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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	Steve Yang <stevex.yang@intel.com>,
	dev@dpdk.org
Cc: wenzhuo.lu@intel.com, beilei.xing@intel.com,
	bernard.iremonger@intel.com,  asomalap@amd.com,
	rahul.lakkireddy@chelsio.com, hemant.agrawal@nxp.com,
	sachin.saxena@oss.nxp.com, jia.guo@intel.com,
	haiyue.wang@intel.com, g.singh@nxp.com, xuanziyang2@huawei.com,
	cloud.wangxiaoyun@huawei.com, zhouguoyang@huawei.com,
	xavier.huwei@huawei.com, humin29@huawei.com,
	yisen.zhuang@huawei.com, oulijun@huawei.com,
	jingjing.wu@intel.com, qiming.yang@intel.com,
	qi.z.zhang@intel.com, rosen.xu@intel.com, sthotton@marvell.com,
	srinivasan@marvell.com, heinrich.kuhn@netronome.com,
	hkalra@marvell.com, jerinj@marvell.com, ndabilpuram@marvell.com,
	kirankumark@marvell.com, rmody@marvell.com, shshaikh@marvell.com,
	mczekaj@marvell.com, thomas@monjalon.net, ivan.boule@6wind.com,
	konstantin.ananyev@intel.com, samuel.gauthier@6wind.com,
	david.marchand@6wind.com, shahafs@mellanox.com,
	stephen@networkplumber.org, maxime.coquelin@redhat.com,
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	shreyansh.jain@nxp.com, wei.dai@intel.com,
	fengchunsong@huawei.com, chenhao164@huawei.com,
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	yanglong.wu@intel.com, xiaolong.ye@intel.com, ting.xu@intel.com,
	xiaoyun.li@intel.com, dan.wei@intel.com, andy.pei@intel.com,
	vattunuru@marvell.com, skori@marvell.com, sony.chacko@qlogic.com,
	bruce.richardson@intel.com, ivan.malov@oktetlabs.ru,
	rad@semihalf.com, slawomir.rosek@semihalf.com,
	kamil.rytarowski@caviumnetworks.com, wei.zhao1@intel.com,
	junyux.jiang@intel.com, kumaras@chelsio.com,
	girish.nandibasappa@amd.com, rolf.neugebauer@netronome.com,
	alejandro.lucero@netronome.com
Subject: Re: [dpdk-dev] [PATCH v2 01/22] ethdev: fix MTU size exceeds max rx packet length
Date: Wed, 13 Jan 2021 10:32:12 +0000
Message-ID: <00150f49-8778-579d-e6f2-bb2b09fdf243@intel.com> (raw)
In-Reply-To: <a6cd02c0-fb48-6ab7-794d-dd70e24f2493@oktetlabs.ru>

On 12/28/2020 2:51 PM, Andrew Rybchenko wrote:
> On 12/17/20 12:22 PM, Steve Yang wrote:
>> If max rx packet length is smaller then MTU + Ether overhead, that will
>> drop all MTU size packets.
>>
>> Update the MTU size according to the max rx packet and Ether overhead.
>>
>> Fixes: 59d0ecdbf0e1 ("ethdev: MTU accessors")
>>
>> Signed-off-by: Steve Yang <stevex.yang@intel.com>
>> ---
>>   lib/librte_ethdev/rte_ethdev.c | 21 ++++++++++++++++++---
>>   1 file changed, 18 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
>> index 17ddacc78d..ff6a1e675f 100644
>> --- a/lib/librte_ethdev/rte_ethdev.c
>> +++ b/lib/librte_ethdev/rte_ethdev.c
>> @@ -1292,6 +1292,7 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
>>   	struct rte_eth_dev *dev;
>>   	struct rte_eth_dev_info dev_info;
>>   	struct rte_eth_conf orig_conf;
>> +	uint16_t overhead_len;
>>   	int diag;
>>   	int ret;
>>   
>> @@ -1323,6 +1324,15 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
>>   	if (ret != 0)
>>   		goto rollback;
>>   
>> +	/* Get the real Ethernet overhead length */
>> +	if (dev_info.max_mtu &&
> 
> First of all I'm not sure that we need to handle 0 value
> separately. Or it should be checked separately and trigger
> an error since it is a driver mis-behaviour.
> 

Agree. Most probably we can drop it, "dev_info.max_mtu != UINT16_MAX" covers the 
case driver doesn't provide any value.

> If kept, it should be compared vs 0 explicitly in accordance
> with DPDK coding style.
> 
>> +	    dev_info.max_mtu != UINT16_MAX &&
>> +	    dev_info.max_rx_pktlen &&
> 
> It should be compared vs 0 explicitly in accordance
> with DPDK coding style.
> 
>> +	    dev_info.max_rx_pktlen > dev_info.max_mtu)
>> +		overhead_len = dev_info.max_rx_pktlen - dev_info.max_mtu;
>> +	else
>> +		overhead_len = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
>> +
>>   	/* If number of queues specified by application for both Rx and Tx is
>>   	 * zero, use driver preferred values. This cannot be done individually
>>   	 * as it is valid for either Tx or Rx (but not both) to be zero.
>> @@ -1410,13 +1420,18 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
>>   			goto rollback;
>>   		}
>>   	} else {
>> -		if (dev_conf->rxmode.max_rx_pkt_len < RTE_ETHER_MIN_LEN ||
>> -			dev_conf->rxmode.max_rx_pkt_len > RTE_ETHER_MAX_LEN)
>> +		uint16_t pktlen = dev_conf->rxmode.max_rx_pkt_len;
>> +		if (pktlen < RTE_ETHER_MIN_MTU + overhead_len ||
>> +			pktlen > RTE_ETHER_MTU + overhead_len)
> 
> Alignment looks misleading. Either two tabs or just 4 spaces.
> 
>>   			/* Use default value */
>>   			dev->data->dev_conf.rxmode.max_rx_pkt_len =
>> -							RTE_ETHER_MAX_LEN;
>> +						RTE_ETHER_MTU + overhead_len;
>>   	}
>>   
>> +	/* Scale the MTU size to adapt max_rx_pkt_len */
>> +	dev->data->mtu = dev->data->dev_conf.rxmode.max_rx_pkt_len -
>> +				overhead_len;
>> +
> 
> Is it expected side effect that re-configure always resets
> previously set MTU. I.e.:
>     configure -> set_mtu -> start -> stop -> re-configure
> and set MTU is lost.
> 

This is the problem of two APIs updating same/related values, when device 
re-configure with a given 'max_rx_pkt_len', can we know if the intentions is 
update to the value to new provided 'max_rx_pkt_len' or not?

For this case if user want to keep the MTU value, can read the MTU from device 
first and set 'max_rx_pkt_len' according it.

And we can reduce to updating the MTU in the configure() only when JUMBO frame 
offload is requested, that should be when the 'max_rx_pkt_len' is valid only.

>>   	/*
>>   	 * If LRO is enabled, check that the maximum aggregated packet
>>   	 * size is supported by the configured device.
>>
> 


  reply	other threads:[~2021-01-13 10:32 UTC|newest]

Thread overview: 115+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-09  3:16 [dpdk-dev] [PATCH v1 00/12] fix rx packets dropped issue Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 01/12] net/dpaa2: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 02/12] net/e1000: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 03/12] net/hns3: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 04/12] net/i40e: fix the jumbo frame flag condition Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 05/12] net/iavf: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 06/12] net/ice: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 07/12] net/ipn3ke: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 08/12] net/octeontx: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 09/12] net/octeontx2: fix the jumbo frame flag condition for mtu Steve Yang
2020-12-21  7:16   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 10/12] net/qede: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 11/12] net/sfc: " Steve Yang
2020-12-09  3:16 ` [dpdk-dev] [PATCH v1 12/12] net/thunderx: " Steve Yang
2020-12-11  4:31 ` [dpdk-dev] [PATCH v1 00/12] fix rx packets dropped issue Guo, Jia
2020-12-14 17:44 ` Ferruh Yigit
2020-12-17  9:22 ` [dpdk-dev] [PATCH v2 00/22] " Steve Yang
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 01/22] ethdev: fix MTU size exceeds max rx packet length Steve Yang
2020-12-28 14:51     ` Andrew Rybchenko
2021-01-13 10:32       ` Ferruh Yigit [this message]
2020-12-30 10:19     ` oulijun
     [not found]       ` <DM6PR11MB43627F10DDAFC9801816FF5BF9D00@DM6PR11MB4362.namprd11.prod.outlook.com>
2021-01-13 10:25         ` Ferruh Yigit
2021-01-13 11:04         ` Ferruh Yigit
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 02/22] app/testpmd: fix max rx packet length for VLAN packets Steve Yang
2021-01-13 11:26     ` Ferruh Yigit
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 03/22] net/dpaa: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 04/22] net/dpaa2: " Steve Yang
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 05/22] net/e1000: " Steve Yang
2020-12-18  2:42     ` Guo, Jia
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 06/22] net/hns3: " Steve Yang
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 07/22] net/i40e: fix the jumbo frame flag condition Steve Yang
2020-12-18  2:44     ` Guo, Jia
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 08/22] net/iavf: " Steve Yang
2020-12-17  9:22   ` [dpdk-dev] [PATCH v2 09/22] net/ice: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 10/22] net/ipn3ke: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-19  0:54     ` Xu, Rosen
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 11/22] net/octeontx: " Steve Yang
2020-12-21 15:04     ` [dpdk-dev] [EXT] " Harman Kalra
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 12/22] net/octeontx2: fix the jumbo frame flag condition for mtu Steve Yang
2020-12-18 10:15     ` Nithin Dabilpuram
2020-12-21  7:19     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 13/22] net/qede: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 14/22] net/sfc: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 15/22] net/thunderx: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 16/22] net/ixgbe: fix the jumbo frame flag condition Steve Yang
2020-12-18  2:43     ` Guo, Jia
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 17/22] net/cxgbe: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 18/22] net/axgbe: fix the jumbo frame flag condition for mtu set Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 19/22] net/enetc: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 20/22] net/hinic: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 21/22] net/nfp: " Steve Yang
2020-12-17  9:23   ` [dpdk-dev] [PATCH v2 22/22] net/liquidio: " Steve Yang
2021-01-13 11:32   ` [dpdk-dev] [PATCH v2 00/22] fix rx packets dropped issue Ferruh Yigit
2021-01-14  9:45   ` [dpdk-dev] [PATCH v3 " Steve Yang
2021-01-14  9:45   ` [dpdk-dev] [PATCH v3 01/22] ethdev: fix MTU size exceeds max rx packet length Steve Yang
2021-01-14 16:36     ` Ferruh Yigit
2021-01-14 17:13       ` Ferruh Yigit
2021-01-14 17:29         ` Andrew Boyer
2021-01-14 20:44           ` Ferruh Yigit
2021-01-15 10:44     ` oulijun
2021-01-18 10:42       ` Ferruh Yigit
2021-01-19  8:46         ` oulijun
2021-01-23  9:05           ` oulijun
2021-01-25 12:22           ` Ferruh Yigit
2021-01-18  7:04     ` [dpdk-dev] [PATCH v4 00/22] fix rx packets dropped issue Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 01/22] ethdev: fix MTU size exceeds max rx packet length Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 02/22] app/testpmd: fix max rx packet length for VLAN packets Steve Yang
2021-01-21 15:27         ` Lance Richardson
2021-01-22 14:26           ` Lance Richardson
2021-01-25 12:14           ` Ferruh Yigit
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 03/22] net/dpaa: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 04/22] net/dpaa2: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 05/22] net/e1000: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 06/22] net/hns3: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 07/22] net/i40e: fix the jumbo frame flag condition Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 08/22] net/iavf: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 09/22] net/ice: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 10/22] net/ipn3ke: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 11/22] net/octeontx: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 12/22] net/octeontx2: fix the jumbo frame flag condition for mtu Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 13/22] net/qede: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 14/22] net/sfc: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 15/22] net/thunderx: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 16/22] net/ixgbe: fix the jumbo frame flag condition Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 17/22] net/cxgbe: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 18/22] net/axgbe: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 19/22] net/enetc: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 20/22] net/hinic: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 21/22] net/nfp: " Steve Yang
2021-01-18  7:04       ` [dpdk-dev] [PATCH v4 22/22] net/liquidio: " Steve Yang
2021-01-18 11:54       ` [dpdk-dev] [PATCH v4 00/22] fix rx packets dropped issue Ferruh Yigit
2021-01-14  9:45   ` [dpdk-dev] [PATCH v3 02/22] app/testpmd: fix max rx packet length for VLAN packets Steve Yang
2021-01-14  9:45   ` [dpdk-dev] [PATCH v3 03/22] net/dpaa: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-14 10:26     ` Hemant Agrawal
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 04/22] net/dpaa2: " Steve Yang
2021-01-14 10:27     ` Hemant Agrawal
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 05/22] net/e1000: " Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 06/22] net/hns3: " Steve Yang
2021-01-18  1:30     ` oulijun
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 07/22] net/i40e: fix the jumbo frame flag condition Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 08/22] net/iavf: " Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 09/22] net/ice: " Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 10/22] net/ipn3ke: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 11/22] net/octeontx: " Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 12/22] net/octeontx2: fix the jumbo frame flag condition for mtu Steve Yang
2021-01-14  9:46   ` [dpdk-dev] [PATCH v3 13/22] net/qede: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 14/22] net/sfc: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 15/22] net/thunderx: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 16/22] net/ixgbe: fix the jumbo frame flag condition Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 17/22] net/cxgbe: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 18/22] net/axgbe: fix the jumbo frame flag condition for mtu set Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 19/22] net/enetc: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 20/22] net/hinic: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 21/22] net/nfp: " Steve Yang
2021-01-14  9:47   ` [dpdk-dev] [PATCH v3 22/22] net/liquidio: " Steve Yang

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	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git