[PATCH net-next,v3 10/11] net: flow_offload: add flow_block_cb_is_busy() and use it

Pablo Neira Ayuso
2019-07-08T16:06:55Z

This patch adds a function to check if flow block callback is already in
use. Call this new function from flow_block_cb_setup_simple() and from
drivers.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v3: formerly known as "net: flow_offload: don't allow subsystem to reuse blocks"
add flow_block_cb_is_busy() helper. Call it per driver to make it easier
to remove this whenever the first driver client support for multiple
subsystem offloads.

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 4 ++++
drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 4 ++++
drivers/net/ethernet/mscc/ocelot_tc.c | 3 +++
drivers/net/ethernet/netronome/nfp/flower/offload.c | 4 ++++
include/net/flow_offload.h | 3 +++
net/core/flow_offload.c | 18 ++++++++++++++++++
net/dsa/slave.c | 3 +++
7 files changed, 39 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 19133b9e121a..e303149053e4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -721,6 +721,10 @@ mlx5e_rep_indr_setup_tc_block(struct net_device *netdev,
if (indr_priv)
return -EEXIST;

+ if (flow_block_cb_is_busy(mlx5e_rep_indr_setup_block_cb,
+ indr_priv, &mlx5e_block_cb_list))
+ return -EBUSY;
+
indr_priv = kmalloc(sizeof(*indr_priv), GFP_KERNEL);
if (!indr_priv)
return -ENOMEM;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 90a4241551ee..f5b4d5eaa35a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -1696,6 +1696,10 @@ static int mlxsw_sp_setup_tc_block(struct mlxsw_sp_port *mlxsw_sp_port,

switch (f->command) {
case FLOW_BLOCK_BIND:
+ if (flow_block_cb_is_busy(cb, mlxsw_sp_port,
+ &mlxsw_sp_block_cb_list))
+ return -EBUSY;
+
block_cb = flow_block_cb_alloc(f->net, cb, mlxsw_sp_port,
mlxsw_sp_port, NULL);
if (IS_ERR(block_cb))
diff --git a/drivers/net/ethernet/mscc/ocelot_tc.c b/drivers/net/ethernet/mscc/ocelot_tc.c
index 9bca2cc77e6c..e7d2473129f0 100644
--- a/drivers/net/ethernet/mscc/ocelot_tc.c
+++ b/drivers/net/ethernet/mscc/ocelot_tc.c
@@ -153,6 +153,9 @@ static int ocelot_setup_tc_block(struct ocelot_port *port,

switch (f->command) {
case FLOW_BLOCK_BIND:
+ if (flow_block_cb_is_busy(cb, port, &ocelot_block_cb_list))
+ return -EBUSY;
+
block_cb = flow_block_cb_alloc(f->net, cb, port, port, NULL);
if (IS_ERR(block_cb))
return PTR_ERR(block_cb);
diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 9ce61b6e8583..4bdbd322fddf 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1320,6 +1320,10 @@ static int nfp_flower_setup_tc_block(struct net_device *netdev,

switch (f->command) {
case FLOW_BLOCK_BIND:
+ if (flow_block_cb_is_busy(nfp_flower_setup_tc_block_cb, repr,
+ &nfp_block_cb_list))
+ return -EBUSY;
+
block_cb = flow_block_cb_alloc(f->net,
nfp_flower_setup_tc_block_cb,
repr, repr, NULL);
diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index 7977508ec406..1751b31ea7e2 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -292,6 +292,9 @@ static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
list_move(&block_cb->driver_list, &offload->cb_list);
}

+bool flow_block_cb_is_busy(tc_setup_cb_t *cb, void *cb_ident,
+ struct list_head *driver_block_list);
+
int flow_block_cb_setup_simple(struct flow_block_offload *f,
struct list_head *driver_list, tc_setup_cb_t *cb,
void *cb_ident, void *cb_priv, bool ingress_only);
diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
index 4bea343d52a0..39219513181e 100644
--- a/net/core/flow_offload.c
+++ b/net/core/flow_offload.c
@@ -229,6 +229,21 @@ unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
}
EXPORT_SYMBOL(flow_block_cb_decref);

+bool flow_block_cb_is_busy(tc_setup_cb_t *cb, void *cb_ident,
+ struct list_head *driver_block_list)
+{
+ struct flow_block_cb *block_cb;
+
+ list_for_each_entry(block_cb, driver_block_list, driver_list) {
+ if (block_cb->cb == cb &&
+ block_cb->cb_ident == cb_ident)
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL(flow_block_cb_is_busy);
+
int flow_block_cb_setup_simple(struct flow_block_offload *f,
struct list_head *driver_block_list,
tc_setup_cb_t *cb, void *cb_ident, void *cb_priv,
@@ -244,6 +259,9 @@ int flow_block_cb_setup_simple(struct flow_block_offload *f,

switch (f->command) {
case FLOW_BLOCK_BIND:
+ if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
+ return -EBUSY;
+
block_cb = flow_block_cb_alloc(f->net, cb, cb_ident,
cb_priv, NULL);
if (IS_ERR(block_cb))
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index d2e74d08c1c4..335580cfa486 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -961,6 +961,9 @@ static int dsa_slave_setup_tc_block(struct net_device *dev,

switch (f->command) {
case FLOW_BLOCK_BIND:
+ if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
+ return -EBUSY;
+
block_cb = flow_block_cb_alloc(f->net, cb, dev, dev, NULL);
if (IS_ERR(block_cb))
return PTR_ERR(block_cb);
--
2.11.0