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From:   Sven Van Asbroeck <thesven73@gmail.com>
To:     Bryan Whitehead <bryan.whitehead@microchip.com>,
        UNGLinuxDriver@microchip.com, David S Miller <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Sven Van Asbroeck <thesven73@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Alexey Denisov <rtgbnm@gmail.com>,
        Sergej Bauer <sbauer@blackbox.su>,
        Tim Harvey <tharvey@gateworks.com>,
        =?UTF-8?q?Anders=20R=C3=B8nningen?= <anders@ronningen.priv.no>,
        Hillf Danton <hdanton@sina.com>,
        Christoph Hellwig <hch@lst.de>,
        Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next v3 5/5] TEST ONLY: lan743x: skb_trim failure test
Date:   Mon, 15 Feb 2021 20:08:06 -0500
Message-Id: <20210216010806.31948-6-TheSven73@gmail.com>
In-Reply-To: <20210216010806.31948-1-TheSven73@gmail.com>
References: <20210216010806.31948-1-TheSven73@gmail.com>
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From: Sven Van Asbroeck <thesven73@gmail.com>

Simulate low-memory in lan743x_rx_trim_skb(): fail one allocation
in every 100.

Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com>
---

To: Bryan Whitehead <bryan.whitehead@microchip.com>
To: UNGLinuxDriver@microchip.com
To: "David S. Miller" <davem@davemloft.net>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Alexey Denisov <rtgbnm@gmail.com>
Cc: Sergej Bauer <sbauer@blackbox.su>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Anders Rønningen <anders@ronningen.priv.no>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

 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 6e1b3c996bd7..4751626f4c0f 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, buffer_length, can_fail);
+	skb = __netdev_alloc_skb(netdev, buffer_length, GFP_ATOMIC | GFP_DMA);
 	if (!skb)
 		return -ENOMEM;
 	dma_ptr = dma_map_single(dev, skb->data, buffer_length, DMA_FROM_DEVICE);
@@ -2078,6 +2065,13 @@ 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;
@@ -2152,7 +2146,7 @@ static int lan743x_rx_process_buffer(struct lan743x_rx *rx)
 
 	/* save existing skb, allocate new skb and map to dma */
 	skb = buffer_info->skb;
-	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.
@@ -2357,7 +2351,7 @@ 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