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net: mvpp2: Use relaxed I/O in data path 

Use relaxed I/O on the hot path. This achieves significant performance
improvements. On a 10G link, this makes a basic iperf TCP test go from
an average of 4.5 Gbits/sec to about 9.40 Gbits/sec.

Signed-off-by: Yan Markman <ymarkman@marvell.com>
[Maxime: Commit message, cosmetic changes]
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yan Markman 2018-03-27 16:49:05 +02:00 committed by David S. Miller
parent 5f75a1863e
commit cdcfeb0fb4
1 changed files with 30 additions and 13 deletions
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43
drivers/net/ethernet/marvell/mvpp2.c
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@ -1359,6 +1359,10 @@ static u32 mvpp2_read(struct mvpp2 *priv, u32 offset)
return readl(priv->swth_base[0] + offset);
}
static u32 mvpp2_read_relaxed(struct mvpp2 *priv, u32 offset)
{
return readl_relaxed(priv->swth_base[0] + offset);
}
/* These accessors should be used to access:
*
* - per-CPU registers, where each CPU has its own copy of the
@ -1407,6 +1411,18 @@ static u32 mvpp2_percpu_read(struct mvpp2 *priv, int cpu,
return readl(priv->swth_base[cpu] + offset);
}
static void mvpp2_percpu_write_relaxed(struct mvpp2 *priv, int cpu,
u32 offset, u32 data)
{
writel_relaxed(data, priv->swth_base[cpu] + offset);
}
static u32 mvpp2_percpu_read_relaxed(struct mvpp2 *priv, int cpu,
u32 offset)
{
return readl_relaxed(priv->swth_base[cpu] + offset);
}
static dma_addr_t mvpp2_txdesc_dma_addr_get(struct mvpp2_port *port,
struct mvpp2_tx_desc *tx_desc)
{
@ -4442,8 +4458,8 @@ static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
<< MVPP22_BM_ADDR_HIGH_VIRT_RLS_SHIFT) &
MVPP22_BM_ADDR_HIGH_VIRT_RLS_MASK;
mvpp2_percpu_write(port->priv, cpu,
MVPP22_BM_ADDR_HIGH_RLS_REG, val);
mvpp2_percpu_write_relaxed(port->priv, cpu,
MVPP22_BM_ADDR_HIGH_RLS_REG, val);
}
/* MVPP2_BM_VIRT_RLS_REG is not interpreted by HW, and simply
@ -4451,10 +4467,10 @@ static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
* descriptor. Instead of storing the virtual address, we
* store the physical address
*/
mvpp2_percpu_write(port->priv, cpu,
MVPP2_BM_VIRT_RLS_REG, buf_phys_addr);
mvpp2_percpu_write(port->priv, cpu,
MVPP2_BM_PHY_RLS_REG(pool), buf_dma_addr);
mvpp2_percpu_write_relaxed(port->priv, cpu,
MVPP2_BM_VIRT_RLS_REG, buf_phys_addr);
mvpp2_percpu_write_relaxed(port->priv, cpu,
MVPP2_BM_PHY_RLS_REG(pool), buf_dma_addr);
put_cpu();
}
@ -5546,7 +5562,8 @@ static int mvpp2_aggr_desc_num_check(struct mvpp2 *priv,
if ((aggr_txq->count + num) > MVPP2_AGGR_TXQ_SIZE) {
/* Update number of occupied aggregated Tx descriptors */
int cpu = smp_processor_id();
u32 val = mvpp2_read(priv, MVPP2_AGGR_TXQ_STATUS_REG(cpu));
u32 val = mvpp2_read_relaxed(priv,
MVPP2_AGGR_TXQ_STATUS_REG(cpu));
aggr_txq->count = val & MVPP2_AGGR_TXQ_PENDING_MASK;
}
@ -5570,9 +5587,9 @@ static int mvpp2_txq_alloc_reserved_desc(struct mvpp2 *priv,
int cpu = smp_processor_id();
val = (txq->id << MVPP2_TXQ_RSVD_REQ_Q_OFFSET) | num;
mvpp2_percpu_write(priv, cpu, MVPP2_TXQ_RSVD_REQ_REG, val);
mvpp2_percpu_write_relaxed(priv, cpu, MVPP2_TXQ_RSVD_REQ_REG, val);
val = mvpp2_percpu_read(priv, cpu, MVPP2_TXQ_RSVD_RSLT_REG);
val = mvpp2_percpu_read_relaxed(priv, cpu, MVPP2_TXQ_RSVD_RSLT_REG);
return val & MVPP2_TXQ_RSVD_RSLT_MASK;
}
@ -5677,8 +5694,8 @@ static inline int mvpp2_txq_sent_desc_proc(struct mvpp2_port *port,
u32 val;
/* Reading status reg resets transmitted descriptor counter */
val = mvpp2_percpu_read(port->priv, smp_processor_id(),
MVPP2_TXQ_SENT_REG(txq->id));
val = mvpp2_percpu_read_relaxed(port->priv, smp_processor_id(),
MVPP2_TXQ_SENT_REG(txq->id));
return (val & MVPP2_TRANSMITTED_COUNT_MASK) >>
MVPP2_TRANSMITTED_COUNT_OFFSET;
@ -7044,8 +7061,8 @@ static int mvpp2_poll(struct napi_struct *napi, int budget)
*
* Each CPU has its own Rx/Tx cause register
*/
cause_rx_tx = mvpp2_percpu_read(port->priv, qv->sw_thread_id,
MVPP2_ISR_RX_TX_CAUSE_REG(port->id));
cause_rx_tx = mvpp2_percpu_read_relaxed(port->priv, qv->sw_thread_id,
MVPP2_ISR_RX_TX_CAUSE_REG(port->id));
cause_misc = cause_rx_tx & MVPP2_CAUSE_MISC_SUM_MASK;
if (cause_misc) {