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From: Eric Dumazet <edumazet@google.com>
To: "David S . Miller" <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	RENARD Pierre-Francois <pfrenard@gmail.com>,
	Stefan Wahren <stefan.wahren@i2se.com>,
	Woojung Huh <woojung.huh@microchip.com>,
	Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
Subject: [PATCH net] net: usb: lan78xx: limit size of local TSO packets
Date: Mon, 13 Jan 2020 09:27:11 -0800	[thread overview]
Message-ID: <20200113172711.122918-1-edumazet@google.com> (raw)

lan78xx_tx_bh() makes sure to not exceed MAX_SINGLE_PACKET_SIZE
bytes in the aggregated packets it builds, but does
nothing to prevent large GSO packets being submitted.

Pierre-Francois reported various hangs when/if TSO is enabled.

For localy generated packets, we can use netif_set_gso_max_size()
to limit the size of TSO packets.

Note that forwarded packets could still hit the issue,
so a complete fix might require implementing .ndo_features_check
for this driver, forcing a software segmentation if the size
of the TSO packet exceeds MAX_SINGLE_PACKET_SIZE.

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: RENARD Pierre-Francois <pfrenard@gmail.com>
Tested-by: RENARD Pierre-Francois <pfrenard@gmail.com>
Cc: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Woojung Huh <woojung.huh@microchip.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
---
 drivers/net/usb/lan78xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index fb4781080d6dec2af22f41c5e064350ea74130b3..75bdfae5f3e20afef3d2880171c7c6e8511546c5 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3750,6 +3750,7 @@ static int lan78xx_probe(struct usb_interface *intf,
 
 	/* MTU range: 68 - 9000 */
 	netdev->max_mtu = MAX_SINGLE_PACKET_SIZE;
+	netif_set_gso_max_size(netdev, MAX_SINGLE_PACKET_SIZE - MAX_HEADER);
 
 	dev->ep_blkin = (intf->cur_altsetting)->endpoint + 0;
 	dev->ep_blkout = (intf->cur_altsetting)->endpoint + 1;
-- 
2.25.0.rc1.283.g88dfdc4193-goog


             reply	other threads:[~2020-01-13 17:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 17:27 Eric Dumazet [this message]
2020-01-14 19:05 ` [PATCH net] net: usb: lan78xx: limit size of local TSO packets David Miller
2020-01-16 14:26 ` James Hughes
2020-01-16 16:05   ` Eric Dumazet
2020-01-16 16:07     ` Eric Dumazet
2020-01-16 21:28       ` James Hughes

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