From: Mina Almasry <almasrymina@google.com>
To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org,
linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, bpf@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org,
dri-devel@lists.freedesktop.org
Cc: "Mina Almasry" <almasrymina@google.com>,
"Donald Hunter" <donald.hunter@gmail.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Ivan Kokshaysky" <ink@jurassic.park.msu.ru>,
"Matt Turner" <mattst88@gmail.com>,
"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
"Helge Deller" <deller@gmx.de>,
"Andreas Larsson" <andreas@gaisler.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Masami Hiramatsu" <mhiramat@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Steffen Klassert" <steffen.klassert@secunet.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"David Ahern" <dsahern@kernel.org>,
"Willem de Bruijn" <willemdebruijn.kernel@gmail.com>,
"Shuah Khan" <shuah@kernel.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Pavel Begunkov" <asml.silence@gmail.com>,
"David Wei" <dw@davidwei.uk>, "Jason Gunthorpe" <jgg@ziepe.ca>,
"Yunsheng Lin" <linyunsheng@huawei.com>,
"Shailend Chand" <shailend@google.com>,
"Harshitha Ramamurthy" <hramamurthy@google.com>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"Jeroen de Borst" <jeroendb@google.com>,
"Praveen Kaligineedi" <pkaligineedi@google.com>
Subject: [PATCH net-next v9 01/14] netdev: add netdev_rx_queue_restart()
Date: Fri, 10 May 2024 16:21:12 -0700 [thread overview]
Message-ID: <20240510232128.1105145-2-almasrymina@google.com> (raw)
In-Reply-To: <20240510232128.1105145-1-almasrymina@google.com>
Add netdev_rx_queue_restart() function to netdev_rx_queue.h
Signed-off-by: David Wei <dw@davidwei.uk>
Signed-off-by: Mina Almasry <almasrymina@google.com>
---
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..b3899358e5a9c
--- /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->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
+ * 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;
+}
--
2.45.0.118.g7fe29c98d7-goog
next prev parent reply other threads:[~2024-05-10 23:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-10 23:21 [PATCH net-next v9 00/14] Device Memory TCP Mina Almasry
2024-05-10 23:21 ` Mina Almasry [this message]
2024-05-10 23:21 ` [PATCH net-next v9 02/14] net: page_pool: create hooks for custom page providers Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 03/14] net: netdev netlink api to bind dma-buf to a net device Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 04/14] netdev: support binding dma-buf to netdevice Mina Almasry
2024-05-15 10:01 ` Nikolay Aleksandrov
2024-05-15 10:19 ` Nikolay Aleksandrov
2024-05-18 18:46 ` David Wei
2024-05-29 19:49 ` Mina Almasry
2024-05-18 18:57 ` David Wei
2024-05-10 23:21 ` [PATCH net-next v9 05/14] netdev: netdevice devmem allocator Mina Almasry
2024-05-18 0:39 ` David Wei
2024-05-10 23:21 ` [PATCH net-next v9 06/14] page_pool: convert to use netmem Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 07/14] page_pool: devmem support Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 08/14] memory-provider: dmabuf devmem memory provider Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 09/14] net: support non paged skb frags Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 10/14] net: add support for skbs with unreadable frags Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 11/14] tcp: RX path for devmem TCP Mina Almasry
2024-05-23 6:02 ` David Wei
2024-05-28 17:36 ` Mina Almasry
2024-05-29 2:42 ` Pavel Begunkov
2024-05-29 17:20 ` Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 12/14] net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags Mina Almasry
2024-05-15 9:52 ` Nikolay Aleksandrov
2024-05-10 23:21 ` [PATCH net-next v9 13/14] net: add devmem TCP documentation Mina Almasry
2024-05-10 23:21 ` [PATCH net-next v9 14/14] selftests: add ncdevmem, netcat for devmem TCP Mina Almasry
2024-05-13 23:31 ` [PATCH net-next v9 00/14] Device Memory TCP Jakub Kicinski
2024-05-14 17:15 ` Mina Almasry
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