Dpdk-dev,rfc Lib/librte_ether: Add A Return Value For Mac

1. Dpdk-dev Rfc Lib/librte_ether: Add A Return Value For Mac Free
2. Dpdk-dev Rfc Lib/librte_ether: Add A Return Value For Machine

This patch provides the initial implementation of the AES-NI multi-buffer based crypto poll mode driver using DPDK's new cryptodev framework. This PMD is dependent on Intel's multibuffer library, see the whitepaper 'Fast Multi-buffer IPsec Implementations on Intel® Architecture Processors', see ref 1 for details on the library's design and ref 2 to download the library itself.

20, 2017, 9:51 a.m. The rteethtxburst function in the file Rteethdev.h is invoked to transmit output packets on the output queue for DPDK applications as follows. Static inline uint16t rteethtxburst(uint8t portid, uint16t queueid, struct rtembuf.txpkts, uint16t nbpkts); Note: The fourth parameter nbpkts: The number of packets to transmit. The rteethtxburst function returns the number of packets it actually sent.

The return value equal to.nbpkts. means that all packets have been sent, and this is likely to signify that other output packets could be immediately transmitted again. Applications that implement a 'send as many packets to transmit as possible' policy can check this specific case and keep invoking the rteethtxburst function until a value less than.nbpkts. is returned. When you call TX only once in rteethtxburst, you may get different behaviors from different PMDs.

• The rte_eth_tx_burst() function in the file Rte_ethdev.h is invoked to transmit output packets on the output queue for DPDK applications as follows.
• But there is another issue that I considered just after left for home today:). The ether_addr can be unaligned in memory easily (as it comes in the Ethernet frame).

One problem that every DPDK user has to face is that they need to take the policy into consideration at the app- lication level when using any specific PMD to send the packets whether or not it is necessary, which brings usage complexities and makes DPDK users easily confused since they have to learn the details on TX function limit of specific PMDs and have to handle the different return value: the number of packets transmitted successfully for various PMDs. Some PMDs Tx func- tions have a limit of sending at most 32 packets for every invoking, some PMDs have another limit of at most 64 packets once, another ones have imp- lemented to send as many packets to transmit as possible, etc. This will easily cause wrong usage for DPDK users.

This patch proposes to implement the above policy in DPDK lib in order to simplify the application implementation and avoid the incorrect invoking as well. So, DPDK Users don't need to consider the implementation policy and to write duplicated code at the application level again when sending packets. In addition to it, the users don't need to know the difference of specific PMD TX and can transmit the arbitrary number of packets as they expect when invoking TX API rteethtxburst, then check the return value to get the number of packets actually sent. How to implement the policy in DPDK lib? Two solutions are proposed below. Solution 1: Implement the wrapper functions to remove some limits for each specific PMDs as i40exmitpktssimple and ixgbexmitpktssimple do like that.

Solution 2: Implement the policy in the function rteethtxburst at the ethdev lay- er in a more consistent batching way. Make best effort to send.nbpkts. packets with bursts of no more than 32 by default since many DPDK TX PMDs are using this max TX burst size(32). In addition, one data member which defines the max TX burst size such as 'uint16t maxtxburstpkts;'will be added to rteethdevdata, which drivers can override if they work with bursts of 64 or other NB(thanks for Bruce 's suggestion). This can reduce the performance impacting to the lowest limit. I prefer the latter between the 2 solutions because it makes DPDK code more consistent and easier and avoids to write too much duplicate logic in DPDK source code.

In addition, I think no or a little performance drop is brought by solution 2. But ABI change will be introduced. In fact, the current rteethrxburst function is using the similar mechanism and faces the same problem as rteethtxburst. Static inline uint16t rteethrxburst(uint8t portid, uint16t queueid, struct rtembuf.rxpkts, const uint16t nbpkts); Applications are responsible of implementing the policy 'retrieve as many received packets as possible', and check this specific case and keep invoking the rteethrxburst function until a value less than.nbpkts.

is returned. The patch proposes to apply the above method to rteethrxburst as well. In summary, The purpose of the RFC makes the job easier and more simple for driver writers and avoids to write too much duplicate code at the applica- tion level. Signed-off-by: Zhiyong Yang - lib/librteether/rteethdev.h 41 - 1 file changed, 39 insertions(+), 2 deletions(-) Comments. 20, 2017, 11:24 a.m.

From: Andrew Rybchenko mailto:arybchenko@solarflare.com Sent: Friday, January 20, 2017 10:26 AM To: Yang, Zhiyong; dev@dpdk.org Cc: thomas.monjalon@6wind.com; Richardson, Bruce; Ananyev, Konstantin Subject: Re: dpdk-dev RFC lib/librteether: consistent PMD batching behavior On 12:51 PM, Zhiyong Yang wrote: The rteethtxburst function in the file Rteethdev.h is invoked to transmit output packets on the output queue for DPDK applications as follows. static inline uint16t rteethtxburst(uint8t portid, uint16t queueidstruct rtembuf.txpkts, uint16t nbpkts); Note: The fourth parameter nbpkts: The number of packets to transmit. The rteethtxburst function returns the number of packets it actually sent. The return value equal to.nbpkts. means that all packets have been sent, and this is likely to signify that other output packets could be immediately transmitted again. Applications that implement a 'send as many packets to transmit as possible' policy can check this specific case and keep invoking the rteethtxburst function until a value less than.nbpkts.

is returned. When you call TX only once in rteethtxburst, you may get different behaviors from different PMDs. One problem that every DPDK user has to face is that they need to take the policy into consideration at the app- lication level when using any specific PMD to send the packets whether or not it is necessary, which brings usage complexities and makes DPDK users easily confused since they have to learn the details on TX function limit of specific PMDs and have to handle the different return value: the number of packets transmitted successfully for various PMDs.

Some PMDs Tx func- tions have a limit of sending at most 32 packets for every invoking, some PMDs have another limit of at most 64 packets once, another ones have imp- lemented to send as many packets to transmit as possible, etc. This will easily cause wrong usage for DPDK users. This patch proposes to implement the above policy in DPDK lib in order to simplify the application implementation and avoid the incorrect invoking as well.

So, DPDK Users don't need to consider the implementation policy and to write duplicated code at the application level again when sending packets. In addition to it, the users don't need to know the difference of specific PMD TX and can transmit the arbitrary number of packets as they expect when invoking TX API rteethtxburst, then check the return value to get the number of packets actually sent.

How to implement the policy in DPDK lib? Two solutions are proposed below. Solution 1: Implement the wrapper functions to remove some limits for each specific PMDs as i40exmitpktssimple and ixgbexmitpktssimple do like that. IMHO, the solution is a bit better since it:  1. Does not affect other PMDs at all  2.

Could be a bit faster for the PMDs which require it since has no indirect function call on each iteration  3. No ABI change I also would prefer solution number 1 for the reasons outlined by Andrew above. Also, IMO current limitation for number of packets to TX in some Intel PMD TX routines are sort of artificial: - they are not caused by any real HW limitations - avoiding them at PMD level shouldn't cause any performance or functional degradation.

So I don't see any good reason why instead of fixing these limitations in our own PMDs we are trying to push them to the upper (rteethdev) layer. Konstantin Solution 2: Implement the policy in the function rteethtxburst at the ethdev lay- er in a more consistent batching way. Make best effort to send.nbpkts. packets with bursts of no more than 32 by default since many DPDK TX PMDs are using this max TX burst size(32).

In addition, one data member which defines the max TX burst size such as 'uint16t maxtxburstpkts;'will be added to rteethdevdata, which drivers can override if they work with bursts of 64 or other NB(thanks for Bruce 's suggestion). This can reduce the performance impacting to the lowest limit.

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I see no noticeable difference in performance, so don't mind if this is finally choosen. Just be sure that you update all PMDs to set reasonable default values, or may be even better, set UINT16MAX in generic place - 0 is a bad default here. (Lost few seconds wondering why nothing is sent and cannot stop) I prefer the latter between the 2 solutions because it makes DPDK code more consistent and easier and avoids to write too much duplicate logic in DPDK source code. In addition, I think no or a little performance drop is brought by solution 2.

But ABI change will be introduced. In fact, the current rteethrxburst function is using the similar mechanism and faces the same problem as rteethtxburst. static inline uint16t rteethrxburst(uint8t portid, uint16t queueidstruct rtembuf.rxpkts, const uint16t nbpkts); Applications are responsible of implementing the policy 'retrieve as many received packets as possible', and check this specific case and keep invoking the rteethrxburst function until a value less than.nbpkts. is returned. The patch proposes to apply the above method to rteethrxburst as well.

In summary, The purpose of the RFC makes the job easier and more simple for driver writers and avoids to write too much duplicate code at the applica- tion level. 21, 2017, 4:13 a.m. From: Andrew Rybchenko mailto:arybchenko@solarflare.com Sent: Friday, January 20, 2017 6:26 PM To: Yang, Zhiyong; dev@dpdk.org Cc: thomas.monjalon@6wind.com; Richardson, Bruce; Ananyev, Konstantin Subject: Re: dpdk-dev RFC lib/librteether: consistent PMD batching behavior On 12:51 PM, Zhiyong Yang wrote: The rteethtxburst function in the file Rteethdev.h is invoked to transmit output packets on the output queue for DPDK applications as follows. Static inline uint16t rteethtxburst(uint8t portid, uint16t queueid, struct rtembuf.txpkts, uint16t nbpkts); Note: The fourth parameter nbpkts: The number of packets to transmit.

The rteethtxburst function returns the number of packets it actually sent. Ktjj krei kjff on twitter: food pantry now open for mac. The return value equal to.nbpkts. means that all packets have been sent, and this is likely to signify that other output packets could be immediately transmitted again.

Applications that implement a 'send as many packets to transmit as possible' policy can check this specific case and keep invoking the rteethtxburst function until a value less than.nbpkts. is returned. When you call TX only once in rteethtxburst, you may get different behaviors from different PMDs. One problem that every DPDK user has to face is that they need to take the policy into consideration at the app- lication level when using any specific PMD to send the packets whether or not it is necessary, which brings usage complexities and makes DPDK users easily confused since they have to learn the details on TX function limit of specific PMDs and have to handle the different return value: the number of packets transmitted successfully for various PMDs. Some PMDs Tx func- tions have a limit of sending at most 32 packets for every invoking, some PMDs have another limit of at most 64 packets once, another ones have imp- lemented to send as many packets to transmit as possible, etc. This will easily cause wrong usage for DPDK users. This patch proposes to implement the above policy in DPDK lib in order to simplify the application implementation and avoid the incorrect invoking as well.

So, DPDK Users don't need to consider the implementation policy and to write duplicated code at the application level again when sending packets. In addition to it, the users don't need to know the difference of specific PMD TX and can transmit the arbitrary number of packets as they expect when invoking TX API rteethtxburst, then check the return value to get the number of packets actually sent. How to implement the policy in DPDK lib?

Two solutions are proposed below. Solution 1: Implement the wrapper functions to remove some limits for each specific PMDs as i40exmitpktssimple and ixgbexmitpktssimple do like that. IMHO, the solution is a bit better since it: 1. Does not affect other PMDs at all 2.

Could be a bit faster for the PMDs which require it since has no indirect function call on each iteration 3. No ABI change Solution 2: Implement the policy in the function rteethtxburst at the ethdev lay- er in a more consistent batching way. Make best effort to send.nbpkts.

packets with bursts of no more than 32 by default since many DPDK TX PMDs are using this max TX burst size(32). In addition, one data member which defines the max TX burst size such as 'uint16t maxtxburstpkts;'will be added to rteethdevdata, which drivers can override if they work with bursts of 64 or other NB(thanks for Bruce 's suggestion). This can reduce the performance impacting to the lowest limit. I see no noticeable difference in performance, so don't mind if this is finally choosen.

Just be sure that you update all PMDs to set reasonable default values, or may be even better, set UINT16MAX in generic place - 0 is a bad default here. (Lost few seconds wondering why nothing is sent and cannot stop) Agree with you, 0 is not a good default value. I recommend 32 by default here, of course, The driver writers Can configure it as they expect before starting to sending packets.

Dpdk-dev Rfc Lib/librte_ether: Add A Return Value For Mac Free

7, 2017, 7:50 a.m. Hi, Adrien: Sorry for the late reply due to Chinese new year.

Dpdk-dev Rfc Lib/librte_ether: Add A Return Value For Machine

May 3, 2017, 11:21 a.m. This patch adds following: 1. Option to configure the mac address during create 2.

Inform usespace, if mac address is being changed in linux Signed-off-by: Hemant Agrawal -./linuxapp/eal/include/exec-env/rteknicommon.h 3 lib/librteeal/linuxapp/kni/knimisc.c 6 - lib/librteeal/linuxapp/kni/kninet.c 15 - lib/librtekni/rtekni.c 12 lib/librtekni/rtekni.h 8 5 files changed, 41 insertions(+), 3 deletions(-) Comments. 28, 2017, 10:31 p.m. On 5/3/2017 4:21 AM, Hemant Agrawal wrote: This patch adds following: 1. Option to configure the mac address during create 2. Inform usespace, if mac address is being changed in linux Signed-off-by: Hemant Agrawal Hi Hemant, This RFC is waiting in patchwork for a while, is there plan to send a v1? I will mark patchset as RFC in patchwork.

As far as I can follow latest patchset status is: provide initial value and add capability to change 1/5: MAC address 2/5: promisc mode 3/5: MTU There is a change request for 1/5, other two looks OK. But for all three the action done in kniops, which means application needs to implement these features. Not sure about pushing these common tasks to application, instead of all applications implement same thing, does it make sense to implement them in kni library? 4/5: add gsosize info Nak because it uses mbuf field with another meaning 5/5: Add cleanup fix for multi process Multi process support is not supported in KNI at first place, if there is a need first it needs to be introduced and tested. Thanks, ferruh.

30, 2017, 6:44 a.m. On 4:01 AM, Ferruh Yigit wrote: On 5/3/2017 4:21 AM, Hemant Agrawal wrote: This patch adds following: 1.

Option to configure the mac address during create 2. Inform usespace, if mac address is being changed in linux Signed-off-by: Hemant Agrawal Hi Hemant, Hi Ferruh, Thanks for looking into it. It is a just a co-incidence that I started working on these again yesterday:) I plan to send the updated patch along with application change in next few days. This RFC is waiting in patchwork for a while, is there plan to send a v1? I will mark patchset as RFC in patchwork.

As far as I can follow latest patchset status is: provide initial value and add capability to change 1/5: MAC address 2/5: promisc mode 3/5: MTU There is a change request for 1/5, other two looks OK. I am taking care of comments.

But for all three the action done in kniops, which means application needs to implement these features. Not sure about pushing these common tasks to application, instead of all applications implement same thing, does it make sense to implement them in kni library? I don't think it is a good thing to implement them in library itself. Libary may not know about the equivalent Ethernet port and it may be a logical kni port also. 4/5: add gsosize info Nak because it uses mbuf field with another meaning ok, I will try to find other means. 5/5: Add cleanup fix for multi process Multi process support is not supported in KNI at first place, if there is a need first it needs to be introduced and tested.

Ok Thanksferruh Patch.