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net: mvneta: Configure XPS support 

With this patch each CPU is associated with its own set of TX queues.

It also setup the XPS with an initial configuration which set the
affinity matching the hardware configuration.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gregory CLEMENT 2015-12-09 18:23:51 +01:00 committed by David S. Miller
parent 9a401dead0
commit 50bf8cb6fc
1 changed files with 45 additions and 11 deletions
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56
drivers/net/ethernet/marvell/mvneta.c
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@ -111,6 +111,7 @@
#define MVNETA_CPU_RXQ_ACCESS_ALL_MASK 0x000000ff
#define MVNETA_CPU_TXQ_ACCESS_ALL_MASK 0x0000ff00
#define MVNETA_CPU_RXQ_ACCESS(rxq) BIT(rxq)
#define MVNETA_CPU_TXQ_ACCESS(txq) BIT(txq + 8)
#define MVNETA_RXQ_TIME_COAL_REG(q) (0x2580 + ((q) << 2))
/* Exception Interrupt Port/Queue Cause register
@ -514,6 +515,9 @@ struct mvneta_tx_queue {
/* DMA address of TSO headers */
dma_addr_t tso_hdrs_phys;
/* Affinity mask for CPUs*/
cpumask_t affinity_mask;
};
struct mvneta_rx_queue {
@ -1062,20 +1066,30 @@ static void mvneta_defaults_set(struct mvneta_port *pp)
/* Enable MBUS Retry bit16 */
mvreg_write(pp, MVNETA_MBUS_RETRY, 0x20);
/* Set CPU queue access map. CPUs are assigned to the RX
* queues modulo their number and all the TX queues are
* assigned to the CPU associated to the default RX queue.
/* Set CPU queue access map. CPUs are assigned to the RX and
* TX queues modulo their number. If there is only one TX
* queue then it is assigned to the CPU associated to the
* default RX queue.
*/
for_each_present_cpu(cpu) {
int rxq_map = 0, txq_map = 0;
int rxq;
int rxq, txq;
for (rxq = 0; rxq < rxq_number; rxq++)
if ((rxq % max_cpu) == cpu)
rxq_map |= MVNETA_CPU_RXQ_ACCESS(rxq);
if (cpu == pp->rxq_def)
txq_map = MVNETA_CPU_TXQ_ACCESS_ALL_MASK;
for (txq = 0; txq < txq_number; txq++)
if ((txq % max_cpu) == cpu)
txq_map |= MVNETA_CPU_TXQ_ACCESS(txq);
/* With only one TX queue we configure a special case
* which will allow to get all the irq on a single
* CPU
*/
if (txq_number == 1)
txq_map = (cpu == pp->rxq_def) ?
MVNETA_CPU_TXQ_ACCESS(1) : 0;
mvreg_write(pp, MVNETA_CPU_MAP(cpu), rxq_map | txq_map);
}
@ -2362,6 +2376,8 @@ static void mvneta_rxq_deinit(struct mvneta_port *pp,
static int mvneta_txq_init(struct mvneta_port *pp,
struct mvneta_tx_queue *txq)
{
int cpu;
txq->size = pp->tx_ring_size;
/* A queue must always have room for at least one skb.
@ -2414,6 +2430,14 @@ static int mvneta_txq_init(struct mvneta_port *pp,
}
mvneta_tx_done_pkts_coal_set(pp, txq, txq->done_pkts_coal);
/* Setup XPS mapping */
if (txq_number > 1)
cpu = txq->id % num_present_cpus();
else
cpu = pp->rxq_def % num_present_cpus();
cpumask_set_cpu(cpu, &txq->affinity_mask);
netif_set_xps_queue(pp->dev, &txq->affinity_mask, txq->id);
return 0;
}
@ -2836,13 +2860,23 @@ static void mvneta_percpu_elect(struct mvneta_port *pp)
if ((rxq % max_cpu) == cpu)
rxq_map |= MVNETA_CPU_RXQ_ACCESS(rxq);
if (i == online_cpu_idx) {
/* Map the default receive queue and transmit
* queue to the elected CPU
if (i == online_cpu_idx)
/* Map the default receive queue queue to the
* elected CPU
*/
rxq_map |= MVNETA_CPU_RXQ_ACCESS(pp->rxq_def);
txq_map = MVNETA_CPU_TXQ_ACCESS_ALL_MASK;
}
/* We update the TX queue map only if we have one
* queue. In this case we associate the TX queue to
* the CPU bound to the default RX queue
*/
if (txq_number == 1)
txq_map = (i == online_cpu_idx) ?
MVNETA_CPU_TXQ_ACCESS(1) : 0;
else
txq_map = mvreg_read(pp, MVNETA_CPU_MAP(cpu)) &
MVNETA_CPU_TXQ_ACCESS_ALL_MASK;
mvreg_write(pp, MVNETA_CPU_MAP(cpu), rxq_map | txq_map);
/* Update the interrupt mask on each CPU according the