sfc: Rework efx_set_multicast_hash()

When !port_enabled, defer the write to reconfigure_mac_wrapper.

Whilst here, simplify the logic now that efx_start_port() always calls
efx_reconfigure_port().

From: Steve Hodgson <shodgson@solarflare.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index d593086..0d47d6f 100644 (file)
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -560,6 +560,12 @@ void __efx_reconfigure_port(struct efx_nic *efx)
        EFX_LOG(efx, "reconfiguring MAC from PHY settings on CPU %d\n",
                raw_smp_processor_id());
 
+       /* Serialise the promiscuous flag with efx_set_multicast_list. */
+       if (efx_dev_registered(efx)) {
+               netif_addr_lock_bh(efx->net_dev);
+               netif_addr_unlock_bh(efx->net_dev);
+       }
+
        falcon_reconfigure_xmac(efx);
 
        /* Inform kernel of loss/gain of carrier */
@@ -1410,26 +1416,19 @@ static int efx_set_mac_address(struct net_device *net_dev, void *data)
        return 0;
 }
 
-/* Context: netif_tx_lock held, BHs disabled. */
+/* Context: netif_addr_lock held, BHs disabled. */
 static void efx_set_multicast_list(struct net_device *net_dev)
 {
        struct efx_nic *efx = netdev_priv(net_dev);
        struct dev_mc_list *mc_list = net_dev->mc_list;
        union efx_multicast_hash *mc_hash = &efx->multicast_hash;
-       bool promiscuous;
+       bool promiscuous = !!(net_dev->flags & IFF_PROMISC);
+       bool changed = (efx->promiscuous != promiscuous);
        u32 crc;
        int bit;
        int i;
 
-       /* Set per-MAC promiscuity flag and reconfigure MAC if necessary */
-       promiscuous = !!(net_dev->flags & IFF_PROMISC);
-       if (efx->promiscuous != promiscuous) {
-               efx->promiscuous = promiscuous;
-               /* Close the window between efx_stop_port() and efx_flush_all()
-                * by only queuing work when the port is enabled. */
-               if (efx->port_enabled)
-                       queue_work(efx->workqueue, &efx->reconfigure_work);
-       }
+       efx->promiscuous = promiscuous;
 
        /* Build multicast hash table */
        if (promiscuous || (net_dev->flags & IFF_ALLMULTI)) {
@@ -1444,6 +1443,13 @@ static void efx_set_multicast_list(struct net_device *net_dev)
                }
        }
 
+       if (!efx->port_enabled)
+               /* Delay pushing settings until efx_start_port() */
+               return;
+
+       if (changed)
+               queue_work(efx->workqueue, &efx->reconfigure_work);
+
        /* Create and activate new global multicast hash table */
        falcon_set_multicast_hash(efx);
 }