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net: dsa: tag_sja1105: be dsa_loop-safe

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Add support for tag_sja1105 running on non-sja1105 DSA ports, by making
sure that every time we dereference dp->priv, we check the switch's
dsa_switch_ops (otherwise we access a struct sja1105_port structure that
is in fact something else).

This adds an unconditional build-time dependency between sja1105 being
built as module => tag_sja1105 must also be built as module. This was
there only for PTP before.

Some sane defaults must also take place when not running on sja1105
hardware. These are:

- sja1105_xmit_tpid: the sja1105 driver uses different VLAN protocols
  depending on VLAN awareness and switch revision (when an encapsulated
  VLAN must be sent). Default to 0x8100.

- sja1105_rcv_meta_state_machine: this aggregates PTP frames with their
  metadata timestamp frames. When running on non-sja1105 hardware, don't
  do that and accept all frames unmodified.

- sja1105_defer_xmit: calls sja1105_port_deferred_xmit in sja1105_main.c
  which writes a management route over SPI. When not running on sja1105
  hardware, bypass the SPI write and send the frame as-is.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2021-08-17 17:58:47 +03:00 committed by David S. Miller
parent 93e271632c
commit 994d2cbb08
4 changed files with 48 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/dsa/sja1105/sja1105_main.c
View File

@ -28,8 +28,6 @@
#define SJA1105_UNKNOWN_MULTICAST 0x010000000000ull
#define SJA1105_DEFAULT_VLAN (VLAN_N_VID - 1)
static const struct dsa_switch_ops sja1105_switch_ops;
static void sja1105_hw_reset(struct gpio_desc *gpio, unsigned int pulse_len,
unsigned int startup_delay)
{
@ -3100,7 +3098,7 @@ static void sja1105_teardown(struct dsa_switch *ds)
sja1105_static_config_free(&priv->static_config);
}
static const struct dsa_switch_ops sja1105_switch_ops = {
const struct dsa_switch_ops sja1105_switch_ops = {
.get_tag_protocol = sja1105_get_tag_protocol,
.setup = sja1105_setup,
.teardown = sja1105_teardown,
@ -3149,6 +3147,7 @@ static const struct dsa_switch_ops sja1105_switch_ops = {
.port_bridge_tx_fwd_offload = dsa_tag_8021q_bridge_tx_fwd_offload,
.port_bridge_tx_fwd_unoffload = dsa_tag_8021q_bridge_tx_fwd_unoffload,
};
EXPORT_SYMBOL_GPL(sja1105_switch_ops);
static const struct of_device_id sja1105_dt_ids[];

18
include/linux/dsa/sja1105.h
View File

@ -88,4 +88,22 @@ static inline void sja1110_process_meta_tstamp(struct dsa_switch *ds, int port,
#endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */
#if IS_ENABLED(CONFIG_NET_DSA_SJA1105)
extern const struct dsa_switch_ops sja1105_switch_ops;
static inline bool dsa_port_is_sja1105(struct dsa_port *dp)
{
return dp->ds->ops == &sja1105_switch_ops;
}
#else
static inline bool dsa_port_is_sja1105(struct dsa_port *dp)
{
return false;
}
#endif
#endif /* _NET_DSA_SJA1105_H */

2
net/dsa/Kconfig
View File

@ -138,7 +138,7 @@ config NET_DSA_TAG_LAN9303
config NET_DSA_TAG_SJA1105
tristate "Tag driver for NXP SJA1105 switches"
depends on (NET_DSA_SJA1105 && NET_DSA_SJA1105_PTP) || !NET_DSA_SJA1105 || !NET_DSA_SJA1105_PTP
depends on NET_DSA_SJA1105 || !NET_DSA_SJA1105
select PACKING
help
Say Y or M if you want to enable support for tagging frames with the

39
net/dsa/tag_sja1105.c
View File

@ -116,9 +116,14 @@ static inline bool sja1105_is_meta_frame(const struct sk_buff *skb)
}
/* Calls sja1105_port_deferred_xmit in sja1105_main.c */
static struct sk_buff *sja1105_defer_xmit(struct sja1105_port *sp,
static struct sk_buff *sja1105_defer_xmit(struct dsa_port *dp,
struct sk_buff *skb)
{
struct sja1105_port *sp = dp->priv;
if (!dsa_port_is_sja1105(dp))
return skb;
/* Increase refcount so the kfree_skb in dsa_slave_xmit
* won't really free the packet.
*/
@ -128,8 +133,13 @@ static struct sk_buff *sja1105_defer_xmit(struct sja1105_port *sp,
return NULL;
}
static u16 sja1105_xmit_tpid(struct sja1105_port *sp)
static u16 sja1105_xmit_tpid(struct dsa_port *dp)
{
struct sja1105_port *sp = dp->priv;
if (unlikely(!dsa_port_is_sja1105(dp)))
return ETH_P_8021Q;
return sp->xmit_tpid;
}
@ -155,7 +165,7 @@ static struct sk_buff *sja1105_imprecise_xmit(struct sk_buff *skb,
*/
tx_vid = dsa_8021q_bridge_tx_fwd_offload_vid(dp->bridge_num);
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp->priv), tx_vid);
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), tx_vid);
}
static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
@ -174,9 +184,9 @@ static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
* is the .port_deferred_xmit driver callback.
*/
if (unlikely(sja1105_is_link_local(skb)))
return sja1105_defer_xmit(dp->priv, skb);
return sja1105_defer_xmit(dp, skb);
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp->priv),
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
((pcp << VLAN_PRIO_SHIFT) | tx_vid));
}
@ -200,7 +210,7 @@ static struct sk_buff *sja1110_xmit(struct sk_buff *skb,
* tag_8021q TX VLANs.
*/
if (likely(!sja1105_is_link_local(skb)))
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp->priv),
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
((pcp << VLAN_PRIO_SHIFT) | tx_vid));
skb_push(skb, SJA1110_HEADER_LEN);
@ -265,16 +275,16 @@ static struct sk_buff
bool is_link_local,
bool is_meta)
{
struct sja1105_port *sp;
struct dsa_port *dp;
dp = dsa_slave_to_port(skb->dev);
sp = dp->priv;
/* Step 1: A timestampable frame was received.
* Buffer it until we get its meta frame.
*/
if (is_link_local) {
struct dsa_port *dp = dsa_slave_to_port(skb->dev);
struct sja1105_port *sp = dp->priv;
if (unlikely(!dsa_port_is_sja1105(dp)))
return skb;
if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state))
/* Do normal processing. */
return skb;
@ -307,8 +317,13 @@ static struct sk_buff
* frame, which serves no further purpose).
*/
} else if (is_meta) {
struct dsa_port *dp = dsa_slave_to_port(skb->dev);
struct sja1105_port *sp = dp->priv;
struct sk_buff *stampable_skb;
if (unlikely(!dsa_port_is_sja1105(dp)))
return skb;
/* Drop the meta frame if we're not in the right state
* to process it.
*/