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path: root/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
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Diffstat (limited to 'drivers/scsi/cxgb3i/cxgb3i_iscsi.c')
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_iscsi.c951
1 files changed, 951 insertions, 0 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
new file mode 100644
index 00000000000..d83464b9b3f
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -0,0 +1,951 @@
+/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
+ *
+ * Copyright (c) 2008 Chelsio Communications, Inc.
+ * Copyright (c) 2008 Mike Christie
+ * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ */
+
+#include <linux/inet.h>
+#include <linux/crypto.h>
+#include <net/tcp.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+#include <scsi/iscsi_proto.h>
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+
+#include "cxgb3i.h"
+#include "cxgb3i_pdu.h"
+
+#ifdef __DEBUG_CXGB3I_TAG__
+#define cxgb3i_tag_debug cxgb3i_log_debug
+#else
+#define cxgb3i_tag_debug(fmt...)
+#endif
+
+#ifdef __DEBUG_CXGB3I_API__
+#define cxgb3i_api_debug cxgb3i_log_debug
+#else
+#define cxgb3i_api_debug(fmt...)
+#endif
+
+/*
+ * align pdu size to multiple of 512 for better performance
+ */
+#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
+
+static struct scsi_transport_template *cxgb3i_scsi_transport;
+static struct scsi_host_template cxgb3i_host_template;
+static struct iscsi_transport cxgb3i_iscsi_transport;
+static unsigned char sw_tag_idx_bits;
+static unsigned char sw_tag_age_bits;
+
+static LIST_HEAD(cxgb3i_snic_list);
+static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
+
+/**
+ * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
+ * @t3dev: t3cdev adapter
+ * return the resulting cxgb3i_adapter struct
+ */
+struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
+{
+ struct cxgb3i_adapter *snic;
+ struct adapter *adapter = tdev2adap(t3dev);
+ int i;
+
+ snic = kzalloc(sizeof(*snic), GFP_KERNEL);
+ if (!snic) {
+ cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
+ return NULL;
+ }
+ spin_lock_init(&snic->lock);
+
+ snic->tdev = t3dev;
+ snic->pdev = adapter->pdev;
+ snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
+
+ if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
+ &snic->tx_max_size,
+ &snic->rx_max_size) < 0)
+ goto free_snic;
+
+ for_each_port(adapter, i) {
+ snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
+ if (!snic->hba[i])
+ goto ulp_cleanup;
+ }
+ snic->hba_cnt = adapter->params.nports;
+
+ /* add to the list */
+ write_lock(&cxgb3i_snic_rwlock);
+ list_add_tail(&snic->list_head, &cxgb3i_snic_list);
+ write_unlock(&cxgb3i_snic_rwlock);
+
+ return snic;
+
+ulp_cleanup:
+ cxgb3i_adapter_ddp_cleanup(t3dev);
+free_snic:
+ kfree(snic);
+ return NULL;
+}
+
+/**
+ * cxgb3i_adapter_remove - release all the resources held and cleanup any
+ * h/w settings
+ * @t3dev: t3cdev adapter
+ */
+void cxgb3i_adapter_remove(struct t3cdev *t3dev)
+{
+ int i;
+ struct cxgb3i_adapter *snic;
+
+ /* remove from the list */
+ write_lock(&cxgb3i_snic_rwlock);
+ list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
+ if (snic->tdev == t3dev) {
+ list_del(&snic->list_head);
+ break;
+ }
+ }
+ write_unlock(&cxgb3i_snic_rwlock);
+
+ if (snic) {
+ for (i = 0; i < snic->hba_cnt; i++) {
+ if (snic->hba[i]) {
+ cxgb3i_hba_host_remove(snic->hba[i]);
+ snic->hba[i] = NULL;
+ }
+ }
+
+ /* release ddp resources */
+ cxgb3i_adapter_ddp_cleanup(snic->tdev);
+ kfree(snic);
+ }
+}
+
+/**
+ * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
+ * net_device
+ * @t3dev: t3cdev adapter
+ */
+struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
+{
+ struct cxgb3i_adapter *snic;
+ int i;
+
+ read_lock(&cxgb3i_snic_rwlock);
+ list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
+ for (i = 0; i < snic->hba_cnt; i++) {
+ if (snic->hba[i]->ndev == ndev) {
+ read_unlock(&cxgb3i_snic_rwlock);
+ return snic->hba[i];
+ }
+ }
+ }
+ read_unlock(&cxgb3i_snic_rwlock);
+ return NULL;
+}
+
+/**
+ * cxgb3i_hba_host_add - register a new host with scsi/iscsi
+ * @snic: the cxgb3i adapter
+ * @ndev: associated net_device
+ */
+struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
+ struct net_device *ndev)
+{
+ struct cxgb3i_hba *hba;
+ struct Scsi_Host *shost;
+ int err;
+
+ shost = iscsi_host_alloc(&cxgb3i_host_template,
+ sizeof(struct cxgb3i_hba),
+ CXGB3I_SCSI_QDEPTH_DFLT);
+ if (!shost) {
+ cxgb3i_log_info("iscsi_host_alloc failed.\n");
+ return NULL;
+ }
+
+ shost->transportt = cxgb3i_scsi_transport;
+ shost->max_lun = CXGB3I_MAX_LUN;
+ shost->max_id = CXGB3I_MAX_TARGET;
+ shost->max_channel = 0;
+ shost->max_cmd_len = 16;
+
+ hba = iscsi_host_priv(shost);
+ hba->snic = snic;
+ hba->ndev = ndev;
+ hba->shost = shost;
+
+ pci_dev_get(snic->pdev);
+ err = iscsi_host_add(shost, &snic->pdev->dev);
+ if (err) {
+ cxgb3i_log_info("iscsi_host_add failed.\n");
+ goto pci_dev_put;
+ }
+
+ cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
+ shost, hba, shost->host_no);
+
+ return hba;
+
+pci_dev_put:
+ pci_dev_put(snic->pdev);
+ scsi_host_put(shost);
+ return NULL;
+}
+
+/**
+ * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
+ * @hba: the cxgb3i hba
+ */
+void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
+{
+ cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
+ hba->shost, hba, hba->shost->host_no);
+ iscsi_host_remove(hba->shost);
+ pci_dev_put(hba->snic->pdev);
+ iscsi_host_free(hba->shost);
+}
+
+/**
+ * cxgb3i_ep_connect - establish TCP connection to target portal
+ * @dst_addr: target IP address
+ * @non_blocking: blocking or non-blocking call
+ *
+ * Initiates a TCP/IP connection to the dst_addr
+ */
+static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
+ int non_blocking)
+{
+ struct iscsi_endpoint *ep;
+ struct cxgb3i_endpoint *cep;
+ struct cxgb3i_hba *hba;
+ struct s3_conn *c3cn = NULL;
+ int err = 0;
+
+ c3cn = cxgb3i_c3cn_create();
+ if (!c3cn) {
+ cxgb3i_log_info("ep connect OOM.\n");
+ err = -ENOMEM;
+ goto release_conn;
+ }
+
+ err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
+ if (err < 0) {
+ cxgb3i_log_info("ep connect failed.\n");
+ goto release_conn;
+ }
+ hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
+ if (!hba) {
+ err = -ENOSPC;
+ cxgb3i_log_info("NOT going through cxgbi device.\n");
+ goto release_conn;
+ }
+ if (c3cn_is_closing(c3cn)) {
+ err = -ENOSPC;
+ cxgb3i_log_info("ep connect unable to connect.\n");
+ goto release_conn;
+ }
+
+ ep = iscsi_create_endpoint(sizeof(*cep));
+ if (!ep) {
+ err = -ENOMEM;
+ cxgb3i_log_info("iscsi alloc ep, OOM.\n");
+ goto release_conn;
+ }
+ cep = ep->dd_data;
+ cep->c3cn = c3cn;
+ cep->hba = hba;
+
+ cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
+ ep, cep, c3cn, hba);
+ return ep;
+
+release_conn:
+ cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
+ if (c3cn)
+ cxgb3i_c3cn_release(c3cn);
+ return ERR_PTR(err);
+}
+
+/**
+ * cxgb3i_ep_poll - polls for TCP connection establishement
+ * @ep: TCP connection (endpoint) handle
+ * @timeout_ms: timeout value in milli secs
+ *
+ * polls for TCP connect request to complete
+ */
+static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
+{
+ struct cxgb3i_endpoint *cep = ep->dd_data;
+ struct s3_conn *c3cn = cep->c3cn;
+
+ if (!c3cn_is_established(c3cn))
+ return 0;
+ cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
+ return 1;
+}
+
+/**
+ * cxgb3i_ep_disconnect - teardown TCP connection
+ * @ep: TCP connection (endpoint) handle
+ *
+ * teardown TCP connection
+ */
+static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
+{
+ struct cxgb3i_endpoint *cep = ep->dd_data;
+ struct cxgb3i_conn *cconn = cep->cconn;
+
+ cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
+
+ if (cconn && cconn->conn) {
+ /*
+ * stop the xmit path so the xmit_pdu function is
+ * not being called
+ */
+ iscsi_suspend_tx(cconn->conn);
+
+ write_lock_bh(&cep->c3cn->callback_lock);
+ cep->c3cn->user_data = NULL;
+ cconn->cep = NULL;
+ write_unlock_bh(&cep->c3cn->callback_lock);
+ }
+
+ cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
+ ep, cep, cep->c3cn);
+ cxgb3i_c3cn_release(cep->c3cn);
+ iscsi_destroy_endpoint(ep);
+}
+
+/**
+ * cxgb3i_session_create - create a new iscsi session
+ * @cmds_max: max # of commands
+ * @qdepth: scsi queue depth
+ * @initial_cmdsn: initial iscsi CMDSN for this session
+ * @host_no: pointer to return host no
+ *
+ * Creates a new iSCSI session
+ */
+static struct iscsi_cls_session *
+cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
+ u32 initial_cmdsn, u32 *host_no)
+{
+ struct cxgb3i_endpoint *cep;
+ struct cxgb3i_hba *hba;
+ struct Scsi_Host *shost;
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+
+ if (!ep) {
+ cxgb3i_log_error("%s, missing endpoint.\n", __func__);
+ return NULL;
+ }
+
+ cep = ep->dd_data;
+ hba = cep->hba;
+ shost = hba->shost;
+ cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
+ BUG_ON(hba != iscsi_host_priv(shost));
+
+ *host_no = shost->host_no;
+
+ cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
+ cmds_max,
+ sizeof(struct iscsi_tcp_task),
+ initial_cmdsn, ISCSI_MAX_TARGET);
+ if (!cls_session)
+ return NULL;
+ session = cls_session->dd_data;
+ if (iscsi_tcp_r2tpool_alloc(session))
+ goto remove_session;
+
+ return cls_session;
+
+remove_session:
+ iscsi_session_teardown(cls_session);
+ return NULL;
+}
+
+/**
+ * cxgb3i_session_destroy - destroys iscsi session
+ * @cls_session: pointer to iscsi cls session
+ *
+ * Destroys an iSCSI session instance and releases its all resources held
+ */
+static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
+{
+ cxgb3i_api_debug("sess 0x%p.\n", cls_session);
+ iscsi_tcp_r2tpool_free(cls_session->dd_data);
+ iscsi_session_teardown(cls_session);
+}
+
+/**
+ * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
+ * reduce it to be within the hardware limit if needed
+ * @conn: iscsi connection
+ */
+static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
+
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+ cconn->hba->snic->tx_max_size -
+ ISCSI_PDU_NONPAYLOAD_MAX);
+
+ if (conn->max_xmit_dlength)
+ conn->max_xmit_dlength = min_t(unsigned int,
+ conn->max_xmit_dlength, max);
+ else
+ conn->max_xmit_dlength = max;
+ align_pdu_size(conn->max_xmit_dlength);
+ cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
+ conn, conn->max_xmit_dlength);
+ return 0;
+}
+
+/**
+ * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
+ * the hardware limit
+ * @conn: iscsi connection
+ * return 0 if the value is valid, < 0 otherwise.
+ */
+static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+ cconn->hba->snic->rx_max_size -
+ ISCSI_PDU_NONPAYLOAD_MAX);
+
+ align_pdu_size(max);
+ if (conn->max_recv_dlength) {
+ if (conn->max_recv_dlength > max) {
+ cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
+ " Need to be <= %u.\n",
+ conn->max_recv_dlength, max);
+ return -EINVAL;
+ }
+ conn->max_recv_dlength = min_t(unsigned int,
+ conn->max_recv_dlength, max);
+ align_pdu_size(conn->max_recv_dlength);
+ } else
+ conn->max_recv_dlength = max;
+ cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
+ conn, conn->max_recv_dlength);
+ return 0;
+}
+
+/**
+ * cxgb3i_conn_create - create iscsi connection instance
+ * @cls_session: pointer to iscsi cls session
+ * @cid: iscsi cid
+ *
+ * Creates a new iSCSI connection instance for a given session
+ */
+static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
+ *cls_session, u32 cid)
+{
+ struct iscsi_cls_conn *cls_conn;
+ struct iscsi_conn *conn;
+ struct iscsi_tcp_conn *tcp_conn;
+ struct cxgb3i_conn *cconn;
+
+ cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
+
+ cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+ tcp_conn = conn->dd_data;
+ cconn = tcp_conn->dd_data;
+
+ cconn->conn = conn;
+ return cls_conn;
+}
+
+/**
+ * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
+ * @cls_session: pointer to iscsi cls session
+ * @cls_conn: pointer to iscsi cls conn
+ * @transport_eph: 64-bit EP handle
+ * @is_leading: leading connection on this session?
+ *
+ * Binds together an iSCSI session, an iSCSI connection and a
+ * TCP connection. This routine returns error code if the TCP
+ * connection does not belong on the device iSCSI sess/conn is bound
+ */
+
+static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn,
+ u64 transport_eph, int is_leading)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ struct cxgb3i_adapter *snic;
+ struct iscsi_endpoint *ep;
+ struct cxgb3i_endpoint *cep;
+ struct s3_conn *c3cn;
+ int err;
+
+ ep = iscsi_lookup_endpoint(transport_eph);
+ if (!ep)
+ return -EINVAL;
+
+ /* setup ddp pagesize */
+ cep = ep->dd_data;
+ c3cn = cep->c3cn;
+ snic = cep->hba->snic;
+ err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
+ if (err < 0)
+ return err;
+
+ cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
+ ep, cls_session, cls_conn);
+
+ err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (err)
+ return -EINVAL;
+
+ /* calculate the tag idx bits needed for this conn based on cmds_max */
+ cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
+ cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
+ conn->session->cmds_max, cconn->task_idx_bits);
+
+ read_lock(&c3cn->callback_lock);
+ c3cn->user_data = conn;
+ cconn->hba = cep->hba;
+ cconn->cep = cep;
+ cep->cconn = cconn;
+ read_unlock(&c3cn->callback_lock);
+
+ cxgb3i_conn_max_xmit_dlength(conn);
+ cxgb3i_conn_max_recv_dlength(conn);
+
+ spin_lock_bh(&conn->session->lock);
+ sprintf(conn->portal_address, NIPQUAD_FMT,
+ NIPQUAD(c3cn->daddr.sin_addr.s_addr));
+ conn->portal_port = ntohs(c3cn->daddr.sin_port);
+ spin_unlock_bh(&conn->session->lock);
+
+ /* init recv engine */
+ iscsi_tcp_hdr_recv_prep(tcp_conn);
+
+ return 0;
+}
+
+/**
+ * cxgb3i_conn_get_param - return iscsi connection parameter to caller
+ * @cls_conn: pointer to iscsi cls conn
+ * @param: parameter type identifier
+ * @buf: buffer pointer
+ *
+ * returns iSCSI connection parameters
+ */
+static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ int len;
+
+ cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
+
+ switch (param) {
+ case ISCSI_PARAM_CONN_PORT:
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%hu\n", conn->portal_port);
+ spin_unlock_bh(&conn->session->lock);
+ break;
+ case ISCSI_PARAM_CONN_ADDRESS:
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%s\n", conn->portal_address);
+ spin_unlock_bh(&conn->session->lock);
+ break;
+ default:
+ return iscsi_conn_get_param(cls_conn, param, buf);
+ }
+
+ return len;
+}
+
+/**
+ * cxgb3i_conn_set_param - set iscsi connection parameter
+ * @cls_conn: pointer to iscsi cls conn
+ * @param: parameter type identifier
+ * @buf: buffer pointer
+ * @buflen: buffer length
+ *
+ * set iSCSI connection parameters
+ */
+static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf, int buflen)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_session *session = conn->session;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ struct cxgb3i_adapter *snic = cconn->hba->snic;
+ struct s3_conn *c3cn = cconn->cep->c3cn;
+ int value, err = 0;
+
+ switch (param) {
+ case ISCSI_PARAM_HDRDGST_EN:
+ err = iscsi_set_param(cls_conn, param, buf, buflen);
+ if (!err && conn->hdrdgst_en)
+ err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
+ conn->hdrdgst_en,
+ conn->datadgst_en, 0);
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ err = iscsi_set_param(cls_conn, param, buf, buflen);
+ if (!err && conn->datadgst_en)
+ err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
+ conn->hdrdgst_en,
+ conn->datadgst_en, 0);
+ break;
+ case ISCSI_PARAM_MAX_R2T:
+ sscanf(buf, "%d", &value);
+ if (value <= 0 || !is_power_of_2(value))
+ return -EINVAL;
+ if (session->max_r2t == value)
+ break;
+ iscsi_tcp_r2tpool_free(session);
+ err = iscsi_set_param(cls_conn, param, buf, buflen);
+ if (!err && iscsi_tcp_r2tpool_alloc(session))
+ return -ENOMEM;
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ err = iscsi_set_param(cls_conn, param, buf, buflen);
+ if (!err)
+ err = cxgb3i_conn_max_recv_dlength(conn);
+ break;
+ case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+ err = iscsi_set_param(cls_conn, param, buf, buflen);
+ if (!err)
+ err = cxgb3i_conn_max_xmit_dlength(conn);
+ break;
+ default:
+ return iscsi_set_param(cls_conn, param, buf, buflen);
+ }
+ return err;
+}
+
+/**
+ * cxgb3i_host_set_param - configure host (adapter) related parameters
+ * @shost: scsi host pointer
+ * @param: parameter type identifier
+ * @buf: buffer pointer
+ */
+static int cxgb3i_host_set_param(struct Scsi_Host *shost,
+ enum iscsi_host_param param,
+ char *buf, int buflen)
+{
+ struct cxgb3i_hba *hba = iscsi_host_priv(shost);
+
+ cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
+
+ switch (param) {
+ case ISCSI_HOST_PARAM_IPADDRESS:
+ {
+ __be32 addr = in_aton(buf);
+ cxgb3i_set_private_ipv4addr(hba->ndev, addr);
+ return 0;
+ }
+ case ISCSI_HOST_PARAM_HWADDRESS:
+ case ISCSI_HOST_PARAM_NETDEV_NAME:
+ /* ignore */
+ return 0;
+ default:
+ return iscsi_host_set_param(shost, param, buf, buflen);
+ }
+}
+
+/**
+ * cxgb3i_host_get_param - returns host (adapter) related parameters
+ * @shost: scsi host pointer
+ * @param: parameter type identifier
+ * @buf: buffer pointer
+ */
+static int cxgb3i_host_get_param(struct Scsi_Host *shost,
+ enum iscsi_host_param param, char *buf)
+{
+ struct cxgb3i_hba *hba = iscsi_host_priv(shost);
+ int len = 0;
+
+ cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
+
+ switch (param) {
+ case ISCSI_HOST_PARAM_HWADDRESS:
+ len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
+ break;
+ case ISCSI_HOST_PARAM_NETDEV_NAME:
+ len = sprintf(buf, "%s\n", hba->ndev->name);
+ break;
+ case ISCSI_HOST_PARAM_IPADDRESS:
+ {
+ __be32 addr;
+
+ addr = cxgb3i_get_private_ipv4addr(hba->ndev);
+ len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
+ break;
+ }
+ default:
+ return iscsi_host_get_param(shost, param, buf);
+ }
+ return len;
+}
+
+/**
+ * cxgb3i_conn_get_stats - returns iSCSI stats
+ * @cls_conn: pointer to iscsi cls conn
+ * @stats: pointer to iscsi statistic struct
+ */
+static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+ struct iscsi_stats *stats)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+
+ stats->txdata_octets = conn->txdata_octets;
+ stats->rxdata_octets = conn->rxdata_octets;
+ stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
+ stats->dataout_pdus = conn->dataout_pdus_cnt;
+ stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
+ stats->datain_pdus = conn->datain_pdus_cnt;
+ stats->r2t_pdus = conn->r2t_pdus_cnt;
+ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+ stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+ stats->digest_err = 0;
+ stats->timeout_err = 0;
+ stats->custom_length = 1;
+ strcpy(stats->custom[0].desc, "eh_abort_cnt");
+ stats->custom[0].value = conn->eh_abort_cnt;
+}
+
+/**
+ * cxgb3i_parse_itt - get the idx and age bits from a given tag
+ * @conn: iscsi connection
+ * @itt: itt tag
+ * @idx: task index, filled in by this function
+ * @age: session age, filled in by this function
+ */
+static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
+ int *idx, int *age)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ struct cxgb3i_adapter *snic = cconn->hba->snic;
+ u32 tag = ntohl((__force u32) itt);
+ u32 sw_bits;
+
+ sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
+ if (idx)
+ *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
+ if (age)
+ *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
+
+ cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
+ tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
+ age ? *age : 0xFF);
+}
+
+/**
+ * cxgb3i_reserve_itt - generate tag for a give task
+ * Try to set up ddp for a scsi read task.
+ * @task: iscsi task
+ * @hdr_itt: tag, filled in by this function
+ */
+int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
+{
+ struct scsi_cmnd *sc = task->sc;
+ struct iscsi_conn *conn = task->conn;
+ struct iscsi_session *sess = conn->session;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ struct cxgb3i_adapter *snic = cconn->hba->snic;
+ struct cxgb3i_tag_format *tformat = &snic->tag_format;
+ u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
+ u32 tag;
+ int err = -EINVAL;
+
+ if (sc &&
+ (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
+ cxgb3i_sw_tag_usable(tformat, sw_tag)) {
+ struct s3_conn *c3cn = cconn->cep->c3cn;
+ struct cxgb3i_gather_list *gl;
+
+ gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
+ scsi_in(sc)->table.sgl,
+ scsi_in(sc)->table.nents,
+ snic->pdev,
+ GFP_ATOMIC);
+ if (gl) {
+ tag = sw_tag;
+ err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
+ tformat, &tag,
+ gl, GFP_ATOMIC);
+ if (err < 0)
+ cxgb3i_ddp_release_gl(gl, snic->pdev);
+ }
+ }
+
+ if (err < 0)
+ tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
+ /* the itt need to sent in big-endian order */
+ *hdr_itt = (__force itt_t)htonl(tag);
+
+ cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
+ tag, *hdr_itt, task->itt, sess->age);
+ return 0;
+}
+
+/**
+ * cxgb3i_release_itt - release the tag for a given task
+ * if the tag is a ddp tag, release the ddp setup
+ * @task: iscsi task
+ * @hdr_itt: tag
+ */
+void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
+{
+ struct scsi_cmnd *sc = task->sc;
+ struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
+ struct cxgb3i_conn *cconn = tcp_conn->dd_data;
+ struct cxgb3i_adapter *snic = cconn->hba->snic;
+ struct cxgb3i_tag_format *tformat = &snic->tag_format;
+ u32 tag = ntohl((__force u32)hdr_itt);
+
+ cxgb3i_tag_debug("release tag 0x%x.\n", tag);
+
+ if (sc &&
+ (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
+ cxgb3i_is_ddp_tag(tformat, tag))
+ cxgb3i_ddp_tag_release(snic->tdev, tag);
+}
+
+/**
+ * cxgb3i_host_template -- Scsi_Host_Template structure
+ * used when registering with the scsi mid layer
+ */
+static struct scsi_host_template cxgb3i_host_template = {
+ .module = THIS_MODULE,
+ .name = "Chelsio S3xx iSCSI Initiator",
+ .proc_name = "cxgb3i",
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = iscsi_change_queue_depth,
+ .can_queue = 128 * (ISCSI_DEF_XMIT_CMDS_MAX - 1),
+ .sg_tablesize = SG_ALL,
+ .max_sectors = 0xFFFF,
+ .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_device_reset_handler = iscsi_eh_device_reset,
+ .eh_target_reset_handler = iscsi_eh_target_reset,
+ .use_clustering = DISABLE_CLUSTERING,
+ .this_id = -1,
+};
+
+static struct iscsi_transport cxgb3i_iscsi_transport = {
+ .owner = THIS_MODULE,
+ .name = "cxgb3i",
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
+ | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
+ CAP_PADDING_OFFLOAD,
+ .param_mask = ISCSI_MAX_RECV_DLENGTH |
+ ISCSI_MAX_XMIT_DLENGTH |
+ ISCSI_HDRDGST_EN |
+ ISCSI_DATADGST_EN |
+ ISCSI_INITIAL_R2T_EN |
+ ISCSI_MAX_R2T |
+ ISCSI_IMM_DATA_EN |
+ ISCSI_FIRST_BURST |
+ ISCSI_MAX_BURST |
+ ISCSI_PDU_INORDER_EN |
+ ISCSI_DATASEQ_INORDER_EN |
+ ISCSI_ERL |
+ ISCSI_CONN_PORT |
+ ISCSI_CONN_ADDRESS |
+ ISCSI_EXP_STATSN |
+ ISCSI_PERSISTENT_PORT |
+ ISCSI_PERSISTENT_ADDRESS |
+ ISCSI_TARGET_NAME | ISCSI_TPGT |
+ ISCSI_USERNAME | ISCSI_PASSWORD |
+ ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+ ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+ ISCSI_LU_RESET_TMO |
+ ISCSI_PING_TMO | ISCSI_RECV_TMO |
+ ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
+ .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
+ ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
+ .get_host_param = cxgb3i_host_get_param,
+ .set_host_param = cxgb3i_host_set_param,
+ /* session management */
+ .create_session = cxgb3i_session_create,
+ .destroy_session = cxgb3i_session_destroy,
+ .get_session_param = iscsi_session_get_param,
+ /* connection management */
+ .create_conn = cxgb3i_conn_create,
+ .bind_conn = cxgb3i_conn_bind,
+ .destroy_conn = iscsi_tcp_conn_teardown,
+ .start_conn = iscsi_conn_start,
+ .stop_conn = iscsi_conn_stop,
+ .get_conn_param = cxgb3i_conn_get_param,
+ .set_param = cxgb3i_conn_set_param,
+ .get_stats = cxgb3i_conn_get_stats,
+ /* pdu xmit req. from user space */
+ .send_pdu = iscsi_conn_send_pdu,
+ /* task */
+ .init_task = iscsi_tcp_task_init,
+ .xmit_task = iscsi_tcp_task_xmit,
+ .cleanup_task = cxgb3i_conn_cleanup_task,
+
+ /* pdu */
+ .alloc_pdu = cxgb3i_conn_alloc_pdu,
+ .init_pdu = cxgb3i_conn_init_pdu,
+ .xmit_pdu = cxgb3i_conn_xmit_pdu,
+ .parse_pdu_itt = cxgb3i_parse_itt,
+
+ /* TCP connect/disconnect */
+ .ep_connect = cxgb3i_ep_connect,
+ .ep_poll = cxgb3i_ep_poll,
+ .ep_disconnect = cxgb3i_ep_disconnect,
+ /* Error recovery timeout call */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
+};
+
+int cxgb3i_iscsi_init(void)
+{
+ sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
+ sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
+ cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
+ ISCSI_ITT_MASK, sw_tag_idx_bits,
+ ISCSI_AGE_MASK, sw_tag_age_bits);
+
+ cxgb3i_scsi_transport =
+ iscsi_register_transport(&cxgb3i_iscsi_transport);
+ if (!cxgb3i_scsi_transport) {
+ cxgb3i_log_error("Could not register cxgb3i transport.\n");
+ return -ENODEV;
+ }
+ cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
+ return 0;
+}
+
+void cxgb3i_iscsi_cleanup(void)
+{
+ if (cxgb3i_scsi_transport) {
+ cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
+ cxgb3i_scsi_transport);
+ iscsi_unregister_transport(&cxgb3i_iscsi_transport);
+ }
+}