af_iucv: change net_device handling for HS transport
This patch saves the net_device in the iucv_sock structure during
bind in order to fasten skb sending.
In addition some other small improvements are made for HS transport:
- error checking when sending skbs
- locking changes in afiucv_hs_callback_txnotify
- skb freeing in afiucv_hs_callback_txnotify
And finally it contains code cleanup to get rid of iucv_skb_queue_purge.
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index ef6ab71..fbce4a3 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -131,17 +131,6 @@
memcpy(&dst[8], src, 8);
}
-static void iucv_skb_queue_purge(struct sk_buff_head *list)
-{
- struct sk_buff *skb;
-
- while ((skb = skb_dequeue(list)) != NULL) {
- if (skb->dev)
- dev_put(skb->dev);
- kfree_skb(skb);
- }
-}
-
static int afiucv_pm_prepare(struct device *dev)
{
#ifdef CONFIG_PM_DEBUG
@@ -176,7 +165,7 @@
read_lock(&iucv_sk_list.lock);
sk_for_each(sk, node, &iucv_sk_list.head) {
iucv = iucv_sk(sk);
- iucv_skb_queue_purge(&iucv->send_skb_q);
+ skb_queue_purge(&iucv->send_skb_q);
skb_queue_purge(&iucv->backlog_skb_q);
switch (sk->sk_state) {
case IUCV_DISCONN:
@@ -337,7 +326,6 @@
static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
struct sk_buff *skb, u8 flags)
{
- struct net *net = sock_net(sock);
struct iucv_sock *iucv = iucv_sk(sock);
struct af_iucv_trans_hdr *phs_hdr;
struct sk_buff *nskb;
@@ -374,10 +362,10 @@
if (imsg)
memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
- skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if);
+ skb->dev = iucv->hs_dev;
if (!skb->dev)
return -ENODEV;
- if (!(skb->dev->flags & IFF_UP))
+ if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
return -ENETDOWN;
if (skb->len > skb->dev->mtu) {
if (sock->sk_type == SOCK_SEQPACKET)
@@ -392,15 +380,14 @@
return -ENOMEM;
skb_queue_tail(&iucv->send_skb_q, nskb);
err = dev_queue_xmit(skb);
- if (err) {
+ if (net_xmit_eval(err)) {
skb_unlink(nskb, &iucv->send_skb_q);
- dev_put(nskb->dev);
kfree_skb(nskb);
} else {
atomic_sub(confirm_recv, &iucv->msg_recv);
WARN_ON(atomic_read(&iucv->msg_recv) < 0);
}
- return err;
+ return net_xmit_eval(err);
}
static struct sock *__iucv_get_sock_by_name(char *nm)
@@ -471,7 +458,8 @@
{
struct iucv_sock *iucv = iucv_sk(sk);
unsigned long timeo;
- int err, blen;
+ int err = 0;
+ int blen;
struct sk_buff *skb;
lock_sock(sk);
@@ -498,7 +486,7 @@
sk->sk_state = IUCV_CLOSING;
sk->sk_state_change(sk);
- if (!skb_queue_empty(&iucv->send_skb_q)) {
+ if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
timeo = sk->sk_lingertime;
else
@@ -515,13 +503,19 @@
sk->sk_err = ECONNRESET;
sk->sk_state_change(sk);
- iucv_skb_queue_purge(&iucv->send_skb_q);
+ skb_queue_purge(&iucv->send_skb_q);
skb_queue_purge(&iucv->backlog_skb_q);
default: /* fall through */
iucv_sever_path(sk, 1);
}
+ if (iucv->hs_dev) {
+ dev_put(iucv->hs_dev);
+ iucv->hs_dev = NULL;
+ sk->sk_bound_dev_if = 0;
+ }
+
/* mark socket for deletion by iucv_sock_kill() */
sock_set_flag(sk, SOCK_ZAPPED);
@@ -713,7 +707,6 @@
goto done_unlock;
/* Bind the socket */
-
if (pr_iucv)
if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
goto vm_bind; /* VM IUCV transport */
@@ -727,6 +720,8 @@
memcpy(iucv->src_name, sa->siucv_name, 8);
memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
sk->sk_bound_dev_if = dev->ifindex;
+ iucv->hs_dev = dev;
+ dev_hold(dev);
sk->sk_state = IUCV_BOUND;
iucv->transport = AF_IUCV_TRANS_HIPER;
if (!iucv->msglimit)
@@ -1128,8 +1123,10 @@
noblock, &err);
else
skb = sock_alloc_send_skb(sk, len, noblock, &err);
- if (!skb)
+ if (!skb) {
+ err = -ENOMEM;
goto out;
+ }
if (iucv->transport == AF_IUCV_TRANS_HIPER)
skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
@@ -1152,6 +1149,7 @@
/* increment and save iucv message tag for msg_completion cbk */
txmsg.tag = iucv->send_tag++;
memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
+
if (iucv->transport == AF_IUCV_TRANS_HIPER) {
atomic_inc(&iucv->msg_sent);
err = afiucv_hs_send(&txmsg, sk, skb, 0);
@@ -1206,8 +1204,6 @@
return len;
fail:
- if (skb->dev)
- dev_put(skb->dev);
kfree_skb(skb);
out:
release_sock(sk);
@@ -1400,7 +1396,14 @@
}
kfree_skb(skb);
- atomic_inc(&iucv->msg_recv);
+ if (iucv->transport == AF_IUCV_TRANS_HIPER) {
+ atomic_inc(&iucv->msg_recv);
+ if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
+ WARN_ON(1);
+ iucv_sock_close(sk);
+ return -EFAULT;
+ }
+ }
/* Queue backlog skbs */
spin_lock_bh(&iucv->message_q.lock);
@@ -1957,6 +1960,8 @@
memcpy(niucv->src_name, iucv->src_name, 8);
memcpy(niucv->src_user_id, iucv->src_user_id, 8);
nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
+ niucv->hs_dev = iucv->hs_dev;
+ dev_hold(niucv->hs_dev);
afiucv_swap_src_dest(skb);
trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
trans_hdr->window = niucv->msglimit;
@@ -2025,12 +2030,15 @@
struct iucv_sock *iucv = iucv_sk(sk);
/* other end of connection closed */
- if (iucv) {
- bh_lock_sock(sk);
+ if (!iucv)
+ goto out;
+ bh_lock_sock(sk);
+ if (sk->sk_state == IUCV_CONNECTED) {
sk->sk_state = IUCV_DISCONN;
sk->sk_state_change(sk);
- bh_unlock_sock(sk);
}
+ bh_unlock_sock(sk);
+out:
kfree_skb(skb);
return NET_RX_SUCCESS;
}
@@ -2175,11 +2183,11 @@
break;
case (AF_IUCV_FLAG_WIN):
err = afiucv_hs_callback_win(sk, skb);
- if (skb->len > sizeof(struct af_iucv_trans_hdr))
- err = afiucv_hs_callback_rx(sk, skb);
- else
- kfree(skb);
- break;
+ if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
+ kfree_skb(skb);
+ break;
+ }
+ /* fall through */
case 0:
/* plain data frame */
memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
@@ -2205,65 +2213,64 @@
struct iucv_sock *iucv = NULL;
struct sk_buff_head *list;
struct sk_buff *list_skb;
- struct sk_buff *this = NULL;
+ struct sk_buff *nskb;
unsigned long flags;
struct hlist_node *node;
- read_lock(&iucv_sk_list.lock);
+ read_lock_irqsave(&iucv_sk_list.lock, flags);
sk_for_each(sk, node, &iucv_sk_list.head)
if (sk == isk) {
iucv = iucv_sk(sk);
break;
}
- read_unlock(&iucv_sk_list.lock);
+ read_unlock_irqrestore(&iucv_sk_list.lock, flags);
- if (!iucv)
+ if (!iucv || sock_flag(sk, SOCK_ZAPPED))
return;
- bh_lock_sock(sk);
list = &iucv->send_skb_q;
- list_skb = list->next;
+ spin_lock_irqsave(&list->lock, flags);
if (skb_queue_empty(list))
goto out_unlock;
-
- spin_lock_irqsave(&list->lock, flags);
+ list_skb = list->next;
+ nskb = list_skb->next;
while (list_skb != (struct sk_buff *)list) {
if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
- this = list_skb;
switch (n) {
case TX_NOTIFY_OK:
- __skb_unlink(this, list);
+ __skb_unlink(list_skb, list);
+ kfree_skb(list_skb);
iucv_sock_wake_msglim(sk);
- dev_put(this->dev);
- kfree_skb(this);
break;
case TX_NOTIFY_PENDING:
atomic_inc(&iucv->pendings);
break;
case TX_NOTIFY_DELAYED_OK:
- __skb_unlink(this, list);
+ __skb_unlink(list_skb, list);
atomic_dec(&iucv->pendings);
if (atomic_read(&iucv->pendings) <= 0)
iucv_sock_wake_msglim(sk);
- dev_put(this->dev);
- kfree_skb(this);
+ kfree_skb(list_skb);
break;
case TX_NOTIFY_UNREACHABLE:
case TX_NOTIFY_DELAYED_UNREACHABLE:
case TX_NOTIFY_TPQFULL: /* not yet used */
case TX_NOTIFY_GENERALERROR:
case TX_NOTIFY_DELAYED_GENERALERROR:
- __skb_unlink(this, list);
- dev_put(this->dev);
- kfree_skb(this);
- sk->sk_state = IUCV_DISCONN;
- sk->sk_state_change(sk);
+ __skb_unlink(list_skb, list);
+ kfree_skb(list_skb);
+ if (sk->sk_state == IUCV_CONNECTED) {
+ sk->sk_state = IUCV_DISCONN;
+ sk->sk_state_change(sk);
+ }
break;
}
break;
}
- list_skb = list_skb->next;
+ list_skb = nskb;
+ nskb = nskb->next;
}
+out_unlock:
spin_unlock_irqrestore(&list->lock, flags);
if (sk->sk_state == IUCV_CLOSING) {
@@ -2273,8 +2280,6 @@
}
}
-out_unlock:
- bh_unlock_sock(sk);
}
static const struct proto_ops iucv_sock_ops = {
.family = PF_IUCV,