[RFC-v3 7/9] iscsi-target: Refactor TX queue logic + export response PDU creation

Nicholas A. Bellinger
2013-04-04T07:35:52Z

This patch refactors TX immediate + response queue handling to use
the new iscsit_transport API callers, and exports the necessary
traditional iscsi PDU response creation functions for iser-target
to utilize.

This includes:

- Add iscsit_build_datain_pdu() for DATAIN PDU init + convert
iscsit_build_datain_pdu()
- Add iscsit_build_logout_rsp() for LOGOUT_RSP PDU init + convert
iscsit_send_logout()
- Add iscsit_build_nopin_rsp() for NOPIN_RSP PDU init + convert
iscsit_send_nopin()
- Add iscsit_build_rsp_pdu() for SCSI_RSP PDU init + convert
iscsit_send_response()
- Add iscsit_build_task_mgt_rsp for TM_RSP PDU init + convert
iscsit_send_task_mgt_rsp()
- Refactor immediate queue state switch into iscsit_immediate_queue()
- Convert handle_immediate_queue() to use iscsit_transport caller
- Refactor response queue state switch into iscsit_response_queue()
- Convert handle_response_queue to use iscsit_transport caller
- Export iscsit_logout_post_handler(), iscsit_increment_maxcmdsn()
and iscsit_tmr_post_handler() for external transport module usage

v3 changes:
- Add iscsit_build_reject for REJECT PDU init + convert
iscsit_send_reject()

v2 changes:

- Add iscsit_queue_rsp() for iscsit_transport->iscsit_queue_data_in()
and iscsit_transport->iscsit_queue_status()
- Update lio_queue_data_in() to use ->iscsit_queue_data_in()
- Update lio_queue_status() to use ->iscsit_queue_status()
- Use mutex_trylock() in iscsit_increment_maxcmdsn()

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/iscsi/iscsi_target.c | 661 ++++++++++++++------------
drivers/target/iscsi/iscsi_target_configfs.c | 7 +-
drivers/target/iscsi/iscsi_target_device.c | 7 +-
drivers/target/iscsi/iscsi_target_tmr.c | 1 +
4 files changed, 374 insertions(+), 302 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 19d4e08..3948aa1 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -70,8 +70,7 @@ struct kmem_cache *lio_ooo_cache;
struct kmem_cache *lio_r2t_cache;

static int iscsit_handle_immediate_data(struct iscsi_cmd *,
- unsigned char *buf, u32);
-static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+ struct iscsi_scsi_req *, u32);

struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
{
@@ -482,6 +481,15 @@ int iscsit_del_np(struct iscsi_np *np)
return 0;
}

+static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
+static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
+
+static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+ iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+ return 0;
+}
+
static struct iscsit_transport iscsi_target_transport = {
.name = "iSCSI/TCP",
.transport_type = ISCSI_TCP,
@@ -493,6 +501,10 @@ static struct iscsit_transport iscsi_target_transport = {
.iscsit_get_login_rx = iscsit_get_login_rx,
.iscsit_put_login_tx = iscsit_put_login_tx,
.iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
+ .iscsit_immediate_queue = iscsit_immediate_queue,
+ .iscsit_response_queue = iscsit_response_queue,
+ .iscsit_queue_data_in = iscsit_queue_rsp,
+ .iscsit_queue_status = iscsit_queue_rsp,
};

static int __init iscsi_target_init_module(void)
@@ -651,14 +663,6 @@ static int iscsit_add_reject(
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);

ret = wait_for_completion_interruptible(&cmd->reject_comp);
- /*
- * Perform the kref_put now if se_cmd has been setup by
- * iscsit_setup_scsi_cmd()
- */
- if (cmd->se_cmd.se_tfo != NULL) {
- pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
- target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
- }
if (ret != 0)
return -1;

@@ -2536,18 +2540,60 @@ static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
}
}

-static int iscsit_send_data_in(
- struct iscsi_cmd *cmd,
- struct iscsi_conn *conn)
+static void
+iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
+ bool set_statsn)
{
- int iov_ret = 0, set_statsn = 0;
- u32 iov_count = 0, tx_size = 0;
+ hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
+ hdr->flags = datain->flags;
+ if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
+ if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
+ } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
+ hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
+ }
+ }
+ hton24(hdr->dlength, datain->length);
+ if (hdr->flags & ISCSI_FLAG_DATA_ACK)
+ int_to_scsilun(cmd->se_cmd.orig_fe_lun,
+ (struct scsi_lun *)&hdr->lun);
+ else
+ put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
+
+ hdr->itt = cmd->init_task_tag;
+
+ if (hdr->flags & ISCSI_FLAG_DATA_ACK)
+ hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
+ else
+ hdr->ttt = cpu_to_be32(0xFFFFFFFF);
+ if (set_statsn)
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ else
+ hdr->statsn = cpu_to_be32(0xFFFFFFFF);
+
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ hdr->datasn = cpu_to_be32(datain->data_sn);
+ hdr->offset = cpu_to_be32(datain->offset);
+
+ pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
+ " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
+ cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
+ ntohl(hdr->offset), datain->length, conn->cid);
+}
+
+static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
struct iscsi_datain datain;
struct iscsi_datain_req *dr;
- struct iscsi_data_rsp *hdr;
struct kvec *iov;
- int eodr = 0;
- int ret;
+ u32 iov_count = 0, tx_size = 0;
+ int eodr = 0, ret, iov_ret;
+ bool set_statsn = false;

memset(&datain, 0, sizeof(struct iscsi_datain));
dr = iscsit_get_datain_values(cmd, &datain);
@@ -2556,7 +2602,6 @@ static int iscsit_send_data_in(
cmd->init_task_tag);
return -1;
}
-
/*
* Be paranoid and double check the logic for now.
*/
@@ -2564,7 +2609,7 @@ static int iscsit_send_data_in(
pr_err("Command ITT: 0x%08x, datain.offset: %u and"
" datain.length: %u exceeds cmd->data_length: %u\n",
cmd->init_task_tag, datain.offset, datain.length,
- cmd->se_cmd.data_length);
+ cmd->se_cmd.data_length);
return -1;
}

@@ -2588,47 +2633,13 @@ static int iscsit_send_data_in(
(dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
iscsit_increment_maxcmdsn(cmd, conn->sess);
cmd->stat_sn = conn->stat_sn++;
- set_statsn = 1;
+ set_statsn = true;
} else if (dr->dr_complete ==
- DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
- set_statsn = 1;
+ DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
+ set_statsn = true;
}

- hdr = (struct iscsi_data_rsp *) cmd->pdu;
- memset(hdr, 0, ISCSI_HDR_LEN);
- hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
- hdr->flags = datain.flags;
- if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
- if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
- hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
- hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
- } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
- hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
- hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
- }
- }
- hton24(hdr->dlength, datain.length);
- if (hdr->flags & ISCSI_FLAG_DATA_ACK)
- int_to_scsilun(cmd->se_cmd.orig_fe_lun,
- (struct scsi_lun *)&hdr->lun);
- else
- put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
-
- hdr->itt = cmd->init_task_tag;
-
- if (hdr->flags & ISCSI_FLAG_DATA_ACK)
- hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
- else
- hdr->ttt = cpu_to_be32(0xFFFFFFFF);
- if (set_statsn)
- hdr->statsn = cpu_to_be32(cmd->stat_sn);
- else
- hdr->statsn = cpu_to_be32(0xFFFFFFFF);
-
- hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
- hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
- hdr->datasn = cpu_to_be32(datain.data_sn);
- hdr->offset = cpu_to_be32(datain.offset);
+ iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);

iov = &cmd->iov_data[0];
iov[iov_count].iov_base = cmd->pdu;
@@ -2639,7 +2650,7 @@ static int iscsit_send_data_in(
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];

iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
+ (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);

iov[0].iov_len += ISCSI_CRC_LEN;
@@ -2649,7 +2660,8 @@ static int iscsit_send_data_in(
" for DataIN PDU 0x%08x\n", *header_digest);
}

- iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
+ iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
+ datain.offset, datain.length);
if (iov_ret < 0)
return -1;

@@ -2680,11 +2692,6 @@ static int iscsit_send_data_in(
cmd->iov_data_count = iov_count;
cmd->tx_size = tx_size;

- pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
- " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
- cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
- ntohl(hdr->offset), datain.length, conn->cid);
-
/* sendpage is preferred but can't insert markers */
if (!conn->conn_ops->IFMarker)
ret = iscsit_fe_sendpage_sg(cmd, conn);
@@ -2707,16 +2714,13 @@ static int iscsit_send_data_in(
return eodr;
}

-static int iscsit_send_logout_response(
- struct iscsi_cmd *cmd,
- struct iscsi_conn *conn)
+int
+iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ struct iscsi_logout_rsp *hdr)
{
- int niov = 0, tx_size;
struct iscsi_conn *logout_conn = NULL;
struct iscsi_conn_recovery *cr = NULL;
struct iscsi_session *sess = conn->sess;
- struct kvec *iov;
- struct iscsi_logout_rsp *hdr;
/*
* The actual shutting down of Sessions and/or Connections
* for CLOSESESSION and CLOSECONNECTION Logout Requests
@@ -2785,9 +2789,6 @@ static int iscsit_send_logout_response(
return -1;
}

- tx_size = ISCSI_HDR_LEN;
- hdr = (struct iscsi_logout_rsp *)cmd->pdu;
- memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_LOGOUT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hdr->response = cmd->logout_response;
@@ -2799,6 +2800,27 @@ static int iscsit_send_logout_response(
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);

+ pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
+ " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
+ cmd->init_task_tag, cmd->stat_sn, hdr->response,
+ cmd->logout_cid, conn->cid);
+
+ return 0;
+}
+EXPORT_SYMBOL(iscsit_build_logout_rsp);
+
+static int
+iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct kvec *iov;
+ int niov = 0, tx_size, rc;
+
+ rc = iscsit_build_logout_rsp(cmd, conn,
+ (struct iscsi_logout_rsp *)&cmd->pdu[0]);
+ if (rc < 0)
+ return rc;
+
+ tx_size = ISCSI_HDR_LEN;
iov = &cmd->iov_misc[0];
iov[niov].iov_base = cmd->pdu;
iov[niov++].iov_len = ISCSI_HDR_LEN;
@@ -2807,7 +2829,7 @@ static int iscsit_send_logout_response(
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];

iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
+ (unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);

iov[0].iov_len += ISCSI_CRC_LEN;
@@ -2818,14 +2840,37 @@ static int iscsit_send_logout_response(
cmd->iov_misc_count = niov;
cmd->tx_size = tx_size;

- pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
- " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
- cmd->init_task_tag, cmd->stat_sn, hdr->response,
- cmd->logout_cid, conn->cid);
-
return 0;
}

+void
+iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ struct iscsi_nopin *hdr, bool nopout_response)
+{
+ hdr->opcode = ISCSI_OP_NOOP_IN;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, cmd->buf_ptr_size);
+ if (nopout_response)
+ put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
+ hdr->itt = cmd->init_task_tag;
+ hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
+ cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
+ conn->stat_sn;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+
+ if (nopout_response)
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+ pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
+ " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
+ "Solicitied" : "Unsolicitied", cmd->init_task_tag,
+ cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
+}
+EXPORT_SYMBOL(iscsit_build_nopin_rsp);
+
/*
* Unsolicited NOPIN, either requesting a response or not.
*/
@@ -2834,20 +2879,10 @@ static int iscsit_send_unsolicited_nopin(
struct iscsi_conn *conn,
int want_response)
{
- int tx_size = ISCSI_HDR_LEN;
- struct iscsi_nopin *hdr;
- int ret;
+ struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
+ int tx_size = ISCSI_HDR_LEN, ret;

- hdr = (struct iscsi_nopin *) cmd->pdu;
- memset(hdr, 0, ISCSI_HDR_LEN);
- hdr->opcode = ISCSI_OP_NOOP_IN;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- hdr->itt = cmd->init_task_tag;
- hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
- cmd->stat_sn = conn->stat_sn;
- hdr->statsn = cpu_to_be32(cmd->stat_sn);
- hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
- hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ iscsit_build_nopin_rsp(cmd, conn, hdr, false);

if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
@@ -2883,31 +2918,17 @@ static int iscsit_send_unsolicited_nopin(
return 0;
}

-static int iscsit_send_nopin_response(
- struct iscsi_cmd *cmd,
- struct iscsi_conn *conn)
+static int
+iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
- int niov = 0, tx_size;
- u32 padding = 0;
+ struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
struct kvec *iov;
- struct iscsi_nopin *hdr;
-
- tx_size = ISCSI_HDR_LEN;
- hdr = (struct iscsi_nopin *) cmd->pdu;
- memset(hdr, 0, ISCSI_HDR_LEN);
- hdr->opcode = ISCSI_OP_NOOP_IN;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- hton24(hdr->dlength, cmd->buf_ptr_size);
- put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
- hdr->itt = cmd->init_task_tag;
- hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
- cmd->stat_sn = conn->stat_sn++;
- hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ u32 padding = 0;
+ int niov = 0, tx_size;

- iscsit_increment_maxcmdsn(cmd, conn->sess);
- hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
- hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ iscsit_build_nopin_rsp(cmd, conn, hdr, true);

+ tx_size = ISCSI_HDR_LEN;
iov = &cmd->iov_misc[0];
iov[niov].iov_base = cmd->pdu;
iov[niov++].iov_len = ISCSI_HDR_LEN;
@@ -2963,10 +2984,6 @@ static int iscsit_send_nopin_response(
cmd->iov_misc_count = niov;
cmd->tx_size = tx_size;

- pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
- " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
- cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
-
return 0;
}

@@ -3127,24 +3144,16 @@ int iscsit_build_r2ts_for_cmd(
return 0;
}

-static int iscsit_send_status(
- struct iscsi_cmd *cmd,
- struct iscsi_conn *conn)
+void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
{
- u8 iov_count = 0, recovery;
- u32 padding = 0, tx_size = 0;
- struct iscsi_scsi_rsp *hdr;
- struct kvec *iov;
-
- recovery = (cmd->i_state != ISTATE_SEND_STATUS);
- if (!recovery)
+ if (inc_stat_sn)
cmd->stat_sn = conn->stat_sn++;

spin_lock_bh(&conn->sess->session_stats_lock);
conn->sess->rsp_pdus++;
spin_unlock_bh(&conn->sess->session_stats_lock);

- hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
@@ -3164,6 +3173,23 @@ static int iscsit_send_status(
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);

+ pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
+ " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
+ cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
+ cmd->se_cmd.scsi_status, conn->cid);
+}
+EXPORT_SYMBOL(iscsit_build_rsp_pdu);
+
+static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
+ struct kvec *iov;
+ u32 padding = 0, tx_size = 0;
+ int iov_count = 0;
+ bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
+
+ iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
+
iov = &cmd->iov_misc[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
@@ -3218,7 +3244,7 @@ static int iscsit_send_status(
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];

iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
+ (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
0, NULL, (u8 *)header_digest);

iov[0].iov_len += ISCSI_CRC_LEN;
@@ -3230,11 +3256,6 @@ static int iscsit_send_status(
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;

- pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
- " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
- (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
- cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
-
return 0;
}

@@ -3257,16 +3278,12 @@ static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
}
}

-static int iscsit_send_task_mgt_rsp(
- struct iscsi_cmd *cmd,
- struct iscsi_conn *conn)
+void
+iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ struct iscsi_tm_rsp *hdr)
{
struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
- struct iscsi_tm_rsp *hdr;
- u32 tx_size = 0;

- hdr = (struct iscsi_tm_rsp *) cmd->pdu;
- memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
@@ -3278,6 +3295,20 @@ static int iscsit_send_task_mgt_rsp(
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);

+ pr_debug("Built Task Management Response ITT: 0x%08x,"
+ " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
+ cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
+}
+EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
+
+static int
+iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
+ u32 tx_size = 0;
+
+ iscsit_build_task_mgt_rsp(cmd, conn, hdr);
+
cmd->iov_misc[0].iov_base = cmd->pdu;
cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
@@ -3298,10 +3329,6 @@ static int iscsit_send_task_mgt_rsp(
cmd->iov_misc_count = 1;
cmd->tx_size = tx_size;

- pr_debug("Built Task Management Response ITT: 0x%08x,"
- " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
- cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
-
return 0;
}

@@ -3497,6 +3524,22 @@ static int iscsit_send_text_rsp(
return 0;
}

+void
+iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ struct iscsi_reject *hdr)
+{
+ hdr->opcode = ISCSI_OP_REJECT;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hton24(hdr->dlength, ISCSI_HDR_LEN);
+ hdr->ffffffff = cpu_to_be32(0xffffffff);
+ cmd->stat_sn = conn->stat_sn++;
+ hdr->statsn = cpu_to_be32(cmd->stat_sn);
+ hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
+ hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+
+}
+EXPORT_SYMBOL(iscsit_build_reject);
+
static int iscsit_send_reject(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
@@ -3505,18 +3548,9 @@ static int iscsit_send_reject(
struct iscsi_reject *hdr;
struct kvec *iov;

- hdr = (struct iscsi_reject *) cmd->pdu;
- hdr->opcode = ISCSI_OP_REJECT;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- hton24(hdr->dlength, ISCSI_HDR_LEN);
- hdr->ffffffff = cpu_to_be32(0xffffffff);
- cmd->stat_sn = conn->stat_sn++;
- hdr->statsn = cpu_to_be32(cmd->stat_sn);
- hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
- hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
+ iscsit_build_reject(cmd, conn, (struct iscsi_reject *)&cmd->pdu[0]);

iov = &cmd->iov_misc[0];
-
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
iov[iov_count].iov_base = cmd->buf_ptr;
@@ -3613,55 +3647,41 @@ static inline void iscsit_thread_check_cpumask(
set_cpus_allowed_ptr(p, conn->conn_cpumask);
}

-static int handle_immediate_queue(struct iscsi_conn *conn)
+static int
+iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
{
- struct iscsi_queue_req *qr;
- struct iscsi_cmd *cmd;
- u8 state;
int ret;

- while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
- atomic_set(&conn->check_immediate_queue, 0);
- cmd = qr->cmd;
- state = qr->state;
- kmem_cache_free(lio_qr_cache, qr);
-
- switch (state) {
- case ISTATE_SEND_R2T:
- ret = iscsit_send_r2t(cmd, conn);
- if (ret < 0)
- goto err;
- break;
- case ISTATE_REMOVE:
- if (cmd->data_direction == DMA_TO_DEVICE)
- iscsit_stop_dataout_timer(cmd);
-
- spin_lock_bh(&conn->cmd_lock);
- list_del(&cmd->i_conn_node);
- spin_unlock_bh(&conn->cmd_lock);
+ switch (state) {
+ case ISTATE_SEND_R2T:
+ ret = iscsit_send_r2t(cmd, conn);
+ if (ret < 0)
+ goto err;
+ break;
+ case ISTATE_REMOVE:
+ spin_lock_bh(&conn->cmd_lock);
+ list_del(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);

- iscsit_free_cmd(cmd);
- continue;
- case ISTATE_SEND_NOPIN_WANT_RESPONSE:
- iscsit_mod_nopin_response_timer(conn);
- ret = iscsit_send_unsolicited_nopin(cmd,
- conn, 1);
- if (ret < 0)
- goto err;
- break;
- case ISTATE_SEND_NOPIN_NO_RESPONSE:
- ret = iscsit_send_unsolicited_nopin(cmd,
- conn, 0);
- if (ret < 0)
- goto err;
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag, state,
- conn->cid);
+ iscsit_free_cmd(cmd);
+ break;
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ iscsit_mod_nopin_response_timer(conn);
+ ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
+ if (ret < 0)
goto err;
- }
+ break;
+ case ISTATE_SEND_NOPIN_NO_RESPONSE:
+ ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
+ if (ret < 0)
+ goto err;
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag, state,
+ conn->cid);
+ goto err;
}

return 0;
@@ -3670,128 +3690,149 @@ err:
return -1;
}

-static int handle_response_queue(struct iscsi_conn *conn)
+static int
+iscsit_handle_immediate_queue(struct iscsi_conn *conn)
{
+ struct iscsit_transport *t = conn->conn_transport;
struct iscsi_queue_req *qr;
struct iscsi_cmd *cmd;
u8 state;
int ret;

- while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
+ while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
+ atomic_set(&conn->check_immediate_queue, 0);
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);

-check_rsp_state:
- switch (state) {
- case ISTATE_SEND_DATAIN:
- ret = iscsit_send_data_in(cmd, conn);
- if (ret < 0)
- goto err;
- else if (!ret)
- /* more drs */
- goto check_rsp_state;
- else if (ret == 1) {
- /* all done */
- spin_lock_bh(&cmd->istate_lock);
- cmd->i_state = ISTATE_SENT_STATUS;
- spin_unlock_bh(&cmd->istate_lock);
-
- if (atomic_read(&conn->check_immediate_queue))
- return 1;
+ ret = t->iscsit_immediate_queue(conn, cmd, state);
+ if (ret < 0)
+ return ret;
+ }

- continue;
- } else if (ret == 2) {
- /* Still must send status,
- SCF_TRANSPORT_TASK_SENSE was set */
- spin_lock_bh(&cmd->istate_lock);
- cmd->i_state = ISTATE_SEND_STATUS;
- spin_unlock_bh(&cmd->istate_lock);
- state = ISTATE_SEND_STATUS;
- goto check_rsp_state;
- }
+ return 0;
+}

- break;
- case ISTATE_SEND_STATUS:
- case ISTATE_SEND_STATUS_RECOVERY:
- ret = iscsit_send_status(cmd, conn);
- break;
- case ISTATE_SEND_LOGOUTRSP:
- ret = iscsit_send_logout_response(cmd, conn);
- break;
- case ISTATE_SEND_ASYNCMSG:
- ret = iscsit_send_conn_drop_async_message(
- cmd, conn);
- break;
- case ISTATE_SEND_NOPIN:
- ret = iscsit_send_nopin_response(cmd, conn);
- break;
- case ISTATE_SEND_REJECT:
- ret = iscsit_send_reject(cmd, conn);
- break;
- case ISTATE_SEND_TASKMGTRSP:
- ret = iscsit_send_task_mgt_rsp(cmd, conn);
- if (ret != 0)
- break;
- ret = iscsit_tmr_post_handler(cmd, conn);
- if (ret != 0)
- iscsit_fall_back_to_erl0(conn->sess);
- break;
- case ISTATE_SEND_TEXTRSP:
- ret = iscsit_send_text_rsp(cmd, conn);
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag,
- state, conn->cid);
- goto err;
- }
+static int
+iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+ int ret;
+
+check_rsp_state:
+ switch (state) {
+ case ISTATE_SEND_DATAIN:
+ ret = iscsit_send_datain(cmd, conn);
if (ret < 0)
goto err;
+ else if (!ret)
+ /* more drs */
+ goto check_rsp_state;
+ else if (ret == 1) {
+ /* all done */
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SENT_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);

- if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
- iscsit_tx_thread_wait_for_tcp(conn);
- iscsit_unmap_iovec(cmd);
- goto err;
+ if (atomic_read(&conn->check_immediate_queue))
+ return 1;
+
+ return 0;
+ } else if (ret == 2) {
+ /* Still must send status,
+ SCF_TRANSPORT_TASK_SENSE was set */
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SEND_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ state = ISTATE_SEND_STATUS;
+ goto check_rsp_state;
}
- iscsit_unmap_iovec(cmd);

- switch (state) {
- case ISTATE_SEND_LOGOUTRSP:
- if (!iscsit_logout_post_handler(cmd, conn))
- goto restart;
- /* fall through */
- case ISTATE_SEND_STATUS:
- case ISTATE_SEND_ASYNCMSG:
- case ISTATE_SEND_NOPIN:
- case ISTATE_SEND_STATUS_RECOVERY:
- case ISTATE_SEND_TEXTRSP:
- case ISTATE_SEND_TASKMGTRSP:
+ break;
+ case ISTATE_SEND_STATUS:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ ret = iscsit_send_response(cmd, conn);
+ break;
+ case ISTATE_SEND_LOGOUTRSP:
+ ret = iscsit_send_logout(cmd, conn);
+ break;
+ case ISTATE_SEND_ASYNCMSG:
+ ret = iscsit_send_conn_drop_async_message(
+ cmd, conn);
+ break;
+ case ISTATE_SEND_NOPIN:
+ ret = iscsit_send_nopin(cmd, conn);
+ if (!ret) {
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
+ return 0;
+ }
+ break;
+ case ISTATE_SEND_REJECT:
+ ret = iscsit_send_reject(cmd, conn);
+ break;
+ case ISTATE_SEND_TASKMGTRSP:
+ ret = iscsit_send_task_mgt_rsp(cmd, conn);
+ if (ret != 0)
break;
- case ISTATE_SEND_REJECT:
- if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
- cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
- complete(&cmd->reject_comp);
- goto err;
- }
+ ret = iscsit_tmr_post_handler(cmd, conn);
+ if (ret != 0)
+ iscsit_fall_back_to_erl0(conn->sess);
+ break;
+ case ISTATE_SEND_TEXTRSP:
+ ret = iscsit_send_text_rsp(cmd, conn);
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ state, conn->cid);
+ goto err;
+ }
+ if (ret < 0)
+ goto err;
+
+ if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
+ iscsit_tx_thread_wait_for_tcp(conn);
+ iscsit_unmap_iovec(cmd);
+ goto err;
+ }
+ iscsit_unmap_iovec(cmd);
+
+ switch (state) {
+ case ISTATE_SEND_LOGOUTRSP:
+ if (!iscsit_logout_post_handler(cmd, conn))
+ goto restart;
+ /* fall through */
+ case ISTATE_SEND_STATUS:
+ case ISTATE_SEND_ASYNCMSG:
+ case ISTATE_SEND_NOPIN:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ case ISTATE_SEND_TEXTRSP:
+ case ISTATE_SEND_TASKMGTRSP:
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SENT_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ break;
+ case ISTATE_SEND_REJECT:
+ if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
+ cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
complete(&cmd->reject_comp);
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag,
- cmd->i_state, conn->cid);
goto err;
}
-
- if (atomic_read(&conn->check_immediate_queue))
- return 1;
+ complete(&cmd->reject_comp);
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ cmd->i_state, conn->cid);
+ goto err;
}

+ if (atomic_read(&conn->check_immediate_queue))
+ return 1;
+
return 0;

err:
@@ -3800,6 +3841,27 @@ restart:
return -EAGAIN;
}

+static int iscsit_handle_response_queue(struct iscsi_conn *conn)
+{
+ struct iscsit_transport *t = conn->conn_transport;
+ struct iscsi_queue_req *qr;
+ struct iscsi_cmd *cmd;
+ u8 state;
+ int ret;
+
+ while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
+ cmd = qr->cmd;
+ state = qr->state;
+ kmem_cache_free(lio_qr_cache, qr);
+
+ ret = t->iscsit_response_queue(conn, cmd, state);
+ if (ret == 1 || ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
int iscsi_target_tx_thread(void *arg)
{
int ret = 0;
@@ -3834,11 +3896,11 @@ restart:
goto transport_err;

get_immediate:
- ret = handle_immediate_queue(conn);
+ ret = iscsit_handle_immediate_queue(conn);
if (ret < 0)
goto transport_err;

- ret = handle_response_queue(conn);
+ ret = iscsit_handle_response_queue(conn);
if (ret == 1)
goto get_immediate;
else if (ret == -EAGAIN)
@@ -4438,7 +4500,7 @@ static void iscsit_logout_post_handler_diffcid(
/*
* Return of 0 causes the TX thread to restart.
*/
-static int iscsit_logout_post_handler(
+int iscsit_logout_post_handler(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
@@ -4496,6 +4558,7 @@ static int iscsit_logout_post_handler(
}
return ret;
}
+EXPORT_SYMBOL(iscsit_logout_post_handler);

void iscsit_fail_session(struct iscsi_session *sess)
{
diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index ce3d321..2704daf 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -27,6 +27,7 @@
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>
+#include <target/iscsi/iscsi_transport.h>

#include "iscsi_target_core.h"
#include "iscsi_target_parameters.h"
@@ -1536,7 +1537,8 @@ static int lio_queue_data_in(struct se_cmd *se_cmd)
struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);

cmd->i_state = ISTATE_SEND_DATAIN;
- iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+ cmd->conn->conn_transport->iscsit_queue_data_in(cmd->conn, cmd);
+
return 0;
}

@@ -1568,7 +1570,8 @@ static int lio_queue_status(struct se_cmd *se_cmd)
struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);

cmd->i_state = ISTATE_SEND_STATUS;
- iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+ cmd->conn->conn_transport->iscsit_queue_status(cmd->conn, cmd);
+
return 0;
}

diff --git a/drivers/target/iscsi/iscsi_target_device.c b/drivers/target/iscsi/iscsi_target_device.c
index bcc4098..1b74033 100644
--- a/drivers/target/iscsi/iscsi_target_device.c
+++ b/drivers/target/iscsi/iscsi_target_device.c
@@ -60,8 +60,13 @@ void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess

cmd->maxcmdsn_inc = 1;

- mutex_lock(&sess->cmdsn_mutex);
+ if (!mutex_trylock(&sess->cmdsn_mutex)) {
+ sess->max_cmd_sn += 1;
+ pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
+ return;
+ }
sess->max_cmd_sn += 1;
pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
mutex_unlock(&sess->cmdsn_mutex);
}
+EXPORT_SYMBOL(iscsit_increment_maxcmdsn);
diff --git a/drivers/target/iscsi/iscsi_target_tmr.c b/drivers/target/iscsi/iscsi_target_tmr.c
index 16ca0ef..b997e5d 100644
--- a/drivers/target/iscsi/iscsi_target_tmr.c
+++ b/drivers/target/iscsi/iscsi_target_tmr.c
@@ -472,6 +472,7 @@ int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn)

return 0;
}
+EXPORT_SYMBOL(iscsit_tmr_post_handler);

/*
* Nothing to do here, but leave it for good measure. :-)
--
1.7.2.5