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Message-ID: <20090326081042.30689.93164.stgit@lost.foo-projects.org>
Date: Thu, 26 Mar 2009 01:10:42 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next PATCH] ixgbe: Allow Priority Flow Control settings to
survive a device reset
From: PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>
When changing DCB parameters, ixgbe needs to have the MAC reset. The way
the flow control code is setup today, PFC will be disabled on a reset.
This patch adds a new flow control type for PFC, and then has the netlink
layer take care of toggling which type of flow control to enable.
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ixgbe/ixgbe_common.c | 23 +++++++++++++++++++++--
drivers/net/ixgbe/ixgbe_dcb_82598.c | 1 -
drivers/net/ixgbe/ixgbe_dcb_82599.c | 3 ---
drivers/net/ixgbe/ixgbe_dcb_nl.c | 2 ++
drivers/net/ixgbe/ixgbe_type.h | 3 +++
5 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index 245db0e..8cfd3fd 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1654,9 +1654,10 @@ s32 ixgbe_fc_enable(struct ixgbe_hw *hw, s32 packetbuf_num)
* 0: Flow control is completely disabled
* 1: Rx flow control is enabled (we can receive pause frames,
* but not send pause frames).
- * 2: Tx flow control is enabled (we can send pause frames but
- * we do not support receiving pause frames).
+ * 2: Tx flow control is enabled (we can send pause frames but
+ * we do not support receiving pause frames).
* 3: Both Rx and Tx flow control (symmetric) are enabled.
+ * 4: Priority Flow Control is enabled.
* other: Invalid.
*/
switch (hw->fc.current_mode) {
@@ -1686,6 +1687,11 @@ s32 ixgbe_fc_enable(struct ixgbe_hw *hw, s32 packetbuf_num)
mflcn_reg |= IXGBE_MFLCN_RFCE;
fccfg_reg |= IXGBE_FCCFG_TFCE_802_3X;
break;
+#ifdef CONFIG_DCB
+ case ixgbe_fc_pfc:
+ goto out;
+ break;
+#endif
default:
hw_dbg(hw, "Flow control param set incorrectly\n");
ret_val = -IXGBE_ERR_CONFIG;
@@ -1746,6 +1752,7 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
* 2: Tx flow control is enabled (we can send pause frames but
* we do not support receiving pause frames).
* 3: Both Rx and Tx flow control (symmetric) are enabled.
+ * 4: Priority Flow Control is enabled.
* other: Invalid.
*/
switch (hw->fc.current_mode) {
@@ -1776,6 +1783,11 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
/* Flow control (both Rx and Tx) is enabled by SW override. */
reg |= (IXGBE_PCS1GANA_SYM_PAUSE | IXGBE_PCS1GANA_ASM_PAUSE);
break;
+#ifdef CONFIG_DCB
+ case ixgbe_fc_pfc:
+ goto out;
+ break;
+#endif
default:
hw_dbg(hw, "Flow control param set incorrectly\n");
ret_val = -IXGBE_ERR_CONFIG;
@@ -1874,6 +1886,13 @@ s32 ixgbe_setup_fc_generic(struct ixgbe_hw *hw, s32 packetbuf_num)
ixgbe_link_speed speed;
bool link_up;
+#ifdef CONFIG_DCB
+ if (hw->fc.requested_mode == ixgbe_fc_pfc) {
+ hw->fc.current_mode = hw->fc.requested_mode;
+ goto out;
+ }
+
+#endif
/* Validate the packetbuf configuration */
if (packetbuf_num < 0 || packetbuf_num > 7) {
hw_dbg(hw, "Invalid packet buffer number [%d], expected range "
diff --git a/drivers/net/ixgbe/ixgbe_dcb_82598.c b/drivers/net/ixgbe/ixgbe_dcb_82598.c
index df35955..6220627 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_82598.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_82598.c
@@ -298,7 +298,6 @@ s32 ixgbe_dcb_config_pfc_82598(struct ixgbe_hw *hw,
reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
reg &= ~IXGBE_RMCS_TFCE_802_3X;
/* correct the reporting of our flow control status */
- hw->fc.current_mode = ixgbe_fc_none;
reg |= IXGBE_RMCS_TFCE_PRIORITY;
IXGBE_WRITE_REG(hw, IXGBE_RMCS, reg);
diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c
index adcbac4..470b676 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_82599.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c
@@ -299,9 +299,6 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw,
goto out;
}
- /* PFC is mutually exclusive with link flow control */
- hw->fc.current_mode = ixgbe_fc_none;
-
/* Configure PFC Tx thresholds per TC */
for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
/* Config and remember Tx */
diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 8a9939e..0a8731f 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -130,6 +130,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
adapter->tx_ring = NULL;
adapter->rx_ring = NULL;
+ adapter->hw.fc.requested_mode = ixgbe_fc_pfc;
adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
adapter->flags |= IXGBE_FLAG_DCB_ENABLED;
ixgbe_init_interrupt_scheme(adapter);
@@ -138,6 +139,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
} else {
/* Turn off DCB */
if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+ adapter->hw.fc.requested_mode = ixgbe_fc_default;
if (netif_running(netdev))
netdev->netdev_ops->ndo_stop(netdev);
ixgbe_reset_interrupt_capability(adapter);
diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 95fc36c..2b2ecba 100644
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -1939,6 +1939,9 @@ enum ixgbe_fc_mode {
ixgbe_fc_rx_pause,
ixgbe_fc_tx_pause,
ixgbe_fc_full,
+#ifdef CONFIG_DCB
+ ixgbe_fc_pfc,
+#endif
ixgbe_fc_default
};
--
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