[NET-NEXT PATCH 06/18] igb: fix init on 82575 with MNG enabled

Jeff Kirsher
2008-06-27T18:02:38Z

From: Alexander Duyck <alexander.h.duyck@intel.com>

This patch resolves an issue seen on 82575 adapters with managability
pass-thru enabled, which could cause the system to panic.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

drivers/net/igb/e1000_82575.c | 73 +++++++++++++++++++++++++++++++++++++++
drivers/net/igb/e1000_82575.h | 2 +
drivers/net/igb/e1000_defines.h | 1 +
drivers/net/igb/igb_main.c | 3 ++
4 files changed, 79 insertions(+), 0 deletions(-)

diff --git a/drivers/net/igb/e1000_82575.c b/drivers/net/igb/e1000_82575.c
index 84ef695..2c8b910 100644
--- a/drivers/net/igb/e1000_82575.c
+++ b/drivers/net/igb/e1000_82575.c
@@ -1227,6 +1227,79 @@ static void igb_clear_hw_cntrs_82575(struct e1000_hw *hw)
temp = rd32(E1000_SCVPC);
}

+/**
+ * igb_rx_fifo_flush_82575 - Clean rx fifo after RX enable
+ * @hw: pointer to the HW structure
+ *
+ * After rx enable if managability is enabled then there is likely some
+ * bad data at the start of the fifo and possibly in the DMA fifo. This
+ * function clears the fifos and flushes any packets that came in as rx was
+ * being enabled.
+ **/
+void igb_rx_fifo_flush_82575(struct e1000_hw *hw)
+{
+ u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
+ int i, ms_wait;
+
+ if (hw->mac.type != e1000_82575 ||
+ !(rd32(E1000_MANC) & E1000_MANC_RCV_TCO_EN))
+ return;
+
+ /* Disable all RX queues */
+ for (i = 0; i < 4; i++) {
+ rxdctl[i] = rd32(E1000_RXDCTL(i));
+ wr32(E1000_RXDCTL(i),
+ rxdctl[i] & ~E1000_RXDCTL_QUEUE_ENABLE);
+ }
+ /* Poll all queues to verify they have shut down */
+ for (ms_wait = 0; ms_wait < 10; ms_wait++) {
+ msleep(1);
+ rx_enabled = 0;
+ for (i = 0; i < 4; i++)
+ rx_enabled |= rd32(E1000_RXDCTL(i));
+ if (!(rx_enabled & E1000_RXDCTL_QUEUE_ENABLE))
+ break;
+ }
+
+ if (ms_wait == 10)
+ hw_dbg("Queue disable timed out after 10ms\n");
+
+ /* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
+ * incoming packets are rejected. Set enable and wait 2ms so that
+ * any packet that was coming in as RCTL.EN was set is flushed
+ */
+ rfctl = rd32(E1000_RFCTL);
+ wr32(E1000_RFCTL, rfctl & ~E1000_RFCTL_LEF);
+
+ rlpml = rd32(E1000_RLPML);
+ wr32(E1000_RLPML, 0);
+
+ rctl = rd32(E1000_RCTL);
+ temp_rctl = rctl & ~(E1000_RCTL_EN | E1000_RCTL_SBP);
+ temp_rctl |= E1000_RCTL_LPE;
+
+ wr32(E1000_RCTL, temp_rctl);
+ wr32(E1000_RCTL, temp_rctl | E1000_RCTL_EN);
+ wrfl();
+ msleep(2);
+
+ /* Enable RX queues that were previously enabled and restore our
+ * previous state
+ */
+ for (i = 0; i < 4; i++)
+ wr32(E1000_RXDCTL(i), rxdctl[i]);
+ wr32(E1000_RCTL, rctl);
+ wrfl();
+
+ wr32(E1000_RLPML, rlpml);
+ wr32(E1000_RFCTL, rfctl);
+
+ /* Flush receive errors generated by workaround */
+ rd32(E1000_ROC);
+ rd32(E1000_RNBC);
+ rd32(E1000_MPC);
+}
+
static struct e1000_mac_operations e1000_mac_ops_82575 = {
.reset_hw = igb_reset_hw_82575,
.init_hw = igb_init_hw_82575,
diff --git a/drivers/net/igb/e1000_82575.h b/drivers/net/igb/e1000_82575.h
index 5fb79dd..d78ad33 100644
--- a/drivers/net/igb/e1000_82575.h
+++ b/drivers/net/igb/e1000_82575.h
@@ -28,6 +28,8 @@
#ifndef _E1000_82575_H_
#define _E1000_82575_H_

+extern void igb_rx_fifo_flush_82575(struct e1000_hw *hw);
+
#define E1000_RAR_ENTRIES_82575 16

/* SRRCTL bit definitions */
diff --git a/drivers/net/igb/e1000_defines.h b/drivers/net/igb/e1000_defines.h
index 1006d53..ed748dc 100644
--- a/drivers/net/igb/e1000_defines.h
+++ b/drivers/net/igb/e1000_defines.h
@@ -340,6 +340,7 @@
#define E1000_RXCSUM_PCSD 0x00002000 /* packet checksum disabled */

/* Header split receive */
+#define E1000_RFCTL_LEF 0x00040000

/* Collision related configuration parameters */
#define E1000_COLLISION_THRESHOLD 15
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index bf083e3..a43186e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -630,6 +630,9 @@ static void igb_configure(struct igb_adapter *adapter)
igb_configure_tx(adapter);
igb_setup_rctl(adapter);
igb_configure_rx(adapter);
+
+ igb_rx_fifo_flush_82575(&adapter->hw);
+
/* call IGB_DESC_UNUSED which always leaves
* at least 1 descriptor unused to make sure
* next_to_use != next_to_clean */