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From: David Marchand <david.marchand@redhat.com>
To: Phil Yang <Phil.Yang@arm.com>,
	Olivier Matz <olivier.matz@6wind.com>,
	 Dodji Seketeli <dodji@redhat.com>, Ray Kinsella <mdr@ashroe.eu>
Cc: dev <dev@dpdk.org>,
	Stephen Hemminger <stephen@networkplumber.org>,
	 David Christensen <drc@linux.vnet.ibm.com>,
	 Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>, nd <nd@arm.com>,
	 Aaron Conole <aconole@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v4 1/2] mbuf: use C11 atomic built-ins for refcnt operations
Date: Thu, 16 Jul 2020 13:30:09 +0200
Message-ID: <CAJFAV8x42GYGf-OL=WBKzeP5Sfiu0X=zRGa3cWct1fWSCTiUgw@mail.gmail.com> (raw)
In-Reply-To: <VE1PR08MB464036DF852519C655A31222E97F0@VE1PR08MB4640.eurprd08.prod.outlook.com>

On Thu, Jul 16, 2020 at 6:16 AM Phil Yang <Phil.Yang@arm.com> wrote:
>
> David Marchand <david.marchand@redhat.com> writes:
>
> > Subject: Re: [PATCH v4 1/2] mbuf: use C11 atomic built-ins for refcnt
> > operations
> >
> > On Thu, Jul 9, 2020 at 5:59 PM Phil Yang <phil.yang@arm.com> wrote:
> > >
> > > Use C11 atomic built-ins with explicit ordering instead of rte_atomic
> > > ops which enforce unnecessary barriers on aarch64.
> > >
> > > Signed-off-by: Phil Yang <phil.yang@arm.com>
> > > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > > ---
> > > v4:
> > > 1. Add union for refcnt_atomic and refcnt in rte_mbuf_ext_shared_info
> > > to avoid ABI breakage. (Olivier)
> > > 2. Add notice of refcnt_atomic deprecation. (Honnappa)
> >
> > v4 does not pass the checks (in both my env, and Travis).
> > https://travis-ci.com/github/ovsrobot/dpdk/jobs/359393389#L2405
>
> I think we need an exception in 'libabigail.abignore' for this change.
> Is that OK with you?

Testing the series with libabigail 1.7.0:

Functions changes summary: 0 Removed, 1 Changed (6 filtered out), 0
Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

1 function with some indirect sub-type change:

  [C]'function unsigned int rte_reorder_drain(rte_reorder_buffer*,
rte_mbuf**, unsigned int)' at rte_reorder.c:367:1 has some indirect
sub-type changes:
    parameter 2 of type 'rte_mbuf**' has sub-type changes:
      in pointed to type 'rte_mbuf*':
        in pointed to type 'struct rte_mbuf' at rte_mbuf_core.h:469:1:
          type size hasn't changed
          1 data member changes (1 filtered):
           type of 'rte_mbuf_ext_shared_info* rte_mbuf::shinfo' changed:
             in pointed to type 'struct rte_mbuf_ext_shared_info' at
rte_mbuf_core.h:679:1:
               type size hasn't changed
               1 data member change:
                data member rte_atomic16_t
rte_mbuf_ext_shared_info::refcnt_atomic at offset 128 (in bits) became
anonymous data member 'union {rte_atomic16_t refcnt_atomic; uint16_t
refcnt;}'



Error: ABI issue reported for 'abidiff --suppr
/home/dmarchan/dpdk/devtools/../devtools/libabigail.abignore
--no-added-syms --headers-dir1
/home/dmarchan/abi/v20.05/build-gcc-static/usr/local/include
--headers-dir2 /home/dmarchan/builds/build-gcc-static/install/usr/local/include
/home/dmarchan/abi/v20.05/build-gcc-static/dump/librte_reorder.dump
/home/dmarchan/builds/build-gcc-static/install/dump/librte_reorder.dump'

ABIDIFF_ABI_CHANGE, this change requires a review (abidiff flagged
this as a potential issue).



We will have no other update on mbuf for 20.08, so the following rule
can do the job for 20.08 and we will remove it in 20.11.

diff --git a/devtools/libabigail.abignore b/devtools/libabigail.abignore
index daa4631bf..b35f91257 100644
--- a/devtools/libabigail.abignore
+++ b/devtools/libabigail.abignore
@@ -52,6 +52,10 @@
 [suppress_type]
         type_kind = struct
         name = rte_epoll_event
+; Ignore updates of rte_mbuf_ext_shared_info
+[suppress_type]
+        type_kind = struct
+        name = rte_mbuf_ext_shared_info

 ;;;;;;;;;;;;;;;;;;;;;;
 ; Temporary exceptions till DPDK 20.11


Olivier, Dodji, Ray?


-- 
David Marchand


  reply	other threads:[~2020-07-16 11:30 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11 10:26 [dpdk-dev] [PATCH] mbuf: use c11 atomics " Phil Yang
2020-07-03 15:38 ` David Marchand
2020-07-06  8:03   ` Phil Yang
2020-07-07 10:10 ` [dpdk-dev] [PATCH v2] mbuf: use C11 " Phil Yang
2020-07-07 17:13   ` Stephen Hemminger
2020-07-08  4:48     ` Phil Yang
2020-07-08 11:43       ` Olivier Matz
2020-07-09  9:52         ` Phil Yang
2020-07-08  5:11   ` Phil Yang
2020-07-08 11:44   ` Olivier Matz
2020-07-09 10:00     ` Phil Yang
2020-07-09 10:10   ` [dpdk-dev] [PATCH v3] mbuf: use C11 atomic built-ins " Phil Yang
2020-07-09 11:03     ` Olivier Matz
2020-07-09 13:00       ` Phil Yang
2020-07-09 13:31         ` Honnappa Nagarahalli
2020-07-09 14:10           ` Phil Yang
2020-07-09 15:58     ` [dpdk-dev] [PATCH v4 1/2] " Phil Yang
2020-07-09 15:58       ` [dpdk-dev] [PATCH v4 2/2] doc: announce deprecation of refcnt atomic member Phil Yang
2020-07-10  2:55         ` Ruifeng Wang
2020-07-13 15:54           ` Phil Yang
2020-07-14 10:41         ` Ananyev, Konstantin
2020-07-15 12:29       ` [dpdk-dev] [PATCH v4 1/2] mbuf: use C11 atomic built-ins for refcnt operations David Marchand
2020-07-15 12:49         ` Aaron Conole
2020-07-15 16:29         ` Phil Yang
2020-07-16  4:16         ` Phil Yang
2020-07-16 11:30           ` David Marchand [this message]
2020-07-16 13:20             ` Dodji Seketeli
2020-07-16 19:11               ` David Marchand
2020-07-17  4:41                 ` Phil Yang
2020-07-16 11:32       ` Olivier Matz
2020-07-17  4:36       ` [dpdk-dev] [PATCH v5 1/2] mbuf: use C11 atomic builtins " Phil Yang
2020-07-17  4:36         ` [dpdk-dev] [PATCH v5 2/2] doc: announce deprecation of refcnt atomic member Phil Yang
2020-07-17 11:45           ` Olivier Matz
2020-07-17 14:32           ` David Marchand
2020-07-17 14:35             ` David Marchand
2020-07-17 16:06               ` Ananyev, Konstantin
2020-07-17 16:20               ` Bruce Richardson
2020-07-21  8:35                 ` David Marchand
2020-07-21  8:48                   ` Ananyev, Konstantin
2020-07-21  8:37         ` [dpdk-dev] [PATCH v5 1/2] mbuf: use C11 atomic builtins for refcnt operations David Marchand

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