[PATCH net-next v1] amd-xgbe: Interrupt summary bits are h/w version dependent

[PATCH net-next v1] amd-xgbe: Interrupt summary bits are h/w version dependent

[Tom Lendacky]

There is a difference in the bit position of the normal interrupt summary
enable (NIE) and abnormal interrupt summary enable (AIE) between revisions
of the hardware.  For older revisions the NIE and AIE bits are positions
16 and 15 respectively.  For newer revisions the NIE and AIE bits are
positions 15 and 14.  The effect in changing the bit position is that
newer hardware won't receive AIE interrupts in the current version of the
driver.  Specifically, the driver uses this interrupt to collect
statistics on when a receive buffer unavailable event occurs and to
restart the driver/device when a fatal bus error occurs.

Update the driver to set the interrupt enable bit based on the reported
version of the hardware.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-common.h |    8 ++++++--
 drivers/net/ethernet/amd/xgbe/xgbe-dev.c    |   13 ++++++++++---
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-common.h b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
index 9431330..7ea72ef 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-common.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
@@ -210,11 +210,15 @@
 #define DMA_CH_CR_PBLX8_WIDTH		1
 #define DMA_CH_CR_SPH_INDEX		24
 #define DMA_CH_CR_SPH_WIDTH		1
-#define DMA_CH_IER_AIE_INDEX		15
+#define DMA_CH_IER_AIE20_INDEX		15
+#define DMA_CH_IER_AIE20_WIDTH		1
+#define DMA_CH_IER_AIE_INDEX		14
 #define DMA_CH_IER_AIE_WIDTH		1
 #define DMA_CH_IER_FBEE_INDEX		12
 #define DMA_CH_IER_FBEE_WIDTH		1
-#define DMA_CH_IER_NIE_INDEX		16
+#define DMA_CH_IER_NIE20_INDEX		16
+#define DMA_CH_IER_NIE20_WIDTH		1
+#define DMA_CH_IER_NIE_INDEX		15
 #define DMA_CH_IER_NIE_WIDTH		1
 #define DMA_CH_IER_RBUE_INDEX		7
 #define DMA_CH_IER_RBUE_WIDTH		1
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index 671203d..e107e18 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -649,13 +649,15 @@ static void xgbe_config_flow_control(struct xgbe_prv_data *pdata)
 static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
 {
 	struct xgbe_channel *channel;
-	unsigned int i;
+	unsigned int i, ver;
 
 	/* Set the interrupt mode if supported */
 	if (pdata->channel_irq_mode)
 		XGMAC_IOWRITE_BITS(pdata, DMA_MR, INTM,
 				   pdata->channel_irq_mode);
 
+	ver = XGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER);
+
 	for (i = 0; i < pdata->channel_count; i++) {
 		channel = pdata->channel[i];
 
@@ -671,8 +673,13 @@ static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
 		 *   AIE  - Abnormal Interrupt Summary Enable
 		 *   FBEE - Fatal Bus Error Enable
 		 */
-		XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, NIE, 1);
-		XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, AIE, 1);
+		if (ver < 0x21) {
+			XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, NIE20, 1);
+			XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, AIE20, 1);
+		} else {
+			XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, NIE, 1);
+			XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, AIE, 1);
+		}
 		XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, FBEE, 1);
 
 		if (channel->tx_ring) {

Re: [PATCH net-next v1] amd-xgbe: Interrupt summary bits are h/w version dependent

[David Miller]

From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Mon, 28 Aug 2017 15:29:34 -0500

> There is a difference in the bit position of the normal interrupt summary
> enable (NIE) and abnormal interrupt summary enable (AIE) between revisions
> of the hardware.  For older revisions the NIE and AIE bits are positions
> 16 and 15 respectively.  For newer revisions the NIE and AIE bits are
> positions 15 and 14.  The effect in changing the bit position is that
> newer hardware won't receive AIE interrupts in the current version of the
> driver.  Specifically, the driver uses this interrupt to collect
> statistics on when a receive buffer unavailable event occurs and to
> restart the driver/device when a fatal bus error occurs.
> 
> Update the driver to set the interrupt enable bit based on the reported
> version of the hardware.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>

Applied.