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net: dsa: remove out_drop label in taggers rcv 

Many rcv functions from net/dsa/tag_*.c have a useless out_drop goto
label which simply returns NULL. Kill it in favor of the obvious.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Vivien Didelot 2017-06-01 16:07:14 -04:00 committed by David S. Miller
parent 717ffbfb28
commit 5470979585
6 changed files with 24 additions and 42 deletions
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11
net/dsa/tag_brcm.c
View File

@ -104,27 +104,27 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
ds = dst->cpu_dp->ds;
if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
goto out_drop;
return NULL;
/* skb->data points to the EtherType, the tag is right before it */
brcm_tag = skb->data - 2;
/* The opcode should never be different than 0b000 */
if (unlikely((brcm_tag[0] >> BRCM_OPCODE_SHIFT) & BRCM_OPCODE_MASK))
goto out_drop;
return NULL;
/* We should never see a reserved reason code without knowing how to
* handle it
*/
if (unlikely(brcm_tag[2] & BRCM_EG_RC_RSVD))
goto out_drop;
return NULL;
/* Locate which port this is coming from */
source_port = brcm_tag[3] & BRCM_EG_PID_MASK;
/* Validate port against switch setup, either the port is totally */
if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
goto out_drop;
return NULL;
/* Remove Broadcom tag and update checksum */
skb_pull_rcsum(skb, BRCM_TAG_LEN);
@ -137,9 +137,6 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
skb->dev = ds->ports[source_port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops brcm_netdev_ops = {

13
net/dsa/tag_dsa.c
View File

@ -79,7 +79,7 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev,
int source_port;
if (unlikely(!pskb_may_pull(skb, DSA_HLEN)))
goto out_drop;
return NULL;
/*
* The ethertype field is part of the DSA header.
@ -90,7 +90,7 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev,
* Check that frame type is either TO_CPU or FORWARD.
*/
if ((dsa_header[0] & 0xc0) != 0x00 && (dsa_header[0] & 0xc0) != 0xc0)
goto out_drop;
return NULL;
/*
* Determine source device and port.
@ -103,14 +103,14 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev,
* port is a registered DSA port.
*/
if (source_device >= DSA_MAX_SWITCHES)
goto out_drop;
return NULL;
ds = dst->ds[source_device];
if (!ds)
goto out_drop;
return NULL;
if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
goto out_drop;
return NULL;
/*
* Convert the DSA header to an 802.1q header if the 'tagged'
@ -161,9 +161,6 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev,
skb->dev = ds->ports[source_port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops dsa_netdev_ops = {

13
net/dsa/tag_edsa.c
View File

@ -92,7 +92,7 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
int source_port;
if (unlikely(!pskb_may_pull(skb, EDSA_HLEN)))
goto out_drop;
return NULL;
/*
* Skip the two null bytes after the ethertype.
@ -103,7 +103,7 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
* Check that frame type is either TO_CPU or FORWARD.
*/
if ((edsa_header[0] & 0xc0) != 0x00 && (edsa_header[0] & 0xc0) != 0xc0)
goto out_drop;
return NULL;
/*
* Determine source device and port.
@ -116,14 +116,14 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
* port is a registered DSA port.
*/
if (source_device >= DSA_MAX_SWITCHES)
goto out_drop;
return NULL;
ds = dst->ds[source_device];
if (!ds)
goto out_drop;
return NULL;
if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
goto out_drop;
return NULL;
/*
* If the 'tagged' bit is set, convert the DSA tag to a 802.1q
@ -180,9 +180,6 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
skb->dev = ds->ports[source_port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops edsa_netdev_ops = {

9
net/dsa/tag_mtk.c
View File

@ -57,7 +57,7 @@ static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
__be16 *phdr, hdr;
if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN)))
goto out_drop;
return NULL;
/* The MTK header is added by the switch between src addr
* and ethertype at this point, skb->data points to 2 bytes
@ -79,19 +79,16 @@ static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
*/
ds = dst->ds[0];
if (!ds)
goto out_drop;
return NULL;
/* Get source port information */
port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
if (!ds->ports[port].netdev)
goto out_drop;
return NULL;
skb->dev = ds->ports[port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops mtk_netdev_ops = {

11
net/dsa/tag_qca.c
View File

@ -77,7 +77,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
__be16 *phdr, hdr;
if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
goto out_drop;
return NULL;
/* The QCA header is added by the switch between src addr and Ethertype
* At this point, skb->data points to ethertype so header should be
@ -89,7 +89,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
/* Make sure the version is correct */
ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
if (unlikely(ver != QCA_HDR_VERSION))
goto out_drop;
return NULL;
/* Remove QCA tag and recalculate checksum */
skb_pull_rcsum(skb, QCA_HDR_LEN);
@ -101,20 +101,17 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
*/
ds = dst->cpu_dp->ds;
if (!ds)
goto out_drop;
return NULL;
/* Get source port information */
port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
if (!ds->ports[port].netdev)
goto out_drop;
return NULL;
/* Update skb & forward the frame accordingly */
skb->dev = ds->ports[port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops qca_netdev_ops = {

9
net/dsa/tag_trailer.c
View File

@ -70,25 +70,22 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
ds = dst->cpu_dp->ds;
if (skb_linearize(skb))
goto out_drop;
return NULL;
trailer = skb_tail_pointer(skb) - 4;
if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
(trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
goto out_drop;
return NULL;
source_port = trailer[1] & 7;
if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
goto out_drop;
return NULL;
pskb_trim_rcsum(skb, skb->len - 4);
skb->dev = ds->ports[source_port].netdev;
return skb;
out_drop:
return NULL;
}
const struct dsa_device_ops trailer_netdev_ops = {