linux-kernel - [PATCH bpf 1/2] selftests/xsk: properly handle batch ending in the middle of a packet

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Message-ID: <20260203155103.2305816-2-larysa.zaremba@intel.com>
Date: Tue,  3 Feb 2026 16:50:57 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	"Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@...tlin.com>,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	Larysa Zaremba <larysa.zaremba@...el.com>,
	Tushar Vyavahare <tushar.vyavahare@...el.com>,
	Ricardo B. Marlière <rbm@...e.com>,
	Jason Xing <kernelxing@...cent.com>,
	Magnus Karlsson <magnus.karlsson@...el.com>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Alexander Lobakin <aleksander.lobakin@...el.com>
Subject: [PATCH bpf 1/2] selftests/xsk: properly handle batch ending in the middle of a packet

Referenced commit reduced the scope of the variable pkt, so now it has to
be reinitialized via pkt_stream_get_next_rx_pkt(), which also increments
some counters. When the packet is interrupted by the batch ending, pkt
stream therefore proceeds to the next packet, while xsk ring still contains
the previous one, this results in a pkt_nb mismatch.

Decrement the affected counters when packet is interrupted.

Fixes: 8913e653e9b8 ("selftests/xsk: Iterate over all the sockets in the receive pkts function")
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
 tools/testing/selftests/bpf/prog_tests/test_xsk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/test_xsk.c b/tools/testing/selftests/bpf/prog_tests/test_xsk.c
index 5af28f359cfd..69a5a9a5189b 100644
--- a/tools/testing/selftests/bpf/prog_tests/test_xsk.c
+++ b/tools/testing/selftests/bpf/prog_tests/test_xsk.c
@@ -1090,6 +1090,8 @@ static int __receive_pkts(struct test_spec *test, struct xsk_socket_info *xsk)
 			xsk_ring_prod__cancel(&umem->fq, nb_frags);
 		}
 		frags_processed -= nb_frags;
+		pkt_stream_cancel(pkt_stream);
+		pkts_sent--;
 	}
 
 	if (ifobj->use_fill_ring)
-- 
2.52.0