linux-kernel - [PATCH 1/2] net/ibm/emac: add 8192 rx/tx fifo size

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Message-Id: <20180122160038.18965-1-ivan@de.ibm.com>
Date:   Mon, 22 Jan 2018 19:00:37 +0300
From:   Ivan Mikhaylov <ivan@...ibm.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Rob Herring <robh@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] net/ibm/emac: add 8192 rx/tx fifo size

emac4syn chips has availability to use 8192 rx/tx fifo buffer sizes,
in current state if we set it up in dts 8192 as example, we will get
only 2048 which may impact on network speed.

Signed-off-by: Ivan Mikhaylov <ivan@...ibm.com>
---
 drivers/net/ethernet/ibm/emac/core.c |    6 ++++++
 drivers/net/ethernet/ibm/emac/emac.h |    2 ++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index 7feff24..241db31 100644
--- a/drivers/net/ethernet/ibm/emac/core.c
+++ b/drivers/net/ethernet/ibm/emac/core.c
@@ -494,6 +494,9 @@ static u32 __emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_s
 	case 16384:
 		ret |= EMAC_MR1_RFS_16K;
 		break;
+	case 8192:
+		ret |= EMAC4_MR1_RFS_8K;
+		break;
 	case 4096:
 		ret |= EMAC_MR1_RFS_4K;
 		break;
@@ -516,6 +519,9 @@ static u32 __emac4_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_
 	case 16384:
 		ret |= EMAC4_MR1_TFS_16K;
 		break;
+	case 8192:
+		ret |= EMAC4_MR1_TFS_8K;
+		break;
 	case 4096:
 		ret |= EMAC4_MR1_TFS_4K;
 		break;
diff --git a/drivers/net/ethernet/ibm/emac/emac.h b/drivers/net/ethernet/ibm/emac/emac.h
index 5afcc27..d0a0e3b 100644
--- a/drivers/net/ethernet/ibm/emac/emac.h
+++ b/drivers/net/ethernet/ibm/emac/emac.h
@@ -151,9 +151,11 @@ struct emac_regs {
 
 #define EMAC4_MR1_RFS_2K		0x00100000
 #define EMAC4_MR1_RFS_4K		0x00180000
+#define EMAC4_MR1_RFS_8K		0x00200000
 #define EMAC4_MR1_RFS_16K		0x00280000
 #define EMAC4_MR1_TFS_2K       		0x00020000
 #define EMAC4_MR1_TFS_4K		0x00030000
+#define EMAC4_MR1_TFS_8K		0x00040000
 #define EMAC4_MR1_TFS_16K		0x00050000
 #define EMAC4_MR1_TR			0x00008000
 #define EMAC4_MR1_MWSW_001		0x00001000
-- 
1.7.1