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Date: Tue, 6 Oct 2015 09:43:55 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Scott Feldman <sfeldma@...il.com>
Cc: Netdev <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Ido Schimmel <idosch@...lanox.com>, eladr@...lanox.com,
Thomas Graf <tgraf@...g.ch>,
Alexei Starovoitov <ast@...mgrid.com>,
David Laight <David.Laight@...lab.com>,
john fastabend <john.fastabend@...il.com>
Subject: Re: [patch net-next v2 06/13] rocker: introduce worlds infrastructure
Tue, Oct 06, 2015 at 07:16:29AM CEST, sfeldma@...il.com wrote:
>On Mon, Oct 5, 2015 at 10:43 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>>
>> This is another step on the way to per-world clean cut. Introduce world
>> ops hooks which each world can implement in world-specific way.
>> Also introduce world infrastructure including function for port worlds
>> change.
>>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>> v1->v2:
>> - removed functions to change worlds based on name, as rtnl mode
>> set patch is removed from patchset.
>> ---
>> drivers/net/ethernet/rocker/rocker.h | 56 ++++
>> drivers/net/ethernet/rocker/rocker_main.c | 464 +++++++++++++++++++++++++++++-
>> 2 files changed, 519 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/rocker/rocker.h b/drivers/net/ethernet/rocker/rocker.h
>> index 650caa0..d49bc5d 100644
>> --- a/drivers/net/ethernet/rocker/rocker.h
>> +++ b/drivers/net/ethernet/rocker/rocker.h
>> @@ -12,7 +12,11 @@
>> #ifndef _ROCKER_H
>> #define _ROCKER_H
>>
>> +#include <linux/kernel.h>
>> #include <linux/types.h>
>> +#include <linux/netdevice.h>
>> +#include <net/neighbour.h>
>> +#include <net/switchdev.h>
>>
>> #include "rocker_hw.h"
>>
>> @@ -24,4 +28,56 @@ struct rocker_desc_info {
>> dma_addr_t mapaddr;
>> };
>>
>> +struct rocker;
>> +struct rocker_port;
>> +
>> +struct rocker_world_ops {
>> + const char *kind;
>> + size_t priv_size;
>> + size_t port_priv_size;
>> + u8 mode;
>> + int (*init)(struct rocker *rocker, void *priv);
>> + void (*fini)(void *priv);
>> + int (*port_init)(struct rocker_port *rocker_port, void *priv,
>> + void *port_priv);
>> + void (*port_fini)(void *port_priv);
>> + int (*port_open)(void *port_priv);
>> + void (*port_stop)(void *port_priv);
>> + int (*port_attr_stp_state_set)(void *port_priv, u8 state,
>> + struct switchdev_trans *trans);
>> + int (*port_attr_bridge_flags_set)(void *port_priv,
>> + unsigned long brport_flags,
>> + struct switchdev_trans *trans);
>> + int (*port_attr_bridge_flags_get)(void *port_priv,
>> + unsigned long *p_brport_flags);
>> + int (*port_obj_vlan_add)(void *port_priv,
>> + const struct switchdev_obj_port_vlan *vlan,
>> + struct switchdev_trans *trans);
>> + int (*port_obj_vlan_del)(void *port_priv,
>> + const struct switchdev_obj_port_vlan *vlan);
>> + int (*port_obj_vlan_dump)(void *port_priv,
>> + struct switchdev_obj_port_vlan *vlan,
>> + switchdev_obj_dump_cb_t *cb);
>> + int (*port_obj_fib4_add)(void *port_priv,
>> + const struct switchdev_obj_ipv4_fib *fib4,
>> + struct switchdev_trans *trans);
>> + int (*port_obj_fib4_del)(void *port_priv,
>> + const struct switchdev_obj_ipv4_fib *fib4);
>> + int (*port_obj_fdb_add)(void *port_priv,
>> + const struct switchdev_obj_port_fdb *fdb,
>> + struct switchdev_trans *trans);
>> + int (*port_obj_fdb_del)(void *port_priv,
>> + const struct switchdev_obj_port_fdb *fdb);
>> + int (*port_obj_fdb_dump)(void *port_priv,
>> + struct switchdev_obj_port_fdb *fdb,
>> + switchdev_obj_dump_cb_t *cb);
>> + int (*port_master_linked)(void *port_priv, struct net_device *master);
>> + int (*port_master_unlinked)(void *port_priv, struct net_device *master);
>> + int (*port_neigh_update)(void *port_priv, struct neighbour *n);
>> + int (*port_neigh_destroy)(void *port_priv, struct neighbour *n);
>> + int (*port_ev_mac_vlan_seen)(void *port_priv,
>> + const unsigned char *addr,
>> + __be16 vlan_id);
>> +};
>
>Yuck, void *. Can we do better?
I see nothing wrong with this priv usage. It's done like this on many
places. I think it is completely legit, since the call points are well
defined and wrapped.
>
>How about using base struct rocker_port and then sub-classing
>world-specific rocker ports. And make rocker_world_ops pass struct
>rocker_port * (for the port-centric ops).
>
>struct rocker_port {
> // common stuff for all worlds
>};
>
>struct my_world_port {
> struct rocker_port rocker_port;
> // world-specific stuff for port
>};
>
>#define MY_WORLD_PORT(rocker_port) \
> container_of(rocker_port, struct my_world_port, rocker_port)
>
>Same for world-centric ops:
>
>struct rocker_world {
> // common stuff for all worlds
>};
>
>struct my_world {
> struct rocker_world rocker_world;
> // stuff for this world
>};
This would be unnecessary complex. + this cannot be done because you
would have to know the world in advance of creating the structs and you
would not be able to switch it. No, not a good idea.
>
>
>> +static int rocker_world_port_ev_mac_vlan_seen(struct rocker_port *rocker_port,
>> + const unsigned char *addr,
>> + __be16 vlan_id);
>>
>> static int rocker_event_mac_vlan_seen(const struct rocker *rocker,
>> const struct rocker_tlv *info)
>> @@ -1246,6 +1252,7 @@ static int rocker_event_mac_vlan_seen(const struct rocker *rocker,
>> const unsigned char *addr;
>> int flags = ROCKER_OP_FLAG_NOWAIT | ROCKER_OP_FLAG_LEARNED;
>> __be16 vlan_id;
>> + int err;
>>
>> rocker_tlv_parse_nested(attrs, ROCKER_TLV_EVENT_MAC_VLAN_MAX, info);
>> if (!attrs[ROCKER_TLV_EVENT_MAC_VLAN_PPORT] ||
>> @@ -1262,6 +1269,10 @@ static int rocker_event_mac_vlan_seen(const struct rocker *rocker,
>>
>> rocker_port = rocker->ports[port_number];
>>
>> + err = rocker_world_port_ev_mac_vlan_seen(rocker_port, addr, vlan_id);
>> + if (err)
>> + return err;
>> +
>
>Why is this in this patch?
>
>> +static int rocker_world_port_attr_stp_state_set(struct rocker_port *rocker_port,
>> + u8 state,
>> + struct switchdev_trans *trans)
>> +{
>> + struct rocker_world *world = rocker_port->world;
>> +
>> + if (!world->ops->port_attr_stp_state_set)
>> + return 0;
>
>Should return -EOPNOTSUPP. Returning 0 means the operation
>succeeded. I would like to avoid silent failures. If the user does
>something to a port, and the operation is not supported on the port,
>return -EOPNOTSUPP so user gets some feedback that operation failed.
>Returning 0 gives the user feedback that the operation succeeded, when
>in fact nothing happened at all.
At this stage of the patchset, this has to return 0 in order not to
break the flows.
-EOPNOTSUPP is treated like 0 upper in callers anyway. But I agree that
we can return -OPNOTSUPP in these cases. Will add a patch that changes
this to the end of the patchset.
>
>> + return world->ops->port_attr_stp_state_set(rocker_port->world_port_priv,
>> + state, trans);
>> +}
>> +
>> +static int
>> +rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
>> + unsigned long brport_flags,
>> + struct switchdev_trans *trans)
>> +{
>> + struct rocker_world *world = rocker_port->world;
>> +
>> + if (!world->ops->port_attr_bridge_flags_set)
>> + return 0;
>
>Same comment, pretty much down the list...
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