diff mbox

[net-next,17/18] fm10k: Only trigger data path reset if fabric is up

Message ID 1442363803-47237-18-git-send-email-jeffrey.t.kirsher@intel.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T Sept. 16, 2015, 12:36 a.m. UTC 
From: Alexander Duyck <alexander.duyck@redhat.com>

This change makes it so that we only trigger the data path reset if the
fabric is ready to handle traffic.  The general idea is to avoid
triggering the reset unless the switch API is ready for us.  Otherwise
we can just postpone the reset until we receive a switch ready
notification.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/fm10k/fm10k_pf.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pf.c b/drivers/net/ethernet/intel/fm10k/fm10k_pf.c
index 241b969..d806d87 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pf.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pf.c
@@ -59,6 +59,11 @@  static s32 fm10k_reset_hw_pf(struct fm10k_hw *hw)
 	if (reg & (FM10K_DMA_CTRL_TX_ACTIVE | FM10K_DMA_CTRL_RX_ACTIVE))
 		return FM10K_ERR_DMA_PENDING;
 
+	/* verify the switch is ready for reset */
+	reg = fm10k_read_reg(hw, FM10K_DMA_CTRL2);
+	if (!(reg & FM10K_DMA_CTRL2_SWITCH_READY))
+		goto out;
+
 	/* Inititate data path reset */
 	reg |= FM10K_DMA_CTRL_DATAPATH_RESET;
 	fm10k_write_reg(hw, FM10K_DMA_CTRL, reg);
@@ -72,6 +77,7 @@  static s32 fm10k_reset_hw_pf(struct fm10k_hw *hw)
 	if (!(reg & FM10K_IP_NOTINRESET))
 		err = FM10K_ERR_RESET_FAILED;
 
+out:
 	return err;
 }