Merge branch 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

Pull SCSI target update from Nicholas Bellinger:
 "The highlights this round include:

   - Add fileio support for WRITE_SAME w/ UNMAP=1 discard (asias)
   - Add fileio support for UNMAP discard (asias)
   - Add tcm_vhost hotplug support to work with upstream QEMU
     vhost-scsi-pci code (asias + mst)
   - Check for aborted sequence in tcm_fc response path (mdr)
   - Add initial iscsit_transport support into iscsi-target code (nab)
   - Refactor iscsi-target RX PDU logic + export request PDU handling
     (nab)
   - Refactor iscsi-target TX queue logic + export response PDU creation
     (nab)
   - Add new iSCSI Extentions for RDMA (ISER) target driver (Or + nab)

  The biggest changes revolve around iscsi-target refactoring in order
  to support the iser-target driver.  This includes the conversion of
  the iscsi-target data-path to use modern se_cmd->cmd_kref counting,
  and allowing transport independent aspects of RX/TX PDU
  request/response handling be shared across existing traditional
  iscsi-target code, and the new iser-target code.

  Thanks to Or Gerlitz + Mellanox for supporting the iser-target
  development effort!"

* 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (25 commits)
  iser-target: Add iSCSI Extensions for RDMA (iSER) target driver
  tcm_vhost: Enable VIRTIO_SCSI_F_HOTPLUG
  tcm_vhost: Add ioctl to get and set events missed flag
  tcm_vhost: Add hotplug/hotunplug support
  tcm_vhost: Refactor the lock nesting rule
  tcm_fc: Check for aborted sequence
  iscsi-target: Add iser network portal attribute
  iscsi-target: Refactor TX queue logic + export response PDU creation
  iscsi-target: Refactor RX PDU logic + export request PDU handling
  iscsi-target: Add per transport iscsi_cmd alloc/free
  iscsi-target: Add iser-target parameter keys + setup during login
  iscsi-target: Initial traditional TCP conversion to iscsit_transport
  iscsi-target: Add iscsit_transport API template
  target: Add export of target_get_sess_cmd symbol
  target: Change default sense key of NOT_READY
  target/file: Set is_nonrot attribute
  target: Add sbc_execute_unmap() helper
  target/iblock: Add iblock_do_unmap() helper
  target/file: Add fd_do_unmap() helper
  target/file: Add UNMAP emulation support
  ...

drivers/infiniband/Kconfig

@@ -59,5 +59,6 @@ source "drivers/infiniband/ulp/srp/Kconfig"
 source "drivers/infiniband/ulp/srpt/Kconfig"
 
 source "drivers/infiniband/ulp/iser/Kconfig"
+source "drivers/infiniband/ulp/isert/Kconfig"
 
 endif # INFINIBAND

drivers/infiniband/Makefile

@@ -13,3 +13,4 @@ obj-$(CONFIG_INFINIBAND_IPOIB)		+= ulp/ipoib/
 obj-$(CONFIG_INFINIBAND_SRP)		+= ulp/srp/
 obj-$(CONFIG_INFINIBAND_SRPT)		+= ulp/srpt/
 obj-$(CONFIG_INFINIBAND_ISER)		+= ulp/iser/
+obj-$(CONFIG_INFINIBAND_ISERT)		+= ulp/isert/

drivers/infiniband/ulp/isert/Kconfig

+config INFINIBAND_ISERT
+	tristate "iSCSI Extentions for RDMA (iSER) target support"
+	depends on INET && INFINIBAND_ADDR_TRANS && TARGET_CORE && ISCSI_TARGET
+	---help---
+	Support for iSCSI Extentions for RDMA (iSER) Target on Infiniband fabrics.

drivers/infiniband/ulp/isert/Makefile

+ccflags-y		:= -Idrivers/target -Idrivers/target/iscsi
+obj-$(CONFIG_INFINIBAND_ISERT)	+= ib_isert.o

drivers/infiniband/ulp/isert/ib_isert.h

+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+#define ISERT_RDMA_LISTEN_BACKLOG	10
+
+enum isert_desc_type {
+	ISCSI_TX_CONTROL,
+	ISCSI_TX_DATAIN
+};
+
+enum iser_ib_op_code {
+	ISER_IB_RECV,
+	ISER_IB_SEND,
+	ISER_IB_RDMA_WRITE,
+	ISER_IB_RDMA_READ,
+};
+
+enum iser_conn_state {
+	ISER_CONN_INIT,
+	ISER_CONN_UP,
+	ISER_CONN_TERMINATING,
+	ISER_CONN_DOWN,
+};
+
+struct iser_rx_desc {
+	struct iser_hdr iser_header;
+	struct iscsi_hdr iscsi_header;
+	char		data[ISER_RECV_DATA_SEG_LEN];
+	u64		dma_addr;
+	struct ib_sge	rx_sg;
+	char		pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+struct iser_tx_desc {
+	struct iser_hdr iser_header;
+	struct iscsi_hdr iscsi_header;
+	enum isert_desc_type type;
+	u64		dma_addr;
+	struct ib_sge	tx_sg[2];
+	int		num_sge;
+	struct isert_cmd *isert_cmd;
+	struct ib_send_wr send_wr;
+} __packed;
+
+struct isert_rdma_wr {
+	struct list_head	wr_list;
+	struct isert_cmd	*isert_cmd;
+	enum iser_ib_op_code	iser_ib_op;
+	struct ib_sge		*ib_sge;
+	int			num_sge;
+	struct scatterlist	*sge;
+	int			send_wr_num;
+	struct ib_send_wr	*send_wr;
+};
+
+struct isert_cmd {
+	uint32_t		read_stag;
+	uint32_t		write_stag;
+	uint64_t		read_va;
+	uint64_t		write_va;
+	u64			sense_buf_dma;
+	u32			sense_buf_len;
+	u32			read_va_off;
+	u32			write_va_off;
+	u32			rdma_wr_num;
+	struct isert_conn	*conn;
+	struct iscsi_cmd	iscsi_cmd;
+	struct ib_sge		*ib_sge;
+	struct iser_tx_desc	tx_desc;
+	struct isert_rdma_wr	rdma_wr;
+	struct work_struct	comp_work;
+};
+
+struct isert_device;
+
+struct isert_conn {
+	enum iser_conn_state	state;
+	bool			logout_posted;
+	int			post_recv_buf_count;
+	atomic_t		post_send_buf_count;
+	u32			responder_resources;
+	u32			initiator_depth;
+	u32			max_sge;
+	char			*login_buf;
+	char			*login_req_buf;
+	char			*login_rsp_buf;
+	u64			login_req_dma;
+	u64			login_rsp_dma;
+	unsigned int		conn_rx_desc_head;
+	struct iser_rx_desc	*conn_rx_descs;
+	struct ib_recv_wr	conn_rx_wr[ISERT_MIN_POSTED_RX];
+	struct iscsi_conn	*conn;
+	struct list_head	conn_accept_node;
+	struct completion	conn_login_comp;
+	struct iser_tx_desc	conn_login_tx_desc;
+	struct rdma_cm_id	*conn_cm_id;
+	struct ib_pd		*conn_pd;
+	struct ib_mr		*conn_mr;
+	struct ib_qp		*conn_qp;
+	struct isert_device	*conn_device;
+	struct work_struct	conn_logout_work;
+	wait_queue_head_t	conn_wait;
+	wait_queue_head_t	conn_wait_comp_err;
+	struct kref		conn_kref;
+};
+
+#define ISERT_MAX_CQ 64
+
+struct isert_cq_desc {
+	struct isert_device	*device;
+	int			cq_index;
+	struct work_struct	cq_rx_work;
+	struct work_struct	cq_tx_work;
+};
+
+struct isert_device {
+	int			cqs_used;
+	int			refcount;
+	int			cq_active_qps[ISERT_MAX_CQ];
+	struct ib_device	*ib_device;
+	struct ib_pd		*dev_pd;
+	struct ib_mr		*dev_mr;
+	struct ib_cq		*dev_rx_cq[ISERT_MAX_CQ];
+	struct ib_cq		*dev_tx_cq[ISERT_MAX_CQ];
+	struct isert_cq_desc	*cq_desc;
+	struct list_head	dev_node;
+};
+
+struct isert_np {
+	wait_queue_head_t	np_accept_wq;
+	struct rdma_cm_id	*np_cm_id;
+	struct mutex		np_accept_mutex;
+	struct list_head	np_accept_list;
+	struct completion	np_login_comp;
+};

drivers/infiniband/ulp/isert/isert_proto.h

+/* From iscsi_iser.h */
+
+struct iser_hdr {
+	u8	flags;
+	u8	rsvd[3];
+	__be32	write_stag; /* write rkey */
+	__be64	write_va;
+	__be32	read_stag;  /* read rkey */
+	__be64	read_va;
+} __packed;
+
+/*Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN  8192
+#define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
+#define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISERT_MAX_TX_MISC_PDUS	4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
+
+#define ISERT_MAX_RX_MISC_PDUS	6 /* NOOP_OUT(2), TEXT(1),         *
+				   * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */
+
+#define ISERT_QP_MAX_RECV_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX)
+
+#define ISERT_MIN_POSTED_RX	(ISCSI_DEF_XMIT_CMDS_MAX >> 2)
+
+#define ISERT_INFLIGHT_DATAOUTS	8
+
+#define ISERT_QP_MAX_REQ_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX *    \
+				(1 + ISERT_INFLIGHT_DATAOUTS) + \
+				ISERT_MAX_TX_MISC_PDUS	+ \
+				ISERT_MAX_RX_MISC_PDUS)
+
+#define ISER_RX_PAD_SIZE	(ISER_RECV_DATA_SEG_LEN + 4096 - \
+		(ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge)))
+
+#define ISER_VER	0x10
+#define ISER_WSV	0x08
+#define ISER_RSV	0x04
+#define ISCSI_CTRL	0x10
+#define ISER_HELLO	0x20
+#define ISER_HELLORPLY	0x30

drivers/scsi/qla2xxx/qla_target.c

@@ -2585,25 +2585,6 @@ static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
 	ha->tgt.tgt_ops->free_cmd(cmd);
 }
 
-/* ha->hardware_lock supposed to be held on entry */
-/* called via callback from qla2xxx */
-void qlt_ctio_completion(struct scsi_qla_host *vha, uint32_t handle)
-{
-	struct qla_hw_data *ha = vha->hw;
-	struct qla_tgt *tgt = ha->tgt.qla_tgt;
-
-	if (likely(tgt == NULL)) {
-		ql_dbg(ql_dbg_tgt, vha, 0xe021,
-		    "CTIO, but target mode not enabled"
-		    " (ha %d %p handle %#x)", vha->vp_idx, ha, handle);
-		return;
-	}
-
-	tgt->irq_cmd_count++;
-	qlt_do_ctio_completion(vha, handle, CTIO_SUCCESS, NULL);
-	tgt->irq_cmd_count--;
-}
-
 static inline int qlt_get_fcp_task_attr(struct scsi_qla_host *vha,
 	uint8_t task_codes)
 {

drivers/scsi/qla2xxx/qla_target.h

@@ -980,7 +980,6 @@ extern int qlt_xmit_response(struct qla_tgt_cmd *, int, uint8_t);
 extern void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_cmd(struct qla_tgt_cmd *cmd);
-extern void qlt_ctio_completion(struct scsi_qla_host *, uint32_t);
 extern void qlt_async_event(uint16_t, struct scsi_qla_host *, uint16_t *);
 extern void qlt_enable_vha(struct scsi_qla_host *);
 extern void qlt_vport_create(struct scsi_qla_host *, struct qla_hw_data *);

drivers/target/iscsi/Makefile

@@ -15,6 +15,7 @@ iscsi_target_mod-y +=		iscsi_target_parameters.o \
 				iscsi_target_util.o \
 				iscsi_target.o \
 				iscsi_target_configfs.o \
-				iscsi_target_stat.o
+				iscsi_target_stat.o \
+				iscsi_target_transport.o
 
 obj-$(CONFIG_ISCSI_TARGET)	+= iscsi_target_mod.o

drivers/target/iscsi/iscsi_target.h

@@ -16,11 +16,12 @@ extern int iscsit_reset_np_thread(struct iscsi_np *, struct iscsi_tpg_np *,
 				struct iscsi_portal_group *);
 extern int iscsit_del_np(struct iscsi_np *);
 extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *, struct iscsi_cmd *);
+extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
 extern int iscsit_logout_closesession(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_logout_closeconnection(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_send_async_msg(struct iscsi_conn *, u16, u8, u8);
-extern int iscsit_build_r2ts_for_cmd(struct iscsi_cmd *, struct iscsi_conn *, bool recovery);
+extern int iscsit_build_r2ts_for_cmd(struct iscsi_conn *, struct iscsi_cmd *, bool recovery);
 extern void iscsit_thread_get_cpumask(struct iscsi_conn *);
 extern int iscsi_target_tx_thread(void *);
 extern int iscsi_target_rx_thread(void *);

drivers/target/iscsi/iscsi_target_auth.c

@@ -49,32 +49,6 @@ static void chap_binaryhex_to_asciihex(char *dst, char *src, int src_len)
 	}
 }
 
-static void chap_set_random(char *data, int length)
-{
-	long r;
-	unsigned n;
-
-	while (length > 0) {
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 4);
-		n = r & 0x7;
-
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 5);
-		n = (n << 3) | (r & 0x7);
-
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 5);
-		n = (n << 2) | (r & 0x3);
-
-		*data++ = n;
-		length--;
-	}
-}
-
 static void chap_gen_challenge(
 	struct iscsi_conn *conn,
 	int caller,
@@ -86,7 +60,7 @@ static void chap_gen_challenge(
 
 	memset(challenge_asciihex, 0, CHAP_CHALLENGE_LENGTH * 2 + 1);
 
-	chap_set_random(chap->challenge, CHAP_CHALLENGE_LENGTH);
+	get_random_bytes(chap->challenge, CHAP_CHALLENGE_LENGTH);
 	chap_binaryhex_to_asciihex(challenge_asciihex, chap->challenge,
 				CHAP_CHALLENGE_LENGTH);
 	/*

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"
@@ -124,8 +125,87 @@ static ssize_t lio_target_np_store_sctp(
 
 TF_NP_BASE_ATTR(lio_target, sctp, S_IRUGO | S_IWUSR);
 
+static ssize_t lio_target_np_show_iser(
+	struct se_tpg_np *se_tpg_np,
+	char *page)
+{
+	struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
+				struct iscsi_tpg_np, se_tpg_np);
+	struct iscsi_tpg_np *tpg_np_iser;
+	ssize_t rb;
+
+	tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
+	if (tpg_np_iser)
+		rb = sprintf(page, "1\n");
+	else
+		rb = sprintf(page, "0\n");
+
+	return rb;
+}
+
+static ssize_t lio_target_np_store_iser(
+	struct se_tpg_np *se_tpg_np,
+	const char *page,
+	size_t count)
+{
+	struct iscsi_np *np;
+	struct iscsi_portal_group *tpg;
+	struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
+				struct iscsi_tpg_np, se_tpg_np);
+	struct iscsi_tpg_np *tpg_np_iser = NULL;
+	char *endptr;
+	u32 op;
+	int rc;
+
+	op = simple_strtoul(page, &endptr, 0);
+	if ((op != 1) && (op != 0)) {
+		pr_err("Illegal value for tpg_enable: %u\n", op);
+		return -EINVAL;
+	}
+	np = tpg_np->tpg_np;
+	if (!np) {
+		pr_err("Unable to locate struct iscsi_np from"
+				" struct iscsi_tpg_np\n");
+		return -EINVAL;
+	}
+
+	tpg = tpg_np->tpg;
+	if (iscsit_get_tpg(tpg) < 0)
+		return -EINVAL;
+
+	if (op) {
+		int rc = request_module("ib_isert");
+		if (rc != 0)
+			pr_warn("Unable to request_module for ib_isert\n");
+
+		tpg_np_iser = iscsit_tpg_add_network_portal(tpg, &np->np_sockaddr,
+				np->np_ip, tpg_np, ISCSI_INFINIBAND);
+		if (!tpg_np_iser || IS_ERR(tpg_np_iser))
+			goto out;
+	} else {
+		tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
+		if (!tpg_np_iser)
+			goto out;
+
+		rc = iscsit_tpg_del_network_portal(tpg, tpg_np_iser);
+		if (rc < 0)
+			goto out;
+	}
+
+	printk("lio_target_np_store_iser() done, op: %d\n", op);
+
+	iscsit_put_tpg(tpg);
+	return count;
+out:
+	iscsit_put_tpg(tpg);
+	return -EINVAL;
+}
+
+TF_NP_BASE_ATTR(lio_target, iser, S_IRUGO | S_IWUSR);
+
 static struct configfs_attribute *lio_target_portal_attrs[] = {
 	&lio_target_np_sctp.attr,
+	&lio_target_np_iser.attr,
 	NULL,
 };
 
@@ -1536,16 +1616,18 @@ 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;
 }
 
 static int lio_write_pending(struct se_cmd *se_cmd)
 {
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_conn *conn = cmd->conn;
 
 	if (!cmd->immediate_data && !cmd->unsolicited_data)
-		return iscsit_build_r2ts_for_cmd(cmd, cmd->conn, false);
+		return conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
 
 	return 0;
 }
@@ -1567,7 +1649,8 @@ 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;
 }
 
@@ -1696,11 +1779,17 @@ static void lio_set_default_node_attributes(struct se_node_acl *se_acl)
 	iscsit_set_default_node_attribues(acl);
 }
 
+static int lio_check_stop_free(struct se_cmd *se_cmd)
+{
+	return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
+}
+
 static void lio_release_cmd(struct se_cmd *se_cmd)
 {
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
 
-	iscsit_release_cmd(cmd);
+	pr_debug("Entering lio_release_cmd for se_cmd: %p\n", se_cmd);
+	cmd->release_cmd(cmd);
 }
 
 /* End functions for target_core_fabric_ops */
@@ -1740,6 +1829,7 @@ int iscsi_target_register_configfs(void)
 	fabric->tf_ops.tpg_alloc_fabric_acl = &lio_tpg_alloc_fabric_acl;
 	fabric->tf_ops.tpg_release_fabric_acl = &lio_tpg_release_fabric_acl;
 	fabric->tf_ops.tpg_get_inst_index = &lio_tpg_get_inst_index;
+	fabric->tf_ops.check_stop_free = &lio_check_stop_free,
 	fabric->tf_ops.release_cmd = &lio_release_cmd;
 	fabric->tf_ops.shutdown_session = &lio_tpg_shutdown_session;
 	fabric->tf_ops.close_session = &lio_tpg_close_session;

drivers/target/iscsi/iscsi_target_core.h

@@ -60,7 +60,7 @@
 
 #define ISCSI_IOV_DATA_BUFFER		5
 
-enum tpg_np_network_transport_table {
+enum iscsit_transport_type {
 	ISCSI_TCP				= 0,
 	ISCSI_SCTP_TCP				= 1,
 	ISCSI_SCTP_UDP				= 2,
@@ -244,6 +244,11 @@ struct iscsi_conn_ops {
 	u8	IFMarker;			/* [0,1] == [No,Yes] */
 	u32	OFMarkInt;			/* [1..65535] */
 	u32	IFMarkInt;			/* [1..65535] */
+	/*
+	 * iSER specific connection parameters
+	 */
+	u32	InitiatorRecvDataSegmentLength;	/* [512..2**24-1] */
+	u32	TargetRecvDataSegmentLength;	/* [512..2**24-1] */
 };
 
 struct iscsi_sess_ops {
@@ -265,6 +270,10 @@ struct iscsi_sess_ops {
 	u8	DataSequenceInOrder;		/* [0,1] == [No,Yes] */
 	u8	ErrorRecoveryLevel;		/* [0..2] */
 	u8	SessionType;			/* [0,1] == [Normal,Discovery]*/
+	/*
+	 * iSER specific session parameters
+	 */
+	u8	RDMAExtensions;			/* [0,1] == [No,Yes] */
 };
 
 struct iscsi_queue_req {
@@ -284,6 +293,7 @@ struct iscsi_data_count {
 };
 
 struct iscsi_param_list {
+	bool			iser;
 	struct list_head	param_list;
 	struct list_head	extra_response_list;
 };
@@ -475,6 +485,7 @@ struct iscsi_cmd {
 	u32			first_data_sg_off;
 	u32			kmapped_nents;
 	sense_reason_t		sense_reason;
+	void (*release_cmd)(struct iscsi_cmd *);
 }  ____cacheline_aligned;
 
 struct iscsi_tmr_req {
@@ -503,6 +514,7 @@ struct iscsi_conn {
 	u16			login_port;
 	u16			local_port;
 	int			net_size;
+	int			login_family;
 	u32			auth_id;
 	u32			conn_flags;
 	/* Used for iscsi_tx_login_rsp() */
@@ -562,9 +574,12 @@ struct iscsi_conn {
 	struct list_head	immed_queue_list;
 	struct list_head	response_queue_list;
 	struct iscsi_conn_ops	*conn_ops;
+	struct iscsi_login	*conn_login;
+	struct iscsit_transport *conn_transport;
 	struct iscsi_param_list	*param_list;
 	/* Used for per connection auth state machine */
 	void			*auth_protocol;
+	void			*context;
 	struct iscsi_login_thread_s *login_thread;
 	struct iscsi_portal_group *tpg;
 	/* Pointer to parent session */
@@ -663,6 +678,8 @@ struct iscsi_login {
 	u8 first_request;
 	u8 version_min;
 	u8 version_max;
+	u8 login_complete;
+	u8 login_failed;
 	char isid[6];
 	u32 cmd_sn;
 	itt_t init_task_tag;
@@ -670,10 +687,11 @@ struct iscsi_login {
 	u32 rsp_length;
 	u16 cid;
 	u16 tsih;
-	char *req;
-	char *rsp;
+	char req[ISCSI_HDR_LEN];
+	char rsp[ISCSI_HDR_LEN];
 	char *req_buf;
 	char *rsp_buf;
+	struct iscsi_conn *conn;
 } ____cacheline_aligned;
 
 struct iscsi_node_attrib {
@@ -754,6 +772,8 @@ struct iscsi_np {
 	struct task_struct	*np_thread;
 	struct timer_list	np_login_timer;
 	struct iscsi_portal_group *np_login_tpg;
+	void			*np_context;
+	struct iscsit_transport *np_transport;
 	struct list_head	np_list;
 } ____cacheline_aligned;
 

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);

drivers/target/iscsi/iscsi_target_erl1.c

@@ -22,6 +22,7 @@
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_seq_pdu_list.h"
@@ -53,6 +54,9 @@ int iscsit_dump_data_payload(
 	u32 length, padding, offset = 0, size;
 	struct kvec iov;
 
+	if (conn->sess->sess_ops->RDMAExtensions)
+		return 0;
+
 	length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
 
 	buf = kzalloc(length, GFP_ATOMIC);
@@ -919,6 +923,7 @@ int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
 {
 	struct se_cmd *se_cmd = &cmd->se_cmd;
+	struct iscsi_conn *conn = cmd->conn;
 	int lr = 0;
 
 	spin_lock_bh(&cmd->istate_lock);
@@ -981,7 +986,7 @@ int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
 					return 0;
 
 				iscsit_set_dataout_sequence_values(cmd);
-				iscsit_build_r2ts_for_cmd(cmd, cmd->conn, false);
+				conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
 			}
 			return 0;
 		}
@@ -999,10 +1004,7 @@ int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
 			if (transport_check_aborted_status(se_cmd, 1) != 0)
 				return 0;
 
-			iscsit_set_dataout_sequence_values(cmd);
-			spin_lock_bh(&cmd->dataout_timeout_lock);
-			iscsit_start_dataout_timer(cmd, cmd->conn);
-			spin_unlock_bh(&cmd->dataout_timeout_lock);
+			iscsit_set_unsoliticed_dataout(cmd);
 		}
 		return transport_handle_cdb_direct(&cmd->se_cmd);
 
@@ -1290,3 +1292,4 @@ void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd)
 			cmd->init_task_tag);
 	spin_unlock_bh(&cmd->dataout_timeout_lock);
 }
+EXPORT_SYMBOL(iscsit_stop_dataout_timer);

drivers/target/iscsi/iscsi_target_login.h

@@ -4,8 +4,14 @@
 extern int iscsi_login_setup_crypto(struct iscsi_conn *);
 extern int iscsi_check_for_session_reinstatement(struct iscsi_conn *);
 extern int iscsi_login_post_auth_non_zero_tsih(struct iscsi_conn *, u16, u32);
+extern int iscsit_setup_np(struct iscsi_np *,
+				struct __kernel_sockaddr_storage *);
 extern int iscsi_target_setup_login_socket(struct iscsi_np *,
 				struct __kernel_sockaddr_storage *);
+extern int iscsit_accept_np(struct iscsi_np *, struct iscsi_conn *);
+extern int iscsit_get_login_rx(struct iscsi_conn *, struct iscsi_login *);
+extern int iscsit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32);
+extern void iscsit_free_conn(struct iscsi_np *, struct iscsi_conn *);
 extern int iscsi_target_login_thread(void *);
 extern int iscsi_login_disable_FIM_keys(struct iscsi_param_list *, struct iscsi_conn *);
 

drivers/target/iscsi/iscsi_target_nego.c

@@ -22,6 +22,7 @@
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_parameters.h"
@@ -169,7 +170,7 @@ static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
 	kfree(conn->auth_protocol);
 }
 
-static int iscsi_target_check_login_request(
+int iscsi_target_check_login_request(
 	struct iscsi_conn *conn,
 	struct iscsi_login *login)
 {
@@ -200,8 +201,8 @@ static int iscsi_target_check_login_request(
 		return -1;
 	}
 
-	req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
-	req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
+	req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
+	req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 
 	if (req_csg != login->current_stage) {
 		pr_err("Initiator unexpectedly changed login stage"
@@ -352,11 +353,8 @@ static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_log
 
 	padding = ((-login->rsp_length) & 3);
 
-	if (iscsi_login_tx_data(
-			conn,
-			login->rsp,
-			login->rsp_buf,
-			login->rsp_length + padding) < 0)
+	if (conn->conn_transport->iscsit_put_login_tx(conn, login,
+					login->rsp_length + padding) < 0)
 		return -1;
 
 	login->rsp_length		= 0;
@@ -368,72 +366,12 @@ static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_log
 	return 0;
 }
 
-static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
-{
-	u32 padding = 0, payload_length;
-	struct iscsi_login_req *login_req;
-
-	if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
-		return -1;
-
-	login_req = (struct iscsi_login_req *) login->req;
-	payload_length			= ntoh24(login_req->dlength);
-
-	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
-		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
-		 login_req->flags, login_req->itt, login_req->cmdsn,
-		 login_req->exp_statsn, login_req->cid, payload_length);
-
-	if (iscsi_target_check_login_request(conn, login) < 0)
-		return -1;
-
-	padding = ((-payload_length) & 3);
-	memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
-
-	if (iscsi_login_rx_data(
-			conn,
-			login->req_buf,
-			payload_length + padding) < 0)
-		return -1;
-
-	return 0;
-}
-
 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 {
 	if (iscsi_target_do_tx_login_io(conn, login) < 0)
 		return -1;
 
-	if (iscsi_target_do_rx_login_io(conn, login) < 0)
-		return -1;
-
-	return 0;
-}
-
-static int iscsi_target_get_initial_payload(
-	struct iscsi_conn *conn,
-	struct iscsi_login *login)
-{
-	u32 padding = 0, payload_length;
-	struct iscsi_login_req *login_req;
-
-	login_req = (struct iscsi_login_req *) login->req;
-	payload_length = ntoh24(login_req->dlength);
-
-	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
-		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
-		login_req->flags, login_req->itt, login_req->cmdsn,
-		login_req->exp_statsn, payload_length);
-
-	if (iscsi_target_check_login_request(conn, login) < 0)
-		return -1;
-
-	padding = ((-payload_length) & 3);
-
-	if (iscsi_login_rx_data(
-			conn,
-			login->req_buf,
-			payload_length + padding) < 0)
+	if (conn->conn_transport->iscsit_get_login_rx(conn, login) < 0)
 		return -1;
 
 	return 0;
@@ -681,9 +619,9 @@ static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *lo
 			return -1;
 		}
 
-		switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
+		switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 		case 0:
-			login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
+			login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 			if (iscsi_target_handle_csg_zero(conn, login) < 0)
 				return -1;
 			break;
@@ -693,6 +631,7 @@ static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *lo
 				return -1;
 			if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 				login->tsih = conn->sess->tsih;
+				login->login_complete = 1;
 				if (iscsi_target_do_tx_login_io(conn,
 						login) < 0)
 					return -1;
@@ -702,8 +641,7 @@ static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *lo
 		default:
 			pr_err("Illegal CSG: %d received from"
 				" Initiator, protocol error.\n",
-				(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
-				>> 2);
+				ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
 			break;
 		}
 
@@ -737,7 +675,7 @@ static void iscsi_initiatorname_tolower(
 /*
  * Processes the first Login Request..
  */
-static int iscsi_target_locate_portal(
+int iscsi_target_locate_portal(
 	struct iscsi_np *np,
 	struct iscsi_conn *conn,
 	struct iscsi_login *login)
@@ -753,22 +691,6 @@ static int iscsi_target_locate_portal(
 	login_req = (struct iscsi_login_req *) login->req;
 	payload_length = ntoh24(login_req->dlength);
 
-	login->first_request	= 1;
-	login->leading_connection = (!login_req->tsih) ? 1 : 0;
-	login->current_stage	=
-		(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
-	login->version_min	= login_req->min_version;
-	login->version_max	= login_req->max_version;
-	memcpy(login->isid, login_req->isid, 6);
-	login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
-	login->init_task_tag	= login_req->itt;
-	login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
-	login->cid		= be16_to_cpu(login_req->cid);
-	login->tsih		= be16_to_cpu(login_req->tsih);
-
-	if (iscsi_target_get_initial_payload(conn, login) < 0)
-		return -1;
-
 	tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
 	if (!tmpbuf) {
 		pr_err("Unable to allocate memory for tmpbuf.\n");
@@ -800,6 +722,8 @@ static int iscsi_target_locate_portal(
 		start += strlen(key) + strlen(value) + 2;
 	}
 
+	printk("i_buf: %s, s_buf: %s, t_buf: %s\n", i_buf, s_buf, t_buf);
+
 	/*
 	 * See 5.3.  Login Phase.
 	 */
@@ -958,100 +882,30 @@ static int iscsi_target_locate_portal(
 	return ret;
 }
 
-struct iscsi_login *iscsi_target_init_negotiation(
-	struct iscsi_np *np,
-	struct iscsi_conn *conn,
-	char *login_pdu)
-{
-	struct iscsi_login *login;
-
-	login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
-	if (!login) {
-		pr_err("Unable to allocate memory for struct iscsi_login.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		return NULL;
-	}
-
-	login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL);
-	if (!login->req) {
-		pr_err("Unable to allocate memory for Login Request.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		goto out;
-	}
-
-	login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
-	if (!login->req_buf) {
-		pr_err("Unable to allocate memory for response buffer.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		goto out;
-	}
-	/*
-	 * SessionType: Discovery
-	 *
-	 *	Locates Default Portal
-	 *
-	 * SessionType: Normal
-	 *
-	 *	Locates Target Portal from NP -> Target IQN
-	 */
-	if (iscsi_target_locate_portal(np, conn, login) < 0) {
-		goto out;
-	}
-
-	return login;
-out:
-	kfree(login->req);
-	kfree(login->req_buf);
-	kfree(login);
-
-	return NULL;
-}
-
 int iscsi_target_start_negotiation(
 	struct iscsi_login *login,
 	struct iscsi_conn *conn)
 {
-	int ret = -1;
-
-	login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
-	if (!login->rsp) {
-		pr_err("Unable to allocate memory for"
-				" Login Response.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		ret = -1;
-		goto out;
-	}
-
-	login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
-	if (!login->rsp_buf) {
-		pr_err("Unable to allocate memory for"
-			" request buffer.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		ret = -1;
-		goto out;
-	}
+	int ret;
 
 	ret = iscsi_target_do_login(conn, login);
-out:
 	if (ret != 0)
 		iscsi_remove_failed_auth_entry(conn);
 
-	iscsi_target_nego_release(login, conn);
+	iscsi_target_nego_release(conn);
 	return ret;
 }
 
-void iscsi_target_nego_release(
-	struct iscsi_login *login,
-	struct iscsi_conn *conn)
+void iscsi_target_nego_release(struct iscsi_conn *conn)
 {
-	kfree(login->req);
-	kfree(login->rsp);
+	struct iscsi_login *login = conn->conn_login;
+
+	if (!login)
+		return;
+
 	kfree(login->req_buf);
 	kfree(login->rsp_buf);
 	kfree(login);
+
+	conn->conn_login = NULL;
 }

drivers/target/iscsi/iscsi_target_util.h

@@ -8,6 +8,7 @@ extern struct iscsi_r2t *iscsit_get_r2t_for_eos(struct iscsi_cmd *, u32, u32);
 extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *);
 extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *);
 extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *);
+extern struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *);