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net: dsa: tag_sja1105: absorb entire sja1105_vlan_rcv() into dsa_8021q_rcv()

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tag_sja1105 has a wrapper over dsa_8021q_rcv(): sja1105_vlan_rcv(),
which determines whether the packet came from a bridge with
vlan_filtering=1 (the case resolved via
dsa_find_designated_bridge_port_by_vid()), or if it contains a tag_8021q
header.

Looking at a new tagger implementation for vsc73xx, based also on
tag_8021q, it is becoming clear that the logic is needed there as well.
So instead of forcing each tagger to wrap around dsa_8021q_rcv(), let's
merge the logic into the core.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Tested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Link: https://patch.msgid.link/20240713211620.1125910-5-paweldembicki@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2024-07-13 23:16:10 +02:00 committed by Jakub Kicinski
parent dcfe767378
commit 0064b863ab
4 changed files with 34 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
net/dsa/tag_8021q.c
View File

@ -507,27 +507,48 @@ EXPORT_SYMBOL_GPL(dsa_tag_8021q_find_port_by_vbid);
* @vbid: pointer to storage for imprecise bridge ID. Must be pre-initialized
* with -1. If a positive value is returned, the source_port and switch_id
* are invalid.
* @vid: pointer to storage for original VID, in case tag_8021q decoding failed.
*
* If the packet has a tag_8021q header, decode it and set @source_port,
* @switch_id and @vbid, and strip the header. Otherwise set @vid and keep the
* header in the hwaccel area of the packet.
*/
void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id,
int *vbid)
int *vbid, int *vid)
{
int tmp_source_port, tmp_switch_id, tmp_vbid;
u16 vid, tci;
__be16 vlan_proto;
u16 tmp_vid, tci;
if (skb_vlan_tag_present(skb)) {
vlan_proto = skb->vlan_proto;
tci = skb_vlan_tag_get(skb);
__vlan_hwaccel_clear_tag(skb);
} else {
struct vlan_ethhdr *hdr = vlan_eth_hdr(skb);
vlan_proto = hdr->h_vlan_proto;
skb_push_rcsum(skb, ETH_HLEN);
__skb_vlan_pop(skb, &tci);
skb_pull_rcsum(skb, ETH_HLEN);
}
vid = tci & VLAN_VID_MASK;
tmp_vid = tci & VLAN_VID_MASK;
if (!vid_is_dsa_8021q(tmp_vid)) {
/* Not a tag_8021q frame, so return the VID to the
* caller for further processing, and put the tag back
*/
if (vid)
*vid = tmp_vid;
tmp_source_port = dsa_8021q_rx_source_port(vid);
tmp_switch_id = dsa_8021q_rx_switch_id(vid);
tmp_vbid = dsa_tag_8021q_rx_vbid(vid);
__vlan_hwaccel_put_tag(skb, vlan_proto, tci);
return;
}
tmp_source_port = dsa_8021q_rx_source_port(tmp_vid);
tmp_switch_id = dsa_8021q_rx_switch_id(tmp_vid);
tmp_vbid = dsa_tag_8021q_rx_vbid(tmp_vid);
/* Precise source port information is unknown when receiving from a
* VLAN-unaware bridging domain, and tmp_source_port and tmp_switch_id
@ -546,5 +567,6 @@ void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id,
*vbid = tmp_vbid;
skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
return;
}
EXPORT_SYMBOL_GPL(dsa_8021q_rcv);

2
net/dsa/tag_8021q.h
View File

@ -14,7 +14,7 @@ struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
u16 tpid, u16 tci);
void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id,
int *vbid);
int *vbid, int *vid);
struct net_device *dsa_tag_8021q_find_port_by_vbid(struct net_device *conduit,
int vbid);

2
net/dsa/tag_ocelot_8021q.c
View File

@ -81,7 +81,7 @@ static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
{
int src_port, switch_id;
dsa_8021q_rcv(skb, &src_port, &switch_id, NULL);
dsa_8021q_rcv(skb, &src_port, &switch_id, NULL, NULL);
skb->dev = dsa_conduit_find_user(netdev, switch_id, src_port);
if (!skb->dev)

32
net/dsa/tag_sja1105.c
View File

@ -472,37 +472,14 @@ static bool sja1110_skb_has_inband_control_extension(const struct sk_buff *skb)
return ntohs(eth_hdr(skb)->h_proto) == ETH_P_SJA1110;
}
/* If the VLAN in the packet is a tag_8021q one, set @source_port and
* @switch_id and strip the header. Otherwise set @vid and keep it in the
* packet.
*/
static void sja1105_vlan_rcv(struct sk_buff *skb, int *source_port,
int *switch_id, int *vbid, u16 *vid)
{
struct vlan_ethhdr *hdr = vlan_eth_hdr(skb);
u16 vlan_tci;
if (skb_vlan_tag_present(skb))
vlan_tci = skb_vlan_tag_get(skb);
else
vlan_tci = ntohs(hdr->h_vlan_TCI);
if (vid_is_dsa_8021q(vlan_tci & VLAN_VID_MASK))
return dsa_8021q_rcv(skb, source_port, switch_id, vbid);
/* Try our best with imprecise RX */
*vid = vlan_tci & VLAN_VID_MASK;
}
static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
struct net_device *netdev)
{
int source_port = -1, switch_id = -1, vbid = -1;
int source_port = -1, switch_id = -1, vbid = -1, vid = -1;
struct sja1105_meta meta = {0};
struct ethhdr *hdr;
bool is_link_local;
bool is_meta;
u16 vid;
hdr = eth_hdr(skb);
is_link_local = sja1105_is_link_local(skb);
@ -525,7 +502,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
* a tag_8021q VLAN which we have to strip
*/
if (sja1105_skb_has_tag_8021q(skb))
sja1105_vlan_rcv(skb, &source_port, &switch_id, &vbid, &vid);
dsa_8021q_rcv(skb, &source_port, &switch_id, &vbid, &vid);
else if (source_port == -1 && switch_id == -1)
/* Packets with no source information have no chance of
* getting accepted, drop them straight away.
@ -660,9 +637,8 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
static struct sk_buff *sja1110_rcv(struct sk_buff *skb,
struct net_device *netdev)
{
int source_port = -1, switch_id = -1, vbid = -1;
int source_port = -1, switch_id = -1, vbid = -1, vid = -1;
bool host_only = false;
u16 vid = 0;
if (sja1110_skb_has_inband_control_extension(skb)) {
skb = sja1110_rcv_inband_control_extension(skb, &source_port,
@ -674,7 +650,7 @@ static struct sk_buff *sja1110_rcv(struct sk_buff *skb,
/* Packets with in-band control extensions might still have RX VLANs */
if (likely(sja1105_skb_has_tag_8021q(skb)))
sja1105_vlan_rcv(skb, &source_port, &switch_id, &vbid, &vid);
dsa_8021q_rcv(skb, &source_port, &switch_id, &vbid, &vid);
if (vbid >= 1)
skb->dev = dsa_tag_8021q_find_port_by_vbid(netdev, vbid);