From: Yongseok Koh <yskoh@mellanox.com>
To: "Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>
Cc: adrien.mazarguil@6wind.com, dev@dpdk.org, stable@dpdk.org,
Shahaf Shuler <shahafs@mellanox.com>
Subject: Re: [dpdk-stable] [PATCH] net/mlx5: fix calculating TSO inline size
Date: Mon, 11 Sep 2017 15:17:44 -0700 [thread overview]
Message-ID: <20170911221743.GB1922@yongseok-MBP.local> (raw)
In-Reply-To: <20170904140107.nkr565m266sw5cyf@localhost>
On Mon, Sep 04, 2017 at 04:01:08PM +0200, Nélio Laranjeiro wrote:
> Hi Yongseok,
>
> Please see some comments below,
>
> On Thu, Aug 31, 2017 at 09:27:06AM -0700, Yongseok Koh wrote:
> > Tx descriptor for TSO embeds packet header to be replicated. If Tx inline
> > is enabled, there could be additional packet data inlined with 4B inline
> > header ahead. And between the header and additional inlined packet data,
> > there may be padding to make the inline part aligned to
> > MLX5_WQE_DWORD_SIZE. In calculating the total size of inlined data, the
> > size of inline header and padding is missing.
> >
> > Fixes: 3f13f8c23a7c ("net/mlx5: support hardware TSO")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
> > Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
> > ---
> > drivers/net/mlx5/mlx5_rxtx.c | 25 +++++++++----------------
> > 1 file changed, 9 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
> > index fe9e7eac0..f89fa40b5 100644
> > --- a/drivers/net/mlx5/mlx5_rxtx.c
> > +++ b/drivers/net/mlx5/mlx5_rxtx.c
> > @@ -524,19 +521,20 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
> > }
> > /* Inline if enough room. */
> > if (inline_en || tso) {
> > + uint32_t inl;
> > uintptr_t end = (uintptr_t)
> > (((uintptr_t)txq->wqes) +
> > (1 << txq->wqe_n) * MLX5_WQE_SIZE);
> > unsigned int inline_room = max_inline *
> > RTE_CACHE_LINE_SIZE -
> > - (pkt_inline_sz - 2);
> > + (pkt_inline_sz - 2) -
> > + !!tso * sizeof(inl);
>
> Is not it dangerous to assume inl will always be 4 bytes long? Why not
> writing the real value instead?
That was for readability of the code and uint32_t will be always 4bytes. But for
better readability, it should be 'inline_header' instead of 'inl' though. I'm
also okay with using "4" as well. Which way do you prefer?
Thanks,
Yongseok
next prev parent reply other threads:[~2017-09-11 22:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-31 16:27 Yongseok Koh
2017-09-04 14:01 ` Nélio Laranjeiro
2017-09-11 22:17 ` Yongseok Koh [this message]
2017-09-12 7:24 ` Nélio Laranjeiro
2017-09-12 18:34 ` Yongseok Koh
2017-09-13 5:05 ` Shahaf Shuler
2017-09-13 7:26 ` Nélio Laranjeiro
2017-09-15 8:39 ` Ferruh Yigit
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170911221743.GB1922@yongseok-MBP.local \
--to=yskoh@mellanox.com \
--cc=adrien.mazarguil@6wind.com \
--cc=dev@dpdk.org \
--cc=nelio.laranjeiro@6wind.com \
--cc=shahafs@mellanox.com \
--cc=stable@dpdk.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).