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sfc: Make queue flushes more reliable

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Increase the potential retry count for RX flushes from 5 to 100.

Stop polling the RX_DESC_PTR_TBL to infer that a flush might have
happened. Instead absolutely rely on the flush events, unless bug 7803
applies (Falcon rev A only).

To keep things quick, request flushes for every TX and RX queue up
front, and match up the events to requests.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings
2008-09-01 12:49:37 +01:00
committed by Jeff Garzik
parent 92ade881b2
commit 6bc5d3a933
4 changed files with 141 additions and 126 deletions
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15
drivers/net/sfc/efx.c
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@@ -445,10 +445,17 @@ static void efx_fini_channels(struct efx_nic *efx)
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
int rc;
EFX_ASSERT_RESET_SERIALISED(efx);
BUG_ON(efx->port_enabled);
rc = falcon_flush_queues(efx);
if (rc)
EFX_ERR(efx, "failed to flush queues\n");
else
EFX_LOG(efx, "successfully flushed all queues\n");
efx_for_each_channel(channel, efx) {
EFX_LOG(channel->efx, "shut down chan %d\n", channel->channel);
@@ -456,13 +463,6 @@ static void efx_fini_channels(struct efx_nic *efx)
efx_fini_rx_queue(rx_queue);
efx_for_each_channel_tx_queue(tx_queue, channel)
efx_fini_tx_queue(tx_queue);
}
/* Do the event queues last so that we can handle flush events
* for all DMA queues. */
efx_for_each_channel(channel, efx) {
EFX_LOG(channel->efx, "shut down evq %d\n", channel->channel);
efx_fini_eventq(channel);
}
}
@@ -1092,7 +1092,6 @@ static void efx_stop_all(struct efx_nic *efx)
/* Isolate the MAC from the TX and RX engines, so that queue
* flushes will complete in a timely fashion. */
falcon_deconfigure_mac_wrapper(efx);
falcon_drain_tx_fifo(efx);
/* Stop the kernel transmit interface late, so the watchdog