/*
* This file is part of the Chelsio T4 Ethernet driver for Linux.
* Copyright (C) 2003-2014 Chelsio Communications. All rights reserved.
*
* Written by Deepak ([email protected])
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
* release for licensing terms and conditions.
*/
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/jhash.h>
#include <linux/if_vlan.h>
#include <net/addrconf.h>
#include "cxgb4.h"
#include "clip_tbl.h"
static inline unsigned int ipv4_clip_hash(struct clip_tbl *c, const u32 *key)
{
unsigned int clipt_size_half = c->clipt_size / 2;
return jhash_1word(*key, 0) % clipt_size_half;
}
static inline unsigned int ipv6_clip_hash(struct clip_tbl *d, const u32 *key)
{
unsigned int clipt_size_half = d->clipt_size / 2;
u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
return clipt_size_half +
(jhash_1word(xor, 0) % clipt_size_half);
}
static unsigned int clip_addr_hash(struct clip_tbl *ctbl, const u32 *addr,
u8 v6)
{
return v6 ? ipv6_clip_hash(ctbl, addr) :
ipv4_clip_hash(ctbl, addr);
}
static int clip6_get_mbox(const struct net_device *dev,
const struct in6_addr *lip)
{
struct adapter *adap = netdev2adap(dev);
struct fw_clip_cmd c;
memset(&c, 0, sizeof(c));
c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
FW_CMD_REQUEST_F | FW_CMD_WRITE_F);
c.alloc_to_len16 = htonl(FW_CLIP_CMD_ALLOC_F | FW_LEN16(c));
*(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
*(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
}
static int clip6_release_mbox(const struct net_device *dev,
const struct in6_addr *lip)
{
struct adapter *adap = netdev2adap(dev);
struct fw_clip_cmd c;
memset(&c, 0, sizeof(c));
c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
FW_CMD_REQUEST_F | FW_CMD_READ_F);
c.alloc_to_len16 = htonl(FW_CLIP_CMD_FREE_F | FW_LEN16(c));
*(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
*(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
}
int cxgb4_clip_get(const struct net_device *dev, const u32 *lip, u8 v6)
{
struct adapter *adap = netdev2adap(dev);
struct clip_tbl *ctbl = adap->clipt;
struct clip_entry *ce, *cte;
u32 *addr = (u32 *)lip;
int hash;
int ret = -1;
if (!ctbl)
return 0;
hash = clip_addr_hash(ctbl, addr, v6);
read_lock_bh(&ctbl->lock);
list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
if (cte->addr6.sin6_family == AF_INET6 && v6)
ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
sizeof(struct in6_addr));
else if (cte->addr.sin_family == AF_INET && !v6)
ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
sizeof(struct in_addr));
if (!ret) {
ce = cte;
read_unlock_bh(&ctbl->lock);
refcount_inc(&ce->refcnt);
return 0;
}
}
read_unlock_bh(&ctbl->lock);
write_lock_bh(&ctbl->lock);
if (!list_empty(&ctbl->ce_free_head)) {
ce = list_first_entry(&ctbl->ce_free_head,
struct clip_entry, list);
list_del_init(&ce->list);
spin_lock_init(&ce->lock);
refcount_set(&ce->refcnt, 0);
atomic_dec(&ctbl->nfree);
list_add_tail(&ce->list, &ctbl->hash_list[hash]);
if (v6) {
ce->addr6.sin6_family = AF_INET6;
memcpy(ce->addr6.sin6_addr.s6_addr,
lip, sizeof(struct in6_addr));
ret = clip6_get_mbox(dev, (const struct in6_addr *)lip);
if (ret) {
write_unlock_bh(&ctbl->lock);
dev_err(adap->pdev_dev,
"CLIP FW cmd failed with error %d, "
"Connections using %pI6c wont be "
"offloaded",
ret, ce->addr6.sin6_addr.s6_addr);
return ret;
}
} else {
ce->addr.sin_family = AF_INET;
memcpy((char *)(&ce->addr.sin_addr), lip,
sizeof(struct in_addr));
}
} else {
write_unlock_bh(&ctbl->lock);
dev_info(adap->pdev_dev, "CLIP table overflow, "
"Connections using %pI6c wont be offloaded",
(void *)lip);
return -ENOMEM;
}
write_unlock_bh(&ctbl->lock);
refcount_set(&ce->refcnt, 1);
return 0;
}
EXPORT_SYMBOL(cxgb4_clip_get);
void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6)
{
struct adapter *adap = netdev2adap(dev);
struct clip_tbl *ctbl = adap->clipt;
struct clip_entry *ce, *cte;
u32 *addr = (u32 *)lip;
int hash;
int ret = -1;
if (!ctbl)
return;
hash = clip_addr_hash(ctbl, addr, v6);
read_lock_bh(&ctbl->lock);
list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
if (cte->addr6.sin6_family == AF_INET6 && v6)
ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
sizeof(struct in6_addr));
else if (cte->addr.sin_family == AF_INET && !v6)
ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
sizeof(struct in_addr));
if (!ret) {
ce = cte;
read_unlock_bh(&ctbl->lock);
goto found;
}
}
read_unlock_bh(&ctbl->lock);
return;
found:
write_lock_bh(&ctbl->lock);
spin_lock_bh(&ce->lock);
if (refcount_dec_and_test(&ce->refcnt)) {
list_del_init(&ce->list);
list_add_tail(&ce->list, &ctbl->ce_free_head);
atomic_inc(&ctbl->nfree);
if (v6)
clip6_release_mbox(dev, (const struct in6_addr *)lip);
}
spin_unlock_bh(&ce->lock);
write_unlock_bh(&ctbl->lock);
}
EXPORT_SYMBOL(cxgb4_clip_release);
/* Retrieves IPv6 addresses from a root device (bond, vlan) associated with
* a physical device.
* The physical device reference is needed to send the actul CLIP command.
*/
static int cxgb4_update_dev_clip(struct net_device *root_dev,
struct net_device *dev)
{
struct inet6_dev *idev = NULL;
struct inet6_ifaddr *ifa;
int ret = 0;
idev = __in6_dev_get(root_dev);
if (!idev)
return ret;
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
ret = cxgb4_clip_get(dev, (const u32 *)ifa->addr.s6_addr, 1);
if (ret < 0)
break;
}
read_unlock_bh(&idev->lock);
return ret;
}
int cxgb4_update_root_dev_clip(struct net_device *dev)
{
struct net_device *root_dev = NULL;
int i, ret = 0;
/* First populate the real net device's IPv6 addresses */
ret = cxgb4_update_dev_clip(dev, dev);
if (ret)
return ret;
/* Parse all bond and vlan devices layered on top of the physical dev */
root_dev = netdev_master_upper_dev_get_rcu(dev);
if (root_dev) {
ret = cxgb4_update_dev_clip(root_dev, dev);
if (ret)
return ret;
}
for (i = 0; i < VLAN_N_VID; i++) {
root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
if (!root_dev)
continue;
ret = cxgb4_update_dev_clip(root_dev, dev);
if (ret)
break;
}
return ret;
}
EXPORT_SYMBOL(cxgb4_update_root_dev_clip);
int clip_tbl_show(struct seq_file *seq, void *v)
{
struct adapter *adapter = seq->private;
struct clip_tbl *ctbl = adapter->clipt;
struct clip_entry *ce;
char ip[60];
int i;
read_lock_bh(&ctbl->lock);
seq_puts(seq, "IP Address Users\n");
for (i = 0 ; i < ctbl->clipt_size; ++i) {
list_for_each_entry(ce, &ctbl->hash_list[i], list) {
ip[0] = '\0';
sprintf(ip, "%pISc", &ce->addr);
seq_printf(seq, "%-25s %u\n", ip,
refcount_read(&ce->refcnt));
}
}
seq_printf(seq, "Free clip entries : %d\n", atomic_read(&ctbl->nfree));
read_unlock_bh(&ctbl->lock);
return 0;
}
struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
unsigned int clipt_end)
{
struct clip_entry *cl_list;
struct clip_tbl *ctbl;
unsigned int clipt_size;
int i;
if (clipt_start >= clipt_end)
return NULL;
clipt_size = clipt_end - clipt_start + 1;
if (clipt_size < CLIPT_MIN_HASH_BUCKETS)
return NULL;
ctbl = kvzalloc(struct_size(ctbl, hash_list, clipt_size), GFP_KERNEL);
if (!ctbl)
return NULL;
ctbl->clipt_start = clipt_start;
ctbl->clipt_size = clipt_size;
INIT_LIST_HEAD(&ctbl->ce_free_head);
atomic_set(&ctbl->nfree, clipt_size);
rwlock_init(&ctbl->lock);
for (i = 0; i < ctbl->clipt_size; ++i)
INIT_LIST_HEAD(&ctbl->hash_list[i]);
cl_list = kvcalloc(clipt_size, sizeof(struct clip_entry), GFP_KERNEL);
if (!cl_list) {
kvfree(ctbl);
return NULL;
}
ctbl->cl_list = (void *)cl_list;
for (i = 0; i < clipt_size; i++) {
INIT_LIST_HEAD(&cl_list[i].list);
list_add_tail(&cl_list[i].list, &ctbl->ce_free_head);
}
return ctbl;
}
void t4_cleanup_clip_tbl(struct adapter *adap)
{
struct clip_tbl *ctbl = adap->clipt;
if (ctbl) {
kvfree(ctbl->cl_list);
kvfree(ctbl);
}
}
EXPORT_SYMBOL(t4_cleanup_clip_tbl);
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