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cxgb3: disable high freq non-data interrupts

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Under RX pressure, The HW might generate a high load of interrupts
to signal mac fifo or free lists overflow.
Disable the interrupts, and poll the relevant status bits
to maintain stats.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Divy Le Ray
2009-03-12 21:14:09 +00:00
committed by David S. Miller
parent 42c8ea17e8
commit fc88219601
4 changed files with 86 additions and 5 deletions
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50
drivers/net/cxgb3/cxgb3_main.c
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@@ -2471,6 +2471,8 @@ static void t3_adap_check_task(struct work_struct *work)
struct adapter *adapter = container_of(work, struct adapter,
adap_check_task.work);
const struct adapter_params *p = &adapter->params;
int port;
unsigned int v, status, reset;
adapter->check_task_cnt++;
@@ -2489,6 +2491,54 @@ static void t3_adap_check_task(struct work_struct *work)
if (p->rev == T3_REV_B2)
check_t3b2_mac(adapter);
/*
* Scan the XGMAC's to check for various conditions which we want to
* monitor in a periodic polling manner rather than via an interrupt
* condition. This is used for conditions which would otherwise flood
* the system with interrupts and we only really need to know that the
* conditions are "happening" ... For each condition we count the
* detection of the condition and reset it for the next polling loop.
*/
for_each_port(adapter, port) {
struct cmac *mac = &adap2pinfo(adapter, port)->mac;
u32 cause;
cause = t3_read_reg(adapter, A_XGM_INT_CAUSE + mac->offset);
reset = 0;
if (cause & F_RXFIFO_OVERFLOW) {
mac->stats.rx_fifo_ovfl++;
reset |= F_RXFIFO_OVERFLOW;
}
t3_write_reg(adapter, A_XGM_INT_CAUSE + mac->offset, reset);
}
/*
* We do the same as above for FL_EMPTY interrupts.
*/
status = t3_read_reg(adapter, A_SG_INT_CAUSE);
reset = 0;
if (status & F_FLEMPTY) {
struct sge_qset *qs = &adapter->sge.qs[0];
int i = 0;
reset |= F_FLEMPTY;
v = (t3_read_reg(adapter, A_SG_RSPQ_FL_STATUS) >> S_FL0EMPTY) &
0xffff;
while (v) {
qs->fl[i].empty += (v & 1);
if (i)
qs++;
i ^= 1;
v >>= 1;
}
}
t3_write_reg(adapter, A_SG_INT_CAUSE, reset);
/* Schedule the next check update if any port is active. */
spin_lock_irq(&adapter->work_lock);
if (adapter->open_device_map & PORT_MASK)