From: Justin Lai <justinlai0215@realtek.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: "davem@davemloft.net" <davem@davemloft.net>,
"edumazet@google.com" <edumazet@google.com>,
"pabeni@redhat.com" <pabeni@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"andrew@lunn.ch" <andrew@lunn.ch>,
"jiri@resnulli.us" <jiri@resnulli.us>,
"horms@kernel.org" <horms@kernel.org>,
"rkannoth@marvell.com" <rkannoth@marvell.com>,
"Ping-Ke Shih" <pkshih@realtek.com>,
Larry Chiu <larry.chiu@realtek.com>
Subject: RE: [PATCH net-next v20 07/13] rtase: Implement a function to receive packets
Date: Tue, 18 Jun 2024 03:40:34 +0000 [thread overview]
Message-ID: <5835ed19887d4b5fae93c54c1704fa2b@realtek.com> (raw)
In-Reply-To: <20240617080232.620a2452@kernel.org>
> On Mon, 17 Jun 2024 06:44:55 +0000 Justin Lai wrote:
> > > > + /* make sure discriptor has been updated */
> > > > + rmb();
> > >
> > > Barriers are between things. What is this barrier between?
> >
> > At the end of this do while loop, it fetches the next descriptor. This
> > barrier is mainly used between fetching the next descriptor and using
> > the next descriptor, to ensure that the content of the next descriptor
> > is completely fetched before using it.
>
> What does it mean to "fetch the next descriptor"? The prefetch?
> Prefetches are not ordered at all.
Let me explain again, at the end of the do while loop in rx_handler, we
have changed the address pointed by desc to the next descriptor.
Therefore, the main purpose of this barrier is to ensure that both desc
and cur_rx have been updated to the next entry.
next prev parent reply other threads:[~2024-06-18 3:41 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-07 8:43 [PATCH net-next v20 00/13] Add Realtek automotive PCIe driver Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 01/13] rtase: Add pci table supported in this module Justin Lai
2024-06-13 9:01 ` Markus Elfring
2024-06-17 8:14 ` Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 02/13] rtase: Implement the .ndo_open function Justin Lai
2024-06-13 7:50 ` Markus Elfring
2024-06-17 9:25 ` Justin Lai
2024-06-17 10:07 ` [v20 " Markus Elfring
2024-06-17 13:28 ` Justin Lai
2024-06-17 18:59 ` Simon Horman
2024-06-17 20:22 ` Markus Elfring
2024-06-18 7:51 ` Justin Lai
[not found] ` <202406181007.45IA7eWxA3305754@rtits1.realtek.com.tw>
2024-06-18 11:01 ` Justin Lai
2024-06-18 11:30 ` Markus Elfring
2024-06-07 8:43 ` [PATCH net-next v20 03/13] rtase: Implement the rtase_down function Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 04/13] rtase: Implement the interrupt routine and rtase_poll Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 05/13] rtase: Implement hardware configuration function Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 06/13] rtase: Implement .ndo_start_xmit function Justin Lai
2024-06-07 9:03 ` Hariprasad Kelam
2024-06-12 4:35 ` Justin Lai
2024-06-12 10:36 ` Hariprasad Kelam
2024-06-13 3:38 ` Justin Lai
2024-06-13 7:24 ` Hariprasad Kelam
2024-06-07 15:54 ` Ratheesh Kannoth
2024-06-12 4:20 ` Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 07/13] rtase: Implement a function to receive packets Justin Lai
2024-06-13 0:43 ` Jakub Kicinski
2024-06-17 6:44 ` Justin Lai
2024-06-17 15:02 ` Jakub Kicinski
2024-06-18 3:40 ` Justin Lai [this message]
2024-06-07 8:43 ` [PATCH net-next v20 08/13] rtase: Implement net_device_ops Justin Lai
2024-06-13 0:39 ` Jakub Kicinski
2024-06-13 3:16 ` Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 09/13] rtase: Implement pci_driver suspend and resume function Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 10/13] rtase: Implement ethtool function Justin Lai
2024-06-13 0:35 ` Jakub Kicinski
2024-06-17 6:54 ` Justin Lai
2024-06-17 14:07 ` Andrew Lunn
2024-06-18 9:56 ` Justin Lai
2024-06-17 15:10 ` Jakub Kicinski
2024-06-18 7:28 ` Justin Lai
2024-06-18 14:24 ` Jakub Kicinski
2024-06-19 3:40 ` Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 11/13] rtase: Add a Makefile in the rtase folder Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 12/13] realtek: Update the Makefile and Kconfig in the realtek folder Justin Lai
2024-06-07 8:43 ` [PATCH net-next v20 13/13] MAINTAINERS: Add the rtase ethernet driver entry Justin Lai
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=5835ed19887d4b5fae93c54c1704fa2b@realtek.com \
--to=justinlai0215@realtek.com \
--cc=andrew@lunn.ch \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=horms@kernel.org \
--cc=jiri@resnulli.us \
--cc=kuba@kernel.org \
--cc=larry.chiu@realtek.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=pkshih@realtek.com \
--cc=rkannoth@marvell.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).