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Message-Id: <20200530115142.707415-7-olteanv@gmail.com>
Date: Sat, 30 May 2020 14:51:35 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
f.fainelli@...il.com, antoine.tenart@...tlin.com,
alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
alexandru.marginean@....com, claudiu.manoil@....com,
madalin.bucur@....nxp.com, radu-andrei.bulie@....com,
fido_max@...ox.ru, broonie@...nel.org
Subject: [PATCH v2 net-next 06/13] net: dsa: felix: create a template for the DSA tags on xmit
From: Vladimir Oltean <vladimir.oltean@....com>
With this patch we try to kill 2 birds with 1 stone.
First of all, some switches that use tag_ocelot.c don't have the exact
same bitfield layout for the DSA tags. The destination ports field is
different for Seville VSC9953 for example. So the choices are to either
duplicate tag_ocelot.c into a new tag_seville.c (sub-optimal) or somehow
take into account a supposed ocelot->dest_ports_offset when packing this
field into the DSA injection header (again not ideal).
Secondly, tag_ocelot.c already needs to memset a 128-bit area to zero
and call some packing() functions of dubious performance in the
fastpath. And most of the values it needs to pack are pretty much
constant (BYPASS=1, SRC_PORT=CPU, DEST=port index). So it would be good
if we could improve that.
The proposed solution is to allocate a memory area per port at probe
time, initialize that with the statically defined bits as per chip
hardware revision, and just perform a simpler memcpy in the fastpath.
Other alternatives have been analyzed, such as:
- Create a separate tag_seville.c: too much code duplication for just 1
bit field difference.
- Create a separate DSA_TAG_PROTO_SEVILLE under tag_ocelot.c, just like
tag_brcm.c, which would have a separate .xmit function. Again, too
much code duplication for just 1 bit field difference.
- Allocate the template from the init function of the tag_ocelot.c
module, instead of from the driver: couldn't figure out a method of
accessing the correct port template corresponding to the correct
tagger in the .xmit function.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v2:
Created a function pointer such that Seville could reuse more code.
drivers/net/dsa/ocelot/felix.c | 13 +++++++++++++
drivers/net/dsa/ocelot/felix.h | 1 +
drivers/net/dsa/ocelot/felix_vsc9959.c | 20 ++++++++++++++++++++
include/soc/mscc/ocelot.h | 2 ++
net/dsa/tag_ocelot.c | 21 ++++++++-------------
5 files changed, 44 insertions(+), 13 deletions(-)
diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 80b0735d680e..0346697bed3f 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -502,6 +502,7 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
for (port = 0; port < num_phys_ports; port++) {
struct ocelot_port *ocelot_port;
struct regmap *target;
+ u8 *template;
ocelot_port = devm_kzalloc(ocelot->dev,
sizeof(struct ocelot_port),
@@ -527,10 +528,22 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
return PTR_ERR(target);
}
+ template = devm_kzalloc(ocelot->dev, OCELOT_TAG_LEN,
+ GFP_KERNEL);
+ if (!template) {
+ dev_err(ocelot->dev,
+ "Failed to allocate memory for DSA tag\n");
+ kfree(port_phy_modes);
+ return -ENOMEM;
+ }
+
ocelot_port->phy_mode = port_phy_modes[port];
ocelot_port->ocelot = ocelot;
ocelot_port->target = target;
+ ocelot_port->xmit_template = template;
ocelot->ports[port] = ocelot_port;
+
+ felix->info->xmit_template_populate(ocelot, port);
}
kfree(port_phy_modes);
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index a891736ca006..2f28c28fdef0 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -40,6 +40,7 @@ struct felix_info {
enum tc_setup_type type, void *type_data);
void (*port_sched_speed_set)(struct ocelot *ocelot, int port,
u32 speed);
+ void (*xmit_template_populate)(struct ocelot *ocelot, int port);
};
extern struct felix_info felix_info_vsc9959;
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index bdc805686196..554f24fa6ff9 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -8,6 +8,7 @@
#include <soc/mscc/ocelot_ptp.h>
#include <soc/mscc/ocelot_sys.h>
#include <soc/mscc/ocelot.h>
+#include <linux/packing.h>
#include <net/pkt_sched.h>
#include <linux/iopoll.h>
#include <linux/pci.h>
@@ -1446,6 +1447,24 @@ static int vsc9959_port_setup_tc(struct dsa_switch *ds, int port,
}
}
+static void vsc9959_xmit_template_populate(struct ocelot *ocelot, int port)
+{
+ struct ocelot_port *ocelot_port = ocelot->ports[port];
+ u8 *template = ocelot_port->xmit_template;
+ u64 bypass, dest, src;
+
+ /* Set the source port as the CPU port module and not the
+ * NPI port
+ */
+ src = ocelot->num_phys_ports;
+ dest = BIT(port);
+ bypass = true;
+
+ packing(template, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0);
+ packing(template, &dest, 68, 56, OCELOT_TAG_LEN, PACK, 0);
+ packing(template, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0);
+}
+
struct felix_info felix_info_vsc9959 = {
.target_io_res = vsc9959_target_io_res,
.port_io_res = vsc9959_port_io_res,
@@ -1472,4 +1491,5 @@ struct felix_info felix_info_vsc9959 = {
.prevalidate_phy_mode = vsc9959_prevalidate_phy_mode,
.port_setup_tc = vsc9959_port_setup_tc,
.port_sched_speed_set = vsc9959_sched_speed_set,
+ .xmit_template_populate = vsc9959_xmit_template_populate,
};
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 8e6c13d99ced..1a87a3a32616 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -549,6 +549,8 @@ struct ocelot_port {
u8 ts_id;
phy_interface_t phy_mode;
+
+ u8 *xmit_template;
};
struct ocelot {
diff --git a/net/dsa/tag_ocelot.c b/net/dsa/tag_ocelot.c
index b0c98ee4e13b..42f327c06dca 100644
--- a/net/dsa/tag_ocelot.c
+++ b/net/dsa/tag_ocelot.c
@@ -137,11 +137,10 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct dsa_port *dp = dsa_slave_to_port(netdev);
- u64 bypass, dest, src, qos_class, rew_op;
struct dsa_switch *ds = dp->ds;
- int port = dp->index;
struct ocelot *ocelot = ds->priv;
- struct ocelot_port *ocelot_port = ocelot->ports[port];
+ struct ocelot_port *ocelot_port;
+ u64 qos_class, rew_op;
u8 *injection;
if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) {
@@ -149,19 +148,15 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
return NULL;
}
- injection = skb_push(skb, OCELOT_TAG_LEN);
+ ocelot_port = ocelot->ports[dp->index];
- memset(injection, 0, OCELOT_TAG_LEN);
+ injection = skb_push(skb, OCELOT_TAG_LEN);
- /* Set the source port as the CPU port module and not the NPI port */
- src = ocelot->num_phys_ports;
- dest = BIT(port);
- bypass = true;
+ memcpy(injection, ocelot_port->xmit_template, OCELOT_TAG_LEN);
+ /* Fix up the fields which are not statically determined
+ * in the template
+ */
qos_class = skb->priority;
-
- packing(injection, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0);
- packing(injection, &dest, 68, 56, OCELOT_TAG_LEN, PACK, 0);
- packing(injection, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0);
packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0);
if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
--
2.25.1
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