In the current arcnet driver, the hard_start_xmit method allocates a
buffer for an outgoing transmission. However, this method doesn't check
whether there was already an allocated buffer from an earlier outgoing
transmission. This patch checks whether lp->next_tx already had an
allocated buffer, and if so, it returns NETDEV_TX_BUSY. This prevents
buffers from dissapearing under heavy traffic.
This patch seems to work fine on my arcnet network, and I also sent it to
the person (Esben Nielsen [email protected]) who made some arcnet patches
in 2.6.8 and 2.6.11, and they work fine on his setup too.
url to the patch:
http://pieter.dejaeghere.net:9080/arcnet/patch-buffer
inlined (hopefully without broken linewraps):
--- linux-2.6.12-gentoo-r1/drivers/net/arcnet/arcnet.c 2005-06-25
20:42:46.000000000 +0200
+++ linux-2.6.13-gentoo/drivers/net/arcnet/arcnet.c 2005-09-03
19:46:54.227846664 +0200
@@ -597,7 +597,7 @@ static int arcnet_send_packet(struct sk_
struct ArcProto *proto;
int txbuf;
unsigned long flags;
- int freeskb = 0;
+ int freeskb, retval;
BUGMSG(D_DURING,
"transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol
%x)\n",
@@ -615,7 +615,7 @@ static int arcnet_send_packet(struct sk_
if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
dev_kfree_skb(skb);
- return 0; /* don't try again */
+ return NETDEV_TX_OK; /* don't try again */
}
/* We're busy transmitting a packet... */
@@ -623,8 +623,11 @@ static int arcnet_send_packet(struct sk_
spin_lock_irqsave(&lp->lock, flags);
AINTMASK(0);
-
- txbuf = get_arcbuf(dev);
+ if(lp->next_tx == -1)
+ txbuf = get_arcbuf(dev);
+ else {
+ txbuf = -1;
+ }
if (txbuf != -1) {
if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
!proto->ack_tx) {
@@ -638,6 +641,8 @@ static int arcnet_send_packet(struct sk_
lp->outgoing.skb = skb;
lp->outgoing.pkt = pkt;
+ freeskb = 0;
+
if (proto->continue_tx &&
proto->continue_tx(dev, txbuf)) {
BUGMSG(D_NORMAL,
@@ -645,10 +650,12 @@ static int arcnet_send_packet(struct sk_
"(proto='%c')\n", proto->suffix);
}
}
-
+ retval = NETDEV_TX_OK;
+ dev->trans_start = jiffies;
lp->next_tx = txbuf;
} else {
- freeskb = 1;
+ retval = NETDEV_TX_BUSY;
+ freeskb = 0;
}
BUGMSG(D_DEBUG, "%s: %d: %s, status:
%x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
@@ -664,7 +671,7 @@ static int arcnet_send_packet(struct sk_
if (freeskb) {
dev_kfree_skb(skb);
}
- return 0; /* no need to try again */
+ return retval; /* no need to try again */
}
@@ -690,7 +697,6 @@ static int go_tx(struct net_device *dev)
/* start sending */
ACOMMAND(TXcmd | (lp->cur_tx << 3));
- dev->trans_start = jiffies;
lp->stats.tx_packets++;
lp->lasttrans_dest = lp->lastload_dest;
lp->lastload_dest = 0;
@@ -917,6 +923,9 @@ irqreturn_t arcnet_interrupt(int irq, vo
BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
status);
+ /* MYRECON bit is at bit 7 of diagstatus */
+ if(diagstatus & 0x80)
+ BUGMSG(D_RECON,"Put out that recon myself\n");
/* is the RECON info empty or old? */
if (!lp->first_recon || !lp->last_recon ||
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |