tree 3d35b4fc04fdd1f7e738cd1e9bfcbeebf4a9df52
parent 799cf407879e45fac3b0476287dc20f582a7055e
author Tejun Heo <tj@kernel.org> 1706836209 -1000
committer Tejun Heo <tj@kernel.org> 1706836209 -1000

net: tcp: tsq: Convert from tasklet to BH workqueue

The only generic interface to execute asynchronously in the BH context is
tasklet; however, it's marked deprecated and has some design flaws. To
replace tasklets, BH workqueue support was recently added. A BH workqueue
behaves similarly to regular workqueues except that the queued work items
are executed in the BH context.

This patch converts TCP Small Queues implementation from tasklet to BH
workqueue.

Semantically, this is an equivalent conversion and there shouldn't be any
user-visible behavior changes. While workqueue's queueing and execution
paths are a bit heavier than tasklet's, unless the work item is being queued
every packet, the difference hopefully shouldn't matter.

My experience with the networking stack is very limited and this patch
definitely needs attention from someone who actually understands networking.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net> (maintainer:NETWORKING [IPv4/IPv6])
Cc: David Ahern <dsahern@kernel.org>
Cc: Jakub Kicinski <kuba@kernel.org> (maintainer:NETWORKING [GENERAL])
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org (open list:NETWORKING [TCP])