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    Subject[PATCH net-next 3/9] i40e: switch to napi_build_skb()
    Date
    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.
    i40e 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@intel.com>
    Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
    ---
    drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
    index 10a83e5385c7..9e3991caa5c9 100644
    --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
    +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
    @@ -2204,7 +2204,7 @@ 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 = build_skb(xdp->data_hard_start, truesize);
    + skb = napi_build_skb(xdp->data_hard_start, truesize);
    if (unlikely(!skb))
    return NULL;

    --
    2.33.1
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