netdev - Re: [PATCH 2/2] net: stmmac: Set OWN bit for jumbo frames

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Message-ID: <4a4a3e09-da21-0bd5-969a-c3ea56f32552@linux.intel.com>
Date:   Mon, 22 Oct 2018 16:05:15 -0500
From:   Thor Thayer <thor.thayer@...ux.intel.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, davem@...emloft.net, dinguyen@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: stmmac: Set OWN bit for jumbo frames

On 10/22/2018 12:29 PM, thor.thayer@...ux.intel.com wrote:
> From: Thor Thayer <thor.thayer@...ux.intel.com>
> 
> Ping with Jumbo packet does not reply and get a watchdog timeout
> 
> [   46.059616] ------------[ cut here ]------------
> [   46.064268] NETDEV WATCHDOG: eth0 (socfpga-dwmac): transmit queue 0 timed out
> [   46.071471] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:461 dev_watchdog+0x2cc/0x2d8
> [   46.079708] Modules linked in:
> [   46.082761] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-00115-gc262be665854-dirty #264
> [   46.091082] Hardware name: SoCFPGA Stratix 10 SoCDK (DT)
> [   46.096377] pstate: 20000005 (nzCv daif -PAN -UAO)
> [   46.101152] pc : dev_watchdog+0x2cc/0x2d8
> [   46.105149] lr : dev_watchdog+0x2cc/0x2d8
> [   46.109144] sp : ffff00000800bd80
> [   46.112447] x29: ffff00000800bd80 x28: ffff80007a9b4940
> [   46.117744] x27: 00000000ffffffff x26: ffff80007aa183b0
> [   46.123040] x25: 0000000000000001 x24: 0000000000000140
> [   46.128336] x23: ffff80007aa1839c x22: ffff80007aa17fb0
> [   46.133632] x21: ffff80007aa18000 x20: ffff0000091a7000
> [   46.138927] x19: 0000000000000000 x18: ffffffffffffffff
> [   46.144223] x17: 0000000000000000 x16: 0000000000000000
> [   46.149519] x15: ffff0000091a96c8 x14: 07740775076f0720
> [   46.154814] x13: 07640765076d0769 x12: 0774072007300720
> [   46.160110] x11: 0765077507650775 x10: 0771072007740769
> [   46.165406] x9 : 076d0773076e0761 x8 : 077207740720073a
> [   46.170702] x7 : 072907630761076d x6 : ffff80007ff9a0c0
> [   46.175997] x5 : ffff80007ff9a0c0 x4 : 0000000000000002
> [   46.181293] x3 : 0000000000000000 x2 : ffff0000091ac180
> [   46.186589] x1 : e6a742ebe628e800 x0 : 0000000000000000
> [   46.191885] Call trace:
> [   46.194326]  dev_watchdog+0x2cc/0x2d8
> [   46.197980]  call_timer_fn+0x20/0x78
> [   46.201544]  expire_timers+0xa4/0xb0
> [   46.205108]  run_timer_softirq+0xe4/0x198
> [   46.209107]  __do_softirq+0x114/0x210
> [   46.212760]  irq_exit+0xd0/0xd8
> [   46.215895]  __handle_domain_irq+0x60/0xb0
> [   46.219977]  gic_handle_irq+0x58/0xa8
> [   46.223628]  el1_irq+0xb0/0x128
> [   46.226761]  arch_cpu_idle+0x10/0x18
> [   46.230326]  do_idle+0x1d4/0x288
> [   46.233544]  cpu_startup_entry+0x24/0x28
> [   46.237457]  secondary_start_kernel+0x17c/0x1c0
> [   46.241971] ---[ end trace 57048cd1372cd828 ]---
> 
> Inspection of queue showed Jumbo packets were not sent out.
> The ring Jumbo packet function needs to set the OWN bit so
> the packet is sent.
> 
> Signed-off-by: Thor Thayer <thor.thayer@...ux.intel.com>
> ---
>   drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
> index a7ffc73fffe8..c5fd9483bd96 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
> @@ -91,7 +91,7 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
>   		tx_q->tx_skbuff_dma[entry].is_jumbo = true;
>   		desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);
>   		stmmac_prepare_tx_desc(priv, desc, 1, nopaged_len, csum,
> -				STMMAC_RING_MODE, 0, true, skb->len);
> +				STMMAC_RING_MODE, 1, true, skb->len);
>   	}
>   
>   	tx_q->cur_tx = entry;
> 
I'm seeing a similar problem with packets > 8K. I'll send out a rev2 
with that fix shortly.