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-rw-r--r--net/core/netpoll.c360
1 files changed, 181 insertions, 179 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index ead5920c26d..823215d8e90 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -34,18 +34,12 @@
#define MAX_UDP_CHUNK 1460
#define MAX_SKBS 32
#define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
-#define MAX_RETRIES 20000
-static DEFINE_SPINLOCK(skb_list_lock);
-static int nr_skbs;
-static struct sk_buff *skbs;
-
-static DEFINE_SPINLOCK(queue_lock);
-static int queue_depth;
-static struct sk_buff *queue_head, *queue_tail;
+static struct sk_buff_head skb_pool;
static atomic_t trapped;
+#define USEC_PER_POLL 50
#define NETPOLL_RX_ENABLED 1
#define NETPOLL_RX_DROP 2
@@ -56,54 +50,41 @@ static atomic_t trapped;
static void zap_completion_queue(void);
static void arp_reply(struct sk_buff *skb);
-static void queue_process(void *p)
+static void queue_process(struct work_struct *work)
{
- unsigned long flags;
+ struct netpoll_info *npinfo =
+ container_of(work, struct netpoll_info, tx_work.work);
struct sk_buff *skb;
-
- while (queue_head) {
- spin_lock_irqsave(&queue_lock, flags);
-
- skb = queue_head;
- queue_head = skb->next;
- if (skb == queue_tail)
- queue_head = NULL;
-
- queue_depth--;
-
- spin_unlock_irqrestore(&queue_lock, flags);
-
- dev_queue_xmit(skb);
- }
-}
-
-static DECLARE_WORK(send_queue, queue_process, NULL);
-
-void netpoll_queue(struct sk_buff *skb)
-{
unsigned long flags;
- if (queue_depth == MAX_QUEUE_DEPTH) {
- __kfree_skb(skb);
- return;
- }
+ while ((skb = skb_dequeue(&npinfo->txq))) {
+ struct net_device *dev = skb->dev;
- spin_lock_irqsave(&queue_lock, flags);
- if (!queue_head)
- queue_head = skb;
- else
- queue_tail->next = skb;
- queue_tail = skb;
- queue_depth++;
- spin_unlock_irqrestore(&queue_lock, flags);
+ if (!netif_device_present(dev) || !netif_running(dev)) {
+ __kfree_skb(skb);
+ continue;
+ }
- schedule_work(&send_queue);
+ local_irq_save(flags);
+ netif_tx_lock(dev);
+ if (netif_queue_stopped(dev) ||
+ dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
+ skb_queue_head(&npinfo->txq, skb);
+ netif_tx_unlock(dev);
+ local_irq_restore(flags);
+
+ schedule_delayed_work(&npinfo->tx_work, HZ/10);
+ return;
+ }
+ netif_tx_unlock(dev);
+ local_irq_restore(flags);
+ }
}
-static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
- unsigned short ulen, u32 saddr, u32 daddr)
+static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
+ unsigned short ulen, __be32 saddr, __be32 daddr)
{
- unsigned int psum;
+ __wsum psum;
if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY)
return 0;
@@ -111,7 +92,7 @@ static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
if (skb->ip_summed == CHECKSUM_COMPLETE &&
- !(u16)csum_fold(csum_add(psum, skb->csum)))
+ !csum_fold(csum_add(psum, skb->csum)))
return 0;
skb->csum = psum;
@@ -167,12 +148,11 @@ static void service_arp_queue(struct netpoll_info *npi)
arp_reply(skb);
skb = skb_dequeue(&npi->arp_tx);
}
- return;
}
void netpoll_poll(struct netpoll *np)
{
- if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
+ if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
return;
/* Process pending work on NIC */
@@ -190,17 +170,15 @@ static void refill_skbs(void)
struct sk_buff *skb;
unsigned long flags;
- spin_lock_irqsave(&skb_list_lock, flags);
- while (nr_skbs < MAX_SKBS) {
+ spin_lock_irqsave(&skb_pool.lock, flags);
+ while (skb_pool.qlen < MAX_SKBS) {
skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
if (!skb)
break;
- skb->next = skbs;
- skbs = skb;
- nr_skbs++;
+ __skb_queue_tail(&skb_pool, skb);
}
- spin_unlock_irqrestore(&skb_list_lock, flags);
+ spin_unlock_irqrestore(&skb_pool.lock, flags);
}
static void zap_completion_queue(void)
@@ -219,7 +197,7 @@ static void zap_completion_queue(void)
while (clist != NULL) {
struct sk_buff *skb = clist;
clist = clist->next;
- if(skb->destructor)
+ if (skb->destructor)
dev_kfree_skb_any(skb); /* put this one back */
else
__kfree_skb(skb);
@@ -229,38 +207,25 @@ static void zap_completion_queue(void)
put_cpu_var(softnet_data);
}
-static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve)
+static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
{
- int once = 1, count = 0;
- unsigned long flags;
- struct sk_buff *skb = NULL;
+ int count = 0;
+ struct sk_buff *skb;
zap_completion_queue();
+ refill_skbs();
repeat:
- if (nr_skbs < MAX_SKBS)
- refill_skbs();
skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb)
+ skb = skb_dequeue(&skb_pool);
if (!skb) {
- spin_lock_irqsave(&skb_list_lock, flags);
- skb = skbs;
- if (skb) {
- skbs = skb->next;
- skb->next = NULL;
- nr_skbs--;
- }
- spin_unlock_irqrestore(&skb_list_lock, flags);
- }
-
- if(!skb) {
- count++;
- if (once && (count == 1000000)) {
- printk("out of netpoll skbs!\n");
- once = 0;
+ if (++count < 10) {
+ netpoll_poll(np);
+ goto repeat;
}
- netpoll_poll(np);
- goto repeat;
+ return NULL;
}
atomic_set(&skb->users, 1);
@@ -270,50 +235,46 @@ repeat:
static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
{
- int status;
- struct netpoll_info *npinfo;
-
- if (!np || !np->dev || !netif_running(np->dev)) {
- __kfree_skb(skb);
- return;
- }
+ int status = NETDEV_TX_BUSY;
+ unsigned long tries;
+ struct net_device *dev = np->dev;
+ struct netpoll_info *npinfo = np->dev->npinfo;
- npinfo = np->dev->npinfo;
+ if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
+ __kfree_skb(skb);
+ return;
+ }
- /* avoid recursion */
- if (npinfo->poll_owner == smp_processor_id() ||
- np->dev->xmit_lock_owner == smp_processor_id()) {
- if (np->drop)
- np->drop(skb);
- else
- __kfree_skb(skb);
- return;
- }
+ /* don't get messages out of order, and no recursion */
+ if (skb_queue_len(&npinfo->txq) == 0 &&
+ npinfo->poll_owner != smp_processor_id()) {
+ unsigned long flags;
- do {
- npinfo->tries--;
- netif_tx_lock(np->dev);
+ local_irq_save(flags);
+ if (netif_tx_trylock(dev)) {
+ /* try until next clock tick */
+ for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
+ tries > 0; --tries) {
+ if (!netif_queue_stopped(dev))
+ status = dev->hard_start_xmit(skb, dev);
- /*
- * network drivers do not expect to be called if the queue is
- * stopped.
- */
- status = NETDEV_TX_BUSY;
- if (!netif_queue_stopped(np->dev))
- status = np->dev->hard_start_xmit(skb, np->dev);
+ if (status == NETDEV_TX_OK)
+ break;
- netif_tx_unlock(np->dev);
+ /* tickle device maybe there is some cleanup */
+ netpoll_poll(np);
- /* success */
- if(!status) {
- npinfo->tries = MAX_RETRIES; /* reset */
- return;
+ udelay(USEC_PER_POLL);
+ }
+ netif_tx_unlock(dev);
}
+ local_irq_restore(flags);
+ }
- /* transmit busy */
- netpoll_poll(np);
- udelay(50);
- } while (npinfo->tries > 0);
+ if (status != NETDEV_TX_OK) {
+ skb_queue_tail(&npinfo->txq, skb);
+ schedule_delayed_work(&npinfo->tx_work,0);
+ }
}
void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
@@ -335,13 +296,19 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
memcpy(skb->data, msg, len);
skb->len += len;
- udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
+ skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
udph->source = htons(np->local_port);
udph->dest = htons(np->remote_port);
udph->len = htons(udp_len);
udph->check = 0;
+ udph->check = csum_tcpudp_magic(htonl(np->local_ip),
+ htonl(np->remote_ip),
+ udp_len, IPPROTO_UDP,
+ csum_partial((unsigned char *)udph, udp_len, 0));
+ if (udph->check == 0)
+ udph->check = CSUM_MANGLED_0;
- iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
+ skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
/* iph->version = 4; iph->ihl = 5; */
put_unaligned(0x45, (unsigned char *)iph);
@@ -357,8 +324,8 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
-
- eth->h_proto = htons(ETH_P_IP);
+ skb->mac.raw = skb->data;
+ skb->protocol = eth->h_proto = htons(ETH_P_IP);
memcpy(eth->h_source, np->local_mac, 6);
memcpy(eth->h_dest, np->remote_mac, 6);
@@ -373,7 +340,8 @@ static void arp_reply(struct sk_buff *skb)
struct arphdr *arp;
unsigned char *arp_ptr;
int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
- u32 sip, tip;
+ __be32 sip, tip;
+ unsigned char *sha;
struct sk_buff *send_skb;
struct netpoll *np = NULL;
@@ -400,9 +368,14 @@ static void arp_reply(struct sk_buff *skb)
arp->ar_op != htons(ARPOP_REQUEST))
return;
- arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len;
+ arp_ptr = (unsigned char *)(arp+1);
+ /* save the location of the src hw addr */
+ sha = arp_ptr;
+ arp_ptr += skb->dev->addr_len;
memcpy(&sip, arp_ptr, 4);
- arp_ptr += 4 + skb->dev->addr_len;
+ arp_ptr += 4;
+ /* if we actually cared about dst hw addr, it would get copied here */
+ arp_ptr += skb->dev->addr_len;
memcpy(&tip, arp_ptr, 4);
/* Should we ignore arp? */
@@ -425,8 +398,8 @@ static void arp_reply(struct sk_buff *skb)
if (np->dev->hard_header &&
np->dev->hard_header(send_skb, skb->dev, ptype,
- np->remote_mac, np->local_mac,
- send_skb->len) < 0) {
+ sha, np->local_mac,
+ send_skb->len) < 0) {
kfree_skb(send_skb);
return;
}
@@ -449,7 +422,7 @@ static void arp_reply(struct sk_buff *skb)
arp_ptr += np->dev->addr_len;
memcpy(arp_ptr, &tip, 4);
arp_ptr += 4;
- memcpy(arp_ptr, np->remote_mac, np->dev->addr_len);
+ memcpy(arp_ptr, sha, np->dev->addr_len);
arp_ptr += np->dev->addr_len;
memcpy(arp_ptr, &sip, 4);
@@ -464,7 +437,6 @@ int __netpoll_rx(struct sk_buff *skb)
struct netpoll_info *npi = skb->dev->npinfo;
struct netpoll *np = npi->rx_np;
-
if (!np)
goto out;
if (skb->dev->type != ARPHRD_ETHER)
@@ -537,47 +509,47 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
{
char *cur=opt, *delim;
- if(*cur != '@') {
+ if (*cur != '@') {
if ((delim = strchr(cur, '@')) == NULL)
goto parse_failed;
- *delim=0;
- np->local_port=simple_strtol(cur, NULL, 10);
- cur=delim;
+ *delim = 0;
+ np->local_port = simple_strtol(cur, NULL, 10);
+ cur = delim;
}
cur++;
printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
- if(*cur != '/') {
+ if (*cur != '/') {
if ((delim = strchr(cur, '/')) == NULL)
goto parse_failed;
- *delim=0;
- np->local_ip=ntohl(in_aton(cur));
- cur=delim;
+ *delim = 0;
+ np->local_ip = ntohl(in_aton(cur));
+ cur = delim;
printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
np->name, HIPQUAD(np->local_ip));
}
cur++;
- if ( *cur != ',') {
+ if (*cur != ',') {
/* parse out dev name */
if ((delim = strchr(cur, ',')) == NULL)
goto parse_failed;
- *delim=0;
+ *delim = 0;
strlcpy(np->dev_name, cur, sizeof(np->dev_name));
- cur=delim;
+ cur = delim;
}
cur++;
printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
- if ( *cur != '@' ) {
+ if (*cur != '@') {
/* dst port */
if ((delim = strchr(cur, '@')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_port=simple_strtol(cur, NULL, 10);
- cur=delim;
+ *delim = 0;
+ np->remote_port = simple_strtol(cur, NULL, 10);
+ cur = delim;
}
cur++;
printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
@@ -585,42 +557,41 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
/* dst ip */
if ((delim = strchr(cur, '/')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_ip=ntohl(in_aton(cur));
- cur=delim+1;
+ *delim = 0;
+ np->remote_ip = ntohl(in_aton(cur));
+ cur = delim + 1;
printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
- np->name, HIPQUAD(np->remote_ip));
+ np->name, HIPQUAD(np->remote_ip));
- if( *cur != 0 )
- {
+ if (*cur != 0) {
/* MAC address */
if ((delim = strchr(cur, ':')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_mac[0]=simple_strtol(cur, NULL, 16);
- cur=delim+1;
+ *delim = 0;
+ np->remote_mac[0] = simple_strtol(cur, NULL, 16);
+ cur = delim + 1;
if ((delim = strchr(cur, ':')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_mac[1]=simple_strtol(cur, NULL, 16);
- cur=delim+1;
+ *delim = 0;
+ np->remote_mac[1] = simple_strtol(cur, NULL, 16);
+ cur = delim + 1;
if ((delim = strchr(cur, ':')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_mac[2]=simple_strtol(cur, NULL, 16);
- cur=delim+1;
+ *delim = 0;
+ np->remote_mac[2] = simple_strtol(cur, NULL, 16);
+ cur = delim + 1;
if ((delim = strchr(cur, ':')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_mac[3]=simple_strtol(cur, NULL, 16);
- cur=delim+1;
+ *delim = 0;
+ np->remote_mac[3] = simple_strtol(cur, NULL, 16);
+ cur = delim + 1;
if ((delim = strchr(cur, ':')) == NULL)
goto parse_failed;
- *delim=0;
- np->remote_mac[4]=simple_strtol(cur, NULL, 16);
- cur=delim+1;
- np->remote_mac[5]=simple_strtol(cur, NULL, 16);
+ *delim = 0;
+ np->remote_mac[4] = simple_strtol(cur, NULL, 16);
+ cur = delim + 1;
+ np->remote_mac[5] = simple_strtol(cur, NULL, 16);
}
printk(KERN_INFO "%s: remote ethernet address "
@@ -647,34 +618,44 @@ int netpoll_setup(struct netpoll *np)
struct in_device *in_dev;
struct netpoll_info *npinfo;
unsigned long flags;
+ int err;
if (np->dev_name)
ndev = dev_get_by_name(np->dev_name);
if (!ndev) {
printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
np->name, np->dev_name);
- return -1;
+ return -ENODEV;
}
np->dev = ndev;
if (!ndev->npinfo) {
npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
- if (!npinfo)
+ if (!npinfo) {
+ err = -ENOMEM;
goto release;
+ }
npinfo->rx_flags = 0;
npinfo->rx_np = NULL;
spin_lock_init(&npinfo->poll_lock);
npinfo->poll_owner = -1;
- npinfo->tries = MAX_RETRIES;
+
spin_lock_init(&npinfo->rx_lock);
skb_queue_head_init(&npinfo->arp_tx);
- } else
+ skb_queue_head_init(&npinfo->txq);
+ INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
+
+ atomic_set(&npinfo->refcnt, 1);
+ } else {
npinfo = ndev->npinfo;
+ atomic_inc(&npinfo->refcnt);
+ }
if (!ndev->poll_controller) {
printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
np->name, np->dev_name);
+ err = -ENOTSUPP;
goto release;
}
@@ -685,13 +666,14 @@ int netpoll_setup(struct netpoll *np)
np->name, np->dev_name);
rtnl_lock();
- if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
+ err = dev_open(ndev);
+ rtnl_unlock();
+
+ if (err) {
printk(KERN_ERR "%s: failed to open %s\n",
- np->name, np->dev_name);
- rtnl_unlock();
+ np->name, ndev->name);
goto release;
}
- rtnl_unlock();
atleast = jiffies + HZ/10;
atmost = jiffies + 4*HZ;
@@ -729,6 +711,7 @@ int netpoll_setup(struct netpoll *np)
rcu_read_unlock();
printk(KERN_ERR "%s: no IP address for %s, aborting\n",
np->name, np->dev_name);
+ err = -EDESTADDRREQ;
goto release;
}
@@ -761,8 +744,15 @@ int netpoll_setup(struct netpoll *np)
kfree(npinfo);
np->dev = NULL;
dev_put(ndev);
- return -1;
+ return err;
+}
+
+static int __init netpoll_init(void)
+{
+ skb_queue_head_init(&skb_pool);
+ return 0;
}
+core_initcall(netpoll_init);
void netpoll_cleanup(struct netpoll *np)
{
@@ -771,12 +761,25 @@ void netpoll_cleanup(struct netpoll *np)
if (np->dev) {
npinfo = np->dev->npinfo;
- if (npinfo && npinfo->rx_np == np) {
- spin_lock_irqsave(&npinfo->rx_lock, flags);
- npinfo->rx_np = NULL;
- npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
- spin_unlock_irqrestore(&npinfo->rx_lock, flags);
+ if (npinfo) {
+ if (npinfo->rx_np == np) {
+ spin_lock_irqsave(&npinfo->rx_lock, flags);
+ npinfo->rx_np = NULL;
+ npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
+ spin_unlock_irqrestore(&npinfo->rx_lock, flags);
+ }
+
+ np->dev->npinfo = NULL;
+ if (atomic_dec_and_test(&npinfo->refcnt)) {
+ skb_queue_purge(&npinfo->arp_tx);
+ skb_queue_purge(&npinfo->txq);
+ cancel_rearming_delayed_work(&npinfo->tx_work);
+ flush_scheduled_work();
+
+ kfree(npinfo);
+ }
}
+
dev_put(np->dev);
}
@@ -803,4 +806,3 @@ EXPORT_SYMBOL(netpoll_setup);
EXPORT_SYMBOL(netpoll_cleanup);
EXPORT_SYMBOL(netpoll_send_udp);
EXPORT_SYMBOL(netpoll_poll);
-EXPORT_SYMBOL(netpoll_queue);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-25 20:34:41 +0000