d/numam-dpdk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

net/e1000/base: retry to get HW mailbox lock

Browse Source 
The driver shouldn't give up if it fails to get the hardware mailbox lock.

This can happen in a situation where the PF-VF communication channel is
heavily loaded and causes complete communications failure between the PF
and VF drivers.

Add a counter and a delay. The driver will now retry ten times,
waiting one millisecond between retries.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
This commit is contained in:
Wenzhuo Lu 2016-11-23 12:22:47 -05:00 committed by Ferruh Yigit
parent 8cce758d69
commit bc043fb7c9
1 changed files with 25 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/net/e1000/base/e1000_mbx.c
View File

@ -430,15 +430,21 @@ STATIC s32 e1000_check_for_rst_vf(struct e1000_hw *hw,
STATIC s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
{
s32 ret_val = -E1000_ERR_MBX;
int count = 10;
DEBUGFUNC("e1000_obtain_mbx_lock_vf");
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
do {
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
/* reserve mailbox for vf use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU)
ret_val = E1000_SUCCESS;
/* reserve mailbox for vf use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) {
ret_val = E1000_SUCCESS;
break;
}
usec_delay(1000);
} while (count-- > 0);
return ret_val;
}
@ -645,18 +651,26 @@ STATIC s32 e1000_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
{
s32 ret_val = -E1000_ERR_MBX;
u32 p2v_mailbox;
int count = 10;
DEBUGFUNC("e1000_obtain_mbx_lock_pf");
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
do {
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number),
E1000_P2VMAILBOX_PFU);
/* reserve mailbox for vf use */
p2v_mailbox = E1000_READ_REG(hw, E1000_P2VMAILBOX(vf_number));
if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
ret_val = E1000_SUCCESS;
/* reserve mailbox for pf use */
p2v_mailbox = E1000_READ_REG(hw, E1000_P2VMAILBOX(vf_number));
if (p2v_mailbox & E1000_P2VMAILBOX_PFU) {
ret_val = E1000_SUCCESS;
break;
}
usec_delay(1000);
} while (count-- > 0);
return ret_val;
}
/**