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Message-ID: <8cd3af33-3a86-478a-a5ac-462c2cca732a@gmail.com>
Date: Mon, 17 Jun 2024 14:20:42 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
linux-alpha@...r.kernel.org, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, sparclinux@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Donald Hunter <donald.hunter@...il.com>,
Jonathan Corbet <corbet@....net>,
Richard Henderson <richard.henderson@...aro.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner
<mattst88@...il.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
Sergey Shtylyov <s.shtylyov@....ru>, Jesper Dangaard Brouer
<hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
<mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman
<eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, Steffen Klassert
<steffen.klassert@...unet.com>, Herbert Xu <herbert@...dor.apana.org.au>,
David Ahern <dsahern@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Shuah Khan <shuah@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Bagas Sanjaya <bagasdotme@...il.com>, Christoph Hellwig <hch@...radead.org>,
Nikolay Aleksandrov <razor@...ckwall.org>, David Wei <dw@...idwei.uk>,
Jason Gunthorpe <jgg@...pe.ca>, Yunsheng Lin <linyunsheng@...wei.com>,
Shailend Chand <shailend@...gle.com>,
Harshitha Ramamurthy <hramamurthy@...gle.com>,
Shakeel Butt <shakeel.butt@...ux.dev>, Jeroen de Borst
<jeroendb@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [PATCH net-next v12 01/13] netdev: add netdev_rx_queue_restart()
On 6/13/24 02:35, Mina Almasry wrote:
> Add netdev_rx_queue_restart() function to netdev_rx_queue.h
see nit below
Reviewed-by: Pavel Begunkov <asml.silence@...il.com>
> Signed-off-by: David Wei <dw@...idwei.uk>
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>
> ---
>
> v11:
> - Fix not checking dev->queue_mgmt_ops (Pavel).
> - Fix ndo_queue_mem_free call that passed the wrong pointer (David).
>
> v9: https://lore.kernel.org/all/20240502045410.3524155-4-dw@davidwei.uk/
> (submitted by David).
> - fixed SPDX license identifier (Simon).
> - Rebased on top of merged queue API definition, and changed
> implementation to match that.
> - Replace rtnl_lock() with rtnl_is_locked() to make it useable from my
> netlink code where rtnl is already locked.
>
> ---
> include/net/netdev_rx_queue.h | 3 ++
> net/core/Makefile | 1 +
> net/core/netdev_rx_queue.c | 74 +++++++++++++++++++++++++++++++++++
> 3 files changed, 78 insertions(+)
> create mode 100644 net/core/netdev_rx_queue.c
>
> diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
> index aa1716fb0e53c..e78ca52d67fbf 100644
> --- a/include/net/netdev_rx_queue.h
> +++ b/include/net/netdev_rx_queue.h
> @@ -54,4 +54,7 @@ get_netdev_rx_queue_index(struct netdev_rx_queue *queue)
> return index;
> }
> #endif
> +
> +int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq);
> +
> #endif
> diff --git a/net/core/Makefile b/net/core/Makefile
> index 62be9aef25285..f82232b358a2c 100644
> --- a/net/core/Makefile
> +++ b/net/core/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_NETDEV_ADDR_LIST_TEST) += dev_addr_lists_test.o
>
> obj-y += net-sysfs.o
> obj-y += hotdata.o
> +obj-y += netdev_rx_queue.o
> obj-$(CONFIG_PAGE_POOL) += page_pool.o page_pool_user.o
> obj-$(CONFIG_PROC_FS) += net-procfs.o
> obj-$(CONFIG_NET_PKTGEN) += pktgen.o
> diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c
> new file mode 100644
> index 0000000000000..de0575cf6df5d
> --- /dev/null
> +++ b/net/core/netdev_rx_queue.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/netdevice.h>
> +#include <net/netdev_queues.h>
> +#include <net/netdev_rx_queue.h>
> +
> +int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx)
> +{
> + void *new_mem, *old_mem;
> + int err;
> +
> + if (!dev->queue_mgmt_ops || !dev->queue_mgmt_ops->ndo_queue_stop ||
> + !dev->queue_mgmt_ops->ndo_queue_mem_free ||
> + !dev->queue_mgmt_ops->ndo_queue_mem_alloc ||
> + !dev->queue_mgmt_ops->ndo_queue_start)
> + return -EOPNOTSUPP;
> +
> + DEBUG_NET_WARN_ON_ONCE(!rtnl_is_locked());
> +
> + new_mem = kvzalloc(dev->queue_mgmt_ops->ndo_queue_mem_size, GFP_KERNEL);
> + if (!new_mem)
> + return -ENOMEM;
> +
> + old_mem = kvzalloc(dev->queue_mgmt_ops->ndo_queue_mem_size, GFP_KERNEL);
> + if (!old_mem) {
> + err = -ENOMEM;
> + goto err_free_new_mem;
> + }
> +
> + err = dev->queue_mgmt_ops->ndo_queue_mem_alloc(dev, new_mem, rxq_idx);
> + if (err)
> + goto err_free_old_mem;
> +
> + err = dev->queue_mgmt_ops->ndo_queue_stop(dev, old_mem, rxq_idx);
> + if (err)
> + goto err_free_new_queue_mem;
> +
> + err = dev->queue_mgmt_ops->ndo_queue_start(dev, new_mem, rxq_idx);
> + if (err)
> + goto err_start_queue;
> +
> + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, old_mem);
> +
> + kvfree(old_mem);
> + kvfree(new_mem);
> +
> + return 0;
> +
> +err_start_queue:
> + /* Restarting the queue with old_mem should be successful as we haven't
> + * changed any of the queue configuration, and there is not much we can
> + * do to recover from a failure here.
> + *
> + * WARN if the we fail to recover the old rx queue, and at least free
nit "if the we"
> + * old_mem so we don't also leak that.
> + */
> + if (dev->queue_mgmt_ops->ndo_queue_start(dev, old_mem, rxq_idx)) {
> + WARN(1,
> + "Failed to restart old queue in error path. RX queue %d may be unhealthy.",
> + rxq_idx);
> + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, old_mem);
> + }
> +
> +err_free_new_queue_mem:
> + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, new_mem);
> +
> +err_free_old_mem:
> + kvfree(old_mem);
> +
> +err_free_new_mem:
> + kvfree(new_mem);
> +
> + return err;
> +}
--
Pavel Begunkov
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