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Date: Thu, 22 Jul 2021 11:19:36 +0200
From: Simon Horman <simon.horman@...igine.com>
To: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
oss-drivers@...igine.com, Baowen Zheng <baowen.zheng@...igine.com>,
Louis Peens <louis.peens@...igine.com>,
Simon Horman <simon.horman@...igine.com>
Subject: [PATCH net-next 1/3] flow_offload: allow user to offload tc action to net device
From: Baowen Zheng <baowen.zheng@...igine.com>
Use flow_indr_dev_register/flow_indr_dev_setup_offload to
offload tc action.
We offload the tc action mainly for ovs meter configuration.
Make some basic changes for different vendors to return EOPNOTSUPP.
We need to call tc_cleanup_flow_action to clean up tc action entry since
in tc_setup_action, some actions may hold dev refcnt, especially the mirror
action.
As per review from the RFC, the kernel test robot will fail to run, so
we add CONFIG_NET_CLS_ACT control for the action offload.
Signed-off-by: Baowen Zheng <baowen.zheng@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
Signed-off-by: Simon Horman <simon.horman@...igine.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 2 +-
.../ethernet/mellanox/mlx5/core/en/rep/tc.c | 3 ++
.../ethernet/netronome/nfp/flower/offload.c | 3 ++
include/linux/netdevice.h | 1 +
include/net/flow_offload.h | 15 ++++++++
include/net/pkt_cls.h | 15 ++++++++
net/core/flow_offload.c | 26 +++++++++++++-
net/sched/act_api.c | 33 +++++++++++++++++
net/sched/cls_api.c | 36 ++++++++++++++++---
9 files changed, 128 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index 5e4429b14b8c..edbbf7b4df77 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -1951,7 +1951,7 @@ static int bnxt_tc_setup_indr_cb(struct net_device *netdev, struct Qdisc *sch, v
void *data,
void (*cleanup)(struct flow_block_cb *block_cb))
{
- if (!bnxt_is_netdev_indr_offload(netdev))
+ if (!netdev || !bnxt_is_netdev_indr_offload(netdev))
return -EOPNOTSUPP;
switch (type) {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
index 059799e4f483..111daacc4cc3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
@@ -486,6 +486,9 @@ int mlx5e_rep_indr_setup_cb(struct net_device *netdev, struct Qdisc *sch, void *
void *data,
void (*cleanup)(struct flow_block_cb *block_cb))
{
+ if (!netdev)
+ return -EOPNOTSUPP;
+
switch (type) {
case TC_SETUP_BLOCK:
return mlx5e_rep_indr_setup_block(netdev, sch, cb_priv, type_data,
diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 2406d33356ad..88bbc86347b4 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1869,6 +1869,9 @@ nfp_flower_indr_setup_tc_cb(struct net_device *netdev, struct Qdisc *sch, void *
void *data,
void (*cleanup)(struct flow_block_cb *block_cb))
{
+ if (!netdev)
+ return -EOPNOTSUPP;
+
if (!nfp_fl_is_netdev_to_offload(netdev))
return -EOPNOTSUPP;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 42f6f866d5f3..b138219baf6f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -923,6 +923,7 @@ enum tc_setup_type {
TC_SETUP_QDISC_TBF,
TC_SETUP_QDISC_FIFO,
TC_SETUP_QDISC_HTB,
+ TC_SETUP_ACT,
};
/* These structures hold the attributes of bpf state that are being passed
diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index 69c9eabf8325..26644596fd54 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -553,6 +553,21 @@ struct flow_cls_offload {
u32 classid;
};
+enum flow_act_command {
+ FLOW_ACT_REPLACE,
+ FLOW_ACT_DESTROY,
+ FLOW_ACT_STATS,
+};
+
+struct flow_offload_action {
+ struct netlink_ext_ack *extack;
+ enum flow_act_command command;
+ struct flow_stats stats;
+ struct flow_action action;
+};
+
+struct flow_offload_action *flow_action_alloc(unsigned int num_actions);
+
static inline struct flow_rule *
flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
{
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index ec7823921bd2..cd4cf6b10f5d 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -266,6 +266,9 @@ static inline void tcf_exts_put_net(struct tcf_exts *exts)
for (; 0; (void)(i), (void)(a), (void)(exts))
#endif
+#define tcf_act_for_each_action(i, a, actions) \
+ for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = actions[i]); i++)
+
static inline void
tcf_exts_stats_update(const struct tcf_exts *exts,
u64 bytes, u64 packets, u64 drops, u64 lastuse,
@@ -536,8 +539,19 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
return ifindex == skb->skb_iif;
}
+#ifdef CONFIG_NET_CLS_ACT
int tc_setup_flow_action(struct flow_action *flow_action,
const struct tcf_exts *exts);
+#else
+static inline int tc_setup_flow_action(struct flow_action *flow_action,
+ const struct tcf_exts *exts)
+{
+ return 0;
+}
+#endif
+
+int tc_setup_action(struct flow_action *flow_action,
+ struct tc_action *actions[]);
void tc_cleanup_flow_action(struct flow_action *flow_action);
int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
@@ -558,6 +572,7 @@ int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
enum tc_setup_type type, void *type_data,
void *cb_priv, u32 *flags, unsigned int *in_hw_count);
unsigned int tcf_exts_num_actions(struct tcf_exts *exts);
+unsigned int tcf_act_num_actions(struct tc_action *actions[]);
#ifdef CONFIG_NET_CLS_ACT
int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
index 715b67f6c62f..0fa2f75cc9b3 100644
--- a/net/core/flow_offload.c
+++ b/net/core/flow_offload.c
@@ -27,6 +27,27 @@ struct flow_rule *flow_rule_alloc(unsigned int num_actions)
}
EXPORT_SYMBOL(flow_rule_alloc);
+struct flow_offload_action *flow_action_alloc(unsigned int num_actions)
+{
+ struct flow_offload_action *fl_action;
+ int i;
+
+ fl_action = kzalloc(struct_size(fl_action, action.entries, num_actions),
+ GFP_KERNEL);
+ if (!fl_action)
+ return NULL;
+
+ fl_action->action.num_entries = num_actions;
+ /* Pre-fill each action hw_stats with DONT_CARE.
+ * Caller can override this if it wants stats for a given action.
+ */
+ for (i = 0; i < num_actions; i++)
+ fl_action->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
+
+ return fl_action;
+}
+EXPORT_SYMBOL(flow_action_alloc);
+
#define FLOW_DISSECTOR_MATCH(__rule, __type, __out) \
const struct flow_match *__m = &(__rule)->match; \
struct flow_dissector *__d = (__m)->dissector; \
@@ -476,6 +497,9 @@ int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
mutex_unlock(&flow_indr_block_lock);
- return list_empty(&bo->cb_list) ? -EOPNOTSUPP : 0;
+ if (bo)
+ return list_empty(&bo->cb_list) ? -EOPNOTSUPP : 0;
+ else
+ return 0;
}
EXPORT_SYMBOL(flow_indr_dev_setup_offload);
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 998a2374f7ae..185f17ea60d5 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1060,6 +1060,36 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
return ERR_PTR(err);
}
+/* offload the tc command after inserted */
+int tcf_action_offload_cmd(struct tc_action *actions[],
+ struct netlink_ext_ack *extack)
+{
+ struct flow_offload_action *fl_act;
+ int err = 0;
+
+ fl_act = flow_action_alloc(tcf_act_num_actions(actions));
+ if (!fl_act)
+ return -ENOMEM;
+
+ fl_act->extack = extack;
+ err = tc_setup_action(&fl_act->action, actions);
+ if (err) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Failed to setup tc actions for offload\n");
+ goto err_out;
+ }
+ fl_act->command = FLOW_ACT_REPLACE;
+
+ flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT, fl_act, NULL, NULL);
+
+ tc_cleanup_flow_action(&fl_act->action);
+
+err_out:
+ kfree(fl_act);
+ return err;
+}
+EXPORT_SYMBOL(tcf_action_offload_cmd);
+
/* Returns numbers of initialized actions or negative error. */
int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
@@ -1514,6 +1544,9 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
return ret;
ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
+ /* offload actions to hardware if possible */
+ tcf_action_offload_cmd(actions, extack);
+
/* only put existing actions */
for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
if (init_res[i] == ACT_P_CREATED)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index c8cb59a11098..9b9770dab5e8 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -3544,8 +3544,8 @@ static enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats)
return hw_stats;
}
-int tc_setup_flow_action(struct flow_action *flow_action,
- const struct tcf_exts *exts)
+int tc_setup_action(struct flow_action *flow_action,
+ struct tc_action *actions[])
{
struct tc_action *act;
int i, j, k, err = 0;
@@ -3554,11 +3554,11 @@ int tc_setup_flow_action(struct flow_action *flow_action,
BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
- if (!exts)
+ if (!actions)
return 0;
j = 0;
- tcf_exts_for_each_action(i, act, exts) {
+ tcf_act_for_each_action(i, act, actions) {
struct flow_action_entry *entry;
entry = &flow_action->entries[j];
@@ -3725,7 +3725,19 @@ int tc_setup_flow_action(struct flow_action *flow_action,
spin_unlock_bh(&act->tcfa_lock);
goto err_out;
}
+EXPORT_SYMBOL(tc_setup_action);
+
+#ifdef CONFIG_NET_CLS_ACT
+int tc_setup_flow_action(struct flow_action *flow_action,
+ const struct tcf_exts *exts)
+{
+ if (!exts)
+ return 0;
+
+ return tc_setup_action(flow_action, exts->actions);
+}
EXPORT_SYMBOL(tc_setup_flow_action);
+#endif
unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
{
@@ -3743,6 +3755,22 @@ unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
}
EXPORT_SYMBOL(tcf_exts_num_actions);
+unsigned int tcf_act_num_actions(struct tc_action *actions[])
+{
+ unsigned int num_acts = 0;
+ struct tc_action *act;
+ int i;
+
+ tcf_act_for_each_action(i, act, actions) {
+ if (is_tcf_pedit(act))
+ num_acts += tcf_pedit_nkeys(act);
+ else
+ num_acts++;
+ }
+ return num_acts;
+}
+EXPORT_SYMBOL(tcf_act_num_actions);
+
#ifdef CONFIG_NET_CLS_ACT
static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
u32 *p_block_index,
--
2.20.1
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