From patchwork Wed Mar 15 07:04:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 13175445 X-Patchwork-Delegate: kuba@kernel.org 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 A1629C76196 for ; Wed, 15 Mar 2023 07:05:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231569AbjCOHEy (ORCPT ); Wed, 15 Mar 2023 03:04:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231578AbjCOHEl (ORCPT ); Wed, 15 Mar 2023 03:04:41 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 30BB36A42; Wed, 15 Mar 2023 00:04:40 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.98,262,1673881200"; d="scan'208";a="152643869" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 15 Mar 2023 16:04:39 +0900 Received: from localhost.localdomain (unknown [10.166.15.32]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 7E369418A971; Wed, 15 Mar 2023 16:04:39 +0900 (JST) From: Yoshihiro Shimoda To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda , Volodymyr Babchuk Subject: [PATCH net 1/2] net: renesas: rswitch: Fix the output value of quote from rswitch_rx() Date: Wed, 15 Mar 2023 16:04:23 +0900 Message-Id: <20230315070424.1088877-2-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230315070424.1088877-1-yoshihiro.shimoda.uh@renesas.com> References: <20230315070424.1088877-1-yoshihiro.shimoda.uh@renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org If the RX descriptor doesn't have any data, the output value of quote from rswitch_rx() will be increased unexpectedily. So, fix it. Reported-by: Volodymyr Babchuk Fixes: 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"") Signed-off-by: Yoshihiro Shimoda --- drivers/net/ethernet/renesas/rswitch.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c index 853394e5bb8b..46d8d9c8fc19 100644 --- a/drivers/net/ethernet/renesas/rswitch.c +++ b/drivers/net/ethernet/renesas/rswitch.c @@ -702,13 +702,14 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) u16 pkt_len; u32 get_ts; + if (*quota <= 0) + return true; + boguscnt = min_t(int, gq->ring_size, *quota); limit = boguscnt; desc = &gq->rx_ring[gq->cur]; while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) { - if (--boguscnt < 0) - break; dma_rmb(); pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS; skb = gq->skbs[gq->cur]; @@ -734,6 +735,9 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) gq->cur = rswitch_next_queue_index(gq, true, 1); desc = &gq->rx_ring[gq->cur]; + + if (--boguscnt <= 0) + break; } num = rswitch_get_num_cur_queues(gq); @@ -745,7 +749,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) goto err; gq->dirty = rswitch_next_queue_index(gq, false, num); - *quota -= limit - (++boguscnt); + *quota -= limit - boguscnt; return boguscnt <= 0;