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mengensun 1d0a3bfff9 virtio-net: support XDP when not more queues 
97c2c69e19 support XDP when not more queues
9ce4e3d6d8 use netdev_warn_once to output warn when without enough queues
3dcc1edcbb reduce raw_smp_processor_id() calling in virtnet_xdp_get_sq

[97c2c69e19 desc]
The number of queues implemented by many virtio backends is limited,
especially some machines have a large number of CPUs. In this case, it
is often impossible to allocate a separate queue for
XDP_TX/XDP_REDIRECT, then xdp cannot be loaded to work, even xdp does
not use the XDP_TX/XDP_REDIRECT.

This patch allows XDP_TX/XDP_REDIRECT to run by reuse the existing SQ
with __netif_tx_lock() hold when there are not enough queues.

[9ce4e3d6d8 disc]
This warning is output when virtnet does not have enough queues, but it
only needs to be printed once to inform the user of this situation. It
is not necessary to print it every time. If the user loads xdp
frequently, this log appears too much.

[3dcc1edcbb desc]
smp_processor_id()/raw* will be called once each when not
more queues in virtnet_xdp_get_sq() which is called in
non-preemptible context, so it's safe to call the function
smp_processor_id() once.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
 		2021-12-20 11:46:29 +08:00
Documentation locking/qspinlock: Introduce starvation avoidance into CNA 2021-12-20 11:43:06 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch locking/qspinlock: Introduce llc aware spinlock 2021-12-20 11:43:06 +08:00
block cgroupfs: support for proc and sys 2021-11-01 15:00:06 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS 2021-05-20 16:07:34 +08:00
drivers virtio-net: support XDP when not more queues 2021-12-20 11:46:29 +08:00
fs xfs: fix an ABBA deadlock in xfs_rename 2021-12-10 16:25:39 +08:00
include locking/qspinlock: Rename mcs lock/unlock macros and make them more generic 2021-12-20 11:43:06 +08:00
init tqos/rqm: Tencent Quality Monitor Buffer 2021-10-29 06:51:52 +00:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel locking/qspinlock: Introduce llc aware spinlock 2021-12-20 11:43:06 +08:00
lib bug: Remove redundant condition check in report_bug 2021-05-20 16:07:55 +08:00
mm cgroupfs: support for proc and sys 2021-11-01 15:00:06 +08:00
net netfilter: conntrack: Increase the limit of NF_CT_EXT_NUM to 10 2021-12-10 15:53:24 +08:00
package config: enable CONFIG_NUMA_AWARE_SPINLOCKS default 2021-12-20 11:43:06 +08:00
samples kfifo: fix ternary sign extension bugs 2021-05-20 16:08:01 +08:00
scripts kabi: kabi check support 2021-06-23 07:24:18 +00:00
security security: commoncap: fix -Wstringop-overread warning 2021-05-20 16:07:35 +08:00
sound ALSA: usb: midi: don't return -ENOMEM when usb_urb_ep_type_check fails 2021-05-20 16:07:59 +08:00
tools selftests/x86: Add a syscall_arg_fault_64 test for negative GSBASE 2021-08-17 06:29:11 +00:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-20 16:07:44 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS x86/sgx: Update MAINTAINERS 2021-07-12 08:56:46 +00:00
Makefile Rebase to linux long term 5.4.119 2021-05-20 16:08:02 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0