netdev - [RFC PATCH bpf-next 6/8] i40e: isolate descriptor processing in separate function

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Date:   Tue, 16 Nov 2021 07:37:40 +0000
From:   Ciara Loftus <ciara.loftus@...el.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, john.fastabend@...il.com,
        toke@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
        jonathan.lemon@...il.com, maciej.fijalkowski@...el.com,
        Ciara Loftus <ciara.loftus@...el.com>,
        Cristian Dumitrescu <cristian.dumitrescu@...el.com>
Subject: [RFC PATCH bpf-next 6/8] i40e: isolate descriptor processing in separate function

To prepare for batched processing, first isolate descriptor processing
in a separate function to make it easier to introduce the batched
interfaces.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@...el.com>
Signed-off-by: Ciara Loftus <ciara.loftus@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_xsk.c | 51 +++++++++++++++-------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 31b794672ea5..c994b4d9c38a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -323,28 +323,23 @@ static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
 	WARN_ON_ONCE(1);
 }
 
-/**
- * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
- * @rx_ring: Rx ring
- * @budget: NAPI budget
- *
- * Returns amount of work completed
- **/
-int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
+static inline void i40e_clean_rx_desc_zc(struct i40e_ring *rx_ring,
+					 unsigned int *stat_rx_packets,
+					 unsigned int *stat_rx_bytes,
+					 unsigned int *xmit,
+					 int budget)
 {
-	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
-	u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
+	unsigned int total_rx_packets = *stat_rx_packets, total_rx_bytes = *stat_rx_bytes;
 	u16 next_to_clean = rx_ring->next_to_clean;
 	u16 count_mask = rx_ring->count - 1;
-	unsigned int xdp_res, xdp_xmit = 0;
-	bool failure = false;
+	unsigned int xdp_xmit = *xmit;
 
 	while (likely(total_rx_packets < (unsigned int)budget)) {
 		union i40e_rx_desc *rx_desc;
+		unsigned int size, xdp_res;
 		unsigned int rx_packets;
 		unsigned int rx_bytes;
 		struct xdp_buff *bi;
-		unsigned int size;
 		u64 qword;
 
 		rx_desc = I40E_RX_DESC(rx_ring, next_to_clean);
@@ -385,7 +380,33 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 	}
 
 	rx_ring->next_to_clean = next_to_clean;
-	cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask;
+	*stat_rx_packets = total_rx_packets;
+	*stat_rx_bytes = total_rx_bytes;
+	*xmit = xdp_xmit;
+}
+
+/**
+ * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
+ * @rx_ring: Rx ring
+ * @budget: NAPI budget
+ *
+ * Returns amount of work completed
+ **/
+int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
+{
+	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
+	u16 count_mask = rx_ring->count - 1;
+	unsigned int xdp_xmit = 0;
+	bool failure = false;
+	u16 cleaned_count;
+
+	i40e_clean_rx_desc_zc(rx_ring,
+			      &total_rx_packets,
+			      &total_rx_bytes,
+			      &xdp_xmit,
+			      budget);
+
+	cleaned_count = (rx_ring->next_to_clean - rx_ring->next_to_use - 1) & count_mask;
 
 	if (cleaned_count >= I40E_RX_BUFFER_WRITE)
 		failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
@@ -394,7 +415,7 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 	i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
 
 	if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
-		if (failure || next_to_clean == rx_ring->next_to_use)
+		if (failure ||  rx_ring->next_to_clean == rx_ring->next_to_use)
 			xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
 		else
 			xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
-- 
2.17.1