From: Jakub Kicinski <kuba@kernel.org>
To: Ioana Ciornei <ioana.ciornei@nxp.com>
Cc: "davem@davemloft.net" <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH v2 net-next 0/7] dpaa2-eth: add support for Rx traffic classes
Date: Wed, 20 May 2020 12:12:52 -0700 [thread overview]
Message-ID: <20200520121252.6cee8674@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <VI1PR0402MB3871686102702FC257853855E0B60@VI1PR0402MB3871.eurprd04.prod.outlook.com>
On Wed, 20 May 2020 15:10:42 +0000 Ioana Ciornei wrote:
> DPAA2 has frame queues per each Rx traffic class and the decision from which queue
> to pull frames from is made by the HW based on the queue priority within a channel
> (there is one channel per each CPU).
IOW you're reading the descriptor for the device memory/iomem address
and the HW will return the next descriptor based on configured priority?
Presumably strict priority?
> If this should be modeled in software, then I assume there should be a NAPI instance
> for each traffic class and the stack should know in which order to call the poll()
> callbacks so that the priority is respected.
Right, something like that. But IMHO not needed if HW can serve the
right descriptor upon poll.
next prev parent reply other threads:[~2020-05-20 19:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 18:47 [PATCH v2 net-next 0/7] dpaa2-eth: add support for Rx traffic classes Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 1/7] dpaa2-eth: Add " Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 2/7] dpaa2-eth: Trim debugfs FQ stats Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 3/7] dpaa2-eth: Distribute ingress frames based on VLAN prio Ioana Ciornei
2020-05-15 23:07 ` kbuild test robot
2020-05-15 18:47 ` [PATCH v2 net-next 4/7] dpaa2-eth: Add helper functions Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 5/7] dpaa2-eth: Minor cleanup in dpaa2_eth_set_rx_taildrop() Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 6/7] dpaa2-eth: Add congestion group taildrop Ioana Ciornei
2020-05-15 18:47 ` [PATCH v2 net-next 7/7] dpaa2-eth: Update FQ taildrop threshold and buffer pool count Ioana Ciornei
2020-05-15 19:20 ` [PATCH v2 net-next 0/7] dpaa2-eth: add support for Rx traffic classes Jakub Kicinski
2020-05-15 19:31 ` Ioana Ciornei
2020-05-15 19:40 ` Jakub Kicinski
2020-05-15 20:48 ` Ioana Ciornei
2020-05-15 22:25 ` Jakub Kicinski
2020-05-15 23:33 ` David Miller
2020-05-16 8:16 ` Ioana Ciornei
2020-05-18 19:35 ` Jakub Kicinski
2020-05-19 7:38 ` Ioana Ciornei
2020-05-19 18:43 ` Jakub Kicinski
2020-05-19 20:58 ` Ioana Ciornei
2020-05-19 21:35 ` Jakub Kicinski
2020-05-20 15:10 ` Ioana Ciornei
2020-05-20 19:12 ` Jakub Kicinski [this message]
2020-05-20 20:24 ` Ioana Ciornei
2020-05-21 19:07 ` Jakub Kicinski
2020-05-22 13:58 ` Ioana Ciornei
2020-05-29 11:45 ` Ioana Ciornei
2020-05-29 19:40 ` Jakub Kicinski
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