linux/drivers/scsi/cxgb3i/cxgb3i_iscsi.c

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/* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.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_recover_target,
.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);
}
}