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Fri, 7 Feb 2025 11:39:19 +0000 From: Sunil Kumar Kori To: David Marchand , Jerin Jacob CC: "dev@dpdk.org" , Chengwen Feng , Kevin Laatz , Bruce Richardson , Tyler Retzlaff , Andre Muezerie , Thomas Monjalon , Stephen Hemminger Subject: RE: [EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior in register Thread-Topic: [EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior in register Thread-Index: AQHbeT1Dho/CKfquMEm+i570TykqybM7tx9A Date: Fri, 7 Feb 2025 11:39:19 +0000 Message-ID: References: <20250124161408.310581-1-david.marchand@redhat.com> <20250130145849.82003-1-david.marchand@redhat.com> <20250130145849.82003-3-david.marchand@redhat.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: CO6PR18MB3860:EE_|MW4PR18MB5063:EE_ x-ms-office365-filtering-correlation-id: 4b666510-c71e-4a64-53b8-08dd476c0f3b x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi David, I will look into this at earliest and provide feedback. Thanks From: David Marchand Sent: Friday, February 7, 2025 2:20 PM To: Jerin Jacob ; Sunil Kumar Kori Cc: dev@dpdk.org; Chengwen Feng ; Kevin Laatz ; Bruce Richardson ; Tyler R= etzlaff ; Andre Muezerie ; Thomas Monjalon ; Stephen Hemminger Subject: [EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior in reg= ister Hello Jerin, Sunil, On Thu, Jan 30, 2025 at 3:=E2=80=8A59 PM David Marchand= wrote: > > Register= ing a tracepoint handler was resulting so far in undefined > behavior at ru= ntime. > > The RTE_TRACE_POINT_REGISTER() Hello Jerin, Sunil, On Thu, Jan 30, 2025 at 3:59=E2=80=AFPM David Marchand > wrote: > > Registering a tracepoint handler was resulting so far in undefined > behavior at runtime. > > The RTE_TRACE_POINT_REGISTER() macro was casting the tracepoint handler > (which expects arguments) to a void (*)(void). > At runtime, calling this handler while registering resulted in > reading the current stack with no relation to this function prototype. > > Instead, declare an additional inline _register() handler for each > tracepoint and make sure that the emitting macros in > rte_trace_point_register.h only work on arguments name and type. > > The original tracepoint handler prototype is adjusted by adding a > __rte_unused for each argument (since emitting macros do nothing > with them). > This last part introduces an implementation limit of 15 arguments. > > With this change in place, the workaround in dmadev tracepoints can be > removed. > > Signed-off-by: David Marchand > Can I have your opinion and review on this patch? Thanks. -- David Marchand --_000_CO6PR18MB386009DC96D52BF64C1FFFE6B4F12CO6PR18MB3860namp_ Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi David,

 

I will look into th= is at earliest and provide feedback.

 

Thanks

 

From: David Marchand <david.march= and@redhat.com>
Sent: Friday, February 7, 2025 2:20 PM
To: Jerin Jacob <jerinj@marvell.com>; Sunil Kumar Kori <sko= ri@marvell.com>
Cc: dev@dpdk.org; Chengwen Feng <fengchengwen@huawei.com>; Kev= in Laatz <kevin.laatz@intel.com>; Bruce Richardson <bruce.richards= on@intel.com>; Tyler Retzlaff <roretzla@linux.microsoft.com>; Andr= e Muezerie <andremue@linux.microsoft.com>; Thomas Monjalon <thomas@monjalon.net>; Stephen Hemminger <stephen@networkplumber.= org>
Subject: [EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior= in register

 

Hello Jerin, Sunil, On Thu, Jan 30, 2025 at 3:<= /span>=E2=80=8A59 PM David Marchand <david.=E2=80=8Amarchand@=E2=80=8A= redhat.=E2=80= =8Acom> wrote: > > Registering a tracepoint handler was resulting so far in = undefined > behavior at runtime. > > The RTE_TRACE_POINT_REGISTER(= )

Hello Jerin, Sunil,

 


On Thu, Jan 30, 2025 at 3:59=E2=80=AFPM David Marchand


<david.marchand@redhat.=
com> wrote:


> 


> Registering a tracepoint handler was resulting so far in undefined=



> behavior at runtime.


> 


> The RTE_TRACE_POINT_REGISTER() macro was casting the tracepoint ha=
ndler


> (which expects arguments) to a void (*)(void).

> At runtime, calling this handler while registering resulted in


> reading the current stack with no relation to this function protot=
ype.


> 


> Instead, declare an additional inline _register() handler for each=



> tracepoint and make sure that the emitting macros in


> rte_trace_point_register.h only work on arguments name and type.


> 


> The original tracepoint handler prototype is adjusted by adding a<=
o:p>


> __rte_unused for each argument (since emitting macros do nothing


> with them).


> This last part introduces an implementation limit of 15 arguments.=



> 


> With this change in place, the workaround in dmadev tracepoints ca=
n be


> removed.


> 


> Signed-off-by: David Marchand <david.marchand@redhat.com>


 


Can I have your opinion and review on this patch?

 


Thanks.


 


 


-- 


David Marchand


 
--_000_CO6PR18MB386009DC96D52BF64C1FFFE6B4F12CO6PR18MB3860namp_--