From: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Date: Fri, 16 Nov 2018 16:19:23 -0800
Subject: igb: Change RXPBSIZE size when setting Qav mode
Patch-mainline: v5.0-rc1
Git-commit: 6f9ae17530f996e90268dae5ee843e432e40ccb3
References: bsc#1117495
Section 4.5.9 of the datasheet says that the total size of all packet
buffers combined (TxPB 0 + 1 + 2 + 3 + RxPB + BMC2OS + OS2BMC) must not
exceed 60KB. Today we are configuring a total of 62KB, so reduce the
RxPB from 32KB to 30KB in order to respect that.
The choice of changing RxPBSIZE here is mainly because it seems more
correct to give more priority to the transmit packet buffers over the
receiver ones when running in Qav mode. Also, the BMC2OS and OS2BMC
sizes are already too short.
Signed-off-by: Jesus Sanchez-Palencia <jesus.s.palencia@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/intel/igb/e1000_defines.h
+++ b/drivers/net/ethernet/intel/igb/e1000_defines.h
@@ -354,6 +354,7 @@
#define I210_RXPBSIZE_DEFAULT 0x000000A2 /* RXPBSIZE default */
#define I210_RXPBSIZE_MASK 0x0000003F
+#define I210_RXPBSIZE_PB_30KB 0x0000001E
#define I210_RXPBSIZE_PB_32KB 0x00000020
#define I210_TXPBSIZE_DEFAULT 0x04000014 /* TXPBSIZE default */
#define I210_TXPBSIZE_MASK 0xC0FFFFFF
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1889,7 +1889,7 @@ static void igb_setup_tx_mode(struct igb
val = rd32(E1000_RXPBS);
val &= ~I210_RXPBSIZE_MASK;
- val |= I210_RXPBSIZE_PB_32KB;
+ val |= I210_RXPBSIZE_PB_30KB;
wr32(E1000_RXPBS, val);
/* Section 8.12.9 states that MAX_TPKT_SIZE from DTXMXPKTSZ