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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Ori Kam <orika@nvidia.com>, Gregory Etelson <getelson@nvidia.com>
Cc: "ajit.khaparde@broadcom.com" <ajit.khaparde@broadcom.com>,
	"andrew.rybchenko@oktetlabs.ru" <andrew.rybchenko@oktetlabs.ru>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	NBU-Contact-Thomas Monjalon <thomas@monjalon.net>,
	Slava Ovsiienko <viacheslavo@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH v2 1/2] ethdev: add packet integrity checks
Date: Tue, 13 Apr 2021 00:31:51 +0100
Message-ID: <253782ca-bdbf-5212-cdac-c9bb41de3290@intel.com> (raw)
In-Reply-To: <DM6PR12MB498734502CF6154CF5B9B768D6709@DM6PR12MB4987.namprd12.prod.outlook.com>

On 4/12/2021 8:26 PM, Ori Kam wrote:
> Hi Ferruh,
> 
>> -----Original Message-----
>> From: Ferruh Yigit <ferruh.yigit@intel.com>
>> Subject: Re: [PATCH v2 1/2] ethdev: add packet integrity checks
>>
>> On 4/11/2021 6:34 PM, Gregory Etelson wrote:
>>> From: Ori Kam <orika@nvidia.com>
>>>
>>> Currently, DPDK application can offload the checksum check,
>>> and report it in the mbuf.
>>>
>>> However, as more and more applications are offloading some or all
>>> logic and action to the HW, there is a need to check the packet
>>> integrity so the right decision can be taken.
>>>
>>> The application logic can be positive meaning if the packet is
>>> valid jump / do  actions, or negative if packet is not valid
>>> jump to SW / do actions (like drop)  a, and add default flow
>>> (match all in low priority) that will direct the miss packet
>>> to the miss path.
>>>
>>> Since currenlty rte_flow works in positive way the assumtion is
>>> that the postive way will be the common way in this case also.
>>>
>>> When thinking what is the best API to implement such feature,
>>> we need to considure the following (in no specific order):
>>> 1. API breakage.
>>> 2. Simplicity.
>>> 3. Performance.
>>> 4. HW capabilities.
>>> 5. rte_flow limitation.
>>> 6. Flexability.
>>>
>>> First option: Add integrity flags to each of the items.
>>> For example add checksum_ok to ipv4 item.
>>>
>>> Pros:
>>> 1. No new rte_flow item.
>>> 2. Simple in the way that on each item the app can see
>>> what checks are available.
>>>
>>> Cons:
>>> 1. API breakage.
>>> 2. increase number of flows, since app can't add global rule and
>>>      must have dedicated flow for each of the flow combinations, for example
>>>      matching on icmp traffic or UDP/TCP  traffic with IPv4 / IPv6 will
>>>      result in 5 flows.
>>>
>>> Second option: dedicated item
>>>
>>> Pros:
>>> 1. No API breakage, and there will be no for some time due to having
>>>      extra space. (by using bits)
>>> 2. Just one flow to support the icmp or UDP/TCP traffic with IPv4 /
>>>      IPv6.
>>> 3. Simplicity application can just look at one place to see all possible
>>>      checks.
>>> 4. Allow future support for more tests.
>>>
>>> Cons:
>>> 1. New item, that holds number of fields from different items.
>>>
>>> For starter the following bits are suggested:
>>> 1. packet_ok - means that all HW checks depending on packet layer have
>>>      passed. This may mean that in some HW such flow should be splited to
>>>      number of flows or fail.
>>> 2. l2_ok - all check flor layer 2 have passed.
>>> 3. l3_ok - all check flor layer 2 have passed. If packet doens't have
>>>      l3 layer this check shoudl fail.
>>> 4. l4_ok - all check flor layer 2 have passed. If packet doesn't
>>>      have l4 layer this check should fail.
>>> 5. l2_crc_ok - the layer 2 crc is O.K. it is possible that the crc will
>>>      be O.K. but the l3_ok will be 0. it is not possible that l2_crc_ok will
>>>      be 0 and the l3_ok will be 0.
>>> 6. ipv4_csum_ok - IPv4 checksum is O.K.
>>> 7. l4_csum_ok - layer 4 checksum is O.K.
>>> 8. l3_len_OK - check that the reported layer 3 len is smaller than the
>>>      packet len.
>>>
>>> Example of usage:
>>> 1. check packets from all possible layers for integrity.
>>>      flow create integrity spec packet_ok = 1 mask packet_ok = 1 .....
>>>
>>> 2. Check only packet with layer 4 (UDP / TCP)
>>>      flow create integrity spec l3_ok = 1, l4_ok = 1 mask l3_ok = 1 l4_ok = 1
>>>
>>
>> Hi Ori,
>>
>> Is the intention of the API just filtering, like apply some action to the
>> packets based on their integration status. Like drop packets their l2_crc
>> checksum failed? Here configuration is done by existing offload APIs.
>>
>> Or is the intention to configure the integration check on NIC, like to say
>> enable layer 2 checks, and do the action based on integration check status.
>>
> If I understand your question the first case is the one that this patch is targeting.
> meaning based on those bits route/apply actions to the packet while still in the
> HW.
> 
> This is not design to enable the queue status bits.
> In the use case suggestion by this patch, just like you said the app
> can decide to drop the packet before arriving to the queue, application may also
> use the mark + queue action to mark to the SW what is the issue with this packet.
> 
> I'm not sure I understand your comment about "here configuration is done by existing
> offload API" do you mean like the drop /  jump to table / any other rte_flow action?
>   
> 

I am asking because difference between device configuration and packet filtering 
seems getting more blurred in the flow API.

Currently L4 checksum offload is requested by application via setting 
'DEV_RX_OFFLOAD_TCP_CKSUM' (UDP/SCTP/...) offload flags. This is the way to 
configure HW.

Is the intention of this patch doing packet filtering after device configured 
with above offload API?

Or is the intention HW to be configured via flow API, like if "l4_ok = 1" is set 
in the rule, will it enable L4 checks first and do the filtering later?

If not what is the expected behavior when integration checks are not enabled 
when the rule is created?

>>
>>> Signed-off-by: Ori Kam <orika@nvidia.com>
>>> ---
>>> v2: fix compilation error
>>> ---
>>>    doc/guides/prog_guide/rte_flow.rst | 19 ++++++++++++
>>>    lib/librte_ethdev/rte_flow.h       | 47 ++++++++++++++++++++++++++++++
>>>    2 files changed, 66 insertions(+)
>>>
>>> diff --git a/doc/guides/prog_guide/rte_flow.rst
>> b/doc/guides/prog_guide/rte_flow.rst
>>> index e1b93ecedf..87ef591405 100644
>>> --- a/doc/guides/prog_guide/rte_flow.rst
>>> +++ b/doc/guides/prog_guide/rte_flow.rst
>>> @@ -1398,6 +1398,25 @@ Matches a eCPRI header.
>>>    - ``hdr``: eCPRI header definition (``rte_ecpri.h``).
>>>    - Default ``mask`` matches nothing, for all eCPRI messages.
>>>
>>> +Item: ``PACKET_INTEGRITY_CHECKS``
>>> +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>> +
>>> +Matches packet integrity.
>>> +
>>> +- ``level``: the encapsulation level that should be checked. level 0 means the
>>> +  default PMD mode (Can be inner most / outermost). value of 1 means
>> outermost
>>> +  and higher value means inner header. See also RSS level.
>>> +- ``packet_ok``: All HW packet integrity checks have passed based on the
>> max
>>> +  layer of the packet.
>>> +  layer of the packet.
>>> +- ``l2_ok``: all layer 2 HW integrity checks passed.
>>> +- ``l3_ok``: all layer 3 HW integrity checks passed.
>>> +- ``l4_ok``: all layer 3 HW integrity checks passed.
>>
>> s/layer 3/ layer 4/
>>
> Will fix.
> 
>>> +- ``l2_crc_ok``: layer 2 crc check passed.
>>> +- ``ipv4_csum_ok``: ipv4 checksum check passed.
>>> +- ``l4_csum_ok``: layer 4 checksum check passed.
>>> +- ``l3_len_ok``: the layer 3 len is smaller than the packet len.
>>> +
>>>    Actions
>>>    ~~~~~~~
>>>
>>> diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
>>> index 6cc57136ac..77471af2c4 100644
>>> --- a/lib/librte_ethdev/rte_flow.h
>>> +++ b/lib/librte_ethdev/rte_flow.h
>>> @@ -551,6 +551,15 @@ enum rte_flow_item_type {
>>>    	 * See struct rte_flow_item_geneve_opt
>>>    	 */
>>>    	RTE_FLOW_ITEM_TYPE_GENEVE_OPT,
>>> +
>>> +	/**
>>> +	 * [META]
>>> +	 *
>>> +	 * Matches on packet integrity.
>>> +	 *
>>> +	 * See struct rte_flow_item_integrity.
>>> +	 */
>>> +	RTE_FLOW_ITEM_TYPE_INTEGRITY,
>>>    };
>>>
>>>    /**
>>> @@ -1685,6 +1694,44 @@ rte_flow_item_geneve_opt_mask = {
>>>    };
>>>    #endif
>>>
>>> +__extension__
>>> +struct rte_flow_item_integrity {
>>> +	uint32_t level;
>>> +	/**< Packet encapsulation level the item should apply to.
>>> +	 * @see rte_flow_action_rss
>>> +	 */
>>> +	union {
>>> +		struct {
>>> +			uint64_t packet_ok:1;
>>> +			/** The packet is valid after passing all HW checks. */
>>> +			uint64_t l2_ok:1;
>>> +			/**< L2 layer is valid after passing all HW checks. */
>>> +			uint64_t l3_ok:1;
>>> +			/**< L3 layer is valid after passing all HW checks. */
>>> +			uint64_t l4_ok:1;
>>> +			/**< L4 layer is valid after passing all HW checks. */
>>> +			uint64_t l2_crc_ok:1;
>>> +			/**< L2 layer checksum is valid. */
>>> +			uint64_t ipv4_csum_ok:1;
>>> +			/**< L3 layer checksum is valid. */
>>> +			uint64_t l4_csum_ok:1;
>>> +			/**< L4 layer checksum is valid. */
>>> +			uint64_t l3_len_ok:1;
>>> +			/**< The l3 len is smaller than the packet len. */
>>
>> packet len?
>>
> Do you mean replace the l3_len_ok with packet len?

no, I was trying to ask what is "packet len" here? frame length, or mbuf buffer 
length, or something else?

> My only issue is that the check is comparing the l3 len to the packet len.
> 
> If you still think it is better to call it packet len, I'm also O.K with it.
> 
>>> +			uint64_t reserved:56;
>>> +		};
>>> +		uint64_t  value;
>>> +	};
>>> +};
>>> +
>>> +#ifndef __cplusplus
>>> +static const struct rte_flow_item_integrity
>>> +rte_flow_item_integrity_mask = {
>>> +	.level = 0,
>>> +	.value = 0,
>>> +};
>>> +#endif
>>> +
>>>    /**
>>>     * Matching pattern item definition.
>>>     *
>>>
> 


  reply	other threads:[~2021-04-12 23:32 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-05 18:04 [dpdk-dev] [PATCH] " Ori Kam
2021-04-06  7:39 ` Jerin Jacob
2021-04-07 10:32   ` Ori Kam
2021-04-07 11:01     ` Jerin Jacob
2021-04-07 22:15       ` Ori Kam
2021-04-08  7:44         ` Jerin Jacob
2021-04-11  4:12           ` Ajit Khaparde
2021-04-11  6:03             ` Ori Kam
2021-04-13 15:16     ` [dpdk-dev] [PATCH v3 0/2] " Gregory Etelson
2021-04-13 15:16       ` [dpdk-dev] [PATCH v3 1/2] ethdev: " Gregory Etelson
2021-04-13 15:16       ` [dpdk-dev] [PATCH v3 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-13 17:15         ` Ferruh Yigit
2021-04-14 12:56     ` [dpdk-dev] [PATCH v4 0/2] add packet integrity checks Gregory Etelson
2021-04-14 12:56       ` [dpdk-dev] [PATCH v4 1/2] ethdev: " Gregory Etelson
2021-04-14 13:27         ` Ferruh Yigit
2021-04-14 13:31           ` Ferruh Yigit
2021-04-14 12:57       ` [dpdk-dev] [PATCH v4 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-14 16:09     ` [dpdk-dev] [PATCH v5 0/2] add packet integrity checks Gregory Etelson
2021-04-14 16:09       ` [dpdk-dev] [PATCH v5 1/2] ethdev: " Gregory Etelson
2021-04-14 17:24         ` Ajit Khaparde
2021-04-15 15:10           ` Ori Kam
2021-04-15 15:25             ` Ajit Khaparde
2021-04-15 16:46         ` Thomas Monjalon
2021-04-16  7:43           ` Ori Kam
2021-04-18  8:15             ` Gregory Etelson
2021-04-18 18:00               ` Thomas Monjalon
2021-04-14 16:09       ` [dpdk-dev] [PATCH v5 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-14 16:26       ` [dpdk-dev] [PATCH v5 0/2] add packet integrity checks Ferruh Yigit
2021-04-18 15:51     ` [dpdk-dev] [PATCH v6 " Gregory Etelson
2021-04-18 15:51       ` [dpdk-dev] [PATCH v6 1/2] ethdev: " Gregory Etelson
2021-04-18 18:11         ` Thomas Monjalon
2021-04-18 19:24           ` Gregory Etelson
2021-04-18 21:30             ` Thomas Monjalon
2021-04-18 15:51       ` [dpdk-dev] [PATCH v6 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-19  8:29     ` [dpdk-dev] [PATCH v7 0/2] add packet integrity checks Gregory Etelson
2021-04-19  8:29       ` [dpdk-dev] [PATCH v7 1/2] ethdev: " Gregory Etelson
2021-04-19  8:47         ` Thomas Monjalon
2021-04-19  8:29       ` [dpdk-dev] [PATCH v7 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-19 11:20       ` [dpdk-dev] [PATCH v7 0/2] add packet integrity checks Ferruh Yigit
2021-04-19 12:08         ` Gregory Etelson
2021-04-19 12:44     ` [dpdk-dev] [PATCH v8 " Gregory Etelson
2021-04-19 12:44       ` [dpdk-dev] [PATCH v8 1/2] ethdev: " Gregory Etelson
2021-04-19 14:09         ` Ajit Khaparde
2021-04-19 16:34           ` Thomas Monjalon
2021-04-19 17:06             ` Ferruh Yigit
2021-04-19 12:44       ` [dpdk-dev] [PATCH v8 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-19 14:09         ` Ajit Khaparde
2021-04-08  8:04 ` [dpdk-dev] [PATCH] ethdev: add packet integrity checks Andrew Rybchenko
2021-04-08 11:39   ` Ori Kam
2021-04-09  8:08     ` Andrew Rybchenko
2021-04-11  6:42       ` Ori Kam
2021-04-11 17:30         ` Ori Kam
2021-04-11 17:34 ` [dpdk-dev] [PATCH v2 0/2] " Gregory Etelson
2021-04-11 17:34   ` [dpdk-dev] [PATCH v2 1/2] ethdev: " Gregory Etelson
2021-04-12 17:36     ` Ferruh Yigit
2021-04-12 19:26       ` Ori Kam
2021-04-12 23:31         ` Ferruh Yigit [this message]
2021-04-13  7:12           ` Ori Kam
2021-04-13  8:03             ` Ferruh Yigit
2021-04-13  8:18               ` Ori Kam
2021-04-13  8:30                 ` Ferruh Yigit
2021-04-13 10:21                   ` Ori Kam
2021-04-13 17:28                     ` Ferruh Yigit
2021-04-11 17:34   ` [dpdk-dev] [PATCH v2 2/2] app/testpmd: add support for integrity item Gregory Etelson
2021-04-12 17:49     ` Ferruh Yigit
2021-04-13  7:53       ` Ori Kam
2021-04-13  8:14         ` Ferruh Yigit
2021-04-13 11:36           ` Ori Kam

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