From: Elad Nachman <eladv6@gmail.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Eric Christian <erclists@gmail.com>, dev <dev@dpdk.org>,
Igor Ryzhov <iryzhov@nfware.com>
Subject: Re: [dpdk-dev] [PATCH v2] kni: Fix request overwritten
Date: Mon, 4 Oct 2021 16:09:49 +0300 [thread overview]
Message-ID: <CACXF7qkpzZiSbtDf8YFU_vVNLc6ytmjXh4yUe+xHhYUnOdzyRQ@mail.gmail.com> (raw)
In-Reply-To: <f52600ed-3d80-457d-b096-8814850990f3@intel.com>
Hi,
EAGAIN is propogated back to the kernel and to the caller.
We cannot retry from the kni kernel module since we hold the rtnl lock.
FYI,
Elad
בתאריך יום ב׳, 4 באוק׳ 2021, 16:05, מאת Ferruh Yigit <
ferruh.yigit@intel.com>:
> On 9/24/2021 11:54 AM, Elad Nachman wrote:
> > Fix lack of multiple KNI requests handling support by introducing a
> > request in progress flag which will fail additional requests with
> > EAGAIN return code if the original request has not been processed
> > by user-space.
> >
> > Bugzilla ID: 809
>
> Hi Eric,
>
> Can you please test this patch, if it solves the issue you reported?
>
> >
> > Signed-off-by: Elad Nachman <eladv6@gmail.com>
> > ---
> > kernel/linux/kni/kni_net.c | 9 +++++++++
> > lib/kni/rte_kni.c | 2 ++
> > lib/kni/rte_kni_common.h | 1 +
> > 3 files changed, 12 insertions(+)
> >
>
> <...>
>
> > @@ -123,7 +124,15 @@ kni_net_process_request(struct net_device *dev,
> struct rte_kni_request *req)
> >
> > mutex_lock(&kni->sync_lock);
> >
> > + /* Check that existing request has been processed: */
> > + cur_req = (struct rte_kni_request *)kni->sync_kva;
> > + if (cur_req->req_in_progress) {
> > + ret = -EAGAIN;
>
> Overall logic in the KNI looks good to me, this helps to serialize the
> requests
> even for async ones.
>
> But can you please clarify how it behaves in the kernel side with '-EAGAIN'
> return type? Will linux call the ndo again, or will it just fail.
>
> If it just fails should we handle the re-try on '-EAGAIN' within the kni
> module?
>
>
next prev parent reply other threads:[~2021-10-04 13:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 10:54 Elad Nachman
2021-10-04 13:01 ` Ferruh Yigit
2021-10-04 13:09 ` Elad Nachman [this message]
2021-10-04 14:03 ` Ferruh Yigit
2021-10-04 14:25 ` Elad Nachman
2021-10-04 14:51 ` Ferruh Yigit
2021-10-04 14:58 ` Elad Nachman
2021-10-04 15:48 ` Ferruh Yigit
2021-10-04 16:18 ` Elad Nachman
2021-10-04 16:59 ` Eric Christian
2021-10-04 18:27 ` Elad Nachman
2021-10-08 20:23 ` Ferruh Yigit
2021-10-08 21:11 ` Ferruh Yigit
2021-10-04 14:14 ` Eric Christian
2021-10-04 14:56 ` Ferruh Yigit
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