linux-kernel - [PATCH iwl-net] igc: Fix XSK queue NAPI ID mapping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250305180901.128286-1-jdamato@fastly.com>
Date: Wed,  5 Mar 2025 18:09:00 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: vitaly.lifshits@...el.com,
	avigailx.dahan@...el.com,
	anthony.l.nguyen@...el.com,
	Joe Damato <jdamato@...tly.com>,
	stable@...r.kernel.org,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	bpf@...r.kernel.org (open list:XDP (eXpress Data Path)),
	intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH iwl-net] igc: Fix XSK queue NAPI ID mapping

In commit b65969856d4f ("igc: Link queues to NAPI instances"), the XSK
queues were incorrectly unmapped from their NAPI instances. After
discussion on the mailing list and the introduction of a test to codify
the expected behavior, we can see that the unmapping causes the
check_xsk test to fail:

NETIF=enp86s0 ./tools/testing/selftests/drivers/net/queues.py

[...]
  # Check|     ksft_eq(q.get('xsk', None), {},
  # Check failed None != {} xsk attr on queue we configured
  not ok 4 queues.check_xsk

After this commit, the test passes:

  ok 4 queues.check_xsk

Note that the test itself is only in net-next, so I tested this change
by applying it to my local net-next tree, booting, and running the test.

Cc: stable@...r.kernel.org
Fixes: b65969856d4f ("igc: Link queues to NAPI instances")
Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 drivers/net/ethernet/intel/igc/igc_xdp.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c
index 13bbd3346e01..869815f48ac1 100644
--- a/drivers/net/ethernet/intel/igc/igc_xdp.c
+++ b/drivers/net/ethernet/intel/igc/igc_xdp.c
@@ -86,7 +86,6 @@ static int igc_xdp_enable_pool(struct igc_adapter *adapter,
 		napi_disable(napi);
 	}
 
-	igc_set_queue_napi(adapter, queue_id, NULL);
 	set_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
 	set_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
 
@@ -136,7 +135,6 @@ static int igc_xdp_disable_pool(struct igc_adapter *adapter, u16 queue_id)
 	xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR);
 	clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
 	clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
-	igc_set_queue_napi(adapter, queue_id, napi);
 
 	if (needs_reset) {
 		napi_enable(napi);

base-commit: 3c9231ea6497dfc50ac0ef69fff484da27d0df66
-- 
2.34.1