diff options
| -rw-r--r-- | include/net/dsa.h | 8 | ||||
| -rw-r--r-- | net/dsa/dsa2.c | 48 | ||||
| -rw-r--r-- | net/dsa/dsa_priv.h | 2 | ||||
| -rw-r--r-- | net/dsa/port.c | 39 |
4 files changed, 58 insertions, 39 deletions
diff --git a/include/net/dsa.h b/include/net/dsa.h index 0c2cba45fa79..c7ea0f61056f 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -155,9 +155,6 @@ struct dsa_switch_tree { /* Track the largest switch index within a tree */ unsigned int last_switch; - - /* Track the bridges with forwarding offload enabled */ - unsigned long fwd_offloading_bridges; }; #define dsa_lags_foreach_id(_id, _dst) \ @@ -411,8 +408,9 @@ struct dsa_switch { unsigned int num_lag_ids; /* Drivers that support bridge forwarding offload should set this to - * the maximum number of bridges spanning the same switch tree that can - * be offloaded. + * the maximum number of bridges spanning the same switch tree (or all + * trees, in the case of cross-tree bridging support) that can be + * offloaded. */ unsigned int num_fwd_offloading_bridges; diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index dcd67801eca4..1b2b25d7bd02 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -21,6 +21,9 @@ static DEFINE_MUTEX(dsa2_mutex); LIST_HEAD(dsa_tree_list); +/* Track the bridges with forwarding offload enabled */ +static unsigned long dsa_fwd_offloading_bridges; + /** * dsa_tree_notify - Execute code for all switches in a DSA switch tree. * @dst: collection of struct dsa_switch devices to notify. @@ -126,6 +129,51 @@ void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag) } } +static int dsa_bridge_num_find(const struct net_device *bridge_dev) +{ + struct dsa_switch_tree *dst; + struct dsa_port *dp; + + /* When preparing the offload for a port, it will have a valid + * dp->bridge_dev pointer but a not yet valid dp->bridge_num. + * However there might be other ports having the same dp->bridge_dev + * and a valid dp->bridge_num, so just ignore this port. + */ + list_for_each_entry(dst, &dsa_tree_list, list) + list_for_each_entry(dp, &dst->ports, list) + if (dp->bridge_dev == bridge_dev && + dp->bridge_num != -1) + return dp->bridge_num; + + return -1; +} + +int dsa_bridge_num_get(const struct net_device *bridge_dev, int max) +{ + int bridge_num = dsa_bridge_num_find(bridge_dev); + + if (bridge_num < 0) { + /* First port that offloads TX forwarding for this bridge */ + bridge_num = find_first_zero_bit(&dsa_fwd_offloading_bridges, + DSA_MAX_NUM_OFFLOADING_BRIDGES); + if (bridge_num >= max) + return -1; + + set_bit(bridge_num, &dsa_fwd_offloading_bridges); + } + + return bridge_num; +} + +void dsa_bridge_num_put(const struct net_device *bridge_dev, int bridge_num) +{ + /* Check if the bridge is still in use, otherwise it is time + * to clean it up so we can reuse this bridge_num later. + */ + if (!dsa_bridge_num_find(bridge_dev)) + clear_bit(bridge_num, &dsa_fwd_offloading_bridges); +} + struct dsa_switch *dsa_switch_find(int tree_index, int sw_index) { struct dsa_switch_tree *dst; diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index b7a269e0513f..88aaf43b2da4 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -543,6 +543,8 @@ int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, struct net_device *master, const struct dsa_device_ops *tag_ops, const struct dsa_device_ops *old_tag_ops); +int dsa_bridge_num_get(const struct net_device *bridge_dev, int max); +void dsa_bridge_num_put(const struct net_device *bridge_dev, int bridge_num); /* tag_8021q.c */ int dsa_tag_8021q_bridge_join(struct dsa_switch *ds, diff --git a/net/dsa/port.c b/net/dsa/port.c index 979042a64d1a..4fbe81ffb1ce 100644 --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -270,27 +270,9 @@ static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp) */ } -static int dsa_tree_find_bridge_num(struct dsa_switch_tree *dst, - struct net_device *bridge_dev) -{ - struct dsa_port *dp; - - /* When preparing the offload for a port, it will have a valid - * dp->bridge_dev pointer but a not yet valid dp->bridge_num. - * However there might be other ports having the same dp->bridge_dev - * and a valid dp->bridge_num, so just ignore this port. - */ - list_for_each_entry(dp, &dst->ports, list) - if (dp->bridge_dev == bridge_dev && dp->bridge_num != -1) - return dp->bridge_num; - - return -1; -} - static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp, struct net_device *bridge_dev) { - struct dsa_switch_tree *dst = dp->ds->dst; int bridge_num = dp->bridge_num; struct dsa_switch *ds = dp->ds; @@ -300,11 +282,7 @@ static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp, dp->bridge_num = -1; - /* Check if the bridge is still in use, otherwise it is time - * to clean it up so we can reuse this bridge_num later. - */ - if (!dsa_tree_find_bridge_num(dst, bridge_dev)) - clear_bit(bridge_num, &dst->fwd_offloading_bridges); + dsa_bridge_num_put(bridge_dev, bridge_num); /* Notify the chips only once the offload has been deactivated, so * that they can update their configuration accordingly. @@ -316,23 +294,16 @@ static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp, static bool dsa_port_bridge_tx_fwd_offload(struct dsa_port *dp, struct net_device *bridge_dev) { - struct dsa_switch_tree *dst = dp->ds->dst; struct dsa_switch *ds = dp->ds; int bridge_num, err; if (!ds->ops->port_bridge_tx_fwd_offload) return false; - bridge_num = dsa_tree_find_bridge_num(dst, bridge_dev); - if (bridge_num < 0) { - /* First port that offloads TX forwarding for this bridge */ - bridge_num = find_first_zero_bit(&dst->fwd_offloading_bridges, - DSA_MAX_NUM_OFFLOADING_BRIDGES); - if (bridge_num >= ds->num_fwd_offloading_bridges) - return false; - - set_bit(bridge_num, &dst->fwd_offloading_bridges); - } + bridge_num = dsa_bridge_num_get(bridge_dev, + ds->num_fwd_offloading_bridges); + if (bridge_num < 0) + return false; dp->bridge_num = bridge_num; |