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Date: Tue, 16 Mar 2010 17:00:39 +0200
From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>,
David Miller <davem@...emloft.net>,
Ingo Molnar <mingo@...e.hu>,
Francois Romieu <romieu@...zoreil.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
netdev@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] r8169: Fix rtl8169_rx_interrupt()
Nope!
Here it is:
[17250.998293] ------------[ cut here ]------------
[17250.998305] WARNING: at net/sched/sch_generic.c:255 dev_watchdog+0xc1/0x125()
[17250.998308] Hardware name: F3JC
[17250.998312] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
[17250.998315] Modules linked in: pktgen ppp_async crc_ccitt ipv6 ppp_generic slhc snd_hwdep snd_hda_codec_si3054 snd_hda_codec_realtek sdhci_pci sdhci asus_laptop sparse_keymap
mmc_core led_class snd_hda_intel snd_hda_codec snd_pcm snd_timer snd_page_alloc rng_core sg evdev i2c_i801 snd soundcore psmouse r8169 serio_raw mii uhci_hcd ehci_hcd sr_mod
usbcore cdrom sd_mod ata_piix
[17250.998371] Pid: 3985, comm: kpktgend_0 Tainted: G W 2.6.34-rc1-dbg-git6-r8169 #46
[17250.998375] Call Trace:
[17250.998383] [<c102e353>] warn_slowpath_common+0x65/0x7c
[17250.998388] [<c126b654>] ? dev_watchdog+0xc1/0x125
[17250.998393] [<c102e39e>] warn_slowpath_fmt+0x24/0x27
[17250.998398] [<c126b654>] dev_watchdog+0xc1/0x125
[17250.998405] [<c1036bbb>] ? run_timer_softirq+0x120/0x1eb
[17250.998411] [<c1036c11>] run_timer_softirq+0x176/0x1eb
[17250.998416] [<c1036bbb>] ? run_timer_softirq+0x120/0x1eb
[17250.998421] [<c126b593>] ? dev_watchdog+0x0/0x125
[17250.998426] [<c1032df9>] __do_softirq+0x8d/0x117
[17250.998431] [<c1032eae>] do_softirq+0x2b/0x43
[17250.998436] [<c1032fd3>] irq_exit+0x38/0x75
[17250.998442] [<c1014e75>] smp_apic_timer_interrupt+0x66/0x74
[17250.998448] [<c12c812a>] apic_timer_interrupt+0x36/0x3c
[17250.998457] [<c1185d18>] ? do_raw_spin_trylock+0x28/0x37
[17250.998464] [<c12c7101>] _raw_spin_lock+0x2f/0x58
[17250.998472] [<f80855ca>] ? spin_lock+0x8/0xa [pktgen]
[17250.998478] [<f80855ca>] spin_lock+0x8/0xa [pktgen]
[17250.998484] [<f80873b6>] pktgen_thread_worker+0x9b/0x631 [pktgen]
[17250.998491] [<c103f9f1>] ? autoremove_wake_function+0x0/0x2f
[17250.998497] [<c103f9f1>] ? autoremove_wake_function+0x0/0x2f
[17250.998503] [<f808731b>] ? pktgen_thread_worker+0x0/0x631 [pktgen]
[17250.998508] [<c103f6ce>] kthread+0x6a/0x6f
[17250.998514] [<c103f664>] ? kthread+0x0/0x6f
[17250.998520] [<c1002e42>] kernel_thread_helper+0x6/0x1a
[17250.998523] ---[ end trace a22d306b065d4a68 ]---
[17251.011663] r8169 0000:02:00.0: eth0: link up
[17419.011748] NOHZ: local_softirq_pending 08
Sergey
On (03/16/10 01:33), Eric Dumazet wrote:
> > Yes, this is wrong. In this context (process context, not softirq), we
> > should use netif_rx() or just drop frames if we are in reset phase.
> >
>
> Sergey,
>
> Here is a compiled but untested patch (I dont have the hardware), could
> you please test it ?
>
> Thanks
>
> [PATCH] r8169: Fix rtl8169_rx_interrupt()
>
> In case a reset is performed, rtl8169_rx_interrupt() is called from
> process context instead of softirq context. Special care must be taken
> to call appropriate network core services (netif_rx() instead of
> netif_receive_skb()). VLAN handling also corrected.
>
> Reported-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Diagnosed-by: Oleg Nesterov <oleg@...hat.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
> diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
> index 9d3ebf3..d873639 100644
> --- a/drivers/net/r8169.c
> +++ b/drivers/net/r8169.c
> @@ -1038,14 +1038,14 @@ static void rtl8169_vlan_rx_register(struct net_device *dev,
> }
>
> static int rtl8169_rx_vlan_skb(struct rtl8169_private *tp, struct RxDesc *desc,
> - struct sk_buff *skb)
> + struct sk_buff *skb, int polling)
> {
> u32 opts2 = le32_to_cpu(desc->opts2);
> struct vlan_group *vlgrp = tp->vlgrp;
> int ret;
>
> if (vlgrp && (opts2 & RxVlanTag)) {
> - vlan_hwaccel_receive_skb(skb, vlgrp, swab16(opts2 & 0xffff));
> + __vlan_hwaccel_rx(skb, vlgrp, swab16(opts2 & 0xffff), polling);
> ret = 0;
> } else
> ret = -1;
> @@ -1062,7 +1062,7 @@ static inline u32 rtl8169_tx_vlan_tag(struct rtl8169_private *tp,
> }
>
> static int rtl8169_rx_vlan_skb(struct rtl8169_private *tp, struct RxDesc *desc,
> - struct sk_buff *skb)
> + struct sk_buff *skb, int polling)
> {
> return -1;
> }
> @@ -4429,12 +4429,20 @@ out:
> return done;
> }
>
> +/*
> + * Warning : rtl8169_rx_interrupt() might be called :
> + * 1) from NAPI (softirq) context
> + * (polling = 1 : we should call netif_receive_skb())
> + * 2) from process context (rtl8169_reset_task())
> + * (polling = 0 : we must call netif_rx() instead)
> + */
> static int rtl8169_rx_interrupt(struct net_device *dev,
> struct rtl8169_private *tp,
> void __iomem *ioaddr, u32 budget)
> {
> unsigned int cur_rx, rx_left;
> unsigned int delta, count;
> + int polling = (budget != ~(u32)0) ? 1 : 0;
>
> cur_rx = tp->cur_rx;
> rx_left = NUM_RX_DESC + tp->dirty_rx - cur_rx;
> @@ -4496,8 +4504,12 @@ static int rtl8169_rx_interrupt(struct net_device *dev,
> skb_put(skb, pkt_size);
> skb->protocol = eth_type_trans(skb, dev);
>
> - if (rtl8169_rx_vlan_skb(tp, desc, skb) < 0)
> - netif_receive_skb(skb);
> + if (rtl8169_rx_vlan_skb(tp, desc, skb, polling) < 0) {
> + if (likely(polling))
> + netif_receive_skb(skb);
> + else
> + netif_rx(skb);
> + }
>
> dev->stats.rx_bytes += pkt_size;
> dev->stats.rx_packets++;
>
>
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