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Date: Wed, 10 Dec 2014 10:59:18 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: roopa@...ulusnetworks.com
Cc: sfeldma@...il.com, jhs@...atatu.com, bcrl@...ck.org, tgraf@...g.ch,
john.fastabend@...il.com, stephen@...workplumber.org,
linville@...driver.com, vyasevic@...hat.com,
netdev@...r.kernel.org, davem@...emloft.net,
shm@...ulusnetworks.com, gospo@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 3/4] bridge: offload bridge port attributes
to switch asic if feature flag set
Wed, Dec 10, 2014 at 10:05:19AM CET, roopa@...ulusnetworks.com wrote:
>From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
>This patch adds support to set/del bridge port attributes in hardware from
>the bridge driver.
>
>When the user sends a bridge setlink message, it will come in with 'master',
> - go to the bridge driver ndo_bridge_setlink handler,
> - set settings in the kernel
> - if offload mode is set on the port, also call the swicthdev api to
> propagate the attrs to the switchdev hardware
>
> If you want to act on the hw alone, you can still use the self flag to
> go to the switch hw or switch port driver directly.
>
>This is done in the bridge driver to rollback kernel settings
>on hw programming failure if required in the future.
>
>With this, it also makes sure a notification goes out only after the
>attributes are set both in the kernel and hw.
>
>The patch calls switchdev api only if BRIDGE_FLAGS_SELF is not set.
>This is because the offload cases with BRIDGE_FLAGS_SELF are handled in
>the caller (in rtnetlink.c). This needed flags (IFLA_BRIDGE_FLAGS) to be
>passed to bridge setlink and dellink functions, to avoid
>another call to parse of IFLA_AF_SPEC in br_setlink/br_getlink respectively.
>
>Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-
> drivers/net/ethernet/rocker/rocker.c | 2 +-
> include/linux/netdevice.h | 4 +--
> net/bridge/br_netlink.c | 38 +++++++++++++++++++++----
> net/bridge/br_private.h | 4 +--
> net/core/rtnetlink.c | 8 +++---
> 6 files changed, 43 insertions(+), 15 deletions(-)
>
>diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>index 9afa167..0b8cf39 100644
>--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>@@ -7721,7 +7721,7 @@ static int ixgbe_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
> }
>
> static int ixgbe_ndo_bridge_setlink(struct net_device *dev,
>- struct nlmsghdr *nlh)
>+ struct nlmsghdr *nlh, u16 flags)
> {
> struct ixgbe_adapter *adapter = netdev_priv(dev);
> struct nlattr *attr, *br_spec;
>diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
>index fded127..377979c 100644
>--- a/drivers/net/ethernet/rocker/rocker.c
>+++ b/drivers/net/ethernet/rocker/rocker.c
>@@ -3696,7 +3696,7 @@ skip:
> }
>
> static int rocker_port_bridge_setlink(struct net_device *dev,
>- struct nlmsghdr *nlh)
>+ struct nlmsghdr *nlh, u16 flags)
> {
> struct rocker_port *rocker_port = netdev_priv(dev);
> struct nlattr *protinfo;
>diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>index 29c92ee..a9c2ce2 100644
>--- a/include/linux/netdevice.h
>+++ b/include/linux/netdevice.h
>@@ -1151,13 +1151,13 @@ struct net_device_ops {
> int idx);
>
> int (*ndo_bridge_setlink)(struct net_device *dev,
>- struct nlmsghdr *nlh);
>+ struct nlmsghdr *nlh, u16 flags);
> int (*ndo_bridge_getlink)(struct sk_buff *skb,
> u32 pid, u32 seq,
> struct net_device *dev,
> u32 filter_mask);
> int (*ndo_bridge_dellink)(struct net_device *dev,
>- struct nlmsghdr *nlh);
>+ struct nlmsghdr *nlh, u16 flags);
> int (*ndo_change_carrier)(struct net_device *dev,
> bool new_carrier);
> int (*ndo_get_phys_port_id)(struct net_device *dev,
>diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>index 9f5eb55..b4299d1 100644
>--- a/net/bridge/br_netlink.c
>+++ b/net/bridge/br_netlink.c
>@@ -16,6 +16,7 @@
> #include <net/rtnetlink.h>
> #include <net/net_namespace.h>
> #include <net/sock.h>
>+#include <net/switchdev.h>
> #include <uapi/linux/if_bridge.h>
>
> #include "br_private.h"
>@@ -359,13 +360,13 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
> }
>
> /* Change state and parameters on port. */
>-int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
>+int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
> {
> struct nlattr *protinfo;
> struct nlattr *afspec;
> struct net_bridge_port *p;
> struct nlattr *tb[IFLA_BRPORT_MAX + 1];
>- int err = 0;
>+ int err = 0, ret_offload = 0;
^^^^^^^^^^^ you can reuse "err" for this.
>
> protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
> afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
>@@ -407,19 +408,32 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
> afspec, RTM_SETLINK);
> }
>
>+ if (!(flags & BRIDGE_FLAGS_SELF)) {
>+ /*
^^^^^^^^^^^^^^^^^ Comment should start here.
This is also something that should be
discovered by scripts/checkpatch.pl
>+ * set bridge attributes in hardware if supported
>+ */
>+ ret_offload = netdev_switch_port_bridge_setlink(dev, nlh, flags);
>+ if (ret_offload && ret_offload != -EOPNOTSUPP) {
>+ /*
^^^^^^^^^ same here
>+ * XXX Fix this in the future to rollback
>+ * kernel settings and return error
How hard would it be to do the rollback now?
>+ */
>+ br_warn(p->br, "error hw set of bridge attributes on port %u(%s)\n", (unsigned int) p->port_no, p->dev->name);
^^^^
missing
"\n"
here?
>+ }
>+ }
>+
> if (err == 0)
> br_ifinfo_notify(RTM_NEWLINK, p);
>-
> out:
> return err;
> }
>
> /* Delete port information */
>-int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
>+int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
> {
> struct nlattr *afspec;
> struct net_bridge_port *p;
>- int err;
>+ int err = 0, ret_offload = 0;
>
> afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
> if (!afspec)
>@@ -433,6 +447,20 @@ int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
> err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
> afspec, RTM_DELLINK);
>
>+ if (!(flags & BRIDGE_FLAGS_SELF)) {
>+ /*
^^^ and here
>+ * del bridge attributes in hardware
>+ */
>+ ret_offload = netdev_switch_port_bridge_dellink(dev, nlh, flags);
>+ if (ret_offload && ret_offload != -EOPNOTSUPP) {
>+ /*
^^^ and here
>+ * XXX Fix this in the future to rollback
>+ * kernel settings and return error
>+ */
>+ br_warn(p->br, "error hw delete of bridge port attributes on port %u(%s)\n", (unsigned int) p->port_no, p->dev->name);
>+ }
>+ }
>+
> return err;
> }
> static int br_validate(struct nlattr *tb[], struct nlattr *data[])
>diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
>index aea3d13..0ebad7c 100644
>--- a/net/bridge/br_private.h
>+++ b/net/bridge/br_private.h
>@@ -815,8 +815,8 @@ extern struct rtnl_link_ops br_link_ops;
> int br_netlink_init(void);
> void br_netlink_fini(void);
> void br_ifinfo_notify(int event, struct net_bridge_port *port);
>-int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
>-int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
>+int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
>+int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
> int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
> u32 filter_mask);
>
>diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>index 61cb7e7..3c48d97 100644
>--- a/net/core/rtnetlink.c
>+++ b/net/core/rtnetlink.c
>@@ -2922,7 +2922,7 @@ static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
> goto out;
> }
>
>- err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
>+ err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
> if (err)
> goto out;
>
>@@ -2933,7 +2933,7 @@ static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
> if (!dev->netdev_ops->ndo_bridge_setlink)
> err = -EOPNOTSUPP;
> else
>- err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
>+ err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
>
> if (!err)
> flags &= ~BRIDGE_FLAGS_SELF;
>@@ -2995,7 +2995,7 @@ static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
> goto out;
> }
>
>- err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
>+ err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
> if (err)
> goto out;
>
>@@ -3006,7 +3006,7 @@ static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
> if (!dev->netdev_ops->ndo_bridge_dellink)
> err = -EOPNOTSUPP;
> else
>- err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
>+ err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
>
> if (!err)
> flags &= ~BRIDGE_FLAGS_SELF;
>--
>1.7.10.4
>
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