From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.136]) by mail.toke.dk (Postfix) with ESMTPS id E3F77A43CFF for ; Tue, 5 Dec 2023 22:11:29 +0100 (CET) Authentication-Results: mail.toke.dk; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=MpWjJqAY DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701810690; x=1733346690; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=sQldnflb2ClDEwJnCZgJdBGgWR7nOfuEySyZVxba8o0=; b=MpWjJqAYQs4zn+CB1tEMjMXGhPOd3FQaoEsMOrjD4rqNFZowcHVu4CwO KKuibleJ1BB68kFRbMwsqBwJe3QT6yr1hIA5RSTnGI+28llKnglSnczo7 72HdKLPRTWMgQ2+oryhjIltWPWZ3wdp3UIOFZ56EGJKZDeCTCq8/iZgRK 1IJenA61bvxakH96Ou/CQ4OR4NuQqfvWHNieJy5XDYd4W5jI/aoUM1ZjB yfw5dmmXV05m0zicb3KURwleC5a5d6oFB86iCSmiBQd3FYs/SNEtzvU7m PQReDtaAfScoXBSSGRzsviF3A8iR/h3SfSOng7XEJ8vR0/F7YmIJAGUG1 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10915"; a="373421983" X-IronPort-AV: E=Sophos;i="6.04,253,1695711600"; d="scan'208";a="373421983" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Dec 2023 13:11:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10915"; a="774757880" X-IronPort-AV: E=Sophos;i="6.04,253,1695711600"; d="scan'208";a="774757880" Received: from irvmail002.ir.intel.com ([10.43.11.120]) by fmsmga007.fm.intel.com with ESMTP; 05 Dec 2023 13:11:21 -0800 Received: from lincoln.igk.intel.com (lincoln.igk.intel.com [10.102.21.235]) by irvmail002.ir.intel.com (Postfix) with ESMTP id 15F253433E; Tue, 5 Dec 2023 21:11:19 +0000 (GMT) From: Larysa Zaremba To: bpf@vger.kernel.org Date: Tue, 5 Dec 2023 22:08:42 +0100 Message-ID: <20231205210847.28460-14-larysa.zaremba@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231205210847.28460-1-larysa.zaremba@intel.com> References: <20231205210847.28460-1-larysa.zaremba@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-ID-Hash: GWYZGREPFD6ACZODOZ3ZOE436CNHGXDI X-Message-ID-Hash: GWYZGREPFD6ACZODOZ3ZOE436CNHGXDI X-MailFrom: larysa.zaremba@intel.com X-Mailman-Rule-Hits: member-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address CC: Larysa Zaremba , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, David Ahern , Jakub Kicinski , Willem de Bruijn , Jesper Dangaard Brouer , Anatoly Burakov , Alexander Lobakin , Magnus Karlsson , Maryam Tahhan , xdp-hints@xdp-project.net, netdev@vger.kernel.org, Willem de Bruijn , Alexei Starovoitov , Tariq Toukan , Saeed Mahameed , Maciej Fijalkowski , Jesper Dangaard Brouer X-Mailman-Version: 3.3.8 Precedence: list Subject: [xdp-hints] [PATCH bpf-next v8 13/18] net: make vlan_get_tag() return -ENODATA instead of -EINVAL List-Id: XDP hardware hints design discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: __vlan_hwaccel_get_tag() is used in veth XDP hints implementation, its return value (-EINVAL if skb is not VLAN tagged) is passed to bpf code, but XDP hints specification requires drivers to return -ENODATA, if a hint cannot be provided for a particular packet. Solve this inconsistency by changing error return value of __vlan_hwaccel_get_tag() from -EINVAL to -ENODATA, do the same thing to __vlan_get_tag(), because this function is supposed to follow the same convention. This, in turn, makes -ENODATA the only non-zero value vlan_get_tag() can return. We can do this with no side effects, because none of the users of the 3 above-mentioned functions rely on the exact value. Suggested-by: Jesper Dangaard Brouer Acked-by: Stanislav Fomichev Signed-off-by: Larysa Zaremba --- include/linux/if_vlan.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index 3028af87716e..c1645c86eed9 100644 --- a/include/linux/if_vlan.h +++ b/include/linux/if_vlan.h @@ -540,7 +540,7 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb); if (!eth_type_vlan(veth->h_vlan_proto)) - return -EINVAL; + return -ENODATA; *vlan_tci = ntohs(veth->h_vlan_TCI); return 0; @@ -561,7 +561,7 @@ static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, return 0; } else { *vlan_tci = 0; - return -EINVAL; + return -ENODATA; } } -- 2.41.0