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 X-Spam-Level: X-Spam-Status: No, score=-20.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA379C433DB for ; Fri, 29 Jan 2021 20:07:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BA0864E00 for ; Fri, 29 Jan 2021 20:07:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233176AbhA2UHx (ORCPT ); Fri, 29 Jan 2021 15:07:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233054AbhA2Tyd (ORCPT ); Fri, 29 Jan 2021 14:54:33 -0500 Received: from mail-qk1-x72a.google.com (mail-qk1-x72a.google.com [IPv6:2607:f8b0:4864:20::72a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D09EAC061786; Fri, 29 Jan 2021 11:52:53 -0800 (PST) Received: by mail-qk1-x72a.google.com with SMTP id l27so9916293qki.9; Fri, 29 Jan 2021 11:52:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Vyq09P2oaw4x3jWLZrbHOYVErJkNHGPbbt0QMfukTA8=; b=EWpHtNoDMUUeXcnysJV8JAIvqMx4R+wgEvPgCKBI8VToZ/Me6fxwUVz9OepKufoXDf YzkrknxHNvcl8lHQyeSsaLgJ1w5D+O74Vls3lhjLYwoMzGIQtuPhtCjKavyoB7hUe2Ix rW/MUgQx1aO/jfCE5+Uoco7PEk+d/wpATgefQK7a5qUpU08rbykwbAEHZW/4F4uFblD+ AWDuqItYTezIRGGHgRuJE+5hJCblqrg/3Of3WUhb+TNEsLI1EQx77o3w/FBd536wArtY wdPkLZMGHZGHFHEvNnAdY52GU+/VaAU1Hku8dRej0K/JbHlgJuUVlaECpGy9cqffSj7E s7Rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Vyq09P2oaw4x3jWLZrbHOYVErJkNHGPbbt0QMfukTA8=; b=mTY5j/+U9Bs/oz1PqaVr3U7xAGPGm6BMcgnn0+yeHbfyxlqNTJvT35ZKGJtthNQ8rF WN5mf/WfPJDPY2uef9fNwffPiWsJYfIEkRQTlJUdlq6jtSA6Gk93Doj77qhClGX/OVNX VnW1uwc7bXkkcFYRgOozu74cLQGIqya24WG6FWEHR0QseLjbcURynBeIXn3gUk7KiisH WAysJONpNlqBlUzGXiT4sLNl6VXLTEgiM/0+R5TPYGzmXVKrgqODB72wSDS/M2RLhkbV jPN+WRwp+C0vEbChkh8sjvx1RnL1f+29mm7IhKJNkE+yB4kfnZKgzQ7denVS/6sOS+wp Qkrw== X-Gm-Message-State: AOAM532jxa2X4gMhD5unHOPLm28yiMRO1zqVN+IfV+v+423SCQPb4d8x UGBnje5yCjX5pGbeY4Rm9Zk= X-Google-Smtp-Source: ABdhPJwB6AJX7wUheibDZ4Eqpb8ln/ktwLaAwBbuBGORYTS4/5y1Qj2eLGUfr3NGOOr0TmwTRK1r0A== X-Received: by 2002:a37:b07:: with SMTP id 7mr5904648qkl.164.1611949972942; Fri, 29 Jan 2021 11:52:52 -0800 (PST) Received: from localhost.localdomain ([198.52.185.246]) by smtp.gmail.com with ESMTPSA id s136sm6558994qka.106.2021.01.29.11.52.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Jan 2021 11:52:52 -0800 (PST) From: Sven Van Asbroeck X-Google-Original-From: Sven Van Asbroeck To: Bryan Whitehead , UNGLinuxDriver@microchip.com, David S Miller , Jakub Kicinski Cc: Sven Van Asbroeck , Andrew Lunn , Alexey Denisov , Sergej Bauer , Tim Harvey , =?UTF-8?q?Anders=20R=C3=B8nningen?= , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v1 6/6] TEST ONLY: lan743x: skb_trim failure test Date: Fri, 29 Jan 2021 14:52:40 -0500 Message-Id: <20210129195240.31871-7-TheSven73@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210129195240.31871-1-TheSven73@gmail.com> References: <20210129195240.31871-1-TheSven73@gmail.com> 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: Sven Van Asbroeck Simulate low-memory in lan743x_rx_trim_skb(): fail one allocation in every 100. Signed-off-by: Sven Van Asbroeck --- Tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git # 46eb3c108fe1 To: Bryan Whitehead To: UNGLinuxDriver@microchip.com To: "David S. Miller" To: Jakub Kicinski Cc: Andrew Lunn Cc: Alexey Denisov Cc: Sergej Bauer Cc: Tim Harvey Cc: Anders Rønningen Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org (open list) drivers/net/ethernet/microchip/lan743x_main.c | 28 ++++++++----------- 1 file changed, 11 insertions(+), 17 deletions(-) diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c index 149b482fd984..dfae7745094b 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -1963,20 +1963,7 @@ static void lan743x_rx_update_tail(struct lan743x_rx *rx, int index) index); } -static struct sk_buff * -lan743x_alloc_skb(struct net_device *netdev, int length, bool can_fail) -{ - static int rx_alloc; - int counter = rx_alloc++ % 100; - - if (can_fail && counter >= 20 && counter < 30) - return NULL; - - return __netdev_alloc_skb(netdev, length, GFP_ATOMIC | GFP_DMA); -} - -static int -lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index, bool can_fail) +static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index) { struct net_device *netdev = rx->adapter->netdev; struct device *dev = &rx->adapter->pdev->dev; @@ -1990,7 +1977,7 @@ lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index, bool can_fail) descriptor = &rx->ring_cpu_ptr[index]; buffer_info = &rx->buffer_info[index]; - skb = lan743x_alloc_skb(netdev, length, can_fail); + skb = __netdev_alloc_skb(netdev, length, GFP_ATOMIC | GFP_DMA); if (!skb) return -ENOMEM; dma_ptr = dma_map_single(dev, skb->data, length, DMA_FROM_DEVICE); @@ -2058,6 +2045,13 @@ static void lan743x_rx_release_ring_element(struct lan743x_rx *rx, int index) static struct sk_buff * lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length) { + static int trim_cnt; + + if ((trim_cnt++ % 100) == 77) { + dev_kfree_skb_irq(skb); + return NULL; + } + if (skb_linearize(skb)) { dev_kfree_skb_irq(skb); return NULL; @@ -2143,7 +2137,7 @@ static int lan743x_rx_process_packet(struct lan743x_rx *rx) skb = buffer_info->skb; /* allocate new skb and map to dma */ - if (lan743x_rx_init_ring_element(rx, rx->last_head, true)) { + if (lan743x_rx_init_ring_element(rx, rx->last_head)) { /* failed to allocate next skb. * Memory is very low. * Drop this packet and reuse buffer. @@ -2343,7 +2337,7 @@ static int lan743x_rx_ring_init(struct lan743x_rx *rx) rx->last_head = 0; for (index = 0; index < rx->ring_size; index++) { - ret = lan743x_rx_init_ring_element(rx, index, false); + ret = lan743x_rx_init_ring_element(rx, index); if (ret) goto cleanup; } -- 2.17.1