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Commit 1b090a48 authored by Iyappan Subramanian's avatar Iyappan Subramanian Committed by David S. Miller
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drivers: net: xgene: fix ununiform latency across queues 



This patch addresses ununiform latency across queues by adding
more queues to match with, upto number of CPU cores.

Also, number of interrupts are increased and the channel numbers
are reordered.

Signed-off-by: default avatarIyappan Subramanian <isubramanian@apm.com>
Tested-by: default avatarToan Le <toanle@apm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 46a22d29

drivers/net/ethernet/apm/xgene/xgene_enet_main.c

+23 −7
Original line number Diff line number Diff line
@@ -1234,6 +1234,13 @@ static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata) 
	for (i = 0; i < max_irqs; i++) {

		ret = platform_get_irq(pdev, i);

		if (ret <= 0) {

			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {

				max_irqs = i;

				pdata->rxq_cnt = max_irqs / 2;

				pdata->txq_cnt = max_irqs / 2;

				pdata->cq_cnt = max_irqs / 2;

				break;

			}

			dev_err(dev, "Unable to get ENET IRQ\n");

			ret = ret ? : -ENXIO;

			return ret;
@@ -1437,19 +1444,28 @@ static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata) 
		pdata->port_ops = &xgene_xgport_ops;

		pdata->cle_ops = &xgene_cle3in_ops;

		pdata->rm = RM0;

		if (!pdata->rxq_cnt) {

			pdata->rxq_cnt = XGENE_NUM_RX_RING;

			pdata->txq_cnt = XGENE_NUM_TX_RING;

			pdata->cq_cnt = XGENE_NUM_TXC_RING;

		}

		break;

	}



	if (pdata->enet_id == XGENE_ENET1) {

		switch (pdata->port_id) {

		case 0:

			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {

				pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;

				pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;

				pdata->bp_bufnum = X2_START_BP_BUFNUM_0;

				pdata->ring_num = START_RING_NUM_0;

			} else {

				pdata->cpu_bufnum = START_CPU_BUFNUM_0;

				pdata->eth_bufnum = START_ETH_BUFNUM_0;

				pdata->bp_bufnum = START_BP_BUFNUM_0;

				pdata->ring_num = START_RING_NUM_0;

			}

			break;

		case 1:

			if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {

drivers/net/ethernet/apm/xgene/xgene_enet_main.h

+4 −4
Original line number Diff line number Diff line
@@ -49,10 +49,10 @@ 
#define XGENE_ENET_MSS	1448

#define XGENE_MIN_ENET_FRAME_SIZE	60



#define XGENE_MAX_ENET_IRQ	8

#define XGENE_NUM_RX_RING	4

#define XGENE_NUM_TX_RING	4

#define XGENE_NUM_TXC_RING	4

#define XGENE_MAX_ENET_IRQ	16

#define XGENE_NUM_RX_RING	8

#define XGENE_NUM_TX_RING	8

#define XGENE_NUM_TXC_RING	8



#define START_CPU_BUFNUM_0	0

#define START_ETH_BUFNUM_0	2