From: Alexander Aring <aahringo@redhat.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Alexander Aring <alex.aring@gmail.com>,
Stefan Schmidt <stefan@datenfreihafen.org>,
linux-wpan - ML <linux-wpan@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
"open list:NETWORKING [GENERAL]" <netdev@vger.kernel.org>,
David Girault <david.girault@qorvo.com>,
Romuald Despres <romuald.despres@qorvo.com>,
Frederic Blain <frederic.blain@qorvo.com>,
Nicolas Schodet <nico@ni.fr.eu.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH wpan-next v2 05/11] net: mac802154: Bring the hability to hold the transmit queue
Date: Tue, 17 May 2022 09:19:29 -0400 [thread overview]
Message-ID: <CAK-6q+ihfOSBjpw1Q-2qesd4nkrAfw_rBCd0QcWzXk0PP9Prtg@mail.gmail.com> (raw)
In-Reply-To: <20220517112726.4b89e907@xps-13>
Hi,
On Tue, May 17, 2022 at 5:28 AM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
>
> Hi Alex,
>
> > > @@ -84,7 +118,7 @@ void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
> > > hw->phy->sifs_period * NSEC_PER_USEC,
> > > HRTIMER_MODE_REL);
> > > } else {
> > > - ieee802154_wake_queue(hw);
> > > + ieee802154_release_queue(local);
> > > }
> > >
> > > dev_consume_skb_any(skb);
> > > @@ -98,7 +132,7 @@ void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
> > > struct ieee802154_local *local = hw_to_local(hw);
> > >
> > > local->tx_result = reason;
> > > - ieee802154_wake_queue(hw);
> > > + ieee802154_release_queue(local);
> > > dev_kfree_skb_any(skb);
> > > atomic_dec(&hw->phy->ongoing_txs);
> >
> > I am pretty sure that will end in a scheduling while atomic warning
> > with hwsim. If you don't hit it you have the wrong config, you need to
> > enable such warnings and have the right preemption model setting.
>
> I was using the "desktop" kernel preemption model (voluntary), I've
> switched to CONFIG_PREEMPT ("Preemptible kernel (Low-latency)"),
> and enabled CONFIG_DEBUG_ATOMIC_SLEEP. You are right that we should use
> a spinlock instead of a mutex here. However I don't think disabling
> IRQs is necessary, so I'll switch to spin_(un)lock() calls.
>
In my opinion it's necessary for the ifs hrtimer. Normal
spin_lock/unlock is not the right fit here.
- Alex
next prev parent reply other threads:[~2022-05-17 13:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 14:33 [PATCH wpan-next v2 00/11] ieee802154: Synchronous Tx support Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 01/11] net: mac802154: Rename the synchronous xmit worker Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 02/11] net: mac802154: Rename the main tx_work struct Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 03/11] net: mac802154: Enhance the error path in the main tx helper Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 04/11] net: mac802154: Follow the count of ongoing transmissions Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 05/11] net: mac802154: Bring the hability to hold the transmit queue Miquel Raynal
2022-05-15 22:19 ` Alexander Aring
2022-05-17 9:27 ` Miquel Raynal
2022-05-17 13:19 ` Alexander Aring [this message]
2022-05-17 13:28 ` Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 06/11] net: mac802154: Create a hot tx path Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 07/11] net: mac802154: Introduce a helper to disable the queue Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 08/11] net: mac802154: Introduce a tx queue flushing mechanism Miquel Raynal
2022-05-15 22:23 ` Alexander Aring
2022-05-17 13:20 ` Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 09/11] net: mac802154: Introduce a synchronous API for MLME commands Miquel Raynal
2022-05-15 22:28 ` Alexander Aring
2022-05-15 22:56 ` Alexander Aring
2022-05-15 23:03 ` Alexander Aring
2022-05-17 13:30 ` Miquel Raynal
2022-05-18 1:14 ` Alexander Aring
2022-05-18 10:12 ` Miquel Raynal
2022-05-18 12:05 ` Alexander Aring
2022-05-18 12:37 ` Miquel Raynal
2022-05-18 13:08 ` Alexander Aring
2022-05-18 16:12 ` Miquel Raynal
2022-05-19 1:51 ` Alexander Aring
2022-05-19 14:20 ` Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 10/11] net: mac802154: Add a warning in the hot path Miquel Raynal
2022-05-15 22:30 ` Alexander Aring
2022-05-17 13:36 ` Miquel Raynal
2022-05-17 14:52 ` Miquel Raynal
2022-05-18 0:59 ` Alexander Aring
2022-05-18 9:13 ` Miquel Raynal
2022-05-12 14:33 ` [PATCH wpan-next v2 11/11] net: mac802154: Add a warning in the slow path Miquel Raynal
2022-05-15 22:30 ` Alexander Aring
2022-05-17 13:45 ` Miquel Raynal
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=CAK-6q+ihfOSBjpw1Q-2qesd4nkrAfw_rBCd0QcWzXk0PP9Prtg@mail.gmail.com \
--to=aahringo@redhat.com \
--cc=alex.aring@gmail.com \
--cc=davem@davemloft.net \
--cc=david.girault@qorvo.com \
--cc=frederic.blain@qorvo.com \
--cc=kuba@kernel.org \
--cc=linux-wpan@vger.kernel.org \
--cc=miquel.raynal@bootlin.com \
--cc=netdev@vger.kernel.org \
--cc=nico@ni.fr.eu.org \
--cc=pabeni@redhat.com \
--cc=romuald.despres@qorvo.com \
--cc=stefan@datenfreihafen.org \
--cc=thomas.petazzoni@bootlin.com \
/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).