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Message-ID: <dd6f13bc-c5f2-85f8-c08d-837bc024fc7c@gmail.com>
Date: Mon, 18 Jun 2018 16:36:15 -0700
From: Eric Dumazet <eric.dumazet@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>,
Mathieu Malaterre <malat@...ian.org>
Cc: schwab@...ux-m68k.org, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Christophe LEROY <christophe.leroy@....fr>,
Meelis Roos <mroos@...ux.ee>, netdev@...r.kernel.org,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are
friends"
On 06/18/2018 04:29 PM, Eric Dumazet wrote:
>
>
> On 06/18/2018 11:45 AM, Mathieu Malaterre wrote:
>
>>
>> Here is what I get on my side
>>
>> [ 53.628847] sungem: sungem wrong csum : 4e04/f97, len 64 bytes
>> [ 53.667063] sungem: sungem wrong csum : eea8/6eec, len 149 bytes
>> [ 58.648952] sungem: sungem wrong csum : 2095/3d06, len 64 bytes
>> [ 58.669414] sungem: sungem wrong csum : 5245/b50, len 149 bytes
>> [ 63.674451] sungem: sungem wrong csum : 2d8/5abd, len 149 bytes
>> [ 68.678233] sungem: sungem wrong csum : b8fc/a498, len 149 bytes
>> [ 73.685771] sungem: sungem wrong csum : 374/5a21, len 149 bytes
>> [ 78.689089] sungem: sungem wrong csum : d81/5014, len 149 bytes
>> [ 83.683261] sungem: sungem wrong csum : 4e04/f97, len 64 bytes
>> [ 83.690193] sungem: sungem wrong csum : c2f7/9a9d, len 149 bytes
>> [ 88.692511] sungem: sungem wrong csum : f4d8/68bc, len 149 bytes
>> [ 93.699915] sungem: sungem wrong csum : 1370/4a25, len 149 bytes
>> [ 98.703136] sungem: sungem wrong csum : e1b5/7bdf, len 149 bytes
>> [ 103.704230] sungem: sungem wrong csum : 5321/a74, len 149 bytes
>> [ 108.688912] sungem: sungem wrong csum : 2095/3d06, len 64 bytes
>> [ 108.706559] sungem: sungem wrong csum : ddbc/7fd8, len 149 bytes
>> [ 113.713189] sungem: sungem wrong csum : 5a65/330, len 149 bytes
>> [ 113.891697] sungem: sungem wrong csum : 4e04/f97, len 64 bytes
>> [ 118.717151] sungem: sungem wrong csum : f7c8/65cc, len 149 bytes
>> [ 123.722680] sungem: sungem wrong csum : 3d7a/201b, len 149 bytes
>> [ 128.726524] sungem: sungem wrong csum : c8fd/9497, len 149 bytes
>> [ 133.732045] sungem: sungem wrong csum : de0d/7f87, len 149 bytes
>> [ 135.529163] sungem: sungem wrong csum : 3089/b6dd, len 96 bytes
>> [ 135.529208] eth0: hw csum failure
>> [ 135.529220] CPU: 0 PID: 0 Comm: swapper Not tainted 4.17.0+ #7
>> [ 135.529226] Call Trace:
>> [ 135.529243] [dffedbe0] [c069ddac]
>> __skb_checksum_complete+0xf0/0x108 (unreliable)
>
> Thanks, then I guess next step would be to dump the content of the frames
> having a wrong checksum, hoping we find an easy way to discard the CHECKSUM_COMPLETE
> in a selective way.
>
> Otherwise, we will need to remove CHECKSUM_COMPLETE setting in this driver.
>
> diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c
> index 7a16d40a72d13cf1d522e8a3a396c826fe76f9b9..77a761f95be788bb86c8d917f613c9084818f826 100644
> --- a/drivers/net/ethernet/sun/sungem.c
> +++ b/drivers/net/ethernet/sun/sungem.c
> @@ -857,6 +857,14 @@ static int gem_rx(struct gem *gp, int work_to_do)
>
> csum = (__force __sum16)htons((status & RXDCTRL_TCPCSUM) ^ 0xffff);
> skb->csum = csum_unfold(csum);
> + {
> + __wsum rsum = csum_partial(skb->data + ETH_HLEN, len - ETH_HLEN, 0);
> + if (csum != csum_fold(rsum) && net_ratelimit())
> + pr_err("sungem wrong csum : %04x/%04x, len %u bytes\n",
> + csum, csum_fold(rsum), len);
> + print_hex_dump(KERN_ERR, "raw data: ", DUMP_PREFIX_OFFSET,
DUMP_PREFIX_ADDRESS might give us more information (say alignment problem, or crossing page boundaries)
> + 16, 1, skb->data, len, true);
> + }
> skb->ip_summed = CHECKSUM_COMPLETE;
> skb->protocol = eth_type_trans(skb, gp->dev);
>
>
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