netdev - [PATCH net-next 4/9] iavf: switch to napi_build

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Date:   Tue, 28 Dec 2021 09:58:10 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Konrad Jankowski <konrad0.jankowski@...el.com>
Subject: [PATCH net-next 4/9] iavf: switch to napi_build_skb()

From: Alexander Lobakin <alexandr.lobakin@...el.com>

napi_build_skb() reuses per-cpu NAPI skbuff_head cache in order
to save some cycles on freeing/allocating skbuff_heads on every
new Rx or completed Tx.
iavf driver runs Tx completion polling cycle right before the Rx
one and uses napi_consume_skb() to feed the cache with skbuff_heads
of completed entries, so it's never empty and always warm at that
moment. Switch to the napi_build_skb() to relax mm pressure on
heavy Rx.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/iavf/iavf_txrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index a0b1c18a3273..8cbe7ad1347c 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -1366,7 +1366,7 @@ static struct sk_buff *iavf_build_skb(struct iavf_ring *rx_ring,
 	net_prefetch(va);
 
 	/* build an skb around the page buffer */
-	skb = build_skb(va - IAVF_SKB_PAD, truesize);
+	skb = napi_build_skb(va - IAVF_SKB_PAD, truesize);
 	if (unlikely(!skb))
 		return NULL;
 
-- 
2.31.1