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Message-ID: <201202061709.31406.tim.sander@hbm.com>
Date: Mon, 6 Feb 2012 17:09:31 +0100
From: "Tim Sander" <tim.sander@....com>
To: "Eric Dumazet" <eric.dumazet@...il.com>
Cc: "Hector Palacios" <hector.palacios@...i.com>,
<netdev@...r.kernel.org>, <davem@...emloft.net>,
<shawn.guo@...aro.org>, <jgq516@...il.com>, <rostedt@...dmis.org>,
<u.kleine-koenig@...gutronix.de>, <tglx@...utronix.de>,
"Zeng Zhaoming" <b32542@...escale.com>,
"Frank Li" <Frank.Li@...escale.com>
Subject: Re: [PATCH] fec: fix tx bounce handling
Hi
I forward ported the patch i have for 3.0-rt (which was working on a quick test)
to the net-dev branch with the patch from Eric mixed in.
But a quick test revealed that dmesg is full of:
eth0: tx queue full!.
Not good! Any suggestions on this?
Tim
Heres my patch for 3.3:
diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index 336edd7..74d5865 100644
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -284,11 +284,6 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
unsigned short status;
unsigned long flags;
- if (!fep->link) {
- /* Link is down or autonegotiation is in progress. */
- return NETDEV_TX_BUSY;
- }
-
spin_lock_irqsave(&fep->hw_lock, flags);
/* Fill in a Tx ring entry */
bdp = fep->cur_tx;
@@ -319,8 +314,8 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
if (((unsigned long) bufaddr) & FEC_ALIGNMENT) {
unsigned int index;
index = bdp - fep->tx_bd_base;
- memcpy(fep->tx_bounce[index], skb->data, skb->len);
- bufaddr = fep->tx_bounce[index];
+ bufaddr = PTR_ALIGN(fep->tx_bounce[index], FEC_ALIGNMENT + 1);
+ memcpy(bufaddr, skb->data, skb->len);
}
/*
@@ -542,6 +537,9 @@ fec_stop(struct net_device *ndev)
writel(2, fep->hwp + FEC_ECNTRL);
writel(rmii_mode, fep->hwp + FEC_R_CNTRL);
}
+
+ netif_stop_queue(ndev);
+ fep->link=0;
}
@@ -1210,7 +1208,7 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
- skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE);
+ skb = __dev_alloc_skb(FEC_ENET_RX_FRSIZE, GFP_KERNEL);
if (!skb) {
fec_enet_free_buffers(ndev);
return -ENOMEM;
@@ -1230,6 +1228,10 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++) {
fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
+ if(!fep->tx_bounce[i]) {
+ fec_enet_free_buffers(ndev);
+ return -ENOMEM;
+ }
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
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