1
linux/drivers/infiniband/ulp/ipoib/ipoib_main.c
Roland Dreier 1993d683f3 [IPoIB] Drop RX packets when out of memory
Change the way IPoIB handles RX packets when it can't allocate a new
receive skbuff.  If the allocation of a new receive skb fails, we now
drop the packet we just received and repost the original receive skb.
This means that the receive ring always stays full and we don't have
to monkey around with trying to schedule a refill task for later.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
2005-10-28 15:30:34 -07:00

1120 lines
27 KiB
C

/*
* 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.
*
* $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
*/
#include "ipoib.h"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/if_arp.h> /* For ARPHRD_xxx */
#include <linux/ip.h>
#include <linux/in.h>
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
MODULE_LICENSE("Dual BSD/GPL");
#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
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;
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device);
static struct ib_client ipoib_client = {
.name = "ipoib",
.add = ipoib_add_one,
.remove = ipoib_remove_one
};
int ipoib_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
ipoib_dbg(priv, "bringing up interface\n");
set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
if (ipoib_pkey_dev_delay_open(dev))
return 0;
if (ipoib_ib_dev_open(dev))
return -EINVAL;
if (ipoib_ib_dev_up(dev))
return -EINVAL;
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
struct ipoib_dev_priv *cpriv;
/* Bring up any child interfaces too */
down(&priv->vlan_mutex);
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);
}
up(&priv->vlan_mutex);
}
netif_start_queue(dev);
return 0;
}
static int ipoib_stop(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_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(&priv->vlan_mutex);
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);
}
up(&priv->vlan_mutex);
}
return 0;
}
static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
return -EINVAL;
priv->admin_mtu = new_mtu;
dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
return 0;
}
static struct ipoib_path *__path_find(struct net_device *dev,
union ib_gid *gid)
{
struct ipoib_dev_priv *priv = netdev_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->raw, 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 = netdev_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 ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_neigh *neigh, *tn;
struct sk_buff *skb;
unsigned long flags;
while ((skb = __skb_dequeue(&path->queue)))
dev_kfree_skb_irq(skb);
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
/*
* It's safe to call ipoib_put_ah() inside priv->lock
* here, because we know that path->ah will always
* hold one more reference, so ipoib_put_ah() will
* never do more than decrement the ref count.
*/
if (neigh->ah)
ipoib_put_ah(neigh->ah);
*to_ipoib_neigh(neigh->neighbour) = NULL;
neigh->neighbour->ops->destructor = NULL;
kfree(neigh);
}
spin_unlock_irqrestore(&priv->lock, flags);
if (path->ah)
ipoib_put_ah(path->ah);
kfree(path);
}
void ipoib_flush_paths(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_path *path, *tp;
LIST_HEAD(remove_list);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
list_splice(&priv->path_list, &remove_list);
INIT_LIST_HEAD(&priv->path_list);
list_for_each_entry(path, &remove_list, list)
rb_erase(&path->rb_node, &priv->path_tree);
spin_unlock_irqrestore(&priv->lock, flags);
list_for_each_entry_safe(path, tp, &remove_list, list) {
if (path->query)
ib_sa_cancel_query(path->query_id, path->query);
wait_for_completion(&path->done);
path_free(dev, path);
}
}
static void path_rec_completion(int status,
struct ib_sa_path_rec *pathrec,
void *path_ptr)
{
struct ipoib_path *path = path_ptr;
struct net_device *dev = path->dev;
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_ah *ah = NULL;
struct ipoib_neigh *neigh;
struct sk_buff_head skqueue;
struct sk_buff *skb;
unsigned long flags;
if (pathrec)
ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
else
ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
status, IPOIB_GID_ARG(path->pathrec.dgid));
skb_queue_head_init(&skqueue);
if (!status) {
struct ib_ah_attr av = {
.dlid = be16_to_cpu(pathrec->dlid),
.sl = pathrec->sl,
.port_num = priv->port
};
int path_rate = ib_sa_rate_enum_to_int(pathrec->rate);
if (path_rate > 0 && priv->local_rate > path_rate)
av.static_rate = (priv->local_rate - 1) / path_rate;
ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n",
av.static_rate, priv->local_rate,
ib_sa_rate_enum_to_int(pathrec->rate));
ah = ipoib_create_ah(dev, priv->pd, &av);
}
spin_lock_irqsave(&priv->lock, flags);
path->ah = ah;
if (ah) {
path->pathrec = *pathrec;
ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
while ((skb = __skb_dequeue(&path->queue)))
__skb_queue_tail(&skqueue, skb);
list_for_each_entry(neigh, &path->neigh_list, list) {
kref_get(&path->ah->ref);
neigh->ah = path->ah;
while ((skb = __skb_dequeue(&neigh->queue)))
__skb_queue_tail(&skqueue, skb);
}
} else
path->query = NULL;
complete(&path->done);
spin_unlock_irqrestore(&priv->lock, flags);
while ((skb = __skb_dequeue(&skqueue))) {
skb->dev = dev;
if (dev_queue_xmit(skb))
ipoib_warn(priv, "dev_queue_xmit failed "
"to requeue packet\n");
}
}
static struct ipoib_path *path_rec_create(struct net_device *dev,
union ib_gid *gid)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_path *path;
path = kmalloc(sizeof *path, GFP_ATOMIC);
if (!path)
return NULL;
path->dev = dev;
path->pathrec.dlid = 0;
path->ah = NULL;
skb_queue_head_init(&path->queue);
INIT_LIST_HEAD(&path->neigh_list);
path->query = NULL;
init_completion(&path->done);
memcpy(path->pathrec.dgid.raw, gid->raw, sizeof (union ib_gid));
path->pathrec.sgid = priv->local_gid;
path->pathrec.pkey = cpu_to_be16(priv->pkey);
path->pathrec.numb_path = 1;
return path;
}
static int path_rec_start(struct net_device *dev,
struct ipoib_path *path)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
IPOIB_GID_ARG(path->pathrec.dgid));
path->query_id =
ib_sa_path_rec_get(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_PKEY,
1000, GFP_ATOMIC,
path_rec_completion,
path, &path->query);
if (path->query_id < 0) {
ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
path->query = NULL;
return path->query_id;
}
return 0;
}
static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_path *path;
struct ipoib_neigh *neigh;
neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
if (!neigh) {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
return;
}
skb_queue_head_init(&neigh->queue);
neigh->neighbour = skb->dst->neighbour;
*to_ipoib_neigh(skb->dst->neighbour) = neigh;
/*
* We can only be called from ipoib_start_xmit, so we're
* inside tx_lock -- no need to save/restore flags.
*/
spin_lock(&priv->lock);
path = __path_find(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4));
if (!path) {
path = path_rec_create(dev,
(union ib_gid *) (skb->dst->neighbour->ha + 4));
if (!path)
goto err;
__path_add(dev, path);
}
list_add_tail(&neigh->list, &path->neigh_list);
if (path->pathrec.dlid) {
kref_get(&path->ah->ref);
neigh->ah = path->ah;
ipoib_send(dev, skb, path->ah,
be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
} else {
neigh->ah = NULL;
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
__skb_queue_tail(&neigh->queue, skb);
} else {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
if (!path->query && path_rec_start(dev, path))
goto err;
}
spin_unlock(&priv->lock);
return;
err:
*to_ipoib_neigh(skb->dst->neighbour) = NULL;
list_del(&neigh->list);
neigh->neighbour->ops->destructor = NULL;
kfree(neigh);
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
spin_unlock(&priv->lock);
}
static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
/* Look up path record for unicasts */
if (skb->dst->neighbour->ha[4] != 0xff) {
neigh_add_path(skb, dev);
return;
}
/* Add in the P_Key for multicasts */
skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
ipoib_mcast_send(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4), skb);
}
static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
struct ipoib_pseudoheader *phdr)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_path *path;
/*
* We can only be called from ipoib_start_xmit, so we're
* inside tx_lock -- no need to save/restore flags.
*/
spin_lock(&priv->lock);
path = __path_find(dev, (union ib_gid *) (phdr->hwaddr + 4));
if (!path) {
path = path_rec_create(dev,
(union ib_gid *) (phdr->hwaddr + 4));
if (path) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof *phdr);
__skb_queue_tail(&path->queue, skb);
if (path_rec_start(dev, path)) {
spin_unlock(&priv->lock);
path_free(dev, path);
return;
} else
__path_add(dev, path);
} else {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
spin_unlock(&priv->lock);
return;
}
if (path->pathrec.dlid) {
ipoib_dbg(priv, "Send unicast ARP to %04x\n",
be16_to_cpu(path->pathrec.dlid));
ipoib_send(dev, skb, path->ah,
be32_to_cpup((__be32 *) phdr->hwaddr));
} else if ((path->query || !path_rec_start(dev, path)) &&
skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof *phdr);
__skb_queue_tail(&path->queue, skb);
} else {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
spin_unlock(&priv->lock);
}
static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_neigh *neigh;
unsigned long flags;
local_irq_save(flags);
if (!spin_trylock(&priv->tx_lock)) {
local_irq_restore(flags);
return NETDEV_TX_LOCKED;
}
/*
* Check if our queue is stopped. Since we have the LLTX bit
* set, we can't rely on netif_stop_queue() preventing our
* xmit function from being called with a full queue.
*/
if (unlikely(netif_queue_stopped(dev))) {
spin_unlock_irqrestore(&priv->tx_lock, flags);
return NETDEV_TX_BUSY;
}
if (skb->dst && skb->dst->neighbour) {
if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
ipoib_path_lookup(skb, dev);
goto out;
}
neigh = *to_ipoib_neigh(skb->dst->neighbour);
if (likely(neigh->ah)) {
ipoib_send(dev, skb, neigh->ah,
be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
goto out;
}
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
spin_lock(&priv->lock);
__skb_queue_tail(&neigh->queue, skb);
spin_unlock(&priv->lock);
} else {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
} else {
struct ipoib_pseudoheader *phdr =
(struct ipoib_pseudoheader *) skb->data;
skb_pull(skb, sizeof *phdr);
if (phdr->hwaddr[4] == 0xff) {
/* Add in the P_Key for multicast*/
phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
phdr->hwaddr[9] = priv->pkey & 0xff;
ipoib_mcast_send(dev, (union ib_gid *) (phdr->hwaddr + 4), skb);
} else {
/* unicast GID -- should be ARP or RARP reply */
if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
(be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
IPOIB_GID_FMT "\n",
skb->dst ? "neigh" : "dst",
be16_to_cpup((__be16 *) skb->data),
be32_to_cpup((__be32 *) phdr->hwaddr),
IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
dev_kfree_skb_any(skb);
++priv->stats.tx_dropped;
goto out;
}
unicast_arp_send(skb, dev, phdr);
}
}
out:
spin_unlock_irqrestore(&priv->tx_lock, flags);
return NETDEV_TX_OK;
}
static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
return &priv->stats;
}
static void ipoib_timeout(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
jiffies_to_msecs(jiffies - dev->trans_start));
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,
void *daddr, void *saddr, unsigned len)
{
struct ipoib_header *header;
header = (struct ipoib_header *) skb_push(skb, sizeof *header);
header->proto = htons(type);
header->reserved = 0;
/*
* If we don't have a neighbour structure, stuff the
* destination address onto the front of the skb so we can
* figure out where to send the packet later.
*/
if (!skb->dst || !skb->dst->neighbour) {
struct ipoib_pseudoheader *phdr =
(struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
}
return 0;
}
static void ipoib_set_mcast_list(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
queue_work(ipoib_workqueue, &priv->restart_task);
}
static void ipoib_neigh_destructor(struct neighbour *n)
{
struct ipoib_neigh *neigh;
struct ipoib_dev_priv *priv = netdev_priv(n->dev);
unsigned long flags;
struct ipoib_ah *ah = NULL;
ipoib_dbg(priv,
"neigh_destructor for %06x " IPOIB_GID_FMT "\n",
be32_to_cpup((__be32 *) n->ha),
IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
spin_lock_irqsave(&priv->lock, flags);
neigh = *to_ipoib_neigh(n);
if (neigh) {
if (neigh->ah)
ah = neigh->ah;
list_del(&neigh->list);
*to_ipoib_neigh(n) = NULL;
kfree(neigh);
}
spin_unlock_irqrestore(&priv->lock, flags);
if (ah)
ipoib_put_ah(ah);
}
static int ipoib_neigh_setup(struct neighbour *neigh)
{
/*
* Is this kosher? I can't find anybody in the kernel that
* sets neigh->destructor, so we should be able to set it here
* without trouble.
*/
neigh->ops->destructor = ipoib_neigh_destructor;
return 0;
}
static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
{
parms->neigh_setup = ipoib_neigh_setup;
return 0;
}
int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
/* Allocate RX/TX "rings" to hold queued skbs */
priv->rx_ring = kmalloc(IPOIB_RX_RING_SIZE * sizeof (struct ipoib_rx_buf),
GFP_KERNEL);
if (!priv->rx_ring) {
printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
ca->name, IPOIB_RX_RING_SIZE);
goto out;
}
memset(priv->rx_ring, 0,
IPOIB_RX_RING_SIZE * sizeof (struct ipoib_rx_buf));
priv->tx_ring = kmalloc(IPOIB_TX_RING_SIZE * sizeof (struct ipoib_tx_buf),
GFP_KERNEL);
if (!priv->tx_ring) {
printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
ca->name, IPOIB_TX_RING_SIZE);
goto out_rx_ring_cleanup;
}
memset(priv->tx_ring, 0,
IPOIB_TX_RING_SIZE * sizeof (struct ipoib_tx_buf));
/* priv->tx_head & tx_tail are already 0 */
if (ipoib_ib_dev_init(dev, ca, port))
goto out_tx_ring_cleanup;
return 0;
out_tx_ring_cleanup:
kfree(priv->tx_ring);
out_rx_ring_cleanup:
kfree(priv->rx_ring);
out:
return -ENOMEM;
}
void ipoib_dev_cleanup(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
ipoib_delete_debug_file(dev);
/* Delete any child interfaces first */
list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
unregister_netdev(cpriv->dev);
ipoib_dev_cleanup(cpriv->dev);
free_netdev(cpriv->dev);
}
ipoib_ib_dev_cleanup(dev);
kfree(priv->rx_ring);
kfree(priv->tx_ring);
priv->rx_ring = NULL;
priv->tx_ring = NULL;
}
static void ipoib_setup(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
dev->open = ipoib_open;
dev->stop = ipoib_stop;
dev->change_mtu = ipoib_change_mtu;
dev->hard_start_xmit = ipoib_start_xmit;
dev->get_stats = ipoib_get_stats;
dev->tx_timeout = ipoib_timeout;
dev->hard_header = ipoib_hard_header;
dev->set_multicast_list = ipoib_set_mcast_list;
dev->neigh_setup = ipoib_neigh_setup_dev;
dev->watchdog_timeo = HZ;
dev->rebuild_header = NULL;
dev->set_mac_address = NULL;
dev->header_cache_update = NULL;
dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
/*
* We add in INFINIBAND_ALEN to allow for the destination
* address "pseudoheader" for skbs without neighbour struct.
*/
dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
dev->addr_len = INFINIBAND_ALEN;
dev->type = ARPHRD_INFINIBAND;
dev->tx_queue_len = IPOIB_TX_RING_SIZE * 2;
dev->features = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
/* MTU will be reset when mcast join happens */
dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
priv->mcast_mtu = priv->admin_mtu = dev->mtu;
memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
netif_carrier_off(dev);
SET_MODULE_OWNER(dev);
priv->dev = dev;
spin_lock_init(&priv->lock);
spin_lock_init(&priv->tx_lock);
init_MUTEX(&priv->mcast_mutex);
init_MUTEX(&priv->vlan_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_WORK(&priv->pkey_task, ipoib_pkey_poll, priv->dev);
INIT_WORK(&priv->mcast_task, ipoib_mcast_join_task, priv->dev);
INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush, priv->dev);
INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah, priv->dev);
}
struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
{
struct net_device *dev;
dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
ipoib_setup);
if (!dev)
return NULL;
return netdev_priv(dev);
}
static ssize_t show_pkey(struct class_device *cdev, char *buf)
{
struct ipoib_dev_priv *priv =
netdev_priv(container_of(cdev, struct net_device, class_dev));
return sprintf(buf, "0x%04x\n", priv->pkey);
}
static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
static ssize_t create_child(struct class_device *cdev,
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;
/*
* Set the full membership bit, so that we join the right
* broadcast group, etc.
*/
pkey |= 0x8000;
ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
pkey);
return ret ? ret : count;
}
static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
static ssize_t delete_child(struct class_device *cdev,
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(container_of(cdev, struct net_device, class_dev),
pkey);
return ret ? ret : count;
}
static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
int ipoib_add_pkey_attr(struct net_device *dev)
{
return class_device_create_file(&dev->class_dev,
&class_device_attr_pkey);
}
static struct net_device *ipoib_add_port(const char *format,
struct ib_device *hca, u8 port)
{
struct ipoib_dev_priv *priv;
int result = -ENOMEM;
priv = ipoib_intf_alloc(format);
if (!priv)
goto alloc_mem_failed;
SET_NETDEV_DEV(priv->dev, hca->dma_device);
result = ib_query_pkey(hca, port, 0, &priv->pkey);
if (result) {
printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
hca->name, port, result);
goto alloc_mem_failed;
}
/*
* Set the full membership bit, so that we join the right
* broadcast group, etc.
*/
priv->pkey |= 0x8000;
priv->dev->broadcast[8] = priv->pkey >> 8;
priv->dev->broadcast[9] = priv->pkey & 0xff;
result = ib_query_gid(hca, port, 0, &priv->local_gid);
if (result) {
printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
hca->name, port, result);
goto alloc_mem_failed;
} else
memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
result = ipoib_dev_init(priv->dev, hca, port);
if (result < 0) {
printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
hca->name, port, result);
goto device_init_failed;
}
INIT_IB_EVENT_HANDLER(&priv->event_handler,
priv->ca, ipoib_event);
result = ib_register_event_handler(&priv->event_handler);
if (result < 0) {
printk(KERN_WARNING "%s: ib_register_event_handler failed for "
"port %d (ret = %d)\n",
hca->name, port, result);
goto event_failed;
}
result = register_netdev(priv->dev);
if (result) {
printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
hca->name, port, result);
goto register_failed;
}
if (ipoib_create_debug_file(priv->dev))
goto debug_failed;
if (ipoib_add_pkey_attr(priv->dev))
goto sysfs_failed;
if (class_device_create_file(&priv->dev->class_dev,
&class_device_attr_create_child))
goto sysfs_failed;
if (class_device_create_file(&priv->dev->class_dev,
&class_device_attr_delete_child))
goto sysfs_failed;
return priv->dev;
sysfs_failed:
ipoib_delete_debug_file(priv->dev);
debug_failed:
unregister_netdev(priv->dev);
register_failed:
ib_unregister_event_handler(&priv->event_handler);
flush_scheduled_work();
event_failed:
ipoib_dev_cleanup(priv->dev);
device_init_failed:
free_netdev(priv->dev);
alloc_mem_failed:
return ERR_PTR(result);
}
static void ipoib_add_one(struct ib_device *device)
{
struct list_head *dev_list;
struct net_device *dev;
struct ipoib_dev_priv *priv;
int s, e, p;
dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
if (!dev_list)
return;
INIT_LIST_HEAD(dev_list);
if (device->node_type == IB_NODE_SWITCH) {
s = 0;
e = 0;
} else {
s = 1;
e = device->phys_port_cnt;
}
for (p = s; p <= e; ++p) {
dev = ipoib_add_port("ib%d", device, p);
if (!IS_ERR(dev)) {
priv = netdev_priv(dev);
list_add_tail(&priv->list, dev_list);
}
}
ib_set_client_data(device, &ipoib_client, dev_list);
}
static void ipoib_remove_one(struct ib_device *device)
{
struct ipoib_dev_priv *priv, *tmp;
struct list_head *dev_list;
dev_list = ib_get_client_data(device, &ipoib_client);
list_for_each_entry_safe(priv, tmp, dev_list, list) {
ib_unregister_event_handler(&priv->event_handler);
flush_scheduled_work();
unregister_netdev(priv->dev);
ipoib_dev_cleanup(priv->dev);
free_netdev(priv->dev);
}
kfree(dev_list);
}
static int __init ipoib_init_module(void)
{
int ret;
ret = ipoib_register_debugfs();
if (ret)
return ret;
/*
* We create our own workqueue mainly because we want to be
* able to flush it when devices are being removed. We can't
* use schedule_work()/flush_scheduled_work() because both
* unregister_netdev() and linkwatch_event take the rtnl lock,
* so flush_scheduled_work() can deadlock during device
* removal.
*/
ipoib_workqueue = create_singlethread_workqueue("ipoib");
if (!ipoib_workqueue) {
ret = -ENOMEM;
goto err_fs;
}
ret = ib_register_client(&ipoib_client);
if (ret)
goto err_wq;
return 0;
err_wq:
destroy_workqueue(ipoib_workqueue);
err_fs:
ipoib_unregister_debugfs();
return ret;
}
static void __exit ipoib_cleanup_module(void)
{
ib_unregister_client(&ipoib_client);
ipoib_unregister_debugfs();
destroy_workqueue(ipoib_workqueue);
}
module_init(ipoib_init_module);
module_exit(ipoib_cleanup_module);