mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
047695a029
This reverts commit 51397d7d95.
There are some unresolved random crashes on WRT1900AC v1 that still need
to be sorted out
Signed-off-by: Felix Fietkau <nbd@nbd.name>
279 lines
8.3 KiB
Diff
279 lines
8.3 KiB
Diff
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
Date: Wed, 9 Dec 2015 18:23:49 +0100
|
|
Subject: [PATCH] net: mvneta: Associate RX queues with each CPU
|
|
|
|
We enable the percpu interrupt for all the CPU and we just associate a
|
|
CPU to a few queue at the neta level. The mapping between the CPUs and
|
|
the queues is static. The queues are associated to the CPU module the
|
|
number of CPUs. However currently we only use on RX queue for a given
|
|
Ethernet port.
|
|
|
|
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
|
|
--- a/drivers/net/ethernet/marvell/mvneta.c
|
|
+++ b/drivers/net/ethernet/marvell/mvneta.c
|
|
@@ -110,9 +110,16 @@
|
|
#define MVNETA_CPU_MAP(cpu) (0x2540 + ((cpu) << 2))
|
|
#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_RXQ_TIME_COAL_REG(q) (0x2580 + ((q) << 2))
|
|
|
|
-/* Exception Interrupt Port/Queue Cause register */
|
|
+/* Exception Interrupt Port/Queue Cause register
|
|
+ *
|
|
+ * Their behavior depend of the mapping done using the PCPX2Q
|
|
+ * registers. For a given CPU if the bit associated to a queue is not
|
|
+ * set, then for the register a read from this CPU will always return
|
|
+ * 0 and a write won't do anything
|
|
+ */
|
|
|
|
#define MVNETA_INTR_NEW_CAUSE 0x25a0
|
|
#define MVNETA_INTR_NEW_MASK 0x25a4
|
|
@@ -820,7 +827,13 @@ static void mvneta_port_up(struct mvneta
|
|
mvreg_write(pp, MVNETA_TXQ_CMD, q_map);
|
|
|
|
/* Enable all initialized RXQs. */
|
|
- mvreg_write(pp, MVNETA_RXQ_CMD, BIT(pp->rxq_def));
|
|
+ for (queue = 0; queue < rxq_number; queue++) {
|
|
+ struct mvneta_rx_queue *rxq = &pp->rxqs[queue];
|
|
+
|
|
+ if (rxq->descs != NULL)
|
|
+ q_map |= (1 << queue);
|
|
+ }
|
|
+ mvreg_write(pp, MVNETA_RXQ_CMD, q_map);
|
|
}
|
|
|
|
/* Stop the Ethernet port activity */
|
|
@@ -1026,6 +1039,7 @@ static void mvneta_defaults_set(struct m
|
|
int cpu;
|
|
int queue;
|
|
u32 val;
|
|
+ int max_cpu = num_present_cpus();
|
|
|
|
/* Clear all Cause registers */
|
|
mvreg_write(pp, MVNETA_INTR_NEW_CAUSE, 0);
|
|
@@ -1041,13 +1055,23 @@ static void mvneta_defaults_set(struct m
|
|
/* Enable MBUS Retry bit16 */
|
|
mvreg_write(pp, MVNETA_MBUS_RETRY, 0x20);
|
|
|
|
- /* Set CPU queue access map - all CPUs have access to all RX
|
|
- * queues and to all TX queues
|
|
+ /* 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.
|
|
*/
|
|
- for_each_present_cpu(cpu)
|
|
- mvreg_write(pp, MVNETA_CPU_MAP(cpu),
|
|
- (MVNETA_CPU_RXQ_ACCESS_ALL_MASK |
|
|
- MVNETA_CPU_TXQ_ACCESS_ALL_MASK));
|
|
+ for_each_present_cpu(cpu) {
|
|
+ int rxq_map = 0, txq_map = 0;
|
|
+ int rxq;
|
|
+
|
|
+ for (rxq = 0; rxq < rxq_number; rxq++)
|
|
+ if ((rxq % max_cpu) == cpu)
|
|
+ rxq_map |= MVNETA_CPU_RXQ_ACCESS(rxq);
|
|
+
|
|
+ if (cpu == rxq_def)
|
|
+ txq_map = MVNETA_CPU_TXQ_ACCESS_ALL_MASK;
|
|
+
|
|
+ mvreg_write(pp, MVNETA_CPU_MAP(cpu), rxq_map | txq_map);
|
|
+ }
|
|
|
|
/* Reset RX and TX DMAs */
|
|
mvreg_write(pp, MVNETA_PORT_RX_RESET, MVNETA_PORT_RX_DMA_RESET);
|
|
@@ -2174,6 +2198,7 @@ static int mvneta_poll(struct napi_struc
|
|
{
|
|
int rx_done = 0;
|
|
u32 cause_rx_tx;
|
|
+ int rx_queue;
|
|
struct mvneta_port *pp = netdev_priv(napi->dev);
|
|
struct mvneta_pcpu_port *port = this_cpu_ptr(pp->ports);
|
|
|
|
@@ -2205,8 +2230,15 @@ static int mvneta_poll(struct napi_struc
|
|
/* For the case where the last mvneta_poll did not process all
|
|
* RX packets
|
|
*/
|
|
+ rx_queue = fls(((cause_rx_tx >> 8) & 0xff));
|
|
+
|
|
cause_rx_tx |= port->cause_rx_tx;
|
|
- rx_done = mvneta_rx(pp, budget, &pp->rxqs[pp->rxq_def]);
|
|
+
|
|
+ if (rx_queue) {
|
|
+ rx_queue = rx_queue - 1;
|
|
+ rx_done = mvneta_rx(pp, budget, &pp->rxqs[rx_queue]);
|
|
+ }
|
|
+
|
|
budget -= rx_done;
|
|
|
|
if (budget > 0) {
|
|
@@ -2419,19 +2451,27 @@ static void mvneta_cleanup_txqs(struct m
|
|
/* Cleanup all Rx queues */
|
|
static void mvneta_cleanup_rxqs(struct mvneta_port *pp)
|
|
{
|
|
- mvneta_rxq_deinit(pp, &pp->rxqs[pp->rxq_def]);
|
|
+ int queue;
|
|
+
|
|
+ for (queue = 0; queue < txq_number; queue++)
|
|
+ mvneta_rxq_deinit(pp, &pp->rxqs[queue]);
|
|
}
|
|
|
|
|
|
/* Init all Rx queues */
|
|
static int mvneta_setup_rxqs(struct mvneta_port *pp)
|
|
{
|
|
- int err = mvneta_rxq_init(pp, &pp->rxqs[pp->rxq_def]);
|
|
- if (err) {
|
|
- netdev_err(pp->dev, "%s: can't create rxq=%d\n",
|
|
- __func__, pp->rxq_def);
|
|
- mvneta_cleanup_rxqs(pp);
|
|
- return err;
|
|
+ int queue;
|
|
+
|
|
+ for (queue = 0; queue < rxq_number; queue++) {
|
|
+ int err = mvneta_rxq_init(pp, &pp->rxqs[queue]);
|
|
+
|
|
+ if (err) {
|
|
+ netdev_err(pp->dev, "%s: can't create rxq=%d\n",
|
|
+ __func__, queue);
|
|
+ mvneta_cleanup_rxqs(pp);
|
|
+ return err;
|
|
+ }
|
|
}
|
|
|
|
return 0;
|
|
@@ -2455,6 +2495,19 @@ static int mvneta_setup_txqs(struct mvne
|
|
return 0;
|
|
}
|
|
|
|
+static void mvneta_percpu_unmask_interrupt(void *arg)
|
|
+{
|
|
+ struct mvneta_port *pp = arg;
|
|
+
|
|
+ /* All the queue are unmasked, but actually only the ones
|
|
+ * maped to this CPU will be unmasked
|
|
+ */
|
|
+ mvreg_write(pp, MVNETA_INTR_NEW_MASK,
|
|
+ MVNETA_RX_INTR_MASK_ALL |
|
|
+ MVNETA_TX_INTR_MASK_ALL |
|
|
+ MVNETA_MISCINTR_INTR_MASK);
|
|
+}
|
|
+
|
|
static void mvneta_start_dev(struct mvneta_port *pp)
|
|
{
|
|
unsigned int cpu;
|
|
@@ -2472,11 +2525,10 @@ static void mvneta_start_dev(struct mvne
|
|
napi_enable(&port->napi);
|
|
}
|
|
|
|
- /* Unmask interrupts */
|
|
- mvreg_write(pp, MVNETA_INTR_NEW_MASK,
|
|
- MVNETA_RX_INTR_MASK(rxq_number) |
|
|
- MVNETA_TX_INTR_MASK(txq_number) |
|
|
- MVNETA_MISCINTR_INTR_MASK);
|
|
+ /* Unmask interrupts. It has to be done from each CPU */
|
|
+ for_each_online_cpu(cpu)
|
|
+ smp_call_function_single(cpu, mvneta_percpu_unmask_interrupt,
|
|
+ pp, true);
|
|
mvreg_write(pp, MVNETA_INTR_MISC_MASK,
|
|
MVNETA_CAUSE_PHY_STATUS_CHANGE |
|
|
MVNETA_CAUSE_LINK_CHANGE |
|
|
@@ -2752,22 +2804,35 @@ static void mvneta_percpu_disable(void *
|
|
|
|
static void mvneta_percpu_elect(struct mvneta_port *pp)
|
|
{
|
|
- int online_cpu_idx, cpu, i = 0;
|
|
+ int online_cpu_idx, max_cpu, cpu, i = 0;
|
|
|
|
online_cpu_idx = pp->rxq_def % num_online_cpus();
|
|
+ max_cpu = num_present_cpus();
|
|
|
|
for_each_online_cpu(cpu) {
|
|
- if (i == online_cpu_idx)
|
|
- /* Enable per-CPU interrupt on the one CPU we
|
|
- * just elected
|
|
+ int rxq_map = 0, txq_map = 0;
|
|
+ int rxq;
|
|
+
|
|
+ for (rxq = 0; rxq < rxq_number; rxq++)
|
|
+ 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
|
|
*/
|
|
- smp_call_function_single(cpu, mvneta_percpu_enable,
|
|
- pp, true);
|
|
- else
|
|
- /* Disable per-CPU interrupt on all the other CPU */
|
|
- smp_call_function_single(cpu, mvneta_percpu_disable,
|
|
- pp, true);
|
|
+ rxq_map |= MVNETA_CPU_RXQ_ACCESS(pp->rxq_def);
|
|
+ txq_map = 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
|
|
+ * new mapping
|
|
+ */
|
|
+ smp_call_function_single(cpu, mvneta_percpu_unmask_interrupt,
|
|
+ pp, true);
|
|
i++;
|
|
+
|
|
}
|
|
};
|
|
|
|
@@ -2802,12 +2867,22 @@ static int mvneta_percpu_notifier(struct
|
|
mvreg_write(pp, MVNETA_INTR_MISC_MASK, 0);
|
|
napi_enable(&port->napi);
|
|
|
|
+
|
|
+ /* Enable per-CPU interrupts on the CPU that is
|
|
+ * brought up.
|
|
+ */
|
|
+ smp_call_function_single(cpu, mvneta_percpu_enable,
|
|
+ pp, true);
|
|
+
|
|
/* Enable per-CPU interrupt on the one CPU we care
|
|
* about.
|
|
*/
|
|
mvneta_percpu_elect(pp);
|
|
|
|
- /* Unmask all ethernet port interrupts */
|
|
+ /* Unmask all ethernet port interrupts, as this
|
|
+ * notifier is called for each CPU then the CPU to
|
|
+ * Queue mapping is applied
|
|
+ */
|
|
mvreg_write(pp, MVNETA_INTR_NEW_MASK,
|
|
MVNETA_RX_INTR_MASK(rxq_number) |
|
|
MVNETA_TX_INTR_MASK(txq_number) |
|
|
@@ -2858,7 +2933,7 @@ static int mvneta_percpu_notifier(struct
|
|
static int mvneta_open(struct net_device *dev)
|
|
{
|
|
struct mvneta_port *pp = netdev_priv(dev);
|
|
- int ret;
|
|
+ int ret, cpu;
|
|
|
|
pp->pkt_size = MVNETA_RX_PKT_SIZE(pp->dev->mtu);
|
|
pp->frag_size = SKB_DATA_ALIGN(MVNETA_RX_BUF_SIZE(pp->pkt_size)) +
|
|
@@ -2888,8 +2963,13 @@ static int mvneta_open(struct net_device
|
|
*/
|
|
mvneta_percpu_disable(pp);
|
|
|
|
- /* Elect a CPU to handle our RX queue interrupt */
|
|
- mvneta_percpu_elect(pp);
|
|
+ /* Enable per-CPU interrupt on all the CPU to handle our RX
|
|
+ * queue interrupts
|
|
+ */
|
|
+ for_each_online_cpu(cpu)
|
|
+ smp_call_function_single(cpu, mvneta_percpu_enable,
|
|
+ pp, true);
|
|
+
|
|
|
|
/* Register a CPU notifier to handle the case where our CPU
|
|
* might be taken offline.
|