From 4b8acdf5fe97d01962f3a62eaff3f010f8de5869 Mon Sep 17 00:00:00 2001 From: "Lendacky, Thomas" Date: Thu, 3 Nov 2016 13:19:17 -0500 Subject: [PATCH] amd-xgbe: Update how to determine DMA channel status Tx and Rx DMA channel status determiniation is different depending on the version of the hardware. Update the channel status processing code to account for the change. Also, reduce the timeout value used when stopping the channels. Signed-off-by: Tom Lendacky Signed-off-by: David S. Miller --- drivers/net/ethernet/amd/xgbe/xgbe-common.h | 4 ++ drivers/net/ethernet/amd/xgbe/xgbe-dev.c | 58 ++++++++++++++------- drivers/net/ethernet/amd/xgbe/xgbe.h | 2 +- 3 files changed, 43 insertions(+), 21 deletions(-) diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-common.h b/drivers/net/ethernet/amd/xgbe/xgbe-common.h index 6c40915d065b..8036ee52add6 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-common.h +++ b/drivers/net/ethernet/amd/xgbe/xgbe-common.h @@ -790,6 +790,10 @@ #define MTL_Q_RQOMR_RSF_WIDTH 1 #define MTL_Q_RQOMR_RTC_INDEX 0 #define MTL_Q_RQOMR_RTC_WIDTH 2 +#define MTL_Q_TQDR_TRCSTS_INDEX 1 +#define MTL_Q_TQDR_TRCSTS_WIDTH 2 +#define MTL_Q_TQDR_TXQSTS_INDEX 4 +#define MTL_Q_TQDR_TXQSTS_WIDTH 1 #define MTL_Q_TQOMR_FTQ_INDEX 0 #define MTL_Q_TQOMR_FTQ_WIDTH 1 #define MTL_Q_TQOMR_Q2TCMAP_INDEX 8 diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c index fbd60ee0260b..0a7ab63deaf9 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c @@ -2944,20 +2944,48 @@ static void xgbe_config_mmc(struct xgbe_prv_data *pdata) XGMAC_IOWRITE_BITS(pdata, MMC_CR, CR, 1); } +static void xgbe_txq_prepare_tx_stop(struct xgbe_prv_data *pdata, + unsigned int queue) +{ + unsigned int tx_status; + unsigned long tx_timeout; + + /* The Tx engine cannot be stopped if it is actively processing + * packets. Wait for the Tx queue to empty the Tx fifo. Don't + * wait forever though... + */ + tx_timeout = jiffies + (XGBE_DMA_STOP_TIMEOUT * HZ); + while (time_before(jiffies, tx_timeout)) { + tx_status = XGMAC_MTL_IOREAD(pdata, queue, MTL_Q_TQDR); + if ((XGMAC_GET_BITS(tx_status, MTL_Q_TQDR, TRCSTS) != 1) && + (XGMAC_GET_BITS(tx_status, MTL_Q_TQDR, TXQSTS) == 0)) + break; + + usleep_range(500, 1000); + } + + if (!time_before(jiffies, tx_timeout)) + netdev_info(pdata->netdev, + "timed out waiting for Tx queue %u to empty\n", + queue); +} + static void xgbe_prepare_tx_stop(struct xgbe_prv_data *pdata, - struct xgbe_channel *channel) + unsigned int queue) { unsigned int tx_dsr, tx_pos, tx_qidx; unsigned int tx_status; unsigned long tx_timeout; + if (XGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER) > 0x20) + return xgbe_txq_prepare_tx_stop(pdata, queue); + /* Calculate the status register to read and the position within */ - if (channel->queue_index < DMA_DSRX_FIRST_QUEUE) { + if (queue < DMA_DSRX_FIRST_QUEUE) { tx_dsr = DMA_DSR0; - tx_pos = (channel->queue_index * DMA_DSR_Q_WIDTH) + - DMA_DSR0_TPS_START; + tx_pos = (queue * DMA_DSR_Q_WIDTH) + DMA_DSR0_TPS_START; } else { - tx_qidx = channel->queue_index - DMA_DSRX_FIRST_QUEUE; + tx_qidx = queue - DMA_DSRX_FIRST_QUEUE; tx_dsr = DMA_DSR1 + ((tx_qidx / DMA_DSRX_QPR) * DMA_DSRX_INC); tx_pos = ((tx_qidx % DMA_DSRX_QPR) * DMA_DSR_Q_WIDTH) + @@ -2982,7 +3010,7 @@ static void xgbe_prepare_tx_stop(struct xgbe_prv_data *pdata, if (!time_before(jiffies, tx_timeout)) netdev_info(pdata->netdev, "timed out waiting for Tx DMA channel %u to stop\n", - channel->queue_index); + queue); } static void xgbe_enable_tx(struct xgbe_prv_data *pdata) @@ -3014,13 +3042,8 @@ static void xgbe_disable_tx(struct xgbe_prv_data *pdata) unsigned int i; /* Prepare for Tx DMA channel stop */ - channel = pdata->channel; - for (i = 0; i < pdata->channel_count; i++, channel++) { - if (!channel->tx_ring) - break; - - xgbe_prepare_tx_stop(pdata, channel); - } + for (i = 0; i < pdata->tx_q_count; i++) + xgbe_prepare_tx_stop(pdata, i); /* Disable MAC Tx */ XGMAC_IOWRITE_BITS(pdata, MAC_TCR, TE, 0); @@ -3144,13 +3167,8 @@ static void xgbe_powerdown_tx(struct xgbe_prv_data *pdata) unsigned int i; /* Prepare for Tx DMA channel stop */ - channel = pdata->channel; - for (i = 0; i < pdata->channel_count; i++, channel++) { - if (!channel->tx_ring) - break; - - xgbe_prepare_tx_stop(pdata, channel); - } + for (i = 0; i < pdata->tx_q_count; i++) + xgbe_prepare_tx_stop(pdata, i); /* Disable MAC Tx */ XGMAC_IOWRITE_BITS(pdata, MAC_TCR, TE, 0); diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h index 7cbf91b4aa79..d5cae1557908 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe.h +++ b/drivers/net/ethernet/amd/xgbe/xgbe.h @@ -159,7 +159,7 @@ #define XGBE_MAX_DMA_CHANNELS 16 #define XGBE_MAX_QUEUES 16 #define XGBE_PRIORITY_QUEUES 8 -#define XGBE_DMA_STOP_TIMEOUT 5 +#define XGBE_DMA_STOP_TIMEOUT 1 /* DMA cache settings - Outer sharable, write-back, write-allocate */ #define XGBE_DMA_OS_AXDOMAIN 0x2 -- 2.20.1