netdev - Re: [PATCH] net: ethernet: sun: niu set correct packet size in skb

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Date:   Thu, 03 May 2018 16:38:04 -0400
From:   rob@...lang.io
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: sun: niu set correct packet size in skb

Ah, gotcha. Should I make a new thread?

Patch should be properly formatted below.

Thanks,
Rob

Signed-off-by: Rob Taglang <rob@...lang.io>
---
  drivers/net/ethernet/sun/niu.c | 5 ++---
  1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/sun/niu.c 
b/drivers/net/ethernet/sun/niu.c
index f081de4..88c1247 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -3443,7 +3443,7 @@ static int niu_process_rx_pkt(struct napi_struct 
*napi, struct niu *np,

  		len = (val & RCR_ENTRY_L2_LEN) >>
  			RCR_ENTRY_L2_LEN_SHIFT;
-		len -= ETH_FCS_LEN;
+		append_size = len + ETH_HLEN + ETH_FCS_LEN;

  		addr = (val & RCR_ENTRY_PKT_BUF_ADDR) <<
  			RCR_ENTRY_PKT_BUF_ADDR_SHIFT;
@@ -3453,7 +3453,6 @@ static int niu_process_rx_pkt(struct napi_struct 
*napi, struct niu *np,
  					 RCR_ENTRY_PKTBUFSZ_SHIFT];

  		off = addr & ~PAGE_MASK;
-		append_size = rcr_size;
  		if (num_rcr == 1) {
  			int ptype;

@@ -3466,7 +3465,7 @@ static int niu_process_rx_pkt(struct napi_struct 
*napi, struct niu *np,
  			else
  				skb_checksum_none_assert(skb);
  		} else if (!(val & RCR_ENTRY_MULTI))
-			append_size = len - skb->len;
+			append_size = append_size - skb->len;

  		niu_rx_skb_append(skb, page, off, append_size, rcr_size);
  		if ((page->index + rp->rbr_block_size) - rcr_size == addr) {


On 2018-05-03 16:04, David Miller wrote:
> From: Rob Taglang <rob@...lang.io>
> Date: Thu, 03 May 2018 11:06:04 -0400
> 
>> Currently, skb->len and skb->data_len are set to the page size, not
>> the packet size. This causes the frame check sequence to not be
>> located at the "end" of the packet resulting in ethernet frame check
>> errors. The driver does work currently, but stricter kernel facing
>> networking solutions like OpenVSwitch will drop these packets as
>> invalid.
>> 
>> These changes set the packet size correctly so that these errors no
>> longer occur. The length does not include the frame check sequence, so
>> that subtraction was removed.
>> 
>> Tested on Oracle/SUN Multithreaded 10-Gigabit Ethernet Network
>> Controller [108e:abcd].
>> 
>> This is a resubmission after subscribing to the list; I think it got
>> caught in a spam filter since I can't see my message in the archive,
>> but if not and this is just pissing off a maintainer I'm really sorry.
>> 
>> Signed-off-by: Rob Taglang <rob@...lang.io>
>> ---
>> drivers/net/ethernet/sun/niu.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/net/ethernet/sun/niu.c
>> b/drivers/net/ethernet/sun/niu.c
>> index f081de4..88c1247 100644
>> --- a/drivers/net/ethernet/sun/niu.c
>> +++ b/drivers/net/ethernet/sun/niu.c
>> @@ -3443,7 +3443,7 @@ static int niu_process_rx_pkt(struct napi_struct
>> *napi, struct niu *np,
>> 
>>                len = (val & RCR_ENTRY_L2_LEN) >>
>>                        RCR_ENTRY_L2_LEN_SHIFT;
>> - len -= ETH_FCS_LEN;
>> + append_size = len + ETH_HLEN + ETH_FCS_LEN;
> 
> This patch is severely corrupted by your email client.
> 
> Please fix this, send the patch to yourself as a test, and only repost
> the patch here on the list once you can successfully apply the patch
> contained in the test email.
> 
> Thanks.