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net: ethernet: mtk_eth_soc: drop packets to WDMA if the ring is full

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Improves handling of DMA ring overflow.
Clarify other WDMA drop related comment.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20221116080734.44013-3-nbd@nbd.name
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Felix Fietkau 2022-11-16 09:07:30 +01:00 committed by Jakub Kicinski
parent c30e0b9b88
commit f4b2fa2c25
2 changed files with 5 additions and 1 deletions
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5
drivers/net/ethernet/mediatek/mtk_eth_soc.c
View File

@ -3425,9 +3425,12 @@ static int mtk_hw_init(struct mtk_eth *eth)
mtk_w32(eth, 0x21021000, MTK_FE_INT_GRP);
if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
/* PSE should not drop port8 and port9 packets */
/* PSE should not drop port8 and port9 packets from WDMA Tx */
mtk_w32(eth, 0x00000300, PSE_DROP_CFG);
/* PSE should drop packets to port 8/9 on WDMA Rx ring full */
mtk_w32(eth, 0x00000300, PSE_PPE0_DROP);
/* PSE Free Queue Flow Control */
mtk_w32(eth, 0x01fa01f4, PSE_FQFC_CFG2);

1
drivers/net/ethernet/mediatek/mtk_eth_soc.h
View File

@ -127,6 +127,7 @@
#define PSE_FQFC_CFG1 0x100
#define PSE_FQFC_CFG2 0x104
#define PSE_DROP_CFG 0x108
#define PSE_PPE0_DROP 0x110
/* PSE Input Queue Reservation Register*/
#define PSE_IQ_REV(x) (0x140 + (((x) - 1) << 2))