DPDK patches and discussions
 help / color / mirror / Atom feed
From: "Mody, Rasesh" <Rasesh.Mody@cavium.com>
To: Kevin Traynor <ktraynor@redhat.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "ferruh.yigit@intel.com" <ferruh.yigit@intel.com>,
	Dept-Eng DPDK Dev <Dept-EngDPDKDev@cavium.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] net/qede: fix L2-handles used for RSS hash update
Date: Tue, 5 Jun 2018 17:14:34 +0000	[thread overview]
Message-ID: <SN1PR07MB40324B27FAB1E4AA116EE5C09F660@SN1PR07MB4032.namprd07.prod.outlook.com> (raw)
In-Reply-To: <5abb59fb-5d42-2e91-3004-bf462695958c@redhat.com>

> From: Kevin Traynor [mailto:ktraynor@redhat.com]
> Sent: Tuesday, June 05, 2018 9:42 AM
> 
> On 06/05/2018 05:16 PM, Mody, Rasesh wrote:
> >> From: Kevin Traynor [mailto:ktraynor@redhat.com]
> >> Sent: Tuesday, June 05, 2018 6:40 AM
> >>
> >> On 06/01/2018 06:16 PM, Rasesh Mody wrote:
> >>> Fix fast path array index which is used for passing L2 handles to
> >>> RSS indirection table. Currently, it is using the local copy of
> >>> indirection table. When the RX queue configuration changes the local
> >>> copy becomes invalid.
> >>>
> >>> Fixes: 69d7ba88f1a1 ("net/qede/base: use L2-handles for RSS
> >>> configuration")
> >>> Cc: stable@dpdk.org
> >>>
> >>> Signed-off-by: Rasesh Mody <rasesh.mody@cavium.com>
> >>> ---
> >>>  drivers/net/qede/qede_ethdev.c |    2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/net/qede/qede_ethdev.c
> >>> b/drivers/net/qede/qede_ethdev.c index 3206cc6..6e9e76d 100644
> >>> --- a/drivers/net/qede/qede_ethdev.c
> >>> +++ b/drivers/net/qede/qede_ethdev.c
> >>> @@ -2210,7 +2210,7 @@ int qede_rss_hash_update(struct rte_eth_dev
> >> *eth_dev,
> >>>  	vport_update_params.vport_id = 0;
> >>>  	/* pass the L2 handles instead of qids */
> >>>  	for (i = 0 ; i < ECORE_RSS_IND_TABLE_SIZE ; i++) {
> >>> -		idx = qdev->rss_ind_table[i];
> >>> +		idx = ECORE_RSS_IND_TABLE_SIZE %
> >> QEDE_RSS_COUNT(qdev);
> >>>  		rss_params.rss_ind_table[i] = qdev->fp_array[idx].rxq-
> handle;
> >>
> >> hi, idx never changes in the loop, so the same rxq handle is in every
> >> rss_ind_table entry - is it right?
> >
> > The idx depends on number of RXQs. If a single RXQ is configured then idx
> does not change in the loop,  in which case same RXQ handle is in every
> entry.
> 
> The value depends on number of Rxqs, but that value will not change for
> each of 128 iterations *regardless* of the number of Rxq's configured
> (assuming that will be static during the loop). Perhaps that's what you want,
> but it looks odd to be calculating the idx in each loop iteration when it won't
> change.

I see what you are saying, will send a revised patch, thanks.

> 
> idx = ECORE_RSS_IND_TABLE_SIZE % QEDE_RSS_COUNT(qdev)
> 
> =>
> 
> idx = 128 % qdev->num_rx_queues
> 
> >
> > Thanks!
> > -Rasesh
> >>
> >>>  	}
> >>>  	vport_update_params.rss_params = &rss_params;
> >>>
> >


  reply	other threads:[~2018-06-05 17:14 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-01 17:16 Rasesh Mody
2018-06-05 13:39 ` Kevin Traynor
2018-06-05 16:16   ` Mody, Rasesh
2018-06-05 16:41     ` Kevin Traynor
2018-06-05 17:14       ` Mody, Rasesh [this message]
2018-06-05 23:03 ` [dpdk-dev] [PATCH v2] " Rasesh Mody
2018-06-06 11:11   ` Kevin Traynor
2018-06-06 18:40   ` 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=SN1PR07MB40324B27FAB1E4AA116EE5C09F660@SN1PR07MB4032.namprd07.prod.outlook.com \
    --to=rasesh.mody@cavium.com \
    --cc=Dept-EngDPDKDev@cavium.com \
    --cc=dev@dpdk.org \
    --cc=ferruh.yigit@intel.com \
    --cc=ktraynor@redhat.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).