From: Yongseok Koh <yskoh@mellanox.com>
To: Andrew Rybchenko <arybchenko@solarflare.com>
Cc: wenzhuo.lu@intel.com, jingjing.wu@intel.com,
olivier.matz@6wind.com, dev@dpdk.org,
konstantin.ananyev@intel.com, adrien.mazarguil@6wind.com,
nelio.laranjeiro@6wind.com
Subject: Re: [dpdk-dev] [PATCH v4 1/2] mbuf: support attaching external buffer to mbuf
Date: Tue, 24 Apr 2018 15:30:49 -0700 [thread overview]
Message-ID: <20180424223048.GB88208@yongseok-MBP.local> (raw)
In-Reply-To: <934e714e-3cba-7f5d-9fcf-4f96611d758f@solarflare.com>
On Tue, Apr 24, 2018 at 03:28:33PM +0300, Andrew Rybchenko wrote:
> On 04/24/2018 04:38 AM, Yongseok Koh wrote:
[...]
> > diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
> > index 06eceba37..7f6507a66 100644
> > --- a/lib/librte_mbuf/rte_mbuf.h
> > +++ b/lib/librte_mbuf/rte_mbuf.h
> > @@ -326,7 +326,7 @@ extern "C" {
> > PKT_TX_MACSEC | \
> > PKT_TX_SEC_OFFLOAD)
> > -#define __RESERVED (1ULL << 61) /**< reserved for future mbuf use */
> > +#define EXT_ATTACHED_MBUF (1ULL << 61) /**< Mbuf having external buffer */
>
> May be it should mention that shinfo is filled in.
Okay.
> > #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
> > @@ -566,8 +566,24 @@ struct rte_mbuf {
> > /** Sequence number. See also rte_reorder_insert(). */
> > uint32_t seqn;
> > + struct rte_mbuf_ext_shared_info *shinfo;
>
> I think it would be useful to add comment that it is used in the case of
> RTE_MBUF_HAS_EXTBUF() only.
Oops, I missed that. Thanks.
[...]
> > +static inline char * __rte_experimental
> > +rte_pktmbuf_attach_extbuf(struct rte_mbuf *m, void *buf_addr,
> > + rte_iova_t buf_iova, uint16_t buf_len,
> > + struct rte_mbuf_ext_shared_info *shinfo,
> > + rte_mbuf_extbuf_free_callback_t free_cb, void *fcb_opaque)
> > +{
> > + void *buf_end = RTE_PTR_ADD(buf_addr, buf_len);
>
> May I suggest to move it inside if (shinfo == NULL) to make it clear that it
> is not used if shinfo pointer is provided.
Done.
[...]
> > static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
> > {
> > - struct rte_mbuf *md;
> > -
> > RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
> > rte_mbuf_refcnt_read(mi) == 1);
> > - /* if m is not direct, get the mbuf that embeds the data */
> > - if (RTE_MBUF_DIRECT(m))
> > - md = m;
> > - else
> > - md = rte_mbuf_from_indirect(m);
> > + if (RTE_MBUF_HAS_EXTBUF(m)) {
> > + rte_mbuf_ext_refcnt_update(m->shinfo, 1);
> > + mi->ol_flags = m->ol_flags;
> > + } else {
> > + rte_mbuf_refcnt_update(rte_mbuf_from_indirect(m), 1);
>
> It looks like handling of the direct mbuf is lost here. May be it is
> intentional
> to avoid branching since result will be the same for direct mbuf as well,
> but looks confusing. Deserves at least a comment which explains why.
> Ideally it should be proven by measurements.
Right, that was intentional to avoid the branch. Sometimes branch is more
expensive than arithmetic ops in core's pipeline. Will add a comment.
[...]
> > +static inline void
> > +__rte_pktmbuf_free_direct(struct rte_mbuf *m)
> > +{
> > + struct rte_mbuf *md = rte_mbuf_from_indirect(m);
>
> Shouldn't it be done after below assertion? Just to be less confusing.
Right. Done.
> > +
> > + RTE_ASSERT(RTE_MBUF_INDIRECT(m));
> > +
> > + if (rte_mbuf_refcnt_update(md, -1) == 0) {
>
> It is not directly related to the changeset, but rte_pktmbuf_prefree_seg()
> has many optimizations which could be useful here:
> - do not update if refcnt is 1
> - do not set next/nb_seq if next is already NULL
Would be better to have a separate patch later.
Thanks,
Yongseok
> > + md->next = NULL;
> > + md->nb_segs = 1;
> > + rte_mbuf_refcnt_set(md, 1);
> > + rte_mbuf_raw_free(md);
> > + }
> > +}
>
> [...]
next prev parent reply other threads:[~2018-04-24 22:31 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-10 1:25 [dpdk-dev] [PATCH v1 0/6] net/mlx5: add Multi-Packet Rx support Yongseok Koh
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 1/6] mbuf: add buffer offset field for flexible indirection Yongseok Koh
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 2/6] net/mlx5: separate filling Rx flags Yongseok Koh
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 3/6] net/mlx5: add a function to rdma-core glue Yongseok Koh
2018-03-12 9:13 ` Nélio Laranjeiro
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 4/6] net/mlx5: add Multi-Packet Rx support Yongseok Koh
2018-03-12 9:20 ` Nélio Laranjeiro
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 5/6] net/mlx5: release Tx queue resource earlier than Rx Yongseok Koh
2018-03-10 1:25 ` [dpdk-dev] [PATCH v1 6/6] app/testpmd: conserve mbuf indirection flag Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 0/6] net/mlx5: add Multi-Packet Rx support Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 1/6] mbuf: add buffer offset field for flexible indirection Yongseok Koh
2018-04-03 8:26 ` Olivier Matz
2018-04-04 0:12 ` Yongseok Koh
2018-04-09 16:04 ` Olivier Matz
2018-04-10 1:59 ` Yongseok Koh
2018-04-11 0:25 ` Ananyev, Konstantin
2018-04-11 5:33 ` Yongseok Koh
2018-04-11 11:39 ` Ananyev, Konstantin
2018-04-11 14:02 ` Andrew Rybchenko
2018-04-11 17:18 ` Yongseok Koh
2018-04-11 17:08 ` Yongseok Koh
2018-04-12 16:34 ` Ananyev, Konstantin
2018-04-12 18:58 ` Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 2/6] net/mlx5: separate filling Rx flags Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 3/6] net/mlx5: add a function to rdma-core glue Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 4/6] net/mlx5: add Multi-Packet Rx support Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 5/6] net/mlx5: release Tx queue resource earlier than Rx Yongseok Koh
2018-04-02 18:50 ` [dpdk-dev] [PATCH v2 6/6] app/testpmd: conserve mbuf indirection flag Yongseok Koh
2018-04-19 1:11 ` [dpdk-dev] [PATCH v3 1/2] mbuf: support attaching external buffer to mbuf Yongseok Koh
2018-04-19 1:11 ` [dpdk-dev] [PATCH v3 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-23 11:53 ` [dpdk-dev] [PATCH v3 1/2] mbuf: support attaching external buffer to mbuf Ananyev, Konstantin
2018-04-24 2:04 ` Yongseok Koh
2018-04-25 13:16 ` Ananyev, Konstantin
2018-04-25 16:44 ` Yongseok Koh
2018-04-25 18:05 ` Ananyev, Konstantin
2018-04-23 16:18 ` Olivier Matz
2018-04-24 1:29 ` Yongseok Koh
2018-04-24 15:36 ` Olivier Matz
2018-04-24 1:38 ` [dpdk-dev] [PATCH v4 " Yongseok Koh
2018-04-24 1:38 ` [dpdk-dev] [PATCH v4 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-24 5:01 ` [dpdk-dev] [PATCH v4 1/2] mbuf: support attaching external buffer to mbuf Stephen Hemminger
2018-04-24 11:47 ` Yongseok Koh
2018-04-24 12:28 ` Andrew Rybchenko
2018-04-24 16:02 ` Olivier Matz
2018-04-24 18:21 ` [dpdk-dev] ***Spam*** " Andrew Rybchenko
2018-04-24 19:15 ` [dpdk-dev] " Olivier Matz
2018-04-24 20:22 ` Thomas Monjalon
2018-04-24 21:53 ` Yongseok Koh
2018-04-24 22:15 ` Thomas Monjalon
2018-04-25 8:21 ` Olivier Matz
2018-04-25 15:06 ` Stephen Hemminger
2018-04-24 23:34 ` Yongseok Koh
2018-04-25 14:45 ` Andrew Rybchenko
2018-04-25 17:40 ` Yongseok Koh
2018-04-25 8:28 ` Olivier Matz
2018-04-25 9:08 ` Yongseok Koh
2018-04-25 9:19 ` Yongseok Koh
2018-04-25 20:00 ` Olivier Matz
2018-04-25 22:54 ` Yongseok Koh
2018-04-24 22:30 ` Yongseok Koh [this message]
2018-04-25 2:53 ` [dpdk-dev] [PATCH v5 " Yongseok Koh
2018-04-25 2:53 ` [dpdk-dev] [PATCH v5 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-25 13:31 ` [dpdk-dev] [PATCH v5 1/2] mbuf: support attaching external buffer to mbuf Ananyev, Konstantin
2018-04-25 17:06 ` Yongseok Koh
2018-04-25 17:23 ` Ananyev, Konstantin
2018-04-25 18:02 ` Yongseok Koh
2018-04-25 18:22 ` Yongseok Koh
2018-04-25 18:30 ` Yongseok Koh
2018-04-26 1:10 ` [dpdk-dev] [PATCH v6 " Yongseok Koh
2018-04-26 1:10 ` [dpdk-dev] [PATCH v6 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-26 11:39 ` [dpdk-dev] [PATCH v6 1/2] mbuf: support attaching external buffer to mbuf Ananyev, Konstantin
2018-04-26 16:05 ` Andrew Rybchenko
2018-04-26 16:10 ` Thomas Monjalon
2018-04-26 19:42 ` Olivier Matz
2018-04-26 19:58 ` Thomas Monjalon
2018-04-26 20:07 ` Olivier Matz
2018-04-26 20:24 ` Thomas Monjalon
2018-04-26 17:18 ` Yongseok Koh
2018-04-26 19:45 ` Olivier Matz
2018-04-27 0:01 ` [dpdk-dev] [PATCH v7 " Yongseok Koh
2018-04-27 0:01 ` [dpdk-dev] [PATCH v7 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-27 8:00 ` Andrew Rybchenko
2018-04-27 7:22 ` [dpdk-dev] [PATCH v7 1/2] mbuf: support attaching external buffer to mbuf Andrew Rybchenko
2018-04-27 17:22 ` [dpdk-dev] [PATCH v8 " Yongseok Koh
2018-04-27 17:22 ` [dpdk-dev] [PATCH v8 2/2] app/testpmd: conserve offload flags of mbuf Yongseok Koh
2018-04-27 18:09 ` [dpdk-dev] [PATCH v8 1/2] mbuf: support attaching external buffer to mbuf Thomas Monjalon
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