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Message-ID: <20230821141659.5f0b71f7@kernel.org> Date: Mon, 21 Aug 2023 14:16:59 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Willem de Bruijn <willemdebruijn.kernel@...il.com> Cc: David Ahern <dsahern@...nel.org>, Mina Almasry <almasrymina@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>, netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Magnus Karlsson <magnus.karlsson@...el.com>, sdf@...gle.com, Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com> Subject: Re: [RFC PATCH v2 02/11] netdev: implement netlink api to bind dma-buf to netdevice On Sat, 19 Aug 2023 10:18:57 -0400 Willem de Bruijn wrote: > Right. Many devices only allow bringing all queues down at the same time. > > Once a descriptor is posted and the ring head is written, there is no > way to retract that. Since waiting for the device to catch up is not > acceptable, the only option is to bring down the queue, right? Which > will imply bringing down the entire device on many devices. Not ideal, > but acceptable short term, imho. > > That may be an incentive for vendors to support per-queue > start/stop/alloc/free. Maybe the ones that support RDMA already do? Are you talking about HW devices, or virt? I thought most HW made in the last 10 years should be able to take down individual queues :o
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