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