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authorGreg Edwards <gedwards@ddn.com>2017-06-28 09:22:26 -0600
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2017-08-08 17:52:45 -0700
commit46b3bb9b47ae63632892ad19976948b290aec2c6 (patch)
tree7caa76645a61ac0e449274318f733e9af84afb08 /drivers/net/ethernet/intel/igb/e1000_mbx.h
parentigb: expose mailbox unlock method (diff)
downloadlinux-dev-46b3bb9b47ae63632892ad19976948b290aec2c6.tar.xz
linux-dev-46b3bb9b47ae63632892ad19976948b290aec2c6.zip
igb: do not drop PF mailbox lock after read of VF message
When the PF receives a mailbox message from the VF, it grabs the mailbox lock, reads the VF message from the mailbox, ACKs the message and drops the lock. While the PF is performing the action for the VF message, nothing prevents another VF message from being posted to the mailbox. The current code handles this condition by just dropping any new VF messages without processing them. This results in a mailbox timeout in the VM for posted messages waiting for an ACK, and the VF is reset by the igbvf_watchdog_task in the VM. Given the right sequence of VF messages and mailbox timeouts, this condition can go on ad infinitum. Modify the PF mailbox read method to take an 'unlock' argument that optionally leaves the mailbox locked by the PF after reading the VF message. This ensures another VF message is not posted to the mailbox until after the PF has completed processing the VF message and written its reply. Signed-off-by: Greg Edwards <gedwards@ddn.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/igb/e1000_mbx.h')
-rw-r--r--drivers/net/ethernet/intel/igb/e1000_mbx.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/igb/e1000_mbx.h b/drivers/net/ethernet/intel/igb/e1000_mbx.h
index a98c5dc60afd..a62b08e1572e 100644
--- a/drivers/net/ethernet/intel/igb/e1000_mbx.h
+++ b/drivers/net/ethernet/intel/igb/e1000_mbx.h
@@ -67,7 +67,8 @@
#define E1000_PF_CONTROL_MSG 0x0100 /* PF control message */
-s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id);
+s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id,
+ bool unlock);
s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id);
s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id);
s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id);