diff options
| author | Egil Hjelmeland <privat@egil-hjelmeland.no> | 2017-11-13 16:25:25 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-14 15:47:48 +0300 |
| commit | 1a48fbd9ec1483f5bf3da63dfd907f4272828b4a (patch) | |
| tree | 91fcdda5b562ab89b05746e407407fe935861171 /net | |
| parent | 887c3820a3801a117a494aeca147ec52f95e1566 (diff) | |
| download | linux-1a48fbd9ec1483f5bf3da63dfd907f4272828b4a.tar.xz | |
net: dsa: lan9303: calculate offload_fwd_mark from tag
The lan9303 set bits in the host CPU tag indicating if a ingress frame
is a trapped IGMP or STP frame. Use these bits to calculate
skb->offload_fwd_mark more efficiently.
Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dsa/tag_lan9303.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c index b8c5e52b2eff..548c00254c07 100644 --- a/net/dsa/tag_lan9303.c +++ b/net/dsa/tag_lan9303.c @@ -42,6 +42,10 @@ #define LAN9303_TAG_LEN 4 # define LAN9303_TAG_TX_USE_ALR BIT(3) # define LAN9303_TAG_TX_STP_OVERRIDE BIT(4) +# define LAN9303_TAG_RX_IGMP BIT(3) +# define LAN9303_TAG_RX_STP BIT(4) +# define LAN9303_TAG_RX_TRAPPED_TO_CPU (LAN9303_TAG_RX_IGMP | \ + LAN9303_TAG_RX_STP) /* Decide whether to transmit using ALR lookup, or transmit directly to * port using tag. ALR learning is performed only when using ALR lookup. @@ -91,9 +95,8 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) { u16 *lan9303_tag; + u16 lan9303_tag1; 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, @@ -114,7 +117,8 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev, return NULL; } - source_port = ntohs(lan9303_tag[1]) & 0x3; + lan9303_tag1 = ntohs(lan9303_tag[1]); + source_port = lan9303_tag1 & 0x3; skb->dev = dsa_master_find_slave(dev, 0, source_port); if (!skb->dev) { @@ -128,19 +132,7 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev, skb_pull_rcsum(skb, 2 + 2); memmove(skb->data - ETH_HLEN, skb->data - (ETH_HLEN + LAN9303_TAG_LEN), 2 * ETH_ALEN); - 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; + skb->offload_fwd_mark = !(lan9303_tag1 & LAN9303_TAG_RX_TRAPPED_TO_CPU); return skb; } |