholas Bellinger if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, 1186e48354ceSNicholas Bellinger &pdu_length) < 0) 1187e48354ceSNicholas Bellinger goto failure; 1188e48354ceSNicholas Bellinger } 1189e48354ceSNicholas Bellinger 1190e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 1191e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 1192e48354ceSNicholas Bellinger goto failure; 1193e48354ceSNicholas Bellinger 1194e48354ceSNicholas Bellinger pr_debug("Command ITT: 0x%08x timed out waiting for" 1195e48354ceSNicholas Bellinger " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", 1196e48354ceSNicholas Bellinger cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : 1197e48354ceSNicholas Bellinger "", r2t_offset, r2t_length); 1198e48354ceSNicholas Bellinger 1199e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) 1200e48354ceSNicholas Bellinger goto failure; 1201e48354ceSNicholas Bellinger 1202e48354ceSNicholas Bellinger iscsit_start_dataout_timer(cmd, conn); 1203e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1204e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1205e48354ceSNicholas Bellinger 1206e48354ceSNicholas Bellinger return; 1207e48354ceSNicholas Bellinger 1208e48354ceSNicholas Bellinger failure: 1209e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 121033b3f8caSDavid Disseldorp iscsit_fill_cxn_timeout_err_stats(sess); 1211e48354ceSNicholas Bellinger iscsit_cause_connection_reinstatement(conn, 0); 1212e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1213e48354ceSNicholas Bellinger } 1214e48354ceSNicholas Bellinger 1215e48354ceSNicholas Bellinger void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) 1216e48354ceSNicholas Bellinger { 1217e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1218e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1219e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1220e48354ceSNicholas Bellinger 1221e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1222e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1223e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1224e48354ceSNicholas Bellinger return; 1225e48354ceSNicholas Bellinger } 1226e48354ceSNicholas Bellinger 1227e48354ceSNicholas Bellinger mod_timer(&cmd->dataout_timer, 1228e48354ceSNicholas Bellinger (get_jiffies_64() + na->dataout_timeout * HZ)); 1229e48354ceSNicholas Bellinger pr_debug("Updated DataOUT timer for ITT: 0x%08x", 1230e48354ceSNicholas Bellinger cmd->init_task_tag); 1231e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1232e48354ceSNicholas Bellinger } 1233e48354ceSNicholas Bellinger 1234e48354ceSNicholas Bellinger void iscsit_start_dataout_timer( 1235e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1236e48354ceSNicholas Bellinger struct iscsi_conn *conn) 1237e48354ceSNicholas Bellinger { 1238e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1239e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1240e48354ceSNicholas Bellinger 1241618baaf7SBart Van Assche lockdep_assert_held(&cmd->dataout_timeout_lock); 1242618baaf7SBart Van Assche 1243e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) 1244e48354ceSNicholas Bellinger return; 1245e48354ceSNicholas Bellinger 1246e48354ceSNicholas Bellinger pr_debug("Starting DataOUT timer for ITT: 0x%08x on" 1247e48354ceSNicholas Bellinger " CID: %hu.\n", cmd->init_task_tag, conn->cid); 1248e48354ceSNicholas Bellinger 1249e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; 1250e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; 12518a47aa9dSBart Van Assche mod_timer(&cmd->dataout_timer, jiffies + na->dataout_timeout * HZ); 1252e48354ceSNicholas Bellinger } 1253e48354ceSNicholas Bellinger 1254e48354ceSNicholas Bellinger void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) 1255e48354ceSNicholas Bellinger { 1256e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1257e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1258e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1259e48354ceSNicholas Bellinger return; 1260e48354ceSNicholas Bellinger } 1261e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_STOP; 1262e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1263e48354ceSNicholas Bellinger 1264e48354ceSNicholas Bellinger del_timer_sync(&cmd->dataout_timer); 1265e48354ceSNicholas Bellinger 1266e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1267e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1268e48354ceSNicholas Bellinger pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", 1269e48354ceSNicholas Bellinger cmd->init_task_tag); 1270e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1271e48354ceSNicholas Bellinger } 12723e1c81a9SNicholas Bellinger EXPORT_SYMBOL(iscsit_stop_dataout_timer); 1273