From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: netdev@vger.kernel.org
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Subject: [PATCH net-next 09/14] nfp: use AND instead of modulo to get ring indexes
Date: Mon, 31 Oct 2016 20:43:17 +0000 [thread overview]
Message-ID: <1477946602-19644-10-git-send-email-jakub.kicinski@netronome.com> (raw)
In-Reply-To: <1477946602-19644-1-git-send-email-jakub.kicinski@netronome.com>
We already force ring sizes to be power of 2 so replace
modulo operations with AND (size - 1) in index calculations.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index b43d2dbae368..7225ab61a120 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -778,7 +778,7 @@ static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
if (dma_mapping_error(&nn->pdev->dev, dma_addr))
goto err_free;
- wr_idx = tx_ring->wr_p % tx_ring->cnt;
+ wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
@@ -822,7 +822,7 @@ static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
if (dma_mapping_error(&nn->pdev->dev, dma_addr))
goto err_unmap;
- wr_idx = (wr_idx + 1) % tx_ring->cnt;
+ wr_idx = (wr_idx + 1) & (tx_ring->cnt - 1);
tx_ring->txbufs[wr_idx].skb = skb;
tx_ring->txbufs[wr_idx].dma_addr = dma_addr;
tx_ring->txbufs[wr_idx].fidx = f;
@@ -917,7 +917,7 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p;
while (todo--) {
- idx = tx_ring->rd_p % tx_ring->cnt;
+ idx = tx_ring->rd_p & (tx_ring->cnt - 1);
tx_ring->rd_p++;
skb = tx_ring->txbufs[idx].skb;
@@ -992,7 +992,7 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
int nr_frags, fidx, idx;
struct sk_buff *skb;
- idx = tx_ring->rd_p % tx_ring->cnt;
+ idx = tx_ring->rd_p & (tx_ring->cnt - 1);
skb = tx_ring->txbufs[idx].skb;
nr_frags = skb_shinfo(skb)->nr_frags;
fidx = tx_ring->txbufs[idx].fidx;
@@ -1129,7 +1129,7 @@ static void nfp_net_rx_give_one(struct nfp_net_rx_ring *rx_ring,
{
unsigned int wr_idx;
- wr_idx = rx_ring->wr_p % rx_ring->cnt;
+ wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1);
/* Stash SKB and DMA address away */
rx_ring->rxbufs[wr_idx].frag = frag;
@@ -1164,7 +1164,7 @@ static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
unsigned int wr_idx, last_idx;
/* Move the empty entry to the end of the list */
- wr_idx = rx_ring->wr_p % rx_ring->cnt;
+ wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1);
last_idx = rx_ring->cnt - 1;
rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr;
rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag;
@@ -1413,7 +1413,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
int idx;
while (pkts_polled < budget) {
- idx = rx_ring->rd_p % rx_ring->cnt;
+ idx = rx_ring->rd_p & (rx_ring->cnt - 1);
rxd = &rx_ring->rxds[idx];
if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
--
1.9.1
next prev parent reply other threads:[~2016-10-31 20:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-31 20:43 [PATCH net-next 00/14] cleanups and RX path rewrite Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 01/14] nfp: simplify nfp_net_poll() Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 02/14] nfp: remove support for nfp3200 Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 03/14] nfp: remove unnecessary call to ether_setup() Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 04/14] nfp: remove inline attributes and dead code Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 05/14] nfp: centralize the buffer size calculation Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 06/14] nfp: add buffer drop/recycle helper for RX Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 07/14] nfp: use alloc_frag() and build_skb() Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 08/14] nfp: add separate buffer allocation function for napi Jakub Kicinski
2016-10-31 20:43 ` Jakub Kicinski [this message]
2016-10-31 20:43 ` [PATCH net-next 10/14] nfp: create separate define for max number of vectors Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 11/14] nfp: use unsigned int for vector/ring counts Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 12/14] nfp: remove nfp_net_irqs_wanted() Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 13/14] nfp: replace num_irqs with max_r_vecs Jakub Kicinski
2016-10-31 20:43 ` [PATCH net-next 14/14] nfp: bring back support for different ring counts Jakub Kicinski
2016-11-01 15:05 ` [PATCH net-next 00/14] cleanups and RX path rewrite David Miller
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