linux-kernel - [PATCH net-next v2 1/3] net: ti: prueth: Fix kernel warning while bringing down network interface

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Message-ID: <20250321081313.37112-2-m-malladi@ti.com>
Date: Fri, 21 Mar 2025 13:43:11 +0530
From: Meghana Malladi <m-malladi@...com>
To: <pabeni@...hat.com>, <kuba@...nel.org>, <edumazet@...gle.com>,
        <davem@...emloft.net>, <andrew+netdev@...n.ch>
CC: <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <kory.maincent@...tlin.com>, <dan.carpenter@...aro.org>,
        <javier.carrasco.cruz@...il.com>, <diogo.ivo@...mens.com>,
        <jacob.e.keller@...el.com>, <horms@...nel.org>, <m-malladi@...com>,
        <john.fastabend@...il.com>, <hawk@...nel.org>, <daniel@...earbox.net>,
        <ast@...nel.org>, <srk@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Roger
 Quadros <rogerq@...nel.org>, <danishanwar@...com>
Subject: [PATCH net-next v2 1/3] net: ti: prueth: Fix kernel warning while bringing down network interface

During network interface initialization, the NIC driver needs to register
its Rx queue with the XDP, to ensure the incoming XDP buffer carries a
pointer reference to this info and is stored inside xdp_rxq_info.

While this struct isn't tied to XDP prog, if there are any changes in
Rx queue, the NIC driver needs to stop the Rx queue by unregistering
with XDP before purging and reallocating memory. Drop page_pool destroy
during Rx channel reset as this is already handled by XDP during
xdp_rxq_info_unreg (Rx queue unregister), failing to do will cause the
following warning:

warning logs: https://gist.github.com/MeghanaMalladiTI/eb627e5dc8de24e42d7d46572c13e576

Fixes: 46eeb90f03e0 ("net: ti: icssg-prueth: Use page_pool API for RX buffer allocation")
Signed-off-by: Meghana Malladi <m-malladi@...com>
Reviewed-by: Simon Horman <horms@...nel.org>
---

Changes from v1(v2-v1):
- Included more trace logs for the warning
- Collected RB tag from Simon Horman <horms@...nel.org>

 drivers/net/ethernet/ti/icssg/icssg_common.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index df5da7a98abf..afa01c22dee8 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -1216,9 +1216,6 @@ void prueth_reset_rx_chan(struct prueth_rx_chn *chn,
 					  prueth_rx_cleanup, !!i);
 	if (disable)
 		k3_udma_glue_disable_rx_chn(chn->rx_chn);
-
-	page_pool_destroy(chn->pg_pool);
-	chn->pg_pool = NULL;
 }
 EXPORT_SYMBOL_GPL(prueth_reset_rx_chan);
 
-- 
2.43.0