Make sure req_q_phy_addr write to the register.
Signed-off-by: Joe Jin <[email protected]>
Cc: Ron Mercer <[email protected]>
Cc: Jitendra Kalsaria <[email protected]>
---
drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index df09b1c..78b4cba 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -2525,6 +2525,12 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
qdev->req_q_size =
(u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
+ /*
+ * The barrier is required to ensure that req_q_phy_addr writes to
+ * the memory.
+ */
+ wmb();
+
qdev->req_q_virt_addr =
pci_alloc_consistent(qdev->pdev,
(size_t) qdev->req_q_size,
--
1.7.11.7
>-----Original Message-----
>From: Joe Jin [mailto:[email protected]]
>Sent: Tuesday, October 16, 2012 11:32 PM
>To: Ron Mercer; Jitendra Kalsaria; Dept-Eng Linux Driver
>Cc: netdev; linux-kernel; Greg Marsden
>Subject: [PATCH] qla3xxx: Ensure req_q_phy_addr writes to the register
>
>Make sure req_q_phy_addr write to the register.
>
>Signed-off-by: Joe Jin <[email protected]>
>Cc: Ron Mercer <[email protected]>
>Cc: Jitendra Kalsaria <[email protected]>
>---
> drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
>diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
>index df09b1c..78b4cba 100644
>--- a/drivers/net/ethernet/qlogic/qla3xxx.c
>+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
>@@ -2525,6 +2525,12 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
> qdev->req_q_size =
> (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
>
>+ /*
>+ * The barrier is required to ensure that req_q_phy_addr writes to
>+ * the memory.
>+ */
>+ wmb();
>+
> qdev->req_q_virt_addr =
> pci_alloc_consistent(qdev->pdev,
> (size_t) qdev->req_q_size,
Your changes only take care of request queue but not response queue which also need barrier.
qdev->req_q_size =
(u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
qdev->rsp_q_size = NUM_RSP_Q_ENTRIES * sizeof(struct net_rsp_iocb);
wmb();
thanks,
Jiten
--
1.7.11.7
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On 10/18/12 01:45, Jitendra Kalsaria wrote:
>
>
>> -----Original Message-----
>> From: Joe Jin [mailto:[email protected]]
>> Sent: Tuesday, October 16, 2012 11:32 PM
>> To: Ron Mercer; Jitendra Kalsaria; Dept-Eng Linux Driver
>> Cc: netdev; linux-kernel; Greg Marsden
>> Subject: [PATCH] qla3xxx: Ensure req_q_phy_addr writes to the register
>>
>> Make sure req_q_phy_addr write to the register.
>>
>> Signed-off-by: Joe Jin <[email protected]>
>> Cc: Ron Mercer <[email protected]>
>> Cc: Jitendra Kalsaria <[email protected]>
>> ---
>> drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
>> index df09b1c..78b4cba 100644
>> --- a/drivers/net/ethernet/qlogic/qla3xxx.c
>> +++ b/drivers/net/ethernet/qlogic/qla3xxx.c
>> @@ -2525,6 +2525,12 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
>> qdev->req_q_size =
>> (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
>>
>> + /*
>> + * The barrier is required to ensure that req_q_phy_addr writes to
>> + * the memory.
>> + */
>> + wmb();
>> +
>> qdev->req_q_virt_addr =
>> pci_alloc_consistent(qdev->pdev,
>> (size_t) qdev->req_q_size,
>
> Your changes only take care of request queue but not response queue which also need barrier.
Jiten,
Thanks for review!
The barrier to make sure writel() call for req_q_phy_addr and rsp_q_phy_addr in
ql_adapter_initialize(), so I think call once wmb() is enough but I need to update
the comment, any idea?
Thanks,
Joe
>
> qdev->req_q_size =
> (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
>
> qdev->rsp_q_size = NUM_RSP_Q_ENTRIES * sizeof(struct net_rsp_iocb);
>
> wmb();
>
> thanks,
> Jiten
>
--
Oracle <http://www.oracle.com>
Joe Jin | Software Development Senior Manager | +8610.6106.5624
ORACLE | Linux and Virtualization
No. 24 Zhongguancun Software Park, Haidian District | 100193 Beijing
>>> -----Original Message-----
>>> From: Joe Jin [mailto:[email protected]]
>>> Sent: Tuesday, October 16, 2012 11:32 PM
>>> To: Ron Mercer; Jitendra Kalsaria; Dept-Eng Linux Driver
>>> Cc: netdev; linux-kernel; Greg Marsden
>>> Subject: [PATCH] qla3xxx: Ensure req_q_phy_addr writes to the register
>>>
>>> Make sure req_q_phy_addr write to the register.
>>>
>>> Signed-off-by: Joe Jin <[email protected]>
>>> Cc: Ron Mercer <[email protected]>
>>> Cc: Jitendra Kalsaria <[email protected]>
>>> ---
>>> drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
>>> 1 file changed, 6 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
>>> index df09b1c..78b4cba 100644
>>> --- a/drivers/net/ethernet/qlogic/qla3xxx.c
>>> +++ b/drivers/net/ethernet/qlogic/qla3xxx.c
>>> @@ -2525,6 +2525,12 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
>>> qdev->req_q_size =
>>> (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
>>>
>>> + /*
>>> + * The barrier is required to ensure that req_q_phy_addr writes to
>>> + * the memory.
>>> + */
>>> + wmb();
>>> +
>>> qdev->req_q_virt_addr =
>>> pci_alloc_consistent(qdev->pdev,
>>> (size_t) qdev->req_q_size,
>>
>> Your changes only take care of request queue but not response queue which also need barrier.
>
>Jiten,
>
>Thanks for review!
>The barrier to make sure writel() call for req_q_phy_addr and rsp_q_phy_addr in
>ql_adapter_initialize(), so I think call once wmb() is enough but I need to update
>the comment, any idea?
Yes and something like "ensure request/response queue addr writes to the register"
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