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net: dsa: add ports list in the switch fabric

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Add a list of switch ports within the switch fabric. This will help the
lookup of a port inside the whole fabric, and it is the first step
towards supporting multiple CPU ports, before deprecating the usage of
the unique dst->cpu_dp pointer.

In preparation for a future allocation of the dsa_port structures,
return -ENOMEM in case no structure is returned, even though this
error cannot be reached yet.

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Vivien Didelot 2019-10-21 16:51:16 -04:00 • committed by Jakub Kicinski
parent 68bb8ea8ad
commit ab8ccae122
2 changed files with 47 additions and 6 deletions
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5
include/net/dsa.h
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@ -125,6 +125,9 @@ struct dsa_switch_tree {
*/
struct dsa_port *cpu_dp;
/* List of switch ports */
struct list_head ports;
/*
* Data for the individual switch chips.
*/
@ -195,6 +198,8 @@ struct dsa_port {
struct work_struct xmit_work;
struct sk_buff_head xmit_queue;
struct list_head list;
/*
* Give the switch driver somewhere to hang its per-port private data
* structures (accessible from the tagger).