| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From b204d76e9a64ec99f0151b7ca018f3b6df2bb1b7 Mon Sep 17 00:00:00 2001 |
| 2 | From: Camelia Groza <camelia.groza@nxp.com> |
| 3 | Date: Tue, 19 Sep 2017 11:30:50 +0300 |
| 4 | Subject: [PATCH] sdk_dpaa: ls1043a errata: restrict the max mtu |
| 5 | |
| 6 | We can not allow for Jumbo frames and large MTU values on LS1043A due to |
| 7 | the A-010022 FMan errata. All outgoing frames larger than 4K bytes are dropped. |
| 8 | |
| 9 | Signed-off-by: Camelia Groza <camelia.groza@nxp.com> |
| 10 | --- |
| 11 | drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c | 11 ++++++++++- |
| 12 | 1 file changed, 10 insertions(+), 1 deletion(-) |
| 13 | |
| 14 | --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c |
| 15 | +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c |
| 16 | @@ -263,7 +263,16 @@ EXPORT_SYMBOL(dpa_get_stats64); |
| 17 | |
| 18 | int dpa_change_mtu(struct net_device *net_dev, int new_mtu) |
| 19 | { |
| 20 | - const int max_mtu = dpa_get_max_mtu(); |
| 21 | + int max_mtu = dpa_get_max_mtu(); |
| 22 | + |
| 23 | +#ifndef CONFIG_PPC |
| 24 | + /* Due to the A010022 FMan errata, we can not use contig frames larger |
| 25 | + * than 4K, nor S/G frames. We need to prevent the user from setting a |
| 26 | + * large MTU. |
| 27 | + */ |
| 28 | + if (unlikely(dpaa_errata_a010022)) |
| 29 | + max_mtu = DPA_BP_RAW_SIZE; |
| 30 | +#endif |
| 31 | |
| 32 | /* Make sure we don't exceed the Ethernet controller's MAXFRM */ |
| 33 | if (new_mtu < 68 || new_mtu > max_mtu) { |