1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2e48354ceSNicholas Bellinger /******************************************************************************* 3e48354ceSNicholas Bellinger * This file contains error recovery level one used by the iSCSI Target driver. 4e48354ceSNicholas Bellinger * 54c76251eSNicholas Bellinger * (c) Copyright 2007-2013 Datera, Inc. 6e48354ceSNicholas Bellinger * 7e48354ceSNicholas Bellinger * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8e48354ceSNicholas Bellinger * 9e48354ceSNicholas Bellinger ******************************************************************************/ 10e48354ceSNicholas Bellinger 11e48354ceSNicholas Bellinger #include <linux/list.h> 128dcf07beSBart Van Assche #include <linux/slab.h> 13e48354ceSNicholas Bellinger #include <scsi/iscsi_proto.h> 14e48354ceSNicholas Bellinger #include <target/target_core_base.h> 15c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 163e1c81a9SNicholas Bellinger #include <target/iscsi/iscsi_transport.h> 17e48354ceSNicholas Bellinger 1867f091f2SSagi Grimberg #include <target/iscsi/iscsi_target_core.h> 19e48354ceSNicholas Bellinger #include "iscsi_target_seq_pdu_list.h" 20e48354ceSNicholas Bellinger #include "iscsi_target_datain_values.h" 21e48354ceSNicholas Bellinger #include "iscsi_target_device.h" 22e48354ceSNicholas Bellinger #include "iscsi_target_tpg.h" 23e48354ceSNicholas Bellinger #include "iscsi_target_util.h" 24e48354ceSNicholas Bellinger #include "iscsi_target_erl0.h" 25e48354ceSNicholas Bellinger #include "iscsi_target_erl1.h" 26e48354ceSNicholas Bellinger #include "iscsi_target_erl2.h" 27e48354ceSNicholas Bellinger #include "iscsi_target.h" 28e48354ceSNicholas Bellinger 29919765e9SBart Van Assche #define OFFLOAD_BUF_SIZE 32768U 30e48354ceSNicholas Bellinger 31e48354ceSNicholas Bellinger /* 32e48354ceSNicholas Bellinger * Used to dump excess datain payload for certain error recovery 33e48354ceSNicholas Bellinger * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). 34e48354ceSNicholas Bellinger * 35e48354ceSNicholas Bellinger * dump_padding_digest denotes if padding and data digests need 36e48354ceSNicholas Bellinger * to be dumped. 37e48354ceSNicholas Bellinger */ 38e48354ceSNicholas Bellinger int iscsit_dump_data_payload( 39e48354ceSNicholas Bellinger struct iscsi_conn *conn, 40e48354ceSNicholas Bellinger u32 buf_len, 41e48354ceSNicholas Bellinger int dump_padding_digest) 42e48354ceSNicholas Bellinger { 43658c3122SBart Van Assche char *buf; 44e48354ceSNicholas Bellinger int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; 45658c3122SBart Van Assche u32 length, offset = 0, size; 46e48354ceSNicholas Bellinger struct kvec iov; 47e48354ceSNicholas Bellinger 483e1c81a9SNicholas Bellinger if (conn->sess->sess_ops->RDMAExtensions) 493e1c81a9SNicholas Bellinger return 0; 503e1c81a9SNicholas Bellinger 51658c3122SBart Van Assche if (dump_padding_digest) { 52658c3122SBart Van Assche buf_len = ALIGN(buf_len, 4); 53658c3122SBart Van Assche if (conn->conn_ops->DataDigest) 54658c3122SBart Van Assche buf_len += ISCSI_CRC_LEN; 55658c3122SBart Van Assche } 56658c3122SBart Van Assche 57919765e9SBart Van Assche length = min(buf_len, OFFLOAD_BUF_SIZE); 58e48354ceSNicholas Bellinger 59e48354ceSNicholas Bellinger buf = kzalloc(length, GFP_ATOMIC); 60e48354ceSNicholas Bellinger if (!buf) { 61e48354ceSNicholas Bellinger pr_err("Unable to allocate %u bytes for offload" 62e48354ceSNicholas Bellinger " buffer.\n", length); 63e48354ceSNicholas Bellinger return -1; 64e48354ceSNicholas Bellinger } 65e48354ceSNicholas Bellinger memset(&iov, 0, sizeof(struct kvec)); 66e48354ceSNicholas Bellinger 67e48354ceSNicholas Bellinger while (offset < buf_len) { 68919765e9SBart Van Assche size = min(buf_len - offset, length); 69e48354ceSNicholas Bellinger 70e48354ceSNicholas Bellinger iov.iov_len = size; 71e48354ceSNicholas Bellinger iov.iov_base = buf; 72e48354ceSNicholas Bellinger 73e48354ceSNicholas Bellinger rx_got = rx_data(conn, &iov, 1, size); 74e48354ceSNicholas Bellinger if (rx_got != size) { 75e48354ceSNicholas Bellinger ret = DATAOUT_CANNOT_RECOVER; 76658c3122SBart Van Assche break; 77e48354ceSNicholas Bellinger } 78e48354ceSNicholas Bellinger 79e48354ceSNicholas Bellinger offset += size; 80e48354ceSNicholas Bellinger } 81e48354ceSNicholas Bellinger 82e48354ceSNicholas Bellinger kfree(buf); 83e48354ceSNicholas Bellinger return ret; 84e48354ceSNicholas Bellinger } 85e48354ceSNicholas Bellinger 86e48354ceSNicholas Bellinger /* 87e48354ceSNicholas Bellinger * Used for retransmitting R2Ts from a R2T SNACK request. 88e48354ceSNicholas Bellinger */ 89e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t_for_snack( 90e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 91e48354ceSNicholas Bellinger struct iscsi_r2t *r2t) 92e48354ceSNicholas Bellinger { 93e48354ceSNicholas Bellinger /* 94e48354ceSNicholas Bellinger * If the struct iscsi_r2t has not been sent yet, we can safely 95e48354ceSNicholas Bellinger * ignore retransmission 96e48354ceSNicholas Bellinger * of the R2TSN in question. 97e48354ceSNicholas Bellinger */ 98e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 99e48354ceSNicholas Bellinger if (!r2t->sent_r2t) { 100e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 101e48354ceSNicholas Bellinger return 0; 102e48354ceSNicholas Bellinger } 103e48354ceSNicholas Bellinger r2t->sent_r2t = 0; 104e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 105e48354ceSNicholas Bellinger 106e48354ceSNicholas Bellinger iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 107e48354ceSNicholas Bellinger 108e48354ceSNicholas Bellinger return 0; 109e48354ceSNicholas Bellinger } 110e48354ceSNicholas Bellinger 111e48354ceSNicholas Bellinger static int iscsit_handle_r2t_snack( 112e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 113e48354ceSNicholas Bellinger unsigned char *buf, 114e48354ceSNicholas Bellinger u32 begrun, 115e48354ceSNicholas Bellinger u32 runlength) 116e48354ceSNicholas Bellinger { 117e48354ceSNicholas Bellinger u32 last_r2tsn; 118e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 119e48354ceSNicholas Bellinger 120e48354ceSNicholas Bellinger /* 121e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 122e48354ceSNicholas Bellinger * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. 123e48354ceSNicholas Bellinger */ 124e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 125e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 126e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, R2T SNACK requesting" 127e48354ceSNicholas Bellinger " retransmission of R2TSN: 0x%08x to 0x%08x but already" 128e48354ceSNicholas Bellinger " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," 129e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 130e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 131e48354ceSNicholas Bellinger 1325a342521SBart Van Assche return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 133e48354ceSNicholas Bellinger } 134e48354ceSNicholas Bellinger 135e48354ceSNicholas Bellinger if (runlength) { 136e48354ceSNicholas Bellinger if ((begrun + runlength) > cmd->r2t_sn) { 137e48354ceSNicholas Bellinger pr_err("Command ITT: 0x%08x received R2T SNACK" 138e48354ceSNicholas Bellinger " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" 139e48354ceSNicholas Bellinger " current R2TSN: 0x%08x, protocol error.\n", 140e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); 141ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, 142ba159914SNicholas Bellinger ISCSI_REASON_BOOKMARK_INVALID, buf); 143e48354ceSNicholas Bellinger } 144e48354ceSNicholas Bellinger last_r2tsn = (begrun + runlength); 145e48354ceSNicholas Bellinger } else 146e48354ceSNicholas Bellinger last_r2tsn = cmd->r2t_sn; 147e48354ceSNicholas Bellinger 148e48354ceSNicholas Bellinger while (begrun < last_r2tsn) { 149e48354ceSNicholas Bellinger r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); 150e48354ceSNicholas Bellinger if (!r2t) 151e48354ceSNicholas Bellinger return -1; 152e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) 153e48354ceSNicholas Bellinger return -1; 154e48354ceSNicholas Bellinger 155e48354ceSNicholas Bellinger begrun++; 156e48354ceSNicholas Bellinger } 157e48354ceSNicholas Bellinger 158e48354ceSNicholas Bellinger return 0; 159e48354ceSNicholas Bellinger } 160e48354ceSNicholas Bellinger 161e48354ceSNicholas Bellinger /* 162e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 163e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 164e48354ceSNicholas Bellinger * 165e48354ceSNicholas Bellinger * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. 166e48354ceSNicholas Bellinger * 167e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 168e48354ceSNicholas Bellinger */ 169e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_yes( 170e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 171e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 172e48354ceSNicholas Bellinger { 173e48354ceSNicholas Bellinger u32 data_sn = 0, data_sn_count = 0; 174e48354ceSNicholas Bellinger u32 pdu_start = 0, seq_no = 0; 175e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 176e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 177e48354ceSNicholas Bellinger 178e48354ceSNicholas Bellinger while (begrun > data_sn++) { 179e48354ceSNicholas Bellinger data_sn_count++; 180e48354ceSNicholas Bellinger if ((dr->next_burst_len + 181e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength) < 182e48354ceSNicholas Bellinger conn->sess->sess_ops->MaxBurstLength) { 183e48354ceSNicholas Bellinger dr->read_data_done += 184e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 185e48354ceSNicholas Bellinger dr->next_burst_len += 186e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 187e48354ceSNicholas Bellinger } else { 188e48354ceSNicholas Bellinger dr->read_data_done += 189e48354ceSNicholas Bellinger (conn->sess->sess_ops->MaxBurstLength - 190e48354ceSNicholas Bellinger dr->next_burst_len); 191e48354ceSNicholas Bellinger dr->next_burst_len = 0; 192e48354ceSNicholas Bellinger pdu_start += data_sn_count; 193e48354ceSNicholas Bellinger data_sn_count = 0; 194e48354ceSNicholas Bellinger seq_no++; 195e48354ceSNicholas Bellinger } 196e48354ceSNicholas Bellinger } 197e48354ceSNicholas Bellinger 198e48354ceSNicholas Bellinger if (!conn->sess->sess_ops->DataPDUInOrder) { 199e48354ceSNicholas Bellinger cmd->seq_no = seq_no; 200e48354ceSNicholas Bellinger cmd->pdu_start = pdu_start; 201e48354ceSNicholas Bellinger cmd->pdu_send_order = data_sn_count; 202e48354ceSNicholas Bellinger } 203e48354ceSNicholas Bellinger 204e48354ceSNicholas Bellinger return 0; 205e48354ceSNicholas Bellinger } 206e48354ceSNicholas Bellinger 207e48354ceSNicholas Bellinger /* 208e48354ceSNicholas Bellinger * Generates Offsets and NextBurstLength based on Begrun and Runlength 209e48354ceSNicholas Bellinger * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 210e48354ceSNicholas Bellinger * 211e48354ceSNicholas Bellinger * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. 212e48354ceSNicholas Bellinger * 213e48354ceSNicholas Bellinger * FIXME: How is this handled for a RData SNACK? 214e48354ceSNicholas Bellinger */ 215e48354ceSNicholas Bellinger int iscsit_create_recovery_datain_values_datasequenceinorder_no( 216e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 217e48354ceSNicholas Bellinger struct iscsi_datain_req *dr) 218e48354ceSNicholas Bellinger { 219e48354ceSNicholas Bellinger int found_seq = 0, i; 220e48354ceSNicholas Bellinger u32 data_sn, read_data_done = 0, seq_send_order = 0; 221e48354ceSNicholas Bellinger u32 begrun = dr->begrun; 222e48354ceSNicholas Bellinger u32 runlength = dr->runlength; 223e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 224e48354ceSNicholas Bellinger struct iscsi_seq *first_seq = NULL, *seq = NULL; 225e48354ceSNicholas Bellinger 226e48354ceSNicholas Bellinger if (!cmd->seq_list) { 227e48354ceSNicholas Bellinger pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 228e48354ceSNicholas Bellinger return -1; 229e48354ceSNicholas Bellinger } 230e48354ceSNicholas Bellinger 231e48354ceSNicholas Bellinger /* 232e48354ceSNicholas Bellinger * Calculate read_data_done for all sequences containing a 233e48354ceSNicholas Bellinger * first_datasn and last_datasn less than the BegRun. 234e48354ceSNicholas Bellinger * 235e48354ceSNicholas Bellinger * Locate the struct iscsi_seq the BegRun lies within and calculate 236e48354ceSNicholas Bellinger * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. 237e48354ceSNicholas Bellinger * 238e48354ceSNicholas Bellinger * Also use struct iscsi_seq->seq_send_order to determine where to start. 239e48354ceSNicholas Bellinger */ 240e48354ceSNicholas Bellinger for (i = 0; i < cmd->seq_count; i++) { 241e48354ceSNicholas Bellinger seq = &cmd->seq_list[i]; 242e48354ceSNicholas Bellinger 243e48354ceSNicholas Bellinger if (!seq->seq_send_order) 244e48354ceSNicholas Bellinger first_seq = seq; 245e48354ceSNicholas Bellinger 246e48354ceSNicholas Bellinger /* 247e48354ceSNicholas Bellinger * No data has been transferred for this DataIN sequence, so the 248e48354ceSNicholas Bellinger * seq->first_datasn and seq->last_datasn have not been set. 249e48354ceSNicholas Bellinger */ 250e48354ceSNicholas Bellinger if (!seq->sent) { 251e48354ceSNicholas Bellinger pr_err("Ignoring non-sent sequence 0x%08x ->" 252e48354ceSNicholas Bellinger " 0x%08x\n\n", seq->first_datasn, 253e48354ceSNicholas Bellinger seq->last_datasn); 254e48354ceSNicholas Bellinger continue; 255e48354ceSNicholas Bellinger } 256e48354ceSNicholas Bellinger 257e48354ceSNicholas Bellinger /* 258e48354ceSNicholas Bellinger * This DataIN sequence is precedes the received BegRun, add the 259e48354ceSNicholas Bellinger * total xfer_len of the sequence to read_data_done and reset 260e48354ceSNicholas Bellinger * seq->pdu_send_order. 261e48354ceSNicholas Bellinger */ 262e48354ceSNicholas Bellinger if ((seq->first_datasn < begrun) && 263e48354ceSNicholas Bellinger (seq->last_datasn < begrun)) { 264e48354ceSNicholas Bellinger pr_err("Pre BegRun sequence 0x%08x ->" 265e48354ceSNicholas Bellinger " 0x%08x\n", seq->first_datasn, 266e48354ceSNicholas Bellinger seq->last_datasn); 2678b1e1244SAndy Grover 268e48354ceSNicholas Bellinger read_data_done += cmd->seq_list[i].xfer_len; 269e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 270e48354ceSNicholas Bellinger continue; 271e48354ceSNicholas Bellinger } 272e48354ceSNicholas Bellinger 273e48354ceSNicholas Bellinger /* 274e48354ceSNicholas Bellinger * The BegRun lies within this DataIN sequence. 275e48354ceSNicholas Bellinger */ 276e48354ceSNicholas Bellinger if ((seq->first_datasn <= begrun) && 277e48354ceSNicholas Bellinger (seq->last_datasn >= begrun)) { 278e48354ceSNicholas Bellinger pr_err("Found sequence begrun: 0x%08x in" 279e48354ceSNicholas Bellinger " 0x%08x -> 0x%08x\n", begrun, 280e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 2818b1e1244SAndy Grover 282e48354ceSNicholas Bellinger seq_send_order = seq->seq_send_order; 283e48354ceSNicholas Bellinger data_sn = seq->first_datasn; 284e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 285e48354ceSNicholas Bellinger found_seq = 1; 286e48354ceSNicholas Bellinger 287e48354ceSNicholas Bellinger /* 288e48354ceSNicholas Bellinger * For DataPDUInOrder=Yes, while the first DataSN of 289e48354ceSNicholas Bellinger * the sequence is less than the received BegRun, add 290e48354ceSNicholas Bellinger * the MaxRecvDataSegmentLength to read_data_done and 291e48354ceSNicholas Bellinger * to the sequence's next_burst_len; 292e48354ceSNicholas Bellinger * 293e48354ceSNicholas Bellinger * For DataPDUInOrder=No, while the first DataSN of the 294e48354ceSNicholas Bellinger * sequence is less than the received BegRun, find the 295e48354ceSNicholas Bellinger * struct iscsi_pdu of the DataSN in question and add the 296e48354ceSNicholas Bellinger * MaxRecvDataSegmentLength to read_data_done and to the 297e48354ceSNicholas Bellinger * sequence's next_burst_len; 298e48354ceSNicholas Bellinger */ 299e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 300e48354ceSNicholas Bellinger while (data_sn < begrun) { 301e48354ceSNicholas Bellinger seq->pdu_send_order++; 302e48354ceSNicholas Bellinger read_data_done += 303e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 304e48354ceSNicholas Bellinger seq->next_burst_len += 305e48354ceSNicholas Bellinger conn->conn_ops->MaxRecvDataSegmentLength; 306e48354ceSNicholas Bellinger data_sn++; 307e48354ceSNicholas Bellinger } 308e48354ceSNicholas Bellinger } else { 309e48354ceSNicholas Bellinger int j; 310e48354ceSNicholas Bellinger struct iscsi_pdu *pdu; 311e48354ceSNicholas Bellinger 312e48354ceSNicholas Bellinger while (data_sn < begrun) { 313e48354ceSNicholas Bellinger seq->pdu_send_order++; 314e48354ceSNicholas Bellinger 315e48354ceSNicholas Bellinger for (j = 0; j < seq->pdu_count; j++) { 316e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[ 317e48354ceSNicholas Bellinger seq->pdu_start + j]; 318e48354ceSNicholas Bellinger if (pdu->data_sn == data_sn) { 319e48354ceSNicholas Bellinger read_data_done += 320e48354ceSNicholas Bellinger pdu->length; 321e48354ceSNicholas Bellinger seq->next_burst_len += 322e48354ceSNicholas Bellinger pdu->length; 323e48354ceSNicholas Bellinger } 324e48354ceSNicholas Bellinger } 325e48354ceSNicholas Bellinger data_sn++; 326e48354ceSNicholas Bellinger } 327e48354ceSNicholas Bellinger } 328e48354ceSNicholas Bellinger continue; 329e48354ceSNicholas Bellinger } 330e48354ceSNicholas Bellinger 331e48354ceSNicholas Bellinger /* 332e48354ceSNicholas Bellinger * This DataIN sequence is larger than the received BegRun, 333e48354ceSNicholas Bellinger * reset seq->pdu_send_order and continue. 334e48354ceSNicholas Bellinger */ 335e48354ceSNicholas Bellinger if ((seq->first_datasn > begrun) || 336e48354ceSNicholas Bellinger (seq->last_datasn > begrun)) { 337e48354ceSNicholas Bellinger pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", 338e48354ceSNicholas Bellinger seq->first_datasn, seq->last_datasn); 3398b1e1244SAndy Grover 340e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 341e48354ceSNicholas Bellinger continue; 342e48354ceSNicholas Bellinger } 343e48354ceSNicholas Bellinger } 344e48354ceSNicholas Bellinger 345e48354ceSNicholas Bellinger if (!found_seq) { 346e48354ceSNicholas Bellinger if (!begrun) { 347e48354ceSNicholas Bellinger if (!first_seq) { 348e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Begrun: 0x%08x" 349e48354ceSNicholas Bellinger " but first_seq is NULL\n", 350e48354ceSNicholas Bellinger cmd->init_task_tag, begrun); 351e48354ceSNicholas Bellinger return -1; 352e48354ceSNicholas Bellinger } 353e48354ceSNicholas Bellinger seq_send_order = first_seq->seq_send_order; 354e48354ceSNicholas Bellinger seq->next_burst_len = seq->pdu_send_order = 0; 355e48354ceSNicholas Bellinger goto done; 356e48354ceSNicholas Bellinger } 357e48354ceSNicholas Bellinger 358e48354ceSNicholas Bellinger pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," 359e48354ceSNicholas Bellinger " BegRun: 0x%08x, RunLength: 0x%08x while" 360e48354ceSNicholas Bellinger " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", 361e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, runlength, 362e48354ceSNicholas Bellinger (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); 363e48354ceSNicholas Bellinger return -1; 364e48354ceSNicholas Bellinger } 365e48354ceSNicholas Bellinger 366e48354ceSNicholas Bellinger done: 367e48354ceSNicholas Bellinger dr->read_data_done = read_data_done; 368e48354ceSNicholas Bellinger dr->seq_send_order = seq_send_order; 369e48354ceSNicholas Bellinger 370e48354ceSNicholas Bellinger return 0; 371e48354ceSNicholas Bellinger } 372e48354ceSNicholas Bellinger 373e48354ceSNicholas Bellinger static int iscsit_handle_recovery_datain( 374e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 375e48354ceSNicholas Bellinger unsigned char *buf, 376e48354ceSNicholas Bellinger u32 begrun, 377e48354ceSNicholas Bellinger u32 runlength) 378e48354ceSNicholas Bellinger { 379e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 380e48354ceSNicholas Bellinger struct iscsi_datain_req *dr; 381e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 382e48354ceSNicholas Bellinger 3837d680f3bSChristoph Hellwig if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 384e48354ceSNicholas Bellinger pr_err("Ignoring ITT: 0x%08x Data SNACK\n", 385e48354ceSNicholas Bellinger cmd->init_task_tag); 386e48354ceSNicholas Bellinger return 0; 387e48354ceSNicholas Bellinger } 388e48354ceSNicholas Bellinger 389e48354ceSNicholas Bellinger /* 390e48354ceSNicholas Bellinger * Make sure the initiator is not requesting retransmission 391e48354ceSNicholas Bellinger * of DataSNs already acknowledged by a Data ACK SNACK. 392e48354ceSNicholas Bellinger */ 393e48354ceSNicholas Bellinger if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 394e48354ceSNicholas Bellinger (begrun <= cmd->acked_data_sn)) { 395e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x, Data SNACK requesting" 396e48354ceSNicholas Bellinger " retransmission of DataSN: 0x%08x to 0x%08x but" 397e48354ceSNicholas Bellinger " already acked to DataSN: 0x%08x by Data ACK SNACK," 398e48354ceSNicholas Bellinger " protocol error.\n", cmd->init_task_tag, begrun, 399e48354ceSNicholas Bellinger (begrun + runlength), cmd->acked_data_sn); 400e48354ceSNicholas Bellinger 401ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 402e48354ceSNicholas Bellinger } 403e48354ceSNicholas Bellinger 404e48354ceSNicholas Bellinger /* 405e48354ceSNicholas Bellinger * Make sure BegRun and RunLength in the Data SNACK are sane. 406e48354ceSNicholas Bellinger * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. 407e48354ceSNicholas Bellinger */ 408e48354ceSNicholas Bellinger if ((begrun + runlength) > (cmd->data_sn - 1)) { 409e48354ceSNicholas Bellinger pr_err("Initiator requesting BegRun: 0x%08x, RunLength" 410e48354ceSNicholas Bellinger ": 0x%08x greater than maximum DataSN: 0x%08x.\n", 411e48354ceSNicholas Bellinger begrun, runlength, (cmd->data_sn - 1)); 412ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, 413ba159914SNicholas Bellinger buf); 414e48354ceSNicholas Bellinger } 415e48354ceSNicholas Bellinger 416e48354ceSNicholas Bellinger dr = iscsit_allocate_datain_req(); 417e48354ceSNicholas Bellinger if (!dr) 418ba159914SNicholas Bellinger return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 419ba159914SNicholas Bellinger buf); 420e48354ceSNicholas Bellinger 421e48354ceSNicholas Bellinger dr->data_sn = dr->begrun = begrun; 422e48354ceSNicholas Bellinger dr->runlength = runlength; 423e48354ceSNicholas Bellinger dr->generate_recovery_values = 1; 424e48354ceSNicholas Bellinger dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; 425e48354ceSNicholas Bellinger 426e48354ceSNicholas Bellinger iscsit_attach_datain_req(cmd, dr); 427e48354ceSNicholas Bellinger 428e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_DATAIN; 429e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 430e48354ceSNicholas Bellinger 431e48354ceSNicholas Bellinger return 0; 432e48354ceSNicholas Bellinger } 433e48354ceSNicholas Bellinger 434e48354ceSNicholas Bellinger int iscsit_handle_recovery_datain_or_r2t( 435e48354ceSNicholas Bellinger struct iscsi_conn *conn, 436e48354ceSNicholas Bellinger unsigned char *buf, 43766c7db68SChristoph Hellwig itt_t init_task_tag, 438e48354ceSNicholas Bellinger u32 targ_xfer_tag, 439e48354ceSNicholas Bellinger u32 begrun, 440e48354ceSNicholas Bellinger u32 runlength) 441e48354ceSNicholas Bellinger { 442e48354ceSNicholas Bellinger struct iscsi_cmd *cmd; 443e48354ceSNicholas Bellinger 444e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); 445e48354ceSNicholas Bellinger if (!cmd) 446e48354ceSNicholas Bellinger return 0; 447e48354ceSNicholas Bellinger 448e48354ceSNicholas Bellinger /* 449e48354ceSNicholas Bellinger * FIXME: This will not work for bidi commands. 450e48354ceSNicholas Bellinger */ 451e48354ceSNicholas Bellinger switch (cmd->data_direction) { 452e48354ceSNicholas Bellinger case DMA_TO_DEVICE: 453e48354ceSNicholas Bellinger return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); 454e48354ceSNicholas Bellinger case DMA_FROM_DEVICE: 455e48354ceSNicholas Bellinger return iscsit_handle_recovery_datain(cmd, buf, begrun, 456e48354ceSNicholas Bellinger runlength); 457e48354ceSNicholas Bellinger default: 458e48354ceSNicholas Bellinger pr_err("Unknown cmd->data_direction: 0x%02x\n", 459e48354ceSNicholas Bellinger cmd->data_direction); 460e48354ceSNicholas Bellinger return -1; 461e48354ceSNicholas Bellinger } 462e48354ceSNicholas Bellinger 463e48354ceSNicholas Bellinger return 0; 464e48354ceSNicholas Bellinger } 465e48354ceSNicholas Bellinger 466e48354ceSNicholas Bellinger /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ 467e48354ceSNicholas Bellinger int iscsit_handle_status_snack( 468e48354ceSNicholas Bellinger struct iscsi_conn *conn, 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 = NULL; 475e48354ceSNicholas Bellinger u32 last_statsn; 476e48354ceSNicholas Bellinger int found_cmd; 477e48354ceSNicholas Bellinger 478752d8680SNicholas Bellinger if (!begrun) { 479752d8680SNicholas Bellinger begrun = conn->exp_statsn; 480752d8680SNicholas Bellinger } else if (conn->exp_statsn > begrun) { 481e48354ceSNicholas Bellinger pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" 482e48354ceSNicholas Bellinger " 0x%08x but already got ExpStatSN: 0x%08x on CID:" 483e48354ceSNicholas Bellinger " %hu.\n", begrun, runlength, conn->exp_statsn, 484e48354ceSNicholas Bellinger conn->cid); 485e48354ceSNicholas Bellinger return 0; 486e48354ceSNicholas Bellinger } 487e48354ceSNicholas Bellinger 488e48354ceSNicholas Bellinger last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); 489e48354ceSNicholas Bellinger 490e48354ceSNicholas Bellinger while (begrun < last_statsn) { 491e48354ceSNicholas Bellinger found_cmd = 0; 492e48354ceSNicholas Bellinger 493e48354ceSNicholas Bellinger spin_lock_bh(&conn->cmd_lock); 4942fbb471eSAndy Grover list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 495e48354ceSNicholas Bellinger if (cmd->stat_sn == begrun) { 496e48354ceSNicholas Bellinger found_cmd = 1; 497e48354ceSNicholas Bellinger break; 498e48354ceSNicholas Bellinger } 499e48354ceSNicholas Bellinger } 500e48354ceSNicholas Bellinger spin_unlock_bh(&conn->cmd_lock); 501e48354ceSNicholas Bellinger 502e48354ceSNicholas Bellinger if (!found_cmd) { 503e48354ceSNicholas Bellinger pr_err("Unable to find StatSN: 0x%08x for" 504e48354ceSNicholas Bellinger " a Status SNACK, assuming this was a" 505e48354ceSNicholas Bellinger " protactic SNACK for an untransmitted" 506e48354ceSNicholas Bellinger " StatSN, ignoring.\n", begrun); 507e48354ceSNicholas Bellinger begrun++; 508e48354ceSNicholas Bellinger continue; 509e48354ceSNicholas Bellinger } 510e48354ceSNicholas Bellinger 511e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 512e48354ceSNicholas Bellinger if (cmd->i_state == ISTATE_SEND_DATAIN) { 513e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 514e48354ceSNicholas Bellinger pr_err("Ignoring Status SNACK for BegRun:" 515e48354ceSNicholas Bellinger " 0x%08x, RunLength: 0x%08x, assuming this was" 516e48354ceSNicholas Bellinger " a protactic SNACK for an untransmitted" 517e48354ceSNicholas Bellinger " StatSN\n", begrun, runlength); 518e48354ceSNicholas Bellinger begrun++; 519e48354ceSNicholas Bellinger continue; 520e48354ceSNicholas Bellinger } 521e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 522e48354ceSNicholas Bellinger 523e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; 524e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 525e48354ceSNicholas Bellinger begrun++; 526e48354ceSNicholas Bellinger } 527e48354ceSNicholas Bellinger 528e48354ceSNicholas Bellinger return 0; 529e48354ceSNicholas Bellinger } 530e48354ceSNicholas Bellinger 531e48354ceSNicholas Bellinger int iscsit_handle_data_ack( 532e48354ceSNicholas Bellinger struct iscsi_conn *conn, 533e48354ceSNicholas Bellinger u32 targ_xfer_tag, 534e48354ceSNicholas Bellinger u32 begrun, 535e48354ceSNicholas Bellinger u32 runlength) 536e48354ceSNicholas Bellinger { 537e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 538e48354ceSNicholas Bellinger 539e48354ceSNicholas Bellinger cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); 540e48354ceSNicholas Bellinger if (!cmd) { 541e48354ceSNicholas Bellinger pr_err("Data ACK SNACK for TTT: 0x%08x is" 542e48354ceSNicholas Bellinger " invalid.\n", targ_xfer_tag); 543e48354ceSNicholas Bellinger return -1; 544e48354ceSNicholas Bellinger } 545e48354ceSNicholas Bellinger 546e48354ceSNicholas Bellinger if (begrun <= cmd->acked_data_sn) { 547e48354ceSNicholas Bellinger pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" 548e48354ceSNicholas Bellinger " less than the already acked DataSN: 0x%08x.\n", 549e48354ceSNicholas Bellinger cmd->init_task_tag, begrun, cmd->acked_data_sn); 550e48354ceSNicholas Bellinger return -1; 551e48354ceSNicholas Bellinger } 552e48354ceSNicholas Bellinger 553e48354ceSNicholas Bellinger /* 554e48354ceSNicholas Bellinger * For Data ACK SNACK, BegRun is the next expected DataSN. 555e48354ceSNicholas Bellinger * (see iSCSI v19: 10.16.6) 556e48354ceSNicholas Bellinger */ 557e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 558e48354ceSNicholas Bellinger cmd->acked_data_sn = (begrun - 1); 559e48354ceSNicholas Bellinger 560e48354ceSNicholas Bellinger pr_debug("Received Data ACK SNACK for ITT: 0x%08x," 561e48354ceSNicholas Bellinger " updated acked DataSN to 0x%08x.\n", 562e48354ceSNicholas Bellinger cmd->init_task_tag, cmd->acked_data_sn); 563e48354ceSNicholas Bellinger 564e48354ceSNicholas Bellinger return 0; 565e48354ceSNicholas Bellinger } 566e48354ceSNicholas Bellinger 567e48354ceSNicholas Bellinger static int iscsit_send_recovery_r2t( 568e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 569e48354ceSNicholas Bellinger u32 offset, 570e48354ceSNicholas Bellinger u32 xfer_len) 571e48354ceSNicholas Bellinger { 572e48354ceSNicholas Bellinger int ret; 573e48354ceSNicholas Bellinger 574e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 575e48354ceSNicholas Bellinger ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); 576e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 577e48354ceSNicholas Bellinger 578e48354ceSNicholas Bellinger return ret; 579e48354ceSNicholas Bellinger } 580e48354ceSNicholas Bellinger 581e48354ceSNicholas Bellinger int iscsit_dataout_datapduinorder_no_fbit( 582e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 583e48354ceSNicholas Bellinger struct iscsi_pdu *pdu) 584e48354ceSNicholas Bellinger { 585e48354ceSNicholas Bellinger int i, send_recovery_r2t = 0, recovery = 0; 586e48354ceSNicholas Bellinger u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; 587e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 588e48354ceSNicholas Bellinger struct iscsi_pdu *first_pdu = NULL; 589e48354ceSNicholas Bellinger 590e48354ceSNicholas Bellinger /* 591e48354ceSNicholas Bellinger * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count 592e48354ceSNicholas Bellinger * of the DataOUT sequence. 593e48354ceSNicholas Bellinger */ 594e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 595e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 596e48354ceSNicholas Bellinger if (cmd->pdu_list[i].seq_no == pdu->seq_no) { 597e48354ceSNicholas Bellinger if (!first_pdu) 598e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[i]; 599e48354ceSNicholas Bellinger xfer_len += cmd->pdu_list[i].length; 600e48354ceSNicholas Bellinger pdu_count++; 601e48354ceSNicholas Bellinger } else if (pdu_count) 602e48354ceSNicholas Bellinger break; 603e48354ceSNicholas Bellinger } 604e48354ceSNicholas Bellinger } else { 605e48354ceSNicholas Bellinger struct iscsi_seq *seq = cmd->seq_ptr; 606e48354ceSNicholas Bellinger 607e48354ceSNicholas Bellinger first_pdu = &cmd->pdu_list[seq->pdu_start]; 608e48354ceSNicholas Bellinger pdu_count = seq->pdu_count; 609e48354ceSNicholas Bellinger } 610e48354ceSNicholas Bellinger 611e48354ceSNicholas Bellinger if (!first_pdu || !pdu_count) 612e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 613e48354ceSNicholas Bellinger 614e48354ceSNicholas Bellinger /* 615e48354ceSNicholas Bellinger * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. 616e48354ceSNicholas Bellinger * The following ugly logic does batching of not received PDUs. 617e48354ceSNicholas Bellinger */ 618e48354ceSNicholas Bellinger for (i = 0; i < pdu_count; i++) { 619e48354ceSNicholas Bellinger if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { 620e48354ceSNicholas Bellinger if (!send_recovery_r2t) 621e48354ceSNicholas Bellinger continue; 622e48354ceSNicholas Bellinger 623e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 624e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 625e48354ceSNicholas Bellinger 626e48354ceSNicholas Bellinger send_recovery_r2t = length = offset = 0; 627e48354ceSNicholas Bellinger continue; 628e48354ceSNicholas Bellinger } 629e48354ceSNicholas Bellinger /* 630e48354ceSNicholas Bellinger * Set recovery = 1 for any missing, CRC failed, or timed 631e48354ceSNicholas Bellinger * out PDUs to let the DataOUT logic know that this sequence 632e48354ceSNicholas Bellinger * has not been completed yet. 633e48354ceSNicholas Bellinger * 634e48354ceSNicholas Bellinger * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. 635e48354ceSNicholas Bellinger * We assume if the PDU either failed CRC or timed out 636e48354ceSNicholas Bellinger * that a Recovery R2T has already been sent. 637e48354ceSNicholas Bellinger */ 638e48354ceSNicholas Bellinger recovery = 1; 639e48354ceSNicholas Bellinger 640e48354ceSNicholas Bellinger if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) 641e48354ceSNicholas Bellinger continue; 642e48354ceSNicholas Bellinger 643e48354ceSNicholas Bellinger if (!offset) 644e48354ceSNicholas Bellinger offset = first_pdu[i].offset; 645e48354ceSNicholas Bellinger length += first_pdu[i].length; 646e48354ceSNicholas Bellinger 647e48354ceSNicholas Bellinger send_recovery_r2t = 1; 648e48354ceSNicholas Bellinger } 649e48354ceSNicholas Bellinger 650e48354ceSNicholas Bellinger if (send_recovery_r2t) 651e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 652e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 653e48354ceSNicholas Bellinger 654e48354ceSNicholas Bellinger return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; 655e48354ceSNicholas Bellinger } 656e48354ceSNicholas Bellinger 657e48354ceSNicholas Bellinger static int iscsit_recalculate_dataout_values( 658e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 659e48354ceSNicholas Bellinger u32 pdu_offset, 660e48354ceSNicholas Bellinger u32 pdu_length, 661e48354ceSNicholas Bellinger u32 *r2t_offset, 662e48354ceSNicholas Bellinger u32 *r2t_length) 663e48354ceSNicholas Bellinger { 664e48354ceSNicholas Bellinger int i; 665e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 666e48354ceSNicholas Bellinger struct iscsi_pdu *pdu = NULL; 667e48354ceSNicholas Bellinger 668e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 669e48354ceSNicholas Bellinger cmd->data_sn = 0; 670e48354ceSNicholas Bellinger 671e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 672e48354ceSNicholas Bellinger *r2t_offset = cmd->write_data_done; 673e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - 674e48354ceSNicholas Bellinger cmd->write_data_done); 675e48354ceSNicholas Bellinger return 0; 676e48354ceSNicholas Bellinger } 677e48354ceSNicholas Bellinger 678e48354ceSNicholas Bellinger *r2t_offset = cmd->seq_start_offset; 679e48354ceSNicholas Bellinger *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); 680e48354ceSNicholas Bellinger 681e48354ceSNicholas Bellinger for (i = 0; i < cmd->pdu_count; i++) { 682e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i]; 683e48354ceSNicholas Bellinger 684e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 685e48354ceSNicholas Bellinger continue; 686e48354ceSNicholas Bellinger 687e48354ceSNicholas Bellinger if ((pdu->offset >= cmd->seq_start_offset) && 688e48354ceSNicholas Bellinger ((pdu->offset + pdu->length) <= 689e48354ceSNicholas Bellinger cmd->seq_end_offset)) { 690e48354ceSNicholas Bellinger if (!cmd->unsolicited_data) 691e48354ceSNicholas Bellinger cmd->next_burst_len -= pdu->length; 692e48354ceSNicholas Bellinger else 693e48354ceSNicholas Bellinger cmd->first_burst_len -= pdu->length; 694e48354ceSNicholas Bellinger 695e48354ceSNicholas Bellinger cmd->write_data_done -= pdu->length; 696e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 697e48354ceSNicholas Bellinger } 698e48354ceSNicholas Bellinger } 699e48354ceSNicholas Bellinger } else { 700e48354ceSNicholas Bellinger struct iscsi_seq *seq = NULL; 701e48354ceSNicholas Bellinger 702e48354ceSNicholas Bellinger seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); 703e48354ceSNicholas Bellinger if (!seq) 704e48354ceSNicholas Bellinger return -1; 705e48354ceSNicholas Bellinger 706e48354ceSNicholas Bellinger *r2t_offset = seq->orig_offset; 707e48354ceSNicholas Bellinger *r2t_length = seq->xfer_len; 708e48354ceSNicholas Bellinger 709e48354ceSNicholas Bellinger cmd->write_data_done -= (seq->offset - seq->orig_offset); 710e48354ceSNicholas Bellinger if (cmd->immediate_data) 711e48354ceSNicholas Bellinger cmd->first_burst_len = cmd->write_data_done; 712e48354ceSNicholas Bellinger 713e48354ceSNicholas Bellinger seq->data_sn = 0; 714e48354ceSNicholas Bellinger seq->offset = seq->orig_offset; 715e48354ceSNicholas Bellinger seq->next_burst_len = 0; 716e48354ceSNicholas Bellinger seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 717e48354ceSNicholas Bellinger 718e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) 719e48354ceSNicholas Bellinger return 0; 720e48354ceSNicholas Bellinger 721e48354ceSNicholas Bellinger for (i = 0; i < seq->pdu_count; i++) { 722e48354ceSNicholas Bellinger pdu = &cmd->pdu_list[i+seq->pdu_start]; 723e48354ceSNicholas Bellinger 724e48354ceSNicholas Bellinger if (pdu->status != ISCSI_PDU_RECEIVED_OK) 725e48354ceSNicholas Bellinger continue; 726e48354ceSNicholas Bellinger 727e48354ceSNicholas Bellinger pdu->status = ISCSI_PDU_NOT_RECEIVED; 728e48354ceSNicholas Bellinger } 729e48354ceSNicholas Bellinger } 730e48354ceSNicholas Bellinger 731e48354ceSNicholas Bellinger return 0; 732e48354ceSNicholas Bellinger } 733e48354ceSNicholas Bellinger 734e48354ceSNicholas Bellinger int iscsit_recover_dataout_sequence( 735e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 736e48354ceSNicholas Bellinger u32 pdu_offset, 737e48354ceSNicholas Bellinger u32 pdu_length) 738e48354ceSNicholas Bellinger { 739e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 740e48354ceSNicholas Bellinger 741e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 742e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 743e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 744e48354ceSNicholas Bellinger 745e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 746e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 747e48354ceSNicholas Bellinger return DATAOUT_CANNOT_RECOVER; 748e48354ceSNicholas Bellinger 749e48354ceSNicholas Bellinger iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); 750e48354ceSNicholas Bellinger 751e48354ceSNicholas Bellinger return DATAOUT_WITHIN_COMMAND_RECOVERY; 752e48354ceSNicholas Bellinger } 753e48354ceSNicholas Bellinger 754e48354ceSNicholas Bellinger static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) 755e48354ceSNicholas Bellinger { 756e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; 757e48354ceSNicholas Bellinger 758e48354ceSNicholas Bellinger ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); 759e48354ceSNicholas Bellinger if (!ooo_cmdsn) { 760e48354ceSNicholas Bellinger pr_err("Unable to allocate memory for" 761e48354ceSNicholas Bellinger " struct iscsi_ooo_cmdsn.\n"); 762e48354ceSNicholas Bellinger return NULL; 763e48354ceSNicholas Bellinger } 764e48354ceSNicholas Bellinger INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); 765e48354ceSNicholas Bellinger 766e48354ceSNicholas Bellinger return ooo_cmdsn; 767e48354ceSNicholas Bellinger } 768e48354ceSNicholas Bellinger 769e48354ceSNicholas Bellinger static int iscsit_attach_ooo_cmdsn( 770e48354ceSNicholas Bellinger struct iscsi_session *sess, 771e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 772e48354ceSNicholas Bellinger { 773e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; 774618baaf7SBart Van Assche 775618baaf7SBart Van Assche lockdep_assert_held(&sess->cmdsn_mutex); 776618baaf7SBart Van Assche 777e48354ceSNicholas Bellinger /* 778e48354ceSNicholas Bellinger * We attach the struct iscsi_ooo_cmdsn entry to the out of order 779e48354ceSNicholas Bellinger * list in increasing CmdSN order. 780e48354ceSNicholas Bellinger * This allows iscsi_execute_ooo_cmdsns() to detect any 781e48354ceSNicholas Bellinger * additional CmdSN holes while performing delayed execution. 782e48354ceSNicholas Bellinger */ 783e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 784e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 785e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 786e48354ceSNicholas Bellinger else { 787e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 788e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 789e48354ceSNicholas Bellinger /* 790e48354ceSNicholas Bellinger * CmdSN is greater than the tail of the list. 791e48354ceSNicholas Bellinger */ 7923eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) 793e48354ceSNicholas Bellinger list_add_tail(&ooo_cmdsn->ooo_list, 794e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list); 795e48354ceSNicholas Bellinger else { 796e48354ceSNicholas Bellinger /* 797e48354ceSNicholas Bellinger * CmdSN is either lower than the head, or somewhere 798e48354ceSNicholas Bellinger * in the middle. 799e48354ceSNicholas Bellinger */ 800e48354ceSNicholas Bellinger list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, 801e48354ceSNicholas Bellinger ooo_list) { 8023eccfdb0SShlomo Pongratz if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) 803e48354ceSNicholas Bellinger continue; 804e48354ceSNicholas Bellinger 8053eccfdb0SShlomo Pongratz /* Insert before this entry */ 806e48354ceSNicholas Bellinger list_add(&ooo_cmdsn->ooo_list, 8073eccfdb0SShlomo Pongratz ooo_tmp->ooo_list.prev); 808e48354ceSNicholas Bellinger break; 809e48354ceSNicholas Bellinger } 810e48354ceSNicholas Bellinger } 811e48354ceSNicholas Bellinger } 812e48354ceSNicholas Bellinger 813e48354ceSNicholas Bellinger return 0; 814e48354ceSNicholas Bellinger } 815e48354ceSNicholas Bellinger 816e48354ceSNicholas Bellinger /* 817e48354ceSNicholas Bellinger * Removes an struct iscsi_ooo_cmdsn from a session's list, 818e48354ceSNicholas Bellinger * called with struct iscsi_session->cmdsn_mutex held. 819e48354ceSNicholas Bellinger */ 820e48354ceSNicholas Bellinger void iscsit_remove_ooo_cmdsn( 821e48354ceSNicholas Bellinger struct iscsi_session *sess, 822e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn) 823e48354ceSNicholas Bellinger { 824e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 825e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 826e48354ceSNicholas Bellinger } 827e48354ceSNicholas Bellinger 828e48354ceSNicholas Bellinger void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) 829e48354ceSNicholas Bellinger { 830e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn; 831e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 832e48354ceSNicholas Bellinger 833e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 834e48354ceSNicholas Bellinger list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { 835e48354ceSNicholas Bellinger if (ooo_cmdsn->cid != conn->cid) 836e48354ceSNicholas Bellinger continue; 837e48354ceSNicholas Bellinger 838e48354ceSNicholas Bellinger ooo_cmdsn->cmd = NULL; 839e48354ceSNicholas Bellinger } 840e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 841e48354ceSNicholas Bellinger } 842e48354ceSNicholas Bellinger 843e48354ceSNicholas Bellinger int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) 844e48354ceSNicholas Bellinger { 845e48354ceSNicholas Bellinger int ooo_count = 0; 846e48354ceSNicholas Bellinger struct iscsi_cmd *cmd = NULL; 847e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 848e48354ceSNicholas Bellinger 849618baaf7SBart Van Assche lockdep_assert_held(&sess->cmdsn_mutex); 850618baaf7SBart Van Assche 851e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 852e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 853e48354ceSNicholas Bellinger if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) 854e48354ceSNicholas Bellinger continue; 855e48354ceSNicholas Bellinger 856e48354ceSNicholas Bellinger if (!ooo_cmdsn->cmd) { 857e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 858e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 859e48354ceSNicholas Bellinger continue; 860e48354ceSNicholas Bellinger } 861e48354ceSNicholas Bellinger 862e48354ceSNicholas Bellinger cmd = ooo_cmdsn->cmd; 863e48354ceSNicholas Bellinger cmd->i_state = cmd->deferred_i_state; 864e48354ceSNicholas Bellinger ooo_count++; 865e48354ceSNicholas Bellinger sess->exp_cmd_sn++; 866e48354ceSNicholas Bellinger pr_debug("Executing out of order CmdSN: 0x%08x," 867e48354ceSNicholas Bellinger " incremented ExpCmdSN to 0x%08x.\n", 868e48354ceSNicholas Bellinger cmd->cmd_sn, sess->exp_cmd_sn); 869e48354ceSNicholas Bellinger 870e48354ceSNicholas Bellinger iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 871e48354ceSNicholas Bellinger 872e48354ceSNicholas Bellinger if (iscsit_execute_cmd(cmd, 1) < 0) 873e48354ceSNicholas Bellinger return -1; 874e48354ceSNicholas Bellinger 875e48354ceSNicholas Bellinger continue; 876e48354ceSNicholas Bellinger } 877e48354ceSNicholas Bellinger 878e48354ceSNicholas Bellinger return ooo_count; 879e48354ceSNicholas Bellinger } 880e48354ceSNicholas Bellinger 881e48354ceSNicholas Bellinger /* 882e48354ceSNicholas Bellinger * Called either: 883e48354ceSNicholas Bellinger * 884e48354ceSNicholas Bellinger * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() 885e48354ceSNicholas Bellinger * or iscsi_check_received_cmdsn(). 886e48354ceSNicholas Bellinger * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions 887e48354ceSNicholas Bellinger * for immediate commands. 888e48354ceSNicholas Bellinger */ 889e48354ceSNicholas Bellinger int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) 890e48354ceSNicholas Bellinger { 891e48354ceSNicholas Bellinger struct se_cmd *se_cmd = &cmd->se_cmd; 8923e1c81a9SNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 893e48354ceSNicholas Bellinger int lr = 0; 894e48354ceSNicholas Bellinger 895e48354ceSNicholas Bellinger spin_lock_bh(&cmd->istate_lock); 896e48354ceSNicholas Bellinger if (ooo) 897e48354ceSNicholas Bellinger cmd->cmd_flags &= ~ICF_OOO_CMDSN; 898e48354ceSNicholas Bellinger 899e48354ceSNicholas Bellinger switch (cmd->iscsi_opcode) { 900e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_CMD: 901e48354ceSNicholas Bellinger /* 902e48354ceSNicholas Bellinger * Go ahead and send the CHECK_CONDITION status for 903de103c93SChristoph Hellwig * any SCSI CDB exceptions that may have occurred. 904e48354ceSNicholas Bellinger */ 905de103c93SChristoph Hellwig if (cmd->sense_reason) { 906de103c93SChristoph Hellwig if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { 907e48354ceSNicholas Bellinger cmd->i_state = ISTATE_SEND_STATUS; 908e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 909e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 910e48354ceSNicholas Bellinger cmd->i_state); 911e48354ceSNicholas Bellinger return 0; 912e48354ceSNicholas Bellinger } 913e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 914aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 915e48354ceSNicholas Bellinger return 0; 916e48354ceSNicholas Bellinger return transport_send_check_condition_and_sense(se_cmd, 917de103c93SChristoph Hellwig cmd->sense_reason, 0); 918e48354ceSNicholas Bellinger } 919e48354ceSNicholas Bellinger /* 920e48354ceSNicholas Bellinger * Special case for delayed CmdSN with Immediate 921e48354ceSNicholas Bellinger * Data and/or Unsolicited Data Out attached. 922e48354ceSNicholas Bellinger */ 923e48354ceSNicholas Bellinger if (cmd->immediate_data) { 924e48354ceSNicholas Bellinger if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 925e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 92667441b68SChristoph Hellwig target_execute_cmd(&cmd->se_cmd); 92767441b68SChristoph Hellwig return 0; 928e48354ceSNicholas Bellinger } 929e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 930e48354ceSNicholas Bellinger 931e48354ceSNicholas Bellinger if (!(cmd->cmd_flags & 932e48354ceSNicholas Bellinger ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 933aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 934e48354ceSNicholas Bellinger return 0; 935e48354ceSNicholas Bellinger 936e48354ceSNicholas Bellinger iscsit_set_dataout_sequence_values(cmd); 9373e1c81a9SNicholas Bellinger conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 938e48354ceSNicholas Bellinger } 939e48354ceSNicholas Bellinger return 0; 940e48354ceSNicholas Bellinger } 941e48354ceSNicholas Bellinger /* 942e48354ceSNicholas Bellinger * The default handler. 943e48354ceSNicholas Bellinger */ 944e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 945e48354ceSNicholas Bellinger 946e48354ceSNicholas Bellinger if ((cmd->data_direction == DMA_TO_DEVICE) && 947e48354ceSNicholas Bellinger !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 948aaa00cc9SBart Van Assche if (cmd->se_cmd.transport_state & CMD_T_ABORTED) 949e48354ceSNicholas Bellinger return 0; 950e48354ceSNicholas Bellinger 9510300b114SBart Van Assche iscsit_set_unsolicited_dataout(cmd); 952e48354ceSNicholas Bellinger } 953e48354ceSNicholas Bellinger return transport_handle_cdb_direct(&cmd->se_cmd); 954e48354ceSNicholas Bellinger 955e48354ceSNicholas Bellinger case ISCSI_OP_NOOP_OUT: 956e48354ceSNicholas Bellinger case ISCSI_OP_TEXT: 957e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 958e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 959e48354ceSNicholas Bellinger break; 960e48354ceSNicholas Bellinger case ISCSI_OP_SCSI_TMFUNC: 961de103c93SChristoph Hellwig if (cmd->se_cmd.se_tmr_req->response) { 962e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 963e48354ceSNicholas Bellinger iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 964e48354ceSNicholas Bellinger cmd->i_state); 965e48354ceSNicholas Bellinger return 0; 966e48354ceSNicholas Bellinger } 967e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 968e48354ceSNicholas Bellinger 969e48354ceSNicholas Bellinger return transport_generic_handle_tmr(&cmd->se_cmd); 970e48354ceSNicholas Bellinger case ISCSI_OP_LOGOUT: 971e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 972e48354ceSNicholas Bellinger switch (cmd->logout_reason) { 973e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 974e48354ceSNicholas Bellinger lr = iscsit_logout_closesession(cmd, cmd->conn); 975e48354ceSNicholas Bellinger break; 976e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 977e48354ceSNicholas Bellinger lr = iscsit_logout_closeconnection(cmd, cmd->conn); 978e48354ceSNicholas Bellinger break; 979e48354ceSNicholas Bellinger case ISCSI_LOGOUT_REASON_RECOVERY: 980e48354ceSNicholas Bellinger lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); 981e48354ceSNicholas Bellinger break; 982e48354ceSNicholas Bellinger default: 983e48354ceSNicholas Bellinger pr_err("Unknown iSCSI Logout Request Code:" 984e48354ceSNicholas Bellinger " 0x%02x\n", cmd->logout_reason); 985e48354ceSNicholas Bellinger return -1; 986e48354ceSNicholas Bellinger } 987e48354ceSNicholas Bellinger 988e48354ceSNicholas Bellinger return lr; 989e48354ceSNicholas Bellinger default: 990e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->istate_lock); 991e48354ceSNicholas Bellinger pr_err("Cannot perform out of order execution for" 992e48354ceSNicholas Bellinger " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); 993e48354ceSNicholas Bellinger return -1; 994e48354ceSNicholas Bellinger } 995e48354ceSNicholas Bellinger 996e48354ceSNicholas Bellinger return 0; 997e48354ceSNicholas Bellinger } 998e48354ceSNicholas Bellinger 999e48354ceSNicholas Bellinger void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) 1000e48354ceSNicholas Bellinger { 1001e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 1002e48354ceSNicholas Bellinger 1003e48354ceSNicholas Bellinger mutex_lock(&sess->cmdsn_mutex); 1004e48354ceSNicholas Bellinger list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 1005e48354ceSNicholas Bellinger &sess->sess_ooo_cmdsn_list, ooo_list) { 1006e48354ceSNicholas Bellinger 1007e48354ceSNicholas Bellinger list_del(&ooo_cmdsn->ooo_list); 1008e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1009e48354ceSNicholas Bellinger } 1010e48354ceSNicholas Bellinger mutex_unlock(&sess->cmdsn_mutex); 1011e48354ceSNicholas Bellinger } 1012e48354ceSNicholas Bellinger 1013e48354ceSNicholas Bellinger int iscsit_handle_ooo_cmdsn( 1014e48354ceSNicholas Bellinger struct iscsi_session *sess, 1015e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1016e48354ceSNicholas Bellinger u32 cmdsn) 1017e48354ceSNicholas Bellinger { 1018e48354ceSNicholas Bellinger int batch = 0; 1019e48354ceSNicholas Bellinger struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; 1020e48354ceSNicholas Bellinger 1021e48354ceSNicholas Bellinger cmd->deferred_i_state = cmd->i_state; 1022e48354ceSNicholas Bellinger cmd->i_state = ISTATE_DEFERRED_CMD; 1023e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_OOO_CMDSN; 1024e48354ceSNicholas Bellinger 1025e48354ceSNicholas Bellinger if (list_empty(&sess->sess_ooo_cmdsn_list)) 1026e48354ceSNicholas Bellinger batch = 1; 1027e48354ceSNicholas Bellinger else { 1028e48354ceSNicholas Bellinger ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 1029e48354ceSNicholas Bellinger typeof(*ooo_tail), ooo_list); 1030e48354ceSNicholas Bellinger if (ooo_tail->cmdsn != (cmdsn - 1)) 1031e48354ceSNicholas Bellinger batch = 1; 1032e48354ceSNicholas Bellinger } 1033e48354ceSNicholas Bellinger 1034e48354ceSNicholas Bellinger ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); 1035e48354ceSNicholas Bellinger if (!ooo_cmdsn) 1036561bf158SNicholas Bellinger return -ENOMEM; 1037e48354ceSNicholas Bellinger 1038e48354ceSNicholas Bellinger ooo_cmdsn->cmd = cmd; 1039e48354ceSNicholas Bellinger ooo_cmdsn->batch_count = (batch) ? 1040e48354ceSNicholas Bellinger (cmdsn - sess->exp_cmd_sn) : 1; 1041e48354ceSNicholas Bellinger ooo_cmdsn->cid = cmd->conn->cid; 1042e48354ceSNicholas Bellinger ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; 1043e48354ceSNicholas Bellinger ooo_cmdsn->cmdsn = cmdsn; 1044e48354ceSNicholas Bellinger 1045e48354ceSNicholas Bellinger if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { 1046e48354ceSNicholas Bellinger kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1047561bf158SNicholas Bellinger return -ENOMEM; 1048e48354ceSNicholas Bellinger } 1049e48354ceSNicholas Bellinger 1050561bf158SNicholas Bellinger return 0; 1051e48354ceSNicholas Bellinger } 1052e48354ceSNicholas Bellinger 1053e48354ceSNicholas Bellinger static int iscsit_set_dataout_timeout_values( 1054e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1055e48354ceSNicholas Bellinger u32 *offset, 1056e48354ceSNicholas Bellinger u32 *length) 1057e48354ceSNicholas Bellinger { 1058e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1059e48354ceSNicholas Bellinger struct iscsi_r2t *r2t; 1060e48354ceSNicholas Bellinger 1061e48354ceSNicholas Bellinger if (cmd->unsolicited_data) { 1062e48354ceSNicholas Bellinger *offset = 0; 1063e48354ceSNicholas Bellinger *length = (conn->sess->sess_ops->FirstBurstLength > 1064ebf1d95cSAndy Grover cmd->se_cmd.data_length) ? 1065ebf1d95cSAndy Grover cmd->se_cmd.data_length : 1066e48354ceSNicholas Bellinger conn->sess->sess_ops->FirstBurstLength; 1067e48354ceSNicholas Bellinger return 0; 1068e48354ceSNicholas Bellinger } 1069e48354ceSNicholas Bellinger 1070e48354ceSNicholas Bellinger spin_lock_bh(&cmd->r2t_lock); 1071e48354ceSNicholas Bellinger if (list_empty(&cmd->cmd_r2t_list)) { 1072e48354ceSNicholas Bellinger pr_err("cmd->cmd_r2t_list is empty!\n"); 1073e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1074e48354ceSNicholas Bellinger return -1; 1075e48354ceSNicholas Bellinger } 1076e48354ceSNicholas Bellinger 1077e48354ceSNicholas Bellinger list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 1078e48354ceSNicholas Bellinger if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { 1079e48354ceSNicholas Bellinger *offset = r2t->offset; 1080e48354ceSNicholas Bellinger *length = r2t->xfer_len; 1081e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1082e48354ceSNicholas Bellinger return 0; 1083e48354ceSNicholas Bellinger } 1084e48354ceSNicholas Bellinger } 1085e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->r2t_lock); 1086e48354ceSNicholas Bellinger 1087e48354ceSNicholas Bellinger pr_err("Unable to locate any incomplete DataOUT" 1088e48354ceSNicholas Bellinger " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); 1089e48354ceSNicholas Bellinger 1090e48354ceSNicholas Bellinger return -1; 1091e48354ceSNicholas Bellinger } 1092e48354ceSNicholas Bellinger 1093e48354ceSNicholas Bellinger /* 1094e48354ceSNicholas Bellinger * NOTE: Called from interrupt (timer) context. 1095e48354ceSNicholas Bellinger */ 1096f7c9564aSKees Cook void iscsit_handle_dataout_timeout(struct timer_list *t) 1097e48354ceSNicholas Bellinger { 1098e48354ceSNicholas Bellinger u32 pdu_length = 0, pdu_offset = 0; 1099e48354ceSNicholas Bellinger u32 r2t_length = 0, r2t_offset = 0; 1100f7c9564aSKees Cook struct iscsi_cmd *cmd = from_timer(cmd, t, dataout_timer); 1101e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1102e48354ceSNicholas Bellinger struct iscsi_session *sess = NULL; 1103e48354ceSNicholas Bellinger struct iscsi_node_attrib *na; 1104e48354ceSNicholas Bellinger 1105e48354ceSNicholas Bellinger iscsit_inc_conn_usage_count(conn); 1106e48354ceSNicholas Bellinger 1107e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1108e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { 1109e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1110e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1111e48354ceSNicholas Bellinger return; 1112e48354ceSNicholas Bellinger } 1113e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1114e48354ceSNicholas Bellinger sess = conn->sess; 1115e48354ceSNicholas Bellinger na = iscsit_tpg_get_node_attrib(sess); 1116e48354ceSNicholas Bellinger 1117e48354ceSNicholas Bellinger if (!sess->sess_ops->ErrorRecoveryLevel) { 1118d9a771fdSDavid Disseldorp pr_err("Unable to recover from DataOut timeout while" 1119d9a771fdSDavid Disseldorp " in ERL=0, closing iSCSI connection for I_T Nexus" 1120d9a771fdSDavid Disseldorp " %s,i,0x%6phN,%s,t,0x%02x\n", 1121d9a771fdSDavid Disseldorp sess->sess_ops->InitiatorName, sess->isid, 1122d9a771fdSDavid Disseldorp sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); 1123e48354ceSNicholas Bellinger goto failure; 1124e48354ceSNicholas Bellinger } 1125e48354ceSNicholas Bellinger 1126e48354ceSNicholas Bellinger if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { 1127d9a771fdSDavid Disseldorp pr_err("Command ITT: 0x%08x exceeded max retries" 1128d9a771fdSDavid Disseldorp " for DataOUT timeout %u, closing iSCSI connection for" 1129d9a771fdSDavid Disseldorp " I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n", 1130d9a771fdSDavid Disseldorp cmd->init_task_tag, na->dataout_timeout_retries, 1131d9a771fdSDavid Disseldorp sess->sess_ops->InitiatorName, sess->isid, 1132d9a771fdSDavid Disseldorp sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); 1133e48354ceSNicholas Bellinger goto failure; 1134e48354ceSNicholas Bellinger } 1135e48354ceSNicholas Bellinger 1136e48354ceSNicholas Bellinger cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 1137e48354ceSNicholas Bellinger 1138e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataSequenceInOrder) { 1139e48354ceSNicholas Bellinger if (conn->sess->sess_ops->DataPDUInOrder) { 1140e48354ceSNicholas Bellinger pdu_offset = cmd->write_data_done; 1141e48354ceSNicholas Bellinger if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - 1142ebf1d95cSAndy Grover cmd->next_burst_len)) > cmd->se_cmd.data_length) 1143ebf1d95cSAndy Grover pdu_length = (cmd->se_cmd.data_length - 1144e48354ceSNicholas Bellinger cmd->write_data_done); 1145e48354ceSNicholas Bellinger else 1146e48354ceSNicholas Bellinger pdu_length = (conn->sess->sess_ops->MaxBurstLength - 1147e48354ceSNicholas Bellinger cmd->next_burst_len); 1148e48354ceSNicholas Bellinger } else { 1149e48354ceSNicholas Bellinger pdu_offset = cmd->seq_start_offset; 1150e48354ceSNicholas Bellinger pdu_length = (cmd->seq_end_offset - 1151e48354ceSNicholas Bellinger cmd->seq_start_offset); 1152e48354ceSNicholas Bellinger } 1153e48354ceSNicholas Bellinger } else { 1154e48354ceSNicholas Bellinger if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, 1155e48354ceSNicholas Bellinger &pdu_length) < 0) 1156e48354ceSNicholas Bellinger goto failure; 1157e48354ceSNicholas Bellinger } 1158e48354ceSNicholas Bellinger 1159e48354ceSNicholas Bellinger if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 1160e48354ceSNicholas Bellinger &r2t_offset, &r2t_length) < 0) 1161e48354ceSNicholas Bellinger goto failure; 1162e48354ceSNicholas Bellinger 1163e48354ceSNicholas Bellinger pr_debug("Command ITT: 0x%08x timed out waiting for" 1164e48354ceSNicholas Bellinger " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", 1165e48354ceSNicholas Bellinger cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : 1166e48354ceSNicholas Bellinger "", r2t_offset, r2t_length); 1167e48354ceSNicholas Bellinger 1168e48354ceSNicholas Bellinger if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) 1169e48354ceSNicholas Bellinger goto failure; 1170e48354ceSNicholas Bellinger 1171e48354ceSNicholas Bellinger iscsit_start_dataout_timer(cmd, conn); 1172e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1173e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1174e48354ceSNicholas Bellinger 1175e48354ceSNicholas Bellinger return; 1176e48354ceSNicholas Bellinger 1177e48354ceSNicholas Bellinger failure: 1178e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 117933b3f8caSDavid Disseldorp iscsit_fill_cxn_timeout_err_stats(sess); 1180e48354ceSNicholas Bellinger iscsit_cause_connection_reinstatement(conn, 0); 1181e48354ceSNicholas Bellinger iscsit_dec_conn_usage_count(conn); 1182e48354ceSNicholas Bellinger } 1183e48354ceSNicholas Bellinger 1184e48354ceSNicholas Bellinger void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) 1185e48354ceSNicholas Bellinger { 1186e48354ceSNicholas Bellinger struct iscsi_conn *conn = cmd->conn; 1187e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1188e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1189e48354ceSNicholas Bellinger 1190e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1191e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1192e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1193e48354ceSNicholas Bellinger return; 1194e48354ceSNicholas Bellinger } 1195e48354ceSNicholas Bellinger 1196e48354ceSNicholas Bellinger mod_timer(&cmd->dataout_timer, 1197e48354ceSNicholas Bellinger (get_jiffies_64() + na->dataout_timeout * HZ)); 1198e48354ceSNicholas Bellinger pr_debug("Updated DataOUT timer for ITT: 0x%08x", 1199e48354ceSNicholas Bellinger cmd->init_task_tag); 1200e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1201e48354ceSNicholas Bellinger } 1202e48354ceSNicholas Bellinger 1203e48354ceSNicholas Bellinger void iscsit_start_dataout_timer( 1204e48354ceSNicholas Bellinger struct iscsi_cmd *cmd, 1205e48354ceSNicholas Bellinger struct iscsi_conn *conn) 1206e48354ceSNicholas Bellinger { 1207e48354ceSNicholas Bellinger struct iscsi_session *sess = conn->sess; 1208e8904dc5SJesper Juhl struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1209e48354ceSNicholas Bellinger 1210618baaf7SBart Van Assche lockdep_assert_held(&cmd->dataout_timeout_lock); 1211618baaf7SBart Van Assche 1212e48354ceSNicholas Bellinger if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) 1213e48354ceSNicholas Bellinger return; 1214e48354ceSNicholas Bellinger 1215e48354ceSNicholas Bellinger pr_debug("Starting DataOUT timer for ITT: 0x%08x on" 1216e48354ceSNicholas Bellinger " CID: %hu.\n", cmd->init_task_tag, conn->cid); 1217e48354ceSNicholas Bellinger 1218e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; 1219e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; 12208a47aa9dSBart Van Assche mod_timer(&cmd->dataout_timer, jiffies + na->dataout_timeout * HZ); 1221e48354ceSNicholas Bellinger } 1222e48354ceSNicholas Bellinger 1223e48354ceSNicholas Bellinger void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) 1224e48354ceSNicholas Bellinger { 1225e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1226e48354ceSNicholas Bellinger if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1227e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1228e48354ceSNicholas Bellinger return; 1229e48354ceSNicholas Bellinger } 1230e48354ceSNicholas Bellinger cmd->dataout_timer_flags |= ISCSI_TF_STOP; 1231e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1232e48354ceSNicholas Bellinger 1233e48354ceSNicholas Bellinger del_timer_sync(&cmd->dataout_timer); 1234e48354ceSNicholas Bellinger 1235e48354ceSNicholas Bellinger spin_lock_bh(&cmd->dataout_timeout_lock); 1236e48354ceSNicholas Bellinger cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1237e48354ceSNicholas Bellinger pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", 1238e48354ceSNicholas Bellinger cmd->init_task_tag); 1239e48354ceSNicholas Bellinger spin_unlock_bh(&cmd->dataout_timeout_lock); 1240e48354ceSNicholas Bellinger } 12413e1c81a9SNicholas Bellinger EXPORT_SYMBOL(iscsit_stop_dataout_timer); 1242