/* Instead of increasing this, you should create a hash table. */
#define MAX_GRO_SKBS 8
+/* This should be increased if a protocol with a bigger head is added. */
+#define GRO_MAX_HEAD (MAX_HEADER + 128)
+
/*
* The list of packet types we will receive (as opposed to discard)
* and the routines to invoke.
static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
static struct list_head ptype_all __read_mostly; /* Taps */
-#ifdef CONFIG_NET_DMA
-struct net_dma {
- struct dma_client client;
- spinlock_t lock;
- cpumask_t channel_mask;
- struct dma_chan **channels;
-};
-
-static enum dma_state_client
-netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
- enum dma_state state);
-
-static struct net_dma net_dma = {
- .client = {
- .event_callback = netdev_dma_event,
- },
-};
-#endif
-
/*
* The @dev_base_head list is protected by @dev_base_lock and the rtnl
* semaphore.
ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
- ARPHRD_VOID, ARPHRD_NONE};
+ ARPHRD_PHONET_PIPE, ARPHRD_VOID, ARPHRD_NONE};
static const char *netdev_lock_name[] =
{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
"_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
"_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
"_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
- "_xmit_VOID", "_xmit_NONE"};
+ "_xmit_PHONET_PIPE", "_xmit_VOID", "_xmit_NONE"};
static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
dev->flags |= IFF_UP;
/*
+ * Enable NET_DMA
+ */
+ net_dmaengine_get();
+
+ /*
* Initialize multicasting status
*/
dev_set_rx_mode(dev);
*/
call_netdevice_notifiers(NETDEV_DOWN, dev);
+ /*
+ * Shutdown NET_DMA
+ */
+ net_dmaengine_put();
+
return 0;
}
((features & NETIF_F_IP_CSUM) &&
protocol == htons(ETH_P_IP)) ||
((features & NETIF_F_IPV6_CSUM) &&
- protocol == htons(ETH_P_IPV6)));
+ protocol == htons(ETH_P_IPV6)) ||
+ ((features & NETIF_F_FCOE_CRC) &&
+ protocol == htons(ETH_P_FCOE)));
}
static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
skb->mac_len = skb->network_header - skb->mac_header;
__skb_pull(skb, skb->mac_len);
- if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
+ if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
+ struct net_device *dev = skb->dev;
+ struct ethtool_drvinfo info = {};
+
+ if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
+ dev->ethtool_ops->get_drvinfo(dev, &info);
+
+ WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
+ "ip_summed=%d",
+ info.driver, dev ? dev->features : 0L,
+ skb->sk ? skb->sk->sk_route_caps : 0L,
+ skb->len, skb->data_len, skb->ip_summed);
+
if (skb_header_cloned(skb) &&
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
return ERR_PTR(err);
struct netdev_queue *txq)
{
const struct net_device_ops *ops = dev->netdev_ops;
+ int rc;
- prefetch(&dev->netdev_ops->ndo_start_xmit);
if (likely(!skb->next)) {
if (!list_empty(&ptype_all))
dev_queue_xmit_nit(skb, dev);
goto gso;
}
- return ops->ndo_start_xmit(skb, dev);
+ rc = ops->ndo_start_xmit(skb, dev);
+ /*
+ * TODO: if skb_orphan() was called by
+ * dev->hard_start_xmit() (for example, the unmodified
+ * igb driver does that; bnx2 doesn't), then
+ * skb_tx_software_timestamp() will be unable to send
+ * back the time stamp.
+ *
+ * How can this be prevented? Always create another
+ * reference to the socket before calling
+ * dev->hard_start_xmit()? Prevent that skb_orphan()
+ * does anything in dev->hard_start_xmit() by clearing
+ * the skb destructor before the call and restoring it
+ * afterwards, then doing the skb_orphan() ourselves?
+ */
+ return rc;
}
gso:
do {
struct sk_buff *nskb = skb->next;
- int rc;
skb->next = nskb->next;
nskb->next = NULL;
return 0;
}
-static u32 simple_tx_hashrnd;
-static int simple_tx_hashrnd_initialized = 0;
+static u32 skb_tx_hashrnd;
-static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
+u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
{
- u32 addr1, addr2, ports;
- u32 hash, ihl;
- u8 ip_proto = 0;
-
- if (unlikely(!simple_tx_hashrnd_initialized)) {
- get_random_bytes(&simple_tx_hashrnd, 4);
- simple_tx_hashrnd_initialized = 1;
- }
+ u32 hash;
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
- ip_proto = ip_hdr(skb)->protocol;
- addr1 = ip_hdr(skb)->saddr;
- addr2 = ip_hdr(skb)->daddr;
- ihl = ip_hdr(skb)->ihl;
- break;
- case htons(ETH_P_IPV6):
- ip_proto = ipv6_hdr(skb)->nexthdr;
- addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
- addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
- ihl = (40 >> 2);
- break;
- default:
- return 0;
- }
-
-
- switch (ip_proto) {
- case IPPROTO_TCP:
- case IPPROTO_UDP:
- case IPPROTO_DCCP:
- case IPPROTO_ESP:
- case IPPROTO_AH:
- case IPPROTO_SCTP:
- case IPPROTO_UDPLITE:
- ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
- break;
-
- default:
- ports = 0;
- break;
- }
+ if (skb_rx_queue_recorded(skb)) {
+ hash = skb_get_rx_queue(skb);
+ } else if (skb->sk && skb->sk->sk_hash) {
+ hash = skb->sk->sk_hash;
+ } else
+ hash = skb->protocol;
- hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);
+ hash = jhash_1word(hash, skb_tx_hashrnd);
return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
}
+EXPORT_SYMBOL(skb_tx_hash);
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
struct sk_buff *skb)
if (ops->ndo_select_queue)
queue_index = ops->ndo_select_queue(dev, skb);
else if (dev->real_num_tx_queues > 1)
- queue_index = simple_tx_hash(dev, skb);
+ queue_index = skb_tx_hash(dev, skb);
skb_set_queue_mapping(skb, queue_index);
return netdev_get_tx_queue(dev, queue_index);
rcu_read_lock();
- /* Don't receive packets in an exiting network namespace */
- if (!net_alive(dev_net(skb->dev))) {
- kfree_skb(skb);
- goto out;
- }
-
#ifdef CONFIG_NET_CLS_ACT
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
if (!skb)
goto out;
+ skb_orphan(skb);
+
type = skb->protocol;
list_for_each_entry_rcu(ptype,
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
int err = -ENOENT;
- if (!skb_shinfo(skb)->frag_list)
+ if (NAPI_GRO_CB(skb)->count == 1)
goto out;
rcu_read_lock();
}
out:
- __skb_push(skb, -skb_network_offset(skb));
+ skb_shinfo(skb)->gso_size = 0;
return netif_receive_skb(skb);
}
napi_gro_complete(skb);
}
+ napi->gro_count = 0;
napi->gro_list = NULL;
}
EXPORT_SYMBOL(napi_gro_flush);
-int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+void *skb_gro_header(struct sk_buff *skb, unsigned int hlen)
+{
+ unsigned int offset = skb_gro_offset(skb);
+
+ hlen += offset;
+ if (hlen <= skb_headlen(skb))
+ return skb->data + offset;
+
+ if (unlikely(!skb_shinfo(skb)->nr_frags ||
+ skb_shinfo(skb)->frags[0].size <=
+ hlen - skb_headlen(skb) ||
+ PageHighMem(skb_shinfo(skb)->frags[0].page)))
+ return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
+
+ return page_address(skb_shinfo(skb)->frags[0].page) +
+ skb_shinfo(skb)->frags[0].page_offset +
+ offset - skb_headlen(skb);
+}
+EXPORT_SYMBOL(skb_gro_header);
+
+int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff **pp = NULL;
struct packet_type *ptype;
__be16 type = skb->protocol;
struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
- int count = 0;
+ int same_flow;
int mac_len;
+ int ret;
if (!(skb->dev->features & NETIF_F_GRO))
goto normal;
+ if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
+ goto normal;
+
rcu_read_lock();
list_for_each_entry_rcu(ptype, head, list) {
- struct sk_buff *p;
-
if (ptype->type != type || ptype->dev || !ptype->gro_receive)
continue;
- skb_reset_network_header(skb);
+ skb_set_network_header(skb, skb_gro_offset(skb));
mac_len = skb->network_header - skb->mac_header;
skb->mac_len = mac_len;
NAPI_GRO_CB(skb)->same_flow = 0;
NAPI_GRO_CB(skb)->flush = 0;
-
- for (p = napi->gro_list; p; p = p->next) {
- count++;
- NAPI_GRO_CB(p)->same_flow =
- p->mac_len == mac_len &&
- !memcmp(skb_mac_header(p), skb_mac_header(skb),
- mac_len);
- NAPI_GRO_CB(p)->flush = 0;
- }
+ NAPI_GRO_CB(skb)->free = 0;
pp = ptype->gro_receive(&napi->gro_list, skb);
break;
if (&ptype->list == head)
goto normal;
+ same_flow = NAPI_GRO_CB(skb)->same_flow;
+ ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
+
if (pp) {
struct sk_buff *nskb = *pp;
*pp = nskb->next;
nskb->next = NULL;
napi_gro_complete(nskb);
- count--;
+ napi->gro_count--;
}
- if (NAPI_GRO_CB(skb)->same_flow)
+ if (same_flow)
goto ok;
- if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) {
- __skb_push(skb, -skb_network_offset(skb));
+ if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
goto normal;
- }
+ napi->gro_count++;
NAPI_GRO_CB(skb)->count = 1;
+ skb_shinfo(skb)->gso_size = skb_gro_len(skb);
skb->next = napi->gro_list;
napi->gro_list = skb;
+ ret = GRO_HELD;
+
+pull:
+ if (unlikely(!pskb_may_pull(skb, skb_gro_offset(skb)))) {
+ if (napi->gro_list == skb)
+ napi->gro_list = skb->next;
+ ret = GRO_DROP;
+ }
ok:
- return NET_RX_SUCCESS;
+ return ret;
normal:
- return netif_receive_skb(skb);
+ ret = GRO_NORMAL;
+ goto pull;
+}
+EXPORT_SYMBOL(dev_gro_receive);
+
+static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+{
+ struct sk_buff *p;
+
+ if (netpoll_rx_on(skb))
+ return GRO_NORMAL;
+
+ for (p = napi->gro_list; p; p = p->next) {
+ NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev)
+ && !compare_ether_header(skb_mac_header(p),
+ skb_gro_mac_header(skb));
+ NAPI_GRO_CB(p)->flush = 0;
+ }
+
+ return dev_gro_receive(napi, skb);
+}
+
+int napi_skb_finish(int ret, struct sk_buff *skb)
+{
+ int err = NET_RX_SUCCESS;
+
+ switch (ret) {
+ case GRO_NORMAL:
+ return netif_receive_skb(skb);
+
+ case GRO_DROP:
+ err = NET_RX_DROP;
+ /* fall through */
+
+ case GRO_MERGED_FREE:
+ kfree_skb(skb);
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(napi_skb_finish);
+
+int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+{
+ skb_gro_reset_offset(skb);
+
+ return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
}
EXPORT_SYMBOL(napi_gro_receive);
+void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
+{
+ __skb_pull(skb, skb_headlen(skb));
+ skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
+
+ napi->skb = skb;
+}
+EXPORT_SYMBOL(napi_reuse_skb);
+
+struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
+ struct napi_gro_fraginfo *info)
+{
+ struct net_device *dev = napi->dev;
+ struct sk_buff *skb = napi->skb;
+ struct ethhdr *eth;
+ skb_frag_t *frag;
+ int i;
+
+ napi->skb = NULL;
+
+ if (!skb) {
+ skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
+ if (!skb)
+ goto out;
+
+ skb_reserve(skb, NET_IP_ALIGN);
+ }
+
+ BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
+ frag = &info->frags[info->nr_frags - 1];
+
+ for (i = skb_shinfo(skb)->nr_frags; i < info->nr_frags; i++) {
+ skb_fill_page_desc(skb, i, frag->page, frag->page_offset,
+ frag->size);
+ frag++;
+ }
+ skb_shinfo(skb)->nr_frags = info->nr_frags;
+
+ skb->data_len = info->len;
+ skb->len += info->len;
+ skb->truesize += info->len;
+
+ skb_reset_mac_header(skb);
+ skb_gro_reset_offset(skb);
+
+ eth = skb_gro_header(skb, sizeof(*eth));
+ if (!eth) {
+ napi_reuse_skb(napi, skb);
+ skb = NULL;
+ goto out;
+ }
+
+ skb_gro_pull(skb, sizeof(*eth));
+
+ /*
+ * This works because the only protocols we care about don't require
+ * special handling. We'll fix it up properly at the end.
+ */
+ skb->protocol = eth->h_proto;
+
+ skb->ip_summed = info->ip_summed;
+ skb->csum = info->csum;
+
+out:
+ return skb;
+}
+EXPORT_SYMBOL(napi_fraginfo_skb);
+
+int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
+{
+ int err = NET_RX_SUCCESS;
+
+ switch (ret) {
+ case GRO_NORMAL:
+ case GRO_HELD:
+ skb->protocol = eth_type_trans(skb, napi->dev);
+
+ if (ret == GRO_NORMAL)
+ return netif_receive_skb(skb);
+
+ skb_gro_pull(skb, -ETH_HLEN);
+ break;
+
+ case GRO_DROP:
+ err = NET_RX_DROP;
+ /* fall through */
+
+ case GRO_MERGED_FREE:
+ napi_reuse_skb(napi, skb);
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(napi_frags_finish);
+
+int napi_gro_frags(struct napi_struct *napi, struct napi_gro_fraginfo *info)
+{
+ struct sk_buff *skb = napi_fraginfo_skb(napi, info);
+
+ if (!skb)
+ return NET_RX_DROP;
+
+ return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
+}
+EXPORT_SYMBOL(napi_gro_frags);
+
static int process_backlog(struct napi_struct *napi, int quota)
{
int work = 0;
}
local_irq_enable();
- napi_gro_receive(napi, skb);
+ netif_receive_skb(skb);
} while (++work < quota && jiffies == start_time);
- napi_gro_flush(napi);
-
return work;
}
int (*poll)(struct napi_struct *, int), int weight)
{
INIT_LIST_HEAD(&napi->poll_list);
+ napi->gro_count = 0;
napi->gro_list = NULL;
+ napi->skb = NULL;
napi->poll = poll;
napi->weight = weight;
list_add(&napi->dev_list, &dev->napi_list);
-#ifdef CONFIG_NETPOLL
napi->dev = dev;
+#ifdef CONFIG_NETPOLL
spin_lock_init(&napi->poll_lock);
napi->poll_owner = -1;
#endif
{
struct sk_buff *skb, *next;
- list_del(&napi->dev_list);
+ list_del_init(&napi->dev_list);
+ kfree_skb(napi->skb);
for (skb = napi->gro_list; skb; skb = next) {
next = skb->next;
}
napi->gro_list = NULL;
+ napi->gro_count = 0;
}
EXPORT_SYMBOL(netif_napi_del);
* There may not be any more sk_buffs coming right now, so push
* any pending DMA copies to hardware
*/
- if (!cpus_empty(net_dma.channel_mask)) {
- int chan_idx;
- for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
- struct dma_chan *chan = net_dma.channels[chan_idx];
- if (chan)
- dma_async_memcpy_issue_pending(chan);
- }
- }
+ dma_issue_pending_all();
#endif
return;
static int __dev_set_promiscuity(struct net_device *dev, int inc)
{
unsigned short old_flags = dev->flags;
+ uid_t uid;
+ gid_t gid;
ASSERT_RTNL();
printk(KERN_INFO "device %s %s promiscuous mode\n",
dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
"left");
- if (audit_enabled)
+ if (audit_enabled) {
+ current_uid_gid(&uid, &gid);
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_ANOM_PROMISCUOUS,
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
dev->name, (dev->flags & IFF_PROMISC),
(old_flags & IFF_PROMISC),
audit_get_loginuid(current),
- current->uid, current->gid,
+ uid, gid,
audit_get_sessionid(current));
+ }
dev_change_rx_flags(dev, IFF_PROMISC);
}
{
int err;
struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
- const struct net_device_ops *ops = dev->netdev_ops;
+ const struct net_device_ops *ops;
if (!dev)
return -ENODEV;
+ ops = dev->netdev_ops;
+
switch (cmd) {
case SIOCSIFFLAGS: /* Set interface flags */
return dev_change_flags(dev, ifr->ifr_flags);
cmd == SIOCSMIIREG ||
cmd == SIOCBRADDIF ||
cmd == SIOCBRDELIF ||
+ cmd == SIOCSHWTSTAMP ||
cmd == SIOCWANDEV) {
err = -EOPNOTSUPP;
if (ops->ndo_do_ioctl) {
case SIOCBONDCHANGEACTIVE:
case SIOCBRADDIF:
case SIOCBRDELIF:
+ case SIOCSHWTSTAMP:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* fall through */
}
EXPORT_SYMBOL(netdev_fix_features);
+/* Some devices need to (re-)set their netdev_ops inside
+ * ->init() or similar. If that happens, we have to setup
+ * the compat pointers again.
+ */
+void netdev_resync_ops(struct net_device *dev)
+{
+#ifdef CONFIG_COMPAT_NET_DEV_OPS
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ dev->init = ops->ndo_init;
+ dev->uninit = ops->ndo_uninit;
+ dev->open = ops->ndo_open;
+ dev->change_rx_flags = ops->ndo_change_rx_flags;
+ dev->set_rx_mode = ops->ndo_set_rx_mode;
+ dev->set_multicast_list = ops->ndo_set_multicast_list;
+ dev->set_mac_address = ops->ndo_set_mac_address;
+ dev->validate_addr = ops->ndo_validate_addr;
+ dev->do_ioctl = ops->ndo_do_ioctl;
+ dev->set_config = ops->ndo_set_config;
+ dev->change_mtu = ops->ndo_change_mtu;
+ dev->neigh_setup = ops->ndo_neigh_setup;
+ dev->tx_timeout = ops->ndo_tx_timeout;
+ dev->get_stats = ops->ndo_get_stats;
+ dev->vlan_rx_register = ops->ndo_vlan_rx_register;
+ dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
+ dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ dev->poll_controller = ops->ndo_poll_controller;
+#endif
+#endif
+}
+EXPORT_SYMBOL(netdev_resync_ops);
+
/**
* register_netdevice - register a network device
* @dev: device to register
* This is temporary until all network devices are converted.
*/
if (dev->netdev_ops) {
- const struct net_device_ops *ops = dev->netdev_ops;
-
- dev->init = ops->ndo_init;
- dev->uninit = ops->ndo_uninit;
- dev->open = ops->ndo_open;
- dev->change_rx_flags = ops->ndo_change_rx_flags;
- dev->set_rx_mode = ops->ndo_set_rx_mode;
- dev->set_multicast_list = ops->ndo_set_multicast_list;
- dev->set_mac_address = ops->ndo_set_mac_address;
- dev->validate_addr = ops->ndo_validate_addr;
- dev->do_ioctl = ops->ndo_do_ioctl;
- dev->set_config = ops->ndo_set_config;
- dev->change_mtu = ops->ndo_change_mtu;
- dev->tx_timeout = ops->ndo_tx_timeout;
- dev->get_stats = ops->ndo_get_stats;
- dev->vlan_rx_register = ops->ndo_vlan_rx_register;
- dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
- dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
-#ifdef CONFIG_NET_POLL_CONTROLLER
- dev->poll_controller = ops->ndo_poll_controller;
-#endif
+ netdev_resync_ops(dev);
} else {
char drivername[64];
pr_info("%s (%s): not using net_device_ops yet\n",
}
/**
+ * init_dummy_netdev - init a dummy network device for NAPI
+ * @dev: device to init
+ *
+ * This takes a network device structure and initialize the minimum
+ * amount of fields so it can be used to schedule NAPI polls without
+ * registering a full blown interface. This is to be used by drivers
+ * that need to tie several hardware interfaces to a single NAPI
+ * poll scheduler due to HW limitations.
+ */
+int init_dummy_netdev(struct net_device *dev)
+{
+ /* Clear everything. Note we don't initialize spinlocks
+ * are they aren't supposed to be taken by any of the
+ * NAPI code and this dummy netdev is supposed to be
+ * only ever used for NAPI polls
+ */
+ memset(dev, 0, sizeof(struct net_device));
+
+ /* make sure we BUG if trying to hit standard
+ * register/unregister code path
+ */
+ dev->reg_state = NETREG_DUMMY;
+
+ /* initialize the ref count */
+ atomic_set(&dev->refcnt, 1);
+
+ /* NAPI wants this */
+ INIT_LIST_HEAD(&dev->napi_list);
+
+ /* a dummy interface is started by default */
+ set_bit(__LINK_STATE_PRESENT, &dev->state);
+ set_bit(__LINK_STATE_START, &dev->state);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(init_dummy_netdev);
+
+
+/**
* register_netdev - register a network device
* @dev: device to register
*
return NOTIFY_OK;
}
-#ifdef CONFIG_NET_DMA
-/**
- * net_dma_rebalance - try to maintain one DMA channel per CPU
- * @net_dma: DMA client and associated data (lock, channels, channel_mask)
- *
- * This is called when the number of channels allocated to the net_dma client
- * changes. The net_dma client tries to have one DMA channel per CPU.
- */
-
-static void net_dma_rebalance(struct net_dma *net_dma)
-{
- unsigned int cpu, i, n, chan_idx;
- struct dma_chan *chan;
-
- if (cpus_empty(net_dma->channel_mask)) {
- for_each_online_cpu(cpu)
- rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
- return;
- }
-
- i = 0;
- cpu = first_cpu(cpu_online_map);
-
- for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
- chan = net_dma->channels[chan_idx];
-
- n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
- + (i < (num_online_cpus() %
- cpus_weight(net_dma->channel_mask)) ? 1 : 0));
-
- while(n) {
- per_cpu(softnet_data, cpu).net_dma = chan;
- cpu = next_cpu(cpu, cpu_online_map);
- n--;
- }
- i++;
- }
-}
-
-/**
- * netdev_dma_event - event callback for the net_dma_client
- * @client: should always be net_dma_client
- * @chan: DMA channel for the event
- * @state: DMA state to be handled
- */
-static enum dma_state_client
-netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
- enum dma_state state)
-{
- int i, found = 0, pos = -1;
- struct net_dma *net_dma =
- container_of(client, struct net_dma, client);
- enum dma_state_client ack = DMA_DUP; /* default: take no action */
-
- spin_lock(&net_dma->lock);
- switch (state) {
- case DMA_RESOURCE_AVAILABLE:
- for (i = 0; i < nr_cpu_ids; i++)
- if (net_dma->channels[i] == chan) {
- found = 1;
- break;
- } else if (net_dma->channels[i] == NULL && pos < 0)
- pos = i;
-
- if (!found && pos >= 0) {
- ack = DMA_ACK;
- net_dma->channels[pos] = chan;
- cpu_set(pos, net_dma->channel_mask);
- net_dma_rebalance(net_dma);
- }
- break;
- case DMA_RESOURCE_REMOVED:
- for (i = 0; i < nr_cpu_ids; i++)
- if (net_dma->channels[i] == chan) {
- found = 1;
- pos = i;
- break;
- }
-
- if (found) {
- ack = DMA_ACK;
- cpu_clear(pos, net_dma->channel_mask);
- net_dma->channels[i] = NULL;
- net_dma_rebalance(net_dma);
- }
- break;
- default:
- break;
- }
- spin_unlock(&net_dma->lock);
-
- return ack;
-}
-
-/**
- * netdev_dma_register - register the networking subsystem as a DMA client
- */
-static int __init netdev_dma_register(void)
-{
- net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
- GFP_KERNEL);
- if (unlikely(!net_dma.channels)) {
- printk(KERN_NOTICE
- "netdev_dma: no memory for net_dma.channels\n");
- return -ENOMEM;
- }
- spin_lock_init(&net_dma.lock);
- dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
- dma_async_client_register(&net_dma.client);
- dma_async_client_chan_request(&net_dma.client);
- return 0;
-}
-
-#else
-static int __init netdev_dma_register(void) { return -ENODEV; }
-#endif /* CONFIG_NET_DMA */
/**
* netdev_increment_features - increment feature set by one
static void __net_exit default_device_exit(struct net *net)
{
- struct net_device *dev, *next;
+ struct net_device *dev;
/*
* Push all migratable of the network devices back to the
* initial network namespace
*/
rtnl_lock();
- for_each_netdev_safe(net, dev, next) {
+restart:
+ for_each_netdev(net, dev) {
int err;
char fb_name[IFNAMSIZ];
/* Delete virtual devices */
if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
dev->rtnl_link_ops->dellink(dev);
- continue;
+ goto restart;
}
/* Push remaing network devices to init_net */
__func__, dev->name, err);
BUG();
}
+ goto restart;
}
rtnl_unlock();
}
queue->backlog.poll = process_backlog;
queue->backlog.weight = weight_p;
queue->backlog.gro_list = NULL;
+ queue->backlog.gro_count = 0;
}
dev_boot_phase = 0;
if (register_pernet_device(&default_device_ops))
goto out;
- netdev_dma_register();
-
open_softirq(NET_TX_SOFTIRQ, net_tx_action);
open_softirq(NET_RX_SOFTIRQ, net_rx_action);
subsys_initcall(net_dev_init);
+static int __init initialize_hashrnd(void)
+{
+ get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd));
+ return 0;
+}
+
+late_initcall_sync(initialize_hashrnd);
+
EXPORT_SYMBOL(__dev_get_by_index);
EXPORT_SYMBOL(__dev_get_by_name);
EXPORT_SYMBOL(__dev_remove_pack);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff