From: "Ergin, Mesut A" <mesut.a.ergin@intel.com>
To: "Zhang, Qi Z" <qi.z.zhang@intel.com>,
"Xing, Beilei" <beilei.xing@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 3/3] net/i40e: fix inadvertent override of vector RX allowance
Date: Fri, 24 May 2019 18:08:45 +0000 [thread overview]
Message-ID: <3615B82CA151CF42A86EDDD9846A8B38C7A8E453@ORSMSX112.amr.corp.intel.com> (raw)
In-Reply-To: <039ED4275CED7440929022BC67E7061153386A98@SHSMSX103.ccr.corp.intel.com>
Hi,
> > > > i40e_rx_vec_dev_conf_condition_check_default(struct rte_eth_dev *dev)
> > > > if (rxmode->offloads & DEV_RX_OFFLOAD_VLAN_EXTEND)
> > > > return -1;
> > > >
> > > > + /* Should not override if vector was already disallowed */
> > >
> > > It is possible a device be reconfigured between dev_stop/dev_start,
> > > vector mode may fit for the new configure, so the old rx_vec_allowd
> > > should be ignored,
> > >
> >
> > i40e_dev_configure would reset rx_vec_allowed already. Am I missing another
> > reconfiguration path?
>
> Look at below scenario,
>
> 1. dev_configure (rx_vec_allowed is reset to true)
> 2. queue_setup (the ring size is not power of 2)
> 3. dev_start (vector will not be selected due to ring size, rx_vec_allowed set to
> false)
> 4. dev_stop
> 5. queue_setup (this time, with power of 2 ring size)
> 6. dev_start (assume vector path should be selected, and rx_vec_allowed should
> be overwrite to true, but your patch will prevent it)
>
> Also, I may not get the point of the gap you observed, would you share more
> detail scenario?
>
> Regards
> Qi
It seems like queue setup should reset vector_allowed flag, too. Because
i40e_dev_rx_queue_setup_runtime is already doing it, though covering
only half of the state space (i.e. device already started).
Do you think this patch plus that would be a preferred approach?
>
> >
> > Mesut
> >
> > > Regards
> > > Qi
> > >
> > > > + if (!ad->rx_vec_allowed)
> > > > + return -1;
> > > > +
> > > > /**
> > > > * Vector mode is allowed only when number of Rx queue
> > > > * descriptor is power of 2.
> > > > --
> > > > 2.7.4
next prev parent reply other threads:[~2019-05-24 18:08 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 4:28 [dpdk-dev] [PATCH 0/3] net/i40e: improve rte_flow offload with MARK + RSS Mesut Ali Ergin
2019-05-16 4:28 ` [dpdk-dev] [PATCH 1/3] net/i40e: add support for MARK + RSS action in rte_flow Mesut Ali Ergin
2019-05-22 12:30 ` Zhang, Qi Z
2019-05-16 4:28 ` [dpdk-dev] [PATCH 2/3] net/i40e: add runtime option to disable vector rx Mesut Ali Ergin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 21:26 ` Ergin, Mesut A
2019-05-20 8:29 ` Ananyev, Konstantin
2019-05-20 17:53 ` Ergin, Mesut A
2019-05-20 23:11 ` Ananyev, Konstantin
2019-05-21 16:33 ` Ergin, Mesut A
2019-05-21 17:20 ` Ananyev, Konstantin
2019-05-21 20:55 ` Ergin, Mesut A
2019-05-22 11:01 ` Ananyev, Konstantin
2019-05-22 14:05 ` Thomas Monjalon
2019-05-22 14:32 ` Zhang, Qi Z
2019-05-23 13:10 ` Jerin Jacob Kollanukkaran
2019-05-23 17:54 ` Ergin, Mesut A
2019-05-16 4:28 ` [dpdk-dev] [PATCH 3/3] net/i40e: fix inadvertent override of vector RX allowance Mesut Ali Ergin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 20:57 ` Ergin, Mesut A
2019-05-22 12:42 ` Zhang, Qi Z
2019-05-23 18:25 ` Ergin, Mesut A
2019-05-24 2:39 ` Zhang, Qi Z
2019-05-24 18:08 ` Ergin, Mesut A [this message]
2019-05-25 11:29 ` Zhang, Qi Z
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