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target.c
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target.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019, 2020 Vitaly Mayatskikh <[email protected]>
*
* This work is licensed under the terms of the GNU GPL, version 2.
*
*/
#include <linux/blk-mq.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/xarray.h>
#include "ethblk.h"
#include "network.h"
#include "target.h"
#include "worker.h"
static bool target_running = false;
static struct ethblk_worker_pool *workers;
#define NET_STAT_ADD(i, var, val) \
do { \
if (i) { \
if (i->d->net_stat_enabled) { \
struct ethblk_target_disk_net_stat *dstat = \
get_cpu_ptr(i->d->stat); \
dstat->_##var += val; \
if (i->net_stat_enabled) { \
struct ethblk_target_disk_net_stat \
*is = this_cpu_ptr(i->stat); \
is->_##var += val; \
} \
put_cpu_ptr(i->d->stat); \
} \
} \
} while (0)
#define NET_STAT_INC(i, var) NET_STAT_ADD(i, var, 1)
#define NET_STAT_GET(struc, var) \
({ \
int cpu; \
unsigned long long acc = 0; \
for_each_possible_cpu (cpu) { \
acc += (per_cpu_ptr(struc, cpu))->_##var; \
} \
acc; \
})
static struct kmem_cache *ethblk_target_cmd_cache = NULL;
static DEFINE_XARRAY(ethblk_target_disks);
static void ethblk_target_initiator_free_deferred(struct work_struct *w);
static void ethblk_target_disk_delete_initiator(struct ethblk_target_disk_ini *ini);
static void ethblk_target_disk_free_deferred(struct work_struct *w);
static void ethblk_target_ini_free(struct percpu_ref *ref);
static struct ethblk_target_disk *ethblk_target_find_disk(unsigned short drv_id);
static void ethblk_target_disk_free(struct percpu_ref *ref);
static inline void ethblk_target_get_disk(struct ethblk_target_disk *d)
{
percpu_ref_get(&d->ref);
}
static inline void ethblk_target_put_disk(struct ethblk_target_disk *d)
{
percpu_ref_put(&d->ref);
}
static inline void ethblk_target_get_ini(struct ethblk_target_disk_ini *ini)
{
percpu_ref_get(&ini->ref);
}
static inline void ethblk_target_put_ini(struct ethblk_target_disk_ini *ini)
{
percpu_ref_put(&ini->ref);
}
static int ethblk_target_disk_net_stat_init(
struct ethblk_target_disk_net_stat __percpu **stat)
{
struct ethblk_target_disk_net_stat *st;
unsigned int i;
*stat = alloc_percpu(struct ethblk_target_disk_net_stat);
if (!*stat) {
dprintk(err, "can't alloc disk stat\n");
return -ENOMEM;
}
for_each_possible_cpu (i) {
st = per_cpu_ptr(*stat, i);
memset(st, 0, sizeof(struct ethblk_target_disk_net_stat));
}
return 0;
}
static void ethblk_target_unregister_netdevice(struct net_device *nd)
{
struct ethblk_target_disk *d;
struct ethblk_target_disk_ini *ini;
unsigned long drv_id;
/* FIXME rtnl_lock held, we are in atomic context. Oh well... */
dprintk(info, "nd %px name %s\n", nd, nd->name);
rcu_read_lock();
xa_for_each(ðblk_target_disks, drv_id, d) {
list_for_each_entry_rcu (ini, &d->initiators, list) {
if (nd == ini->nd) {
ethblk_target_disk_delete_initiator(ini);
}
}
}
rcu_read_unlock();
}
static struct ethblk_target_disk_ini *
ethblk_target_disk_initiator_find(struct ethblk_target_disk *d,
const char *mac, struct net_device *nd)
{
struct ethblk_target_disk_ini *ini;
rcu_read_lock();
list_for_each_entry_rcu (ini, &d->initiators, list) {
/* FIXME xarray, too? */
if ((nd == ini->nd) && ether_addr_equal(mac, ini->mac)) {
ethblk_target_get_ini(ini);
goto out;
}
}
ini = NULL;
out:
rcu_read_unlock();
return ini;
}
static int ethblk_target_disk_access_check(struct ethblk_target_disk *d,
const unsigned char *mac,
struct net_device *nd)
{
struct ethblk_target_disk_ini *ini;
ini = ethblk_target_disk_initiator_find(d, mac, nd);
if (ini)
ethblk_target_put_ini(ini);
return !!ini;
}
static struct kobject ethblk_sysfs_target_kobj;
static int ethblk_target_disk_net_stat_dump(
char *buf, int len, struct ethblk_target_disk_net_stat __percpu *stat)
{
return snprintf(buf, len,
"rx-count %llu\ntx-count %llu\nrx-bytes %llu\n"
"tx-bytes %llu\nrx-dropped %llu\ntx-dropped %llu\n"
"err-count %llu\n",
NET_STAT_GET(stat, cnt.rx_count),
NET_STAT_GET(stat, cnt.tx_count),
NET_STAT_GET(stat, cnt.rx_bytes),
NET_STAT_GET(stat, cnt.tx_bytes),
NET_STAT_GET(stat, cnt.rx_dropped),
NET_STAT_GET(stat, cnt.tx_dropped),
NET_STAT_GET(stat, cnt.err_count));
}
static ssize_t ethblk_target_disk_ini_stat_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
struct ethblk_target_disk_ini *ini =
container_of(kobj, struct ethblk_target_disk_ini, kobj);
ssize_t ret;
ret = ethblk_target_disk_net_stat_dump(buf, PAGE_SIZE, ini->stat);
return min_t(ssize_t, (ssize_t)PAGE_SIZE, ret);
}
static struct kobj_attribute ethblk_target_disk_ini_stat_attr =
__ATTR(stat, 0440, ethblk_target_disk_ini_stat_show, NULL);
static struct attribute *ethblk_target_disk_ini_attrs[] = {
ðblk_target_disk_ini_stat_attr.attr, NULL
};
static struct attribute_group ethblk_target_disk_ini_group = {
.attrs = ethblk_target_disk_ini_attrs,
};
static struct kobj_type ethblk_target_disk_ini_kobj_type = {
.sysfs_ops = &kobj_sysfs_ops,
};
static void ethblk_target_announce(struct ethblk_target_disk_ini *ini)
{
struct ethblk_hdr *req_hdr;
struct sk_buff *skb;
int hdr_size = sizeof(struct ethblk_hdr);
rcu_read_lock();
dev_hold(ini->nd);
skb = ethblk_network_new_skb(hdr_size);
if (skb == NULL) {
dprintk(err, "skb alloc failure\n");
goto err;
}
skb_put(skb, hdr_size);
skb->dev = ini->nd;
req_hdr = (struct ethblk_hdr *)skb_mac_header(skb);
memset(req_hdr, 0, hdr_size);
eth_broadcast_addr(req_hdr->dst);
ether_addr_copy(req_hdr->src, ini->nd->dev_addr);
req_hdr->type = cpu_to_be16(eth_p_type);
ETHBLK_HDR_SET_FLAGS(req_hdr, ETHBLK_PROTO_VERSION, 0, 0);
req_hdr->drv_id = cpu_to_be16(ini->d->drv_id);
req_hdr->op = ETHBLK_OP_CFG_CHANGE;
ethblk_network_xmit_skb(skb);
err:
dev_put(ini->nd);
rcu_read_unlock();
}
static int ethblk_target_disk_add_initiator(struct ethblk_target_disk *d,
unsigned char *mac, char *iface)
{
struct ethblk_target_disk_ini *ini;
struct net_device *nd;
int ret;
nd = dev_get_by_name(&init_net, iface);
if (!nd) {
dprintk(err, "no network interface %s\n", iface);
ret = -EINVAL;
goto err;
}
if (ether_addr_equal(mac, nd->dev_addr)) {
dprintk(err, "target can't be initiator to self\n");
ret = -EINVAL;
goto err_free_netdev;
}
ini = kzalloc(sizeof(struct ethblk_target_disk_ini), GFP_KERNEL);
if (!ini) {
dprintk(err, "can't allocate memory for new initiator\n");
ret = -ENOMEM;
goto err_free_netdev;
}
ret = ethblk_target_disk_net_stat_init(&ini->stat);
if (ret != 0) {
dprintk(err, "can't allocate stat memory for new initiator\n");
goto err_free_ini;
}
snprintf(ini->name, sizeof(ini->name),
"%s_%02x:%02x:%02x:%02x:%02x:%02x", iface, mac[0], mac[1],
mac[2], mac[3], mac[4], mac[5]);
dprintk(debug, "disk %s creating initiator %s %px\n", d->name, ini->name,
ini);
ini->d = d;
ini->nd = nd;
ini->net_stat_enabled = d->net_stat_enabled;
ether_addr_copy(ini->mac, mac);
ini->ip = ethblk_network_if_get_saddr(ini->nd);
INIT_LIST_HEAD(&ini->list);
INIT_WORK(&ini->free_work, ethblk_target_initiator_free_deferred);
if (ethblk_target_disk_access_check(d, ini->mac, nd)) {
dprintk(err, "disk %s initiator %s already exists\n", d->name,
ini->name);
ret = -EEXIST;
goto err_free_ini;
}
ret = percpu_ref_init(&ini->ref, ethblk_target_ini_free, 0, GFP_KERNEL);
if (ret) {
dprintk(err, "cannot init percpu_ref\n");
goto err_free_ini;
}
mutex_lock(&d->initiator_lock);
ret = kobject_init_and_add(&ini->kobj,
ðblk_target_disk_ini_kobj_type,
&d->inis_kobj, ini->name);
if (ret) {
mutex_unlock(&d->initiator_lock);
dprintk(err, "disk %s ini %s can't add kobject: %d\n", d->name,
ini->name, ret);
goto err_free_ref;
}
ret = sysfs_create_group(&ini->kobj, ðblk_target_disk_ini_group);
if (ret) {
mutex_unlock(&d->initiator_lock);
dprintk(err, "disk %s ini %s can't create sysfs: %d\n", d->name,
ini->name, ret);
goto err_free_kobject;
}
ethblk_target_get_disk(ini->d);
list_add_tail_rcu(&ini->list, &d->initiators);
mutex_unlock(&d->initiator_lock);
synchronize_rcu();
dprintk(info, "disk %s added new initiator %s\n", d->name, ini->name);
ethblk_target_announce(ini);
return 0;
err_free_kobject:
kobject_del(&ini->kobj);
err_free_ref:
percpu_ref_exit(&ini->ref);
err_free_ini:
if (ini->stat)
free_percpu(ini->stat);
kfree(ini);
err_free_netdev:
dev_put(nd);
err:
return ret;
}
static void ethblk_target_initiator_free_deferred(struct work_struct *w)
{
struct ethblk_target_disk_ini *ini =
container_of(w, struct ethblk_target_disk_ini, free_work);
dprintk(info, "disk %s freeing ini %s %px\n", ini->d->name, ini->name, ini);
dev_put(ini->nd);
sysfs_remove_group(&ini->kobj, ðblk_target_disk_ini_group);
kobject_del(&ini->kobj);
ethblk_target_put_disk(ini->d);
free_percpu(ini->stat);
percpu_ref_exit(&ini->ref);
kfree_rcu(ini, rcu);
}
static void ethblk_target_ini_free(struct percpu_ref *ref)
{
struct ethblk_target_disk_ini *ini =
container_of(ref, struct ethblk_target_disk_ini, ref);
dprintk(info, "disk %s ini %s %px schedule freeing\n",
ini->d->name, ini->name, ini);
schedule_work(&ini->free_work);
}
static void
ethblk_target_disk_delete_initiator(struct ethblk_target_disk_ini *ini)
{
dprintk(info, "disk %s deleting initiator %s\n", ini->d->name,
ini->name);
list_del_rcu(&ini->list);
percpu_ref_kill(&ini->ref);
dprintk(info, "disk %s initiator %s deleted\n", ini->d->name,
ini->name);
}
static int
ethblk_target_disk_find_and_delete_initiator(struct ethblk_target_disk *d,
unsigned char *mac, char *iface)
{
struct ethblk_target_disk_ini *ini;
struct net_device *nd;
int ret;
char s[ETH_ALEN * 3 + IFNAMSIZ + 1];
snprintf(s, sizeof(s), "%s_%pM", iface, mac);
dprintk(debug, "disk %s deleting initiator %s\n", d->name, s);
nd = dev_get_by_name(&init_net, iface);
if (!nd) {
dprintk(err, "no network interface %s\n", iface);
ret = -ENOENT;
goto err;
}
ini = ethblk_target_disk_initiator_find(d, mac, nd);
if (!ini) {
dprintk(info, "disk %s initiator %s_%pM was not found\n",
d->name, nd->name, mac);
ret = -ENOENT;
goto err_nd;
}
mutex_lock(&d->initiator_lock);
ethblk_target_disk_delete_initiator(ini);
mutex_unlock(&d->initiator_lock);
ethblk_target_put_ini(ini);
ret = 0;
err_nd:
dev_put(nd);
err:
return ret;
}
static void ethblk_target_disk_inis_free(struct ethblk_target_disk *d)
{
struct ethblk_target_disk_ini *ini;
mutex_lock(&d->initiator_lock);
dprintk(info, "disk %s deleting initiators\n", d->name);
list_for_each_entry_rcu (ini, &d->initiators, list) {
dprintk(info, "disk %s deleting initiator %s\n", d->name,
ini->name);
ethblk_target_disk_delete_initiator(ini);
}
mutex_unlock(&d->initiator_lock);
}
static ssize_t ethblk_target_disk_backend_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
struct ethblk_target_disk *d =
container_of(kobj, struct ethblk_target_disk, kobj);
return snprintf(buf, PAGE_SIZE, "%s\n", d->backend_path);
}
static void ethblk_target_destroy_disk_deferred(struct work_struct *w)
{
struct ethblk_target_disk *d =
container_of(w, struct ethblk_target_disk, destroy_work);
dprintk(info, "disk %s\n", d->name);
percpu_ref_kill(&d->ref);
ethblk_target_disk_inis_free(d);
}
static ssize_t ethblk_target_disk_destroy_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct ethblk_target_disk *d =
container_of(kobj, struct ethblk_target_disk, kobj);
dprintk(info, "destroying disk %s %px\n", d->name, d);
schedule_work(&d->destroy_work);
return count;
}
static ssize_t ethblk_target_disk_net_stat_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
struct ethblk_target_disk *d =
container_of(kobj, struct ethblk_target_disk, kobj);
ssize_t ret;
ret = ethblk_target_disk_net_stat_dump(buf, PAGE_SIZE, d->stat);
return min_t(ssize_t, PAGE_SIZE, ret);
}
static struct kobj_attribute ethblk_target_disk_backend_attr =
__ATTR(backend, 0440, ethblk_target_disk_backend_show, NULL);
static struct kobj_attribute ethblk_target_disk_destroy_attr =
__ATTR(destroy, 0220, NULL, ethblk_target_disk_destroy_store);
static struct kobj_attribute ethblk_target_disk_net_stat_attr =
__ATTR(stat, 0440, ethblk_target_disk_net_stat_show, NULL);
static struct attribute *ethblk_target_disk_attrs[] = {
ðblk_target_disk_backend_attr.attr,
ðblk_target_disk_destroy_attr.attr,
ðblk_target_disk_net_stat_attr.attr, NULL
};
static struct attribute_group ethblk_target_disk_group = {
.attrs = ethblk_target_disk_attrs,
};
static struct kobj_type ethblk_target_disk_kobj_type = {
.sysfs_ops = &kobj_sysfs_ops,
};
static ssize_t ethblk_target_disk_ini_add_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct ethblk_target_disk *d =
container_of(kobj, struct ethblk_target_disk, inis_kobj);
unsigned char mac[ETH_ALEN];
char iface[IFNAMSIZ];
int ret;
ret = sscanf(buf, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx %s",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5],
iface);
if (ret != 7) {
dprintk(err, "can't parse (%d): %s\n", ret, buf);
return -EINVAL;
}
ret = ethblk_target_disk_add_initiator(d, mac, iface);
if (ret) {
dprintk(debug, "disk %s can't add initiator %pM/%s\n", d->name,
mac, iface);
count = ret;
}
return count;
}
static ssize_t ethblk_target_disk_ini_delete_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf,
size_t count)
{
struct ethblk_target_disk *d =
container_of(kobj, struct ethblk_target_disk, inis_kobj);
unsigned char mac[ETH_ALEN];
char iface[IFNAMSIZ];
int ret;
ret = sscanf(buf, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx %s",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5],
iface);
if (ret != 7) {
dprintk(err, "can't parse (%d): %s\n", ret, buf);
return -EINVAL;
}
ret = ethblk_target_disk_find_and_delete_initiator(d, mac, iface);
if (ret) {
dprintk(debug, "disk %s can't del initiator %s_%pM\n", d->name,
iface, mac);
count = ret;
}
return count;
}
static struct kobj_attribute ethblk_target_disk_ini_add_attr =
__ATTR(add, 0220, NULL, ethblk_target_disk_ini_add_store);
static struct kobj_attribute ethblk_target_disk_ini_delete_attr =
__ATTR(delete, 0220, NULL, ethblk_target_disk_ini_delete_store);
static struct attribute *ethblk_target_disk_inis_attrs[] = {
ðblk_target_disk_ini_add_attr.attr,
ðblk_target_disk_ini_delete_attr.attr, NULL
};
static struct attribute_group ethblk_target_disk_inis_group = {
.attrs = ethblk_target_disk_inis_attrs,
};
static struct kobj_type ethblk_target_disk_inis_kobj_type = {
.sysfs_ops = &kobj_sysfs_ops,
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
#define BLKDEV_PUT_MODE , FMODE_READ | FMODE_WRITE
#else
#define BLKDEV_PUT_MODE , NULL
#endif
static int ethblk_target_disk_create(unsigned short drv_id, char *path)
{
int ret = -EINVAL;
struct ethblk_target_disk *d;
struct request_queue *q;
dprintk(info, "creating disk drv_id:%d path:%s\n", drv_id, path);
d = xa_load(ðblk_target_disks, drv_id);
if (d) {
dprintk(err, "disk %s already exists: %px\n", d->name, d);
ret = -EEXIST;
goto out;
}
d = kzalloc(sizeof(struct ethblk_target_disk), GFP_KERNEL);
if (!d) {
dprintk(err, "can't allocate memory for disk eda%d\n", drv_id);
ret = -ENOMEM;
goto out;
}
d->drv_id = drv_id;
d->net_stat_enabled = net_stat;
uuid_gen(&d->uuid);
INIT_LIST_HEAD(&d->initiators);
INIT_WORK(&d->destroy_work, ethblk_target_destroy_disk_deferred);
INIT_WORK(&d->free_work, ethblk_target_disk_free_deferred);
ret = percpu_ref_init(&d->ref, ethblk_target_disk_free, 0, GFP_KERNEL);
if (ret) {
dprintk(err, "can't init percpu_ref: %d\n", ret);
goto out;
}
init_completion(&d->destroy_completion);
mutex_init(&d->initiator_lock);
if (ethblk_target_disk_net_stat_init(&d->stat) != 0) {
kfree(d);
d = NULL;
goto out;
}
snprintf(d->name, sizeof(d->name), "eda%d", drv_id);
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
d->bd = blkdev_get_by_path(path, FMODE_READ | FMODE_WRITE, NULL);
#else
d->bd = blkdev_get_by_path(path, FMODE_READ | FMODE_WRITE, NULL, NULL);
#endif
if (IS_ERR(d->bd)) {
dprintk(err, "disk %s can't open backing store %s: %ld\n",
d->name, path, PTR_ERR(d->bd));
d->bd = NULL;
goto out_err;
}
q = d->bd->bd_disk->queue;
ret = kobject_init_and_add(&d->kobj, ðblk_target_disk_kobj_type,
ðblk_sysfs_target_kobj, d->name);
if (ret) {
dprintk(err, "disk %s can't add kobject: %d\n", d->name, ret);
goto out_err;
}
ret = sysfs_create_group(&d->kobj, ðblk_target_disk_group);
if (ret) {
dprintk(err, "disk %s can't create sysfs group: %d\n", d->name,
ret);
goto out_d_kobj;
}
ret = kobject_init_and_add(&d->inis_kobj,
ðblk_target_disk_inis_kobj_type, &d->kobj,
"initiators");
if (ret) {
dprintk(err, "disk %s can't create sysfs group: %d\n", d->name,
ret);
goto out_sysfs;
}
ret = sysfs_create_group(&d->inis_kobj, ðblk_target_disk_inis_group);
if (ret) {
dprintk(err, "disk %s can't create sysfs group for inis: %d\n",
d->name, ret);
goto out_d_inis_kobj;
}
ret = bioset_init(&d->bs,
blk_queue_depth(d->bd->bd_disk->queue) * num_online_cpus(),
0, BIOSET_NEED_BVECS);
if (ret) {
dprintk(err, "disk %s can't init bioset: %d\n", d->name, ret);
goto out_sysfs_group;
}
d->backend_path = kstrdup(path, GFP_KERNEL);
xa_store(ðblk_target_disks, d->drv_id, d, GFP_KERNEL);
dprintk(info, "disk %s created\n", d->name);
ret = 0;
goto out;
out_sysfs_group:
sysfs_remove_group(&d->inis_kobj, ðblk_target_disk_inis_group);
out_d_inis_kobj:
kobject_del(&d->inis_kobj);
out_sysfs:
sysfs_remove_group(&d->kobj, ðblk_target_disk_group);
out_d_kobj:
kobject_del(&d->kobj);
out_err:
free_percpu(d->stat);
if (d->bd)
blkdev_put(d->bd BLKDEV_PUT_MODE);
kfree(d);
d = NULL;
out:
return ret;
};
static void ethblk_target_disk_free_deferred(struct work_struct *w)
{
struct ethblk_target_disk *d =
container_of(w, struct ethblk_target_disk, free_work);
unsigned short drv_id = d->drv_id;
dprintk(info, "freeing disk %s %px\n", d->name, d);
sysfs_remove_group(&d->inis_kobj, ðblk_target_disk_inis_group);
kobject_del(&d->inis_kobj);
sysfs_remove_group(&d->kobj, ðblk_target_disk_group);
kobject_del(&d->kobj);
xa_erase(ðblk_target_disks, d->drv_id);
blkdev_put(d->bd BLKDEV_PUT_MODE);
free_percpu(d->stat);
kfree(d->backend_path);
bioset_exit(&d->bs);
complete(&d->destroy_completion);
kfree_rcu(d, rcu);
dprintk(info, "disk %px eda%d freed\n", d, drv_id);
}
static void ethblk_target_disk_free(struct percpu_ref *ref)
{
struct ethblk_target_disk *d =
container_of(ref, struct ethblk_target_disk, ref);
schedule_work(&d->free_work);
}
static void ethblk_target_destroy_all_disks(void)
{
struct ethblk_target_disk *d;
unsigned long drv_id;
xa_for_each(ðblk_target_disks, drv_id, d) {
dprintk(info, "destroying %s %px\n", d->name, d);
percpu_ref_kill(&d->ref);
ethblk_target_disk_inis_free(d);
wait_for_completion(&d->destroy_completion);
}
}
static ssize_t ethblk_target_disk_create_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
unsigned short drv_id;
char path[256];
int ret;
ret = sscanf(buf, "%hu %s", &drv_id, path);
if (ret != 2) {
dprintk(err, "can't parse (%d): %s\n", ret, buf);
return -EINVAL;
}
ret = ethblk_target_disk_create(drv_id, path);
if (ret) {
dprintk(err, "can't create disk eda%d = %s: %d\n", drv_id,
path, ret);
count = ret;
}
return count;
}
static struct kobj_attribute ethblk_target_disk_create_attr =
__ATTR(create_disk, 0220, NULL, ethblk_target_disk_create_store);
static struct attribute *ethblk_sysfs_target_default_attrs[] = {
ðblk_target_disk_create_attr.attr, NULL
};
ATTRIBUTE_GROUPS(ethblk_sysfs_target_default);
static struct kobj_type ethblk_sysfs_target_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = ethblk_sysfs_target_default_groups,
};
static void ethblk_target_cmd_rw_complete(struct bio *);
static void ethblk_target_send_reply(struct ethblk_target_cmd *cmd);
static void ethblk_target_cmd_free(struct ethblk_target_cmd *cmd)
{
struct sk_buff *req_skb = cmd->req_skb;
dprintk(debug, "cmd %px\n", cmd);
if (!cmd)
return;
if (cmd->ini) {
if (cmd->ini->d)
ethblk_target_put_disk(cmd->ini->d);
ethblk_target_put_ini(cmd->ini);
}
if (cmd->bio)
bio_put(cmd->bio);
if (cmd->rep_skb)
consume_skb(cmd->rep_skb);
if (!cmd->in_headroom)
kmem_cache_free(ethblk_target_cmd_cache, cmd);
if (req_skb)
consume_skb(req_skb);
}
static void
ethblk_target_cmd_reply_fill_skb_headers(struct ethblk_target_cmd *cmd)
{
if (cmd->l3) {
struct ethhdr *eth =
(struct ethhdr *)skb_mac_header(cmd->rep_skb);
struct iphdr *ip = (struct iphdr *)(eth + 1);
struct udphdr *udp = (struct udphdr *)(ip + 1);
struct ethhdr *s_eth =
(struct ethhdr *)skb_mac_header(cmd->req_skb);
struct iphdr *s_ip = (struct iphdr *)(s_eth + 1);
struct udphdr *s_udp = (struct udphdr *)(s_ip + 1);
skb_put(cmd->rep_skb, sizeof(struct ethhdr) +
sizeof(struct iphdr) +
sizeof(struct udphdr));
cmd->rep_skb->protocol = htons(ETH_P_IP);
eth->h_proto = htons(ETH_P_IP);
ip->version = 4;
ip->ihl = 5;
ip->ttl = 255;
ip->saddr = s_ip->daddr;
ip->daddr = s_ip->saddr;
ip->protocol = IPPROTO_UDP;
ip->frag_off = htons(IP_DF);
ip->id = 0;
udp->source = s_udp->dest;
udp->dest = s_udp->source;
} else {
cmd->rep_skb->protocol = htons(eth_p_type);
}
}
static void
ethblk_target_cmd_reply_finalize_skb_headers(struct ethblk_target_cmd *cmd)
{
if (cmd->l3) {
struct ethblk_hdr *rep_hdr =
ethblk_network_skb_get_hdr(cmd->rep_skb);
struct ethhdr *eth =
(struct ethhdr *)skb_mac_header(cmd->rep_skb);
struct iphdr *ip = (struct iphdr *)(eth + 1);
struct udphdr *udp = (struct udphdr *)(ip + 1);
ether_addr_copy(eth->h_dest, rep_hdr->dst);
ether_addr_copy(eth->h_source, rep_hdr->src);
ip->tot_len = htons(cmd->rep_skb->len - sizeof(struct ethhdr));
udp->len = htons(ntohs(ip->tot_len) - sizeof(struct iphdr));
udp->check = 0;
ip_send_check(ip);
}
}
static void ethblk_target_cmd_id(struct ethblk_target_cmd *cmd)
{
struct sk_buff *req_skb = cmd->req_skb;
struct ethblk_hdr *req_hdr = cmd->req_hdr;
struct ethblk_hdr *rep_hdr;
struct ethblk_cfg_hdr *rep_cfg_hdr;
struct sk_buff *rep_skb;
unsigned short drv_id;
struct ethblk_target_disk *d;
struct ethblk_target_disk_net_stat *stat;
int len = ETH_ZLEN + 512;
drv_id = be16_to_cpu(req_hdr->drv_id);
d = ethblk_target_find_disk(drv_id);
if (!d) {
dprintk_ratelimit(err, "unknown drv_id %d\n", drv_id);
return;
}
dprintk(debug, "%s disk ID\n", d->name);
stat = get_cpu_ptr(d->stat);
cmd->ini =
ethblk_target_disk_initiator_find(d, req_hdr->src, req_skb->dev);
if (!cmd->ini) {
dprintk_ratelimit(err,
"initiator %s_%pM has no access to disk %s\n",
req_skb->dev->name, req_hdr->src, d->name);
/* can't use NET_STAT_INC, it needs initiator */
stat->_cnt.rx_dropped++;
goto out;
}
put_cpu_ptr(d->stat);
if (cmd->l3)
len += sizeof(struct iphdr) + sizeof(struct udphdr);
rep_skb = ethblk_network_new_skb(len);
if (!rep_skb) {
dprintk(debug, "can't allocate reply skb len %d\n", len);
NET_STAT_INC(cmd->ini, cnt.rx_dropped);
goto out;
}
cmd->rep_skb = rep_skb; /* fill/finalize_skb_headers need it*/
ethblk_target_cmd_reply_fill_skb_headers(cmd);
rep_hdr = ethblk_network_skb_get_hdr(rep_skb);
skb_put(rep_skb, ETHBLK_CFG_REPLY_SIZE);
ether_addr_copy(rep_hdr->src, req_skb->dev->dev_addr);
ether_addr_copy(rep_hdr->dst, req_hdr->src);
rep_hdr->type = cpu_to_be16(eth_p_type);
ETHBLK_HDR_SET_FLAGS(rep_hdr, ETHBLK_PROTO_VERSION, 0, 1);
rep_hdr->drv_id = cpu_to_be16(d->drv_id);
rep_hdr->tag = req_hdr->tag;
rep_hdr->op = req_hdr->op;
rep_hdr->lba = req_hdr->lba;
rep_hdr->num_sectors = req_hdr->num_sectors;
rep_skb->dev = req_skb->dev;
rep_cfg_hdr = (struct ethblk_cfg_hdr *)(rep_hdr + 1);
rep_cfg_hdr->q_depth = cpu_to_be16(blk_queue_depth(d->bd->bd_disk->queue));
rep_cfg_hdr->num_queues = cpu_to_be16(min(req_skb->dev->num_rx_queues, num_online_cpus()));
rep_cfg_hdr->num_sectors =
cpu_to_be64(i_size_read(d->bd->bd_inode) >> SECTOR_SHIFT);
uuid_copy((uuid_t *)rep_cfg_hdr->uuid, &d->uuid);
NET_STAT_INC(cmd->ini, cnt.rx_count);
ethblk_target_cmd_reply_finalize_skb_headers(cmd);
cmd->rep_skb = NULL; /* to avoid skb_clone */
if (ethblk_network_xmit_skb(rep_skb) == NET_XMIT_DROP)
NET_STAT_INC(cmd->ini, cnt.tx_count);
else
NET_STAT_INC(cmd->ini, cnt.tx_dropped);
out:
ethblk_target_cmd_free(cmd);
}
static void ethblk_target_cmd_rw(struct ethblk_target_cmd *cmd)
{
ssize_t rep_skb_alloc_len;
struct ethblk_hdr *req_hdr;
struct ethblk_hdr *rep_hdr;
struct sk_buff *rep_skb;
struct ethblk_target_disk *d;
unsigned long lba;
int len;
unsigned short drv_id;
struct request_queue *q;
struct bio *bio;
bool write;
struct scatterlist sgl[16];
int sgn;
struct sk_buff *req_skb = cmd->req_skb;
struct sk_buff *bio_skb;
int offset;
int i, ret;
struct scatterlist *sg;
req_hdr = cmd->req_hdr;
drv_id = be16_to_cpu(req_hdr->drv_id);
d = ethblk_target_find_disk(drv_id);
if (!d) {
dprintk_ratelimit(err, "unknown drv_id %d\n", drv_id);
goto out;
}
cmd->ini = ethblk_target_disk_initiator_find(d, req_hdr->src, req_skb->dev);
if (!cmd->ini) {
dprintk_ratelimit(err,
"initiator %s_%pM has no access to disk %s\n",
req_skb->dev->name, req_hdr->src, d->name);
goto out_drop;
}
q = bdev_get_queue(d->bd);
if (IS_ERR(q)) {
dprintk(err, "disk %s can't get queue: %ld\n", d->name,
PTR_ERR(q));
goto out_drop;
}
write = (req_hdr->op == ETHBLK_OP_WRITE);
lba = be64_to_cpu(req_hdr->lba);
len = req_hdr->num_sectors << SECTOR_SHIFT;
rep_skb_alloc_len = sizeof(struct ethblk_hdr);
if (cmd->l3)
rep_skb_alloc_len += ETHBLK_HDR_L3_SIZE;
rep_skb = ethblk_network_new_skb_with_payload(rep_skb_alloc_len,
(write ? 0 : len));