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From: Aaron Conole <aconole@redhat.com>
To: Alejandro Lucero <alejandro.lucero@netronome.com>
Cc: dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [RFC 1/2] nfp: unlink the appropriate lock file
Date: Fri, 13 Apr 2018 09:24:57 -0400	[thread overview]
Message-ID: <f7tefjjz1au.fsf@dhcp-25.97.bos.redhat.com> (raw)
In-Reply-To: <CAD+H993G4oUxPEgvVUY6de0b0PD0yN09zbpy8zvwPi9gE9Q+Zw@mail.gmail.com> (Alejandro Lucero's message of "Fri, 13 Apr 2018 09:31:41 +0200")

Alejandro Lucero <alejandro.lucero@netronome.com> writes:

> Although the patch is correct, the truth is there was not option for locks but "nfp0", because
> the PMD did not support more than one NFP card. 
>
> After commit with CPP support, the PMD can support more than one NFP card, but this
> interface is not supported anymore and this file was removed.
>
> is this patch coming from some code revision or from a problem you found?

Just a code review - we were reported a problem initializing the driver,
and in looking at the lock/unlock code, it seems that it was always
releasing the nfp0 lock.  Good to know that in practice it likely
wouldn't cause real harm.  I intend to resubmit this as is.

Thanks, Alejandro!

> On Fri, Apr 13, 2018 at 12:22 AM, Aaron Conole <aconole@redhat.com> wrote:
>
>  The nfpu_close needs to unlink the lock file associated with the
>  nfp descriptor, not lock file 0.
>
>  Fixes: d12206e00590 ("net/nfp: add NSP user space interface")
>
>  Cc: stable@dpdk.org
>  Signed-off-by: Aaron Conole <aconole@redhat.com>
>  ---
>   drivers/net/nfp/nfp_nfpu.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
>  diff --git a/drivers/net/nfp/nfp_nfpu.c b/drivers/net/nfp/nfp_nfpu.c
>  index f11afef35..2ed985ff4 100644
>  --- a/drivers/net/nfp/nfp_nfpu.c
>  +++ b/drivers/net/nfp/nfp_nfpu.c
>  @@ -101,8 +101,12 @@ nfpu_open(struct rte_pci_device *pci_dev, nfpu_desc_t *desc,
>  int nfp)
>   int
>   nfpu_close(nfpu_desc_t *desc)
>   {
>  +       char lockname[30];
>  +
>          rte_free(desc->nspu);
>          close(desc->lock);
>  -       unlink("/var/lock/nfp0");
>  +
>  +       snprintf(lockname, sizeof(lockname), "/var/lock/nfp%d", desc->nfp);
>  +       unlink(lockname);
>          return 0;
>   }
>  -- 
>  2.14.3

  reply	other threads:[~2018-04-13 13:24 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-12 22:22 [dpdk-dev] [RFC 0/2] nfp driver fixes Aaron Conole
2018-04-12 22:22 ` [dpdk-dev] [RFC 1/2] nfp: unlink the appropriate lock file Aaron Conole
2018-04-13  7:31   ` Alejandro Lucero
2018-04-13 13:24     ` Aaron Conole [this message]
2018-04-12 22:22 ` [dpdk-dev] [RFC 2/2] nfp: allow for non-root user Aaron Conole
2018-04-13  7:37   ` Alejandro Lucero
2018-04-13 13:31     ` Aaron Conole
2018-04-13 15:31       ` Alejandro Lucero
2018-04-17 15:44         ` Alejandro Lucero
2018-04-17 15:54           ` Alejandro Lucero
2018-04-17 19:19             ` Aaron Conole
2018-04-18 10:53               ` Alejandro Lucero
2018-04-18 12:32                 ` Aaron Conole
2018-04-19  6:05                   ` Alejandro Lucero
2018-04-20 14:12                     ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-04-20 14:56                       ` Aaron Conole
2018-04-17 15:54           ` [dpdk-dev] " Thomas Monjalon
2018-04-17 16:24             ` Alejandro Lucero
2018-04-17 19:06               ` Thomas Monjalon
2018-04-13  7:26 ` [dpdk-dev] [RFC 0/2] nfp driver fixes Alejandro Lucero
2018-04-13 13:23   ` Aaron Conole
2018-04-13 15:36     ` Alejandro Lucero

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