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3c48aea225ce14c65a224d1d3fdd489249c6a31d
libiscsi/lib/pdu.c
Ronnie Sahlberg 3c48aea225 Add initial multithreading support and example 
This is the basic support for doing i/o in a separate worker thread.
It is still not threads safe but a start.
Now we need to protect all variables such as outqueue, waitpdu
and friends.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
2025-04-26 08:56:16 +10:00

1015 lines
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/*
Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#else
#define PRIu64 "llu"
#define PRIx32 "x"
#endif
#if defined(_WIN32)
#include <winsock2.h>
#include <ws2tcpip.h>
#include "win32/win32_compat.h"
#else
#include <strings.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "iscsi.h"
#include "iscsi-private.h"
#include "scsi-lowlevel.h"
#include "slist.h"
#include "utils.h"
/* This adds 32-bit serial comparision as defined in RFC1982.
* It returns 0 for equality, 1 if s1 is greater than s2 and
* -1 if s1 is less than s2. According to RFC1982 section 3.2
* there are rare cases where the result of the comparision is
* undefined e.g. when s1 = 0 and s2=2^31. This cases should
* not happen in iSCSI protocol.
*/
int
iscsi_serial32_compare(uint32_t s1, uint32_t s2) {
if (s1 == s2) return 0;
if (s1 < s2 && s2-s1 < (uint32_t)1<<31) return -1;
if (s1 > s2 && s1-s2 < (uint32_t)1<<31) return 1;
if (s1 > s2 && s1-s2 > (uint32_t)1<<31) return -1;
if (s1 < s2 && s2-s1 > (uint32_t)1<<31) return 1;
/* undefined result */
return -1;
}
uint32_t
iscsi_itt_post_increment(struct iscsi_context *iscsi) {
uint32_t old_itt = iscsi->itt;
iscsi->itt++;
/* 0xffffffff is a reserved value */
if (iscsi->itt == 0xffffffff) {
iscsi->itt = 0;
}
return old_itt;
}
static const char *
iscsi_opcode_str(int opcode)
{
static struct iscsi_value_string opcode_strings[] = {
{ ISCSI_PDU_NOP_OUT,
"NOP_OUT" },
{ ISCSI_PDU_SCSI_REQUEST,
"SCSI_REQUEST" },
{ ISCSI_PDU_SCSI_TASK_MANAGEMENT_REQUEST,
"SCSI_TASK_MANAGEMENT_REQUEST" },
{ ISCSI_PDU_LOGIN_REQUEST,
"LOGIN_REQUEST" },
{ ISCSI_PDU_TEXT_REQUEST,
"TEXT_REQUEST" },
{ ISCSI_PDU_DATA_OUT,
"DATA_OUT" },
{ ISCSI_PDU_LOGOUT_REQUEST,
"LOGOUT_REQUEST" },
{ ISCSI_PDU_NOP_IN,
"NOP_IN" },
{ ISCSI_PDU_SCSI_RESPONSE,
"SCSI_RESPONSE" },
{ ISCSI_PDU_SCSI_TASK_MANAGEMENT_RESPONSE,
"SCSI_TASK_MANAGEMENT_RESPONSE" },
{ ISCSI_PDU_LOGIN_RESPONSE,
"LOGIN_RESPONSE" },
{ ISCSI_PDU_TEXT_RESPONSE,
"TEXT_RESPONSE" },
{ ISCSI_PDU_DATA_IN,
"DATA_IN" },
{ ISCSI_PDU_LOGOUT_RESPONSE,
"LOGOUT_RESPONSE" },
{ ISCSI_PDU_R2T,
"R2T" },
{ ISCSI_PDU_ASYNC_MSG,
"ASYNC_MSG" },
{ ISCSI_PDU_REJECT,
"REJECT" },
{ ISCSI_PDU_NO_PDU,
"NO_PDU" },
{0, NULL}
};
return iscsi_value_string_find(opcode_strings, opcode, "UNKNOWN");
}
void iscsi_dump_pdu_header(struct iscsi_context *iscsi, unsigned char *data) {
char output[1024] = { 0 };
unsigned char iscsi_opcode;
const char *iscsi_opcode_string;
size_t output_off = 0;
int data_off = 0;
/* start to dump iSCSI opcode - data[0] */
iscsi_opcode = data[data_off];
iscsi_opcode_string = iscsi_opcode_str(iscsi_opcode);
output_off += snprintf(&output[output_off], sizeof(output) - output_off - 1, "%02x[%s]",
iscsi_opcode, iscsi_opcode_string);
data_off++;
if (iscsi_opcode == ISCSI_PDU_SCSI_REQUEST) {
unsigned char scsi_opcode;
const char *scsi_opcode_string;
/* the rest iSCSI PDU: data[1] - data[31] */
for ( ; data_off < 32; data_off++) {
if (sizeof(output) - 1 > output_off) {
output_off += snprintf(&output[output_off], sizeof(output) - output_off - 1,
" %02x", data[data_off]);
}
}
/* SCSI opcode: data[32] */
scsi_opcode = data[data_off];
scsi_opcode_string = scsi_opcode_str(scsi_opcode);
if (sizeof(output) - 1 > output_off) {
output_off += snprintf(&output[output_off], sizeof(output) - output_off - 1,
" %02x[%s]", scsi_opcode, scsi_opcode_string);
data_off++;
}
/* the rest SCSI PDU: data[33] - data[ISCSI_RAW_HEADER_SIZE - 1] */
for ( ; data_off < ISCSI_RAW_HEADER_SIZE; data_off++) {
if (sizeof(output) - 1 > output_off) {
output_off += snprintf(&output[output_off], sizeof(output) - output_off - 1,
" %02x", data[data_off]);
}
}
} else {
/* the rest iSCSI PDU: data[1] - data[ISCSI_RAW_HEADER_SIZE - 1] */
for ( ; data_off < ISCSI_RAW_HEADER_SIZE; data_off++) {
if (sizeof(output) - 1 > output_off) {
output_off += snprintf(&output[output_off], sizeof(output) - output_off - 1,
" %02x", data[data_off]);
}
}
}
ISCSI_LOG(iscsi, 2, "PDU header: %s", output);
}
struct iscsi_pdu*
iscsi_tcp_new_pdu(struct iscsi_context *iscsi, size_t size)
{
return iscsi_szmalloc(iscsi, size);
}
struct iscsi_pdu *
iscsi_allocate_pdu(struct iscsi_context *iscsi, enum iscsi_opcode opcode,
enum iscsi_opcode response_opcode, uint32_t itt,
uint32_t flags)
{
struct iscsi_pdu *pdu;
pdu = iscsi->drv->new_pdu(iscsi, sizeof(struct iscsi_pdu));
if (pdu == NULL) {
iscsi_set_error(iscsi, "failed to allocate pdu");
return NULL;
}
pdu->outdata.size = ISCSI_HEADER_SIZE(iscsi->header_digest);
pdu->outdata.data = iscsi_szmalloc(iscsi, pdu->outdata.size);
if (pdu->outdata.data == NULL) {
iscsi_set_error(iscsi, "failed to allocate pdu header");
iscsi->drv->free_pdu(iscsi, pdu);
return NULL;
}
/* opcode */
pdu->outdata.data[0] = opcode;
pdu->response_opcode = response_opcode;
/* isid */
if (opcode == ISCSI_PDU_LOGIN_REQUEST) {
memcpy(&pdu->outdata.data[8], &iscsi->isid[0], 6);
}
/* itt */
iscsi_pdu_set_itt(pdu, itt);
pdu->itt = itt;
/* flags */
pdu->flags = flags;
/* DataDigest - may or may not be calculated. Initialize anyway. */
crc32c_init(&pdu->calculated_data_digest);
return pdu;
}
void
iscsi_tcp_free_pdu(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
if (pdu == NULL) {
iscsi_set_error(iscsi, "trying to free NULL pdu");
return;
}
if (pdu->outdata.size <= iscsi->smalloc_size) {
iscsi_sfree(iscsi, pdu->outdata.data);
} else {
iscsi_free(iscsi, pdu->outdata.data);
}
pdu->outdata.data = NULL;
if (pdu->indata.size <= iscsi->smalloc_size) {
iscsi_sfree(iscsi, pdu->indata.data);
} else {
iscsi_free(iscsi, pdu->indata.data);
}
pdu->indata.data = NULL;
if (iscsi->outqueue_current == pdu) {
iscsi->outqueue_current = NULL;
}
iscsi_sfree(iscsi, pdu);
}
int
iscsi_add_data(struct iscsi_context *iscsi, struct iscsi_data *data,
const unsigned char *dptr, int dsize, int pdualignment)
{
size_t len, aligned;
if (dsize == 0) {
iscsi_set_error(iscsi, "Trying to append zero size data to "
"iscsi_data");
return -1;
}
len = data->size + dsize;
aligned = len;
if (pdualignment) {
aligned = (aligned+3)&0xfffffffc;
}
if (data->size == 0) {
if (aligned <= iscsi->smalloc_size) {
data->data = iscsi_szmalloc(iscsi, aligned);
} else {
data->data = iscsi_malloc(iscsi, aligned);
}
} else {
if (aligned > iscsi->smalloc_size) {
data->data = iscsi_realloc(iscsi, data->data, aligned);
}
}
if (data->data == NULL) {
iscsi_set_error(iscsi, "failed to allocate buffer for %d "
"bytes", (int) len);
return -1;
}
memcpy(data->data + data->size, dptr, dsize);
data->size += dsize;
if (len != aligned) {
/* zero out any padding at the end */
memset(data->data + len, 0, aligned - len);
}
return 0;
}
int
iscsi_pdu_add_data(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
const unsigned char *dptr, int dsize)
{
if (pdu == NULL) {
iscsi_set_error(iscsi, "trying to add data to NULL pdu");
return -1;
}
if (dsize == 0) {
iscsi_set_error(iscsi, "Trying to append zero size data to "
"pdu");
return -1;
}
if (iscsi_add_data(iscsi, &pdu->outdata, dptr, dsize, 1) != 0) {
iscsi_set_error(iscsi, "failed to add data to pdu buffer");
return -1;
}
/* update data segment length */
scsi_set_uint32(&pdu->outdata.data[4], pdu->outdata.size
- ISCSI_HEADER_SIZE(iscsi->header_digest));
return 0;
}
int
iscsi_get_pdu_data_size(const unsigned char *hdr)
{
int size;
size = scsi_get_uint32(&hdr[4]) & 0x00ffffff;
return size;
}
int
iscsi_get_pdu_padding_size(const unsigned char *hdr)
{
int data_size, padded_size;
data_size = scsi_get_uint32(&hdr[4]) & 0x00ffffff;
padded_size = (data_size+3) & 0xfffffffc;
return padded_size - data_size;
}
enum iscsi_reject_reason {
ISCSI_REJECT_RESERVED = 0x01,
ISCSI_REJECT_DATA_DIGEST_ERROR = 0x02,
ISCSI_REJECT_SNACK_REJECT = 0x03,
ISCSI_REJECT_PROTOCOL_ERROR = 0x04,
ISCSI_REJECT_COMMAND_NOT_SUPPORTED = 0x05,
ISCSI_REJECT_IMMEDIATE_COMMAND_REJECT = 0x06,
ISCSI_REJECT_TASK_IN_PROCESS = 0x07,
ISCSI_REJECT_INVALID_DATA_ACK = 0x08,
ISCSI_REJECT_INVALID_PDU_FIELD = 0x09,
ISCSI_REJECT_LONG_OPERATION_REJECT = 0x0a,
ISCSI_REJECT_NEGOTIATION_RESET = 0x0b,
ISCSI_REJECT_WAITING_FOR_LOGOUT = 0x0c
};
static const char *iscsi_reject_reason_str(enum iscsi_reject_reason reason)
{
switch (reason) {
case ISCSI_REJECT_RESERVED:
return "Reserved";
case ISCSI_REJECT_DATA_DIGEST_ERROR:
return "Data Digest Error";
case ISCSI_REJECT_SNACK_REJECT:
return "SNACK Reject";
case ISCSI_REJECT_PROTOCOL_ERROR:
return "Protocol Error";
case ISCSI_REJECT_COMMAND_NOT_SUPPORTED:
return "Command Not Supported";
case ISCSI_REJECT_IMMEDIATE_COMMAND_REJECT:
return "Immediate Command Reject";
case ISCSI_REJECT_TASK_IN_PROCESS:
return "Task In Process";
case ISCSI_REJECT_INVALID_DATA_ACK:
return "Invalid Data ACK";
case ISCSI_REJECT_INVALID_PDU_FIELD:
return "Invalid PDU Field";
case ISCSI_REJECT_LONG_OPERATION_REJECT:
return "Long Operation Reject";
case ISCSI_REJECT_NEGOTIATION_RESET:
return "Negotiation Reset";
case ISCSI_REJECT_WAITING_FOR_LOGOUT:
return "Waiting For Logout";
}
return "Unknown";
}
int iscsi_process_target_nop_in(struct iscsi_context *iscsi,
struct iscsi_in_pdu *in)
{
uint32_t ttt = scsi_get_uint32(&in->hdr[20]);
uint32_t itt = scsi_get_uint32(&in->hdr[16]);
uint32_t lun = scsi_get_uint16(&in->hdr[8]);
ISCSI_LOG(iscsi, (iscsi->nops_in_flight > 1) ? 1 : 6,
"NOP-In received (pdu->itt %08x, pdu->ttt %08x, pdu->lun %8x, iscsi->maxcmdsn %08x, iscsi->expcmdsn %08x, iscsi->statsn %08x)",
itt, ttt, lun, iscsi->maxcmdsn, iscsi->expcmdsn, iscsi->statsn);
/* if the server does not want a response */
if (ttt == 0xffffffff) {
return 0;
}
iscsi_send_target_nop_out(iscsi, ttt, lun);
return 0;
}
static void iscsi_reconnect_after_logout(struct iscsi_context *iscsi, int status,
void *command_data, void *opaque)
{
if (status) {
ISCSI_LOG(iscsi, 1, "logout failed: %s", iscsi_get_error(iscsi));
}
iscsi->pending_reconnect = 1;
}
int iscsi_process_reject(struct iscsi_context *iscsi,
struct iscsi_in_pdu *in)
{
int size = in->data_pos;
uint32_t itt;
struct iscsi_pdu *pdu;
uint8_t reason = in->hdr[2];
if (size < ISCSI_RAW_HEADER_SIZE) {
iscsi_set_error(iscsi, "size of REJECT payload is too small."
"Need >= %d bytes but got %d.",
ISCSI_RAW_HEADER_SIZE, (int)size);
return -1;
}
if (reason == ISCSI_REJECT_WAITING_FOR_LOGOUT) {
ISCSI_LOG(iscsi, 1, "target rejects request with reason: %s", iscsi_reject_reason_str(reason));
iscsi_logout_async(iscsi, iscsi_reconnect_after_logout, NULL);
return 0;
}
iscsi_set_error(iscsi, "Request was rejected with reason: 0x%02x (%s)", reason, iscsi_reject_reason_str(reason));
itt = scsi_get_uint32(&in->data[16]);
iscsi_dump_pdu_header(iscsi, in->data);
for (pdu = iscsi->waitpdu; pdu; pdu = pdu->next) {
if (pdu->itt == itt) {
break;
}
}
if (pdu == NULL) {
iscsi_set_error(iscsi, "Can not match REJECT with"
"any outstanding pdu with itt:0x%08x",
itt);
return -1;
}
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
return 0;
}
static void iscsi_process_pdu_serials(struct iscsi_context *iscsi, struct iscsi_in_pdu *in)
{
uint32_t itt = scsi_get_uint32(&in->hdr[16]);
uint32_t statsn = scsi_get_uint32(&in->hdr[24]);
uint32_t maxcmdsn = scsi_get_uint32(&in->hdr[32]);
uint32_t expcmdsn = scsi_get_uint32(&in->hdr[28]);
uint16_t status = scsi_get_uint16(&in->hdr[36]);
uint8_t flags = in->hdr[1];
enum iscsi_opcode opcode = in->hdr[0] & 0x3f;
/* RFC3720 10.13.5 (serials are invalid if status class != 0) */
if (opcode == ISCSI_PDU_LOGIN_RESPONSE && (status >> 8)) {
return;
}
if (iscsi_serial32_compare(maxcmdsn, iscsi->maxcmdsn) > 0) {
iscsi->maxcmdsn = maxcmdsn;
}
if (iscsi_serial32_compare(expcmdsn, iscsi->expcmdsn) > 0) {
iscsi->expcmdsn = expcmdsn;
}
/* RFC3720 10.7.3 (StatSN is invalid if S bit unset in flags) */
if (opcode == ISCSI_PDU_DATA_IN &&
!(flags & ISCSI_PDU_DATA_CONTAINS_STATUS)) {
return;
}
if (itt == 0xffffffff) {
/* target will not increase statsn if itt == 0xffffffff */
statsn--;
}
if (iscsi_serial32_compare(statsn, iscsi->statsn) > 0) {
iscsi->statsn = statsn;
}
}
int
iscsi_process_pdu(struct iscsi_context *iscsi, struct iscsi_in_pdu *in)
{
uint32_t itt = scsi_get_uint32(&in->hdr[16]);
enum iscsi_opcode opcode = in->hdr[0] & 0x3f;
uint8_t ahslen = in->hdr[4];
struct iscsi_pdu *pdu;
/* verify header checksum */
if (iscsi->header_digest != ISCSI_HEADER_DIGEST_NONE) {
uint32_t crc, crc_rcvd = 0;
crc = crc32c(in->hdr, ISCSI_RAW_HEADER_SIZE);
crc_rcvd |= in->hdr[ISCSI_RAW_HEADER_SIZE+0];
crc_rcvd |= in->hdr[ISCSI_RAW_HEADER_SIZE+1] << 8;
crc_rcvd |= in->hdr[ISCSI_RAW_HEADER_SIZE+2] << 16;
crc_rcvd |= in->hdr[ISCSI_RAW_HEADER_SIZE+3] << 24;
if (crc != crc_rcvd) {
iscsi_set_error(iscsi, "header checksum verification failed: calculated 0x%" PRIx32 " received 0x%" PRIx32, crc, crc_rcvd);
return -1;
}
}
/* verify data checksum ... */
if (iscsi->data_digest != ISCSI_DATA_DIGEST_NONE) {
int dsl = scsi_get_uint32(&in->hdr[4]) & 0x00ffffff;
/* ... but only if some data is present. */
if (dsl) {
uint32_t crc_rcvd = 0;
uint32_t crc = crc32c_chain_done(in->calculated_data_digest);
crc_rcvd |= in->data_digest_buf[0];
crc_rcvd |= in->data_digest_buf[1] << 8;
crc_rcvd |= in->data_digest_buf[2] << 16;
crc_rcvd |= in->data_digest_buf[3] << 24;
if (crc != crc_rcvd) {
iscsi_set_error(iscsi, "data checksum verification failed: calculated 0x%" PRIx32 " received 0x%" PRIx32, crc, crc_rcvd);
return -1;
}
}
}
if (ahslen != 0) {
iscsi_set_error(iscsi, "cant handle expanded headers yet");
return -1;
}
/* All target PDUs update the serials */
iscsi_process_pdu_serials(iscsi, in);
if (opcode == ISCSI_PDU_ASYNC_MSG) {
uint8_t event = in->hdr[36];
uint16_t param1 = scsi_get_uint16(&in->hdr[38]);
uint16_t param2 = scsi_get_uint16(&in->hdr[40]);
uint16_t param3 = scsi_get_uint16(&in->hdr[42]);
switch (event) {
case 0x0:
/* Just ignore these ones for now. It could be
* a UNIT_ATTENTION for some changes on the
* target but we don't have an API to pass this on
* to the application yet.
*/
ISCSI_LOG(iscsi, 2, "Ignoring received iSCSI AsyncMsg/"
"SCSI Async Event");
return 0;
case 0x1:
ISCSI_LOG(iscsi, 2, "target requests logout within %u seconds", param3);
/* this is an ugly workaround for DELL Equallogic FW 7.x bugs:
* Bug_71409 - I/O errors during volume move (present before 7.0.7)
* Bug_73732 - I/O errors during volume move operation (still present in 7.0.9)
*/
if (getenv("LIBISCSI_DROP_CONN_ON_ASYNC_EVENT1") != NULL) {
ISCSI_LOG(iscsi, 2, "dropping connection to fix errors with broken DELL Equallogic firmware 7.x");
return -1;
}
iscsi_logout_async(iscsi, iscsi_reconnect_after_logout, NULL);
return 0;
case 0x2:
ISCSI_LOG(iscsi, 2, "target will drop this connection. Time2Wait is %u seconds", param2);
iscsi->next_reconnect = time(NULL) + param2;
return 0;
case 0x3:
ISCSI_LOG(iscsi, 2, "target will drop all connections of this session. Time2Wait is %u seconds", param2);
iscsi->next_reconnect = time(NULL) + param2;
return 0;
case 0x4:
ISCSI_LOG(iscsi, 2, "target requests parameter renogitiation.");
iscsi_logout_async(iscsi, iscsi_reconnect_after_logout, NULL);
return 0;
default:
ISCSI_LOG(iscsi, 1, "unhandled async event %u: param1 %u param2 %u param3 %u", event, param1, param2, param3);
return -1;
}
}
if (opcode == ISCSI_PDU_REJECT) {
return iscsi_process_reject(iscsi, in);
}
if (opcode == ISCSI_PDU_NOP_IN && itt == 0xffffffff) {
if (iscsi_process_target_nop_in(iscsi, in) != 0) {
return -1;
}
return 0;
}
for (pdu = iscsi->waitpdu; pdu; pdu = pdu->next) {
enum iscsi_opcode expected_response = pdu->response_opcode;
int is_finished = 1;
if (pdu->itt != itt) {
continue;
}
/* we have a special case with scsi-command opcodes,
* they are replied to by either a scsi-response
* or a data-in, or a combination of both.
*/
if (opcode == ISCSI_PDU_DATA_IN
&& expected_response == ISCSI_PDU_SCSI_RESPONSE) {
expected_response = ISCSI_PDU_DATA_IN;
}
/* Another special case is if we get a R2T.
* In this case we should find the original request and just send an additional
* DATAOUT segment for this task.
*/
if (opcode == ISCSI_PDU_R2T) {
expected_response = ISCSI_PDU_R2T;
}
if (opcode != expected_response) {
iscsi_set_error(iscsi, "Got wrong opcode back for "
"itt:%d got:%d expected %d",
itt, opcode, pdu->response_opcode);
return -1;
}
switch (opcode) {
case ISCSI_PDU_LOGIN_RESPONSE:
if (iscsi_process_login_reply(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi login reply "
"failed");
return -1;
}
break;
case ISCSI_PDU_TEXT_RESPONSE:
if (iscsi_process_text_reply(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi text reply "
"failed");
return -1;
}
break;
case ISCSI_PDU_LOGOUT_RESPONSE:
if (iscsi_process_logout_reply(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi logout reply "
"failed");
return -1;
}
break;
case ISCSI_PDU_SCSI_RESPONSE:
if (iscsi_process_scsi_reply(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi response reply "
"failed");
return -1;
}
break;
case ISCSI_PDU_DATA_IN:
if (iscsi_process_scsi_data_in(iscsi, pdu, in,
&is_finished) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi data in "
"failed");
return -1;
}
break;
case ISCSI_PDU_NOP_IN:
if (iscsi_process_nop_out_reply(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi nop-in failed");
return -1;
}
break;
case ISCSI_PDU_SCSI_TASK_MANAGEMENT_RESPONSE:
if (iscsi_process_task_mgmt_reply(iscsi, pdu,
in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi task-mgmt failed");
return -1;
}
break;
case ISCSI_PDU_R2T:
if (iscsi_process_r2t(iscsi, pdu, in) != 0) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi r2t "
"failed");
return -1;
}
is_finished = 0;
break;
default:
iscsi_set_error(iscsi, "Don't know how to handle "
"opcode 0x%02x", opcode);
return -1;
}
if (is_finished && iscsi->waitpdu != NULL) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi->drv->free_pdu(iscsi, pdu);
}
return 0;
}
return 0;
}
void
iscsi_pdu_set_itt(struct iscsi_pdu *pdu, uint32_t itt)
{
scsi_set_uint32(&pdu->outdata.data[16], itt);
}
void
iscsi_pdu_set_ritt(struct iscsi_pdu *pdu, uint32_t ritt)
{
scsi_set_uint32(&pdu->outdata.data[20], ritt);
}
void
iscsi_pdu_set_pduflags(struct iscsi_pdu *pdu, unsigned char flags)
{
pdu->outdata.data[1] = flags;
}
void
iscsi_pdu_set_immediate(struct iscsi_pdu *pdu)
{
pdu->outdata.data[0] |= ISCSI_PDU_IMMEDIATE;
}
void
iscsi_pdu_set_ttt(struct iscsi_pdu *pdu, uint32_t ttt)
{
scsi_set_uint32(&pdu->outdata.data[20], ttt);
}
void
iscsi_pdu_set_cmdsn(struct iscsi_pdu *pdu, uint32_t cmdsn)
{
scsi_set_uint32(&pdu->outdata.data[24], cmdsn);
pdu->cmdsn = cmdsn;
}
void
iscsi_pdu_set_rcmdsn(struct iscsi_pdu *pdu, uint32_t rcmdsn)
{
scsi_set_uint32(&pdu->outdata.data[32], rcmdsn);
}
void
iscsi_pdu_set_datasn(struct iscsi_pdu *pdu, uint32_t datasn)
{
scsi_set_uint32(&pdu->outdata.data[36], datasn);
}
void
iscsi_pdu_set_expstatsn(struct iscsi_pdu *pdu, uint32_t expstatsnsn)
{
scsi_set_uint32(&pdu->outdata.data[28], expstatsnsn);
}
void
iscsi_pdu_set_bufferoffset(struct iscsi_pdu *pdu, uint32_t bufferoffset)
{
scsi_set_uint32(&pdu->outdata.data[40], bufferoffset);
}
void
iscsi_pdu_set_cdb(struct iscsi_pdu *pdu, struct scsi_task *task)
{
memset(&pdu->outdata.data[32], 0, 16);
memcpy(&pdu->outdata.data[32], task->cdb, task->cdb_size);
}
void
iscsi_pdu_set_lun(struct iscsi_pdu *pdu, uint32_t lun)
{
scsi_set_uint16(&pdu->outdata.data[8], lun);
}
void
iscsi_pdu_set_expxferlen(struct iscsi_pdu *pdu, uint32_t expxferlen)
{
pdu->expxferlen = expxferlen;
scsi_set_uint32(&pdu->outdata.data[20], expxferlen);
}
/*
* A WRITE16 command[w] handles R2T, and queues DATAOUT PDU m,x,y,z:
*
* outqueue->DATAOUT[x]->DATAOUT[y]->DATAOUT[z]...
* outqueue_current->DATAOUT[m]
* waitqueue->WRITE16[w]...
*
* 1, Once x, y, z gets released in initiator side, the target still expects the remaining
* DATAOUT PDUs.
* 2, Once command w timeout and callback to uplayer, uplayers usually releases memory of
* iscsi task(include memory referenced by iovec.iov_base). DATAOUT[m] would access
* invalid memory iovce.iov_base.
*/
static int iscsi_pdu_data_out_inprocess(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
struct iscsi_pdu *tmp_pdu, *next_pdu;
enum scsi_opcode opcode = pdu->outdata.data[32];
/* only care DATA OUT command here */
if ((pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_SCSI_REQUEST) {
return 0;
}
switch (opcode) {
case SCSI_OPCODE_WRITE10:
case SCSI_OPCODE_WRITE12:
case SCSI_OPCODE_WRITE16:
break;
default:
return 0;
};
/* current outgoing one is part of the PDU? */
if (iscsi->outqueue_current && (iscsi->outqueue_current->scsi_cbdata.task == pdu->scsi_cbdata.task)) {
return 1;
}
/* any child DATAOUT PDU in outqueue? */
for (tmp_pdu = iscsi->outqueue; tmp_pdu; tmp_pdu = next_pdu) {
next_pdu = tmp_pdu->next;
if (tmp_pdu->scsi_cbdata.task == pdu->scsi_cbdata.task) {
return 1;
}
}
return 0;
}
void
iscsi_timeout_scan(struct iscsi_context *iscsi)
{
struct iscsi_pdu *pdu;
struct iscsi_pdu *next_pdu;
time_t t = time(NULL);
uint32_t cmdsn_gap = 0;
for (pdu = iscsi->outqueue; pdu; pdu = next_pdu) {
next_pdu = pdu->next;
if (cmdsn_gap > 0) {
iscsi_pdu_set_cmdsn(pdu, pdu->cmdsn - cmdsn_gap);
}
if (pdu->scsi_timeout == 0) {
/* no timeout for this pdu */
continue;
}
if (t < pdu->scsi_timeout) {
/* not expired yet */
continue;
}
if (!(pdu->outdata.data[0] & ISCSI_PDU_IMMEDIATE) &&
(pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_DATA_OUT) {
iscsi->cmdsn--;
cmdsn_gap++;
} else {
continue;
}
ISCSI_LIST_REMOVE(&iscsi->outqueue, pdu);
iscsi_set_error(iscsi, "command timed out from outqueue");
iscsi_dump_pdu_header(iscsi, pdu->outdata.data);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_TIMEOUT,
NULL, pdu->private_data);
}
iscsi->drv->free_pdu(iscsi, pdu);
}
for (pdu = iscsi->waitpdu; pdu; pdu = next_pdu) {
next_pdu = pdu->next;
if (pdu->scsi_timeout == 0) {
/* no timeout for this pdu */
continue;
}
if (t < pdu->scsi_timeout) {
/* not expired yet */
continue;
}
if (iscsi_pdu_data_out_inprocess(iscsi, pdu)) {
continue;
}
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi_set_error(iscsi, "command timed out from waitqueue");
iscsi_dump_pdu_header(iscsi, pdu->outdata.data);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_TIMEOUT,
NULL, pdu->private_data);
}
iscsi->drv->free_pdu(iscsi, pdu);
}
}
int
iscsi_queue_pdu(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
int ret;
#ifdef HAVE_MULTITHREADING
iscsi_mt_mutex_lock(&iscsi->iscsi_mutex);
#endif /* HAVE_MULTITHREADING */
ret = iscsi->drv->queue_pdu(iscsi, pdu);
#ifdef HAVE_MULTITHREADING
iscsi_mt_mutex_unlock(&iscsi->iscsi_mutex);
#endif /* HAVE_MULTITHREADING */
return ret;
}
void
iscsi_cancel_pdus(struct iscsi_context *iscsi)
{
struct iscsi_pdu *pdu;
while ((pdu = iscsi->outqueue)) {
ISCSI_LIST_REMOVE(&iscsi->outqueue, pdu);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_CANCELLED,
NULL, pdu->private_data);
}
if (!(pdu->outdata.data[0] & ISCSI_PDU_IMMEDIATE) &&
(pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_DATA_OUT) {
iscsi->cmdsn--;
}
iscsi->drv->free_pdu(iscsi, pdu);
}
while ((pdu = iscsi->waitpdu)) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_CANCELLED,
NULL, pdu->private_data);
}
iscsi->drv->free_pdu(iscsi, pdu);
}
}
void
iscsi_cancel_lun_pdus(struct iscsi_context *iscsi, uint32_t lun)
{
struct iscsi_pdu *pdu;
struct iscsi_pdu *next_pdu;
uint32_t cmdsn_gap = 0;
struct scsi_task * task = NULL;
for (pdu = iscsi->outqueue; pdu; pdu = next_pdu) {
next_pdu = pdu->next;
task = iscsi_scsi_get_task_from_pdu(pdu);
if (cmdsn_gap > 0) {
iscsi_pdu_set_cmdsn(pdu, pdu->cmdsn - cmdsn_gap);
}
if (task == NULL || task->lun != lun) {
continue;
}
if (!(pdu->outdata.data[0] & ISCSI_PDU_IMMEDIATE) &&
(pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_DATA_OUT) {
iscsi->cmdsn--;
cmdsn_gap++;
}
ISCSI_LIST_REMOVE(&iscsi->outqueue, pdu);
iscsi_set_error(iscsi, "command cancelled");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_CANCELLED,
NULL, pdu->private_data);
}
iscsi->drv->free_pdu(iscsi, pdu);
}
}
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