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igb/igbvf: don't give up

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The driver shouldn't just 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: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2015-12-11 16:45:38 -08:00 committed by Jeff Kirsher
parent 37a5d163fb
commit 9ce0e8d726
2 changed files with 23 additions and 11 deletions
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18
drivers/net/ethernet/intel/igb/e1000_mbx.c
View File

@ -322,14 +322,20 @@ static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
{
s32 ret_val = -E1000_ERR_MBX;
u32 p2v_mailbox;
int count = 10;
/* Take ownership of the buffer */
wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
do {
/* Take ownership of the buffer */
wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
/* reserve mailbox for vf use */
p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
ret_val = 0;
/* reserve mailbox for vf use */
p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
if (p2v_mailbox & E1000_P2VMAILBOX_PFU) {
ret_val = 0;
break;
}
udelay(1000);
} while (count-- > 0);
return ret_val;
}

16
drivers/net/ethernet/intel/igbvf/mbx.c
View File

@ -234,13 +234,19 @@ 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;
/* Take ownership of the buffer */
ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
do {
/* Take ownership of the buffer */
ew32(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 = 0;
break;
}
udelay(1000);
} while (count-- > 0);
return ret_val;
}