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net: dsa: fix filling routing table from OF description 

According to description in 'include/net/dsa.h', in cascade switches
configurations where there are more than one interconnected devices,
'rtable' array in 'dsa_chip_data' structure is used to indicate which
port on this switch should be used to send packets to that are destined
for corresponding switch.

However, dsa_of_setup_routing_table() fills 'rtable' with port numbers
of the _target_ switch, but not current one.

This commit removes redundant devicetree parsing and adds needed port
number as a function argument. So dsa_of_setup_routing_table() now just
looks for target switch number by parsing parent of 'link' device node.

To remove possible misunderstandings with the way of determining target
switch number, a corresponding comment was added to the source code and
to the DSA device tree bindings documentation file.

This was tested on a custom board with two Marvell 88E6095 switches with
following corresponding routing tables: { -1, 10 } and { 8, -1 }.

Signed-off-by: Pavel Nakonechny <pavel.nakonechny@skitlab.ru>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Pavel Nakonechny 2015-04-05 00:46:21 +03:00 committed by David S. Miller
parent 67e04c29ec
commit 303038135a
2 changed files with 10 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/net/dsa/dsa.txt
View File

@ -19,7 +19,9 @@ the parent DSA node. The maximum number of allowed child nodes is 4
(DSA_MAX_SWITCHES).
Each of these switch child nodes should have the following required properties:
- reg : Describes the switch address on the MII bus
- reg : Contains two fields. The first one describes the
address on the MII bus. The second is the switch
number that must be unique in cascaded configurations
- #address-cells : Must be 1
- #size-cells : Must be 0

23
net/dsa/dsa.c
View File

@ -501,12 +501,10 @@ static struct net_device *dev_to_net_device(struct device *dev)
#ifdef CONFIG_OF
static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
struct dsa_chip_data *cd,
int chip_index,
int chip_index, int port_index,
struct device_node *link)
{
int ret;
const __be32 *reg;
int link_port_addr;
int link_sw_addr;
struct device_node *parent_sw;
int len;
@ -519,6 +517,10 @@ static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
if (!reg || (len != sizeof(*reg) * 2))
return -EINVAL;
/*
* Get the destination switch number from the second field of its 'reg'
* property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
*/
link_sw_addr = be32_to_cpup(reg + 1);
if (link_sw_addr >= pd->nr_chips)
@ -535,20 +537,9 @@ static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
}
reg = of_get_property(link, "reg", NULL);
if (!reg) {
ret = -EINVAL;
goto out;
}
link_port_addr = be32_to_cpup(reg);
cd->rtable[link_sw_addr] = link_port_addr;
cd->rtable[link_sw_addr] = port_index;
return 0;
out:
kfree(cd->rtable);
return ret;
}
static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
@ -658,7 +649,7 @@ static int dsa_of_probe(struct platform_device *pdev)
if (!strcmp(port_name, "dsa") && link &&
pd->nr_chips > 1) {
ret = dsa_of_setup_routing_table(pd, cd,
chip_index, link);
chip_index, port_index, link);
if (ret)
goto out_free_chip;
}