netdev - [PATCH net-next 5/8] i40e: use frame_sz instead of recalculating truesize for building skb

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Date:   Mon,  6 Mar 2023 13:08:19 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, netdev@...r.kernel.org
Cc:     Tirthendu Sarkar <tirthendu.sarkar@...el.com>,
        anthony.l.nguyen@...el.com, maciej.fijalkowski@...el.com,
        magnus.karlsson@...el.com, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, bpf@...r.kernel.org,
        Chandan Kumar Rout <chandanx.rout@...el.com>
Subject: [PATCH net-next 5/8] i40e: use frame_sz instead of recalculating truesize for building skb

From: Tirthendu Sarkar <tirthendu.sarkar@...el.com>

In skb path truesize is calculated while building skb. This is now
avoided and xdp->frame_is used instead for both i40e_build_skb() and
i40e_construct_skb().

Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@...el.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@...el.com> (A Contingent Worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index fa44a2c353b2..e34595ca4fbe 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2113,11 +2113,6 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
 					  struct xdp_buff *xdp)
 {
 	unsigned int size = xdp->data_end - xdp->data;
-#if (PAGE_SIZE < 8192)
-	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
-#else
-	unsigned int truesize = SKB_DATA_ALIGN(size);
-#endif
 	unsigned int headlen;
 	struct sk_buff *skb;
 
@@ -2162,10 +2157,10 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
 	if (size) {
 		skb_add_rx_frag(skb, 0, rx_buffer->page,
 				rx_buffer->page_offset + headlen,
-				size, truesize);
+				size, xdp->frame_sz);
 
 		/* buffer is used by skb, update page_offset */
-		i40e_rx_buffer_flip(rx_buffer, truesize);
+		i40e_rx_buffer_flip(rx_buffer, xdp->frame_sz);
 	} else {
 		/* buffer is unused, reset bias back to rx_buffer */
 		rx_buffer->pagecnt_bias++;
@@ -2188,13 +2183,6 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
 				      struct xdp_buff *xdp)
 {
 	unsigned int metasize = xdp->data - xdp->data_meta;
-#if (PAGE_SIZE < 8192)
-	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
-#else
-	unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
-				SKB_DATA_ALIGN(xdp->data_end -
-					       xdp->data_hard_start);
-#endif
 	struct sk_buff *skb;
 
 	/* Prefetch first cache line of first page. If xdp->data_meta
@@ -2205,7 +2193,7 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
 	net_prefetch(xdp->data_meta);
 
 	/* build an skb around the page buffer */
-	skb = napi_build_skb(xdp->data_hard_start, truesize);
+	skb = napi_build_skb(xdp->data_hard_start, xdp->frame_sz);
 	if (unlikely(!skb))
 		return NULL;
 
@@ -2216,7 +2204,7 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
 		skb_metadata_set(skb, metasize);
 
 	/* buffer is used by skb, update page_offset */
-	i40e_rx_buffer_flip(rx_buffer, truesize);
+	i40e_rx_buffer_flip(rx_buffer, xdp->frame_sz);
 
 	return skb;
 }
-- 
2.38.1