From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 20FED3F23B5; Thu, 19 Mar 2026 17:55:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773942961; cv=none; b=uBEBv6mC5+jXfgp2t2KhJHS2SViVQN1dyLB9wRAmmaATnVotGrtXXHJrExu3hq1tZOdf8LPgxAwTO5cMQZK2R6n2AqQE4pKSUYky8dpLDNfVeU+/V/qwgOi5nrQ0UVksYtYeFLqzbcxqfpw/ztOOjaaAsoxtf1/v1nTirXvYjEs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773942961; c=relaxed/simple; bh=Zl6SZTybvQb61FHPtCHKwUTywcl1kJwzKMiAin73i2g=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BykiD7heqpT6/lMNuj3roj9om4sDA9Hl1XrkyAN/IGd0uwGDGgLb14V9c+GQ6PwpgIEqZhHjgtpQ62DNrClvrL2zd3ilSQjPD927vJ0vu8utR901+gqNFfJWLmCzQfkkGBQ/i922atWgY365k5rjt4BXoWFrUQKCj1BaNbAC9J8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=It5qhL8+; arc=none smtp.client-ip=192.198.163.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="It5qhL8+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1773942959; x=1805478959; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Zl6SZTybvQb61FHPtCHKwUTywcl1kJwzKMiAin73i2g=; b=It5qhL8+TMmeBlaGUo3FqNP6xOHAZ3f7Dd98QGxOOLs6Z8kQvCDAUSG/ kg4/tKktMOEKZEFGw3bVeBaQq3l4sSPMvGDKwRWTrz/0ETciJbpIaLII3 v3mSvav2ySOxSkJrrwfb2uLr7+2lFEYcUiABibJfZTxaefPEPYwTkzyBB O7qwE9VVRqhG3kMnOxPNpYTDxEBa2K/mWwj8Cga+ZTq3XphT2Kvoh9T/L Wrxveo4jILdyvR8mzo6WG26w7cBDzzh8gpvZOmU8VcOj9IFrAecIsCrZW dRDnh6w2mo4pQxVfDgLqVxCZ7vpOReKqk87bIDDPEqeIGaHU7uCaIDBMo w==; X-CSE-ConnectionGUID: uxIUhNxRTyabk0mUjw3Wjw== X-CSE-MsgGUID: WwbJt0MlQGWOcoY/F90gZg== X-IronPort-AV: E=McAfee;i="6800,10657,11734"; a="74038620" X-IronPort-AV: E=Sophos;i="6.23,129,1770624000"; d="scan'208";a="74038620" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Mar 2026 10:55:59 -0700 X-CSE-ConnectionGUID: B/Ulh6wBRh2sJNbYx5qAcQ== X-CSE-MsgGUID: WbWqCdHgRVCIOMRU1CNKvQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,129,1770624000"; d="scan'208";a="246058655" Received: from boxer.igk.intel.com ([10.102.20.173]) by fmviesa002.fm.intel.com with ESMTP; 19 Mar 2026 10:55:57 -0700 From: Maciej Fijalkowski To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, magnus.karlsson@intel.com, stfomichev@gmail.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, larysa.zaremba@intel.com, aleksander.lobakin@intel.com, bjorn@kernel.org, Maciej Fijalkowski Subject: [PATCH v2 net 6/8] selftests: bpf: fix pkt grow tests Date: Thu, 19 Mar 2026 18:55:36 +0100 Message-Id: <20260319175538.479139-7-maciej.fijalkowski@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20260319175538.479139-1-maciej.fijalkowski@intel.com> References: <20260319175538.479139-1-maciej.fijalkowski@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Skip tail adjust tests in xskxceiver for SKB mode as it is not very friendly for it. multi-buffer case does not work as xdp_rxq_info that is registered for generic XDP does not report ::frag_size. The non-mbuf path copies packet via skb_pp_cow_data() which only accounts for headroom, leaving us with no tailroom and causing underlying XDP prog to drop packets therefore. For multi-buffer test on other modes, change the amount of bytes we use for growth, assume worst-case scenario and take care of headroom and tailroom. Signed-off-by: Maciej Fijalkowski --- .../selftests/bpf/prog_tests/test_xsk.c | 25 ++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/test_xsk.c b/tools/testing/selftests/bpf/prog_tests/test_xsk.c index 7e38ec6e656b..95cbbf425e9a 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_xsk.c +++ b/tools/testing/selftests/bpf/prog_tests/test_xsk.c @@ -35,6 +35,7 @@ #define XSK_UMEM__INVALID_FRAME_SIZE (MAX_ETH_JUMBO_SIZE + 1) #define XSK_UMEM__LARGE_FRAME_SIZE (3 * 1024) #define XSK_UMEM__MAX_FRAME_SIZE (4 * 1024) +#define XSK_UMEM__PACKET_TAILROOM 320 static const u8 g_mac[ETH_ALEN] = {0x55, 0x44, 0x33, 0x22, 0x11, 0x00}; @@ -2551,16 +2552,34 @@ int testapp_adjust_tail_shrink_mb(struct test_spec *test) int testapp_adjust_tail_grow(struct test_spec *test) { + if (test->mode == TEST_MODE_SKB) + return TEST_SKIP; + /* Grow by 4 bytes for testing purpose */ return testapp_adjust_tail(test, 4, MIN_PKT_SIZE * 2); } int testapp_adjust_tail_grow_mb(struct test_spec *test) { + u32 grow_size; + + if (test->mode == TEST_MODE_SKB) + return TEST_SKIP; + + /* worst case scenario is when underlying setup will work on 3k + * buffers, let us account for it; given that we will use 6k as + * pkt_len, expect that it will be broken down to 2 descs each + * with 3k payload; + * + * 4k is truesize, 3k payload, 256 HR, 320 TR; + */ + grow_size = XSK_UMEM__MAX_FRAME_SIZE - + XSK_UMEM__LARGE_FRAME_SIZE - + XDP_PACKET_HEADROOM - + XSK_UMEM__PACKET_TAILROOM; test->mtu = MAX_ETH_JUMBO_SIZE; - /* Grow by (frag_size - last_frag_Size) - 1 to stay inside the last fragment */ - return testapp_adjust_tail(test, (XSK_UMEM__MAX_FRAME_SIZE / 2) - 1, - XSK_UMEM__LARGE_FRAME_SIZE * 2); + + return testapp_adjust_tail(test, grow_size, XSK_UMEM__LARGE_FRAME_SIZE * 2); } int testapp_tx_queue_consumer(struct test_spec *test) -- 2.43.0