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Date: Mon, 29 Feb 2016 14:27:34 +0100
From: Alexandre TORGUE <alexandre.torgue@...com>
To: <netdev@...r.kernel.org>
CC: <peppe.cavallaro@...com>, <fabrice.gasnier@...com>,
<maxime.coquelin@...com>
Subject: [PATCH v3 08/17] stmmac: merge get_rx_owner into rx_status routine.
From: Fabrice Gasnier <fabrice.gasnier@...com>
The RDES0 register can be read several times while doing RX of a
packet.
This patch slightly improves RX path performance by reading rdes0
once for two operation: check rx owner, get rx status bits.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@...com>
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 09291af..3ba268e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -238,10 +238,11 @@ struct stmmac_extra_stats {
/* Rx IPC status */
enum rx_frame_status {
- good_frame = 0,
- discard_frame = 1,
- csum_none = 2,
- llc_snap = 4,
+ good_frame = 0x0,
+ discard_frame = 0x1,
+ csum_none = 0x2,
+ llc_snap = 0x4,
+ dma_own = 0x8,
};
enum dma_irq_status {
@@ -356,7 +357,6 @@ struct stmmac_desc_ops {
/* Get the buffer size from the descriptor */
int (*get_tx_len) (struct dma_desc *p);
/* Handle extra events on specific interrupts hw dependent */
- int (*get_rx_owner) (struct dma_desc *p);
void (*set_rx_owner) (struct dma_desc *p);
/* Get the receive frame size */
int (*get_rx_frame_len) (struct dma_desc *p, int rx_coe_type);
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 716b807..1a2fce9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -186,6 +186,9 @@ static int enh_desc_get_rx_status(void *data, struct stmmac_extra_stats *x,
unsigned int rdes0 = p->des0;
int ret = good_frame;
+ if (unlikely(rdes0 & RDES0_OWN))
+ return dma_own;
+
if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR)) {
x->rx_desc++;
@@ -272,11 +275,6 @@ static int enh_desc_get_tx_owner(struct dma_desc *p)
return (p->des0 & ETDES0_OWN) >> 31;
}
-static int enh_desc_get_rx_owner(struct dma_desc *p)
-{
- return (p->des0 & RDES0_OWN) >> 31;
-}
-
static void enh_desc_set_tx_owner(struct dma_desc *p)
{
p->des0 |= ETDES0_OWN;
@@ -402,7 +400,6 @@ const struct stmmac_desc_ops enh_desc_ops = {
.init_rx_desc = enh_desc_init_rx_desc,
.init_tx_desc = enh_desc_init_tx_desc,
.get_tx_owner = enh_desc_get_tx_owner,
- .get_rx_owner = enh_desc_get_rx_owner,
.release_tx_desc = enh_desc_release_tx_desc,
.prepare_tx_desc = enh_desc_prepare_tx_desc,
.clear_tx_ic = enh_desc_clear_tx_ic,
diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index 460c573..5a91932 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -82,6 +82,9 @@ static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
unsigned int rdes0 = p->des0;
struct net_device_stats *stats = (struct net_device_stats *)data;
+ if (unlikely(rdes0 & RDES0_OWN))
+ return dma_own;
+
if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
pr_warn("%s: Oversized frame spanned multiple buffers\n",
__func__);
@@ -155,11 +158,6 @@ static int ndesc_get_tx_owner(struct dma_desc *p)
return (p->des0 & TDES0_OWN) >> 31;
}
-static int ndesc_get_rx_owner(struct dma_desc *p)
-{
- return (p->des0 & RDES0_OWN) >> 31;
-}
-
static void ndesc_set_tx_owner(struct dma_desc *p)
{
p->des0 |= TDES0_OWN;
@@ -277,7 +275,6 @@ const struct stmmac_desc_ops ndesc_ops = {
.init_rx_desc = ndesc_init_rx_desc,
.init_tx_desc = ndesc_init_tx_desc,
.get_tx_owner = ndesc_get_tx_owner,
- .get_rx_owner = ndesc_get_rx_owner,
.release_tx_desc = ndesc_release_tx_desc,
.prepare_tx_desc = ndesc_prepare_tx_desc,
.clear_tx_ic = ndesc_clear_tx_ic,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0194a8f..796d7c6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2205,7 +2205,11 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
else
p = priv->dma_rx + entry;
- if (priv->hw->desc->get_rx_owner(p))
+ /* read the status of the incoming frame */
+ status = priv->hw->desc->rx_status(&priv->dev->stats,
+ &priv->xstats, p);
+ /* check if managed by the DMA otherwise go ahead */
+ if (unlikely(status & dma_own))
break;
count++;
@@ -2218,9 +2222,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
else
prefetch(priv->dma_rx + next_entry);
- /* read the status of the incoming frame */
- status = priv->hw->desc->rx_status(&priv->dev->stats,
- &priv->xstats, p);
if ((priv->extend_desc) && (priv->hw->desc->rx_extended_status))
priv->hw->desc->rx_extended_status(&priv->dev->stats,
&priv->xstats,
--
1.9.1
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