From: Eric Dumazet edumazet@google.com
[ Upstream commit f8d7408a4d7f60f8b2df0f81decdc882dd9c20dc ]
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 Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- 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 3e5f2f7a155e1..c232f16120830 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;