From: Wenzhuo Lu <wenzhuo.lu@intel.com>
Date: Fri, 16 Oct 2015 02:50:50 +0000 (+0800)
Subject: e1000/base: fix jumbo frame CRC failures
X-Git-Tag: spdx-start~8338
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=f26b9791667a7cce9cddf8a0bb26d5788d7c5f0a;p=dpdk.git

e1000/base: fix jumbo frame CRC failures

This is a patch to change the value of register 776.20[11:2] for jumbo
mode from 0x1A to 0x1F. This is to enlarge the gap between read and
write pointers in the TX Fifo.
And replace the magic number with a macro by the way.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
---

diff --git a/drivers/net/e1000/base/e1000_defines.h b/drivers/net/e1000/base/e1000_defines.h
index 71bd2e0da4..79a88bb2ca 100644
--- a/drivers/net/e1000/base/e1000_defines.h
+++ b/drivers/net/e1000/base/e1000_defines.h
@@ -468,6 +468,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #define ETHERNET_FCS_SIZE		4
 #define MAX_JUMBO_FRAME_SIZE		0x3F00
+#define E1000_TX_PTR_GAP		0x1F
 
 /* Extended Configuration Control and Size */
 #define E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP	0x00000020
diff --git a/drivers/net/e1000/base/e1000_ich8lan.c b/drivers/net/e1000/base/e1000_ich8lan.c
index a11e0857aa..103b41a0a1 100644
--- a/drivers/net/e1000/base/e1000_ich8lan.c
+++ b/drivers/net/e1000/base/e1000_ich8lan.c
@@ -2604,7 +2604,7 @@ s32 e1000_lv_jumbo_workaround_ich8lan(struct e1000_hw *hw, bool enable)
 			return ret_val;
 		hw->phy.ops.read_reg(hw, PHY_REG(776, 20), &data);
 		data &= ~(0x3FF << 2);
-		data |= (0x1A << 2);
+		data |= (E1000_TX_PTR_GAP << 2);
 		ret_val = hw->phy.ops.write_reg(hw, PHY_REG(776, 20), data);
 		if (ret_val)
 			return ret_val;