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-rw-r--r--target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
index 17b3ec4a6d..21feeb9ad3 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
@@ -981,6 +981,17 @@ void __init ath79_register_eth(unsigned int id)
pdata->has_gbit = 1;
pdata->is_ar724x = 1;
+ /*
+ * Limit the maximum frame length to 4095 bytes.
+ * Although the documentation says that the hardware
+ * limit is 16383 bytes but that does not work in
+ * practice. It seems that the hardware only updates
+ * the lowest 12 bits of the packet length field
+ * in the RX descriptor.
+ */
+ pdata->max_frame_len = SZ_4K - 1;
+ pdata->desc_pktlen_mask = SZ_16K - 1;
+
if (!pdata->fifo_cfg1)
pdata->fifo_cfg1 = 0x0010ffff;
if (!pdata->fifo_cfg2)