From b204d76e9a64ec99f0151b7ca018f3b6df2bb1b7 Mon Sep 17 00:00:00 2001 From: Camelia Groza Date: Tue, 19 Sep 2017 11:30:50 +0300 Subject: [PATCH] sdk_dpaa: ls1043a errata: restrict the max mtu We can not allow for Jumbo frames and large MTU values on LS1043A due to the A-010022 FMan errata. All outgoing frames larger than 4K bytes are dropped. Signed-off-by: Camelia Groza --- drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c @@ -263,7 +263,16 @@ EXPORT_SYMBOL(dpa_get_stats64); int dpa_change_mtu(struct net_device *net_dev, int new_mtu) { - const int max_mtu = dpa_get_max_mtu(); + int max_mtu = dpa_get_max_mtu(); + +#ifndef CONFIG_PPC + /* Due to the A010022 FMan errata, we can not use contig frames larger + * than 4K, nor S/G frames. We need to prevent the user from setting a + * large MTU. + */ + if (unlikely(dpaa_errata_a010022)) + max_mtu = DPA_BP_RAW_SIZE; +#endif /* Make sure we don't exceed the Ethernet controller's MAXFRM */ if (new_mtu < 68 || new_mtu > max_mtu) {