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Date: Mon, 5 Dec 2016 09:07:07 -0800
From: Tushar Dave <tushar.n.dave@...cle.com>
To: jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org
Subject: [RFC PATCH] i40e: enable PCIe relax ordering for SPARC
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
[root@...-snt1-03 net]# 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:
[root@...-snt1-03 net]# 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@...cle.com>
---
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);
/* 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) {
@@ -1053,7 +1066,11 @@ void i40e_clean_rx_ring(struct i40e_ring *rx_ring)
if (!rx_bi->page)
continue;
- dma_unmap_page(dev, rx_bi->dma, PAGE_SIZE, DMA_FROM_DEVICE);
+ dma_unmap_single_attrs(dev,
+ rx_bi->dma,
+ PAGE_SIZE,
+ DMA_FROM_DEVICE,
+ rx_ring->dma_attrs);
__free_pages(rx_bi->page, 0);
rx_bi->page = NULL;
@@ -1113,6 +1130,11 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
/* Round up to nearest 4K */
rx_ring->size = rx_ring->count * sizeof(union i40e_32byte_rx_desc);
rx_ring->size = ALIGN(rx_ring->size, 4096);
+#ifdef CONFIG_SPARC
+ rx_ring->dma_attrs = DMA_ATTR_WEAK_ORDERING;
+#else
+ rx_ring->dma_attrs = 0;
+#endif
rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
&rx_ring->dma, GFP_KERNEL);
@@ -1182,7 +1204,8 @@ static bool i40e_alloc_mapped_page(struct i40e_ring *rx_ring,
}
/* map page for use */
- dma = dma_map_page(rx_ring->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+ dma = dma_map_single_attrs(rx_ring->dev, page_address(page), PAGE_SIZE,
+ DMA_FROM_DEVICE, rx_ring->dma_attrs);
/* if mapping failed free memory back to system since
* there isn't much point in holding memory we can't use
@@ -1695,8 +1718,11 @@ struct sk_buff *i40e_fetch_rx_buffer(struct i40e_ring *rx_ring,
rx_ring->rx_stats.page_reuse_count++;
} else {
/* we are not reusing the buffer so unmap it */
- dma_unmap_page(rx_ring->dev, rx_buffer->dma, PAGE_SIZE,
- DMA_FROM_DEVICE);
+ dma_unmap_single_attrs(rx_ring->dev,
+ rx_buffer->dma,
+ PAGE_SIZE,
+ DMA_FROM_DEVICE,
+ rx_ring->dma_attrs);
}
/* clear contents of buffer_info */
@@ -2737,7 +2763,8 @@ static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
first->skb = skb;
first->tx_flags = tx_flags;
- dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
+ dma = dma_map_single_attrs(tx_ring->dev, skb->data, size,
+ DMA_TO_DEVICE, tx_ring->dma_attrs);
tx_desc = I40E_TX_DESC(tx_ring, i);
tx_bi = first;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 5088405..9a86212 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -327,6 +327,7 @@ struct i40e_ring {
unsigned int size; /* length of descriptor ring in bytes */
dma_addr_t dma; /* physical address of ring */
+ unsigned long dma_attrs; /* DMA attributes */
struct i40e_vsi *vsi; /* Backreference to associated VSI */
struct i40e_q_vector *q_vector; /* Backreference to associated vector */
--
1.9.1
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