[Intel-wired-lan] [RFC PATCH] i40e: enable PCIe relax ordering for SPARC

tndave tushar.n.dave at oracle.com
Tue Dec 6 22:04:09 UTC 2016



On 12/06/2016 09:10 AM, Alexander Duyck wrote:
> On Mon, Dec 5, 2016 at 2:23 PM, tndave <tushar.n.dave at oracle.com> wrote:
>>
>>
>> On 12/05/2016 01:54 PM, Alexander Duyck wrote:
>>>
>>> On Mon, Dec 5, 2016 at 9:07 AM, Tushar Dave <tushar.n.dave at oracle.com>
>>> wrote:
>>>>
>>>> Unlike previous generation NIC (e.g. ixgbe) i40e doesn't seem to have
>>>> standard CSR where PCIe relaxed ordering can be set. Without PCIe relax
>>>> ordering enabled, i40e performance is significantly low on SPARC.
>>>>
>>>> This patch sets PCIe relax ordering for SPARC arch by setting dma attr
>>>> DMA_ATTR_WEAK_ORDERING for every tx and rx DMA map/unmap.
>>>> This has shown 10x increase in performance numbers.
>>>>
>>>> e.g.
>>>> iperf TCP test with 10 threads on SPARC S7
>>>>
>>>> Test 1: Without this patch
>>>>
>>>> # iperf -s
>>>> ------------------------------------------------------------
>>>> Server listening on TCP port 5001
>>>> TCP window size: 85.3 KByte (default)
>>>> ------------------------------------------------------------
>>>> [  4] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40926
>>>> [  5] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40934
>>>> [  6] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40930
>>>> [  7] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40928
>>>> [  8] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40922
>>>> [  9] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40932
>>>> [ 10] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40920
>>>> [ 11] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40924
>>>> [ 14] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40982
>>>> [ 12] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 40980
>>>> [ ID] Interval       Transfer     Bandwidth
>>>> [  4]  0.0-20.0 sec   566 MBytes   237 Mbits/sec
>>>> [  5]  0.0-20.0 sec   532 MBytes   223 Mbits/sec
>>>> [  6]  0.0-20.0 sec   537 MBytes   225 Mbits/sec
>>>> [  8]  0.0-20.0 sec   546 MBytes   229 Mbits/sec
>>>> [ 11]  0.0-20.0 sec   592 MBytes   248 Mbits/sec
>>>> [  7]  0.0-20.0 sec   539 MBytes   226 Mbits/sec
>>>> [  9]  0.0-20.0 sec   572 MBytes   240 Mbits/sec
>>>> [ 10]  0.0-20.0 sec   604 MBytes   253 Mbits/sec
>>>> [ 14]  0.0-20.0 sec   567 MBytes   238 Mbits/sec
>>>> [ 12]  0.0-20.0 sec   511 MBytes   214 Mbits/sec
>>>> [SUM]  0.0-20.0 sec  5.44 GBytes  2.33 Gbits/sec
>>>>
>>>> Test 2: with this patch:
>>>>
>>>> # iperf -s
>>>> ------------------------------------------------------------
>>>> Server listening on TCP port 5001
>>>> TCP window size: 85.3 KByte (default)
>>>> ------------------------------------------------------------
>>>> TCP: request_sock_TCP: Possible SYN flooding on port 5001. Sending
>>>> cookies.  Check SNMP counters.
>>>> [  4] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46876
>>>> [  5] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46874
>>>> [  6] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46872
>>>> [  7] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46880
>>>> [  8] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46878
>>>> [  9] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46884
>>>> [ 10] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46886
>>>> [ 11] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46890
>>>> [ 12] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46888
>>>> [ 13] local 16.0.0.7 port 5001 connected with 16.0.0.1 port 46882
>>>> [ ID] Interval       Transfer     Bandwidth
>>>> [  4]  0.0-20.0 sec  7.45 GBytes  3.19 Gbits/sec
>>>> [  5]  0.0-20.0 sec  7.48 GBytes  3.21 Gbits/sec
>>>> [  7]  0.0-20.0 sec  7.34 GBytes  3.15 Gbits/sec
>>>> [  8]  0.0-20.0 sec  7.42 GBytes  3.18 Gbits/sec
>>>> [  9]  0.0-20.0 sec  7.24 GBytes  3.11 Gbits/sec
>>>> [ 10]  0.0-20.0 sec  7.40 GBytes  3.17 Gbits/sec
>>>> [ 12]  0.0-20.0 sec  7.49 GBytes  3.21 Gbits/sec
>>>> [  6]  0.0-20.0 sec  7.30 GBytes  3.13 Gbits/sec
>>>> [ 11]  0.0-20.0 sec  7.44 GBytes  3.19 Gbits/sec
>>>> [ 13]  0.0-20.0 sec  7.22 GBytes  3.10 Gbits/sec
>>>> [SUM]  0.0-20.0 sec  73.8 GBytes  31.6 Gbits/sec
>>>>
>>>> NOTE: In my testing, this patch does _not_ show any harm to i40e
>>>> performance numbers on x86.
>>>>
>>>> Signed-off-by: Tushar Dave <tushar.n.dave at oracle.com>
>>>
>>>
>>> You went through and replaced all of the dma_unmap/map_page calls with
>>> dma_map/unmap_single_attrs  I would prefer you didn't do that.  I have
>>
>> Yes, because currently there is no DMA API for dma_map/unmap_page with dma
>> attr*
>>>
>>> patches to add the ability to map and unmap pages with attributes that
>>> should be available for 4.10-rc1 so if you could wait on this patch
>>> until then it would be preferred.
>>
>> :-) thanks. I will wait until your patches are out.
>>
>>>
>>>> ---
>>>>  drivers/net/ethernet/intel/i40e/i40e_txrx.c | 69
>>>> ++++++++++++++++++++---------
>>>>  drivers/net/ethernet/intel/i40e/i40e_txrx.h |  1 +
>>>>  2 files changed, 49 insertions(+), 21 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
>>>> b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
>>>> index 6287bf6..800dca7 100644
>>>> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
>>>> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
>>>> @@ -551,15 +551,17 @@ static void i40e_unmap_and_free_tx_resource(struct
>>>> i40e_ring *ring,
>>>>                 else
>>>>                         dev_kfree_skb_any(tx_buffer->skb);
>>>>                 if (dma_unmap_len(tx_buffer, len))
>>>> -                       dma_unmap_single(ring->dev,
>>>> -                                        dma_unmap_addr(tx_buffer, dma),
>>>> -                                        dma_unmap_len(tx_buffer, len),
>>>> -                                        DMA_TO_DEVICE);
>>>> +                       dma_unmap_single_attrs(ring->dev,
>>>> +                                              dma_unmap_addr(tx_buffer,
>>>> dma),
>>>> +                                              dma_unmap_len(tx_buffer,
>>>> len),
>>>> +                                              DMA_TO_DEVICE,
>>>> +                                              ring->dma_attrs);
>>>>         } else if (dma_unmap_len(tx_buffer, len)) {
>>>> -               dma_unmap_page(ring->dev,
>>>> -                              dma_unmap_addr(tx_buffer, dma),
>>>> -                              dma_unmap_len(tx_buffer, len),
>>>> -                              DMA_TO_DEVICE);
>>>> +               dma_unmap_single_attrs(ring->dev,
>>>> +                                      dma_unmap_addr(tx_buffer, dma),
>>>> +                                      dma_unmap_len(tx_buffer, len),
>>>> +                                      DMA_TO_DEVICE,
>>>> +                                      ring->dma_attrs);
>>>>         }
>>>>
>>>>         tx_buffer->next_to_watch = NULL;
>>>> @@ -662,6 +664,8 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
>>>>         struct i40e_tx_buffer *tx_buf;
>>>>         struct i40e_tx_desc *tx_head;
>>>>         struct i40e_tx_desc *tx_desc;
>>>> +       dma_addr_t addr;
>>>> +       size_t size;
>>>>         unsigned int total_bytes = 0, total_packets = 0;
>>>>         unsigned int budget = vsi->work_limit;
>>>>
>>>> @@ -696,10 +700,11 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
>>>>                 napi_consume_skb(tx_buf->skb, napi_budget);
>>>>
>>>>                 /* unmap skb header data */
>>>> -               dma_unmap_single(tx_ring->dev,
>>>> -                                dma_unmap_addr(tx_buf, dma),
>>>> -                                dma_unmap_len(tx_buf, len),
>>>> -                                DMA_TO_DEVICE);
>>>> +               dma_unmap_single_attrs(tx_ring->dev,
>>>> +                                      dma_unmap_addr(tx_buf, dma),
>>>> +                                      dma_unmap_len(tx_buf, len),
>>>> +                                      DMA_TO_DEVICE,
>>>> +                                      tx_ring->dma_attrs);
>>>>
>>>>                 /* clear tx_buffer data */
>>>>                 tx_buf->skb = NULL;
>>>> @@ -717,12 +722,15 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
>>>>                                 tx_desc = I40E_TX_DESC(tx_ring, 0);
>>>>                         }
>>>>
>>>> +                       addr = dma_unmap_addr(tx_buf, dma);
>>>> +                       size = dma_unmap_len(tx_buf, len);
>>>
>>>
>>> On some architectures this change could lead to issues since
>>> dma_unmap_len could be 0 meaning that addr would never be used.
>>
>> I see. Thanks.
>>
>>>
>>>>                         /* unmap any remaining paged data */
>>>>                         if (dma_unmap_len(tx_buf, len)) {
>>>> -                               dma_unmap_page(tx_ring->dev,
>>>> -                                              dma_unmap_addr(tx_buf,
>>>> dma),
>>>> -                                              dma_unmap_len(tx_buf,
>>>> len),
>>>> -                                              DMA_TO_DEVICE);
>>>> +                               dma_unmap_single_attrs(tx_ring->dev,
>>>> +                                                      addr,
>>>> +                                                      size,
>>>> +                                                      DMA_TO_DEVICE,
>>>> +
>>>> tx_ring->dma_attrs);
>>>>                                 dma_unmap_len_set(tx_buf, len, 0);
>>>>                         }
>>>>                 }
>>>> @@ -1010,6 +1018,11 @@ int i40e_setup_tx_descriptors(struct i40e_ring
>>>> *tx_ring)
>>>>          */
>>>>         tx_ring->size += sizeof(u32);
>>>>         tx_ring->size = ALIGN(tx_ring->size, 4096);
>>>> +#ifdef CONFIG_SPARC
>>>> +       tx_ring->dma_attrs = DMA_ATTR_WEAK_ORDERING;
>>>> +#else
>>>> +       tx_ring->dma_attrs = 0;
>>>> +#endif
>>>>         tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
>>>>                                            &tx_ring->dma, GFP_KERNEL);
>>>>         if (!tx_ring->desc) {
>>>
>>>
>>> Also not a fan of adding yet ring attribute.  Is there any reason why
>>> you couldn't simply add a set of inline functions at the start of
>>> i40e_txrx.c that could replace the DMA map/unmap operations in this
>>> code but pass either 0 or DMA_ATTR_WEAK_ORDERING as needed for the
>>> drivers?  Then the x86 code doesn't have to change while the SPARC
>>> code will be able to be passed the attribute.
>>
>> Sure I can do that.
>>
>> I will follow up with patch after your patches for map/unmap page with dma
>> attr will be out.
>>
>> Thanks.
>>
>> -Tushar
>>
>
> I was thinking about it and I realized we can probably simplify this
> even further.  In the case of most other architectures the
> DMA_ATTR_WEAK_ORDERING has no effect anyway.  So from what I can
> tell there is probably no reason not to just always pass that
> attribute with the DMA mappings.  From what I can tell the only
> other architecture that uses this is the PowerPC Cell architecture.
Yes, besides SPARC64, only PowerPC Cell architecture uses
DMA_ATTR_WEAK_ORDERING; I guess it should be okay to always pass
DMA_ATTR_WEAK_ORDERING.
>
> Also I was wondering if you actually needed to enable this attribute
> for both Rx and Tx buffers or just Rx buffers?  The patch that
> enabled DMA_ATTR_WEAK_ORDERING for Sparc64 seems to call out writes,
> but I didn't see anything about reads.  I'm just wondering if
> changing the code for Tx has any effect?  If not you could probably
> drop those changes and just focus on Rx.
The patch I sent enabled DMA_ATTR_WEAK_ORDERING for sparc64 so that
write to & read from both rx and tx dma buffers can be relaxed order.

Passing DMA_ATTR_WEAK_ORDERING for tx dma buff doesn't have the same
impact as it has with DMA_ATTR_WEAK_ORDERING and rx dma buffers.
However, I can only confirm if DMA_ATTR_WEAK_ORDERING is not needed at
all for tx dma buffer after collecting some more data!

Thanks.

-Tushar

>
> Thanks.
>
> - Alex
>


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