diff options
| author | Divy Le Ray <divy@chelsio.com> | 2009-03-12 21:14:09 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-13 11:30:45 -0700 |
| commit | fc88219601aa3f94def89433a6afde154e8faa8c (patch) | |
| tree | 8c921807f947ba25c7ce188c9ec586aa57b0a0f9 /drivers/net/cxgb3/t3_hw.c | |
| parent | 42c8ea17e8f78752ed5a354791b0ea1697dc3480 (diff) | |
| download | blackbird-obmc-linux-fc88219601aa3f94def89433a6afde154e8faa8c.tar.gz blackbird-obmc-linux-fc88219601aa3f94def89433a6afde154e8faa8c.zip | |
cxgb3: disable high freq non-data interrupts
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>
Diffstat (limited to 'drivers/net/cxgb3/t3_hw.c')
| -rw-r--r-- | drivers/net/cxgb3/t3_hw.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/net/cxgb3/t3_hw.c b/drivers/net/cxgb3/t3_hw.c index ac2a974dfe37..7c6ee0c9b6fc 100644 --- a/drivers/net/cxgb3/t3_hw.c +++ b/drivers/net/cxgb3/t3_hw.c @@ -1323,7 +1323,7 @@ static int t3_handle_intr_status(struct adapter *adapter, unsigned int reg, #define MC7_INTR_MASK (F_AE | F_UE | F_CE | V_PE(M_PE)) #define XGM_INTR_MASK (V_TXFIFO_PRTY_ERR(M_TXFIFO_PRTY_ERR) | \ V_RXFIFO_PRTY_ERR(M_RXFIFO_PRTY_ERR) | \ - F_TXFIFO_UNDERRUN | F_RXFIFO_OVERFLOW) + F_TXFIFO_UNDERRUN) #define PCIX_INTR_MASK (F_MSTDETPARERR | F_SIGTARABT | F_RCVTARABT | \ F_RCVMSTABT | F_SIGSYSERR | F_DETPARERR | \ F_SPLCMPDIS | F_UNXSPLCMP | F_RCVSPLCMPERR | \ @@ -1695,7 +1695,14 @@ static void mc7_intr_handler(struct mc7 *mc7) static int mac_intr_handler(struct adapter *adap, unsigned int idx) { struct cmac *mac = &adap2pinfo(adap, idx)->mac; - u32 cause = t3_read_reg(adap, A_XGM_INT_CAUSE + mac->offset); + /* + * We mask out interrupt causes for which we're not taking interrupts. + * This allows us to use polling logic to monitor some of the other + * conditions when taking interrupts would impose too much load on the + * system. + */ + u32 cause = t3_read_reg(adap, A_XGM_INT_CAUSE + mac->offset) & + ~F_RXFIFO_OVERFLOW; if (cause & V_TXFIFO_PRTY_ERR(M_TXFIFO_PRTY_ERR)) { mac->stats.tx_fifo_parity_err++; @@ -3617,7 +3624,15 @@ int t3_prep_adapter(struct adapter *adapter, const struct adapter_info *ai, adapter->params.info = ai; adapter->params.nports = ai->nports; adapter->params.rev = t3_read_reg(adapter, A_PL_REV); - adapter->params.linkpoll_period = 0; + /* + * We used to only run the "adapter check task" once a second if + * we had PHYs which didn't support interrupts (we would check + * their link status once a second). Now we check other conditions + * in that routine which could potentially impose a very high + * interrupt load on the system. As such, we now always scan the + * adapter state once a second ... + */ + adapter->params.linkpoll_period = 10; adapter->params.stats_update_period = is_10G(adapter) ? MAC_STATS_ACCUM_SECS : (MAC_STATS_ACCUM_SECS * 10); adapter->params.pci.vpd_cap_addr = @@ -3707,7 +3722,14 @@ int t3_prep_adapter(struct adapter *adapter, const struct adapter_info *ai, ETH_ALEN); init_link_config(&p->link_config, p->phy.caps); p->phy.ops->power_down(&p->phy, 1); - if (!(p->phy.caps & SUPPORTED_IRQ)) + + /* + * If the PHY doesn't support interrupts for link status + * changes, schedule a scan of the adapter links at least + * once a second. + */ + if (!(p->phy.caps & SUPPORTED_IRQ) && + adapter->params.linkpoll_period > 10) adapter->params.linkpoll_period = 10; } |
