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OpenCloudOS-Kernel/drivers/infiniband/ulp/ipoib/ipoib_main.c

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/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2004 Voltaire, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "ipoib.h"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/if_arp.h> /* For ARPHRD_xxx */
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/jhash.h>
#include <net/arp.h>
#include <net/addrconf.h>
#include <linux/inetdevice.h>
#include <rdma/ib_cache.h>
#define DRV_VERSION "1.0.0"
const char ipoib_driver_version[] = DRV_VERSION;
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
MODULE_LICENSE("Dual BSD/GPL");
int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
int ipoib_debug_level;
module_param_named(debug_level, ipoib_debug_level, int, 0644);
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
#endif
struct ipoib_path_iter {
struct net_device *dev;
struct ipoib_path path;
};
static const u8 ipv4_bcast_addr[] = {
0x00, 0xff, 0xff, 0xff,
0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
};
struct workqueue_struct *ipoib_workqueue;
struct ib_sa_client ipoib_sa_client;
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static void ipoib_neigh_reclaim(struct rcu_head *rp);
static struct net_device *ipoib_get_net_dev_by_params(
struct ib_device *dev, u8 port, u16 pkey,
const union ib_gid *gid, const struct sockaddr *addr,
void *client_data);
static int ipoib_set_mac(struct net_device *dev, void *addr);
static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
int cmd);
static struct ib_client ipoib_client = {
.name = "ipoib",
.add = ipoib_add_one,
.remove = ipoib_remove_one,
.get_net_dev_by_params = ipoib_get_net_dev_by_params,
};
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static int ipoib_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netdev_notifier_info *ni = ptr;
struct net_device *dev = ni->dev;
if (dev->netdev_ops->ndo_open != ipoib_open)
return NOTIFY_DONE;
switch (event) {
case NETDEV_REGISTER:
ipoib_create_debug_files(dev);
break;
case NETDEV_CHANGENAME:
ipoib_delete_debug_files(dev);
ipoib_create_debug_files(dev);
break;
case NETDEV_UNREGISTER:
ipoib_delete_debug_files(dev);
break;
}
return NOTIFY_DONE;
}
#endif
int ipoib_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "bringing up interface\n");
netif_carrier_off(dev);
set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
priv->sm_fullmember_sendonly_support = false;
if (ipoib_ib_dev_open(dev)) {
if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
return 0;
goto err_disable;
}
ipoib_ib_dev_up(dev);
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
struct ipoib_dev_priv *cpriv;
/* Bring up any child interfaces too */
down_read(&priv->vlan_rwsem);
list_for_each_entry(cpriv, &priv->child_intfs, list) {
int flags;
flags = cpriv->dev->flags;
if (flags & IFF_UP)
continue;
dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
}
up_read(&priv->vlan_rwsem);
}
netif_start_queue(dev);
return 0;
err_disable:
clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
return -EINVAL;
}
static int ipoib_stop(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "stopping interface\n");
clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
netif_stop_queue(dev);
ipoib_ib_dev_down(dev);
ipoib_ib_dev_stop(dev);
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
struct ipoib_dev_priv *cpriv;
/* Bring down any child interfaces too */
down_read(&priv->vlan_rwsem);
list_for_each_entry(cpriv, &priv->child_intfs, list) {
int flags;
flags = cpriv->dev->flags;
if (!(flags & IFF_UP))
continue;
dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
}
up_read(&priv->vlan_rwsem);
}
return 0;
}
static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
return features;
}
static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int ret = 0;
/* dev->mtu > 2K ==> connected mode */
if (ipoib_cm_admin_enabled(dev)) {
if (new_mtu > ipoib_cm_max_mtu(dev))
return -EINVAL;
if (new_mtu > priv->mcast_mtu)
ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
priv->mcast_mtu);
dev->mtu = new_mtu;
return 0;
}
if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
return -EINVAL;
priv->admin_mtu = new_mtu;
if (priv->mcast_mtu < priv->admin_mtu)
ipoib_dbg(priv, "MTU must be smaller than the underlying "
"link layer MTU - 4 (%u)\n", priv->mcast_mtu);
new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
if (priv->rn_ops->ndo_change_mtu) {
bool carrier_status = netif_carrier_ok(dev);
netif_carrier_off(dev);
/* notify lower level on the real mtu */
ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
if (carrier_status)
netif_carrier_on(dev);
} else {
dev->mtu = new_mtu;
}
return ret;
}
static void ipoib_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if (priv->rn_ops->ndo_get_stats64)
priv->rn_ops->ndo_get_stats64(dev, stats);
else
netdev_stats_to_stats64(stats, &dev->stats);
}
/* Called with an RCU read lock taken */
static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
struct net_device *dev)
{
struct net *net = dev_net(dev);
struct in_device *in_dev;
struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
__be32 ret_addr;
switch (addr->sa_family) {
case AF_INET:
in_dev = in_dev_get(dev);
if (!in_dev)
return false;
ret_addr = inet_confirm_addr(net, in_dev, 0,
addr_in->sin_addr.s_addr,
RT_SCOPE_HOST);
in_dev_put(in_dev);
if (ret_addr)
return true;
break;
case AF_INET6:
if (IS_ENABLED(CONFIG_IPV6) &&
ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
return true;
break;
}
return false;
}
/**
* Find the master net_device on top of the given net_device.
* @dev: base IPoIB net_device
*
* Returns the master net_device with a reference held, or the same net_device
* if no master exists.
*/
static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
{
struct net_device *master;
rcu_read_lock();
master = netdev_master_upper_dev_get_rcu(dev);
if (master)
dev_hold(master);
rcu_read_unlock();
if (master)
return master;
dev_hold(dev);
return dev;
}
struct ipoib_walk_data {
const struct sockaddr *addr;
struct net_device *result;
};
static int ipoib_upper_walk(struct net_device *upper, void *_data)
{
struct ipoib_walk_data *data = _data;
int ret = 0;
if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
dev_hold(upper);
data->result = upper;
ret = 1;
}
return ret;
}
/**
* Find a net_device matching the given address, which is an upper device of
* the given net_device.
* @addr: IP address to look for.
* @dev: base IPoIB net_device
*
* If found, returns the net_device with a reference held. Otherwise return
* NULL.
*/
static struct net_device *ipoib_get_net_dev_match_addr(
const struct sockaddr *addr, struct net_device *dev)
{
struct ipoib_walk_data data = {
.addr = addr,
};
rcu_read_lock();
if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
dev_hold(dev);
data.result = dev;
goto out;
}
netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
out:
rcu_read_unlock();
return data.result;
}
/* returns the number of IPoIB netdevs on top a given ipoib device matching a
* pkey_index and address, if one exists.
*
* @found_net_dev: contains a matching net_device if the return value >= 1,
* with a reference held. */
static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
const union ib_gid *gid,
u16 pkey_index,
const struct sockaddr *addr,
int nesting,
struct net_device **found_net_dev)
{
struct ipoib_dev_priv *child_priv;
struct net_device *net_dev = NULL;
int matches = 0;
if (priv->pkey_index == pkey_index &&
(!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
if (!addr) {
net_dev = ipoib_get_master_net_dev(priv->dev);
} else {
/* Verify the net_device matches the IP address, as
* IPoIB child devices currently share a GID. */
net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
}
if (net_dev) {
if (!*found_net_dev)
*found_net_dev = net_dev;
else
dev_put(net_dev);
++matches;
}
}
/* Check child interfaces */
down_read_nested(&priv->vlan_rwsem, nesting);
list_for_each_entry(child_priv, &priv->child_intfs, list) {
matches += ipoib_match_gid_pkey_addr(child_priv, gid,
pkey_index, addr,
nesting + 1,
found_net_dev);
if (matches > 1)
break;
}
up_read(&priv->vlan_rwsem);
return matches;
}
/* Returns the number of matching net_devs found (between 0 and 2). Also
* return the matching net_device in the @net_dev parameter, holding a
* reference to the net_device, if the number of matches >= 1 */
static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
u16 pkey_index,
const union ib_gid *gid,
const struct sockaddr *addr,
struct net_device **net_dev)
{
struct ipoib_dev_priv *priv;
int matches = 0;
*net_dev = NULL;
list_for_each_entry(priv, dev_list, list) {
if (priv->port != port)
continue;
matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
addr, 0, net_dev);
if (matches > 1)
break;
}
return matches;
}
static struct net_device *ipoib_get_net_dev_by_params(
struct ib_device *dev, u8 port, u16 pkey,
const union ib_gid *gid, const struct sockaddr *addr,
void *client_data)
{
struct net_device *net_dev;
struct list_head *dev_list = client_data;
u16 pkey_index;
int matches;
int ret;
if (!rdma_protocol_ib(dev, port))
return NULL;
ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
if (ret)
return NULL;
if (!dev_list)
return NULL;
/* See if we can find a unique device matching the L2 parameters */
matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
gid, NULL, &net_dev);
switch (matches) {
case 0:
return NULL;
case 1:
return net_dev;
}
dev_put(net_dev);
/* Couldn't find a unique device with L2 parameters only. Use L3
* address to uniquely match the net device */
matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
gid, addr, &net_dev);
switch (matches) {
case 0:
return NULL;
default:
dev_warn_ratelimited(&dev->dev,
"duplicate IP address detected\n");
/* Fall through */
case 1:
return net_dev;
}
}
int ipoib_set_mode(struct net_device *dev, const char *buf)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
!strcmp(buf, "connected\n")) ||
(!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
!strcmp(buf, "datagram\n"))) {
return 0;
}
/* flush paths if we switch modes so that connections are restarted */
if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
ipoib_warn(priv, "enabling connected mode "
"will cause multicast packet drops\n");
netdev_update_features(dev);
dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
rtnl_unlock();
priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
ipoib_flush_paths(dev);
return (!rtnl_trylock()) ? -EBUSY : 0;
}
if (!strcmp(buf, "datagram\n")) {
clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
netdev_update_features(dev);
dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
rtnl_unlock();
ipoib_flush_paths(dev);
return (!rtnl_trylock()) ? -EBUSY : 0;
}
return -EINVAL;
}
struct ipoib_path *__path_find(struct net_device *dev, void *gid)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rb_node *n = priv->path_tree.rb_node;
struct ipoib_path *path;
int ret;
while (n) {
path = rb_entry(n, struct ipoib_path, rb_node);
ret = memcmp(gid, path->pathrec.dgid.raw,
sizeof (union ib_gid));
if (ret < 0)
n = n->rb_left;
else if (ret > 0)
n = n->rb_right;
else
return path;
}
return NULL;
}
static int __path_add(struct net_device *dev, struct ipoib_path *path)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rb_node **n = &priv->path_tree.rb_node;
struct rb_node *pn = NULL;
struct ipoib_path *tpath;
int ret;
while (*n) {
pn = *n;
tpath = rb_entry(pn, struct ipoib_path, rb_node);
ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
sizeof (union ib_gid));
if (ret < 0)
n = &pn->rb_left;
else if (ret > 0)
n = &pn->rb_right;
else
return -EEXIST;
}
rb_link_node(&path->rb_node, pn, n);
rb_insert_color(&path->rb_node, &priv->path_tree);
list_add_tail(&path->list, &priv->path_list);
return 0;
}
static void path_free(struct net_device *dev, struct ipoib_path *path)
{
struct sk_buff *skb;
while ((skb = __skb_dequeue(&path->queue)))
dev_kfree_skb_irq(skb);
ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
/* remove all neigh connected to this path */
ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
if (path->ah)
ipoib_put_ah(path->ah);
kfree(path);
}
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
{
struct ipoib_path_iter *iter;
iter = kmalloc(sizeof(*iter), GFP_KERNEL);
if (!iter)
return NULL;
iter->dev = dev;
memset(iter->path.pathrec.dgid.raw, 0, 16);
if (ipoib_path_iter_next(iter)) {
kfree(iter);
return NULL;
}
return iter;
}
int ipoib_path_iter_next(struct ipoib_path_iter *iter)
{
struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
struct rb_node *n;
struct ipoib_path *path;
int ret = 1;
spin_lock_irq(&priv->lock);
n = rb_first(&priv->path_tree);
while (n) {
path = rb_entry(n, struct ipoib_path, rb_node);
if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
sizeof (union ib_gid)) < 0) {
iter->path = *path;
ret = 0;
break;
}
n = rb_next(n);
}
spin_unlock_irq(&priv->lock);
return ret;
}
void ipoib_path_iter_read(struct ipoib_path_iter *iter,
struct ipoib_path *path)
{
*path = iter->path;
}
#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
void ipoib_mark_paths_invalid(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_path *path, *tp;
spin_lock_irq(&priv->lock);
list_for_each_entry_safe(path, tp, &priv->path_list, list) {
ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
path->pathrec.dgid.raw);
if (path->ah)
path->ah->valid = 0;
}
spin_unlock_irq(&priv->lock);
}
static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
{
struct ipoib_pseudo_header *phdr;
phdr = skb_push(skb, sizeof(*phdr));
memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
}
void ipoib_flush_paths(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_path *path, *tp;
LIST_HEAD(remove_list);
unsigned long flags;
netif_tx_lock_bh(dev);
spin_lock_irqsave(&priv->lock, flags);
list_splice_init(&priv->path_list, &remove_list);
list_for_each_entry(path, &remove_list, list)
rb_erase(&path->rb_node, &priv->path_tree);
list_for_each_entry_safe(path, tp, &remove_list, list) {
if (path->query)
ib_sa_cancel_query(path->query_id, path->query);
spin_unlock_irqrestore(&priv->lock, flags);
netif_tx_unlock_bh(dev);
wait_for_completion(&path->done);
path_free(dev, path);
netif_tx_lock_bh(dev);
spin_lock_irqsave(&priv->lock, flags);
}
spin_unlock_irqrestore(&priv->lock, flags);
netif_tx_unlock_bh(dev);
}
static void path_rec_completion(int status,
struct sa_path_rec *pathrec,
void *path_ptr)
{
struct ipoib_path *path = path_ptr;
struct net_device *dev = path->dev;
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_ah *ah = NULL;
struct ipoib_ah *old_ah = NULL;
struct ipoib_neigh *neigh, *tn;
struct sk_buff_head skqueue;
struct sk_buff *skb;
unsigned long flags;
if (!status)
ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
be32_to_cpu(sa_path_get_dlid(pathrec)),
pathrec->dgid.raw);
else
ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
status, path->pathrec.dgid.raw);
skb_queue_head_init(&skqueue);
if (!status) {
struct rdma_ah_attr av;
if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
pathrec, &av, NULL)) {
ah = ipoib_create_ah(dev, priv->pd, &av);
rdma_destroy_ah_attr(&av);
}
}
spin_lock_irqsave(&priv->lock, flags);
if (!IS_ERR_OR_NULL(ah)) {
/*
* pathrec.dgid is used as the database key from the LLADDR,
* it must remain unchanged even if the SA returns a different
* GID to use in the AH.
*/
if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
sizeof(union ib_gid))) {
ipoib_dbg(
priv,
"%s got PathRec for gid %pI6 while asked for %pI6\n",
dev->name, pathrec->dgid.raw,
path->pathrec.dgid.raw);
memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
sizeof(union ib_gid));
}
path->pathrec = *pathrec;
old_ah = path->ah;
path->ah = ah;
ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
pathrec->sl);
while ((skb = __skb_dequeue(&path->queue)))
__skb_queue_tail(&skqueue, skb);
list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
if (neigh->ah) {
WARN_ON(neigh->ah != old_ah);
/*
* Dropping the ah reference inside
* priv->lock is safe here, because we
* will hold one more reference from
* the original value of path->ah (ie
* old_ah).
*/
ipoib_put_ah(neigh->ah);
}
kref_get(&path->ah->ref);
neigh->ah = path->ah;
if (ipoib_cm_enabled(dev, neigh->daddr)) {
if (!ipoib_cm_get(neigh))
ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
path,
neigh));
if (!ipoib_cm_get(neigh)) {
ipoib_neigh_free(neigh);
continue;
}
}
while ((skb = __skb_dequeue(&neigh->queue)))
__skb_queue_tail(&skqueue, skb);
}
path->ah->valid = 1;
}
path->query = NULL;
complete(&path->done);
spin_unlock_irqrestore(&priv->lock, flags);
if (IS_ERR_OR_NULL(ah))
ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
if (old_ah)
ipoib_put_ah(old_ah);
while ((skb = __skb_dequeue(&skqueue))) {
int ret;
skb->dev = dev;
ret = dev_queue_xmit(skb);
if (ret)
ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
__func__, ret);
}
}
static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
void *gid)
{
path->dev = priv->dev;
if (rdma_cap_opa_ah(priv->ca, priv->port))
path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
else
path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
path->pathrec.sgid = priv->local_gid;
path->pathrec.pkey = cpu_to_be16(priv->pkey);
path->pathrec.numb_path = 1;
path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
}
static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_path *path;
if (!priv->broadcast)
return NULL;
path = kzalloc(sizeof(*path), GFP_ATOMIC);
if (!path)
return NULL;
skb_queue_head_init(&path->queue);
INIT_LIST_HEAD(&path->neigh_list);
init_path_rec(priv, path, gid);
return path;
}
static int path_rec_start(struct net_device *dev,
struct ipoib_path *path)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "Start path record lookup for %pI6\n",
path->pathrec.dgid.raw);
init_completion(&path->done);
path->query_id =
ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
&path->pathrec,
IB_SA_PATH_REC_DGID |
IB_SA_PATH_REC_SGID |
IB_SA_PATH_REC_NUMB_PATH |
IB_SA_PATH_REC_TRAFFIC_CLASS |
IB_SA_PATH_REC_PKEY,
1000, GFP_ATOMIC,
path_rec_completion,
path, &path->query);
if (path->query_id < 0) {
ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
path->query = NULL;
complete(&path->done);
return path->query_id;
}
return 0;
}
static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_path *path;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
path = __path_find(dev, daddr + 4);
if (!path)
goto out;
if (!path->query)
path_rec_start(dev, path);
out:
spin_unlock_irqrestore(&priv->lock, flags);
}
static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
struct ipoib_path *path;
struct ipoib_neigh *neigh;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
neigh = ipoib_neigh_alloc(daddr, dev);
if (!neigh) {
spin_unlock_irqrestore(&priv->lock, flags);
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
return NULL;
}
/* To avoid race condition, make sure that the
* neigh will be added only once.
*/
if (unlikely(!list_empty(&neigh->list))) {
spin_unlock_irqrestore(&priv->lock, flags);
return neigh;
}
path = __path_find(dev, daddr + 4);
if (!path) {
path = path_rec_create(dev, daddr + 4);
if (!path)
goto err_path;
__path_add(dev, path);
}
list_add_tail(&neigh->list, &path->neigh_list);
if (path->ah && path->ah->valid) {
kref_get(&path->ah->ref);
neigh->ah = path->ah;
if (ipoib_cm_enabled(dev, neigh->daddr)) {
if (!ipoib_cm_get(neigh))
ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
if (!ipoib_cm_get(neigh)) {
ipoib_neigh_free(neigh);
goto err_drop;
}
if (skb_queue_len(&neigh->queue) <
IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, neigh->daddr);
__skb_queue_tail(&neigh->queue, skb);
} else {
ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
skb_queue_len(&neigh->queue));
goto err_drop;
}
} else {
spin_unlock_irqrestore(&priv->lock, flags);
path->ah->last_send = rn->send(dev, skb, path->ah->ah,
IPOIB_QPN(daddr));
ipoib_neigh_put(neigh);
return NULL;
}
} else {
neigh->ah = NULL;
if (!path->query && path_rec_start(dev, path))
goto err_path;
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, neigh->daddr);
__skb_queue_tail(&neigh->queue, skb);
} else {
goto err_drop;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_neigh_put(neigh);
return NULL;
err_path:
ipoib_neigh_free(neigh);
err_drop:
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_neigh_put(neigh);
return NULL;
}
static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
struct ipoib_pseudo_header *phdr)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
struct ipoib_path *path;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
/* no broadcast means that all paths are (going to be) not valid */
if (!priv->broadcast)
goto drop_and_unlock;
path = __path_find(dev, phdr->hwaddr + 4);
if (!path || !path->ah || !path->ah->valid) {
if (!path) {
path = path_rec_create(dev, phdr->hwaddr + 4);
if (!path)
goto drop_and_unlock;
__path_add(dev, path);
} else {
/*
* make sure there are no changes in the existing
* path record
*/
init_path_rec(priv, path, phdr->hwaddr + 4);
}
if (!path->query && path_rec_start(dev, path)) {
goto drop_and_unlock;
}
if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, phdr->hwaddr);
__skb_queue_tail(&path->queue, skb);
goto unlock;
} else {
goto drop_and_unlock;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_dbg(priv, "Send unicast ARP to %08x\n",
be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
path->ah->last_send = rn->send(dev, skb, path->ah->ah,
IPOIB_QPN(phdr->hwaddr));
return;
drop_and_unlock:
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
unlock:
spin_unlock_irqrestore(&priv->lock, flags);
}
static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
struct ipoib_neigh *neigh;
struct ipoib_pseudo_header *phdr;
struct ipoib_header *header;
unsigned long flags;
phdr = (struct ipoib_pseudo_header *) skb->data;
skb_pull(skb, sizeof(*phdr));
header = (struct ipoib_header *) skb->data;
if (unlikely(phdr->hwaddr[4] == 0xff)) {
/* multicast, arrange "if" according to probability */
if ((header->proto != htons(ETH_P_IP)) &&
(header->proto != htons(ETH_P_IPV6)) &&
(header->proto != htons(ETH_P_ARP)) &&
(header->proto != htons(ETH_P_RARP)) &&
(header->proto != htons(ETH_P_TIPC))) {
/* ethertype not supported by IPoIB */
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/* Add in the P_Key for multicast*/
phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
phdr->hwaddr[9] = priv->pkey & 0xff;
neigh = ipoib_neigh_get(dev, phdr->hwaddr);
if (likely(neigh))
goto send_using_neigh;
ipoib_mcast_send(dev, phdr->hwaddr, skb);
return NETDEV_TX_OK;
}
/* unicast, arrange "switch" according to probability */
switch (header->proto) {
case htons(ETH_P_IP):
case htons(ETH_P_IPV6):
case htons(ETH_P_TIPC):
neigh = ipoib_neigh_get(dev, phdr->hwaddr);
if (unlikely(!neigh)) {
neigh = neigh_add_path(skb, phdr->hwaddr, dev);
if (likely(!neigh))
return NETDEV_TX_OK;
}
break;
case htons(ETH_P_ARP):
case htons(ETH_P_RARP):
/* for unicast ARP and RARP should always perform path find */
unicast_arp_send(skb, dev, phdr);
return NETDEV_TX_OK;
default:
/* ethertype not supported by IPoIB */
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
send_using_neigh:
/* note we now hold a ref to neigh */
if (ipoib_cm_get(neigh)) {
if (ipoib_cm_up(neigh)) {
ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
goto unref;
}
} else if (neigh->ah && neigh->ah->valid) {
neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
IPOIB_QPN(phdr->hwaddr));
goto unref;
} else if (neigh->ah) {
neigh_refresh_path(neigh, phdr->hwaddr, dev);
}
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, phdr->hwaddr);
spin_lock_irqsave(&priv->lock, flags);
__skb_queue_tail(&neigh->queue, skb);
spin_unlock_irqrestore(&priv->lock, flags);
} else {
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
unref:
ipoib_neigh_put(neigh);
return NETDEV_TX_OK;
}
static void ipoib_timeout(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
jiffies_to_msecs(jiffies - dev_trans_start(dev)));
ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
netif_queue_stopped(dev),
priv->tx_head, priv->tx_tail);
/* XXX reset QP, etc. */
}
static int ipoib_hard_header(struct sk_buff *skb,
struct net_device *dev,
unsigned short type,
const void *daddr,
const void *saddr,
unsigned int len)
{
struct ipoib_header *header;
header = skb_push(skb, sizeof(*header));
header->proto = htons(type);
header->reserved = 0;
/*
* we don't rely on dst_entry structure, always stuff the
* destination address into skb hard header so we can figure out where
* to send the packet later.
*/
push_pseudo_header(skb, daddr);
return IPOIB_HARD_LEN;
}
static void ipoib_set_mcast_list(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
return;
}
queue_work(priv->wq, &priv->restart_task);
}
static int ipoib_get_iflink(const struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
/* parent interface */
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
return dev->ifindex;
/* child/vlan interface */
return priv->parent->ifindex;
}
static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
{
/*
* Use only the address parts that contributes to spreading
* The subnet prefix is not used as one can not connect to
* same remote port (GUID) using the same remote QPN via two
* different subnets.
*/
/* qpn octets[1:4) & port GUID octets[12:20) */
u32 *d32 = (u32 *) daddr;
u32 hv;
hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
return hv & htbl->mask;
}
struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
struct ipoib_neigh *neigh = NULL;
u32 hash_val;
rcu_read_lock_bh();
htbl = rcu_dereference_bh(ntbl->htbl);
if (!htbl)
goto out_unlock;
hash_val = ipoib_addr_hash(htbl, daddr);
for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
neigh != NULL;
neigh = rcu_dereference_bh(neigh->hnext)) {
if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
/* found, take one ref on behalf of the caller */
if (!atomic_inc_not_zero(&neigh->refcnt)) {
/* deleted */
neigh = NULL;
goto out_unlock;
}
if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
neigh->alive = jiffies;
goto out_unlock;
}
}
out_unlock:
rcu_read_unlock_bh();
return neigh;
}
static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
{
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
unsigned long neigh_obsolete;
unsigned long dt;
unsigned long flags;
int i;
LIST_HEAD(remove_list);
spin_lock_irqsave(&priv->lock, flags);
htbl = rcu_dereference_protected(ntbl->htbl,
lockdep_is_held(&priv->lock));
if (!htbl)
goto out_unlock;
/* neigh is obsolete if it was idle for two GC periods */
dt = 2 * arp_tbl.gc_interval;
neigh_obsolete = jiffies - dt;
for (i = 0; i < htbl->size; i++) {
struct ipoib_neigh *neigh;
struct ipoib_neigh __rcu **np = &htbl->buckets[i];
while ((neigh = rcu_dereference_protected(*np,
lockdep_is_held(&priv->lock))) != NULL) {
/* was the neigh idle for two GC periods */
if (time_after(neigh_obsolete, neigh->alive)) {
ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
rcu_assign_pointer(*np,
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from path/mc list */
list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
} else {
np = &neigh->hnext;
}
}
}
out_unlock:
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_mcast_remove_list(&remove_list);
}
static void ipoib_reap_neigh(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
__ipoib_reap_neigh(priv);
queue_delayed_work(priv->wq, &priv->neigh_reap_task,
arp_tbl.gc_interval);
}
static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
struct net_device *dev)
{
struct ipoib_neigh *neigh;
neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
if (!neigh)
return NULL;
neigh->dev = dev;
memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
skb_queue_head_init(&neigh->queue);
INIT_LIST_HEAD(&neigh->list);
ipoib_cm_set(neigh, NULL);
/* one ref on behalf of the caller */
atomic_set(&neigh->refcnt, 1);
return neigh;
}
struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
struct ipoib_neigh *neigh;
u32 hash_val;
htbl = rcu_dereference_protected(ntbl->htbl,
lockdep_is_held(&priv->lock));
if (!htbl) {
neigh = NULL;
goto out_unlock;
}
/* need to add a new neigh, but maybe some other thread succeeded?
* recalc hash, maybe hash resize took place so we do a search
*/
hash_val = ipoib_addr_hash(htbl, daddr);
for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
lockdep_is_held(&priv->lock));
neigh != NULL;
neigh = rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock))) {
if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
/* found, take one ref on behalf of the caller */
if (!atomic_inc_not_zero(&neigh->refcnt)) {
/* deleted */
neigh = NULL;
break;
}
neigh->alive = jiffies;
goto out_unlock;
}
}
neigh = ipoib_neigh_ctor(daddr, dev);
if (!neigh)
goto out_unlock;
/* one ref on behalf of the hash table */
atomic_inc(&neigh->refcnt);
neigh->alive = jiffies;
/* put in hash */
rcu_assign_pointer(neigh->hnext,
rcu_dereference_protected(htbl->buckets[hash_val],
lockdep_is_held(&priv->lock)));
rcu_assign_pointer(htbl->buckets[hash_val], neigh);
atomic_inc(&ntbl->entries);
out_unlock:
return neigh;
}
void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
{
/* neigh reference count was dropprd to zero */
struct net_device *dev = neigh->dev;
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct sk_buff *skb;
if (neigh->ah)
ipoib_put_ah(neigh->ah);
while ((skb = __skb_dequeue(&neigh->queue))) {
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
if (ipoib_cm_get(neigh))
ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
ipoib_dbg(ipoib_priv(dev),
"neigh free for %06x %pI6\n",
IPOIB_QPN(neigh->daddr),
neigh->daddr + 4);
kfree(neigh);
if (atomic_dec_and_test(&priv->ntbl.entries)) {
if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
complete(&priv->ntbl.flushed);
}
}
static void ipoib_neigh_reclaim(struct rcu_head *rp)
{
/* Called as a result of removal from hash table */
struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
/* note TX context may hold another ref */
ipoib_neigh_put(neigh);
}
void ipoib_neigh_free(struct ipoib_neigh *neigh)
{
struct net_device *dev = neigh->dev;
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
struct ipoib_neigh __rcu **np;
struct ipoib_neigh *n;
u32 hash_val;
htbl = rcu_dereference_protected(ntbl->htbl,
lockdep_is_held(&priv->lock));
if (!htbl)
return;
hash_val = ipoib_addr_hash(htbl, neigh->daddr);
np = &htbl->buckets[hash_val];
for (n = rcu_dereference_protected(*np,
lockdep_is_held(&priv->lock));
n != NULL;
n = rcu_dereference_protected(*np,
lockdep_is_held(&priv->lock))) {
if (n == neigh) {
/* found */
rcu_assign_pointer(*np,
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from parent list */
list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
return;
} else {
np = &n->hnext;
}
}
}
static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
{
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
struct ipoib_neigh __rcu **buckets;
u32 size;
clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
ntbl->htbl = NULL;
htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
if (!htbl)
return -ENOMEM;
size = roundup_pow_of_two(arp_tbl.gc_thresh3);
buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
if (!buckets) {
kfree(htbl);
return -ENOMEM;
}
htbl->size = size;
htbl->mask = (size - 1);
htbl->buckets = buckets;
RCU_INIT_POINTER(ntbl->htbl, htbl);
htbl->ntbl = ntbl;
atomic_set(&ntbl->entries, 0);
/* start garbage collection */
queue_delayed_work(priv->wq, &priv->neigh_reap_task,
arp_tbl.gc_interval);
return 0;
}
static void neigh_hash_free_rcu(struct rcu_head *head)
{
struct ipoib_neigh_hash *htbl = container_of(head,
struct ipoib_neigh_hash,
rcu);
struct ipoib_neigh __rcu **buckets = htbl->buckets;
struct ipoib_neigh_table *ntbl = htbl->ntbl;
kvfree(buckets);
kfree(htbl);
complete(&ntbl->deleted);
}
void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
unsigned long flags;
int i;
/* remove all neigh connected to a given path or mcast */
spin_lock_irqsave(&priv->lock, flags);
htbl = rcu_dereference_protected(ntbl->htbl,
lockdep_is_held(&priv->lock));
if (!htbl)
goto out_unlock;
for (i = 0; i < htbl->size; i++) {
struct ipoib_neigh *neigh;
struct ipoib_neigh __rcu **np = &htbl->buckets[i];
while ((neigh = rcu_dereference_protected(*np,
lockdep_is_held(&priv->lock))) != NULL) {
/* delete neighs belong to this parent */
if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
rcu_assign_pointer(*np,
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from parent list */
list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
} else {
np = &neigh->hnext;
}
}
}
out_unlock:
spin_unlock_irqrestore(&priv->lock, flags);
}
static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
{
struct ipoib_neigh_table *ntbl = &priv->ntbl;
struct ipoib_neigh_hash *htbl;
unsigned long flags;
int i, wait_flushed = 0;
init_completion(&priv->ntbl.flushed);
set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
spin_lock_irqsave(&priv->lock, flags);
htbl = rcu_dereference_protected(ntbl->htbl,
lockdep_is_held(&priv->lock));
if (!htbl)
goto out_unlock;
wait_flushed = atomic_read(&priv->ntbl.entries);
if (!wait_flushed)
goto free_htbl;
for (i = 0; i < htbl->size; i++) {
struct ipoib_neigh *neigh;
struct ipoib_neigh __rcu **np = &htbl->buckets[i];
while ((neigh = rcu_dereference_protected(*np,
lockdep_is_held(&priv->lock))) != NULL) {
rcu_assign_pointer(*np,
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from path/mc list */
list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
}
}
free_htbl:
rcu_assign_pointer(ntbl->htbl, NULL);
call_rcu(&htbl->rcu, neigh_hash_free_rcu);
out_unlock:
spin_unlock_irqrestore(&priv->lock, flags);
if (wait_flushed)
wait_for_completion(&priv->ntbl.flushed);
}
static void ipoib_neigh_hash_uninit(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "%s\n", __func__);
init_completion(&priv->ntbl.deleted);
cancel_delayed_work_sync(&priv->neigh_reap_task);
ipoib_flush_neighs(priv);
wait_for_completion(&priv->ntbl.deleted);
}
static void ipoib_napi_add(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
}
static void ipoib_napi_del(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
netif_napi_del(&priv->recv_napi);
netif_napi_del(&priv->send_napi);
}
static void ipoib_dev_uninit_default(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_transport_dev_cleanup(dev);
ipoib_napi_del(dev);
ipoib_cm_dev_cleanup(dev);
kfree(priv->rx_ring);
vfree(priv->tx_ring);
priv->rx_ring = NULL;
priv->tx_ring = NULL;
}
static int ipoib_dev_init_default(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_napi_add(dev);
/* Allocate RX/TX "rings" to hold queued skbs */
priv->rx_ring = kcalloc(ipoib_recvq_size,
sizeof(*priv->rx_ring),
GFP_KERNEL);
if (!priv->rx_ring)
goto out;
priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
sizeof(*priv->tx_ring)));
if (!priv->tx_ring) {
pr_warn("%s: failed to allocate TX ring (%d entries)\n",
priv->ca->name, ipoib_sendq_size);
goto out_rx_ring_cleanup;
}
/* priv->tx_head, tx_tail & tx_outstanding are already 0 */
if (ipoib_transport_dev_init(dev, priv->ca)) {
pr_warn("%s: ipoib_transport_dev_init failed\n",
priv->ca->name);
goto out_tx_ring_cleanup;
}
/* after qp created set dev address */
priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff;
priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
return 0;
out_tx_ring_cleanup:
vfree(priv->tx_ring);
out_rx_ring_cleanup:
kfree(priv->rx_ring);
out:
ipoib_napi_del(dev);
return -ENOMEM;
}
static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
int cmd)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if (!priv->rn_ops->ndo_do_ioctl)
return -EOPNOTSUPP;
return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
}
static int ipoib_dev_init(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int ret = -ENOMEM;
priv->qp = NULL;
/*
* the various IPoIB tasks assume they will never race against
* themselves, so always use a single thread workqueue
*/
priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
if (!priv->wq) {
pr_warn("%s: failed to allocate device WQ\n", dev->name);
goto out;
}
/* create pd, which used both for control and datapath*/
priv->pd = ib_alloc_pd(priv->ca, 0);
if (IS_ERR(priv->pd)) {
pr_warn("%s: failed to allocate PD\n", priv->ca->name);
goto clean_wq;
}
ret = priv->rn_ops->ndo_init(dev);
if (ret) {
pr_warn("%s failed to init HW resource\n", dev->name);
goto out_free_pd;
}
ret = ipoib_neigh_hash_init(priv);
if (ret) {
pr_warn("%s failed to init neigh hash\n", dev->name);
goto out_dev_uninit;
}
if (dev->flags & IFF_UP) {
if (ipoib_ib_dev_open(dev)) {
pr_warn("%s failed to open device\n", dev->name);
ret = -ENODEV;
goto out_hash_uninit;
}
}
return 0;
out_hash_uninit:
ipoib_neigh_hash_uninit(dev);
out_dev_uninit:
ipoib_ib_dev_cleanup(dev);
out_free_pd:
if (priv->pd) {
ib_dealloc_pd(priv->pd);
priv->pd = NULL;
}
clean_wq:
if (priv->wq) {
destroy_workqueue(priv->wq);
priv->wq = NULL;
}
out:
return ret;
}
/*
* This must be called before doing an unregister_netdev on a parent device to
* shutdown the IB event handler.
*/
static void ipoib_parent_unregister_pre(struct net_device *ndev)
{
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
/*
* ipoib_set_mac checks netif_running before pushing work, clearing
* running ensures the it will not add more work.
*/
rtnl_lock();
dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
rtnl_unlock();
/* ipoib_event() cannot be running once this returns */
ib_unregister_event_handler(&priv->event_handler);
/*
* Work on the queue grabs the rtnl lock, so this cannot be done while
* also holding it.
*/
flush_workqueue(ipoib_workqueue);
}
static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
{
priv->hca_caps = priv->ca->attrs.device_cap_flags;
if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
if (priv->hca_caps & IB_DEVICE_UD_TSO)
priv->dev->hw_features |= NETIF_F_TSO;
priv->dev->features |= priv->dev->hw_features;
}
}
static int ipoib_parent_init(struct net_device *ndev)
{
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
struct ib_port_attr attr;
int result;
result = ib_query_port(priv->ca, priv->port, &attr);
if (result) {
pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
priv->port);
return result;
}
priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
if (result) {
pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
priv->ca->name, priv->port, result);
return result;
}
result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
if (result) {
pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
priv->ca->name, priv->port, result);
return result;
}
memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
sizeof(union ib_gid));
SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
priv->dev->dev_port = priv->port - 1;
/* Let's set this one too for backwards compatibility. */
priv->dev->dev_id = priv->port - 1;
return 0;
}
static void ipoib_child_init(struct net_device *ndev)
{
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
priv->max_ib_mtu = ppriv->max_ib_mtu;
set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
}
static int ipoib_ndo_init(struct net_device *ndev)
{
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
int rc;
if (priv->parent) {
ipoib_child_init(ndev);
} else {
rc = ipoib_parent_init(ndev);
if (rc)
return rc;
}
/* MTU will be reset when mcast join happens */
ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
ndev->max_mtu = IPOIB_CM_MTU;
ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
/*
* Set the full membership bit, so that we join the right
* broadcast group, etc.
*/
priv->pkey |= 0x8000;
ndev->broadcast[8] = priv->pkey >> 8;
ndev->broadcast[9] = priv->pkey & 0xff;
set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
ipoib_set_dev_features(priv);
rc = ipoib_dev_init(ndev);
if (rc) {
pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
priv->ca->name, priv->dev->name, priv->port, rc);
return rc;
}
if (priv->parent) {
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
dev_hold(priv->parent);
down_write(&ppriv->vlan_rwsem);
list_add_tail(&priv->list, &ppriv->child_intfs);
up_write(&ppriv->vlan_rwsem);
}
return 0;
}
static void ipoib_ndo_uninit(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ASSERT_RTNL();
/*
* ipoib_remove_one guarantees the children are removed before the
* parent, and that is the only place where a parent can be removed.
*/
WARN_ON(!list_empty(&priv->child_intfs));
if (priv->parent) {
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
down_write(&ppriv->vlan_rwsem);
list_del(&priv->list);
up_write(&ppriv->vlan_rwsem);
}
ipoib_neigh_hash_uninit(dev);
ipoib_ib_dev_cleanup(dev);
/* no more works over the priv->wq */
if (priv->wq) {
flush_workqueue(priv->wq);
destroy_workqueue(priv->wq);
priv->wq = NULL;
}
if (priv->parent)
dev_put(priv->parent);
}
static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
}
static int ipoib_get_vf_config(struct net_device *dev, int vf,
struct ifla_vf_info *ivf)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int err;
err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
if (err)
return err;
ivf->vf = vf;
memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
return 0;
}
static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
return -EINVAL;
return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
}
static int ipoib_get_vf_stats(struct net_device *dev, int vf,
struct ifla_vf_stats *vf_stats)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
}
static const struct header_ops ipoib_header_ops = {
.create = ipoib_hard_header,
};
static const struct net_device_ops ipoib_netdev_ops_pf = {
.ndo_init = ipoib_ndo_init,
.ndo_uninit = ipoib_ndo_uninit,
.ndo_open = ipoib_open,
.ndo_stop = ipoib_stop,
.ndo_change_mtu = ipoib_change_mtu,
.ndo_fix_features = ipoib_fix_features,
.ndo_start_xmit = ipoib_start_xmit,
.ndo_tx_timeout = ipoib_timeout,
.ndo_set_rx_mode = ipoib_set_mcast_list,
.ndo_get_iflink = ipoib_get_iflink,
.ndo_set_vf_link_state = ipoib_set_vf_link_state,
.ndo_get_vf_config = ipoib_get_vf_config,
.ndo_get_vf_stats = ipoib_get_vf_stats,
.ndo_set_vf_guid = ipoib_set_vf_guid,
.ndo_set_mac_address = ipoib_set_mac,
.ndo_get_stats64 = ipoib_get_stats,
.ndo_do_ioctl = ipoib_ioctl,
};
static const struct net_device_ops ipoib_netdev_ops_vf = {
.ndo_init = ipoib_ndo_init,
.ndo_uninit = ipoib_ndo_uninit,
.ndo_open = ipoib_open,
.ndo_stop = ipoib_stop,
.ndo_change_mtu = ipoib_change_mtu,
.ndo_fix_features = ipoib_fix_features,
.ndo_start_xmit = ipoib_start_xmit,
.ndo_tx_timeout = ipoib_timeout,
.ndo_set_rx_mode = ipoib_set_mcast_list,
.ndo_get_iflink = ipoib_get_iflink,
.ndo_get_stats64 = ipoib_get_stats,
.ndo_do_ioctl = ipoib_ioctl,
};
void ipoib_setup_common(struct net_device *dev)
{
dev->header_ops = &ipoib_header_ops;
ipoib_set_ethtool_ops(dev);
dev->watchdog_timeo = HZ;
dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
dev->hard_header_len = IPOIB_HARD_LEN;
dev->addr_len = INFINIBAND_ALEN;
dev->type = ARPHRD_INFINIBAND;
dev->tx_queue_len = ipoib_sendq_size * 2;
dev->features = (NETIF_F_VLAN_CHALLENGED |
NETIF_F_HIGHDMA);
netif_keep_dst(dev);
memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
/*
* unregister_netdev always frees the netdev, we use this mode
* consistently to unify all the various unregister paths, including
* those connected to rtnl_link_ops which require it.
*/
dev->needs_free_netdev = true;
}
static void ipoib_build_priv(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
priv->dev = dev;
spin_lock_init(&priv->lock);
init_rwsem(&priv->vlan_rwsem);
mutex_init(&priv->mcast_mutex);
INIT_LIST_HEAD(&priv->path_list);
INIT_LIST_HEAD(&priv->child_intfs);
INIT_LIST_HEAD(&priv->dead_ahs);
INIT_LIST_HEAD(&priv->multicast_list);
INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
}
static const struct net_device_ops ipoib_netdev_default_pf = {
.ndo_init = ipoib_dev_init_default,
.ndo_uninit = ipoib_dev_uninit_default,
.ndo_open = ipoib_ib_dev_open_default,
.ndo_stop = ipoib_ib_dev_stop_default,
};
static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u8 port,
const char *name)
{
struct net_device *dev;
dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
NET_NAME_UNKNOWN, ipoib_setup_common);
if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
return dev;
dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
ipoib_setup_common);
if (!dev)
return ERR_PTR(-ENOMEM);
return dev;
}
int ipoib_intf_init(struct ib_device *hca, u8 port, const char *name,
struct net_device *dev)
{
struct rdma_netdev *rn = netdev_priv(dev);
struct ipoib_dev_priv *priv;
int rc;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->ca = hca;
priv->port = port;
rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
NET_NAME_UNKNOWN, ipoib_setup_common, dev);
if (rc) {
if (rc != -EOPNOTSUPP)
goto out;
dev->netdev_ops = &ipoib_netdev_default_pf;
rn->send = ipoib_send;
rn->attach_mcast = ipoib_mcast_attach;
rn->detach_mcast = ipoib_mcast_detach;
rn->hca = hca;
}
priv->rn_ops = dev->netdev_ops;
if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION)
dev->netdev_ops = &ipoib_netdev_ops_vf;
else
dev->netdev_ops = &ipoib_netdev_ops_pf;
rn->clnt_priv = priv;
/*
* Only the child register_netdev flows can handle priv_destructor
* being set, so we force it to NULL here and handle manually until it
* is safe to turn on.
*/
priv->next_priv_destructor = dev->priv_destructor;
dev->priv_destructor = NULL;
ipoib_build_priv(dev);
return 0;
out:
kfree(priv);
return rc;
}
struct net_device *ipoib_intf_alloc(struct ib_device *hca, u8 port,
const char *name)
{
struct net_device *dev;
int rc;
dev = ipoib_alloc_netdev(hca, port, name);
if (IS_ERR(dev))
return dev;
rc = ipoib_intf_init(hca, port, name, dev);
if (rc) {
free_netdev(dev);
return ERR_PTR(rc);
}
/*
* Upon success the caller must ensure ipoib_intf_free is called or
* register_netdevice succeed'd and priv_destructor is set to
* ipoib_intf_free.
*/
return dev;
}
void ipoib_intf_free(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
dev->priv_destructor = priv->next_priv_destructor;
if (dev->priv_destructor)
dev->priv_destructor(dev);
/*
* There are some error flows around register_netdev failing that may
* attempt to call priv_destructor twice, prevent that from happening.
*/
dev->priv_destructor = NULL;
/* unregister/destroy is very complicated. Make bugs more obvious. */
rn->clnt_priv = NULL;
kfree(priv);
}
static ssize_t show_pkey(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
return sprintf(buf, "0x%04x\n", priv->pkey);
}
static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
static ssize_t show_umcast(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
}
void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
{
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
if (umcast_val > 0) {
set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
ipoib_warn(priv, "ignoring multicast groups joined directly "
"by userspace\n");
} else
clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
}
static ssize_t set_umcast(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
ipoib_set_umcast(to_net_dev(dev), umcast_val);
return count;
}
static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
int ipoib_add_umcast_attr(struct net_device *dev)
{
return device_create_file(&dev->dev, &dev_attr_umcast);
}
static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
{
struct ipoib_dev_priv *child_priv;
struct net_device *netdev = priv->dev;
netif_addr_lock_bh(netdev);
memcpy(&priv->local_gid.global.interface_id,
&gid->global.interface_id,
sizeof(gid->global.interface_id));
memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
netif_addr_unlock_bh(netdev);
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
down_read(&priv->vlan_rwsem);
list_for_each_entry(child_priv, &priv->child_intfs, list)
set_base_guid(child_priv, gid);
up_read(&priv->vlan_rwsem);
}
}
static int ipoib_check_lladdr(struct net_device *dev,
struct sockaddr_storage *ss)
{
union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
int ret = 0;
netif_addr_lock_bh(dev);
/* Make sure the QPN, reserved and subnet prefix match the current
* lladdr, it also makes sure the lladdr is unicast.
*/
if (memcmp(dev->dev_addr, ss->__data,
4 + sizeof(gid->global.subnet_prefix)) ||
gid->global.interface_id == 0)
ret = -EINVAL;
netif_addr_unlock_bh(dev);
return ret;
}
static int ipoib_set_mac(struct net_device *dev, void *addr)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct sockaddr_storage *ss = addr;
int ret;
if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
return -EBUSY;
ret = ipoib_check_lladdr(dev, ss);
if (ret)
return ret;
set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
queue_work(ipoib_workqueue, &priv->flush_light);
return 0;
}
static ssize_t create_child(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int pkey;
int ret;
if (sscanf(buf, "%i", &pkey) != 1)
return -EINVAL;
if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
return -EINVAL;
ret = ipoib_vlan_add(to_net_dev(dev), pkey);
return ret ? ret : count;
}
static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
static ssize_t delete_child(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int pkey;
int ret;
if (sscanf(buf, "%i", &pkey) != 1)
return -EINVAL;
if (pkey < 0 || pkey > 0xffff)
return -EINVAL;
ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
return ret ? ret : count;
}
static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
int ipoib_add_pkey_attr(struct net_device *dev)
{
return device_create_file(&dev->dev, &dev_attr_pkey);
}
/*
* We erroneously exposed the iface's port number in the dev_id
* sysfs field long after dev_port was introduced for that purpose[1],
* and we need to stop everyone from relying on that.
* Let's overload the shower routine for the dev_id file here
* to gently bring the issue up.
*
* [1] https://www.spinics.net/lists/netdev/msg272123.html
*/
static ssize_t dev_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *ndev = to_net_dev(dev);
/*
* ndev->dev_port will be equal to 0 in old kernel prior to commit
* 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
* port numbers") Zero was chosen as special case for user space
* applications to fallback and query dev_id to check if it has
* different value or not.
*
* Don't print warning in such scenario.
*
* https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
*/
if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
netdev_info_once(ndev,
"\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
current->comm);
return sprintf(buf, "%#x\n", ndev->dev_id);
}
static DEVICE_ATTR_RO(dev_id);
static int ipoib_intercept_dev_id_attr(struct net_device *dev)
{
device_remove_file(&dev->dev, &dev_attr_dev_id);
return device_create_file(&dev->dev, &dev_attr_dev_id);
}
static struct net_device *ipoib_add_port(const char *format,
struct ib_device *hca, u8 port)
{
struct rtnl_link_ops *ops = ipoib_get_link_ops();
struct rdma_netdev_alloc_params params;
struct ipoib_dev_priv *priv;
struct net_device *ndev;
int result;
ndev = ipoib_intf_alloc(hca, port, format);
if (IS_ERR(ndev)) {
pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
PTR_ERR(ndev));
return ndev;
}
priv = ipoib_priv(ndev);
INIT_IB_EVENT_HANDLER(&priv->event_handler,
priv->ca, ipoib_event);
ib_register_event_handler(&priv->event_handler);
/* call event handler to ensure pkey in sync */
queue_work(ipoib_workqueue, &priv->flush_heavy);
result = register_netdev(ndev);
if (result) {
pr_warn("%s: couldn't register ipoib port %d; error %d\n",
hca->name, port, result);
ipoib_parent_unregister_pre(ndev);
ipoib_intf_free(ndev);
free_netdev(ndev);
return ERR_PTR(result);
}
if (hca->ops.rdma_netdev_get_params) {
int rc = hca->ops.rdma_netdev_get_params(hca, port,
RDMA_NETDEV_IPOIB,
&params);
if (!rc && ops->priv_size < params.sizeof_priv)
ops->priv_size = params.sizeof_priv;
}
/*
* We cannot set priv_destructor before register_netdev because we
* need priv to be always valid during the error flow to execute
* ipoib_parent_unregister_pre(). Instead handle it manually and only
* enter priv_destructor mode once we are completely registered.
*/
ndev->priv_destructor = ipoib_intf_free;
if (ipoib_intercept_dev_id_attr(ndev))
goto sysfs_failed;
if (ipoib_cm_add_mode_attr(ndev))
goto sysfs_failed;
if (ipoib_add_pkey_attr(ndev))
goto sysfs_failed;
if (ipoib_add_umcast_attr(ndev))
goto sysfs_failed;
if (device_create_file(&ndev->dev, &dev_attr_create_child))
goto sysfs_failed;
if (device_create_file(&ndev->dev, &dev_attr_delete_child))
goto sysfs_failed;
return ndev;
sysfs_failed:
ipoib_parent_unregister_pre(ndev);
unregister_netdev(ndev);
return ERR_PTR(-ENOMEM);
}
static void ipoib_add_one(struct ib_device *device)
{
struct list_head *dev_list;
struct net_device *dev;
struct ipoib_dev_priv *priv;
unsigned int p;
int count = 0;
dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
if (!dev_list)
return;
INIT_LIST_HEAD(dev_list);
rdma_for_each_port (device, p) {
if (!rdma_protocol_ib(device, p))
continue;
dev = ipoib_add_port("ib%d", device, p);
if (!IS_ERR(dev)) {
priv = ipoib_priv(dev);
list_add_tail(&priv->list, dev_list);
count++;
}
}
if (!count) {
kfree(dev_list);
return;
}
ib_set_client_data(device, &ipoib_client, dev_list);
}
static void ipoib_remove_one(struct ib_device *device, void *client_data)
{
struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
struct list_head *dev_list = client_data;
if (!dev_list)
return;
list_for_each_entry_safe(priv, tmp, dev_list, list) {
LIST_HEAD(head);
ipoib_parent_unregister_pre(priv->dev);
rtnl_lock();
list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
list)
unregister_netdevice_queue(cpriv->dev, &head);
unregister_netdevice_queue(priv->dev, &head);
unregister_netdevice_many(&head);
rtnl_unlock();
}
kfree(dev_list);
}
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static struct notifier_block ipoib_netdev_notifier = {
.notifier_call = ipoib_netdev_event,
};
#endif
static int __init ipoib_init_module(void)
{
int ret;
ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
#ifdef CONFIG_INFINIBAND_IPOIB_CM
ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
#endif
/*
* When copying small received packets, we only copy from the
* linear data part of the SKB, so we rely on this condition.
*/
BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
ipoib_register_debugfs();
/*
* We create a global workqueue here that is used for all flush
* operations. However, if you attempt to flush a workqueue
* from a task on that same workqueue, it deadlocks the system.
* We want to be able to flush the tasks associated with a
* specific net device, so we also create a workqueue for each
* netdevice. We queue up the tasks for that device only on
* its private workqueue, and we only queue up flush events
* on our global flush workqueue. This avoids the deadlocks.
*/
ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
if (!ipoib_workqueue) {
ret = -ENOMEM;
goto err_fs;
}
ib_sa_register_client(&ipoib_sa_client);
ret = ib_register_client(&ipoib_client);
if (ret)
goto err_sa;
ret = ipoib_netlink_init();
if (ret)
goto err_client;
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
register_netdevice_notifier(&ipoib_netdev_notifier);
#endif
return 0;
err_client:
ib_unregister_client(&ipoib_client);
err_sa:
ib_sa_unregister_client(&ipoib_sa_client);
destroy_workqueue(ipoib_workqueue);
err_fs:
ipoib_unregister_debugfs();
return ret;
}
static void __exit ipoib_cleanup_module(void)
{
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
unregister_netdevice_notifier(&ipoib_netdev_notifier);
#endif
ipoib_netlink_fini();
ib_unregister_client(&ipoib_client);
ib_sa_unregister_client(&ipoib_sa_client);
ipoib_unregister_debugfs();
destroy_workqueue(ipoib_workqueue);
}
module_init(ipoib_init_module);
module_exit(ipoib_cleanup_module);
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