netdev - Re: [PATCH net-next v4 1/3] flow_offload: move tc indirect block to flow offload

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Date:   Mon, 29 Jul 2019 13:13:50 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     wenxu@...oud.cn
Cc:     pablo@...filter.org, fw@...len.de, jakub.kicinski@...ronome.com,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/3] flow_offload: move tc indirect block to
 flow offload

Sun, Jul 28, 2019 at 08:52:47AM CEST, wenxu@...oud.cn wrote:
>From: wenxu <wenxu@...oud.cn>
>
>move tc indirect block to flow_offload and rename
>it to flow indirect block.The nf_tables can use the
>indr block architecture.
>
>Signed-off-by: wenxu <wenxu@...oud.cn>
>---
>v3: subsys_initcall for init_flow_indr_rhashtable
>v4: no change
>

[...]


>diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
>index 00b9aab..66f89bc 100644
>--- a/include/net/flow_offload.h
>+++ b/include/net/flow_offload.h
>@@ -4,6 +4,7 @@
> #include <linux/kernel.h>
> #include <linux/list.h>
> #include <net/flow_dissector.h>
>+#include <linux/rhashtable.h>
> 
> struct flow_match {
> 	struct flow_dissector	*dissector;
>@@ -366,4 +367,42 @@ static inline void flow_block_init(struct flow_block *flow_block)
> 	INIT_LIST_HEAD(&flow_block->cb_list);
> }
> 
>+typedef int flow_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
>+				      enum tc_setup_type type, void *type_data);
>+
>+struct flow_indr_block_cb {
>+	struct list_head list;
>+	void *cb_priv;
>+	flow_indr_block_bind_cb_t *cb;
>+	void *cb_ident;
>+};

I don't understand why are you pushing this struct out of the c file to
the header. Please don't.


>+
>+typedef void flow_indr_block_ing_cmd_t(struct net_device *dev,
>+				       struct flow_block *flow_block,
>+				       struct flow_indr_block_cb *indr_block_cb,
>+				       enum flow_block_command command);
>+
>+struct flow_indr_block_dev {
>+	struct rhash_head ht_node;
>+	struct net_device *dev;
>+	unsigned int refcnt;
>+	struct list_head cb_list;
>+	flow_indr_block_ing_cmd_t *ing_cmd_cb;
>+	struct flow_block *flow_block;

I don't understand why are you pushing this struct out of the c file to
the header. Please don't.


>+};
>+
>+struct flow_indr_block_dev *flow_indr_block_dev_lookup(struct net_device *dev);
>+
>+int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
>+				  flow_indr_block_bind_cb_t *cb, void *cb_ident);
>+
>+void __flow_indr_block_cb_unregister(struct net_device *dev,
>+				     flow_indr_block_bind_cb_t *cb, void *cb_ident);
>+
>+int flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
>+				flow_indr_block_bind_cb_t *cb, void *cb_ident);
>+
>+void flow_indr_block_cb_unregister(struct net_device *dev,
>+				   flow_indr_block_bind_cb_t *cb, void *cb_ident);
>+
	
[...]

	
>+
>+int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
>+				  flow_indr_block_bind_cb_t *cb,
>+				  void *cb_ident)
>+{
>+	struct flow_indr_block_cb *indr_block_cb;
>+	struct flow_indr_block_dev *indr_dev;
>+	int err;
>+
>+	indr_dev = flow_indr_block_dev_get(dev);
>+	if (!indr_dev)
>+		return -ENOMEM;
>+
>+	indr_block_cb = flow_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
>+	err = PTR_ERR_OR_ZERO(indr_block_cb);
>+	if (err)
>+		goto err_dev_put;
>+
>+	if (indr_dev->ing_cmd_cb)
>+		indr_dev->ing_cmd_cb(indr_dev->dev, indr_dev->flow_block, indr_block_cb,

This line is over 80cols. Please run checkpatch script for your patch
and obey the warnings.


>+				     FLOW_BLOCK_BIND);
>+
>+	return 0;
>+
>+err_dev_put:
>+	flow_indr_block_dev_put(indr_dev);
>+	return err;
>+}
>+EXPORT_SYMBOL_GPL(__flow_indr_block_cb_register);

[...]


> 
>-static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev,
>-				  struct tc_indr_block_cb *indr_block_cb,
>+static void tc_indr_block_ing_cmd(struct net_device *dev,

I don't understand why you change struct tc_indr_block_dev * to
struct net_device * here. If you want to do that, please do that in a
separate patch, not it this one where only "the move" should happen.


>+				  struct flow_block *flow_block,
>+				  struct flow_indr_block_cb *indr_block_cb,
> 				  enum flow_block_command command)
> {
>+	struct tcf_block *block = flow_block ?
>+				  container_of(flow_block,
>+					       struct tcf_block,
>+					       flow_block) : NULL;
> 	struct flow_block_offload bo = {
> 		.command	= command,
> 		.binder_type	= FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
>-		.net		= dev_net(indr_dev->dev),
>-		.block_shared	= tcf_block_non_null_shared(indr_dev->block),
>+		.net		= dev_net(dev),
>+		.block_shared	= tcf_block_non_null_shared(block),
> 	};
> 	INIT_LIST_HEAD(&bo.cb_list);
> 

[...]