Commit f4b2fa2c authored by Felix Fietkau's avatar Felix Fietkau Committed by Jakub Kicinski
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net: ethernet: mtk_eth_soc: drop packets to WDMA if the ring is full 



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

Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20221116080734.44013-3-nbd@nbd.name


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent c30e0b9b

drivers/net/ethernet/mediatek/mtk_eth_soc.c

+4 −1
Original line number Diff line number Diff line
@@ -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);

drivers/net/ethernet/mediatek/mtk_eth_soc.h

+1 −0
Original line number Diff line number Diff line
@@ -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))