From 406f353c857e4b2dbddb7cd20c67941d829b8b15 Mon Sep 17 00:00:00 2001 From: Matheos Worku Date: Fri, 4 Jan 2008 23:48:26 -0800 Subject: [NIU]: Fix slowpath interrupt handling. niu_slowpath_interrupt() expects values to be setup in lp->{v0,v1,v2} but they aren't. That's only done by niu_schedule_napi() which is done later in the interrupt path. If niu_rx_error() returns zero, and v0 is clear, hit the RX_DMA_CTL_STATE register with a RX_DMA_CTL_STAT_MEX. Only emit verbose RX error logs if a fatal channel or port error is signalled. Other cases will be recorded into statistics by niu_log_rxchan_errors(). Signed-off-by: David S. Miller --- drivers/net/niu.c | 34 +++++++++++++++++++++++----------- 1 file changed, 23 insertions(+), 11 deletions(-) (limited to 'drivers/net/niu.c') diff --git a/drivers/net/niu.c b/drivers/net/niu.c index abfc61c3a38..32ed87d5470 100644 --- a/drivers/net/niu.c +++ b/drivers/net/niu.c @@ -2508,15 +2508,19 @@ static int niu_rx_error(struct niu *np, struct rx_ring_info *rp) u64 stat = nr64(RX_DMA_CTL_STAT(rp->rx_channel)); int err = 0; - dev_err(np->device, PFX "%s: RX channel %u error, stat[%llx]\n", - np->dev->name, rp->rx_channel, (unsigned long long) stat); - - niu_log_rxchan_errors(np, rp, stat); if (stat & (RX_DMA_CTL_STAT_CHAN_FATAL | RX_DMA_CTL_STAT_PORT_FATAL)) err = -EINVAL; + if (err) { + dev_err(np->device, PFX "%s: RX channel %u error, stat[%llx]\n", + np->dev->name, rp->rx_channel, + (unsigned long long) stat); + + niu_log_rxchan_errors(np, rp, stat); + } + nw64(RX_DMA_CTL_STAT(rp->rx_channel), stat & RX_DMA_CTL_WRITE_CLEAR_ERRS); @@ -2749,13 +2753,16 @@ static int niu_device_error(struct niu *np) return -ENODEV; } -static int niu_slowpath_interrupt(struct niu *np, struct niu_ldg *lp) +static int niu_slowpath_interrupt(struct niu *np, struct niu_ldg *lp, + u64 v0, u64 v1, u64 v2) { - u64 v0 = lp->v0; - u64 v1 = lp->v1; - u64 v2 = lp->v2; + int i, err = 0; + lp->v0 = v0; + lp->v1 = v1; + lp->v2 = v2; + if (v1 & 0x00000000ffffffffULL) { u32 rx_vec = (v1 & 0xffffffff); @@ -2764,8 +2771,13 @@ static int niu_slowpath_interrupt(struct niu *np, struct niu_ldg *lp) if (rx_vec & (1 << rp->rx_channel)) { int r = niu_rx_error(np, rp); - if (r) + if (r) { err = r; + } else { + if (!v0) + nw64(RX_DMA_CTL_STAT(rp->rx_channel), + RX_DMA_CTL_STAT_MEX); + } } } } @@ -2803,7 +2815,7 @@ static int niu_slowpath_interrupt(struct niu *np, struct niu_ldg *lp) if (err) niu_enable_interrupts(np, 0); - return -EINVAL; + return err; } static void niu_rxchan_intr(struct niu *np, struct rx_ring_info *rp, @@ -2905,7 +2917,7 @@ static irqreturn_t niu_interrupt(int irq, void *dev_id) } if (unlikely((v0 & ((u64)1 << LDN_MIF)) || v1 || v2)) { - int err = niu_slowpath_interrupt(np, lp); + int err = niu_slowpath_interrupt(np, lp, v0, v1, v2); if (err) goto out; } -- cgit v1.2.3-70-g09d2 From 792dd90f114a48c210c566f3642b26f699702cb7 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 4 Jan 2008 23:52:06 -0800 Subject: [NIU]: Missing ->last_rx update. Noticed by Paul Lodridge. Signed-off-by: David S. Miller --- drivers/net/niu.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/net/niu.c') diff --git a/drivers/net/niu.c b/drivers/net/niu.c index 32ed87d5470..babb1ef37e3 100644 --- a/drivers/net/niu.c +++ b/drivers/net/niu.c @@ -2241,6 +2241,8 @@ static int niu_process_rx_pkt(struct niu *np, struct rx_ring_info *rp) skb->protocol = eth_type_trans(skb, np->dev); netif_receive_skb(skb); + np->dev->last_rx = jiffies; + return num_rcr; } -- cgit v1.2.3-70-g09d2 From 3ebebccf89b1b6e4fec4de05b245d6c459f27ce8 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 4 Jan 2008 23:54:06 -0800 Subject: [NIU]: Fix potentially stuck TCP socket send queues. It is possible for the TX ring to have packets sit in it for unbounded amounts of time. The only way to defer TX interrupts in the chip is to periodically set "mark" bits, when processing of a TX descriptor with the mark bit set is complete it triggers the interrupt for the TX queue's LDG. A consequence of this kind of scheme is that if packet flow suddenly stops, the remaining TX packets will just sit there. If this happens, since those packets could be charged to TCP socket send queues, such sockets could get stuck. The simplest solution is to divorce the socket ownership of the packet once the device takes the SKB, by using skb_orphan() in niu_start_xmit(). In hindsight, it would have been much nicer if the chip provided two interrupt sources for TX (like basically every other ethernet chip does). Namely, keep the "mark" bit, but also signal the LDG when the TX queue becomes completely empty. That way there is no need to have a deadlock breaker like this. Signed-off-by: David S. Miller --- drivers/net/niu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/niu.c') diff --git a/drivers/net/niu.c b/drivers/net/niu.c index babb1ef37e3..ac361642567 100644 --- a/drivers/net/niu.c +++ b/drivers/net/niu.c @@ -5208,7 +5208,8 @@ static int niu_start_xmit(struct sk_buff *skb, struct net_device *dev) } kfree_skb(skb); skb = skb_new; - } + } else + skb_orphan(skb); align = ((unsigned long) skb->data & (16 - 1)); headroom = align + sizeof(struct tx_pkt_hdr); -- cgit v1.2.3-70-g09d2 From cb77df3ec88f07c6141924dfe6fd96a2f541cc09 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 5 Jan 2008 00:02:59 -0800 Subject: [NIU]: Update driver version and release date. Signed-off-by: David S. Miller --- drivers/net/niu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/net/niu.c') diff --git a/drivers/net/niu.c b/drivers/net/niu.c index ac361642567..9a0c6d3adfe 100644 --- a/drivers/net/niu.c +++ b/drivers/net/niu.c @@ -33,8 +33,8 @@ #define DRV_MODULE_NAME "niu" #define PFX DRV_MODULE_NAME ": " -#define DRV_MODULE_VERSION "0.5" -#define DRV_MODULE_RELDATE "October 5, 2007" +#define DRV_MODULE_VERSION "0.6" +#define DRV_MODULE_RELDATE "January 5, 2008" static char version[] __devinitdata = DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; -- cgit v1.2.3-70-g09d2