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sfc: Cleanup Falcon-arch simple MAC filter state

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On Falcon we implement MAC filtering requested by the stack using the
MAC wrapper's single unicast filter and multicast hash filter.  Siena
is very similar, though MAC configuration is mediated by the MC.

Since MCDI operations may sleep, reconfiguration is deferred from
ndo_set_rx_mode to a work item.  However, it still updates the private
variables describing the filter state synchronously.  Contrary to
comments, the later use of these variables is not protected using the
address lock, resulting in race conditions.

Move the state update to a new function
efx_farch_filter_sync_rx_mode() and make the Falcon-arch MAC
configuration functions call that, so that its use is consistently
serialised by the mac_lock.

Invert and rename the promiscuous flag to the more accurate
unicast_filter, and comment that both this and multicast_hash are
not used on EF10.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings
2012-11-19 23:08:22 +00:00
parent f5253d9256
commit 964e61355e
7 changed files with 52 additions and 44 deletions
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6
drivers/net/ethernet/sfc/falcon.c
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@@ -764,7 +764,7 @@ static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
FRF_AB_XM_RXEN, 1,
FRF_AB_XM_AUTO_DEPAD, 0,
FRF_AB_XM_ACPT_ALL_MCAST, 1,
FRF_AB_XM_ACPT_ALL_UCAST, efx->promiscuous,
FRF_AB_XM_ACPT_ALL_UCAST, !efx->unicast_filter,
FRF_AB_XM_PASS_CRC_ERR, 1);
efx_writeo(efx, &reg, FR_AB_XM_RX_CFG);
@@ -864,6 +864,8 @@ static int falcon_reconfigure_xmac(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
efx_farch_filter_sync_rx_mode(efx);
falcon_reconfigure_xgxs_core(efx);
falcon_reconfigure_xmac_core(efx);
@@ -1081,7 +1083,7 @@ static void falcon_reconfigure_mac_wrapper(struct efx_nic *efx)
EFX_POPULATE_OWORD_5(reg,
FRF_AB_MAC_XOFF_VAL, 0xffff /* max pause time */,
FRF_AB_MAC_BCAD_ACPT, 1,
FRF_AB_MAC_UC_PROM, efx->promiscuous,
FRF_AB_MAC_UC_PROM, !efx->unicast_filter,
FRF_AB_MAC_LINK_STATUS, 1, /* always set */
FRF_AB_MAC_SPEED, link_speed);
/* On B0, MAC backpressure can be disabled and packets get