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Date:   Mon, 29 Apr 2019 10:05:07 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     "David S . Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nikita Danilov <Nikita.Danilov@...antia.com>,
        Dmitry Bogdanov <Dmitry.Bogdanov@...antia.com>,
        Igor Russkikh <Igor.Russkikh@...antia.com>
Subject: [PATCH v4 net-next 14/15] net: aquantia: fixups on 64bit dma counters

From: Dmitry Bogdanov <dmitry.bogdanov@...antia.com>

DMA counters are 64 bit and we can fetch that to reduce
counter overflow, espesially on byte counters.

Tested-by: Nikita Danilov <ndanilov@...antia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@...antia.com>
---
 .../ethernet/aquantia/atlantic/aq_hw_utils.c  | 12 ++++++
 .../ethernet/aquantia/atlantic/aq_hw_utils.h  |  1 +
 .../aquantia/atlantic/hw_atl/hw_atl_llh.c     | 41 ++++---------------
 .../aquantia/atlantic/hw_atl/hw_atl_llh.h     | 31 ++++----------
 .../atlantic/hw_atl/hw_atl_llh_internal.h     |  3 --
 .../aquantia/atlantic/hw_atl/hw_atl_utils.c   | 12 +++---
 6 files changed, 36 insertions(+), 64 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c
index d526c4f19d34..22a1c784dc9c 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c
@@ -53,6 +53,18 @@ void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
 	writel(value, hw->mmio + reg);
 }
 
+/* Most of 64-bit registers are in LSW, MSW form.
+   Counters are normally implemented by HW as latched pairs:
+   reading LSW first locks MSW, to overcome LSW overflow
+ */
+u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg)
+{
+	u64 value = aq_hw_read_reg(hw, reg);
+
+	value |= (u64)aq_hw_read_reg(hw, reg + 4) << 32;
+	return value;
+}
+
 int aq_hw_err_from_flags(struct aq_hw_s *hw)
 {
 	int err = 0;
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.h b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.h
index bc711238ca0c..bf73428ed689 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.h
@@ -35,6 +35,7 @@ void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
 u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift);
 u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg);
 void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value);
+u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg);
 int aq_hw_err_from_flags(struct aq_hw_s *hw);
 
 #endif /* AQ_HW_UTILS_H */
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.c
index 9442deff98a8..eaab25cd08b3 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.c
@@ -49,11 +49,6 @@ u32 hw_atl_glb_soft_res_get(struct aq_hw_s *aq_hw)
 				  HW_ATL_GLB_SOFT_RES_SHIFT);
 }
 
-u32 hw_atl_reg_rx_dma_stat_counter7get(struct aq_hw_s *aq_hw)
-{
-	return aq_hw_read_reg(aq_hw, HW_ATL_RX_DMA_STAT_COUNTER7_ADR);
-}
-
 u32 hw_atl_reg_glb_mif_id_get(struct aq_hw_s *aq_hw)
 {
 	return aq_hw_read_reg(aq_hw, HW_ATL_GLB_MIF_ID_ADR);
@@ -65,44 +60,24 @@ u32 hw_atl_rpb_rx_dma_drop_pkt_cnt_get(struct aq_hw_s *aq_hw)
 	return aq_hw_read_reg(aq_hw, HW_ATL_RPB_RX_DMA_DROP_PKT_CNT_ADR);
 }
 
-u32 hw_atl_stats_rx_dma_good_octet_counterlsw_get(struct aq_hw_s *aq_hw)
-{
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_OCTET_COUNTERLSW);
-}
-
-u32 hw_atl_stats_rx_dma_good_pkt_counterlsw_get(struct aq_hw_s *aq_hw)
-{
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_PKT_COUNTERLSW);
-}
-
-u32 hw_atl_stats_tx_dma_good_octet_counterlsw_get(struct aq_hw_s *aq_hw)
-{
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_OCTET_COUNTERLSW);
-}
-
-u32 hw_atl_stats_tx_dma_good_pkt_counterlsw_get(struct aq_hw_s *aq_hw)
-{
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_PKT_COUNTERLSW);
-}
-
-u32 hw_atl_stats_rx_dma_good_octet_countermsw_get(struct aq_hw_s *aq_hw)
+u64 hw_atl_stats_rx_dma_good_octet_counter_get(struct aq_hw_s *aq_hw)
 {
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_OCTET_COUNTERMSW);
+	return aq_hw_read_reg64(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_OCTET_COUNTERLSW);
 }
 
-u32 hw_atl_stats_rx_dma_good_pkt_countermsw_get(struct aq_hw_s *aq_hw)
+u64 hw_atl_stats_rx_dma_good_pkt_counter_get(struct aq_hw_s *aq_hw)
 {
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_PKT_COUNTERMSW);
+	return aq_hw_read_reg64(aq_hw, HW_ATL_STATS_RX_DMA_GOOD_PKT_COUNTERLSW);
 }
 
-u32 hw_atl_stats_tx_dma_good_octet_countermsw_get(struct aq_hw_s *aq_hw)
+u64 hw_atl_stats_tx_dma_good_octet_counter_get(struct aq_hw_s *aq_hw)
 {
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_OCTET_COUNTERMSW);
+	return aq_hw_read_reg64(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_OCTET_COUNTERLSW);
 }
 
-u32 hw_atl_stats_tx_dma_good_pkt_countermsw_get(struct aq_hw_s *aq_hw)
+u64 hw_atl_stats_tx_dma_good_pkt_counter_get(struct aq_hw_s *aq_hw)
 {
-	return aq_hw_read_reg(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_PKT_COUNTERMSW);
+	return aq_hw_read_reg64(aq_hw, HW_ATL_STATS_TX_DMA_GOOD_PKT_COUNTERLSW);
 }
 
 /* interrupt */
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.h b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.h
index 4cfa4bd80ad3..2eb44e1cff70 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.h
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.h
@@ -40,29 +40,17 @@ u32 hw_atl_glb_soft_res_get(struct aq_hw_s *aq_hw);
 
 u32 hw_atl_rpb_rx_dma_drop_pkt_cnt_get(struct aq_hw_s *aq_hw);
 
-/* get rx dma good octet counter lsw */
-u32 hw_atl_stats_rx_dma_good_octet_counterlsw_get(struct aq_hw_s *aq_hw);
+/* get rx dma good octet counter */
+u64 hw_atl_stats_rx_dma_good_octet_counter_get(struct aq_hw_s *aq_hw);
 
-/* get rx dma good packet counter lsw */
-u32 hw_atl_stats_rx_dma_good_pkt_counterlsw_get(struct aq_hw_s *aq_hw);
+/* get rx dma good packet counter */
+u64 hw_atl_stats_rx_dma_good_pkt_counter_get(struct aq_hw_s *aq_hw);
 
-/* get tx dma good octet counter lsw */
-u32 hw_atl_stats_tx_dma_good_octet_counterlsw_get(struct aq_hw_s *aq_hw);
+/* get tx dma good octet counter */
+u64 hw_atl_stats_tx_dma_good_octet_counter_get(struct aq_hw_s *aq_hw);
 
-/* get tx dma good packet counter lsw */
-u32 hw_atl_stats_tx_dma_good_pkt_counterlsw_get(struct aq_hw_s *aq_hw);
-
-/* get rx dma good octet counter msw */
-u32 hw_atl_stats_rx_dma_good_octet_countermsw_get(struct aq_hw_s *aq_hw);
-
-/* get rx dma good packet counter msw */
-u32 hw_atl_stats_rx_dma_good_pkt_countermsw_get(struct aq_hw_s *aq_hw);
-
-/* get tx dma good octet counter msw */
-u32 hw_atl_stats_tx_dma_good_octet_countermsw_get(struct aq_hw_s *aq_hw);
-
-/* get tx dma good packet counter msw */
-u32 hw_atl_stats_tx_dma_good_pkt_countermsw_get(struct aq_hw_s *aq_hw);
+/* get tx dma good packet counter */
+u64 hw_atl_stats_tx_dma_good_pkt_counter_get(struct aq_hw_s *aq_hw);
 
 /* get msm rx errors counter register */
 u32 hw_atl_reg_mac_msm_rx_errs_cnt_get(struct aq_hw_s *aq_hw);
@@ -82,9 +70,6 @@ u32 hw_atl_reg_mac_msm_rx_bcst_octets_counter1get(struct aq_hw_s *aq_hw);
 /* get msm rx unicast octets counter register 0 */
 u32 hw_atl_reg_mac_msm_rx_ucst_octets_counter0get(struct aq_hw_s *aq_hw);
 
-/* get rx dma statistics counter 7 */
-u32 hw_atl_reg_rx_dma_stat_counter7get(struct aq_hw_s *aq_hw);
-
 /* get msm tx errors counter register */
 u32 hw_atl_reg_mac_msm_tx_errs_cnt_get(struct aq_hw_s *aq_hw);
 
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh_internal.h b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh_internal.h
index 430bbd45b2f0..b64140924a02 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh_internal.h
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh_internal.h
@@ -58,9 +58,6 @@
 /* preprocessor definitions for msm rx unicast octets counter register 0 */
 #define HW_ATL_MAC_MSM_RX_UCST_OCTETS_COUNTER0_ADR 0x000001b8u
 
-/* preprocessor definitions for rx dma statistics counter 7 */
-#define HW_ATL_RX_DMA_STAT_COUNTER7_ADR 0x00006818u
-
 /* preprocessor definitions for msm tx unicast frames counter register */
 #define HW_ATL_MAC_MSM_TX_UCST_FRM_CNT_ADR 0x00000108u
 
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
index b521457434fc..1208f7ecdd76 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
@@ -545,7 +545,7 @@ void hw_atl_utils_mpi_read_stats(struct aq_hw_s *self,
 		pmbox->stats.ubtc = pmbox->stats.uptc * mtu;
 		pmbox->stats.dpc = atomic_read(&self->dpc);
 	} else {
-		pmbox->stats.dpc = hw_atl_reg_rx_dma_stat_counter7get(self);
+		pmbox->stats.dpc = hw_atl_rpb_rx_dma_drop_pkt_cnt_get(self);
 	}
 
 err_exit:;
@@ -763,6 +763,7 @@ static int hw_atl_fw1x_deinit(struct aq_hw_s *self)
 int hw_atl_utils_update_stats(struct aq_hw_s *self)
 {
 	struct hw_atl_utils_mbox mbox;
+	struct aq_stats_s *cs = &self->curr_stats;
 
 	hw_atl_utils_mpi_read_stats(self, &mbox);
 
@@ -789,10 +790,11 @@ int hw_atl_utils_update_stats(struct aq_hw_s *self)
 		AQ_SDELTA(dpc);
 	}
 #undef AQ_SDELTA
-	self->curr_stats.dma_pkt_rc = hw_atl_stats_rx_dma_good_pkt_counterlsw_get(self);
-	self->curr_stats.dma_pkt_tc = hw_atl_stats_tx_dma_good_pkt_counterlsw_get(self);
-	self->curr_stats.dma_oct_rc = hw_atl_stats_rx_dma_good_octet_counterlsw_get(self);
-	self->curr_stats.dma_oct_tc = hw_atl_stats_tx_dma_good_octet_counterlsw_get(self);
+
+	cs->dma_pkt_rc = hw_atl_stats_rx_dma_good_pkt_counter_get(self);
+	cs->dma_pkt_tc = hw_atl_stats_tx_dma_good_pkt_counter_get(self);
+	cs->dma_oct_rc = hw_atl_stats_rx_dma_good_octet_counter_get(self);
+	cs->dma_oct_tc = hw_atl_stats_tx_dma_good_octet_counter_get(self);
 
 	memcpy(&self->last_stats, &mbox.stats, sizeof(mbox.stats));
 
-- 
2.17.1

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