From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7682CC433FE for ; Tue, 12 Apr 2022 06:56:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351258AbiDLG6C (ORCPT ); Tue, 12 Apr 2022 02:58:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351195AbiDLGxA (ORCPT ); Tue, 12 Apr 2022 02:53:00 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 498492CCB3; Mon, 11 Apr 2022 23:40:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 08529B81B4A; Tue, 12 Apr 2022 06:40:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57E5AC385A1; Tue, 12 Apr 2022 06:40:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649745604; bh=K14pv6SWdpUpksvOUluO/3t60x4qannAFeSF9s4j8is=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W65+8oTLghHhGS7eXoDLiRolQmdhxUrPsr7COHUoVo3aP1TeWGf9EslzDBHn527jF yDkbFgqL8N8cmX8w+D7KEbWYGnD7mgIDWkPyJNMcEreeX5pCX7jh4tjJOyWPZRWYHE lhG3QBjBTUec5UwjScfaQKWv4SpYFPqecX6tIjiU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maciej Fijalkowski , Shwetha Nagaraju , Tony Nguyen , Sasha Levin Subject: [PATCH 5.10 117/171] ice: synchronize_rcu() when terminating rings Date: Tue, 12 Apr 2022 08:30:08 +0200 Message-Id: <20220412062931.271224763@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220412062927.870347203@linuxfoundation.org> References: <20220412062927.870347203@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Maciej Fijalkowski [ Upstream commit f9124c68f05ffdb87a47e3ea6d5fae9dad7cb6eb ] Unfortunately, the ice driver doesn't respect the RCU critical section that XSK wakeup is surrounded with. To fix this, add synchronize_rcu() calls to paths that destroy resources that might be in use. This was addressed in other AF_XDP ZC enabled drivers, for reference see for example commit b3873a5be757 ("net/i40e: Fix concurrency issues between config flow and XSK") Fixes: efc2214b6047 ("ice: Add support for XDP") Fixes: 2d4238f55697 ("ice: Add support for AF_XDP") Signed-off-by: Maciej Fijalkowski Tested-by: Shwetha Nagaraju Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/ice/ice.h | 2 +- drivers/net/ethernet/intel/ice/ice_main.c | 4 +++- drivers/net/ethernet/intel/ice/ice_xsk.c | 4 +++- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h index 6a57b41ddb54..7794703c1359 100644 --- a/drivers/net/ethernet/intel/ice/ice.h +++ b/drivers/net/ethernet/intel/ice/ice.h @@ -498,7 +498,7 @@ static inline struct ice_pf *ice_netdev_to_pf(struct net_device *netdev) static inline bool ice_is_xdp_ena_vsi(struct ice_vsi *vsi) { - return !!vsi->xdp_prog; + return !!READ_ONCE(vsi->xdp_prog); } static inline void ice_set_ring_xdp(struct ice_ring *ring) diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 20c9d55f3adc..eb0625b52e45 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -2475,8 +2475,10 @@ int ice_destroy_xdp_rings(struct ice_vsi *vsi) for (i = 0; i < vsi->num_xdp_txq; i++) if (vsi->xdp_rings[i]) { - if (vsi->xdp_rings[i]->desc) + if (vsi->xdp_rings[i]->desc) { + synchronize_rcu(); ice_free_tx_ring(vsi->xdp_rings[i]); + } kfree_rcu(vsi->xdp_rings[i], rcu); vsi->xdp_rings[i] = NULL; } diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c index 9f36f8d7a985..5733526fa245 100644 --- a/drivers/net/ethernet/intel/ice/ice_xsk.c +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c @@ -36,8 +36,10 @@ static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx) static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx) { ice_clean_tx_ring(vsi->tx_rings[q_idx]); - if (ice_is_xdp_ena_vsi(vsi)) + if (ice_is_xdp_ena_vsi(vsi)) { + synchronize_rcu(); ice_clean_tx_ring(vsi->xdp_rings[q_idx]); + } ice_clean_rx_ring(vsi->rx_rings[q_idx]); } -- 2.35.1