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linux/drivers/scsi/cxgbi/libcxgbi.c

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/*
* libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
*
* Copyright (c) 2010 Chelsio Communications, Inc.
*
* 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)
* Written by: Rakesh Ranjan (rranjan@chelsio.com)
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/skbuff.h>
#include <linux/crypto.h>
#include <linux/scatterlist.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <linux/if_vlan.h>
#include <linux/inet.h>
#include <net/dst.h>
#include <net/route.h>
#include <linux/inetdevice.h> /* ip_dev_find */
#include <net/tcp.h>
static unsigned int dbg_level;
#include "libcxgbi.h"
#define DRV_MODULE_NAME "libcxgbi"
#define DRV_MODULE_DESC "Chelsio iSCSI driver library"
#define DRV_MODULE_VERSION "0.9.0"
#define DRV_MODULE_RELDATE "Jun. 2010"
MODULE_AUTHOR("Chelsio Communications, Inc.");
MODULE_DESCRIPTION(DRV_MODULE_DESC);
MODULE_VERSION(DRV_MODULE_VERSION);
MODULE_LICENSE("GPL");
module_param(dbg_level, uint, 0644);
MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
/*
* cxgbi device management
* maintains a list of the cxgbi devices
*/
static LIST_HEAD(cdev_list);
static DEFINE_MUTEX(cdev_mutex);
int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
unsigned int max_conn)
{
struct cxgbi_ports_map *pmap = &cdev->pmap;
pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
sizeof(struct cxgbi_sock *),
GFP_KERNEL);
if (!pmap->port_csk) {
pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
return -ENOMEM;
}
pmap->max_connect = max_conn;
pmap->sport_base = base;
spin_lock_init(&pmap->lock);
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
{
struct cxgbi_ports_map *pmap = &cdev->pmap;
struct cxgbi_sock *csk;
int i;
for (i = 0; i < pmap->max_connect; i++) {
if (pmap->port_csk[i]) {
csk = pmap->port_csk[i];
pmap->port_csk[i] = NULL;
log_debug(1 << CXGBI_DBG_SOCK,
"csk 0x%p, cdev 0x%p, offload down.\n",
csk, cdev);
spin_lock_bh(&csk->lock);
cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
cxgbi_sock_closed(csk);
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
}
}
}
EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
{
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p# %u.\n", cdev, cdev->nports);
cxgbi_hbas_remove(cdev);
cxgbi_device_portmap_cleanup(cdev);
if (cdev->dev_ddp_cleanup)
cdev->dev_ddp_cleanup(cdev);
else
cxgbi_ddp_cleanup(cdev);
if (cdev->ddp)
cxgbi_ddp_cleanup(cdev);
if (cdev->pmap.max_connect)
cxgbi_free_big_mem(cdev->pmap.port_csk);
kfree(cdev);
}
struct cxgbi_device *cxgbi_device_register(unsigned int extra,
unsigned int nports)
{
struct cxgbi_device *cdev;
cdev = kzalloc(sizeof(*cdev) + extra + nports *
(sizeof(struct cxgbi_hba *) +
sizeof(struct net_device *)),
GFP_KERNEL);
if (!cdev) {
pr_warn("nport %d, OOM.\n", nports);
return NULL;
}
cdev->ports = (struct net_device **)(cdev + 1);
cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
sizeof(struct net_device *));
if (extra)
cdev->dd_data = ((char *)cdev->hbas) +
nports * sizeof(struct cxgbi_hba *);
spin_lock_init(&cdev->pmap.lock);
mutex_lock(&cdev_mutex);
list_add_tail(&cdev->list_head, &cdev_list);
mutex_unlock(&cdev_mutex);
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p# %u.\n", cdev, nports);
return cdev;
}
EXPORT_SYMBOL_GPL(cxgbi_device_register);
void cxgbi_device_unregister(struct cxgbi_device *cdev)
{
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p# %u,%s.\n",
cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
mutex_lock(&cdev_mutex);
list_del(&cdev->list_head);
mutex_unlock(&cdev_mutex);
cxgbi_device_destroy(cdev);
}
EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
void cxgbi_device_unregister_all(unsigned int flag)
{
struct cxgbi_device *cdev, *tmp;
mutex_lock(&cdev_mutex);
list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
if ((cdev->flags & flag) == flag) {
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p# %u,%s.\n",
cdev, cdev->nports, cdev->nports ?
cdev->ports[0]->name : "");
list_del(&cdev->list_head);
cxgbi_device_destroy(cdev);
}
}
mutex_unlock(&cdev_mutex);
}
EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
{
struct cxgbi_device *cdev, *tmp;
mutex_lock(&cdev_mutex);
list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
if (cdev->lldev == lldev) {
mutex_unlock(&cdev_mutex);
return cdev;
}
}
mutex_unlock(&cdev_mutex);
log_debug(1 << CXGBI_DBG_DEV,
"lldev 0x%p, NO match found.\n", lldev);
return NULL;
}
EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
int *port)
{
struct net_device *vdev = NULL;
struct cxgbi_device *cdev, *tmp;
int i;
if (ndev->priv_flags & IFF_802_1Q_VLAN) {
vdev = ndev;
ndev = vlan_dev_real_dev(ndev);
log_debug(1 << CXGBI_DBG_DEV,
"vlan dev %s -> %s.\n", vdev->name, ndev->name);
}
mutex_lock(&cdev_mutex);
list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
for (i = 0; i < cdev->nports; i++) {
if (ndev == cdev->ports[i]) {
cdev->hbas[i]->vdev = vdev;
mutex_unlock(&cdev_mutex);
if (port)
*port = i;
return cdev;
}
}
}
mutex_unlock(&cdev_mutex);
log_debug(1 << CXGBI_DBG_DEV,
"ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
return NULL;
}
void cxgbi_hbas_remove(struct cxgbi_device *cdev)
{
int i;
struct cxgbi_hba *chba;
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p#%u.\n", cdev, cdev->nports);
for (i = 0; i < cdev->nports; i++) {
chba = cdev->hbas[i];
if (chba) {
cdev->hbas[i] = NULL;
iscsi_host_remove(chba->shost);
pci_dev_put(cdev->pdev);
iscsi_host_free(chba->shost);
}
}
}
EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
unsigned int max_id, struct scsi_host_template *sht,
struct scsi_transport_template *stt)
{
struct cxgbi_hba *chba;
struct Scsi_Host *shost;
int i, err;
log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
for (i = 0; i < cdev->nports; i++) {
shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
if (!shost) {
pr_info("0x%p, p%d, %s, host alloc failed.\n",
cdev, i, cdev->ports[i]->name);
err = -ENOMEM;
goto err_out;
}
shost->transportt = stt;
shost->max_lun = max_lun;
shost->max_id = max_id;
shost->max_channel = 0;
shost->max_cmd_len = 16;
chba = iscsi_host_priv(shost);
chba->cdev = cdev;
chba->ndev = cdev->ports[i];
chba->shost = shost;
log_debug(1 << CXGBI_DBG_DEV,
"cdev 0x%p, p#%d %s: chba 0x%p.\n",
cdev, i, cdev->ports[i]->name, chba);
pci_dev_get(cdev->pdev);
err = iscsi_host_add(shost, &cdev->pdev->dev);
if (err) {
pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
cdev, i, cdev->ports[i]->name);
pci_dev_put(cdev->pdev);
scsi_host_put(shost);
goto err_out;
}
cdev->hbas[i] = chba;
}
return 0;
err_out:
cxgbi_hbas_remove(cdev);
return err;
}
EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
/*
* iSCSI offload
*
* - source port management
* To find a free source port in the port allocation map we use a very simple
* rotor scheme to look for the next free port.
*
* If a source port has been specified make sure that it doesn't collide with
* our normal source port allocation map. If it's outside the range of our
* allocation/deallocation scheme just let them use it.
*
* If the source port is outside our allocation range, the caller is
* responsible for keeping track of their port usage.
*/
static int sock_get_port(struct cxgbi_sock *csk)
{
struct cxgbi_device *cdev = csk->cdev;
struct cxgbi_ports_map *pmap = &cdev->pmap;
unsigned int start;
int idx;
if (!pmap->max_connect) {
pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
cdev, csk->port_id, cdev->ports[csk->port_id]->name);
return -EADDRNOTAVAIL;
}
if (csk->saddr.sin_port) {
pr_err("source port NON-ZERO %u.\n",
ntohs(csk->saddr.sin_port));
return -EADDRINUSE;
}
spin_lock_bh(&pmap->lock);
if (pmap->used >= pmap->max_connect) {
spin_unlock_bh(&pmap->lock);
pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
cdev, csk->port_id, cdev->ports[csk->port_id]->name);
return -EADDRNOTAVAIL;
}
start = idx = pmap->next;
do {
if (++idx >= pmap->max_connect)
idx = 0;
if (!pmap->port_csk[idx]) {
pmap->used++;
csk->saddr.sin_port =
htons(pmap->sport_base + idx);
pmap->next = idx;
pmap->port_csk[idx] = csk;
spin_unlock_bh(&pmap->lock);
cxgbi_sock_get(csk);
log_debug(1 << CXGBI_DBG_SOCK,
"cdev 0x%p, p#%u %s, p %u, %u.\n",
cdev, csk->port_id,
cdev->ports[csk->port_id]->name,
pmap->sport_base + idx, pmap->next);
return 0;
}
} while (idx != start);
spin_unlock_bh(&pmap->lock);
/* should not happen */
pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
cdev, csk->port_id, cdev->ports[csk->port_id]->name,
pmap->next);
return -EADDRNOTAVAIL;
}
static void sock_put_port(struct cxgbi_sock *csk)
{
struct cxgbi_device *cdev = csk->cdev;
struct cxgbi_ports_map *pmap = &cdev->pmap;
if (csk->saddr.sin_port) {
int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
csk->saddr.sin_port = 0;
if (idx < 0 || idx >= pmap->max_connect) {
pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
cdev, csk->port_id,
cdev->ports[csk->port_id]->name,
ntohs(csk->saddr.sin_port));
return;
}
spin_lock_bh(&pmap->lock);
pmap->port_csk[idx] = NULL;
pmap->used--;
spin_unlock_bh(&pmap->lock);
log_debug(1 << CXGBI_DBG_SOCK,
"cdev 0x%p, p#%u %s, release %u.\n",
cdev, csk->port_id, cdev->ports[csk->port_id]->name,
pmap->sport_base + idx);
cxgbi_sock_put(csk);
}
}
/*
* iscsi tcp connection
*/
void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
{
if (csk->cpl_close) {
kfree_skb(csk->cpl_close);
csk->cpl_close = NULL;
}
if (csk->cpl_abort_req) {
kfree_skb(csk->cpl_abort_req);
csk->cpl_abort_req = NULL;
}
if (csk->cpl_abort_rpl) {
kfree_skb(csk->cpl_abort_rpl);
csk->cpl_abort_rpl = NULL;
}
}
EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
{
struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
if (!csk) {
pr_info("alloc csk %zu failed.\n", sizeof(*csk));
return NULL;
}
if (cdev->csk_alloc_cpls(csk) < 0) {
pr_info("csk 0x%p, alloc cpls failed.\n", csk);
kfree(csk);
return NULL;
}
spin_lock_init(&csk->lock);
kref_init(&csk->refcnt);
skb_queue_head_init(&csk->receive_queue);
skb_queue_head_init(&csk->write_queue);
setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
rwlock_init(&csk->callback_lock);
csk->cdev = cdev;
csk->flags = 0;
cxgbi_sock_set_state(csk, CTP_CLOSED);
log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
return csk;
}
static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
__be16 sport, __be16 dport, u8 tos)
{
struct rtable *rt;
struct flowi fl = {
.oif = 0,
.nl_u = {
.ip4_u = {
.daddr = daddr,
.saddr = saddr,
.tos = tos }
},
.proto = IPPROTO_TCP,
.uli_u = {
.ports = {
.sport = sport,
.dport = dport }
}
};
if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
return NULL;
return rt;
}
static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
{
struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
struct dst_entry *dst;
struct net_device *ndev;
struct cxgbi_device *cdev;
struct rtable *rt = NULL;
struct cxgbi_sock *csk = NULL;
unsigned int mtu = 0;
int port = 0xFFFF;
int err = 0;
if (daddr->sin_family != AF_INET) {
pr_info("address family 0x%x NOT supported.\n",
daddr->sin_family);
err = -EAFNOSUPPORT;
goto err_out;
}
rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
if (!rt) {
pr_info("no route to ipv4 0x%x, port %u.\n",
daddr->sin_addr.s_addr, daddr->sin_port);
err = -ENETUNREACH;
goto err_out;
}
dst = &rt->dst;
ndev = dst->neighbour->dev;
if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
pr_info("multi-cast route %pI4, port %u, dev %s.\n",
&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
ndev->name);
err = -ENETUNREACH;
goto rel_rt;
}
if (ndev->flags & IFF_LOOPBACK) {
ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
mtu = ndev->mtu;
pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
dst->neighbour->dev->name, ndev->name, mtu);
}
cdev = cxgbi_device_find_by_netdev(ndev, &port);
if (!cdev) {
pr_info("dst %pI4, %s, NOT cxgbi device.\n",
&daddr->sin_addr.s_addr, ndev->name);
err = -ENETUNREACH;
goto rel_rt;
}
log_debug(1 << CXGBI_DBG_SOCK,
"route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
port, ndev->name, cdev);
csk = cxgbi_sock_create(cdev);
if (!csk) {
err = -ENOMEM;
goto rel_rt;
}
csk->cdev = cdev;
csk->port_id = port;
csk->mtu = mtu;
csk->dst = dst;
csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
csk->daddr.sin_port = daddr->sin_port;
csk->saddr.sin_addr.s_addr = rt->rt_src;
return csk;
rel_rt:
ip_rt_put(rt);
if (csk)
cxgbi_sock_closed(csk);
err_out:
return ERR_PTR(err);
}
void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
unsigned int opt)
{
csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
dst_confirm(csk->dst);
smp_mb();
cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_established);
static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
{
log_debug(1 << CXGBI_DBG_SOCK,
"csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
csk, csk->state, csk->flags, csk->user_data);
if (csk->state != CTP_ESTABLISHED) {
read_lock_bh(&csk->callback_lock);
if (csk->user_data)
iscsi_conn_failure(csk->user_data,
ISCSI_ERR_CONN_FAILED);
read_unlock_bh(&csk->callback_lock);
}
}
void cxgbi_sock_closed(struct cxgbi_sock *csk)
{
log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
csk, (csk)->state, (csk)->flags, (csk)->tid);
cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
return;
if (csk->saddr.sin_port)
sock_put_port(csk);
if (csk->dst)
dst_release(csk->dst);
csk->cdev->csk_release_offload_resources(csk);
cxgbi_sock_set_state(csk, CTP_CLOSED);
cxgbi_inform_iscsi_conn_closing(csk);
cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
static void need_active_close(struct cxgbi_sock *csk)
{
int data_lost;
int close_req = 0;
log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
csk, (csk)->state, (csk)->flags, (csk)->tid);
spin_lock_bh(&csk->lock);
dst_confirm(csk->dst);
data_lost = skb_queue_len(&csk->receive_queue);
__skb_queue_purge(&csk->receive_queue);
if (csk->state == CTP_ACTIVE_OPEN)
cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
else if (csk->state == CTP_ESTABLISHED) {
close_req = 1;
cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
} else if (csk->state == CTP_PASSIVE_CLOSE) {
close_req = 1;
cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
}
if (close_req) {
if (data_lost)
csk->cdev->csk_send_abort_req(csk);
else
csk->cdev->csk_send_close_req(csk);
}
spin_unlock_bh(&csk->lock);
}
void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
{
pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
csk, csk->state, csk->flags,
&csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
&csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
errno);
cxgbi_sock_set_state(csk, CTP_CONNECTING);
csk->err = errno;
cxgbi_sock_closed(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
{
struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
csk, (csk)->state, (csk)->flags, (csk)->tid);
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
if (csk->state == CTP_ACTIVE_OPEN)
cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
__kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
{
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
else {
cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
csk, csk->state, csk->flags, csk->tid);
cxgbi_sock_closed(csk);
}
}
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
{
log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
csk, (csk)->state, (csk)->flags, (csk)->tid);
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
goto done;
switch (csk->state) {
case CTP_ESTABLISHED:
cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
break;
case CTP_ACTIVE_CLOSE:
cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
break;
case CTP_CLOSE_WAIT_1:
cxgbi_sock_closed(csk);
break;
case CTP_ABORTING:
break;
default:
pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
csk, csk->state, csk->flags, csk->tid);
}
cxgbi_inform_iscsi_conn_closing(csk);
done:
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
{
log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
csk, (csk)->state, (csk)->flags, (csk)->tid);
cxgbi_sock_get(csk);
spin_lock_bh(&csk->lock);
csk->snd_una = snd_nxt - 1;
if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
goto done;
switch (csk->state) {
case CTP_ACTIVE_CLOSE:
cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
break;
case CTP_CLOSE_WAIT_1:
case CTP_CLOSE_WAIT_2:
cxgbi_sock_closed(csk);
break;
case CTP_ABORTING:
break;
default:
pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
csk, csk->state, csk->flags, csk->tid);
}
done:
spin_unlock_bh(&csk->lock);
cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
unsigned int snd_una, int seq_chk)
{
log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
"csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
csk, csk->state, csk->flags, csk->tid, credits,
csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
spin_lock_bh(&csk->lock);
csk->wr_cred += credits;
if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
while (credits) {
struct sk_buff *p = cxgbi_sock_peek_wr(csk);
if (unlikely(!p)) {
pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
csk, csk->state, csk->flags, csk->tid, credits,
csk->wr_cred, csk->wr_una_cred);
break;
}
if (unlikely(credits < p->csum)) {
pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
csk, csk->state, csk->flags, csk->tid,
credits, csk->wr_cred, csk->wr_una_cred,
p->csum);
p->csum -= credits;
break;
} else {
cxgbi_sock_dequeue_wr(csk);
credits -= p->csum;
kfree_skb(p);
}
}
cxgbi_sock_check_wr_invariants(csk);
if (seq_chk) {
if (unlikely(before(snd_una, csk->snd_una))) {
pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
csk, csk->state, csk->flags, csk->tid, snd_una,
csk->snd_una);
goto done;
}
if (csk->snd_una != snd_una) {
csk->snd_una = snd_una;
dst_confirm(csk->dst);
}
}
if (skb_queue_len(&csk->write_queue)) {
if (csk->cdev->csk_push_tx_frames(csk, 0))
cxgbi_conn_tx_open(csk);
} else
cxgbi_conn_tx_open(csk);
done:
spin_unlock_bh(&csk->lock);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
unsigned short mtu)
{
int i = 0;
while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
++i;
return i;
}
unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
{
unsigned int idx;
struct dst_entry *dst = csk->dst;
csk->advmss = dst_metric(dst, RTAX_ADVMSS);
if (csk->advmss > pmtu - 40)
csk->advmss = pmtu - 40;
if (csk->advmss < csk->cdev->mtus[0] - 40)
csk->advmss = csk->cdev->mtus[0] - 40;
idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
return idx;
}
EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
{
cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
__skb_queue_tail(&csk->write_queue, skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
{
struct sk_buff *skb;
while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
{
int pending = cxgbi_sock_count_pending_wrs(csk);
if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
{
struct cxgbi_device *cdev = csk->cdev;
struct sk_buff *next;
int err, copied = 0;
spin_lock_bh(&csk->lock);
if (csk->state != CTP_ESTABLISHED) {
log_debug(1 << CXGBI_DBG_PDU_TX,
"csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
csk, csk->state, csk->flags, csk->tid);
err = -EAGAIN;
goto out_err;
}
if (csk->err) {
log_debug(1 << CXGBI_DBG_PDU_TX,
"csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
csk, csk->state, csk->flags, csk->tid, csk->err);
err = -EPIPE;
goto out_err;
}
if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
log_debug(1 << CXGBI_DBG_PDU_TX,
"csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
csk, csk->state, csk->flags, csk->tid, csk->write_seq,
csk->snd_una, cdev->snd_win);
err = -ENOBUFS;
goto out_err;
}
while (skb) {
int frags = skb_shinfo(skb)->nr_frags +
(skb->len != skb->data_len);
if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
pr_err("csk 0x%p, skb head %u < %u.\n",
csk, skb_headroom(skb), cdev->skb_tx_rsvd);
err = -EINVAL;
goto out_err;
}
if (frags >= SKB_WR_LIST_SIZE) {
pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
csk, skb_shinfo(skb)->nr_frags, skb->len,
skb->data_len, (uint)(SKB_WR_LIST_SIZE));
err = -EINVAL;
goto out_err;
}
next = skb->next;
skb->next = NULL;
cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
cxgbi_sock_skb_entail(csk, skb);
copied += skb->len;
csk->write_seq += skb->len +
cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
skb = next;
}
done:
if (likely(skb_queue_len(&csk->write_queue)))
cdev->csk_push_tx_frames(csk, 1);
spin_unlock_bh(&csk->lock);
return copied;
out_err:
if (copied == 0 && err == -EPIPE)
copied = csk->err ? csk->err : -EPIPE;
else
copied = err;
goto done;
}
/*
* Direct Data Placement -
* Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
* final destination host-memory buffers based on the Initiator Task Tag (ITT)
* in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
* The host memory address is programmed into h/w in the format of pagepod
* entries.
* The location of the pagepod entry is encoded into ddp tag which is used as
* the base for ITT/TTT.
*/
static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
static unsigned char page_idx = DDP_PGIDX_MAX;
static unsigned char sw_tag_idx_bits;
static unsigned char sw_tag_age_bits;
/*
* Direct-Data Placement page size adjustment
*/
static int ddp_adjust_page_table(void)
{
int i;
unsigned int base_order, order;
if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
PAGE_SIZE, 1UL << ddp_page_shift[0]);
return -EINVAL;
}
base_order = get_order(1UL << ddp_page_shift[0]);
order = get_order(1UL << PAGE_SHIFT);
for (i = 0; i < DDP_PGIDX_MAX; i++) {
/* first is the kernel page size, then just doubling */
ddp_page_order[i] = order - base_order + i;
ddp_page_shift[i] = PAGE_SHIFT + i;
}
return 0;
}
static int ddp_find_page_index(unsigned long pgsz)
{
int i;
for (i = 0; i < DDP_PGIDX_MAX; i++) {
if (pgsz == (1UL << ddp_page_shift[i]))
return i;
}
pr_info("ddp page size %lu not supported.\n", pgsz);
return DDP_PGIDX_MAX;
}
static void ddp_setup_host_page_size(void)
{
if (page_idx == DDP_PGIDX_MAX) {
page_idx = ddp_find_page_index(PAGE_SIZE);
if (page_idx == DDP_PGIDX_MAX) {
pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
if (ddp_adjust_page_table() < 0) {
pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
return;
}
page_idx = ddp_find_page_index(PAGE_SIZE);
}
pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
}
}
void cxgbi_ddp_page_size_factor(int *pgsz_factor)
{
int i;
for (i = 0; i < DDP_PGIDX_MAX; i++)
pgsz_factor[i] = ddp_page_order[i];
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
/*
* DDP setup & teardown
*/
void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
struct cxgbi_pagepod_hdr *hdr,
struct cxgbi_gather_list *gl, unsigned int gidx)
{
int i;
memcpy(ppod, hdr, sizeof(*hdr));
for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
ppod->addr[i] = gidx < gl->nelem ?
cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
}
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
{
memset(ppod, 0, sizeof(*ppod));
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
unsigned int start, unsigned int max,
unsigned int count,
struct cxgbi_gather_list *gl)
{
unsigned int i, j, k;
/* not enough entries */
if ((max - start) < count) {
log_debug(1 << CXGBI_DBG_DDP,
"NOT enough entries %u+%u < %u.\n", start, count, max);
return -EBUSY;
}
max -= count;
spin_lock(&ddp->map_lock);
for (i = start; i < max;) {
for (j = 0, k = i; j < count; j++, k++) {
if (ddp->gl_map[k])
break;
}
if (j == count) {
for (j = 0, k = i; j < count; j++, k++)
ddp->gl_map[k] = gl;
spin_unlock(&ddp->map_lock);
return i;
}
i += j + 1;
}
spin_unlock(&ddp->map_lock);
log_debug(1 << CXGBI_DBG_DDP,
"NO suitable entries %u available.\n", count);
return -EBUSY;
}
static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
int start, int count)
{
spin_lock(&ddp->map_lock);
memset(&ddp->gl_map[start], 0,
count * sizeof(struct cxgbi_gather_list *));
spin_unlock(&ddp->map_lock);
}
static inline void ddp_gl_unmap(struct pci_dev *pdev,
struct cxgbi_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++)
dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
PCI_DMA_FROMDEVICE);
}
static inline int ddp_gl_map(struct pci_dev *pdev,
struct cxgbi_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++) {
gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
PAGE_SIZE,
PCI_DMA_FROMDEVICE);
if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
log_debug(1 << CXGBI_DBG_DDP,
"page %d 0x%p, 0x%p dma mapping err.\n",
i, gl->pages[i], pdev);
goto unmap;
}
}
return i;
unmap:
if (i) {
unsigned int nelem = gl->nelem;
gl->nelem = i;
ddp_gl_unmap(pdev, gl);
gl->nelem = nelem;
}
return -EINVAL;
}
static void ddp_release_gl(struct cxgbi_gather_list *gl,
struct pci_dev *pdev)
{
ddp_gl_unmap(pdev, gl);
kfree(gl);
}
static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
struct scatterlist *sgl,
unsigned int sgcnt,
struct pci_dev *pdev,
gfp_t gfp)
{
struct cxgbi_gather_list *gl;
struct scatterlist *sg = sgl;
struct page *sgpage = sg_page(sg);
unsigned int sglen = sg->length;
unsigned int sgoffset = sg->offset;
unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
PAGE_SHIFT;
int i = 1, j = 0;
if (xferlen < DDP_THRESHOLD) {
log_debug(1 << CXGBI_DBG_DDP,
"xfer %u < threshold %u, no ddp.\n",
xferlen, DDP_THRESHOLD);
return NULL;
}
gl = kzalloc(sizeof(struct cxgbi_gather_list) +
npages * (sizeof(dma_addr_t) +
sizeof(struct page *)), gfp);
if (!gl) {
log_debug(1 << CXGBI_DBG_DDP,
"xfer %u, %u pages, OOM.\n", xferlen, npages);
return NULL;
}
log_debug(1 << CXGBI_DBG_DDP,
"xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
gl->pages = (struct page **)&gl->phys_addr[npages];
gl->nelem = npages;
gl->length = xferlen;
gl->offset = sgoffset;
gl->pages[0] = sgpage;
for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
i++, sg = sg_next(sg)) {
struct page *page = sg_page(sg);
if (sgpage == page && sg->offset == sgoffset + sglen)
sglen += sg->length;
else {
/* make sure the sgl is fit for ddp:
* each has the same page size, and
* all of the middle pages are used completely
*/
if ((j && sgoffset) || ((i != sgcnt - 1) &&
((sglen + sgoffset) & ~PAGE_MASK))) {
log_debug(1 << CXGBI_DBG_DDP,
"page %d/%u, %u + %u.\n",
i, sgcnt, sgoffset, sglen);
goto error_out;
}
j++;
if (j == gl->nelem || sg->offset) {
log_debug(1 << CXGBI_DBG_DDP,
"page %d/%u, offset %u.\n",
j, gl->nelem, sg->offset);
goto error_out;
}
gl->pages[j] = page;
sglen = sg->length;
sgoffset = sg->offset;
sgpage = page;
}
}
gl->nelem = ++j;
if (ddp_gl_map(pdev, gl) < 0)
goto error_out;
return gl;
error_out:
kfree(gl);
return NULL;
}
static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
{
struct cxgbi_device *cdev = chba->cdev;
struct cxgbi_ddp_info *ddp = cdev->ddp;
u32 idx;
idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
if (idx < ddp->nppods) {
struct cxgbi_gather_list *gl = ddp->gl_map[idx];
unsigned int npods;
if (!gl || !gl->nelem) {
pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
tag, idx, gl, gl ? gl->nelem : 0);
return;
}
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
log_debug(1 << CXGBI_DBG_DDP,
"tag 0x%x, release idx %u, npods %u.\n",
tag, idx, npods);
cdev->csk_ddp_clear(chba, tag, idx, npods);
ddp_unmark_entries(ddp, idx, npods);
ddp_release_gl(gl, ddp->pdev);
} else
pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
}
static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
gfp_t gfp)
{
struct cxgbi_device *cdev = csk->cdev;
struct cxgbi_ddp_info *ddp = cdev->ddp;
struct cxgbi_tag_format *tformat = &cdev->tag_format;
struct cxgbi_pagepod_hdr hdr;
unsigned int npods;
int idx = -1;
int err = -ENOMEM;
u32 tag;
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
if (ddp->idx_last == ddp->nppods)
idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
npods, gl);
else {
idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
ddp->nppods, npods,
gl);
if (idx < 0 && ddp->idx_last >= npods) {
idx = ddp_find_unused_entries(ddp, 0,
min(ddp->idx_last + npods, ddp->nppods),
npods, gl);
}
}
if (idx < 0) {
log_debug(1 << CXGBI_DBG_DDP,
"xferlen %u, gl %u, npods %u NO DDP.\n",
gl->length, gl->nelem, npods);
return idx;
}
if (cdev->csk_ddp_alloc_gl_skb) {
err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp);
if (err < 0)
goto unmark_entries;
}
tag = cxgbi_ddp_tag_base(tformat, sw_tag);
tag |= idx << PPOD_IDX_SHIFT;
hdr.rsvd = 0;
hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
hdr.max_offset = htonl(gl->length);
hdr.page_offset = htonl(gl->offset);
err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
if (err < 0) {
if (cdev->csk_ddp_free_gl_skb)
cdev->csk_ddp_free_gl_skb(ddp, idx, npods);
goto unmark_entries;
}
ddp->idx_last = idx;
log_debug(1 << CXGBI_DBG_DDP,
"xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
npods);
*tagp = tag;
return 0;
unmark_entries:
ddp_unmark_entries(ddp, idx, npods);
return err;
}
int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
unsigned int sw_tag, unsigned int xferlen,
struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
{
struct cxgbi_device *cdev = csk->cdev;
struct cxgbi_tag_format *tformat = &cdev->tag_format;
struct cxgbi_gather_list *gl;
int err;
if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
xferlen < DDP_THRESHOLD) {
log_debug(1 << CXGBI_DBG_DDP,
"pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
return -EINVAL;
}
if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
log_debug(1 << CXGBI_DBG_DDP,
"sw_tag 0x%x NOT usable.\n", sw_tag);
return -EINVAL;
}
gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
if (!gl)
return -ENOMEM;
err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
if (err < 0)
ddp_release_gl(gl, cdev->pdev);
return err;
}
static void ddp_destroy(struct kref *kref)
{
struct cxgbi_ddp_info *ddp = container_of(kref,
struct cxgbi_ddp_info,
refcnt);
struct cxgbi_device *cdev = ddp->cdev;
int i = 0;
pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
while (i < ddp->nppods) {
struct cxgbi_gather_list *gl = ddp->gl_map[i];
if (gl) {
int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
>> PPOD_PAGES_SHIFT;
pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
kfree(gl);
if (cdev->csk_ddp_free_gl_skb)
cdev->csk_ddp_free_gl_skb(ddp, i, npods);
i += npods;
} else
i++;
}
cxgbi_free_big_mem(ddp);
}
int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
{
struct cxgbi_ddp_info *ddp = cdev->ddp;
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
cdev->ddp = NULL;
if (ddp)
return kref_put(&ddp->refcnt, ddp_destroy);
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
int cxgbi_ddp_init(struct cxgbi_device *cdev,
unsigned int llimit, unsigned int ulimit,
unsigned int max_txsz, unsigned int max_rxsz)
{
struct cxgbi_ddp_info *ddp;
unsigned int ppmax, bits;
ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
bits = __ilog2_u32(ppmax) + 1;
if (bits > PPOD_IDX_MAX_SIZE)
bits = PPOD_IDX_MAX_SIZE;
ppmax = (1 << (bits - 1)) - 1;
ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
ppmax * (sizeof(struct cxgbi_gather_list *) +
sizeof(struct sk_buff *)),
GFP_KERNEL);
if (!ddp) {
pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
return -ENOMEM;
}
ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
ppmax * sizeof(struct cxgbi_gather_list *));
cdev->ddp = ddp;
spin_lock_init(&ddp->map_lock);
kref_init(&ddp->refcnt);
ddp->cdev = cdev;
ddp->pdev = cdev->pdev;
ddp->llimit = llimit;
ddp->ulimit = ulimit;
ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
ddp->nppods = ppmax;
ddp->idx_last = ppmax;
ddp->idx_bits = bits;
ddp->idx_mask = (1 << bits) - 1;
ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
cdev->tag_format.rsvd_bits = ddp->idx_bits;
cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
cdev->ports[0]->name, cdev->tag_format.sw_bits,
cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
cdev->tag_format.rsvd_mask);
cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
log_debug(1 << CXGBI_DBG_DDP,
"%s max payload size: %u/%u, %u/%u.\n",
cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
cdev->rx_max_size, ddp->max_rxsz);
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
/*
* APIs interacting with open-iscsi libraries
*/
static unsigned char padding[4];
static void task_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 cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_hba *chba = cconn->chba;
struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
u32 tag = ntohl((__force u32)hdr_itt);
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
if (sc &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
cxgbi_is_ddp_tag(tformat, tag))
ddp_tag_release(chba, tag);
}
static int task_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 cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_hba *chba = cconn->chba;
struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
u32 tag = 0;
int err = -EINVAL;
if (sc &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
scsi_in(sc)->length,
scsi_in(sc)->table.sgl,
scsi_in(sc)->table.nents,
GFP_ATOMIC);
if (err < 0)
log_debug(1 << CXGBI_DBG_DDP,
"csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
cconn->cep->csk, task, scsi_in(sc)->length,
scsi_in(sc)->table.nents);
}
if (err < 0)
tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
/* the itt need to sent in big-endian order */
*hdr_itt = (__force itt_t)htonl(tag);
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
return 0;
}
void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_device *cdev = cconn->chba->cdev;
u32 tag = ntohl((__force u32) itt);
u32 sw_bits;
sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->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;
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
age ? *age : 0xFF);
}
EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
{
struct iscsi_conn *conn = csk->user_data;
if (conn) {
log_debug(1 << CXGBI_DBG_SOCK,
"csk 0x%p, cid %d.\n", csk, conn->id);
iscsi_conn_queue_work(conn);
}
}
EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
/*
* pdu receive, interact with libiscsi_tcp
*/
static inline int read_pdu_skb(struct iscsi_conn *conn,
struct sk_buff *skb,
unsigned int offset,
int offloaded)
{
int status = 0;
int bytes_read;
bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
switch (status) {
case ISCSI_TCP_CONN_ERR:
pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
skb, offset, offloaded);
return -EIO;
case ISCSI_TCP_SUSPENDED:
log_debug(1 << CXGBI_DBG_PDU_RX,
"skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
skb, offset, offloaded, bytes_read);
/* no transfer - just have caller flush queue */
return bytes_read;
case ISCSI_TCP_SKB_DONE:
pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
skb, offset, offloaded);
/*
* pdus should always fit in the skb and we should get
* segment done notifcation.
*/
iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
return -EFAULT;
case ISCSI_TCP_SEGMENT_DONE:
log_debug(1 << CXGBI_DBG_PDU_RX,
"skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
skb, offset, offloaded, bytes_read);
return bytes_read;
default:
pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
skb, offset, offloaded, status);
return -EINVAL;
}
}
static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
log_debug(1 << CXGBI_DBG_PDU_RX,
"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
conn, skb, skb->len, cxgbi_skcb_flags(skb));
if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
return -EIO;
}
if (conn->hdrdgst_en &&
cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
return -EIO;
}
return read_pdu_skb(conn, skb, 0, 0);
}
static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
struct sk_buff *skb, unsigned int offset)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
bool offloaded = 0;
int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
log_debug(1 << CXGBI_DBG_PDU_RX,
"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
conn, skb, skb->len, cxgbi_skcb_flags(skb));
if (conn->datadgst_en &&
cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
conn, lskb, cxgbi_skcb_flags(lskb));
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return -EIO;
}
if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
return 0;
/* coalesced, add header digest length */
if (lskb == skb && conn->hdrdgst_en)
offset += ISCSI_DIGEST_SIZE;
if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
offloaded = 1;
if (opcode == ISCSI_OP_SCSI_DATA_IN)
log_debug(1 << CXGBI_DBG_PDU_RX,
"skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
skb, opcode, ntohl(tcp_conn->in.hdr->itt),
tcp_conn->in.datalen, offloaded ? "is" : "not");
return read_pdu_skb(conn, skb, offset, offloaded);
}
static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
{
struct cxgbi_device *cdev = csk->cdev;
int must_send;
u32 credits;
log_debug(1 << CXGBI_DBG_PDU_RX,
"csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
csk->rcv_wup, cdev->rx_credit_thres,
cdev->rcv_win);
if (csk->state != CTP_ESTABLISHED)
return;
credits = csk->copied_seq - csk->rcv_wup;
if (unlikely(!credits))
return;
if (unlikely(cdev->rx_credit_thres == 0))
return;
must_send = credits + 16384 >= cdev->rcv_win;
if (must_send || credits >= cdev->rx_credit_thres)
csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
}
void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
{
struct cxgbi_device *cdev = csk->cdev;
struct iscsi_conn *conn = csk->user_data;
struct sk_buff *skb;
unsigned int read = 0;
int err = 0;
log_debug(1 << CXGBI_DBG_PDU_RX,
"csk 0x%p, conn 0x%p.\n", csk, conn);
if (unlikely(!conn || conn->suspend_rx)) {
log_debug(1 << CXGBI_DBG_PDU_RX,
"csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
csk, conn, conn ? conn->id : 0xFF,
conn ? conn->suspend_rx : 0xFF);
return;
}
while (!err) {
skb = skb_peek(&csk->receive_queue);
if (!skb ||
!(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
if (skb)
log_debug(1 << CXGBI_DBG_PDU_RX,
"skb 0x%p, NOT ready 0x%lx.\n",
skb, cxgbi_skcb_flags(skb));
break;
}
__skb_unlink(skb, &csk->receive_queue);
read += cxgbi_skcb_rx_pdulen(skb);
log_debug(1 << CXGBI_DBG_PDU_RX,
"csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
csk, skb, skb->len, cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb));
if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
err = skb_read_pdu_bhs(conn, skb);
if (err < 0) {
pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
"f 0x%lx, plen %u.\n",
csk, skb, skb->len,
cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb));
goto skb_done;
}
err = skb_read_pdu_data(conn, skb, skb,
err + cdev->skb_rx_extra);
if (err < 0)
pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
"f 0x%lx, plen %u.\n",
csk, skb, skb->len,
cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb));
} else {
err = skb_read_pdu_bhs(conn, skb);
if (err < 0) {
pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
"f 0x%lx, plen %u.\n",
csk, skb, skb->len,
cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb));
goto skb_done;
}
if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
struct sk_buff *dskb;
dskb = skb_peek(&csk->receive_queue);
if (!dskb) {
pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
" plen %u, NO data.\n",
csk, skb, skb->len,
cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb));
err = -EIO;
goto skb_done;
}
__skb_unlink(dskb, &csk->receive_queue);
err = skb_read_pdu_data(conn, skb, dskb, 0);
if (err < 0)
pr_err("data, csk 0x%p, skb 0x%p,%u, "
"f 0x%lx, plen %u, dskb 0x%p,"
"%u.\n",
csk, skb, skb->len,
cxgbi_skcb_flags(skb),
cxgbi_skcb_rx_pdulen(skb),
dskb, dskb->len);
__kfree_skb(dskb);
} else
err = skb_read_pdu_data(conn, skb, skb, 0);
}
skb_done:
__kfree_skb(skb);
if (err < 0)
break;
}
log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
if (read) {
csk->copied_seq += read;
csk_return_rx_credits(csk, read);
conn->rxdata_octets += read;
}
if (err < 0) {
pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
csk, conn, err, read);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
}
EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
unsigned int offset, unsigned int *off,
struct scatterlist **sgp)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, sgcnt, i) {
if (offset < sg->length) {
*off = offset;
*sgp = sg;
return 0;
}
offset -= sg->length;
}
return -EFAULT;
}
static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
unsigned int dlen, skb_frag_t *frags,
int frag_max)
{
unsigned int datalen = dlen;
unsigned int sglen = sg->length - sgoffset;
struct page *page = sg_page(sg);
int i;
i = 0;
do {
unsigned int copy;
if (!sglen) {
sg = sg_next(sg);
if (!sg) {
pr_warn("sg %d NULL, len %u/%u.\n",
i, datalen, dlen);
return -EINVAL;
}
sgoffset = 0;
sglen = sg->length;
page = sg_page(sg);
}
copy = min(datalen, sglen);
if (i && page == frags[i - 1].page &&
sgoffset + sg->offset ==
frags[i - 1].page_offset + frags[i - 1].size) {
frags[i - 1].size += copy;
} else {
if (i >= frag_max) {
pr_warn("too many pages %u, dlen %u.\n",
frag_max, dlen);
return -EINVAL;
}
frags[i].page = page;
frags[i].page_offset = sg->offset + sgoffset;
frags[i].size = copy;
i++;
}
datalen -= copy;
sgoffset += copy;
sglen -= copy;
} while (datalen);
return i;
}
int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
{
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
struct cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_device *cdev = cconn->chba->cdev;
struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct scsi_cmnd *sc = task->sc;
int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
tcp_task->dd_data = tdata;
task->hdr = NULL;
if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
(opcode == ISCSI_OP_SCSI_DATA_OUT ||
(opcode == ISCSI_OP_SCSI_CMD &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
/* data could goes into skb head */
headroom += min_t(unsigned int,
SKB_MAX_HEAD(cdev->skb_tx_rsvd),
conn->max_xmit_dlength);
tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
if (!tdata->skb) {
pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
cdev->skb_tx_rsvd, headroom, opcode);
return -ENOMEM;
}
skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
task->hdr = (struct iscsi_hdr *)tdata->skb->data;
task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
/* data_out uses scsi_cmd's itt */
if (opcode != ISCSI_OP_SCSI_DATA_OUT)
task_reserve_itt(task, &task->hdr->itt);
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
"task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
conn->max_xmit_dlength, ntohl(task->hdr->itt));
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
{
u8 submode = 0;
if (hcrc)
submode |= 1;
if (dcrc)
submode |= 2;
cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
}
int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
unsigned int count)
{
struct iscsi_conn *conn = task->conn;
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct sk_buff *skb = tdata->skb;
unsigned int datalen = count;
int i, padlen = iscsi_padding(count);
struct page *pg;
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
"task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
skb_put(skb, task->hdr_len);
tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
if (!count)
return 0;
if (task->sc) {
struct scsi_data_buffer *sdb = scsi_out(task->sc);
struct scatterlist *sg = NULL;
int err;
tdata->offset = offset;
tdata->count = count;
err = sgl_seek_offset(
sdb->table.sgl, sdb->table.nents,
tdata->offset, &tdata->sgoffset, &sg);
if (err < 0) {
pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
sdb->table.nents, tdata->offset, sdb->length);
return err;
}
err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
tdata->frags, MAX_PDU_FRAGS);
if (err < 0) {
pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
sdb->table.nents, tdata->offset, tdata->count);
return err;
}
tdata->nr_frags = err;
if (tdata->nr_frags > MAX_SKB_FRAGS ||
(padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
char *dst = skb->data + task->hdr_len;
skb_frag_t *frag = tdata->frags;
/* data fits in the skb's headroom */
for (i = 0; i < tdata->nr_frags; i++, frag++) {
char *src = kmap_atomic(frag->page,
KM_SOFTIRQ0);
memcpy(dst, src+frag->page_offset, frag->size);
dst += frag->size;
kunmap_atomic(src, KM_SOFTIRQ0);
}
if (padlen) {
memset(dst, 0, padlen);
padlen = 0;
}
skb_put(skb, count + padlen);
} else {
/* data fit into frag_list */
for (i = 0; i < tdata->nr_frags; i++)
get_page(tdata->frags[i].page);
memcpy(skb_shinfo(skb)->frags, tdata->frags,
sizeof(skb_frag_t) * tdata->nr_frags);
skb_shinfo(skb)->nr_frags = tdata->nr_frags;
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
} else {
pg = virt_to_page(task->data);
get_page(pg);
skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
count);
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
if (padlen) {
i = skb_shinfo(skb)->nr_frags;
skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
virt_to_page(padding), offset_in_page(padding),
padlen);
skb->data_len += padlen;
skb->truesize += padlen;
skb->len += padlen;
}
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
{
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
struct cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct sk_buff *skb = tdata->skb;
unsigned int datalen;
int err;
if (!skb) {
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
"task 0x%p, skb NULL.\n", task);
return 0;
}
datalen = skb->data_len;
tdata->skb = NULL;
err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
if (err > 0) {
int pdulen = err;
log_debug(1 << CXGBI_DBG_PDU_TX,
"task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
task, task->sc, skb, skb->len, skb->data_len, err);
if (task->conn->hdrdgst_en)
pdulen += ISCSI_DIGEST_SIZE;
if (datalen && task->conn->datadgst_en)
pdulen += ISCSI_DIGEST_SIZE;
task->conn->txdata_octets += pdulen;
return 0;
}
if (err == -EAGAIN || err == -ENOBUFS) {
log_debug(1 << CXGBI_DBG_PDU_TX,
"task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
task, skb, skb->len, skb->data_len, err);
/* reset skb to send when we are called again */
tdata->skb = skb;
return err;
}
kfree_skb(skb);
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
"itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
task->itt, skb, skb->len, skb->data_len, err);
iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
return err;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
void cxgbi_cleanup_task(struct iscsi_task *task)
{
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
log_debug(1 << CXGBI_DBG_ISCSI,
"task 0x%p, skb 0x%p, itt 0x%x.\n",
task, tdata->skb, task->hdr_itt);
/* never reached the xmit task callout */
if (tdata->skb)
__kfree_skb(tdata->skb);
memset(tdata, 0, sizeof(*tdata));
task_release_itt(task, task->hdr_itt);
iscsi_tcp_cleanup_task(task);
}
EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
void cxgbi_get_conn_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;
}
EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_device *cdev = cconn->chba->cdev;
unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
unsigned int max_def = 512 * MAX_SKB_FRAGS;
unsigned int max = max(max_def, headroom);
max = min(cconn->chba->cdev->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;
cxgbi_align_pdu_size(conn->max_xmit_dlength);
return 0;
}
static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgbi_conn *cconn = tcp_conn->dd_data;
unsigned int max = cconn->chba->cdev->rx_max_size;
cxgbi_align_pdu_size(max);
if (conn->max_recv_dlength) {
if (conn->max_recv_dlength > max) {
pr_err("MaxRecvDataSegmentLength %u > %u.\n",
conn->max_recv_dlength, max);
return -EINVAL;
}
conn->max_recv_dlength = min(conn->max_recv_dlength, max);
cxgbi_align_pdu_size(conn->max_recv_dlength);
} else
conn->max_recv_dlength = max;
return 0;
}
int cxgbi_set_conn_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 cxgbi_conn *cconn = tcp_conn->dd_data;
struct cxgbi_sock *csk = cconn->cep->csk;
int value, err = 0;
log_debug(1 << CXGBI_DBG_ISCSI,
"cls_conn 0x%p, param %d, buf(%d) %s.\n",
cls_conn, param, buflen, buf);
switch (param) {
case ISCSI_PARAM_HDRDGST_EN:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err && conn->hdrdgst_en)
err = csk->cdev->csk_ddp_setup_digest(csk, csk->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 = csk->cdev->csk_ddp_setup_digest(csk, csk->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 = cxgbi_conn_max_recv_dlength(conn);
break;
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
err = iscsi_set_param(cls_conn, param, buf, buflen);
if (!err)
err = cxgbi_conn_max_xmit_dlength(conn);
break;
default:
return iscsi_set_param(cls_conn, param, buf, buflen);
}
return err;
}
EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf)
{
struct iscsi_conn *iconn = cls_conn->dd_data;
int len;
log_debug(1 << CXGBI_DBG_ISCSI,
"cls_conn 0x%p, param %d.\n", cls_conn, param);
switch (param) {
case ISCSI_PARAM_CONN_PORT:
spin_lock_bh(&iconn->session->lock);
len = sprintf(buf, "%hu\n", iconn->portal_port);
spin_unlock_bh(&iconn->session->lock);
break;
case ISCSI_PARAM_CONN_ADDRESS:
spin_lock_bh(&iconn->session->lock);
len = sprintf(buf, "%s\n", iconn->portal_address);
spin_unlock_bh(&iconn->session->lock);
break;
default:
return iscsi_conn_get_param(cls_conn, param, buf);
}
return len;
}
EXPORT_SYMBOL_GPL(cxgbi_get_conn_param);
struct iscsi_cls_conn *
cxgbi_create_conn(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 cxgbi_conn *cconn;
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->iconn = conn;
log_debug(1 << CXGBI_DBG_ISCSI,
"cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
return cls_conn;
}
EXPORT_SYMBOL_GPL(cxgbi_create_conn);
int cxgbi_bind_conn(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 cxgbi_conn *cconn = tcp_conn->dd_data;
struct iscsi_endpoint *ep;
struct cxgbi_endpoint *cep;
struct cxgbi_sock *csk;
int err;
ep = iscsi_lookup_endpoint(transport_eph);
if (!ep)
return -EINVAL;
/* setup ddp pagesize */
cep = ep->dd_data;
csk = cep->csk;
err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
if (err < 0)
return err;
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;
write_lock_bh(&csk->callback_lock);
csk->user_data = conn;
cconn->chba = cep->chba;
cconn->cep = cep;
cep->cconn = cconn;
write_unlock_bh(&csk->callback_lock);
cxgbi_conn_max_xmit_dlength(conn);
cxgbi_conn_max_recv_dlength(conn);
spin_lock_bh(&conn->session->lock);
sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr);
conn->portal_port = ntohs(csk->daddr.sin_port);
spin_unlock_bh(&conn->session->lock);
log_debug(1 << CXGBI_DBG_ISCSI,
"cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
cls_session, cls_conn, ep, cconn, csk);
/* init recv engine */
iscsi_tcp_hdr_recv_prep(tcp_conn);
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
u16 cmds_max, u16 qdepth,
u32 initial_cmdsn)
{
struct cxgbi_endpoint *cep;
struct cxgbi_hba *chba;
struct Scsi_Host *shost;
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
if (!ep) {
pr_err("missing endpoint.\n");
return NULL;
}
cep = ep->dd_data;
chba = cep->chba;
shost = chba->shost;
BUG_ON(chba != iscsi_host_priv(shost));
cls_session = iscsi_session_setup(chba->cdev->itp, shost,
cmds_max, 0,
sizeof(struct iscsi_tcp_task) +
sizeof(struct cxgbi_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;
log_debug(1 << CXGBI_DBG_ISCSI,
"ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
return cls_session;
remove_session:
iscsi_session_teardown(cls_session);
return NULL;
}
EXPORT_SYMBOL_GPL(cxgbi_create_session);
void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
{
log_debug(1 << CXGBI_DBG_ISCSI,
"cls sess 0x%p.\n", cls_session);
iscsi_tcp_r2tpool_free(cls_session->dd_data);
iscsi_session_teardown(cls_session);
}
EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
char *buf, int buflen)
{
struct cxgbi_hba *chba = iscsi_host_priv(shost);
if (!chba->ndev) {
shost_printk(KERN_ERR, shost, "Could not get host param. "
"netdev for host not set.\n");
return -ENODEV;
}
log_debug(1 << CXGBI_DBG_ISCSI,
"shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
shost, chba, chba->ndev->name, param, buflen, buf);
switch (param) {
case ISCSI_HOST_PARAM_IPADDRESS:
{
__be32 addr = in_aton(buf);
log_debug(1 << CXGBI_DBG_ISCSI,
"hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
cxgbi_set_iscsi_ipv4(chba, addr);
return 0;
}
case ISCSI_HOST_PARAM_HWADDRESS:
case ISCSI_HOST_PARAM_NETDEV_NAME:
return 0;
default:
return iscsi_host_set_param(shost, param, buf, buflen);
}
}
EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
char *buf)
{
struct cxgbi_hba *chba = iscsi_host_priv(shost);
int len = 0;
if (!chba->ndev) {
shost_printk(KERN_ERR, shost, "Could not get host param. "
"netdev for host not set.\n");
return -ENODEV;
}
log_debug(1 << CXGBI_DBG_ISCSI,
"shost 0x%p, hba 0x%p,%s, param %d.\n",
shost, chba, chba->ndev->name, param);
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
break;
case ISCSI_HOST_PARAM_NETDEV_NAME:
len = sprintf(buf, "%s\n", chba->ndev->name);
break;
case ISCSI_HOST_PARAM_IPADDRESS:
{
__be32 addr;
addr = cxgbi_get_iscsi_ipv4(chba);
len = sprintf(buf, "%pI4", &addr);
log_debug(1 << CXGBI_DBG_ISCSI,
"hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
break;
}
default:
return iscsi_host_get_param(shost, param, buf);
}
return len;
}
EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
struct sockaddr *dst_addr,
int non_blocking)
{
struct iscsi_endpoint *ep;
struct cxgbi_endpoint *cep;
struct cxgbi_hba *hba = NULL;
struct cxgbi_sock *csk;
int err = -EINVAL;
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
"shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
shost, non_blocking, dst_addr);
if (shost) {
hba = iscsi_host_priv(shost);
if (!hba) {
pr_info("shost 0x%p, priv NULL.\n", shost);
goto err_out;
}
}
csk = cxgbi_check_route(dst_addr);
if (IS_ERR(csk))
return (struct iscsi_endpoint *)csk;
cxgbi_sock_get(csk);
if (!hba)
hba = csk->cdev->hbas[csk->port_id];
else if (hba != csk->cdev->hbas[csk->port_id]) {
pr_info("Could not connect through requested host %u"
"hba 0x%p != 0x%p (%u).\n",
shost->host_no, hba,
csk->cdev->hbas[csk->port_id], csk->port_id);
err = -ENOSPC;
goto release_conn;
}
err = sock_get_port(csk);
if (err)
goto release_conn;
cxgbi_sock_set_state(csk, CTP_CONNECTING);
err = csk->cdev->csk_init_act_open(csk);
if (err)
goto release_conn;
if (cxgbi_sock_is_closing(csk)) {
err = -ENOSPC;
pr_info("csk 0x%p is closing.\n", csk);
goto release_conn;
}
ep = iscsi_create_endpoint(sizeof(*cep));
if (!ep) {
err = -ENOMEM;
pr_info("iscsi alloc ep, OOM.\n");
goto release_conn;
}
cep = ep->dd_data;
cep->csk = csk;
cep->chba = hba;
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
"ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
ep, cep, csk, hba, hba->ndev->name);
return ep;
release_conn:
cxgbi_sock_put(csk);
cxgbi_sock_closed(csk);
err_out:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
{
struct cxgbi_endpoint *cep = ep->dd_data;
struct cxgbi_sock *csk = cep->csk;
if (!cxgbi_sock_is_established(csk))
return 0;
return 1;
}
EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
{
struct cxgbi_endpoint *cep = ep->dd_data;
struct cxgbi_conn *cconn = cep->cconn;
struct cxgbi_sock *csk = cep->csk;
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
"ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
ep, cep, cconn, csk, csk->state, csk->flags);
if (cconn && cconn->iconn) {
iscsi_suspend_tx(cconn->iconn);
write_lock_bh(&csk->callback_lock);
cep->csk->user_data = NULL;
cconn->cep = NULL;
write_unlock_bh(&csk->callback_lock);
}
iscsi_destroy_endpoint(ep);
if (likely(csk->state >= CTP_ESTABLISHED))
need_active_close(csk);
else
cxgbi_sock_closed(csk);
cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
int cxgbi_iscsi_init(struct iscsi_transport *itp,
struct scsi_transport_template **stt)
{
*stt = iscsi_register_transport(itp);
if (*stt == NULL) {
pr_err("unable to register %s transport 0x%p.\n",
itp->name, itp);
return -ENODEV;
}
log_debug(1 << CXGBI_DBG_ISCSI,
"%s, registered iscsi transport 0x%p.\n",
itp->name, stt);
return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
struct scsi_transport_template **stt)
{
if (*stt) {
log_debug(1 << CXGBI_DBG_ISCSI,
"de-register transport 0x%p, %s, stt 0x%p.\n",
itp, itp->name, *stt);
*stt = NULL;
iscsi_unregister_transport(itp);
}
}
EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
static int __init libcxgbi_init_module(void)
{
sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
pr_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);
ddp_setup_host_page_size();
return 0;
}
static void __exit libcxgbi_exit_module(void)
{
cxgbi_device_unregister_all(0xFF);
return;
}
module_init(libcxgbi_init_module);
module_exit(libcxgbi_exit_module);
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