Commit de31049a authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

nfp: move temporary variables in nfp_net_tx_complete() 



Move temporary variables in scope of the loop in nfp_net_tx_complete(),
and add a temp for txbuf software structure.  This saves us 0.2% of CPU.

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: default avatarDirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 95862749

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

+17 −14
Original line number Diff line number Diff line
@@ -940,14 +940,10 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 
{

	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;

	struct nfp_net_dp *dp = &r_vec->nfp_net->dp;

	const struct skb_frag_struct *frag;

	struct netdev_queue *nd_q;

	u32 done_pkts = 0, done_bytes = 0;

	struct sk_buff *skb;

	int todo, nr_frags;

	u32 qcp_rd_p;

	int fidx;

	int idx;

	int todo;



	if (tx_ring->wr_p == tx_ring->rd_p)

		return;
@@ -961,26 +957,33 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 
	todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);



	while (todo--) {

		const struct skb_frag_struct *frag;

		struct nfp_net_tx_buf *tx_buf;

		struct sk_buff *skb;

		int fidx, nr_frags;

		int idx;



		idx = D_IDX(tx_ring, tx_ring->rd_p++);

		tx_buf = &tx_ring->txbufs[idx];



		skb = tx_ring->txbufs[idx].skb;

		skb = tx_buf->skb;

		if (!skb)

			continue;



		nr_frags = skb_shinfo(skb)->nr_frags;

		fidx = tx_ring->txbufs[idx].fidx;

		fidx = tx_buf->fidx;



		if (fidx == -1) {

			/* unmap head */

			dma_unmap_single(dp->dev, tx_ring->txbufs[idx].dma_addr,

			dma_unmap_single(dp->dev, tx_buf->dma_addr,

					 skb_headlen(skb), DMA_TO_DEVICE);



			done_pkts += tx_ring->txbufs[idx].pkt_cnt;

			done_bytes += tx_ring->txbufs[idx].real_len;

			done_pkts += tx_buf->pkt_cnt;

			done_bytes += tx_buf->real_len;

		} else {

			/* unmap fragment */

			frag = &skb_shinfo(skb)->frags[fidx];

			dma_unmap_page(dp->dev, tx_ring->txbufs[idx].dma_addr,

			dma_unmap_page(dp->dev, tx_buf->dma_addr,

				       skb_frag_size(frag), DMA_TO_DEVICE);

		}
@@ -988,9 +991,9 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 
		if (fidx == nr_frags - 1)

			napi_consume_skb(skb, budget);



		tx_ring->txbufs[idx].dma_addr = 0;

		tx_ring->txbufs[idx].skb = NULL;

		tx_ring->txbufs[idx].fidx = -2;

		tx_buf->dma_addr = 0;

		tx_buf->skb = NULL;

		tx_buf->fidx = -2;

	}



	tx_ring->qcp_rd_p = qcp_rd_p;

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