DPDK patches and discussions
 help / color / mirror / Atom feed
From: Jie Hai <haijie1@huawei.com>
To: Ferruh Yigit <ferruh.yigit@amd.com>, <dev@dpdk.org>
Cc: <lihuisong@huawei.com>, <fengchengwen@huawei.com>,
	<liuyonglong@huawei.com>, <huangdengdui@huawei.com>
Subject: Re: [PATCH] net/hns3: fix Rx packet truncation when KEEP CRC enabled
Date: Tue, 20 Feb 2024 11:58:57 +0800	[thread overview]
Message-ID: <7438563e-c7b4-6e13-68bf-74ff423546af@huawei.com> (raw)
In-Reply-To: <11b8feac-4a9e-4d2c-8995-ed492d684750@amd.com>

Hi, Ferruh,

Thanks for your review.

On 2024/2/7 22:15, Ferruh Yigit wrote:
> On 2/6/2024 1:10 AM, Jie Hai wrote:
>> From: Dengdui Huang <huangdengdui@huawei.com>
>>
>> When KEEP_CRC offload is enabled, some packets will be truncated and
>> the CRC is still be stripped in following cases:
>> 1. For HIP08 hardware, the packet type is TCP and the length
>>     is less than or equal to 60B.
>> 2. For other hardwares, the packet type is IP and the length
>>     is less than or equal to 60B.
>>
> 
> If a device doesn't support the offload by some packets, it can be
> option to disable offload for that device, instead of calculating it in
> software and append it.

The KEEP CRC feature of hns3 is faulty only in the specific packet
type and small packet(<60B) case.
What's more, the small ethernet packet is not common.

> Unless you have a specific usecase, or requirement to support the offload.

Yes, some users of hns3 are already using this feature.
So we cannot drop this offload

> <...>
> 
>> @@ -2492,10 +2544,16 @@ hns3_recv_pkts_simple(void *rx_queue,
>>   			goto pkt_err;
>>   
>>   		rxm->packet_type = hns3_rx_calc_ptype(rxq, l234_info, ol_info);
>> -
>>   		if (rxm->packet_type == RTE_PTYPE_L2_ETHER_TIMESYNC)
>>   			rxm->ol_flags |= RTE_MBUF_F_RX_IEEE1588_PTP;
>>   
>> +		if (unlikely(rxq->crc_len > 0)) {
>> +			if (hns3_need_recalculate_crc(rxq, rxm))
>> +				hns3_recalculate_crc(rxq, rxm);
>> +			rxm->pkt_len -= rxq->crc_len;
>> +			rxm->data_len -= rxq->crc_len;
>>
> 
> Removing 'crc_len' from 'mbuf->pkt_len' & 'mbuf->data_len' is
> practically same as stripping CRC.
> 
> We don't count CRC length in the statistics, but it should be accessible
> in the payload by the user.
Our drivers are behaving exactly as you say.
> 
> .

  reply	other threads:[~2024-02-20  3:59 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-06  1:10 Jie Hai
2024-02-07 14:15 ` Ferruh Yigit
2024-02-20  3:58   ` Jie Hai [this message]
2024-02-23 13:53     ` Ferruh Yigit
2024-02-26  3:16       ` Jie Hai
2024-02-26 16:43         ` Ferruh Yigit
2024-02-28  2:27           ` huangdengdui
2024-02-28 13:07             ` Ferruh Yigit
2024-02-29  3:58               ` huangdengdui
2024-02-29  9:25                 ` Ferruh Yigit
2024-03-01  6:55                   ` huangdengdui
2024-03-01 11:10                     ` Ferruh Yigit
2024-03-08 11:36                       ` Jie Hai
2024-03-22  6:28                         ` Jie Hai
2024-06-03  1:38                       ` Jie Hai
2024-06-03  2:33                         ` Stephen Hemminger
2024-06-03  5:24                           ` Morten Brørup
2024-06-03  7:07                           ` Andrew Rybchenko
2024-07-18 11:48 ` [PATCH v2 0/3] bugfix about KEEP CRC offload Jie Hai
2024-07-18 11:48   ` [PATCH v2 1/3] ethdev: add description for " Jie Hai
2024-07-18 11:57     ` Morten Brørup
2024-07-18 11:48   ` [PATCH v2 2/3] net/hns3: fix packet length do not contain CRC data length Jie Hai
2024-07-18 11:48   ` [PATCH v2 3/3] net/hns3: fix Rx packet without CRC data Jie Hai
2024-07-18 12:35   ` [PATCH v2 0/3] bugfix about KEEP CRC offload lihuisong (C)
2024-07-19  9:04 ` [PATCH v3 " Jie Hai
2024-07-19  9:04   ` [PATCH v3 1/3] ethdev: add description for " Jie Hai
2024-09-05  6:33     ` Andrew Rybchenko
2024-07-19  9:04   ` [PATCH v3 2/3] net/hns3: fix packet length do not contain CRC data length Jie Hai
2024-07-19  9:04   ` [PATCH v3 3/3] net/hns3: fix Rx packet without CRC data Jie Hai
2024-07-19  9:49   ` [PATCH v3 0/3] bugfix about KEEP CRC offload fengchengwen
2024-08-09  9:21   ` Jie Hai
2024-09-05  2:53   ` Jie Hai
2024-10-18  1:39   ` Jie Hai
2024-11-06  2:19   ` Jie Hai

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=7438563e-c7b4-6e13-68bf-74ff423546af@huawei.com \
    --to=haijie1@huawei.com \
    --cc=dev@dpdk.org \
    --cc=fengchengwen@huawei.com \
    --cc=ferruh.yigit@amd.com \
    --cc=huangdengdui@huawei.com \
    --cc=lihuisong@huawei.com \
    --cc=liuyonglong@huawei.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).