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| author | Lendacky, Thomas <Thomas.Lendacky@amd.com> | 2016-02-17 11:49:16 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-17 15:22:20 -0500 |
| commit | c3727d61ea73a1df60bacd0b416e01282a94240b (patch) | |
| tree | e8fcca84dce21e2e1be9df76cb12cb326067a1fa /drivers/net/ethernet/amd/xgbe/xgbe-dev.c | |
| parent | b3b715974bfe69f626d6a633b8c96590de1b7338 (diff) | |
| download | linux-c3727d61ea73a1df60bacd0b416e01282a94240b.tar.gz linux-c3727d61ea73a1df60bacd0b416e01282a94240b.tar.bz2 linux-c3727d61ea73a1df60bacd0b416e01282a94240b.zip | |
amd-xgbe: Check Rx queue fifos before stopping Rx DMA
Check to be sure that the Rx queue fifos are empty before stopping the
Rx DMA channels.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/amd/xgbe/xgbe-dev.c')
| -rw-r--r-- | drivers/net/ethernet/amd/xgbe/xgbe-dev.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c index 43273c9823aa..b48c6eca3e6b 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c @@ -2656,6 +2656,32 @@ static void xgbe_disable_tx(struct xgbe_prv_data *pdata) } } +static void xgbe_prepare_rx_stop(struct xgbe_prv_data *pdata, + unsigned int queue) +{ + unsigned int rx_status; + unsigned long rx_timeout; + + /* The Rx engine cannot be stopped if it is actively processing + * packets. Wait for the Rx queue to empty the Rx fifo. Don't + * wait forever though... + */ + rx_timeout = jiffies + (XGBE_DMA_STOP_TIMEOUT * HZ); + while (time_before(jiffies, rx_timeout)) { + rx_status = XGMAC_MTL_IOREAD(pdata, queue, MTL_Q_RQDR); + if ((XGMAC_GET_BITS(rx_status, MTL_Q_RQDR, PRXQ) == 0) && + (XGMAC_GET_BITS(rx_status, MTL_Q_RQDR, RXQSTS) == 0)) + break; + + usleep_range(500, 1000); + } + + if (!time_before(jiffies, rx_timeout)) + netdev_info(pdata->netdev, + "timed out waiting for Rx queue %u to empty\n", + queue); +} + static void xgbe_enable_rx(struct xgbe_prv_data *pdata) { struct xgbe_channel *channel; @@ -2694,6 +2720,10 @@ static void xgbe_disable_rx(struct xgbe_prv_data *pdata) XGMAC_IOWRITE_BITS(pdata, MAC_RCR, ACS, 0); XGMAC_IOWRITE_BITS(pdata, MAC_RCR, RE, 0); + /* Prepare for Rx DMA channel stop */ + for (i = 0; i < pdata->rx_q_count; i++) + xgbe_prepare_rx_stop(pdata, i); + /* Disable each Rx queue */ XGMAC_IOWRITE(pdata, MAC_RQC0R, 0); |