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net: bcmgenet: use promisc for unsupported filters

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[ Upstream commit 35cbef9863 ]

Currently we silently ignore filters if we cannot meet the filter
requirements. This will lead to the MAC dropping packets that are
expected to pass. A better solution would be to set the NIC to promisc
mode when the required filters cannot be met.

Also correct the number of MDF filters supported. It should be 17,
not 16.

Signed-off-by: Justin Chen <justinpopo6@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Justin Chen
2019-07-17 14:58:53 -07:00
committed by Chris
parent d4befb2c84
commit f1aebbb002
1 changed files with 26 additions and 31 deletions
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57
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@@ -3002,39 +3002,42 @@ static void bcmgenet_timeout(struct net_device *dev)
netif_tx_wake_all_queues(dev);
}
#define MAX_MC_COUNT 16
#define MAX_MDF_FILTER 17
static inline void bcmgenet_set_mdf_addr(struct bcmgenet_priv *priv,
unsigned char *addr,
int *i,
int *mc)
int *i)
{
u32 reg;
bcmgenet_umac_writel(priv, addr[0] << 8 | addr[1],
UMAC_MDF_ADDR + (*i * 4));
bcmgenet_umac_writel(priv, addr[2] << 24 | addr[3] << 16 |
addr[4] << 8 | addr[5],
UMAC_MDF_ADDR + ((*i + 1) * 4));
reg = bcmgenet_umac_readl(priv, UMAC_MDF_CTRL);
reg |= (1 << (MAX_MC_COUNT - *mc));
bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
*i += 2;
(*mc)++;
}
static void bcmgenet_set_rx_mode(struct net_device *dev)
{
struct bcmgenet_priv *priv = netdev_priv(dev);
struct netdev_hw_addr *ha;
int i, mc;
int i, nfilter;
u32 reg;
netif_dbg(priv, hw, dev, "%s: %08X\n", __func__, dev->flags);
/* Promiscuous mode */
/* Number of filters needed */
nfilter = netdev_uc_count(dev) + netdev_mc_count(dev) + 2;
/*
* Turn on promicuous mode for three scenarios
* 1. IFF_PROMISC flag is set
* 2. IFF_ALLMULTI flag is set
* 3. The number of filters needed exceeds the number filters
* supported by the hardware.
*/
reg = bcmgenet_umac_readl(priv, UMAC_CMD);
if (dev->flags & IFF_PROMISC) {
if ((dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) ||
(nfilter > MAX_MDF_FILTER)) {
reg |= CMD_PROMISC;
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
@@ -3044,32 +3047,24 @@ static void bcmgenet_set_rx_mode(struct net_device *dev)
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
}
/* UniMac doesn't support ALLMULTI */
if (dev->flags & IFF_ALLMULTI) {
netdev_warn(dev, "ALLMULTI is not supported\n");
return;
}
/* update MDF filter */
i = 0;
mc = 0;
/* Broadcast */
bcmgenet_set_mdf_addr(priv, dev->broadcast, &i, &mc);
bcmgenet_set_mdf_addr(priv, dev->broadcast, &i);
/* my own address.*/
bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i, &mc);
/* Unicast list*/
if (netdev_uc_count(dev) > (MAX_MC_COUNT - mc))
return;
bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i);
/* Unicast */
netdev_for_each_uc_addr(ha, dev)
bcmgenet_set_mdf_addr(priv, ha->addr, &i);
if (!netdev_uc_empty(dev))
netdev_for_each_uc_addr(ha, dev)
bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
/* Multicast */
if (netdev_mc_empty(dev) || netdev_mc_count(dev) >= (MAX_MC_COUNT - mc))
return;
netdev_for_each_mc_addr(ha, dev)
bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
bcmgenet_set_mdf_addr(priv, ha->addr, &i);
/* Enable filters */
reg = GENMASK(MAX_MDF_FILTER - 1, MAX_MDF_FILTER - nfilter);
bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
}
/* Set the hardware MAC address. */