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authorVladimir Oltean2021-08-10 16:13:53 +0300
committerDavid S. Miller2021-08-11 14:44:58 +0100
commitf1dacd7aea34333620bd5177a8808a3296a63184 (patch)
tree273cc438c8f33fc92fc42757b8b10eff1c82bd74 /net/dsa
parent1a8e628c8a3e38af1392197adf086de7ce51d24f (diff)
net: dsa: create a helper that strips EtherType DSA headers on RX
All header taggers open-code a memmove that is fairly not all that obvious, and we can hide the details behind a helper function, since the only thing specific to the driver is the length of the header tag. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/dsa_priv.h26
-rw-r--r--net/dsa/tag_brcm.c10
-rw-r--r--net/dsa/tag_dsa.c8
-rw-r--r--net/dsa/tag_lan9303.c5
-rw-r--r--net/dsa/tag_mtk.c4
-rw-r--r--net/dsa/tag_qca.c3
-rw-r--r--net/dsa/tag_rtl4_a.c5
-rw-r--r--net/dsa/tag_sja1105.c4
8 files changed, 37 insertions, 28 deletions
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 9575cabd3ec3..8a12ec1f9d21 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -452,6 +452,32 @@ static inline void dsa_default_offload_fwd_mark(struct sk_buff *skb)
skb->offload_fwd_mark = !!(dp->bridge_dev);
}
+/* Helper for removing DSA header tags from packets in the RX path.
+ * Must not be called before skb_pull(len).
+ * skb->data
+ * |
+ * v
+ * | | | | | | | | | | | | | | | | | | |
+ * +-----------------------+-----------------------+---------------+-------+
+ * | Destination MAC | Source MAC | DSA header | EType |
+ * +-----------------------+-----------------------+---------------+-------+
+ * | |
+ * <----- len -----> <----- len ----->
+ * |
+ * >>>>>>> v
+ * >>>>>>> | | | | | | | | | | | | | | |
+ * >>>>>>> +-----------------------+-----------------------+-------+
+ * >>>>>>> | Destination MAC | Source MAC | EType |
+ * +-----------------------+-----------------------+-------+
+ * ^
+ * |
+ * skb->data
+ */
+static inline void dsa_strip_etype_header(struct sk_buff *skb, int len)
+{
+ memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - len, 2 * ETH_ALEN);
+}
+
/* switch.c */
int dsa_switch_register_notifier(struct dsa_switch *ds);
void dsa_switch_unregister_notifier(struct dsa_switch *ds);
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 96e93b544a0d..2fc546b31ad8 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -190,10 +190,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev)
if (!nskb)
return nskb;
- /* Move the Ethernet DA and SA */
- memmove(nskb->data - ETH_HLEN,
- nskb->data - ETH_HLEN - BRCM_TAG_LEN,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, BRCM_TAG_LEN);
return nskb;
}
@@ -270,10 +267,7 @@ static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb,
dsa_default_offload_fwd_mark(skb);
- /* Move the Ethernet DA and SA */
- memmove(skb->data - ETH_HLEN,
- skb->data - ETH_HLEN - BRCM_LEG_TAG_LEN,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, BRCM_LEG_TAG_LEN);
return skb;
}
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index e32f8160e895..ad9c841c998f 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -312,14 +312,10 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev,
memcpy(dsa_header, new_header, DSA_HLEN);
if (extra)
- memmove(skb->data - ETH_HLEN,
- skb->data - ETH_HLEN - extra,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, extra);
} else {
skb_pull_rcsum(skb, DSA_HLEN);
- memmove(skb->data - ETH_HLEN,
- skb->data - ETH_HLEN - DSA_HLEN - extra,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, DSA_HLEN + extra);
}
return skb;
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 58d3a0e712d2..af13c0a9cb41 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -112,8 +112,9 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev)
* and the current ethertype field.
*/
skb_pull_rcsum(skb, 2 + 2);
- memmove(skb->data - ETH_HLEN, skb->data - (ETH_HLEN + LAN9303_TAG_LEN),
- 2 * ETH_ALEN);
+
+ dsa_strip_etype_header(skb, LAN9303_TAG_LEN);
+
if (!(lan9303_tag1 & LAN9303_TAG_RX_TRAPPED_TO_CPU))
dsa_default_offload_fwd_mark(skb);
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index bbf37c031d44..6a78e9f146e5 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -80,9 +80,7 @@ static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev)
/* Remove MTK tag and recalculate checksum. */
skb_pull_rcsum(skb, MTK_HDR_LEN);
- memmove(skb->data - ETH_HLEN,
- skb->data - ETH_HLEN - MTK_HDR_LEN,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, MTK_HDR_LEN);
/* Get source port information */
port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 6e3136990491..f9fc881da591 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -72,8 +72,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
/* Remove QCA tag and recalculate checksum */
skb_pull_rcsum(skb, QCA_HDR_LEN);
- memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
- ETH_HLEN - QCA_HDR_LEN);
+ dsa_strip_etype_header(skb, QCA_HDR_LEN);
/* Get source port information */
port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
diff --git a/net/dsa/tag_rtl4_a.c b/net/dsa/tag_rtl4_a.c
index aaddca3c0245..ff8707ff0c5b 100644
--- a/net/dsa/tag_rtl4_a.c
+++ b/net/dsa/tag_rtl4_a.c
@@ -108,10 +108,7 @@ static struct sk_buff *rtl4a_tag_rcv(struct sk_buff *skb,
/* Remove RTL4 tag and recalculate checksum */
skb_pull_rcsum(skb, RTL4_A_HDR_LEN);
- /* Move ethernet DA and SA in front of the data */
- memmove(skb->data - ETH_HLEN,
- skb->data - ETH_HLEN - RTL4_A_HDR_LEN,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, RTL4_A_HDR_LEN);
dsa_default_offload_fwd_mark(skb);
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index 38b2792f971d..33fbd3d025e7 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -532,9 +532,7 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
/* Advance skb->data past the DSA header */
skb_pull_rcsum(skb, SJA1110_HEADER_LEN);
- /* Remove the DSA header */
- memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - SJA1110_HEADER_LEN,
- 2 * ETH_ALEN);
+ dsa_strip_etype_header(skb, SJA1110_HEADER_LEN);
/* With skb->data in its final place, update the MAC header
* so that eth_hdr() continues to works properly.