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From: Olivier Matz <olivier.matz@6wind.com>
To: Slava Ovsiienko <viacheslavo@mellanox.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
	"dev@dpdk.org" <dev@dpdk.org>, Matan Azrad <matan@mellanox.com>,
	Raslan Darawsheh <rasland@mellanox.com>,
	Ori Kam <orika@mellanox.com>,
	Shahaf Shuler <shahafs@mellanox.com>,
	"thomas@mellanox.net" <thomas@mellanox.net>
Subject: Re: [dpdk-dev] [PATCH v5 1/5] mbuf: introduce routine to get private mbuf pool flags
Date: Tue, 21 Jan 2020 15:01:57 +0100	[thread overview]
Message-ID: <20200121140157.GP14387@glumotte.dev.6wind.com> (raw)
In-Reply-To: <AM4PR05MB3265B9EFA3CE694BE7F63F0BD20D0@AM4PR05MB3265.eurprd05.prod.outlook.com>

On Tue, Jan 21, 2020 at 09:13:48AM +0000, Slava Ovsiienko wrote:
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of Slava Ovsiienko
> > Sent: Tuesday, January 21, 2020 10:24
> > To: Olivier Matz <olivier.matz@6wind.com>
> > Cc: Stephen Hemminger <stephen@networkplumber.org>; dev@dpdk.org;
> > Matan Azrad <matan@mellanox.com>; Raslan Darawsheh
> > <rasland@mellanox.com>; Ori Kam <orika@mellanox.com>; Shahaf Shuler
> > <shahafs@mellanox.com>; thomas@mellanox.net
> > Subject: Re: [dpdk-dev] [PATCH v5 1/5] mbuf: introduce routine to get private
> > mbuf pool flags
> > 
> > > -----Original Message-----
> > > From: Olivier Matz <olivier.matz@6wind.com>
> > > Sent: Tuesday, January 21, 2020 10:14
> > > To: Slava Ovsiienko <viacheslavo@mellanox.com>
> > > Cc: Stephen Hemminger <stephen@networkplumber.org>; dev@dpdk.org;
> > > Matan Azrad <matan@mellanox.com>; Raslan Darawsheh
> > > <rasland@mellanox.com>; Ori Kam <orika@mellanox.com>; Shahaf Shuler
> > > <shahafs@mellanox.com>; thomas@mellanox.net
> > > Subject: Re: [PATCH v5 1/5] mbuf: introduce routine to get private
> > > mbuf pool flags
> > >
> > > On Tue, Jan 21, 2020 at 08:00:17AM +0000, Slava Ovsiienko wrote:
> > > > > -----Original Message-----
> > > > > From: Stephen Hemminger <stephen@networkplumber.org>
> > > > > Sent: Monday, January 20, 2020 22:44
> > > > > To: Slava Ovsiienko <viacheslavo@mellanox.com>
> > > > > Cc: dev@dpdk.org; Matan Azrad <matan@mellanox.com>; Raslan
> > > Darawsheh
> > > > > <rasland@mellanox.com>; Ori Kam <orika@mellanox.com>; Shahaf
> > > > > Shuler <shahafs@mellanox.com>; olivier.matz@6wind.com;
> > > thomas@mellanox.net
> > > > > Subject: Re: [PATCH v5 1/5] mbuf: introduce routine to get private
> > > > > mbuf pool flags
> > > > >
> > > > > On Mon, 20 Jan 2020 17:23:19 +0000 Viacheslav Ovsiienko
> > > > > <viacheslavo@mellanox.com> wrote:
> > > > >
> > > > > > The routine rte_pktmbuf_priv_flags is introduced to fetch the
> > > > > > flags from the mbuf memory pool private structure in unified fashion.
> > > > > >
> > > > > > Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> > > > > > Acked-by: Olivier Matz <olivier.matz@6wind.com>
> > > > > > ---
> > > > > >  lib/librte_mbuf/rte_mbuf.h | 17 +++++++++++++++++
> > > > > >  1 file changed, 17 insertions(+)
> > > > > >
> > > > > > diff --git a/lib/librte_mbuf/rte_mbuf.h
> > > > > > b/lib/librte_mbuf/rte_mbuf.h index 2d4bda2..9b0691d 100644
> > > > > > --- a/lib/librte_mbuf/rte_mbuf.h
> > > > > > +++ b/lib/librte_mbuf/rte_mbuf.h
> > > > > > @@ -306,6 +306,23 @@ struct rte_pktmbuf_pool_private {
> > > > > >  	uint32_t flags; /**< reserved for future use. */  };
> > > > > >
> > > > > > +/**
> > > > > > + * Return the flags from private data in an mempool structure.
> > > > > > + *
> > > > > > + * @param mp
> > > > > > + *   A pointer to the mempool structure.
> > > > > > + * @return
> > > > > > + *   The flags from the private data structure.
> > > > > > + */
> > > > > > +static inline uint32_t
> > > > > > +rte_pktmbuf_priv_flags(struct rte_mempool *mp) {
> > > > > > +	struct rte_pktmbuf_pool_private *mbp_priv;
> > > > > > +
> > > > > > +	mbp_priv = (struct rte_pktmbuf_pool_private
> > > > > *)rte_mempool_get_priv(mp);
> > > > > > +	return mbp_priv->flags;
> > > > > > +}
> > > > > > +
> > > > > >  #ifdef RTE_LIBRTE_MBUF_DEBUG
> > > > > >
> > > > > >  /**  check mbuf type in debug mode */
> > > > >
> > > > > Looks fine, but a couple of minor suggestions.
> > > > >
> > > > >
> > > > > Since this doesn't modify the mbuf, the arguments should be const.
> > > > > Since rte_mempool_get_priv returns void *, the cast is unnecessary.
> > > >
> > > > rte_mempool_get_priv() does not expect "const", so adding "const" is
> > > > a bit problematic, and we should not change the
> > > > rte_mempool_get_priv()
> > > prototype.
> > > > Do you think we should take private structure pointer directly from
> > > > the pool structure instead of calling rte_mempool_get_priv() ?
> > >
> > > I'm not sure it would work. The problem is that to get the priv, we do
> > > pool_ptr + offset. So if we want to remove the const, we'll have to do
> > > a cast to "unconst". Not sure it is worth doing it.
> > >
> > > Thanks
> > > Olivier
> > OK, I'll just remove not necessary (struct rte_pktmbuf_pool_private*) cast and
> > will not introduce const qualifier for the parameter.
> > 
> > With best regards, Slava
> I've checked the rte_mempool_get_priv() usage - in all header files there
> are the type casts. The "rte_mbuf.h" contains the rte_pktmbuf_priv_size() and
> rte_pktmbuf_data_room_size(), both provide the cast.  What is the reason?
> C++ compatibility? Should we remove the cast in rte_pktmbuf_priv_flags()?

Removing the cast will certainly break C++ code using this header.
There is a similar case in commit a2ff2827dc84 ("mbuf: fix C++ build on
void pointer cast")

In my opinion it can stay as it is now.

  reply	other threads:[~2020-01-21 14:02 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-18  9:50 [dpdk-dev] [RFC v20.20] mbuf: introduce pktmbuf pool with pinned external buffers Shahaf Shuler
2019-11-18 16:09 ` Stephen Hemminger
2020-01-10 17:56 ` [dpdk-dev] [PATCH 0/4] " Viacheslav Ovsiienko
2020-01-10 17:56   ` [dpdk-dev] [PATCH 1/4] mbuf: detach mbuf with pinned external buffer Viacheslav Ovsiienko
2020-01-10 18:23     ` Stephen Hemminger
2020-01-13 17:07       ` Slava Ovsiienko
2020-01-14  7:19       ` Slava Ovsiienko
2020-01-10 17:57   ` [dpdk-dev] [PATCH 2/4] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-10 17:57   ` [dpdk-dev] [PATCH 3/4] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-10 17:57   ` [dpdk-dev] [PATCH 4/4] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-14  7:49 ` [dpdk-dev] [PATCH v2 0/4] mbuf: introduce pktmbuf pool with pinned external buffers Viacheslav Ovsiienko
2020-01-14  7:49   ` [dpdk-dev] [PATCH v2 1/4] mbuf: detach mbuf with pinned external buffer Viacheslav Ovsiienko
2020-01-14  7:49   ` [dpdk-dev] [PATCH v2 2/4] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-14  7:49   ` [dpdk-dev] [PATCH v2 3/4] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-14  7:49   ` [dpdk-dev] [PATCH v2 4/4] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-14  9:15 ` [dpdk-dev] [PATCH v3 0/4] mbuf: detach mbuf with pinned " Viacheslav Ovsiienko
2020-01-14  9:15   ` [dpdk-dev] [PATCH v3 1/4] " Viacheslav Ovsiienko
2020-01-14 15:27     ` Olivier Matz
2020-01-15 12:52       ` Slava Ovsiienko
2020-01-14 15:50     ` Stephen Hemminger
2020-01-14  9:15   ` [dpdk-dev] [PATCH v3 2/4] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-14 16:04     ` Olivier Matz
2020-01-15 18:13       ` Slava Ovsiienko
2020-01-14  9:15   ` [dpdk-dev] [PATCH v3 3/4] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-14  9:15   ` [dpdk-dev] [PATCH v3 4/4] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-16 13:04 ` [dpdk-dev] [PATCH v4 0/5] mbuf: detach mbuf with pinned " Viacheslav Ovsiienko
2020-01-16 13:04   ` [dpdk-dev] [PATCH v4 1/5] mbuf: introduce routine to get private mbuf pool flags Viacheslav Ovsiienko
2020-01-20 12:16     ` Olivier Matz
2020-01-16 13:04   ` [dpdk-dev] [PATCH v4 2/5] mbuf: detach mbuf with pinned external buffer Viacheslav Ovsiienko
2020-01-20 13:56     ` Olivier Matz
2020-01-20 15:41       ` Slava Ovsiienko
2020-01-20 16:17         ` Olivier Matz
2020-01-16 13:04   ` [dpdk-dev] [PATCH v4 3/5] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-20 13:59     ` Olivier Matz
2020-01-20 17:33       ` Slava Ovsiienko
2020-01-16 13:04   ` [dpdk-dev] [PATCH v4 4/5] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-20 14:11     ` Olivier Matz
2020-01-16 13:04   ` [dpdk-dev] [PATCH v4 5/5] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-20 17:23 ` [dpdk-dev] [PATCH v5 0/5] mbuf: detach mbuf with pinned " Viacheslav Ovsiienko
2020-01-20 17:23   ` [dpdk-dev] [PATCH v5 1/5] mbuf: introduce routine to get private mbuf pool flags Viacheslav Ovsiienko
2020-01-20 20:43     ` Stephen Hemminger
2020-01-20 22:52       ` Thomas Monjalon
2020-01-21  6:48       ` Slava Ovsiienko
2020-01-21  8:00       ` Slava Ovsiienko
2020-01-21  8:14         ` Olivier Matz
2020-01-21  8:23           ` Slava Ovsiienko
2020-01-21  9:13             ` Slava Ovsiienko
2020-01-21 14:01               ` Olivier Matz [this message]
2020-01-21 16:21                 ` Stephen Hemminger
2020-01-20 17:23   ` [dpdk-dev] [PATCH v5 2/5] mbuf: detach mbuf with pinned external buffer Viacheslav Ovsiienko
2020-01-20 17:40     ` Olivier Matz
2020-01-20 17:23   ` [dpdk-dev] [PATCH v5 3/5] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-20 17:46     ` Olivier Matz
2020-01-20 17:23   ` [dpdk-dev] [PATCH v5 4/5] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-20 17:23   ` [dpdk-dev] [PATCH v5 5/5] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-20 17:30   ` [dpdk-dev] [PATCH v5 0/5] mbuf: detach mbuf with pinned " Slava Ovsiienko
2020-01-20 17:41     ` Olivier Matz
2020-01-20 19:16 ` [dpdk-dev] [PATCH v6 " Viacheslav Ovsiienko
2020-01-20 19:16   ` [dpdk-dev] [PATCH v6 1/5] mbuf: introduce routine to get private mbuf pool flags Viacheslav Ovsiienko
2020-01-20 19:16   ` [dpdk-dev] [PATCH v6 2/5] mbuf: detach mbuf with pinned external buffer Viacheslav Ovsiienko
2023-12-06 10:55     ` [dpdk-dev] [PATCH v6 2/5] mbuf: detach mbuf with pinned externalbuffer Morten Brørup
2020-01-20 19:16   ` [dpdk-dev] [PATCH v6 3/5] mbuf: create packet pool with external memory buffers Viacheslav Ovsiienko
2020-01-20 20:48     ` Stephen Hemminger
2020-01-21  7:04       ` Slava Ovsiienko
2020-01-20 19:16   ` [dpdk-dev] [PATCH v6 4/5] app/testpmd: add mempool with external data buffers Viacheslav Ovsiienko
2020-01-20 19:16   ` [dpdk-dev] [PATCH v6 5/5] net/mlx5: allow use allocated mbuf with external buffer Viacheslav Ovsiienko
2020-01-20 22:55   ` [dpdk-dev] [PATCH v6 0/5] mbuf: detach mbuf with pinned " Thomas Monjalon
2020-01-22  8:50 ` [dpdk-dev] [PATCH] mbuf: fix pinned memory free routine style issue Viacheslav Ovsiienko
2020-02-06  9:46   ` Olivier Matz
2020-02-06 14:26     ` Thomas Monjalon
2020-01-24 20:25 ` [dpdk-dev] [PATCH] app/test: add test for mbuf with pinned external buffer Viacheslav Ovsiienko
2020-01-26 10:53   ` Slava Ovsiienko
2020-02-06  8:17   ` Olivier Matz
2020-02-06  8:24     ` Slava Ovsiienko
2020-02-06  9:51       ` Slava Ovsiienko
2020-02-06  9:49   ` [dpdk-dev] [PATCH v2] " Viacheslav Ovsiienko
2020-02-06 14:43     ` Thomas Monjalon

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