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Merge branch 'dsa-lan9303-IGMP-handling' 

Egil Hjelmeland says:

====================
net: dsa: lan9303: IGMP handling

Set up the HW switch to trap IGMP packets to CPU port.
And make sure skb->offload_fwd_mark is cleared for incoming IGMP packets.

skb->offload_fwd_mark calculation is a candidate for consolidation into the
DSA core. The calculation can probably be more polished when done at a point
where DSA has updated skb.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-11-11 21:50:15 +09:00
parent 940c9c4588 4672cd3605
commit f444ef5103
2 changed files with 39 additions and 0 deletions
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26
drivers/net/dsa/lan9303-core.c
View File

@ -153,6 +153,8 @@
# define LAN9303_SWE_VLAN_UNTAG_PORT0 BIT(12)
#define LAN9303_SWE_VLAN_CMD_STS 0x1810
#define LAN9303_SWE_GLB_INGRESS_CFG 0x1840
# define LAN9303_SWE_GLB_INGR_IGMP_TRAP BIT(7)
# define LAN9303_SWE_GLB_INGR_IGMP_PORT(p) BIT(10 + p)
#define LAN9303_SWE_PORT_STATE 0x1843
# define LAN9303_SWE_PORT_STATE_FORWARDING_PORT2 (0)
# define LAN9303_SWE_PORT_STATE_LEARNING_PORT2 BIT(5)
@ -450,6 +452,21 @@ static int lan9303_read_switch_reg(struct lan9303 *chip, u16 regnum, u32 *val)
return ret;
}
static int lan9303_write_switch_reg_mask(struct lan9303 *chip, u16 regnum,
u32 val, u32 mask)
{
int ret;
u32 reg;
ret = lan9303_read_switch_reg(chip, regnum, &reg);
if (ret)
return ret;
reg = (reg & ~mask) | val;
return lan9303_write_switch_reg(chip, regnum, reg);
}
static int lan9303_write_switch_port(struct lan9303 *chip, int port,
u16 regnum, u32 val)
{
@ -905,6 +922,15 @@ static int lan9303_setup(struct dsa_switch *ds)
if (ret)
dev_err(chip->dev, "failed to re-enable switching %d\n", ret);
/* Trap IGMP to port 0 */
ret = lan9303_write_switch_reg_mask(chip, LAN9303_SWE_GLB_INGRESS_CFG,
LAN9303_SWE_GLB_INGR_IGMP_TRAP |
LAN9303_SWE_GLB_INGR_IGMP_PORT(0),
LAN9303_SWE_GLB_INGR_IGMP_PORT(1) |
LAN9303_SWE_GLB_INGR_IGMP_PORT(2));
if (ret)
dev_err(chip->dev, "failed to setup IGMP trap %d\n", ret);
return 0;
}

13
net/dsa/tag_lan9303.c
View File

@ -92,6 +92,8 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
{
u16 *lan9303_tag;
unsigned int source_port;
u16 ether_type_nw;
u8 ip_protocol;
if (unlikely(!pskb_may_pull(skb, LAN9303_TAG_LEN))) {
dev_warn_ratelimited(&dev->dev,
@ -129,6 +131,17 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
skb->offload_fwd_mark = !ether_addr_equal(skb->data - ETH_HLEN,
eth_stp_addr);
/* We also need IGMP packets to have skb->offload_fwd_mark = 0.
* Solving this for all conceivable situations would add more cost to
* every packet. Instead we handle just the common case:
* No VLAN tag + Ethernet II framing.
* Test least probable term first.
*/
ether_type_nw = lan9303_tag[2];
ip_protocol = *(skb->data + 9);
if (ip_protocol == IPPROTO_IGMP && ether_type_nw == htons(ETH_P_IP))
skb->offload_fwd_mark = 0;
return skb;
}