From: Alex Aizman <itn780@yahoo.com>
To: linux-scsi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: [ANNOUNCE 1/6] Open-iSCSI High-Performance Initiator for Linux
Date: Sun, 06 Mar 2005 23:04:51 -0800 [thread overview]
Message-ID: <422BFD13.1060908@yahoo.com> (raw)
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SCSI LLDD consists of 3 files:
- iscsi_if.c (iSCSI open interface over netlink);
- iscsi_tcp.[ch] (iSCSI transport over TCP/IP).
Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
[-- Attachment #2: open-iscsi-scsi.patch --]
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diff -Nru --exclude Kconfig --exclude Makefile linux-2.6.11.orig/drivers/scsi/iscsi_if.c linux-2.6.11.dima/drivers/scsi/iscsi_if.c
--- linux-2.6.11.orig/drivers/scsi/iscsi_if.c 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.11.dima/drivers/scsi/iscsi_if.c 2005-03-04 17:50:11.130414609 -0800
@@ -0,0 +1,257 @@
+/*
+ * iSCSI Initiator Kernel/User Interface
+ *
+ * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@googlegroups.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#include <linux/module.h>
+#include <net/tcp.h>
+#include <scsi/iscsi_if.h>
+#include <scsi/iscsi_ifev.h>
+
+MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+ "Alex Aizman <itn780@yahoo.com>");
+MODULE_DESCRIPTION("iSCSI Open Interface");
+MODULE_LICENSE("GPL");
+
+static struct iscsi_transport *transport_table[ISCSI_TRANSPORT_MAX];
+static struct sock *nls;
+static int daemon_pid;
+
+int
+iscsi_control_recv_pdu(iscsi_cnx_h cp_cnx, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ char *pdu;
+ int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
+ data_size);
+
+ skb = alloc_skb(len, gfp_any());
+ if (!skb) {
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)));
+ ev = NLMSG_DATA(nlh);
+ memset(ev, 0, sizeof(*ev));
+ ev->transport_id = 0;
+ ev->type = ISCSI_KEVENT_RECV_PDU;
+ ev->r.recv_req.cnx_handle = cp_cnx;
+ pdu = (char*)ev + sizeof(*ev);
+ memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
+ memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
+ skb_get(skb);
+ netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_control_recv_pdu);
+
+void
+iscsi_control_cnx_error(iscsi_cnx_h cp_cnx, iscsi_err_e error)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ int len = NLMSG_SPACE(sizeof(*ev));
+
+ skb = alloc_skb(len, gfp_any());
+ if (!skb) {
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)));
+ ev = NLMSG_DATA(nlh);
+ ev->transport_id = 0;
+ ev->type = ISCSI_KEVENT_CNX_ERROR;
+ ev->r.cnxerror.error = error;
+ ev->r.cnxerror.cnx_handle = cp_cnx;
+ skb_get(skb);
+ netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
+}
+EXPORT_SYMBOL_GPL(iscsi_control_cnx_error);
+
+static struct iscsi_transport*
+iscsi_if_transport_lookup(int id)
+{
+ /* FIXME: implement transport's container */
+ if (id != 0)
+ return NULL;
+ return transport_table[id];
+}
+
+static int
+iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
+ void *payload, int size)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ int len = NLMSG_SPACE(size);
+ int flags = multi ? NLM_F_MULTI : 0;
+ int t = done ? NLMSG_DONE : type;
+
+ skb = alloc_skb(len, GFP_KERNEL);
+ if (!skb) {
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)));
+ nlh->nlmsg_flags = flags;
+ memcpy(NLMSG_DATA(nlh), payload, size);
+ netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
+ return 0;
+}
+
+static int
+iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int err = 0;
+ struct iscsi_transport *transport;
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+
+ if ((transport = iscsi_if_transport_lookup(ev->transport_id)) == NULL)
+ return -EEXIST;
+
+ daemon_pid = NETLINK_CREDS(skb)->pid;
+
+ switch (nlh->nlmsg_type) {
+ case ISCSI_UEVENT_CREATE_SESSION:
+ ev->r.c_session_ret.handle = transport->create_session(
+ ev->u.c_session.session_handle,
+ ev->u.c_session.initial_cmdsn, &ev->r.c_session_ret.sid);
+ break;
+ case ISCSI_UEVENT_DESTROY_SESSION:
+ transport->destroy_session(
+ ev->u.d_session.session_handle);
+ break;
+ case ISCSI_UEVENT_CREATE_CNX:
+ ev->r.handle = transport->create_cnx(
+ ev->u.c_cnx.session_handle,
+ ev->u.c_cnx.cnx_handle,
+ ev->u.c_cnx.cid);
+ break;
+ case ISCSI_UEVENT_DESTROY_CNX:
+ transport->destroy_cnx(ev->u.d_cnx.cnx_handle);
+ break;
+ case ISCSI_UEVENT_BIND_CNX:
+ ev->r.retcode = transport->bind_cnx(
+ ev->u.b_cnx.session_handle,
+ ev->u.b_cnx.cnx_handle,
+ ev->u.b_cnx.transport_fd,
+ ev->u.b_cnx.is_leading);
+ break;
+ case ISCSI_UEVENT_SET_PARAM:
+ ev->r.retcode = transport->set_param(
+ ev->u.set_param.cnx_handle,
+ ev->u.set_param.param, ev->u.set_param.value);
+ break;
+ case ISCSI_UEVENT_START_CNX:
+ ev->r.retcode = transport->start_cnx(
+ ev->u.start_cnx.cnx_handle);
+ break;
+ case ISCSI_UEVENT_STOP_CNX:
+ transport->stop_cnx(
+ ev->u.stop_cnx.cnx_handle);
+ break;
+ case ISCSI_UEVENT_SEND_PDU:
+ ev->r.retcode = transport->send_pdu(
+ ev->u.send_pdu.cnx_handle,
+ (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
+ (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
+ ev->u.send_pdu.data_size);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
+ * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
+ * discarded silently. */
+static void
+iscsi_if_rx(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ while (skb->len >= NLMSG_SPACE(0)) {
+ int err;
+ uint32_t rlen;
+ struct nlmsghdr *nlh;
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh) ||
+ skb->len < nlh->nlmsg_len) {
+ break;
+ }
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ err = iscsi_if_recv_msg(skb, nlh);
+ if (err) {
+ netlink_ack(skb, nlh, -err);
+ } else {
+ u32 seq = nlh->nlmsg_seq;
+ u32 pid = NETLINK_CREDS(skb)->pid;
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ err = iscsi_if_send_reply(pid, seq,
+ nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
+ if (err)
+ netlink_ack(skb, nlh, -err);
+ }
+ skb_pull(skb, rlen);
+ }
+ kfree_skb(skb);
+ }
+}
+
+int iscsi_register_transport(struct iscsi_transport *ops, int id)
+{
+ transport_table[id] = ops;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_register_transport);
+
+void iscsi_unregister_transport(int id)
+{
+ transport_table[id] = NULL;
+}
+EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
+
+int __init iscsi_if_init(void)
+{
+ printk(KERN_INFO "Open-iSCSI Interface, version "
+ ISCSI_VERSION_STR " variant (" ISCSI_DATE_STR ")\n");
+
+ nls = netlink_kernel_create(NETLINK_ISCSI, iscsi_if_rx);
+ if (nls == NULL)
+ return -ENOBUFS;
+
+ return 0;
+}
+
+static void __exit
+iscsi_if_exit(void)
+{
+ sock_release(nls->sk_socket);
+}
+
+module_init(iscsi_if_init);
+module_exit(iscsi_if_exit);
diff -Nru --exclude Kconfig --exclude Makefile linux-2.6.11.orig/drivers/scsi/iscsi_tcp.c linux-2.6.11.dima/drivers/scsi/iscsi_tcp.c
--- linux-2.6.11.orig/drivers/scsi/iscsi_tcp.c 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.11.dima/drivers/scsi/iscsi_tcp.c 2005-03-04 17:50:11.131414493 -0800
@@ -0,0 +1,2669 @@
+/*
+ * iSCSI Initiator over TCP/IP Data-Path
+ *
+ * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@googlegroups.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ *
+ * Credits:
+ * Christoph Hellwig : For reviewing the code, for comments and suggestions.
+ * Mike Christie : For reviewing the code, for comments and suggestions.
+ */
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/inet.h>
+#include <linux/blkdev.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <linux/kfifo.h>
+#include <linux/scatterlist.h>
+#include <net/tcp.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_request.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+
+#include "iscsi_tcp.h"
+
+MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+ "Alex Aizman <itn780@yahoo.com>");
+MODULE_DESCRIPTION("iSCSI/TCP data-path");
+MODULE_LICENSE("GPL");
+
+/* #define DEBUG_TCP */
+/* #define DEBUG_SCSI */
+/* #define DEBUG_ASSERT */
+
+#ifdef DEBUG_TCP
+#define debug_tcp(fmt...) printk("tcp: " fmt)
+#else
+#define debug_tcp(fmt...)
+#endif
+
+#ifdef DEBUG_SCSI
+#define debug_scsi(fmt...) printk("scsi: " fmt)
+#else
+#define debug_scsi(fmt...)
+#endif
+
+#ifndef DEBUG_ASSERT
+#ifdef BUG_ON
+#undef BUG_ON
+#endif
+#define BUG_ON(expr)
+#endif
+
+/* global data */
+static kmem_cache_t *taskcache;
+
+static inline void
+iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
+{
+ sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
+ ibuf->sent = 0;
+}
+
+static inline void
+iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
+{
+ ibuf->sg.page = sg->page;
+ ibuf->sg.offset = sg->offset;
+ ibuf->sg.length = sg->length;
+ ibuf->sent = 0;
+}
+
+static inline int
+iscsi_buf_left(struct iscsi_buf *ibuf)
+{
+ int rc;
+
+ rc = ibuf->sg.length - ibuf->sent;
+ BUG_ON(rc < 0);
+ return rc;
+}
+
+static inline void
+iscsi_buf_init_hdr(struct iscsi_conn *conn, struct iscsi_buf *ibuf,
+ char *vbuf, u8 *crc)
+{
+ iscsi_buf_init_virt(ibuf, vbuf, sizeof(struct iscsi_hdr));
+ if (conn->hdrdgst_en) {
+ crypto_digest_init(conn->tx_tfm);
+ crypto_digest_update(conn->tx_tfm, &ibuf->sg, 1);
+ crypto_digest_final(conn->tx_tfm, crc);
+ ibuf->sg.length += sizeof(uint32_t);
+ }
+}
+
+#define iscsi_conn_get(rdd) (struct iscsi_conn*)(rdd)->arg.data
+#define iscsi_conn_set(rdd, conn) (rdd)->arg.data = conn
+
+static int
+iscsi_hdr_extract(struct iscsi_conn *conn)
+{
+ struct sk_buff *skb = conn->in.skb;
+
+ if (conn->in.copy >= conn->hdr_size &&
+ conn->in_progress != IN_PROGRESS_HEADER_GATHER) {
+ /*
+ * Zero-copy PDU Header: using connection context
+ * to store header pointer.
+ */
+ if (skb_shinfo(skb)->frag_list == NULL &&
+ !skb_shinfo(skb)->nr_frags) {
+ conn->in.hdr = (struct iscsi_hdr *)
+ ((char*)skb->data + conn->in.offset);
+ } else {
+ /* ignoring return code since we checked
+ * in.copy before */
+ skb_copy_bits(skb, conn->in.offset,
+ &conn->hdr, conn->hdr_size);
+ conn->in.hdr = &conn->hdr;
+ }
+ conn->in.offset += conn->hdr_size;
+ conn->in.copy -= conn->hdr_size;
+ conn->in.hdr_offset = 0;
+ } else {
+ int copylen;
+
+ /*
+ * PDU header scattered accross SKB's,
+ * copying it... This'll happen quite rarely.
+ */
+ if (conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
+ skb_copy_bits(skb, conn->in.offset,
+ &conn->hdr, conn->in.copy);
+ conn->in_progress = IN_PROGRESS_HEADER_GATHER;
+ conn->in.hdr_offset = conn->in.copy;
+ conn->in.offset += conn->in.copy;
+ conn->in.copy = 0;
+ debug_tcp("PDU gather #1 %d bytes!\n",
+ conn->in.hdr_offset);
+ return -EAGAIN;
+ }
+
+ copylen = conn->hdr_size - conn->in.hdr_offset;
+ if (copylen > conn->in.copy) {
+ printk("iSCSI: PDU gather failed! "
+ "copylen %d conn->in.copy %d\n",
+ copylen, conn->in.copy);
+ iscsi_control_cnx_error(conn->handle,
+ ISCSI_ERR_CNX_FAILED);
+ return 0;
+ }
+ debug_tcp("PDU gather #2 %d bytes!\n", copylen);
+
+ skb_copy_bits(skb, conn->in.offset,
+ (char*)&conn->hdr + conn->in.hdr_offset, copylen);
+ conn->in.offset += copylen;
+ conn->in.copy -= copylen;
+ conn->in.hdr_offset = 0;
+ conn->in.hdr = &conn->hdr;
+ conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ }
+
+ return 0;
+}
+
+static void
+iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct scsi_cmnd *sc = ctask->sc;
+ struct iscsi_session *session = conn->session;
+
+ spin_lock(&session->lock);
+ if (ctask->in_progress == IN_PROGRESS_IDLE) {
+ spin_unlock(&session->lock);
+ return;
+ }
+ if (sc->sc_data_direction == DMA_TO_DEVICE) {
+ struct iscsi_data_task *dtask, *n;
+ /* WRITE: cleanup Data-Out's if any */
+ spin_lock(&conn->lock);
+ list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
+ list_del(&dtask->item);
+ mempool_free(dtask, ctask->datapool);
+ }
+ spin_unlock(&conn->lock);
+ }
+ ctask->in_progress = IN_PROGRESS_IDLE;
+ __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
+ spin_unlock(&session->lock);
+}
+
+/*
+ * SCSI Command Response processing
+ */
+static int
+iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ int rc = 0;
+ struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
+ struct iscsi_session *session = conn->session;
+ struct scsi_cmnd *sc = ctask->sc;
+ int max_cmdsn = ntohl(rhdr->max_cmdsn);
+ int exp_cmdsn = ntohl(rhdr->exp_cmdsn);
+
+ if (max_cmdsn < exp_cmdsn - 1) {
+ rc = ISCSI_ERR_MAX_CMDSN;
+ sc->result = (DID_ERROR << 16);
+ goto fault;
+ }
+ session->max_cmdsn = max_cmdsn;
+ session->exp_cmdsn = exp_cmdsn;
+ conn->exp_statsn = ntohl(rhdr->statsn) + 1;
+
+ sc->result = (DID_OK << 16) | rhdr->cmd_status;
+
+ if (rhdr->response == ISCSI_STATUS_CMD_COMPLETED) {
+ if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION &&
+ conn->senselen) {
+ int sensecopy = min(conn->senselen,
+ SCSI_SENSE_BUFFERSIZE);
+ memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
+ debug_scsi("copied %d bytes of sense\n", sensecopy);
+ }
+
+ if (sc->sc_data_direction != DMA_TO_DEVICE ) {
+ if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
+ int res_count = ntohl(rhdr->residual_count);
+ if (res_count > 0 &&
+ res_count <= sc->request_bufflen) {
+ sc->resid = res_count;
+ } else {
+ sc->result = (DID_BAD_TARGET << 16) |
+ rhdr->cmd_status;
+ rc = ISCSI_ERR_BAD_TARGET;
+ goto fault;
+ }
+ } else if (rhdr->flags& ISCSI_FLAG_CMD_BIDI_UNDERFLOW) {
+ sc->result = (DID_BAD_TARGET << 16) |
+ rhdr->cmd_status;
+ rc = ISCSI_ERR_BAD_TARGET;
+ goto fault;
+ } else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
+ sc->resid = ntohl(rhdr->residual_count);
+ }
+ }
+ } else {
+ sc->result = (DID_ERROR << 16);
+ rc = ISCSI_ERR_BAD_TARGET;
+ goto fault;
+ }
+
+fault:
+ debug_scsi("done [sc %lx res %d itt 0x%x]\n",
+ (long)sc, sc->result, ctask->itt);
+ iscsi_ctask_cleanup(conn, ctask);
+ sc->scsi_done(sc);
+ return rc;
+}
+
+/*
+ * SCSI Data-In Response processing
+ */
+static int
+iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
+ struct iscsi_session *session = conn->session;
+ int datasn = ntohl(rhdr->datasn);
+ int max_cmdsn = ntohl(rhdr->max_cmdsn);
+ int exp_cmdsn = ntohl(rhdr->exp_cmdsn);
+
+ /*
+ * setup Data-In byte counter (gets decremented..)
+ */
+ ctask->data_count = conn->in.datalen;
+
+ if (conn->in.datalen == 0)
+ return 0;
+
+ if (max_cmdsn < exp_cmdsn -1)
+ return ISCSI_ERR_MAX_CMDSN;
+
+ session->max_cmdsn = max_cmdsn;
+ session->exp_cmdsn = exp_cmdsn;
+
+ if (ctask->datasn != datasn)
+ return ISCSI_ERR_DATASN;
+
+ ctask->datasn++;
+
+ ctask->data_offset = ntohl(rhdr->offset);
+ if (ctask->data_offset + conn->in.datalen > ctask->total_length) {
+ return ISCSI_ERR_DATA_OFFSET;
+ }
+
+ if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
+ struct scsi_cmnd *sc = ctask->sc;
+ conn->exp_statsn = ntohl(rhdr->statsn) + 1;
+ if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
+ int res_count = ntohl(rhdr->residual_count);
+ if (res_count > 0 &&
+ res_count <= sc->request_bufflen) {
+ sc->resid = res_count;
+ } else {
+ sc->result = (DID_BAD_TARGET << 16) |
+ rhdr->cmd_status;
+ return ISCSI_ERR_BAD_TARGET;
+ }
+ } else if (rhdr->flags& ISCSI_FLAG_CMD_BIDI_UNDERFLOW) {
+ sc->result = (DID_BAD_TARGET << 16) |
+ rhdr->cmd_status;
+ return ISCSI_ERR_BAD_TARGET;
+ } else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
+ sc->resid = ntohl(rhdr->residual_count);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * iscsi_solicit_data_init - initialize first Data-Out
+ *
+ * Initialize first Data-Out within this R2T sequence and finds
+ * proper data_offset within this SCSI command.
+ *
+ * This function is called with connection lock taken.
+ */
+static void
+iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ struct iscsi_r2t_info *r2t)
+{
+ struct iscsi_data *hdr;
+ struct iscsi_data_task *dtask;
+ struct scsi_cmnd *sc = ctask->sc;
+
+ dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
+ hdr = &dtask->hdr;
+ hdr->rsvd2[0] = hdr->rsvd2[1] = hdr->rsvd3 =
+ hdr->rsvd4 = hdr->rsvd5 = hdr->rsvd6 = 0;
+ hdr->ttt = r2t->ttt;
+ hdr->datasn = htonl(r2t->solicit_datasn);
+ r2t->solicit_datasn++;
+ hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
+ memset(hdr->lun, 0, 8);
+ hdr->lun[1] = ctask->hdr.lun[1];
+ hdr->itt = ctask->hdr.itt;
+ hdr->exp_statsn = r2t->exp_statsn;
+ hdr->offset = htonl(r2t->data_offset);
+ if (r2t->data_length > conn->max_xmit_dlength) {
+ hton24(hdr->dlength, conn->max_xmit_dlength);
+ r2t->data_count = conn->max_xmit_dlength;
+ hdr->flags = 0;
+ } else {
+ hton24(hdr->dlength, r2t->data_length);
+ r2t->data_count = r2t->data_length;
+ hdr->flags = ISCSI_FLAG_CMD_FINAL;
+ }
+
+ r2t->sent = 0;
+
+ iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
+ (u8 *)dtask->hdrext);
+
+ if (sc->use_sg) {
+ int i, sg_count = 0;
+ struct scatterlist *sg = sc->request_buffer;
+
+ r2t->sg = NULL;
+ for (i = 0; i < sc->use_sg; i++, sg += 1) {
+ /* FIXME: prefetch ? */
+ if (sg_count + sg->length > r2t->data_offset) {
+ int page_offset;
+
+ /* sg page found! */
+
+ /* offset within this page */
+ page_offset = r2t->data_offset - sg_count;
+
+ /* fill in this buffer */
+ iscsi_buf_init_sg(&r2t->sendbuf, sg);
+ r2t->sendbuf.sg.offset += page_offset;
+ r2t->sendbuf.sg.length -= page_offset;
+
+ /* xmit logic will continue with next one */
+ r2t->sg = sg + 1;
+ break;
+ }
+ sg_count += sg->length;
+ }
+ BUG_ON(r2t->sg == NULL);
+ } else {
+ iscsi_buf_init_virt(&ctask->sendbuf,
+ (char*)sc->request_buffer + r2t->data_offset,
+ r2t->data_count);
+ }
+
+ list_add(&dtask->item, &ctask->dataqueue);
+}
+
+/*
+ * iSCSI R2T Response processing
+ */
+static int
+iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_r2t_info *r2t;
+ struct iscsi_session *session = conn->session;
+ struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
+ uint32_t max_cmdsn = ntohl(rhdr->max_cmdsn);
+ uint32_t exp_cmdsn = ntohl(rhdr->exp_cmdsn);
+ int r2tsn = ntohl(rhdr->r2tsn);
+
+ if (conn->in.ahslen)
+ return ISCSI_ERR_AHSLEN;
+
+ if (conn->in.datalen)
+ return ISCSI_ERR_DATALEN;
+
+ if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
+ return ISCSI_ERR_R2TSN;
+
+ if (max_cmdsn < exp_cmdsn - 1)
+ return ISCSI_ERR_MAX_CMDSN;
+
+ session->max_cmdsn = max_cmdsn;
+ session->exp_cmdsn = exp_cmdsn;
+
+ /* FIXME: use R2TSN to detect missing R2T */
+
+ /* fill-in new R2T associated with the task */
+ if (!__kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*))) {
+ return ISCSI_ERR_PROTO;
+ }
+ r2t->exp_statsn = rhdr->statsn;
+ r2t->data_length = ntohl(rhdr->data_length);
+ if (r2t->data_length == 0 ||
+ r2t->data_length > session->max_burst) {
+ return ISCSI_ERR_DATALEN;
+ }
+ if (ctask->hdr.lun[1] != rhdr->lun[1]) {
+ return ISCSI_ERR_LUN;
+ }
+ r2t->data_offset = ntohl(rhdr->data_offset);
+ if (r2t->data_offset + r2t->data_length > ctask->total_length) {
+ return ISCSI_ERR_DATALEN;
+ }
+ r2t->ttt = rhdr->ttt; /* no flip */
+ r2t->solicit_datasn = 0;
+
+ iscsi_solicit_data_init(conn, ctask, r2t);
+
+ ctask->exp_r2tsn = r2tsn + 1;
+ ctask->xmstate |= XMSTATE_SOL_HDR;
+ __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
+ __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
+
+ schedule_work(&conn->xmitwork);
+ return 0;
+}
+
+static int
+iscsi_hdr_recv(struct iscsi_conn *conn)
+{
+ int rc = 0;
+ struct iscsi_hdr *hdr;
+ struct iscsi_cmd_task *ctask;
+ struct iscsi_session *session = conn->session;
+ uint32_t cdgst, rdgst = 0;
+
+ hdr = conn->in.hdr;
+
+ /* verify PDU length */
+ conn->in.datalen = ntoh24(hdr->dlength);
+ if (conn->in.datalen > conn->max_recv_dlength) {
+ printk("iSCSI: datalen %d > %d\n", conn->in.datalen,
+ conn->max_recv_dlength);
+ iscsi_control_cnx_error(conn->handle, ISCSI_ERR_CNX_FAILED);
+ return 0;
+ }
+ conn->data_copied = 0;
+
+ /* read AHS */
+ conn->in.ahslen = hdr->hlength*(4*sizeof(__u16));
+ conn->in.offset += conn->in.ahslen;
+ conn->in.copy -= conn->in.ahslen;
+ if (conn->in.copy < 0) {
+ printk("iSCSI: can't handle AHS with length %d bytes\n",
+ conn->in.ahslen);
+ iscsi_control_cnx_error(conn->handle, ISCSI_ERR_CNX_FAILED);
+ return 0;
+ }
+
+ /* calculate padding */
+ conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
+ if (conn->in.padding) {
+ conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
+ debug_scsi("padding %d bytes\n", conn->in.padding);
+ }
+
+ if (conn->hdrdgst_en) {
+ struct scatterlist sg;
+
+ sg_init_one(&sg, (u8 *)hdr,
+ sizeof(struct iscsi_hdr) + conn->in.ahslen);
+ crypto_digest_init(conn->rx_tfm);
+ crypto_digest_update(conn->rx_tfm, &sg, 1);
+ crypto_digest_final(conn->rx_tfm, (u8 *)&cdgst);
+ rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
+ conn->in.ahslen);
+ }
+
+ /* save opcode & itt for later */
+ conn->in.opcode = hdr->opcode;
+ conn->in.itt = ntohl(hdr->itt);
+
+ debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
+ hdr->opcode, conn->in.offset, conn->in.copy,
+ conn->in.ahslen, conn->in.datalen);
+
+ if (conn->in.itt < session->cmds_max) {
+ if (conn->hdrdgst_en && cdgst != rdgst) {
+ printk("iSCSI: itt %x: hdrdgst error recv 0x%x "
+ "calc 0x%x\n", conn->in.itt, rdgst, cdgst);
+ iscsi_control_cnx_error(conn->handle,
+ ISCSI_ERR_HDR_DGST);
+ return 0;
+ }
+
+ ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
+ BUG_ON(ctask != (void*)ctask->sc->SCp.ptr);
+ conn->in.ctask = ctask;
+
+ debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
+ hdr->opcode, conn->id, (long)ctask->sc, ctask->itt,
+ conn->in.datalen);
+
+ switch(conn->in.opcode) {
+ case ISCSI_OP_SCSI_CMD_RSP:
+ if (ctask->in_progress == IN_PROGRESS_READ) {
+ if (!conn->in.datalen) {
+ rc = iscsi_cmd_rsp(conn, ctask);
+ } else {
+ /* got sense or response data;
+ * copying PDU Header to the
+ * connection's header
+ * placeholder */
+ memcpy(&conn->hdr, hdr,
+ sizeof(struct iscsi_hdr));
+ }
+ } else if (ctask->in_progress == IN_PROGRESS_WRITE) {
+ rc = iscsi_cmd_rsp(conn, ctask);
+ }
+ break;
+ case ISCSI_OP_SCSI_DATA_IN:
+ /* save flags for non-exceptional status */
+ conn->in.flags = hdr->flags;
+ /* save cmd_status for sense data */
+ conn->in.cmd_status =
+ ((struct iscsi_data_rsp*)hdr)->cmd_status;
+ rc = iscsi_data_rsp(conn, ctask);
+ break;
+ case ISCSI_OP_R2T:
+ rc = iscsi_r2t_rsp(conn, ctask);
+ break;
+ case ISCSI_OP_NOOP_IN:
+ case ISCSI_OP_TEXT_RSP:
+ case ISCSI_OP_LOGOUT_RSP:
+ case ISCSI_OP_ASYNC_EVENT:
+ case ISCSI_OP_REJECT:
+ /* update ExpStatSN */
+ conn->exp_statsn = ntohl(hdr->statsn) + 1;
+ if (!conn->in.datalen) {
+ struct iscsi_mgmt_task *mtask;
+
+ rc = iscsi_control_recv_pdu(
+ conn->handle, hdr, NULL, 0);
+ mtask = (struct iscsi_mgmt_task *)
+ session->imm_cmds[conn->in.itt -
+ ISCSI_IMM_ITT_OFFSET];
+ if (conn->login_mtask != mtask) {
+ spin_lock(&session->lock);
+ __kfifo_put(session->immpool.queue,
+ (void*)&mtask, sizeof(void*));
+ spin_unlock(&session->lock);
+ }
+ }
+ break;
+ default:
+ rc = ISCSI_ERR_BAD_OPCODE;
+ break;
+ }
+ } else if (conn->in.itt >= ISCSI_IMM_ITT_OFFSET &&
+ conn->in.itt < ISCSI_IMM_ITT_OFFSET +
+ session->imm_max) {
+ struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
+ session->imm_cmds[conn->in.itt -
+ ISCSI_IMM_ITT_OFFSET];
+
+ debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
+ conn->in.opcode, conn->id, mtask->itt,
+ conn->in.datalen);
+
+ switch(conn->in.opcode) {
+ case ISCSI_OP_LOGIN_RSP:
+ case ISCSI_OP_TEXT_RSP:
+ if (!conn->in.datalen) {
+ rc = iscsi_control_recv_pdu(
+ conn->handle, hdr, NULL, 0);
+ if (conn->login_mtask != mtask) {
+ spin_lock(&session->lock);
+ __kfifo_put(session->immpool.queue,
+ (void*)&mtask, sizeof(void*));
+ spin_unlock(&session->lock);
+ }
+ }
+ break;
+ case ISCSI_OP_SCSI_TMFUNC_RSP:
+ if (conn->in.datalen || conn->in.ahslen) {
+ rc = ISCSI_ERR_PROTO;
+ break;
+ }
+ spin_lock(&session->lock);
+ __kfifo_put(session->immpool.queue, (void*)&mtask,
+ sizeof(void*));
+ spin_unlock(&session->lock);
+ del_timer_sync(&conn->tmabort_timer);
+ conn->tmabort_state = ((struct iscsi_tm_rsp *)hdr)->
+ response == SCSI_TCP_TM_RESP_COMPLETE ?
+ TMABORT_SUCCESS : TMABORT_FAILED;
+ wake_up(&conn->ehwait);
+ break;
+ default:
+ rc = ISCSI_ERR_BAD_OPCODE;
+ break;
+ }
+ } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
+ if (conn->in.opcode == ISCSI_OP_NOOP_IN &&
+ !conn->in.datalen) {
+ rc = iscsi_control_recv_pdu(
+ conn->handle, hdr, NULL, 0);
+ } else {
+ rc = ISCSI_ERR_BAD_OPCODE;
+ }
+ } else {
+ rc = ISCSI_ERR_BAD_ITT;
+ }
+
+ return rc;
+}
+
+/*
+ * iscsi_ctask_copy - copy skb bits to the destanation cmd task
+ *
+ * The function calls skb_copy_bits() and updates per-connection and
+ * per-cmd byte counters.
+ */
+static inline int
+iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ void *buf, int buf_size)
+{
+ int buf_left = buf_size - conn->data_copied;
+ int size = min(conn->in.copy, buf_left);
+ int rc;
+
+ /*
+ * Read counters (in bytes):
+ *
+ * conn->in.offset offset within in progress SKB
+ * conn->in.copy left to copy from in progress SKB
+ * including padding
+ * conn->in.copied copied already from in progress SKB
+ * conn->data_copied copied already from in progress buffer
+ * ctask->sent total bytes sent up to the MidLayer
+ * ctask->data_count left to copy from in progress Data-In
+ * buf_left left to copy from in progress buffer
+ */
+
+ size = min(size, ctask->data_count);
+
+ debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
+ size, conn->in.offset, conn->in.copied);
+
+ BUG_ON(size <= 0);
+ BUG_ON(ctask->sent + size > ctask->total_length);
+
+ rc = skb_copy_bits(conn->in.skb, conn->in.offset,
+ (char*)buf + conn->data_copied, size);
+ /* must fit into skb->len */
+ BUG_ON(rc);
+
+ conn->in.offset += size;
+ conn->in.copy -= size;
+ conn->in.copied += size;
+ conn->data_copied += size;
+ ctask->sent += size;
+ ctask->data_count -= size;
+
+ BUG_ON(conn->in.copy < 0);
+ BUG_ON(ctask->data_count < 0);
+
+ if (buf_size != conn->data_copied) {
+ if (!ctask->data_count) {
+ BUG_ON(buf_size - conn->data_copied < 0);
+ /* done with this PDU */
+ return buf_size - conn->data_copied;
+ }
+ return -EAGAIN;
+ }
+
+ /* done with this buffer or with both - PDU and buffer */
+ conn->data_copied = 0;
+ return 0;
+}
+
+/*
+ * iscsi_tcp_copy - copy skb bits to the destanation buffer
+ *
+ * The function calls skb_copy_bits() and updates per-connection byte counters.
+ */
+static inline int
+iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
+{
+ int buf_left = buf_size - conn->data_copied;
+ int size = min(conn->in.copy, buf_left);
+ int rc;
+
+ debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
+ size, conn->in.offset, conn->data_copied);
+ BUG_ON(size <= 0);
+
+ rc = skb_copy_bits(conn->in.skb, conn->in.offset,
+ (char*)buf + conn->data_copied, size);
+ BUG_ON(rc);
+
+ conn->in.offset += size;
+ conn->in.copy -= size;
+ conn->in.copied += size;
+ conn->data_copied += size;
+
+ if (buf_size != conn->data_copied)
+ return -EAGAIN;
+
+ return 0;
+}
+
+static int
+iscsi_data_recv(struct iscsi_conn *conn)
+{
+ struct iscsi_session *session = conn->session;
+ int rc = 0;
+
+ switch(conn->in.opcode) {
+ case ISCSI_OP_SCSI_DATA_IN: {
+ struct iscsi_cmd_task *ctask = conn->in.ctask;
+ struct scsi_cmnd *sc = ctask->sc;
+ BUG_ON(!(ctask->in_progress & IN_PROGRESS_READ &&
+ conn->in_progress == IN_PROGRESS_DATA_RECV));
+ BUG_ON(ctask != (void*)sc->SCp.ptr);
+
+ /*
+ * copying Data-In into the Scsi_Cmnd
+ */
+ if (sc->use_sg) {
+ int i;
+ struct scatterlist *sg = sc->request_buffer;
+
+ for (i = ctask->sg_count; i < sc->use_sg; i++) {
+ char *dest;
+
+ dest = kmap_atomic(sg[i].page, KM_USER0);
+ rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
+ sg->length);
+ kunmap_atomic(dest, KM_USER0);
+ if (rc == -EAGAIN) {
+ /* continue with the next SKB/PDU */
+ goto exit;
+ }
+ if (!rc) {
+ ctask->sg_count++;
+ }
+ if (!ctask->data_count) {
+ rc = 0;
+ break;
+ }
+ if (!conn->in.copy) {
+ rc = -EAGAIN;
+ goto exit;
+ }
+ }
+ } else {
+ rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
+ sc->request_bufflen);
+ if (rc == -EAGAIN)
+ goto exit;
+ rc = 0;
+ }
+
+ /* check for non-exceptional status */
+ if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
+ debug_scsi("done [sc %lx res %d itt 0x%x]\n",
+ (long)sc, sc->result, ctask->itt);
+ iscsi_ctask_cleanup(conn, ctask);
+ sc->result = conn->in.cmd_status;
+ sc->scsi_done(sc);
+ }
+ }
+ break;
+ case ISCSI_OP_SCSI_CMD_RSP: {
+ /*
+ * SCSI Sense Data:
+ * copying the entire Data Segment.
+ */
+ if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
+ rc = -EAGAIN;
+ goto exit;
+ }
+
+ /*
+ * check for sense
+ */
+ conn->in.hdr = &conn->hdr;
+ conn->senselen = (conn->data[0] << 8) | conn->data[1];
+ rc = iscsi_cmd_rsp(conn, conn->in.ctask);
+ }
+ break;
+ case ISCSI_OP_TEXT_RSP:
+ case ISCSI_OP_LOGIN_RSP:
+ case ISCSI_OP_NOOP_IN: {
+ struct iscsi_mgmt_task *mtask = NULL;
+
+ if (conn->in.itt != ISCSI_RESERVED_TAG) {
+ mtask = (struct iscsi_mgmt_task *)
+ session->imm_cmds[conn->in.itt -
+ ISCSI_IMM_ITT_OFFSET];
+ }
+
+ /*
+ * Collect data segment to the connection's data
+ * placeholder
+ */
+ if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
+ rc = -EAGAIN;
+ goto exit;
+ }
+
+ rc = iscsi_control_recv_pdu(conn->handle,
+ conn->in.hdr, conn->data, conn->in.datalen);
+
+ if (mtask && conn->login_mtask != mtask) {
+ spin_lock(&session->lock);
+ __kfifo_put(session->immpool.queue, (void*)&mtask,
+ sizeof(void*));
+ spin_unlock(&session->lock);
+ }
+ }
+ break;
+ default:
+ BUG_ON(1);
+ }
+exit:
+ return rc;
+}
+
+/*
+ * TCP receive
+ */
+static int
+iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
+{
+ int rc;
+ struct iscsi_conn *conn = iscsi_conn_get(rd_desc);
+ int start = skb_headlen(skb);
+
+ /*
+ * Save current SKB and its offset in the corresponding
+ * connection context.
+ */
+ conn->in.copy = start - offset;
+ conn->in.offset = offset;
+ conn->in.skb = skb;
+ conn->in.len = conn->in.copy;
+ BUG_ON(conn->in.copy <= 0);
+ debug_tcp("in %d bytes\n", conn->in.copy);
+
+more:
+ conn->in.copied = 0;
+ rc = 0;
+
+ if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
+ conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
+ rc = iscsi_hdr_extract(conn);
+ if (rc == -EAGAIN)
+ goto nomore;
+
+ /*
+ * Verify and process incoming PDU header.
+ */
+ rc = iscsi_hdr_recv(conn);
+ if (!rc && conn->in.datalen) {
+ conn->in_progress = IN_PROGRESS_DATA_RECV;
+ } else if (rc) {
+ printk("iSCSI: bad hdr rc (%d)\n", rc);
+ iscsi_control_cnx_error(conn->handle, rc);
+ return 0;
+ }
+ }
+
+ if (conn->in_progress == IN_PROGRESS_DATA_RECV &&
+ conn->in.copy) {
+
+ debug_tcp("data_recv offset %d copy %d\n",
+ conn->in.offset, conn->in.copy);
+
+ rc = iscsi_data_recv(conn);
+ if (rc) {
+ if (rc == -EAGAIN) {
+ rd_desc->count = conn->in.datalen -
+ conn->in.ctask->sent;
+ goto again;
+ }
+ printk("iSCSI: bad data rc (%d)\n", rc);
+ iscsi_control_cnx_error(conn->handle, rc);
+ return 0;
+ }
+ conn->in.copy -= conn->in.padding;
+ conn->in.offset += conn->in.padding;
+ conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ }
+
+ debug_tcp("f, processed %d from out of %d padding %d\n",
+ conn->in.offset - offset, len, conn->in.padding);
+ BUG_ON(conn->in.offset - offset > len);
+
+ if (conn->in.offset - offset != len) {
+ debug_tcp("continue to process %d bytes\n",
+ len - (conn->in.offset - offset));
+ goto more;
+ }
+
+nomore:
+ BUG_ON(conn->in.offset - offset == 0);
+ return conn->in.offset - offset;
+
+again:
+ debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
+ conn->in.offset - offset, len, rd_desc->count);
+ BUG_ON(conn->in.offset - offset == 0);
+ BUG_ON(conn->in.offset - offset > len);
+
+ return conn->in.offset - offset;
+}
+
+static void
+iscsi_tcp_data_ready(struct sock *sk, int flag)
+{
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
+ read_descriptor_t rd_desc;
+
+ read_lock(&sk->sk_callback_lock);
+
+ /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
+ iscsi_conn_set(&rd_desc, conn);
+ rd_desc.count = 0;
+ tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
+
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void
+iscsi_tcp_state_change(struct sock *sk)
+{
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
+ struct iscsi_session *session = conn->session;
+
+ if (sk->sk_state == TCP_CLOSE_WAIT ||
+ sk->sk_state == TCP_CLOSE) {
+ debug_tcp("iscsi_tcp_state_change: TCP_CLOSE\n");
+ conn->c_stage = ISCSI_CNX_CLEANUP_WAIT;
+ spin_lock_bh(&session->conn_lock);
+ if (session->conn_cnt == 1 ||
+ session->leadconn == conn) {
+ session->state = ISCSI_STATE_FAILED;
+ }
+ spin_unlock_bh(&session->conn_lock);
+ iscsi_control_cnx_error(conn->handle, ISCSI_ERR_CNX_FAILED);
+ }
+ conn->old_state_change(sk);
+}
+
+/*
+ * Called when more output buffer space is available for this socket.
+ */
+static void
+iscsi_write_space(struct sock *sk)
+{
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
+ conn->old_write_space(sk);
+ debug_tcp("iscsi_write_space: cid %d\n", conn->id);
+ conn->suspend = 0; wmb();
+ schedule_work(&conn->xmitwork);
+}
+
+static void
+iscsi_conn_set_callbacks(struct iscsi_conn *conn)
+{
+ struct sock *sk = conn->sock->sk;
+
+ /* assign new callbacks */
+ write_lock_bh(&sk->sk_callback_lock);
+ sk->sk_user_data = conn;
+ conn->old_data_ready = sk->sk_data_ready;
+ conn->old_state_change = sk->sk_state_change;
+ conn->old_write_space = sk->sk_write_space;
+ sk->sk_data_ready = iscsi_tcp_data_ready;
+ sk->sk_state_change = iscsi_tcp_state_change;
+ sk->sk_write_space = iscsi_write_space;
+ write_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void
+iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
+{
+ struct sock *sk = conn->sock->sk;
+
+ /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
+ write_lock_bh(&sk->sk_callback_lock);
+ sk->sk_user_data = NULL;
+ sk->sk_data_ready = conn->old_data_ready;
+ sk->sk_state_change = conn->old_state_change;
+ sk->sk_write_space = conn->old_write_space;
+ sk->sk_no_check = 0;
+ write_unlock_bh(&sk->sk_callback_lock);
+}
+
+/*
+ * iscsi_sendhdr - send PDU Header via tcp_sendpage()
+ * (Tx, Fast Path)
+ */
+static inline int
+iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf)
+{
+ struct socket *sk = conn->sock;
+ int flags = 0; /* MSG_DONTWAIT; */
+ int res, offset, size;
+
+ offset = buf->sg.offset + buf->sent;
+ size = buf->sg.length - buf->sent;
+ BUG_ON(buf->sent + size > buf->sg.length);
+ if (buf->sent + size != buf->sg.length) {
+ flags |= MSG_MORE;
+ }
+
+ /* sendpage */
+ res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
+ debug_tcp("sendhdr %lx %d bytes at offset %d sent %d res %d\n",
+ (long)page_address(buf->sg.page), size, offset, buf->sent, res);
+ if (res >= 0) {
+ buf->sent += res;
+ if (size != res)
+ return -EAGAIN;
+ return 0;
+ } else if (res == -EAGAIN) {
+ conn->suspend = 1;
+ } else if (res == -EPIPE) {
+ conn->suspend = 1;
+ iscsi_control_cnx_error(conn->handle, ISCSI_ERR_CNX_FAILED);
+ }
+
+ return res;
+}
+
+/*
+ * iscsi_sendpage - send one page of iSCSI Data-Out.
+ * (Tx, Fast Path)
+ */
+static inline int
+iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
+ int *count, int *sent)
+{
+ ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
+ struct socket *sk = conn->sock;
+ int flags = 0; /* MSG_DONTWAIT; */
+ int res, offset, size;
+
+ size = buf->sg.length - buf->sent;
+ BUG_ON(buf->sent + size > buf->sg.length);
+ if (size > *count) {
+ size = *count;
+ }
+ if (buf->sent + size != buf->sg.length) {
+ flags |= MSG_MORE;
+ }
+
+ offset = buf->sg.offset + buf->sent;
+
+ /* tcp_sendpage */
+ sendpage = sk->ops->sendpage ? : sock_no_sendpage;
+
+ res = sendpage(sk, buf->sg.page, offset, size, flags);
+ debug_tcp("sendpage %lx %d bytes, boff %d bsent %d "
+ "left %d sent %d res %d\n",
+ (long)page_address(buf->sg.page), size, offset,
+ buf->sent, *count, *sent, res);
+ if (res >= 0) {
+ buf->sent += res;
+ *count -= res;
+ *sent += res;
+ if (size != res)
+ return -EAGAIN;
+ return 0;
+ } else if (res == -EAGAIN) {
+ conn->suspend = 1;
+ } else if (res == -EPIPE) {
+ conn->suspend = 1;
+ iscsi_control_cnx_error(conn->handle, ISCSI_ERR_CNX_FAILED);
+ }
+
+ return res;
+}
+
+/*
+ * iscsi_solicit_data_cont - initialize next Data-Out
+ *
+ * Initialize next Data-Out within this R2T sequence and continue
+ * to process next Scatter-Gather element(if any) of this SCSI command.
+ *
+ * Called under connection lock.
+ */
+static void
+iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ struct iscsi_r2t_info *r2t, int left)
+{
+ struct iscsi_data *hdr;
+ struct iscsi_data_task *dtask;
+ struct scsi_cmnd *sc = ctask->sc;
+ int new_offset;
+
+ dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
+ hdr = &dtask->hdr;
+ hdr->flags = 0;
+ hdr->rsvd2[0] = hdr->rsvd2[1] = hdr->rsvd3 =
+ hdr->rsvd4 = hdr->rsvd5 = hdr->rsvd6 = 0;
+ hdr->ttt = r2t->ttt;
+ hdr->datasn = htonl(r2t->solicit_datasn);
+ r2t->solicit_datasn++;
+ hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
+ memset(hdr->lun, 0, 8);
+ hdr->lun[1] = ctask->hdr.lun[1];
+ hdr->itt = ctask->hdr.itt;
+ hdr->exp_statsn = r2t->exp_statsn;
+ new_offset = r2t->data_offset + r2t->sent;
+ hdr->offset = htonl(new_offset);
+ if (left > conn->max_xmit_dlength) {
+ hton24(hdr->dlength, conn->max_xmit_dlength);
+ r2t->data_count = conn->max_xmit_dlength;
+ } else {
+ hton24(hdr->dlength, left);
+ r2t->data_count = left;
+ hdr->flags = ISCSI_FLAG_CMD_FINAL;
+ }
+
+ iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
+ (u8 *)dtask->hdrext);
+
+ if (sc->use_sg) {
+ BUG_ON(ctask->bad_sg == r2t->sg);
+ if (!iscsi_buf_left(&r2t->sendbuf)) {
+ iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
+ r2t->sg += 1;
+ }
+ } else {
+ iscsi_buf_init_virt(&ctask->sendbuf,
+ (char*)sc->request_buffer + new_offset,
+ r2t->data_count);
+ }
+
+ list_add(&dtask->item, &ctask->dataqueue);
+}
+
+static void
+iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_data *hdr;
+ struct iscsi_data_task *dtask;
+
+ dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
+ hdr = &dtask->hdr;
+ hdr->rsvd2[0] = hdr->rsvd2[1] = hdr->rsvd3 =
+ hdr->rsvd4 = hdr->rsvd5 = hdr->rsvd6 = 0;
+ hdr->ttt = ISCSI_RESERVED_TAG;
+ hdr->datasn = htonl(ctask->unsol_datasn);
+ ctask->unsol_datasn++;
+ hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
+ memset(hdr->lun, 0, 8);
+ hdr->lun[1] = ctask->hdr.lun[1];
+ hdr->itt = ctask->hdr.itt;
+ hdr->exp_statsn = htonl(conn->exp_statsn);
+ hdr->offset = htonl(ctask->total_length - ctask->r2t_data_count -
+ ctask->unsol_count);
+ if (ctask->unsol_count > conn->max_xmit_dlength) {
+ hton24(hdr->dlength, conn->max_xmit_dlength);
+ ctask->data_count = conn->max_xmit_dlength;
+ hdr->flags = 0;
+ } else {
+ hton24(hdr->dlength, ctask->unsol_count);
+ ctask->data_count = ctask->unsol_count;
+ hdr->flags = ISCSI_FLAG_CMD_FINAL;
+ }
+
+ iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)hdr,
+ (u8 *)dtask->hdrext);
+
+ list_add(&dtask->item, &ctask->dataqueue);
+}
+
+/*
+ * Initialize iSCSI SCSI_READ or SCSI_WRITE commands
+ */
+static void
+iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ struct scsi_cmnd *sc)
+{
+ struct iscsi_session *session = conn->session;
+
+ ctask->sc = sc;
+ ctask->conn = conn;
+ ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
+ ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
+ ctask->hdr.lun[1] = sc->device->lun;
+ ctask->hdr.itt = htonl(ctask->itt);
+ ctask->hdr.data_length = htonl(sc->request_bufflen);
+ ctask->hdr.cmdsn = htonl(session->cmdsn); session->cmdsn++;
+ ctask->hdr.exp_statsn = htonl(conn->exp_statsn);
+ memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
+ memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
+
+ ctask->in_progress = IN_PROGRESS_IDLE;
+ ctask->sent = 0;
+ ctask->sg_count = 0;
+
+ ctask->total_length = sc->request_bufflen;
+
+ if (sc->sc_data_direction == DMA_TO_DEVICE) {
+ ctask->exp_r2tsn = 0;
+ ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
+ ctask->in_progress = IN_PROGRESS_WRITE;
+ BUG_ON(ctask->total_length == 0);
+ if (sc->use_sg) {
+ struct scatterlist *sg = sc->request_buffer;
+
+ iscsi_buf_init_sg(&ctask->sendbuf, &sg[0]);
+ ctask->sg = sg + 1;
+ ctask->bad_sg = sg + sc->use_sg;
+ } else {
+ iscsi_buf_init_virt(&ctask->sendbuf, sc->request_buffer,
+ sc->request_bufflen);
+ BUG_ON(sc->request_bufflen > PAGE_SIZE);
+ }
+
+ /*
+ * Write counters:
+ *
+ * imm_count bytes to be sent right after
+ * SCSI PDU Header
+ *
+ * unsol_count bytes(as Data-Out) to be sent
+ * without R2T ack right after
+ * immediate data
+ *
+ * r2t_data_count bytes to be sent via R2T ack's
+ */
+ ctask->imm_count = 0;
+ ctask->unsol_count = 0;
+ ctask->unsol_datasn = 0;
+ ctask->xmstate = XMSTATE_W_HDR;
+ if (session->imm_data_en) {
+ if (ctask->total_length >= session->first_burst) {
+ ctask->imm_count = min(session->first_burst,
+ conn->max_xmit_dlength);
+ } else {
+ ctask->imm_count = min(ctask->total_length,
+ conn->max_xmit_dlength);
+ }
+ hton24(ctask->hdr.dlength, ctask->imm_count);
+ ctask->xmstate |= XMSTATE_IMM_DATA;
+ } else {
+ zero_data(ctask->hdr.dlength);
+ }
+ if (!session->initial_r2t_en) {
+ ctask->unsol_count=min(session->first_burst,
+ ctask->total_length) - ctask->imm_count;
+ }
+ if (!ctask->unsol_count) {
+ /* No unsolicit Data-Out's */
+ ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
+ } else {
+ ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
+ }
+ ctask->r2t_data_count = ctask->total_length -
+ ctask->imm_count -
+ ctask->unsol_count;
+
+ debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
+ "r2t_data %d]\n",
+ ctask->itt, ctask->total_length, ctask->imm_count,
+ ctask->unsol_count, ctask->r2t_data_count);
+ } else {
+ ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
+ if (sc->sc_data_direction == DMA_FROM_DEVICE)
+ ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
+ ctask->datasn = 0;
+ ctask->in_progress = IN_PROGRESS_READ;
+ ctask->xmstate = XMSTATE_R_HDR;
+ zero_data(ctask->hdr.dlength);
+ }
+
+ iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)&ctask->hdr,
+ (u8 *)ctask->hdrext);
+}
+
+/*
+ * iscsi_mtask_xmit - xmit management(immediate) task
+ *
+ * The function can return -EAGAIN in which case caller must
+ * call it again later, or recover. '0' return code means successful
+ * xmit.
+ *
+ * Management xmit state machine consists of two states:
+ * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
+ * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
+ */
+static int
+iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
+{
+
+ debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
+ conn->id, mtask->xmstate, mtask->itt);
+
+ if (mtask->xmstate & XMSTATE_IMM_HDR) {
+ mtask->xmstate &= ~XMSTATE_IMM_HDR;
+ if (mtask->data_count)
+ mtask->xmstate |= XMSTATE_IMM_DATA;
+ if (iscsi_sendhdr(conn, &mtask->headbuf)) {
+ mtask->xmstate |= XMSTATE_IMM_HDR;
+ if (mtask->data_count)
+ mtask->xmstate &= ~XMSTATE_IMM_DATA;
+ return -EAGAIN;
+ }
+ }
+
+ if (mtask->xmstate & XMSTATE_IMM_DATA) {
+ BUG_ON(!mtask->data_count);
+ mtask->xmstate &= ~XMSTATE_IMM_DATA;
+ /* FIXME: implement.
+ * Virtual buffer could be spreaded accross multiple pages...
+ */
+ do {
+ if (iscsi_sendpage(conn, &mtask->sendbuf,
+ &mtask->data_count, &mtask->sent)) {
+ mtask->xmstate |= XMSTATE_IMM_DATA;
+ return -EAGAIN;
+ }
+ } while (mtask->data_count);
+ }
+
+ BUG_ON(mtask->xmstate != XMSTATE_IDLE);
+ return 0;
+}
+
+static int
+iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_r2t_info *r2t = NULL;
+
+ debug_scsi("ctask deq [cid %d state %x itt 0x%x]\n",
+ conn->id, ctask->xmstate, ctask->itt);
+
+ if (ctask->xmstate & XMSTATE_R_HDR) {
+ ctask->xmstate &= ~XMSTATE_R_HDR;
+ if (!iscsi_sendhdr(conn, &ctask->headbuf)) {
+ BUG_ON(ctask->xmstate != XMSTATE_IDLE);
+ return 0; /* wait for Data-In */
+ }
+ ctask->xmstate |= XMSTATE_R_HDR;
+ return -EAGAIN;
+ }
+
+ if (ctask->xmstate & XMSTATE_W_HDR) {
+ ctask->xmstate &= ~XMSTATE_W_HDR;
+ if (iscsi_sendhdr(conn, &ctask->headbuf)) {
+ ctask->xmstate |= XMSTATE_W_HDR;
+ return -EAGAIN;
+ }
+ }
+
+ if (ctask->xmstate & XMSTATE_IMM_DATA) {
+ BUG_ON(!ctask->imm_count);
+ ctask->xmstate &= ~XMSTATE_IMM_DATA;
+ while (1) {
+ if (iscsi_sendpage(conn, &ctask->sendbuf,
+ &ctask->imm_count, &ctask->sent)) {
+ ctask->xmstate |= XMSTATE_IMM_DATA;
+ return -EAGAIN;
+ }
+ if (!ctask->imm_count)
+ break;
+ iscsi_buf_init_sg(&ctask->sendbuf,
+ &ctask->sg[ctask->sg_count++]);
+ }
+ }
+
+ if (ctask->xmstate & XMSTATE_UNS_HDR) {
+ BUG_ON(!ctask->unsol_count);
+ ctask->xmstate &= ~XMSTATE_UNS_HDR;
+_unsolicit_head_again:
+ ctask->xmstate |= XMSTATE_UNS_DATA;
+ if (ctask->xmstate & XMSTATE_UNS_INIT) {
+ iscsi_unsolicit_data_init(conn, ctask);
+ ctask->xmstate &= ~XMSTATE_UNS_INIT;
+ }
+ if (iscsi_sendhdr(conn, &ctask->headbuf)) {
+ ctask->xmstate &= ~XMSTATE_UNS_DATA;
+ ctask->xmstate |= XMSTATE_UNS_HDR;
+ return -EAGAIN;
+ }
+
+ debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
+ ctask->itt, ctask->unsol_count, ctask->sent);
+ }
+
+ if (ctask->xmstate & XMSTATE_UNS_DATA) {
+ BUG_ON(!ctask->data_count);
+ ctask->xmstate &= ~XMSTATE_UNS_DATA;
+ while (1) {
+ int start = ctask->sent;
+ if (iscsi_sendpage(conn, &ctask->sendbuf,
+ &ctask->data_count,
+ &ctask->sent)) {
+ ctask->unsol_count -= ctask->sent - start;
+ ctask->xmstate |= XMSTATE_UNS_DATA;
+ /* will continue with this ctask later.. */
+ return -EAGAIN;
+ }
+ BUG_ON(ctask->sent > ctask->total_length);
+ ctask->unsol_count -= ctask->sent - start;
+ if (!ctask->data_count)
+ break;
+ iscsi_buf_init_sg(&ctask->sendbuf,
+ &ctask->sg[ctask->sg_count++]);
+ }
+ BUG_ON(ctask->unsol_count < 0);
+
+ /*
+ * Done with the Data-Out. Next, check if we need
+ * to send another unsolicited Data-Out.
+ */
+ if (ctask->unsol_count) {
+ ctask->xmstate |= XMSTATE_UNS_INIT;
+ goto _unsolicit_head_again;
+ }
+
+ BUG_ON(ctask->xmstate != XMSTATE_IDLE);
+ return 0;
+ }
+
+ if (ctask->xmstate & XMSTATE_SOL_HDR) {
+ ctask->xmstate &= ~XMSTATE_SOL_HDR;
+ ctask->xmstate |= XMSTATE_SOL_DATA;
+ if (!ctask->r2t) {
+ __kfifo_get(ctask->r2tqueue, (void*)&r2t,
+ sizeof(void*));
+ ctask->r2t = r2t;
+ }
+_solicit_head_again:
+ BUG_ON(r2t == NULL);
+ if (iscsi_sendhdr(conn, &r2t->headbuf)) {
+ ctask->xmstate &= ~XMSTATE_SOL_DATA;
+ ctask->xmstate |= XMSTATE_SOL_HDR;
+ return -EAGAIN;
+ }
+
+ debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
+ r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
+ r2t->sent);
+ }
+
+ if (ctask->xmstate & XMSTATE_SOL_DATA) {
+ int left;
+
+ ctask->xmstate &= ~XMSTATE_SOL_DATA;
+ r2t = ctask->r2t;
+_solicit_again:
+ /*
+ * send Data-Out whitnin this R2T sequence.
+ */
+ if (r2t->data_count) {
+ if (iscsi_sendpage(conn, &r2t->sendbuf,
+ &r2t->data_count,
+ &r2t->sent)) {
+ ctask->xmstate |= XMSTATE_SOL_DATA;
+ /* will continue with this ctask later.. */
+ return -EAGAIN;
+ }
+ BUG_ON(r2t->data_count < 0);
+ if (r2t->data_count) {
+ BUG_ON(ctask->bad_sg == r2t->sg);
+ BUG_ON(ctask->sc->use_sg == 0);
+ if (!iscsi_buf_left(&r2t->sendbuf)) {
+ iscsi_buf_init_sg(&r2t->sendbuf,
+ r2t->sg);
+ r2t->sg += 1;
+ }
+ goto _solicit_again;
+ }
+ }
+
+ /*
+ * Done with this Data-Out. Next, check if we have
+ * to send another Data-Out for this R2T.
+ */
+ BUG_ON(r2t->data_length - r2t->sent < 0);
+ left = r2t->data_length - r2t->sent;
+ if (left) {
+ iscsi_solicit_data_cont(conn, ctask, r2t, left);
+ ctask->xmstate |= XMSTATE_SOL_DATA;
+ goto _solicit_head_again;
+ }
+
+ /*
+ * Done with this R2T. Check if there are more
+ * outstanding R2Ts ready to be processed.
+ */
+ BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
+ ctask->r2t_data_count -= r2t->data_length;
+ ctask->r2t = NULL;
+ __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
+ if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
+ ctask->r2t = r2t;
+ ctask->xmstate |= XMSTATE_SOL_DATA;
+ goto _solicit_head_again;
+ }
+ }
+
+ BUG_ON(ctask->xmstate != XMSTATE_IDLE);
+ return 0;
+}
+
+/*
+ * iscsi_data_xmit - xmit any command into the scheduled connection
+ *
+ * The function can return -EAGAIN in which case the caller must
+ * re-schedule it again later or recover. '0' return code means successful
+ * xmit.
+ *
+ * Common data xmit state machine consists of two states:
+ * IN_PROGRESS_XMIT_IMM - xmit of Immediate PDU in progress
+ * IN_PROGRESS_XMIT_SCSI - xmit of SCSI command PDU in progress
+ */
+static int
+iscsi_data_xmit(struct iscsi_conn *conn)
+{
+ /*
+ * Transmit in the following order:
+ *
+ * 1) in progress task
+ * 2) write responses, if any
+ * 3) new read/write requests
+ */
+
+ /* process non-immediate(command) queue */
+ while (conn->in_progress_xmit == IN_PROGRESS_XMIT_SCSI &&
+ (conn->ctask ||
+ __kfifo_get(conn->writequeue, (void*)&conn->ctask,
+ sizeof(void*)) ||
+ __kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
+ sizeof(void*)))) {
+
+ if (iscsi_ctask_xmit(conn, conn->ctask))
+ return -EAGAIN;
+
+ /* done with this in progress ctask */
+ conn->ctask = NULL;
+
+ /* check if we have something for immediate delivery */
+ if (__kfifo_len(conn->immqueue))
+ break;
+ }
+
+ /* process immediate queue */
+ while (conn->mtask || __kfifo_get(conn->immqueue, (void*)&conn->mtask,
+ sizeof(void*))) {
+ struct iscsi_session *session = conn->session;
+
+ conn->in_progress_xmit = IN_PROGRESS_XMIT_IMM;
+
+ if (iscsi_mtask_xmit(conn, conn->mtask))
+ return -EAGAIN;
+
+ if (conn->mtask->hdr.itt == ISCSI_RESERVED_TAG) {
+ spin_lock_bh(&session->lock);
+ __kfifo_put(session->immpool.queue, (void*)&conn->mtask,
+ sizeof(void*));
+ spin_unlock_bh(&session->lock);
+ }
+
+ /* done with the current mtask */
+ conn->mtask = NULL;
+
+ if (__kfifo_len(conn->xmitqueue) ||
+ __kfifo_len(conn->writequeue)) {
+ /* re-schedule xmitqueue. have to do that in case
+ * when immediate PDU interrupts xmitqueue loop */
+ schedule_work(&conn->xmitwork);
+ }
+ }
+
+ conn->in_progress_xmit = IN_PROGRESS_XMIT_SCSI;
+
+ return 0;
+}
+
+static void
+iscsi_xmitworker(void *data)
+{
+ struct iscsi_conn *conn = data;
+
+ /*
+ * serialize Xmit worker on a per-connection basis.
+ */
+ down(&conn->xmitsema);
+ if (conn->suspend)
+ goto out;
+ if (iscsi_data_xmit(conn)) {
+ if (conn->c_stage == ISCSI_CNX_CLEANUP_WAIT ||
+ conn->c_stage == ISCSI_CNX_STOPPED ||
+ conn->suspend)
+ goto out;
+ /* re-schedule in case of -EAGAIN (out of socket buffer) */
+ schedule_work(&conn->xmitwork);
+ }
+out:
+ up(&conn->xmitsema);
+}
+
+#define FAILURE_BAD_HOST 1
+#define FAILURE_SESSION_FAILED 2
+#define FAILURE_SESSION_FREED 3
+#define FAILURE_WINDOW_CLOSED 4
+#define FAILURE_SESSION_TERMINATE 5
+
+int
+iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
+{
+ struct Scsi_Host *host;
+ int reason = 0;
+ struct iscsi_session *session;
+ struct iscsi_conn *conn = NULL;
+ struct iscsi_cmd_task *ctask = NULL;
+
+ sc->scsi_done = done;
+ sc->result = 0;
+
+ host = sc->device->host;
+ session = (struct iscsi_session*)host->hostdata;
+ BUG_ON(host->host_no != session->id);
+
+ spin_lock(&session->lock);
+
+ if (session->state != ISCSI_STATE_LOGGED_IN) {
+ if (session->state == ISCSI_STATE_FAILED) {
+ reason = FAILURE_SESSION_FAILED;
+ goto fault;
+ } else if (session->state == ISCSI_STATE_TERMINATE) {
+ reason = FAILURE_SESSION_TERMINATE;
+ goto fault;
+ }
+ reason = FAILURE_SESSION_FREED;
+ goto fault;
+ }
+
+ /*
+ * Check for iSCSI window and take care of CmdSN wrap-around
+ */
+ if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
+ reason = FAILURE_WINDOW_CLOSED;
+ goto reject;
+ }
+
+ if (session->conn_cnt > 1) {
+ struct iscsi_conn *cnx;
+ int cpu = smp_processor_id();
+
+ spin_lock(&session->conn_lock);
+ list_for_each_entry(cnx, &session->connections, item) {
+ if (cnx->busy) {
+ conn = cnx;
+ conn->busy--;
+ break;
+ }
+ if (cnx->cpu == cpu && cpu_online(cpu) && !cnx->busy) {
+ conn = cnx;
+ conn->busy = 16;
+ break;
+ }
+ }
+ spin_unlock(&session->conn_lock);
+ if (conn == NULL)
+ conn = session->leadconn;
+ } else {
+ conn = session->leadconn;
+ }
+
+ __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
+ spin_unlock(&session->lock);
+
+ BUG_ON(!ctask);
+ BUG_ON(ctask->in_progress = IN_PROGRESS_IDLE);
+
+ sc->SCp.ptr = (char*)ctask;
+ iscsi_cmd_init(conn, ctask, sc);
+
+ __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
+ debug_scsi(
+ "queued [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
+ sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
+ conn->id, (long)sc, ctask->itt, sc->request_bufflen,
+ session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
+
+ schedule_work(&conn->xmitwork);
+
+ return 0;
+
+reject:
+ spin_unlock(&session->lock);
+ debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+fault:
+ spin_unlock(&session->lock);
+ printk("iSCSI: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
+ sc->sense_buffer[0] = 0x70;
+ sc->sense_buffer[2] = NOT_READY;
+ sc->sense_buffer[7] = 0x6;
+ sc->sense_buffer[12] = 0x08;
+ sc->sense_buffer[13] = 0x00;
+ sc->result = (DID_NO_CONNECT << 16);
+ switch (sc->cmnd[0]) {
+ case INQUIRY:
+ case REQUEST_SENSE:
+ sc->resid = sc->cmnd[4];
+ case REPORT_LUNS:
+ sc->resid = sc->cmnd[6] << 24;
+ sc->resid |= sc->cmnd[7] << 16;
+ sc->resid |= sc->cmnd[8] << 8;
+ sc->resid |= sc->cmnd[9];
+ default:
+ sc->resid = sc->request_bufflen;
+ }
+ sc->scsi_done(sc);
+ return 0;
+}
+
+static int
+iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
+{
+ int i;
+
+ *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
+ if (*items == NULL)
+ return -ENOMEM;
+
+ q->max = max;
+ q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
+ if (q->pool == NULL) {
+ kfree(*items);
+ return -ENOMEM;
+ }
+
+ q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
+ GFP_KERNEL, NULL);
+ if (q->queue == ERR_PTR(-ENOMEM)) {
+ kfree(q->pool);
+ kfree(*items);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < max; i++) {
+ q->pool[i] = kmalloc(item_size, GFP_KERNEL);
+ if (q->pool[i] == NULL) {
+ int j;
+ for (j = 0; j < i; j++) {
+ kfree(q->pool[j]);
+ }
+ kfifo_free(q->queue);
+ kfree(q->pool);
+ kfree(*items);
+ return -ENOMEM;
+ }
+ memset(q->pool[i], 0, item_size);
+ (*items)[i] = q->pool[i];
+ __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
+ }
+ return 0;
+}
+
+static void
+iscsi_pool_free(struct iscsi_queue *q, void **items)
+{
+ int i;
+
+ for (i = 0; i < q->max; i++)
+ kfree(items[i]);
+ kfree(q->pool);
+ kfree(items);
+}
+
+/*
+ * Allocate a new connection within the session and bind it to
+ * the given socket.
+ */
+static iscsi_cnx_h
+iscsi_conn_create(iscsi_snx_h snxh, iscsi_cnx_h handle,
+ uint32_t conn_idx)
+{
+ struct iscsi_session *session = iscsi_ptr(snxh);
+ struct iscsi_conn *conn = NULL;
+
+ conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
+ if (conn == NULL)
+ goto conn_alloc_fault;
+ memset(conn, 0, sizeof(struct iscsi_conn));
+
+ conn->c_stage = ISCSI_CNX_INITIAL_STAGE;
+ conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ conn->in_progress_xmit = IN_PROGRESS_XMIT_SCSI;
+ conn->id = conn_idx;
+ conn->exp_statsn = 0;
+ conn->handle = handle;
+ conn->tmabort_state = TMABORT_INITIAL;
+
+ /* initial operational parameters */
+ conn->hdr_size = sizeof(struct iscsi_hdr);
+ conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
+
+ spin_lock_init(&conn->lock);
+
+ /* initialize general xmit PDU commands queue */
+ conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
+ GFP_KERNEL, NULL);
+ if (conn->xmitqueue == ERR_PTR(-ENOMEM))
+ goto xmitqueue_alloc_fault;
+
+ /* initialize write response PDU commands queue */
+ conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
+ GFP_KERNEL, NULL);
+ if (conn->writequeue == ERR_PTR(-ENOMEM))
+ goto writequeue_alloc_fault;
+
+ /* initialize general immediate PDU commands queue */
+ conn->immqueue = kfifo_alloc(session->imm_max * sizeof(void*),
+ GFP_KERNEL, NULL);
+ if (conn->immqueue == ERR_PTR(-ENOMEM))
+ goto immqueue_alloc_fault;
+ INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
+
+ /* allocate login_mtask used for initial login/text sequence */
+ spin_lock_bh(&session->lock);
+ if (!__kfifo_get(session->immpool.queue, (void*)&conn->login_mtask,
+ sizeof(void*))) {
+ spin_unlock_bh(&session->lock);
+ goto login_mtask_alloc_fault;
+ }
+ spin_unlock_bh(&session->lock);
+
+ /* allocate initial PDU receive place holder */
+ if (conn->max_recv_dlength <= PAGE_SIZE)
+ conn->data = kmalloc(conn->max_recv_dlength, GFP_KERNEL);
+ else
+ conn->data = (void*)__get_free_pages(GFP_KERNEL,
+ get_order(conn->max_recv_dlength));
+ if (!conn->data)
+ goto max_recv_dlenght_alloc_fault;
+
+ init_timer(&conn->tmabort_timer);
+ init_MUTEX(&conn->xmitsema);
+ init_waitqueue_head(&conn->ehwait);
+
+ return iscsi_handle(conn);
+
+max_recv_dlenght_alloc_fault:
+ spin_lock_bh(&session->lock);
+ __kfifo_put(session->immpool.queue, (void*)&conn->login_mtask,
+ sizeof(void*));
+ spin_unlock_bh(&session->lock);
+login_mtask_alloc_fault:
+ kfifo_free(conn->immqueue);
+immqueue_alloc_fault:
+ kfifo_free(conn->writequeue);
+writequeue_alloc_fault:
+ kfifo_free(conn->xmitqueue);
+xmitqueue_alloc_fault:
+ kfree(conn);
+conn_alloc_fault:
+ return iscsi_handle(NULL);
+}
+
+/*
+ * Terminate connection queues, free all associated resources.
+ */
+static void
+iscsi_conn_destroy(iscsi_cnx_h cnxh)
+{
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct iscsi_session *session = conn->session;
+
+ BUG_ON(conn->sock == NULL);
+
+ sock_hold(conn->sock->sk);
+ iscsi_conn_restore_callbacks(conn);
+ sock_put(conn->sock->sk);
+ sock_release(conn->sock);
+
+ del_timer_sync(&conn->tmabort_timer);
+ if (session->leadconn == conn) {
+ /*
+ * Control plane decided to destroy leading connection?
+ * Its a signal for us to give up on recovery.
+ */
+ session->state = ISCSI_STATE_TERMINATE;
+ wake_up(&conn->ehwait);
+ }
+
+ /*
+ * Block control plane caller (a thread coming from
+ * a user space) until all the in-progress commands for this connection
+ * time out or fail.
+ * We must serialize with xmitwork recv pathes.
+ */
+ down(&conn->xmitsema);
+ conn->c_stage = ISCSI_CNX_CLEANUP_WAIT;
+ while (1) {
+ spin_lock_bh(&conn->lock);
+ if (!session->host->host_busy) { /* OK for ERL == 0 */
+ spin_unlock_bh(&conn->lock);
+ break;
+ }
+ spin_unlock_bh(&conn->lock);
+ msleep_interruptible(500);
+ }
+ up(&conn->xmitsema);
+
+ /* now free crypto */
+ if (conn->hdrdgst_en || conn->datadgst_en) {
+ if (conn->tx_tfm)
+ crypto_free_tfm(conn->tx_tfm);
+ if (conn->rx_tfm)
+ crypto_free_tfm(conn->rx_tfm);
+ }
+
+ /* free conn->data, size = MaxRecvDataSegmentLength */
+ if (conn->max_recv_dlength <= PAGE_SIZE)
+ kfree(conn->data);
+ else
+ free_pages((unsigned long)conn->data,
+ get_order(conn->max_recv_dlength));
+
+ spin_lock_bh(&session->lock);
+ __kfifo_put(session->immpool.queue, (void*)&conn->login_mtask,
+ sizeof(void*));
+ spin_unlock_bh(&session->lock);
+
+ kfifo_free(conn->xmitqueue);
+ kfifo_free(conn->writequeue);
+ kfifo_free(conn->immqueue);
+
+ spin_lock_bh(&session->conn_lock);
+ list_del(&conn->item);
+ if (list_empty(&session->connections))
+ session->leadconn = NULL;
+ if (session->leadconn && session->leadconn == conn)
+ session->leadconn = container_of(session->connections.next,
+ struct iscsi_conn, item);
+ spin_unlock_bh(&session->conn_lock);
+
+ if (session->leadconn == NULL) {
+ /* non connections exits.. reset sequencing */
+ session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
+ }
+
+ kfree(conn);
+}
+
+static int
+iscsi_conn_bind(iscsi_snx_h snxh, iscsi_cnx_h cnxh, uint32_t transport_fd,
+ int is_leading)
+{
+ struct iscsi_session *session = iscsi_ptr(snxh);
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct sock *sk;
+ struct socket *sock;
+ int err;
+
+ if (!(sock = sockfd_lookup(transport_fd, &err))) {
+ printk("iSCSI: sockfd_lookup failed %d\n", err);
+ return -EEXIST;
+ }
+
+ /* bind iSCSI connection and socket */
+ conn->sock = sock;
+
+ /* setup Socket parameters */
+ sk = sock->sk;
+ sk->sk_reuse = 1;
+ sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
+ sk->sk_allocation = GFP_ATOMIC;
+
+ /* FIXME: disable Nagle's algorithm */
+
+ /* Intercept TCP callbacks for sendfile like receive processing. */
+ iscsi_conn_set_callbacks(conn);
+
+ /*
+ * bind new iSCSI connection to session
+ */
+ conn->session = session;
+
+ spin_lock_bh(&session->conn_lock);
+ list_add(&conn->item, &session->connections);
+ spin_unlock_bh(&session->conn_lock);
+
+ if (is_leading)
+ session->leadconn = conn;
+
+ return 0;
+}
+
+static int
+iscsi_conn_start(iscsi_cnx_h cnxh)
+{
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct iscsi_session *session = conn->session;
+
+ if (session == NULL) {
+ printk("iSCSI: can't start not-binded connection\n");
+ return -EPERM;
+ }
+
+ if (session->state == ISCSI_STATE_LOGGED_IN &&
+ session->leadconn == conn) {
+ scsi_scan_host(session->host);
+ }
+
+ spin_lock_bh(&session->lock);
+ conn->c_stage = ISCSI_CNX_STARTED;
+ conn->cpu = session->conn_cnt % num_online_cpus();
+ session->state = ISCSI_STATE_LOGGED_IN;
+ session->conn_cnt++;
+ spin_unlock_bh(&session->lock);
+
+ return 0;
+}
+
+static void
+iscsi_conn_stop(iscsi_cnx_h cnxh)
+{
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct iscsi_session *session = conn->session;
+
+ spin_lock_bh(&session->lock);
+ conn->c_stage = ISCSI_CNX_STOPPED;
+ conn->suspend = 1;
+ session->conn_cnt--;
+
+ if (session->conn_cnt == 0 ||
+ session->leadconn == conn) {
+ session->state = ISCSI_STATE_FAILED;
+ }
+ spin_unlock_bh(&session->lock);
+}
+
+static int
+iscsi_send_pdu(iscsi_cnx_h cnxh, struct iscsi_hdr *hdr, char *data,
+ uint32_t data_size)
+{
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct iscsi_session *session = conn->session;
+ struct iscsi_mgmt_task *mtask;
+ char *pdu_data = NULL;
+
+ /* FIXME: non-immediate control commands are not supported yet */
+ BUG_ON(!(hdr->opcode & ISCSI_OP_IMMEDIATE));
+
+ if (data_size) {
+ pdu_data = kmalloc(data_size, GFP_KERNEL);
+ if (!pdu_data)
+ return -ENOMEM;
+ }
+
+ spin_lock_bh(&session->lock);
+ if (conn->c_stage != ISCSI_CNX_INITIAL_STAGE) {
+ int exp_statsn;
+
+ if (!__kfifo_get(session->immpool.queue, (void*)&mtask,
+ sizeof(void*))) {
+ spin_unlock_bh(&session->lock);
+ return -ENOSPC;
+ }
+
+ /*
+ * Check previous ExpStatSN. Free associated resources.
+ */
+ exp_statsn = ((struct iscsi_nopout*)&mtask->hdr)->exp_statsn;
+ if ((int)(conn->exp_statsn - exp_statsn) <= 0) {
+ if (mtask->data) {
+ kfree(mtask->data);
+ mtask->data = NULL;
+ mtask->data_count = 0;
+ }
+ }
+ } else {
+ /*
+ * Preserve ITT for all requests within this
+ * login or text negotiation sequence. Note that mtask is
+ * preallocated at cnx_create() and will be released
+ * at cnx_start() or cnx_destroy().
+ */
+ mtask = conn->login_mtask;
+ }
+
+ /*
+ * pre-format CmdSN and ExpStatSN for outgoing PDU.
+ */
+ if (hdr->itt != ISCSI_RESERVED_TAG) {
+ hdr->itt = htonl(mtask->itt);
+ ((struct iscsi_nopout*)hdr)->cmdsn = htonl(session->cmdsn);
+ if (conn->c_stage == ISCSI_CNX_STARTED) {
+ session->cmdsn++;
+ }
+ } else {
+ /* do not advance CmdSN */
+ ((struct iscsi_nopout*)hdr)->cmdsn = htonl(session->cmdsn);
+ }
+ ((struct iscsi_nopout*)hdr)->exp_statsn = htonl(conn->exp_statsn);
+
+ memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
+
+ if (conn->c_stage != ISCSI_CNX_INITIAL_STAGE) {
+ iscsi_buf_init_hdr(conn, &mtask->headbuf, (char*)&mtask->hdr,
+ (u8 *)mtask->hdrext);
+ } else {
+ iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
+ sizeof(struct iscsi_hdr));
+ }
+ spin_unlock_bh(&session->lock);
+
+ if (mtask->data) {
+ kfree(mtask->data);
+ mtask->data = NULL;
+ mtask->data_count = 0;
+ }
+
+ if (data_size) {
+ memcpy(pdu_data, data, data_size);
+ mtask->data = pdu_data;
+ mtask->data_count = data_size;
+ }
+
+ mtask->xmstate = XMSTATE_IMM_HDR;
+
+ if (mtask->data_count) {
+ iscsi_buf_init_virt(&mtask->sendbuf, (char*)mtask->data,
+ mtask->data_count);
+ /* FIXME: implement: convertion of mtask->data into 1st
+ * mtask->sendbuf. Keep in mind that virtual buffer
+ * could be spreaded accross multiple pages... */
+ if(mtask->sendbuf.sg.offset + mtask->data_count > PAGE_SIZE) {
+ if (conn->c_stage == ISCSI_CNX_STARTED) {
+ spin_lock_bh(&session->lock);
+ __kfifo_put(session->immpool.queue,
+ (void*)&mtask, sizeof(void*));
+ spin_unlock_bh(&session->lock);
+ }
+ return -ENOMEM;
+ }
+ }
+
+ debug_scsi("immpdu [op 0x%x itt 0x%x datalen %d]\n",
+ hdr->opcode, ntohl(hdr->itt), data_size);
+
+ __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
+ schedule_work(&conn->xmitwork);
+
+ return 0;
+}
+
+static void
+iscsi_tmabort_timedout(unsigned long data)
+{
+ struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
+ struct iscsi_conn *conn = ctask->conn;
+
+ conn->tmabort_state = TMABORT_TIMEDOUT;
+ debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", (long)ctask->sc,
+ ctask->itt);
+}
+
+static int
+iscsi_eh_abort(struct scsi_cmnd *sc)
+{
+ int rc;
+ struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
+ struct iscsi_conn *conn = ctask->conn;
+ struct iscsi_session *session = conn->session;
+
+ spin_unlock_irq(session->host->host_lock);
+
+ debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+
+ /*
+ * two cases for ERL=0 here:
+ *
+ * 1) connection-level failure;
+ * 2) recovery due protocol error;
+ */
+ if (session->state != ISCSI_STATE_LOGGED_IN) {
+ if (session->state == ISCSI_STATE_TERMINATE)
+ goto failed;
+ } else {
+ struct iscsi_tm *hdr = &conn->tmhdr;
+
+ /*
+ * ctask timed out but session is OK
+ * ERL=0 requires task mgmt abort to be issued on each
+ * failed command. requests must be serialized.
+ */
+ memset(hdr, 0, sizeof(struct iscsi_tm));
+ hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
+ hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ memcpy(hdr->lun, ctask->hdr.lun, 8);
+ hdr->rtt = ctask->hdr.itt;
+ hdr->refcmdsn = ctask->hdr.cmdsn;
+
+ conn->tmabort_state = TMABORT_INITIAL;
+
+ rc = iscsi_send_pdu(iscsi_handle(conn),
+ (struct iscsi_hdr *)hdr, NULL, 0);
+ if (rc) {
+ session->state = ISCSI_STATE_FAILED;
+ iscsi_control_cnx_error(conn->handle,
+ ISCSI_ERR_CNX_FAILED);
+ debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
+ } else {
+ conn->tmabort_timer.expires = 3*HZ + jiffies; /*3 secs*/
+ conn->tmabort_timer.function = iscsi_tmabort_timedout;
+ conn->tmabort_timer.data = (unsigned long)ctask;
+ add_timer(&conn->tmabort_timer);
+ debug_scsi("abort sent [itt 0x%x]", ctask->itt);
+ }
+ }
+
+
+ /*
+ * block eh thread until:
+ *
+ * 1) abort response;
+ * 2) abort timeout;
+ * 3) session re-opened;
+ * 4) session terminated;
+ */
+ while (1) {
+ int p_state = session->state;
+ rc = wait_event_interruptible(conn->ehwait,
+ (p_state == ISCSI_STATE_LOGGED_IN ?
+ (session->state == ISCSI_STATE_TERMINATE ||
+ conn->tmabort_state != TMABORT_INITIAL) :
+ (session->state == ISCSI_STATE_TERMINATE ||
+ session->state == ISCSI_STATE_LOGGED_IN)));
+ if (rc) {
+ /* shutdown.. */
+ session->state = ISCSI_STATE_TERMINATE;
+ goto failed;
+ }
+
+ if (signal_pending(current))
+ flush_signals(current);
+
+ if (session->state == ISCSI_STATE_TERMINATE)
+ goto failed;
+
+ if (conn->tmabort_state == TMABORT_TIMEDOUT ||
+ conn->tmabort_state == TMABORT_FAILED) {
+ conn->tmabort_state = TMABORT_INITIAL;
+ session->state = ISCSI_STATE_FAILED;
+ iscsi_control_cnx_error(conn->handle,
+ ISCSI_ERR_CNX_FAILED);
+ continue;
+ }
+
+ break;
+ }
+
+ debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+ BUG_ON(session->state != ISCSI_STATE_LOGGED_IN);
+ spin_lock_irq(session->host->host_lock);
+ return SUCCESS;
+failed:
+ iscsi_ctask_cleanup(conn, ctask);
+ debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+ spin_lock_irq(session->host->host_lock);
+ return FAILED;
+}
+
+static int
+iscsi_r2tpool_alloc(struct iscsi_session *session)
+{
+ int i;
+ int cmd_i;
+
+ /*
+ * initialize per-task: R2T pool and xmit queue
+ */
+ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
+ struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
+
+ /* R2T pool */
+ if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t,
+ (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
+ goto r2t_alloc_fault;
+ }
+
+ /* R2T xmit queue */
+ ctask->r2tqueue = kfifo_alloc(session->max_r2t * sizeof(void*),
+ GFP_KERNEL, NULL);
+ if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
+ iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
+ goto r2t_alloc_fault;
+ }
+
+ /*
+ * number of
+ * Data-Out PDU's within R2T-sequence can be quite big;
+ * using mempool
+ */
+ ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
+ mempool_alloc_slab,
+ mempool_free_slab,
+ taskcache);
+ if (ctask->datapool == NULL) {
+ kfifo_free(ctask->r2tqueue);
+ iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
+ goto r2t_alloc_fault;
+ }
+ INIT_LIST_HEAD(&ctask->dataqueue);
+ }
+
+ return 0;
+
+r2t_alloc_fault:
+ for (i = 0; i < cmd_i; i++) {
+ mempool_destroy(session->cmds[i]->datapool);
+ kfifo_free(session->cmds[i]->r2tqueue);
+ iscsi_pool_free(&session->cmds[i]->r2tpool,
+ (void**)session->cmds[i]->r2ts);
+ }
+ return -ENOMEM;
+}
+
+static void
+iscsi_r2tpool_free(struct iscsi_session *session)
+{
+ int i;
+
+ for (i = 0; i < session->cmds_max; i++) {
+ mempool_destroy(session->cmds[i]->datapool);
+ kfifo_free(session->cmds[i]->r2tqueue);
+ iscsi_pool_free(&session->cmds[i]->r2tpool,
+ (void**)session->cmds[i]->r2ts);
+ }
+}
+
+static struct scsi_host_template iscsi_sht = {
+ .name = "iSCSI Initiator over TCP/IP, v."
+ ISCSI_DRV_VERSION,
+ .queuecommand = iscsi_queuecommand,
+ .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
+ .sg_tablesize = ISCSI_SG_TABLESIZE,
+ .cmd_per_lun = ISCSI_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .use_clustering = DISABLE_CLUSTERING,
+ .proc_name = "iscsi_tcp",
+ .this_id = -1,
+};
+
+static iscsi_snx_h
+iscsi_session_create(iscsi_snx_h handle, uint32_t initial_cmdsn,
+ uint32_t *host_no)
+{
+ int cmd_i;
+ struct iscsi_session *session;
+ struct Scsi_Host *host;
+ int res;
+
+ /* FIXME: verify "unique-ness" of the session's handle */
+
+ host = scsi_host_alloc(&iscsi_sht, sizeof(struct iscsi_session));
+ if (host == NULL) {
+ printk("can not allocate SCSI host for session %p\n",
+ iscsi_ptr(handle));
+ goto host_alloc_fault;
+ }
+ host->max_id = 1;
+ host->max_channel = 0;
+ session = (struct iscsi_session *)host->hostdata;
+
+ memset(session, 0, sizeof(struct iscsi_session));
+ *host_no = session->id = host->host_no;
+ session->host = host;
+ session->state = ISCSI_STATE_LOGGED_IN;
+ session->imm_max = ISCSI_IMM_CMDS_MAX;
+ session->cmds_max = ISCSI_XMIT_CMDS_MAX;
+ session->cmdsn = initial_cmdsn;
+ session->exp_cmdsn = initial_cmdsn + 1;
+ session->max_cmdsn = initial_cmdsn + 1;
+ session->handle = handle;
+ session->max_r2t = 1;
+
+ /* initialize SCSI PDU commands pool */
+ if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
+ (void***)&session->cmds, sizeof(struct iscsi_cmd_task))) {
+ goto cmdpool_alloc_fault;
+ }
+ /* pre-format cmds pool with ITT */
+ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
+ session->cmds[cmd_i]->itt = cmd_i;
+ }
+
+ spin_lock_init(&session->lock);
+ spin_lock_init(&session->conn_lock);
+ INIT_LIST_HEAD(&session->connections);
+
+ /* initialize immediate command pool */
+ if (iscsi_pool_init(&session->immpool, session->imm_max,
+ (void***)&session->imm_cmds, sizeof(struct iscsi_mgmt_task))) {
+ goto immpool_alloc_fault;
+ }
+ /* pre-format immediate cmds pool with ITT */
+ for (cmd_i = 0; cmd_i < session->imm_max; cmd_i++) {
+ session->imm_cmds[cmd_i]->itt = ISCSI_IMM_ITT_OFFSET + cmd_i;
+ }
+
+ if (iscsi_r2tpool_alloc(session))
+ goto r2tpool_alloc_fault;
+
+ res = scsi_add_host(host, NULL);
+ if (res) {
+ printk("can not add host_no %d (%d)\n", *host_no, res);
+ goto add_host_fault;
+ }
+
+ return iscsi_handle(session);
+
+add_host_fault:
+ iscsi_r2tpool_free(session);
+r2tpool_alloc_fault:
+ iscsi_pool_free(&session->immpool, (void**)session->imm_cmds);
+immpool_alloc_fault:
+ iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+cmdpool_alloc_fault:
+ scsi_host_put(host);
+host_alloc_fault:
+ *host_no = -1;
+ return iscsi_handle(NULL);
+}
+
+static void
+iscsi_session_destroy(iscsi_snx_h snxh)
+{
+ int cmd_i;
+ struct iscsi_data_task *dtask, *n;
+ struct iscsi_session *session = iscsi_ptr(snxh);
+
+ scsi_remove_host(session->host);
+
+ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
+ struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
+ list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
+ list_del(&dtask->item);
+ mempool_free(dtask, ctask->datapool);
+ }
+ }
+
+ for (cmd_i = 0; cmd_i < session->imm_max; cmd_i++) {
+ if (session->imm_cmds[cmd_i]->data)
+ kfree(session->imm_cmds[cmd_i]->data);
+ }
+
+ iscsi_r2tpool_free(session);
+ iscsi_pool_free(&session->immpool, (void**)session->imm_cmds);
+ iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ scsi_host_put(session->host);
+}
+
+static int
+iscsi_set_param(iscsi_cnx_h cnxh, iscsi_param_e param, uint32_t value)
+{
+ struct iscsi_conn *conn = iscsi_ptr(cnxh);
+ struct iscsi_session *session = conn->session;
+
+ if (conn->c_stage == ISCSI_CNX_INITIAL_STAGE) {
+ switch(param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH: {
+ char *saveptr = conn->data;
+
+ if (value <= PAGE_SIZE)
+ conn->data = kmalloc(value, GFP_KERNEL);
+ else
+ conn->data = (void*)__get_free_pages(GFP_KERNEL,
+ get_order(value));
+ if (conn->data == NULL) {
+ conn->data = saveptr;
+ return -ENOMEM;
+ }
+ if (conn->max_recv_dlength <= PAGE_SIZE)
+ kfree(saveptr);
+ else
+ free_pages((unsigned long)saveptr,
+ get_order(conn->max_recv_dlength));
+ conn->max_recv_dlength = value;
+ }
+ break;
+ case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+ conn->max_xmit_dlength = value;
+ break;
+ case ISCSI_PARAM_HDRDGST_EN:
+ conn->hdrdgst_en = value;
+ conn->hdr_size = sizeof(struct iscsi_hdr);
+ if (conn->hdrdgst_en) {
+ conn->hdr_size += sizeof(__u32);
+ if (!conn->tx_tfm)
+ conn->tx_tfm =
+ crypto_alloc_tfm("crc32c", 0);
+ if (!conn->tx_tfm)
+ return -ENOMEM;
+ if (!conn->rx_tfm)
+ conn->rx_tfm =
+ crypto_alloc_tfm("crc32c", 0);
+ if (!conn->rx_tfm) {
+ crypto_free_tfm(conn->tx_tfm);
+ return -ENOMEM;
+ }
+ } else {
+ if (conn->tx_tfm)
+ crypto_free_tfm(conn->tx_tfm);
+ if (conn->rx_tfm)
+ crypto_free_tfm(conn->rx_tfm);
+ }
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ if (conn->datadgst_en)
+ return -EPERM;
+ conn->datadgst_en = value;
+ break;
+ case ISCSI_PARAM_INITIAL_R2T_EN:
+ session->initial_r2t_en = value;
+ break;
+ case ISCSI_PARAM_MAX_R2T:
+ iscsi_r2tpool_free(session);
+ session->max_r2t = value;
+ if (session->max_r2t & (session->max_r2t - 1)) {
+ session->max_r2t =
+ roundup_pow_of_two(session->max_r2t);
+ }
+ if (iscsi_r2tpool_alloc(session))
+ return -ENOMEM;
+ break;
+ case ISCSI_PARAM_IMM_DATA_EN:
+ session->imm_data_en = value;
+ break;
+ case ISCSI_PARAM_FIRST_BURST:
+ session->first_burst = value;
+ break;
+ case ISCSI_PARAM_MAX_BURST:
+ session->max_burst = value;
+ break;
+ case ISCSI_PARAM_PDU_INORDER_EN:
+ session->pdu_inorder_en = value;
+ break;
+ case ISCSI_PARAM_DATASEQ_INORDER_EN:
+ session->dataseq_inorder_en = value;
+ break;
+ case ISCSI_PARAM_ERL:
+ session->erl = value;
+ break;
+ case ISCSI_PARAM_IFMARKER_EN:
+ session->ifmarker_en = value;
+ break;
+ case ISCSI_PARAM_OFMARKER_EN:
+ session->ifmarker_en = value;
+ break;
+ default:
+ break;
+ }
+ } else {
+ printk("iSCSI: can not change parameter [%d]\n", param);
+ }
+
+ return 0;
+}
+
+struct iscsi_transport iscsi_tcp_transport = {
+ .name = "tcp",
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
+ .create_session = iscsi_session_create,
+ .destroy_session = iscsi_session_destroy,
+ .create_cnx = iscsi_conn_create,
+ .bind_cnx = iscsi_conn_bind,
+ .destroy_cnx = iscsi_conn_destroy,
+ .set_param = iscsi_set_param,
+ .start_cnx = iscsi_conn_start,
+ .stop_cnx = iscsi_conn_stop,
+ .send_pdu = iscsi_send_pdu,
+};
+
+static int __init
+iscsi_tcp_init(void)
+{
+ int error;
+
+ taskcache = kmem_cache_create("iscsi_taskcache",
+ sizeof(struct iscsi_data_task), 0, 0, NULL, NULL);
+ if (!taskcache)
+ return -ENOMEM;
+
+ error = iscsi_register_transport(&iscsi_tcp_transport, 0);
+ if (error)
+ kmem_cache_destroy(taskcache);
+
+ return error;
+}
+
+static void __exit
+iscsi_tcp_exit(void)
+{
+ iscsi_unregister_transport(0);
+ kmem_cache_destroy(taskcache);
+}
+
+module_init(iscsi_tcp_init);
+module_exit(iscsi_tcp_exit);
diff -Nru --exclude Kconfig --exclude Makefile linux-2.6.11.orig/drivers/scsi/iscsi_tcp.h linux-2.6.11.dima/drivers/scsi/iscsi_tcp.h
--- linux-2.6.11.orig/drivers/scsi/iscsi_tcp.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.11.dima/drivers/scsi/iscsi_tcp.h 2005-03-04 17:50:11.134414145 -0800
@@ -0,0 +1,283 @@
+/*
+ * iSCSI Initiator TCP Transport
+ * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@@googlegroups.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#ifndef ISCSI_TCP_H
+#define ISCSI_TCP_H
+
+#include <scsi/iscsi_if.h>
+
+/* Session's states */
+#define ISCSI_STATE_FREE 1
+#define ISCSI_STATE_LOGGED_IN 2
+#define ISCSI_STATE_FAILED 3
+#define ISCSI_STATE_TERMINATE 4
+
+/* Connection's states */
+#define ISCSI_CNX_INITIAL_STAGE 0
+#define ISCSI_CNX_STARTED 1
+#define ISCSI_CNX_STOPPED 2
+#define ISCSI_CNX_CLEANUP_WAIT 3
+
+/* Socket's Receive state machine */
+#define IN_PROGRESS_WAIT_HEADER 0x0
+#define IN_PROGRESS_HEADER_GATHER 0x1
+#define IN_PROGRESS_DATA_RECV 0x2
+
+/* Socket's Xmit state machine */
+#define IN_PROGRESS_XMIT_IMM 0x0
+#define IN_PROGRESS_XMIT_SCSI 0x1
+
+/* Task Mgmt states */
+#define TMABORT_INITIAL 0x0
+#define TMABORT_SUCCESS 0x1
+#define TMABORT_FAILED 0x2
+#define TMABORT_TIMEDOUT 0x3
+
+/* iSCSI Task Command's state machine */
+#define IN_PROGRESS_IDLE 0x0
+#define IN_PROGRESS_READ 0x1
+#define IN_PROGRESS_WRITE 0x2
+
+/* xmit state machine */
+#define XMSTATE_IDLE 0x0
+#define XMSTATE_R_HDR 0x1
+#define XMSTATE_W_HDR 0x2
+#define XMSTATE_IMM_HDR 0x4
+#define XMSTATE_IMM_DATA 0x8
+#define XMSTATE_UNS_INIT 0x10
+#define XMSTATE_UNS_HDR 0x20
+#define XMSTATE_UNS_DATA 0x40
+#define XMSTATE_SOL_HDR 0x80
+#define XMSTATE_SOL_DATA 0x100
+
+#define ISCSI_DRV_VERSION "0.1"
+#define ISCSI_DEFAULT_PORT 3260
+#define ISCSI_STRING_MAX 255
+#define ISCSI_NODE_NAME_MAX 255
+#define ISCSI_NODE_PORTAL_MAX 32
+#define ISCSI_ALIAS_NAME_MAX 255
+#define ISCSI_CONN_MAX 1
+#define ISCSI_PORTAL_MAX 1
+#define ISCSI_CONN_RCVBUF_MIN 262144
+#define ISCSI_CONN_SNDBUF_MIN 262144
+#define ISCSI_TEXT_SEPARATOR '='
+#define ISCSI_PAD_LEN 4
+#define ISCSI_DRAFT20_VERSION 0x00
+#define ISCSI_R2T_MAX 16
+#define ISCSI_XMIT_CMDS_MAX 64 /* must be power of 2 */
+#define ISCSI_IMM_CMDS_MAX 32 /* must be power of 2 */
+#define ISCSI_IMM_ITT_OFFSET 0x1000
+#define ISCSI_SG_TABLESIZE 128
+#define ISCSI_CMD_PER_LUN 128
+
+struct iscsi_queue {
+ struct kfifo *queue; /* FIFO Queue */
+ void **pool; /* Pool of elements */
+ int max; /* Max number of elements */
+};
+
+struct iscsi_session;
+struct iscsi_cmd_task;
+struct iscsi_mgmt_task;
+
+/* Socket connection recieve helper */
+struct iscsi_tcp_recv {
+ struct iscsi_hdr *hdr;
+ struct sk_buff *skb;
+ int offset;
+ int len;
+ int hdr_offset;
+ int copy;
+ int copied;
+ int padding;
+ struct iscsi_cmd_task *ctask; /* current cmd in progress */
+
+ /* copied and flipped values */
+ int opcode;
+ int flags;
+ int cmd_status;
+ int ahslen;
+ int datalen;
+ uint32_t itt;
+};
+
+struct iscsi_conn {
+ struct iscsi_hdr hdr; /* Header placeholder */
+ char hdrext[4*sizeof(__u16) +
+ sizeof(__u32)];
+ char *data; /* Data placeholder */
+ int data_copied;
+
+ /* iSCSI connection-wide sequencing */
+ uint32_t exp_statsn;
+ int hdr_size; /* PDU Header size pre-calc. */
+
+ /* control data */
+ int senselen; /* is data has sense? */
+ int cpu; /* binded CPU */
+ int busy;
+ int id; /* iSCSI CID */
+ struct iscsi_tcp_recv in; /* TCP receive context */
+ int in_progress; /* Connection state machine */
+ int in_progress_xmit; /* xmit state machine */
+ struct socket *sock; /* BSD socket layer */
+ struct iscsi_session *session; /* Parent session */
+ struct list_head item; /* item's list of connections */
+ struct kfifo *writequeue; /* Write response xmit queue */
+ struct kfifo *immqueue; /* Immediate xmit queue */
+ struct kfifo *xmitqueue; /* Data-path queue */
+ struct work_struct xmitwork; /* per-conn. xmit workqueue */
+ volatile int c_stage; /* Connection state */
+ iscsi_cnx_h handle; /* CP connection handle */
+ struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
+ spinlock_t lock; /* general connection lock */
+ volatile int suspend; /* connection suspended */
+ struct crypto_tfm *tx_tfm;
+ struct crypto_tfm *rx_tfm;
+ struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
+ struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
+ struct semaphore xmitsema;
+ wait_queue_head_t ehwait;
+ struct iscsi_tm tmhdr;
+ volatile int tmabort_state;
+ struct timer_list tmabort_timer;
+
+ /* configuration */
+ int max_recv_dlength;
+ int max_xmit_dlength;
+ int hdrdgst_en;
+ int datadgst_en;
+
+ /* old values for socket callbacks */
+ void (*old_data_ready)(struct sock *, int);
+ void (*old_state_change)(struct sock *);
+ void (*old_write_space)(struct sock *);
+};
+
+struct iscsi_session {
+ /* iSCSI session-wide sequencing */
+ uint32_t cmdsn;
+ uint32_t exp_cmdsn;
+ uint32_t max_cmdsn;
+
+ /* configuration */
+ int initial_r2t_en;
+ int max_r2t;
+ int imm_data_en;
+ int first_burst;
+ int max_burst;
+ int time2wait;
+ int time2retain;
+ int pdu_inorder_en;
+ int dataseq_inorder_en;
+ int erl;
+ int ifmarker_en;
+ int ofmarker_en;
+
+ /* control data */
+ struct Scsi_Host *host;
+ int id;
+ struct iscsi_conn *leadconn; /* Leading Conn. */
+ spinlock_t conn_lock;
+ spinlock_t lock;
+ volatile int state;
+ struct list_head item;
+ void *auth_client;
+ iscsi_snx_h handle; /* CP session handle */
+ int conn_cnt;
+
+ struct list_head connections; /* list of connects. */
+ int cmds_max; /* size of cmds array */
+ struct iscsi_cmd_task **cmds; /* Original Cmds arr */
+ struct iscsi_queue cmdpool; /* PDU's pool */
+ int imm_max; /* size of Imm array */
+ struct iscsi_mgmt_task **imm_cmds; /* Original Imm arr */
+ struct iscsi_queue immpool; /* Imm PDU's pool */
+};
+
+struct iscsi_buf {
+ struct scatterlist sg;
+ unsigned int sent;
+};
+
+struct iscsi_data_task {
+ struct iscsi_data hdr; /* PDU */
+ char hdrext[sizeof(__u32)]; /* Header-Digest */
+ struct list_head item; /* data queue item */
+};
+#define ISCSI_DTASK_DEFAULT_MAX ISCSI_SG_TABLESIZE * PAGE_SIZE / 512
+
+struct iscsi_mgmt_task {
+ struct iscsi_hdr hdr; /* mgmt. PDU */
+ char hdrext[sizeof(__u32)]; /* Header-Digest */
+ char *data; /* mgmt payload */
+ volatile int xmstate; /* mgmt xmit progress */
+ int data_count; /* counts data to be sent */
+ struct iscsi_buf headbuf; /* Header Buffer */
+ struct iscsi_buf sendbuf; /* in progress buffer */
+ int sent;
+ uint32_t itt; /* this ITT */
+};
+
+struct iscsi_r2t_info {
+ uint32_t ttt; /* copied from R2T */
+ uint32_t exp_statsn; /* copeid and incr. from R2T */
+ int data_length; /* copied from R2T */
+ int data_offset; /* copied from R2T */
+ struct iscsi_buf headbuf; /* Data-Out Header Buffer */
+ struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
+ int sent; /* R2T sequence progress */
+ int data_count; /* DATA-Out payload progress */
+ struct scatterlist *sg; /* per-R2T SG list */
+ int solicit_datasn;
+};
+
+struct iscsi_cmd_task {
+ struct iscsi_cmd hdr; /* orig. SCSI PDU */
+ char hdrext[4*sizeof(__u16)+ /* one AHS */
+ sizeof(__u32)]; /* Header-Digest */
+ int itt; /* this ITT */
+ int datasn; /* DataSN numbering */
+ struct iscsi_buf headbuf; /* Header Buffer */
+ struct iscsi_buf sendbuf; /* in progress buffer */
+ int sent;
+ struct scatterlist *sg; /* per-cmd SG list */
+ struct scatterlist *bad_sg; /* assert statement */
+ int sg_count; /* SG's to process */
+ uint32_t unsol_datasn;
+ uint32_t exp_r2tsn;
+ volatile int in_progress; /* State machine */
+ volatile int xmstate; /* Xmit State machine */
+ int imm_count; /* Imm-Data bytes */
+ int unsol_count; /* Imm-Data-Out bytes */
+ int r2t_data_count; /* R2T Data-Out bytes */
+ int data_count; /* Remaining Data-Out */
+ struct scsi_cmnd *sc; /* Assoc. SCSI cmnd */
+ int total_length;
+ int data_offset;
+ struct iscsi_conn *conn; /* used connection */
+
+ struct iscsi_r2t_info *r2t; /* in progress R2T */
+ struct iscsi_queue r2tpool;
+ struct kfifo *r2tqueue;
+ struct iscsi_r2t_info **r2ts;
+ struct list_head dataqueue; /* Data-Out dataqueue */
+ mempool_t *datapool;
+};
+
+#endif /* ISCSI_H */
next reply other threads:[~2005-03-07 7:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-07 7:04 Alex Aizman [this message]
2005-03-09 6:15 ` [ANNOUNCE 1/6] Open-iSCSI High-Performance Initiator for Linux Matt Mackall
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