[net-next v2 0/5][pull request] 40GbE Intel Wired LAN Driver Updates 2020-09-14

[net-next v2 0/5][pull request] 40GbE Intel Wired LAN Driver Updates 2020-09-14

[Tony Nguyen]

This series contains updates to i40e driver only.

Li RongQing removes binding affinity mask to a fixed CPU and sets
prefetch of Rx buffer page to occur conditionally.

Björn provides AF_XDP performance improvements by not prefetching HW
descriptors, using 16 byte descriptors, and moving buffer allocation
out of Rx processing loop.

v2: Define prefetch_page_address in a common header for patch 2.
Dropped, previous, patch 5 as it is being reworked to be more
generalized.

The following are changes since commit e059c6f340f6fccadd3db9993f06d4cc51305804:
  tulip: switch from 'pci_' to 'dma_' API
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue 40GbE

Björn Töpel (3):
  i40e, xsk: remove HW descriptor prefetch in AF_XDP path
  i40e: use 16B HW descriptors instead of 32B
  i40e, xsk: move buffer allocation out of the Rx processing loop

Li RongQing (2):
  i40e: not compute affinity_mask for IRQ
  i40e: optimise prefetch page refcount

 drivers/net/ethernet/intel/i40e/i40e.h        |  2 +-
 .../net/ethernet/intel/i40e/i40e_debugfs.c    | 10 ++++----
 drivers/net/ethernet/intel/i40e/i40e_main.c   | 16 ++++---------
 drivers/net/ethernet/intel/i40e/i40e_trace.h  |  6 ++---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c   | 21 ++++++++++++----
 drivers/net/ethernet/intel/i40e/i40e_txrx.h   |  2 +-
 .../ethernet/intel/i40e/i40e_txrx_common.h    | 13 ----------
 drivers/net/ethernet/intel/i40e/i40e_type.h   |  5 +++-
 drivers/net/ethernet/intel/i40e/i40e_xsk.c    | 24 ++++++++++++-------
 include/linux/prefetch.h                      |  8 +++++++
 10 files changed, 59 insertions(+), 48 deletions(-)

-- 
2.26.2

[net-next v2 1/5] i40e: not compute affinity_mask for IRQ

[Tony Nguyen]

From: Li RongQing <lirongqing@baidu.com>

After commit 759dc4a7e605 ("i40e: initialize our affinity_mask
based on cpu_possible_mask"), NAPI IRQ affinity_mask is bind to
all possible CPUs, not a fixed CPU

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 05c6d3ea11e6..9cfaa99da4e6 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -11186,11 +11186,10 @@ static int i40e_init_msix(struct i40e_pf *pf)
  * i40e_vsi_alloc_q_vector - Allocate memory for a single interrupt vector
  * @vsi: the VSI being configured
  * @v_idx: index of the vector in the vsi struct
- * @cpu: cpu to be used on affinity_mask
  *
  * We allocate one q_vector.  If allocation fails we return -ENOMEM.
  **/
-static int i40e_vsi_alloc_q_vector(struct i40e_vsi *vsi, int v_idx, int cpu)
+static int i40e_vsi_alloc_q_vector(struct i40e_vsi *vsi, int v_idx)
 {
 	struct i40e_q_vector *q_vector;
 
@@ -11223,7 +11222,7 @@ static int i40e_vsi_alloc_q_vector(struct i40e_vsi *vsi, int v_idx, int cpu)
 static int i40e_vsi_alloc_q_vectors(struct i40e_vsi *vsi)
 {
 	struct i40e_pf *pf = vsi->back;
-	int err, v_idx, num_q_vectors, current_cpu;
+	int err, v_idx, num_q_vectors;
 
 	/* if not MSIX, give the one vector only to the LAN VSI */
 	if (pf->flags & I40E_FLAG_MSIX_ENABLED)
@@ -11233,15 +11232,10 @@ static int i40e_vsi_alloc_q_vectors(struct i40e_vsi *vsi)
 	else
 		return -EINVAL;
 
-	current_cpu = cpumask_first(cpu_online_mask);
-
 	for (v_idx = 0; v_idx < num_q_vectors; v_idx++) {
-		err = i40e_vsi_alloc_q_vector(vsi, v_idx, current_cpu);
+		err = i40e_vsi_alloc_q_vector(vsi, v_idx);
 		if (err)
 			goto err_out;
-		current_cpu = cpumask_next(current_cpu, cpu_online_mask);
-		if (unlikely(current_cpu >= nr_cpu_ids))
-			current_cpu = cpumask_first(cpu_online_mask);
 	}
 
 	return 0;
-- 
2.26.2

[net-next v2 2/5] i40e: optimise prefetch page refcount

[Tony Nguyen]

From: Li RongQing <lirongqing@baidu.com>

refcount of rx_buffer page will be added here originally, so prefetchw
is needed, but after commit 1793668c3b8c ("i40e/i40evf: Update code to
better handle incrementing page count"), and refcount is not added
every time, so change prefetchw as prefetch.

Now it mainly services page_address(), but which accesses struct page
only when WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL is defined otherwise
it returns address based on offset, so we prefetch it conditionally.

Jakub suggested to define prefetch_page_address in a common header.

Reported-by: kernel test robot <lkp@intel.com>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 +-
 include/linux/prefetch.h                    | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 91ab824926b9..8500e1c1a16b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1953,7 +1953,7 @@ static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring,
 	struct i40e_rx_buffer *rx_buffer;
 
 	rx_buffer = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
-	prefetchw(rx_buffer->page);
+	prefetch_page_address(rx_buffer->page);
 
 	/* we are reusing so sync this buffer for CPU use */
 	dma_sync_single_range_for_cpu(rx_ring->dev,
diff --git a/include/linux/prefetch.h b/include/linux/prefetch.h
index 13eafebf3549..b83a3f944f28 100644
--- a/include/linux/prefetch.h
+++ b/include/linux/prefetch.h
@@ -15,6 +15,7 @@
 #include <asm/processor.h>
 #include <asm/cache.h>
 
+struct page;
 /*
 	prefetch(x) attempts to pre-emptively get the memory pointed to
 	by address "x" into the CPU L1 cache. 
@@ -62,4 +63,11 @@ static inline void prefetch_range(void *addr, size_t len)
 #endif
 }
 
+static inline void prefetch_page_address(struct page *page)
+{
+#if defined(WANT_PAGE_VIRTUAL) || defined(HASHED_PAGE_VIRTUAL)
+	prefetch(page);
+#endif
+}
+
 #endif
-- 
2.26.2

[net-next v2 3/5] i40e, xsk: remove HW descriptor prefetch in AF_XDP path

[Tony Nguyen]

From: Björn Töpel <bjorn.topel@intel.com>

The software prefetching of HW descriptors has a negative impact on
the performance. Therefore, it is now removed.

Performance for the rx_drop benchmark increased with 2%.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c        | 13 +++++++++++++
 drivers/net/ethernet/intel/i40e/i40e_txrx_common.h | 13 -------------
 drivers/net/ethernet/intel/i40e/i40e_xsk.c         | 12 ++++++++++++
 3 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 8500e1c1a16b..b43bc20f701d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2295,6 +2295,19 @@ void i40e_finalize_xdp_rx(struct i40e_ring *rx_ring, unsigned int xdp_res)
 	}
 }
 
+/**
+ * i40e_inc_ntc: Advance the next_to_clean index
+ * @rx_ring: Rx ring
+ **/
+static void i40e_inc_ntc(struct i40e_ring *rx_ring)
+{
+	u32 ntc = rx_ring->next_to_clean + 1;
+
+	ntc = (ntc < rx_ring->count) ? ntc : 0;
+	rx_ring->next_to_clean = ntc;
+	prefetch(I40E_RX_DESC(rx_ring, ntc));
+}
+
 /**
  * i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
  * @rx_ring: rx descriptor ring to transact packets on
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h b/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h
index 667c4dc4b39f..1397dd3c1c57 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h
@@ -99,19 +99,6 @@ static inline bool i40e_rx_is_programming_status(u64 qword1)
 	return qword1 & I40E_RXD_QW1_LENGTH_SPH_MASK;
 }
 
-/**
- * i40e_inc_ntc: Advance the next_to_clean index
- * @rx_ring: Rx ring
- **/
-static inline void i40e_inc_ntc(struct i40e_ring *rx_ring)
-{
-	u32 ntc = rx_ring->next_to_clean + 1;
-
-	ntc = (ntc < rx_ring->count) ? ntc : 0;
-	rx_ring->next_to_clean = ntc;
-	prefetch(I40E_RX_DESC(rx_ring, ntc));
-}
-
 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring);
 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring);
 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 2a1153d8957b..cf48758447c2 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -257,6 +257,18 @@ static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
 	return skb;
 }
 
+/**
+ * i40e_inc_ntc: Advance the next_to_clean index
+ * @rx_ring: Rx ring
+ **/
+static void i40e_inc_ntc(struct i40e_ring *rx_ring)
+{
+	u32 ntc = rx_ring->next_to_clean + 1;
+
+	ntc = (ntc < rx_ring->count) ? ntc : 0;
+	rx_ring->next_to_clean = ntc;
+}
+
 /**
  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
  * @rx_ring: Rx ring
-- 
2.26.2

[net-next v2 4/5] i40e: use 16B HW descriptors instead of 32B

[Tony Nguyen]

From: Björn Töpel <bjorn.topel@intel.com>

The i40e NIC supports two flavors of HW descriptors, 16 and 32
byte. The latter has, obviously, room for more offloading
information. However, the only fields of the 32B HW descriptor that is
being used by the driver, is also available in the 16B descriptor.

In other words; Reading and writing 32 bytes instead of 16 byte is a
waste of bus bandwidth.

This commit starts using 16 byte descriptors instead of 32 byte
descriptors.

For AF_XDP the rx_drop benchmark was improved by 2%.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e.h         |  2 +-
 drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 10 ++++------
 drivers/net/ethernet/intel/i40e/i40e_main.c    |  4 ++--
 drivers/net/ethernet/intel/i40e/i40e_trace.h   |  6 +++---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c    |  6 +++---
 drivers/net/ethernet/intel/i40e/i40e_txrx.h    |  2 +-
 drivers/net/ethernet/intel/i40e/i40e_type.h    |  5 ++++-
 7 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index a7e212d1caa2..ada0e93c38f0 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -90,7 +90,7 @@
 #define I40E_OEM_RELEASE_MASK		0x0000ffff
 
 #define I40E_RX_DESC(R, i)	\
-	(&(((union i40e_32byte_rx_desc *)((R)->desc))[i]))
+	(&(((union i40e_rx_desc *)((R)->desc))[i]))
 #define I40E_TX_DESC(R, i)	\
 	(&(((struct i40e_tx_desc *)((R)->desc))[i]))
 #define I40E_TX_CTXTDESC(R, i)	\
diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
index d3ad2e3aa838..d7c13ca9be7d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
@@ -604,10 +604,9 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n,
 			} else {
 				rxd = I40E_RX_DESC(ring, i);
 				dev_info(&pf->pdev->dev,
-					 "   d[%03x] = 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n",
+					 "   d[%03x] = 0x%016llx 0x%016llx\n",
 					 i, rxd->read.pkt_addr,
-					 rxd->read.hdr_addr,
-					 rxd->read.rsvd1, rxd->read.rsvd2);
+					 rxd->read.hdr_addr);
 			}
 		}
 	} else if (cnt == 3) {
@@ -625,10 +624,9 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n,
 		} else {
 			rxd = I40E_RX_DESC(ring, desc_n);
 			dev_info(&pf->pdev->dev,
-				 "vsi = %02i rx ring = %02i d[%03x] = 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n",
+				 "vsi = %02i rx ring = %02i d[%03x] = 0x%016llx 0x%016llx\n",
 				 vsi_seid, ring_id, desc_n,
-				 rxd->read.pkt_addr, rxd->read.hdr_addr,
-				 rxd->read.rsvd1, rxd->read.rsvd2);
+				 rxd->read.pkt_addr, rxd->read.hdr_addr);
 		}
 	} else {
 		dev_info(&pf->pdev->dev, "dump desc rx/tx/xdp <vsi_seid> <ring_id> [<desc_n>]\n");
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 9cfaa99da4e6..07207e21874f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3321,8 +3321,8 @@ static int i40e_configure_rx_ring(struct i40e_ring *ring)
 	rx_ctx.base = (ring->dma / 128);
 	rx_ctx.qlen = ring->count;
 
-	/* use 32 byte descriptors */
-	rx_ctx.dsize = 1;
+	/* use 16 byte descriptors */
+	rx_ctx.dsize = 0;
 
 	/* descriptor type is always zero
 	 * rx_ctx.dtype = 0;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_trace.h b/drivers/net/ethernet/intel/i40e/i40e_trace.h
index 424f02077e2e..983f8b98b275 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_trace.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_trace.h
@@ -112,7 +112,7 @@ DECLARE_EVENT_CLASS(
 	i40e_rx_template,
 
 	TP_PROTO(struct i40e_ring *ring,
-		 union i40e_32byte_rx_desc *desc,
+		 union i40e_16byte_rx_desc *desc,
 		 struct sk_buff *skb),
 
 	TP_ARGS(ring, desc, skb),
@@ -140,7 +140,7 @@ DECLARE_EVENT_CLASS(
 DEFINE_EVENT(
 	i40e_rx_template, i40e_clean_rx_irq,
 	TP_PROTO(struct i40e_ring *ring,
-		 union i40e_32byte_rx_desc *desc,
+		 union i40e_16byte_rx_desc *desc,
 		 struct sk_buff *skb),
 
 	TP_ARGS(ring, desc, skb));
@@ -148,7 +148,7 @@ DEFINE_EVENT(
 DEFINE_EVENT(
 	i40e_rx_template, i40e_clean_rx_irq_rx,
 	TP_PROTO(struct i40e_ring *ring,
-		 union i40e_32byte_rx_desc *desc,
+		 union i40e_16byte_rx_desc *desc,
 		 struct sk_buff *skb),
 
 	TP_ARGS(ring, desc, skb));
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index b43bc20f701d..1606ba5318f7 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -533,11 +533,11 @@ static void i40e_fd_handle_status(struct i40e_ring *rx_ring, u64 qword0_raw,
 {
 	struct i40e_pf *pf = rx_ring->vsi->back;
 	struct pci_dev *pdev = pf->pdev;
-	struct i40e_32b_rx_wb_qw0 *qw0;
+	struct i40e_16b_rx_wb_qw0 *qw0;
 	u32 fcnt_prog, fcnt_avail;
 	u32 error;
 
-	qw0 = (struct i40e_32b_rx_wb_qw0 *)&qword0_raw;
+	qw0 = (struct i40e_16b_rx_wb_qw0 *)&qword0_raw;
 	error = (qword1 & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
 		I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
 
@@ -1418,7 +1418,7 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
 	u64_stats_init(&rx_ring->syncp);
 
 	/* Round up to nearest 4K */
-	rx_ring->size = rx_ring->count * sizeof(union i40e_32byte_rx_desc);
+	rx_ring->size = rx_ring->count * sizeof(union i40e_rx_desc);
 	rx_ring->size = ALIGN(rx_ring->size, 4096);
 	rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
 					   &rx_ring->dma, GFP_KERNEL);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 703b644fd71f..66c2b92c0d10 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -110,7 +110,7 @@ enum i40e_dyn_idx_t {
  */
 #define I40E_RX_HDR_SIZE I40E_RXBUFFER_256
 #define I40E_PACKET_HDR_PAD (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
-#define i40e_rx_desc i40e_32byte_rx_desc
+#define i40e_rx_desc i40e_16byte_rx_desc
 
 #define I40E_RX_DMA_ATTR \
 	(DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
index 52410d609ba1..97d29df65f9e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
@@ -628,7 +628,7 @@ union i40e_16byte_rx_desc {
 		__le64 hdr_addr; /* Header buffer address */
 	} read;
 	struct {
-		struct {
+		struct i40e_16b_rx_wb_qw0 {
 			struct {
 				union {
 					__le16 mirroring_status;
@@ -647,6 +647,9 @@ union i40e_16byte_rx_desc {
 			__le64 status_error_len;
 		} qword1;
 	} wb;  /* writeback */
+	struct {
+		u64 qword[2];
+	} raw;
 };
 
 union i40e_32byte_rx_desc {
-- 
2.26.2

[net-next v2 5/5] i40e, xsk: move buffer allocation out of the Rx processing loop

[Tony Nguyen]

From: Björn Töpel <bjorn.topel@intel.com>

Instead of checking in each iteration of the Rx packet processing
loop, move the allocation out of the loop and do it once for each napi
activation.

For AF_XDP the rx_drop benchmark was improved by 6%.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_xsk.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index cf48758447c2..6acede0acdca 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -281,8 +281,8 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 	u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
 	unsigned int xdp_res, xdp_xmit = 0;
-	bool failure = false;
 	struct sk_buff *skb;
+	bool failure;
 
 	while (likely(total_rx_packets < (unsigned int)budget)) {
 		union i40e_rx_desc *rx_desc;
@@ -290,13 +290,6 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 		unsigned int size;
 		u64 qword;
 
-		if (cleaned_count >= I40E_RX_BUFFER_WRITE) {
-			failure = failure ||
-				  !i40e_alloc_rx_buffers_zc(rx_ring,
-							    cleaned_count);
-			cleaned_count = 0;
-		}
-
 		rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean);
 		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 
@@ -371,6 +364,9 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 		napi_gro_receive(&rx_ring->q_vector->napi, skb);
 	}
 
+	if (cleaned_count >= I40E_RX_BUFFER_WRITE)
+		failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
+
 	i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
 	i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
 
-- 
2.26.2

Re: [net-next v2 0/5][pull request] 40GbE Intel Wired LAN Driver Updates 2020-09-14

[David Miller]

From: Tony Nguyen <anthony.l.nguyen@intel.com>
Date: Mon, 14 Sep 2020 10:32:19 -0700

> This series contains updates to i40e driver only.
> 
> Li RongQing removes binding affinity mask to a fixed CPU and sets
> prefetch of Rx buffer page to occur conditionally.
> 
> Björn provides AF_XDP performance improvements by not prefetching HW
> descriptors, using 16 byte descriptors, and moving buffer allocation
> out of Rx processing loop.
> 
> v2: Define prefetch_page_address in a common header for patch 2.
> Dropped, previous, patch 5 as it is being reworked to be more
> generalized.
> 
> The following are changes since commit e059c6f340f6fccadd3db9993f06d4cc51305804:
>   tulip: switch from 'pci_' to 'dma_' API
> and are available in the git repository at:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue 40GbE

Looks good, pulled, thanks Tony.