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sfc: Simplify XMAC link polling

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From: Steve Hodgson <shodgson@solarflare.com>

Only the XMAC on Falcon needs help from the driver to poll and reset
the MAC-PHY link (XAUI); GMII is a simple parallel bus and on later
NICs firmware takes care of the XAUI link.  Also, an XMAC interrupt
currently schedules a work item which simply clears a flag
(efx_nic::mac_up) to be checked by the regular monitor (or the next
link reconfiguration, if that is sooner).

Rename the flag to xmac_poll_required, changing its sense.  Remove the
needless indirection and just set the flag immediately.  Call
falcon_xmac_poll() directly where required.

Add a new generic operation mac_op::check_fault to check the link
outside of regular monitoring, as required during self-tests.

(Note that this leaves us with an unused work item, but we will
immediately have another use for it.)

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2009-11-25 16:12:01 +00:00 committed by David S. Miller
parent fe75820b99
commit 9007b9fa36
8 changed files with 41 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/sfc/efx.c
View File

@ -693,8 +693,6 @@ static void efx_mac_work(struct work_struct *data)
struct efx_nic *efx = container_of(data, struct efx_nic, mac_work);
mutex_lock(&efx->mac_lock);
if (efx->port_enabled)
efx->mac_op->irq(efx);
mutex_unlock(&efx->mac_lock);
}
@ -774,7 +772,6 @@ static void efx_start_port(struct efx_nic *efx)
mutex_lock(&efx->mac_lock);
efx->port_enabled = true;
__efx_reconfigure_port(efx);
efx->mac_op->irq(efx);
mutex_unlock(&efx->mac_lock);
}
@ -1903,8 +1900,6 @@ void efx_port_dummy_op_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
static struct efx_mac_operations efx_dummy_mac_operations = {
.reconfigure = efx_port_dummy_op_void,
.poll = efx_port_dummy_op_void,
.irq = efx_port_dummy_op_void,
};
static struct efx_phy_operations efx_dummy_phy_operations = {

7
drivers/net/sfc/falcon.c
View File

@ -900,7 +900,7 @@ static void falcon_handle_global_event(struct efx_channel *channel,
if ((falcon_rev(efx) >= FALCON_REV_B0) &&
EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_XG_MGT_INTR)) {
queue_work(efx->workqueue, &efx->mac_work);
efx->xmac_poll_required = true;
handled = true;
}
@ -2251,7 +2251,7 @@ int falcon_switch_mac(struct efx_nic *efx)
EFX_LOG(efx, "selected %cMAC\n", EFX_IS10G(efx) ? 'X' : 'G');
/* Not all macs support a mac-level link state */
efx->mac_up = true;
efx->xmac_poll_required = false;
rc = falcon_reset_macs(efx);
out:
@ -2624,7 +2624,8 @@ void falcon_monitor(struct efx_nic *efx)
falcon_sim_phy_event(efx);
}
efx->phy_op->poll(efx);
efx->mac_op->poll(efx);
if (EFX_IS10G(efx))
falcon_poll_xmac(efx);
}
/* Zeroes out the SRAM contents. This routine must be called in

2
drivers/net/sfc/falcon.h
View File

@ -209,4 +209,6 @@ extern int falcon_test_registers(struct efx_nic *efx);
extern void falcon_generate_event(struct efx_channel *channel,
efx_qword_t *event);
extern void falcon_poll_xmac(struct efx_nic *efx);
#endif /* EFX_FALCON_H */

4
drivers/net/sfc/falcon_boards.c
View File

@ -380,7 +380,7 @@ static int sfe4001_check_hw(struct efx_nic *efx)
s32 status;
/* If XAUI link is up then do not monitor */
if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
if (EFX_WORKAROUND_7884(efx) && !efx->xmac_poll_required)
return 0;
/* Check the powered status of the PHY. Lack of power implies that
@ -468,7 +468,7 @@ static int sfn4111t_check_hw(struct efx_nic *efx)
s32 status;
/* If XAUI link is up then do not monitor */
if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
if (EFX_WORKAROUND_7884(efx) && !efx->xmac_poll_required)
return 0;
/* Test LHIGH, RHIGH, FAULT, EOT and IOT alarms */

8
drivers/net/sfc/falcon_gmac.c
View File

@ -216,9 +216,13 @@ static void falcon_update_stats_gmac(struct efx_nic *efx)
mac_stats->rx_lt64 = mac_stats->rx_good_lt64 + mac_stats->rx_bad_lt64;
}
static bool falcon_gmac_check_fault(struct efx_nic *efx)
{
return false;
}
struct efx_mac_operations falcon_gmac_operations = {
.reconfigure = falcon_reconfigure_gmac,
.update_stats = falcon_update_stats_gmac,
.irq = efx_port_dummy_op_void,
.poll = efx_port_dummy_op_void,
.check_fault = falcon_gmac_check_fault,
};

50
drivers/net/sfc/falcon_xmac.c
View File

@ -98,7 +98,7 @@ static void falcon_mask_status_intr(struct efx_nic *efx, bool enable)
/* We can only use this interrupt to signal the negative edge of
* xaui_align [we have to poll the positive edge]. */
if (!efx->mac_up)
if (efx->xmac_poll_required)
return;
/* Flush the ISR */
@ -243,29 +243,35 @@ static void falcon_reconfigure_xgxs_core(struct efx_nic *efx)
}
/* Try and bring the Falcon side of the Falcon-Phy XAUI link fails
* to come back up. Bash it until it comes back up */
static void falcon_check_xaui_link_up(struct efx_nic *efx, int tries)
/* Try to bring up the Falcon side of the Falcon-Phy XAUI link */
static bool falcon_check_xaui_link_up(struct efx_nic *efx, int tries)
{
efx->mac_up = falcon_xaui_link_ok(efx);
bool mac_up = falcon_xaui_link_ok(efx);
if ((efx->loopback_mode == LOOPBACK_NETWORK) ||
efx_phy_mode_disabled(efx->phy_mode))
/* XAUI link is expected to be down */
return;
return mac_up;
falcon_stop_nic_stats(efx);
while (!efx->mac_up && tries) {
while (!mac_up && tries) {
EFX_LOG(efx, "bashing xaui\n");
falcon_reset_xaui(efx);
udelay(200);
efx->mac_up = falcon_xaui_link_ok(efx);
mac_up = falcon_xaui_link_ok(efx);
--tries;
}
falcon_start_nic_stats(efx);
return mac_up;
}
static bool falcon_xmac_check_fault(struct efx_nic *efx)
{
return !falcon_check_xaui_link_up(efx, 5);
}
static void falcon_reconfigure_xmac(struct efx_nic *efx)
@ -277,7 +283,7 @@ static void falcon_reconfigure_xmac(struct efx_nic *efx)
falcon_reconfigure_mac_wrapper(efx);
falcon_check_xaui_link_up(efx, 5);
efx->xmac_poll_required = !falcon_check_xaui_link_up(efx, 5);
falcon_mask_status_intr(efx, true);
}
@ -341,35 +347,19 @@ static void falcon_update_stats_xmac(struct efx_nic *efx)
mac_stats->rx_control * 64);
}
static void falcon_xmac_irq(struct efx_nic *efx)
void falcon_poll_xmac(struct efx_nic *efx)
{
/* The XGMII link has a transient fault, which indicates either:
* - there's a transient xgmii fault
* - falcon's end of the xaui link may need a kick
* - the wire-side link may have gone down, but the lasi/poll()
* hasn't noticed yet.
*
* We only want to even bother polling XAUI if we're confident it's
* not (1) or (3). In both cases, the only reliable way to spot this
* is to wait a bit. We do this here by forcing the mac link state
* to down, and waiting for the mac poll to come round and check
*/
efx->mac_up = false;
}
static void falcon_poll_xmac(struct efx_nic *efx)
{
if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up || efx->mac_up)
if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up ||
!efx->xmac_poll_required)
return;
falcon_mask_status_intr(efx, false);
falcon_check_xaui_link_up(efx, 1);
efx->xmac_poll_required = !falcon_check_xaui_link_up(efx, 1);
falcon_mask_status_intr(efx, true);
}
struct efx_mac_operations falcon_xmac_operations = {
.reconfigure = falcon_reconfigure_xmac,
.update_stats = falcon_update_stats_xmac,
.irq = falcon_xmac_irq,
.poll = falcon_poll_xmac,
.check_fault = falcon_xmac_check_fault,
};

10
drivers/net/sfc/net_driver.h
View File

@ -507,14 +507,12 @@ struct efx_link_state {
* struct efx_mac_operations - Efx MAC operations table
* @reconfigure: Reconfigure MAC. Serialised by the mac_lock
* @update_stats: Update statistics
* @irq: Hardware MAC event callback. Serialised by the mac_lock
* @poll: Poll for hardware state. Serialised by the mac_lock
* @check_fault: Check fault state. True if fault present.
*/
struct efx_mac_operations {
void (*reconfigure) (struct efx_nic *efx);
void (*update_stats) (struct efx_nic *efx);
void (*irq) (struct efx_nic *efx);
void (*poll) (struct efx_nic *efx);
bool (*check_fault)(struct efx_nic *efx);
};
/**
@ -725,7 +723,7 @@ union efx_multicast_hash {
* @phy_data: PHY private data (including PHY-specific stats)
* @mdio: PHY MDIO interface
* @phy_mode: PHY operating mode. Serialised by @mac_lock.
* @mac_up: MAC link state
* @xmac_poll_required: XMAC link state needs polling
* @link_state: Current state of the link
* @n_link_state_changes: Number of times the link has changed state
* @promiscuous: Promiscuous flag. Protected by netif_tx_lock.
@ -810,7 +808,7 @@ struct efx_nic {
struct mdio_if_info mdio;
enum efx_phy_mode phy_mode;
bool mac_up;
bool xmac_poll_required;
struct efx_link_state link_state;
unsigned int n_link_state_changes;

9
drivers/net/sfc/selftest.c
View File

@ -610,13 +610,10 @@ static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
flush_workqueue(efx->workqueue);
rmb();
/* We need both the phy and xaui links to be ok.
* rather than relying on the falcon_xmac irq/poll
* regime, just poll xaui directly */
/* We need both the PHY and MAC-PHY links to be OK */
link_up = efx->link_state.up;
if (link_up && EFX_IS10G(efx) &&
!falcon_xaui_link_ok(efx))
link_up = false;
if (link_up)
link_up = !efx->mac_op->check_fault(efx);
} while ((++count < 20) && !link_up);