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sfc: replace asynchronous filter operations

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Instead of having an efx->type->filter_rfs_insert() method, just use
 workitems with a worker function that calls efx->type->filter_insert().
The only user of this is efx_filter_rfs(), which now queues a call to
 efx_filter_rfs_work().
Similarly, efx_filter_rfs_expire() is now a worker function called on a
 new channel->filter_work work_struct, so the method
 efx->type->filter_rfs_expire_one() is no longer called in atomic context.
 We also add a new mutex efx->rps_mutex to protect the RPS state (efx->
 rps_expire_channel, efx->rps_expire_index, and channel->rps_flow_id) so
 that the taking of efx->filter_lock can be moved to
 efx->type->filter_rfs_expire_one().
Thus, all filter table functions are now called in a sleepable context,
 allowing them to use sleeping locks in a future patch.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree
2018-03-27 17:41:59 +01:00
committed by David S. Miller
parent c709002c23
commit 3af0f34290
8 changed files with 124 additions and 208 deletions
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15
drivers/net/ethernet/sfc/efx.c
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@@ -340,7 +340,10 @@ static int efx_poll(struct napi_struct *napi, int budget)
efx_update_irq_mod(efx, channel);
}
efx_filter_rfs_expire(channel);
#ifdef CONFIG_RFS_ACCEL
/* Perhaps expire some ARFS filters */
schedule_work(&channel->filter_work);
#endif
/* There is no race here; although napi_disable() will
* only wait for napi_complete(), this isn't a problem
@@ -470,6 +473,10 @@ efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
tx_queue->channel = channel;
}
#ifdef CONFIG_RFS_ACCEL
INIT_WORK(&channel->filter_work, efx_filter_rfs_expire);
#endif
rx_queue = &channel->rx_queue;
rx_queue->efx = efx;
timer_setup(&rx_queue->slow_fill, efx_rx_slow_fill, 0);
@@ -512,6 +519,9 @@ efx_copy_channel(const struct efx_channel *old_channel)
rx_queue->buffer = NULL;
memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
timer_setup(&rx_queue->slow_fill, efx_rx_slow_fill, 0);
#ifdef CONFIG_RFS_ACCEL
INIT_WORK(&channel->filter_work, efx_filter_rfs_expire);
#endif
return channel;
}
@@ -3012,6 +3022,9 @@ static int efx_init_struct(struct efx_nic *efx,
efx->num_mac_stats = MC_CMD_MAC_NSTATS;
BUILD_BUG_ON(MC_CMD_MAC_NSTATS - 1 != MC_CMD_MAC_GENERATION_END);
mutex_init(&efx->mac_lock);
#ifdef CONFIG_RFS_ACCEL
mutex_init(&efx->rps_mutex);
#endif
efx->phy_op = &efx_dummy_phy_operations;
efx->mdio.dev = net_dev;
INIT_WORK(&efx->mac_work, efx_mac_work);