netdev - [PATCH net-next v2 0/2] page_pool: bnxt_en: unlink old page pool in queue api using helper

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Date: Wed, 26 Jun 2024 20:01:58 -0700
From: David Wei <dw@...idwei.uk>
To: Michael Chan <michael.chan@...adcom.com>,
	Andy Gospodarek <andrew.gospodarek@...adcom.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 0/2] page_pool: bnxt_en: unlink old page pool in queue api using helper

56ef27e3 unexported page_pool_unlink_napi() and renamed it to
page_pool_disable_direct_recycling(). This is because there was no
in-tree user of page_pool_unlink_napi().

Since then Rx queue API and an implementation in bnxt got merged. In the
bnxt implementation, it broadly follows the following steps: allocate
new queue memory + page pool, stop old rx queue, swap, then destroy old
queue memory + page pool.

The existing NAPI instance is re-used so when the old page pool that is
no longer used but still linked to this shared NAPI instance is
destroyed, it will trigger warnings.

In my initial patches I unlinked a page pool from a NAPI instance
directly. Instead, export page_pool_disable_direct_recycling() and call
that instead to avoid having a driver touch a core struct.

David Wei (2):
  page_pool: export page_pool_disable_direct_recycling()
  bnxt_en: unlink page pool when stopping Rx queue

 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 +-----
 include/net/page_pool/types.h             | 1 +
 net/core/page_pool.c                      | 3 ++-
 3 files changed, 4 insertions(+), 6 deletions(-)

-- 
2.43.0