patches for DPDK stable branches
 help / color / mirror / Atom feed
From: "Yu, DapengX" <dapengx.yu@intel.com>
To: "Yigit, Ferruh" <ferruh.yigit@intel.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Xing, Beilei" <beilei.xing@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [PATCH] net/iavf: fix multi-process shared data
Date: Thu, 30 Sep 2021 09:11:15 +0000
Message-ID: <PH0PR11MB51250D85CD5BCBE6116FECA28CAA9@PH0PR11MB5125.namprd11.prod.outlook.com> (raw)
In-Reply-To: <ffe33a81-3a8c-c306-db34-909afcd8ea44@intel.com>



> -----Original Message-----
> From: Yigit, Ferruh <ferruh.yigit@intel.com>
> Sent: Thursday, September 30, 2021 12:28 AM
> To: Yu, DapengX <dapengx.yu@intel.com>; Richardson, Bruce
> <bruce.richardson@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>;
> Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-stable] [PATCH] net/iavf: fix multi-process shared data
> 
> On 9/28/2021 4:37 AM, dapengx.yu@intel.com wrote:
> > From: Dapeng Yu <dapengx.yu@intel.com>
> >
> > When the iavf_adapter instance is not initialized completedly in the
> > primary process, the secondary process accesses its "rte_eth_dev"
> > member, it causes secondary process crash.
> >
> > This patch replaces adapter->eth_dev with rte_eth_devices[port_id] in
> > the data paths where rte_eth_dev instance is accessed.
> >
> > Fixes: f978c1c9b3b5 ("net/iavf: add RSS hash parsing in AVX path")
> > Fixes: 9c9aa0040344 ("net/iavf: add offload path for Rx AVX512 flex
> > descriptor")
> > Fixes: 63660ea3ee0b ("net/iavf: add RSS hash parsing in SSE path")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> > ---
> >  drivers/net/iavf/iavf_rxtx_vec_avx2.c   | 5 +++--
> >  drivers/net/iavf/iavf_rxtx_vec_avx512.c | 5 +++--
> >  drivers/net/iavf/iavf_rxtx_vec_sse.c    | 3 ++-
> >  3 files changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx2.c
> > b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
> > index 475070e036..59b086ade5 100644
> > --- a/drivers/net/iavf/iavf_rxtx_vec_avx2.c
> > +++ b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
> > @@ -525,6 +525,7 @@ _iavf_recv_raw_pkts_vec_avx2_flex_rxd(struct
> > iavf_rx_queue *rxq,  #define IAVF_DESCS_PER_LOOP_AVX 8
> >
> >  	const uint32_t *type_table = rxq->vsi->adapter->ptype_tbl;
> > +	struct rte_eth_dev *dev = &rte_eth_devices[rxq->port_id];
> >
> 
> It is not good idea to access global variable directly from the driver.
In "lib/ethdev/rte_ethdev.h", the global variable rte_eth_devices is used.
So I think use it in a PMD should be also acceptable since it is just read.
rte_eth_rx_burst(uint16_t port_id, uint16_t queue_id,
		 struct rte_mbuf **rx_pkts, const uint16_t nb_pkts)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];

> 
> The problem definition is correct, eth_dev is unique per process, so it can't
> be saved to a shared struct.
> 
> But here I assume real intention is to be able to access PMD specific data
> from queue struct, for this what about storing 'rte_eth_dev_data' in the
> 'iavf_rx_queue', this should sove the problem without accessing the global
> variable.

The intention is to read the offload properties of device configuration, so it not 
queue specific or PMD specific. It is already in public data structure.
If it is stored in 'iavf_rx_queue' again, the data will be duplicate.


  reply	other threads:[~2021-09-30  9:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-28  3:37 dapengx.yu
2021-09-28 11:12 ` [dpdk-stable] [dpdk-dev] " Zhang, Qi Z
2021-09-29 16:28 ` [dpdk-stable] " Ferruh Yigit
2021-09-30  9:11   ` Yu, DapengX [this message]
2021-09-30 10:57     ` Ferruh Yigit
2021-10-07  4:50       ` [dpdk-stable] [dpdk-dev] " Zhang, Qi Z
2021-10-09  3:25 ` [dpdk-stable] [PATCH v2] " dapengx.yu
2021-10-09  9:40   ` Zhang, Qi Z
2021-10-11  2:01   ` [dpdk-stable] [PATCH v3] " dapengx.yu
2021-10-11  2:57     ` Zhang, Qi Z

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=PH0PR11MB51250D85CD5BCBE6116FECA28CAA9@PH0PR11MB5125.namprd11.prod.outlook.com \
    --to=dapengx.yu@intel.com \
    --cc=beilei.xing@intel.com \
    --cc=bruce.richardson@intel.com \
    --cc=dev@dpdk.org \
    --cc=ferruh.yigit@intel.com \
    --cc=jingjing.wu@intel.com \
    --cc=konstantin.ananyev@intel.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

patches for DPDK stable branches

This inbox may be cloned and mirrored by anyone:

	git clone --mirror http://inbox.dpdk.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ http://inbox.dpdk.org/stable \
		stable@dpdk.org
	public-inbox-index stable

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.stable


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git