| From b204d76e9a64ec99f0151b7ca018f3b6df2bb1b7 Mon Sep 17 00:00:00 2001 |
| From: Camelia Groza <camelia.groza@nxp.com> |
| 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 <camelia.groza@nxp.com> |
| --- |
| 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) { |