/* 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 <linux/if_vlan.h>
#include <net/dst.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_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
* @tdev: t3cdev pointer
*/
struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
{
struct cxgb3i_adapter *snic;
read_lock(&cxgb3i_snic_rwlock);
list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
if (snic->tdev == tdev) {
read_unlock(&cxgb3i_snic_rwlock);
return snic;
}
}
read_unlock(&cxgb3i_snic_rwlock);
return NULL;
}
static inline int adapter_update(struct cxgb3i_adapter *snic)
{
cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
snic, snic->tdev);
return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
&snic->tx_max_size,
&snic->rx_max_size);
}
static int adapter_add(struct cxgb3i_adapter *snic)
{
struct t3cdev *t3dev = snic->tdev;
struct adapter *adapter = tdev2adap(t3dev);
int i, err;
snic->pdev = adapter->pdev;
snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
&snic->tx_max_size,
&snic->rx_max_size);
if (err < 0)
return err;
for_each_port(adapter, i) {
snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
if (!snic->hba[i])
return -EINVAL;
}
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);
cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
t3dev, snic, snic->hba_cnt);
return 0;
}
/**
* cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
* @t3dev: t3cdev adapter
*/
void cxgb3i_adapter_open(struct t3cdev *t3dev)
{
struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
int err;
if (snic)
err = adapter_update(snic);
else {
snic = kzalloc(sizeof(*snic), GFP_KERNEL);
if (snic) {
spin_lock_init(&snic->lock);
snic->tdev = t3dev;
err = adapter_add(snic);
} else
err = -ENOMEM;
}
if (err < 0) {
cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
snic, snic ? snic->flags : 0, t3dev, err);
if (snic) {
snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
cxgb3i_adapter_close(t3dev);
}
}
}
/**
* cxgb3i_adapter_close - release the resources held and cleanup h/w settings
* @t3dev: t3cdev adapter
*/
void cxgb3i_adapter_close(struct t3cdev *t3dev)
{
struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
int i;
if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
t3dev, snic, snic ? snic->flags : 0);
return;
}
/* remove from the list */
write_lock(&cxgb3i_snic_rwlock);
list_del(&snic->list_head);
write_unlock(&cxgb3i_snic_rwlock);
for (i = 0; i < snic->hba_cnt; i++) {
if (snic->hba[i]) {
cxgb3i_hba_host_remove(snic->hba[i]);
snic->hba[i] = NULL;
}
}
cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
t3dev, snic, snic->hba_cnt);
kfree(snic);
}
/**
* cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
* @t3dev: t3cdev adapter
*/
static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
{
struct cxgb3i_adapter *snic;
int i;
if (ndev->priv_flags & IFF_802_1Q_VLAN)
ndev = vlan_dev_real_dev(ndev);
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), 1);
if (!shost) {
cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
snic, ndev);
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("snic 0x%p, ndev 0x%p, host_add failed.\n",
snic, ndev);
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
* @shost: scsi host to use
* @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 Scsi_Host *shost,
struct sockaddr *dst_addr,
int non_blocking)
{
struct iscsi_endpoint *ep;
struct cxgb3i_endpoint *cep;
struct cxgb3i_hba *hba = NULL;
struct s3_conn *c3cn = NULL;
int err = 0;
if (shost)
hba = iscsi_host_priv(shost);
cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
c3cn = cxgb3i_c3cn_create();
if (!c3cn) {
cxgb3i_log_info("ep connect OOM.\n");
err = -ENOMEM;
goto release_conn;
}
err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, 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 (shost && hba != iscsi_host_priv(shost)) {
err = -ENOSPC;
cxgb3i_log_info("Could not connect through request host%u\n",
shost->host_no);
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
*
* 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)
{
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));
cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
cmds_max, 0,
sizeof(struct iscsi_tcp_task) +
sizeof(struct cxgb3i_task_data),
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 -- calc the max. xmit pdu segment size
* @conn: iscsi connection
* check the max. xmit pdu payload, reduce it if needed
*/
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 = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
max = min(cconn->hba->snic->tx_max_size, max);
if (conn->max_xmit_dlength)
conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
else
conn->max_xmit_dlength = max;
align_pdu_size(conn->max_xmit_dlength);
cxgb3i_api_debug("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
* @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 = cconn->hba->snic->rx_max_size;
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(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, "%pI4", &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);
if (!hba->ndev) {
shost_printk(KERN_ERR, shost, "Could not set host param. "
"Netdev for host not set.\n");
return -ENODEV;
}
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;
if (!hba->ndev) {
shost_printk(KERN_ERR, shost, "Could not set host param. "
"Netdev for host not set.\n");
return -ENODEV;
}
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, "%pI4", &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
* @task: iscsi task
* @hdr_itt: tag, filled in by this function
* Set up ddp for scsi read tasks if possible.
*/
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
* @task: iscsi task
* @hdr_itt: tag
* If the tag is a ddp tag, release the ddp setup
*/
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 = CXGB3I_SCSI_HOST_QDEPTH,
.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,
.target_alloc = iscsi_target_alloc,
.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_TGT_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);
}
}
