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Date: Thu, 11 Jul 2019 15:13:00 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netfilter-devel@...r.kernel.org, davem@...emloft.net,
netdev@...r.kernel.org, jakub.kicinski@...ronome.com
Subject: Re: [PATCH net-next 3/3] net: flow_offload: add flow_block structure
and use it
On Thu, Jul 11, 2019 at 10:06:09AM +0200, Jiri Pirko wrote:
> Thu, Jul 11, 2019 at 02:12:35AM CEST, pablo@...filter.org wrote:
> >This object stores the flow block callbacks that are attached to this
> >block. This patch restores block sharing.
> >
> >Fixes: da3eeb904ff4 ("net: flow_offload: add list handling functions")
> >Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> >---
> > include/net/flow_offload.h | 5 +++++
> > include/net/netfilter/nf_tables.h | 5 +++--
> > include/net/sch_generic.h | 2 +-
> > net/core/flow_offload.c | 2 +-
> > net/netfilter/nf_tables_api.c | 2 +-
> > net/netfilter/nf_tables_offload.c | 5 +++--
> > net/sched/cls_api.c | 10 +++++++---
> > 7 files changed, 21 insertions(+), 10 deletions(-)
> >
> >diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> >index 98bf3af5c84d..e50d94736829 100644
> >--- a/include/net/flow_offload.h
> >+++ b/include/net/flow_offload.h
> >@@ -248,6 +248,10 @@ enum flow_block_binder_type {
> > FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
> > };
> >
> >+struct flow_block {
> >+ struct list_head cb_list;
> >+};
> >+
> > struct netlink_ext_ack;
> >
> > struct flow_block_offload {
> >@@ -255,6 +259,7 @@ struct flow_block_offload {
> > enum flow_block_binder_type binder_type;
> > bool block_shared;
> > struct net *net;
> >+ struct flow_block *block;
> > struct list_head cb_list;
> > struct list_head *driver_block_list;
> > struct netlink_ext_ack *extack;
> >diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
> >index 35dfdd9f69b3..00658462f89b 100644
> >--- a/include/net/netfilter/nf_tables.h
> >+++ b/include/net/netfilter/nf_tables.h
> >@@ -11,6 +11,7 @@
> > #include <linux/rhashtable.h>
> > #include <net/netfilter/nf_flow_table.h>
> > #include <net/netlink.h>
> >+#include <net/flow_offload.h>
> >
> > struct module;
> >
> >@@ -951,7 +952,7 @@ struct nft_stats {
> > * @stats: per-cpu chain stats
> > * @chain: the chain
> > * @dev_name: device name that this base chain is attached to (if any)
> >- * @cb_list: list of flow block callbacks (for hardware offload)
> >+ * @block: flow block (for hardware offload)
> > */
> > struct nft_base_chain {
> > struct nf_hook_ops ops;
> >@@ -961,7 +962,7 @@ struct nft_base_chain {
> > struct nft_stats __percpu *stats;
> > struct nft_chain chain;
> > char dev_name[IFNAMSIZ];
> >- struct list_head cb_list;
> >+ struct flow_block block;
> > };
> >
> > static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
> >diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> >index 9482e060483b..58041cb0ce15 100644
> >--- a/include/net/sch_generic.h
> >+++ b/include/net/sch_generic.h
> >@@ -399,7 +399,7 @@ struct tcf_block {
> > refcount_t refcnt;
> > struct net *net;
> > struct Qdisc *q;
> >- struct list_head cb_list;
> >+ struct flow_block flow;
>
> It is not a "flow", that is confusing. It should be named "flow_block".
Done.
> > struct list_head owner_list;
> > bool keep_dst;
> > unsigned int offloadcnt; /* Number of oddloaded filters */
> >diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
> >index a800fa78d96c..935c7f81a9ef 100644
> >--- a/net/core/flow_offload.c
> >+++ b/net/core/flow_offload.c
> >@@ -198,7 +198,7 @@ struct flow_block_cb *flow_block_cb_lookup(struct flow_block_offload *f,
> > {
> > struct flow_block_cb *block_cb;
> >
> >- list_for_each_entry(block_cb, f->driver_block_list, driver_list) {
> >+ list_for_each_entry(block_cb, &f->block->cb_list, list) {
>
> Please made struct flow_block *block and argument of cb_lookup instead
> of struct flow_block_offload *f (as it was previously).
I can do so if you insist, this will make this fix larger.
> > if (block_cb->cb == cb &&
> > block_cb->cb_ident == cb_ident)
> > return block_cb;
> >diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> >index ed17a7c29b86..c565f146435b 100644
> >--- a/net/netfilter/nf_tables_api.c
> >+++ b/net/netfilter/nf_tables_api.c
> >@@ -1662,7 +1662,7 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
> >
> > chain->flags |= NFT_BASE_CHAIN | flags;
> > basechain->policy = NF_ACCEPT;
> >- INIT_LIST_HEAD(&basechain->cb_list);
> >+ INIT_LIST_HEAD(&basechain->block.cb_list);
> > } else {
> > chain = kzalloc(sizeof(*chain), GFP_KERNEL);
> > if (chain == NULL)
> >diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
> >index 2c3302845f67..2a184277ee58 100644
> >--- a/net/netfilter/nf_tables_offload.c
> >+++ b/net/netfilter/nf_tables_offload.c
> >@@ -116,7 +116,7 @@ static int nft_setup_cb_call(struct nft_base_chain *basechain,
> > struct flow_block_cb *block_cb;
> > int err;
> >
> >- list_for_each_entry(block_cb, &basechain->cb_list, list) {
> >+ list_for_each_entry(block_cb, &basechain->block.cb_list, list) {
> > err = block_cb->cb(type, type_data, block_cb->cb_priv);
> > if (err < 0)
> > return err;
> >@@ -154,7 +154,7 @@ static int nft_flow_offload_rule(struct nft_trans *trans,
> > static int nft_flow_offload_bind(struct flow_block_offload *bo,
> > struct nft_base_chain *basechain)
> > {
> >- list_splice(&bo->cb_list, &basechain->cb_list);
> >+ list_splice(&bo->cb_list, &basechain->block.cb_list);
> > return 0;
> > }
> >
> >@@ -198,6 +198,7 @@ static int nft_flow_offload_chain(struct nft_trans *trans,
> > return -EOPNOTSUPP;
> >
> > bo.command = cmd;
> >+ bo.block = &basechain->block;
> > bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
> > bo.extack = &extack;
> > INIT_LIST_HEAD(&bo.cb_list);
> >diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
> >index 51fbe6e95a92..66181961ad6f 100644
> >--- a/net/sched/cls_api.c
> >+++ b/net/sched/cls_api.c
> >@@ -691,6 +691,8 @@ static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev,
> > if (!indr_dev->block)
> > return;
> >
> >+ bo.block = &indr_dev->block->flow;
> >+
> > indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
> > &bo);
> > tcf_block_setup(indr_dev->block, &bo);
> >@@ -775,6 +777,7 @@ static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
> > .command = command,
> > .binder_type = ei->binder_type,
> > .net = dev_net(dev),
> >+ .block = &block->flow,
> > .block_shared = tcf_block_shared(block),
> > .extack = extack,
> > };
> >@@ -810,6 +813,7 @@ static int tcf_block_offload_cmd(struct tcf_block *block,
> > bo.net = dev_net(dev);
> > bo.command = command;
> > bo.binder_type = ei->binder_type;
> >+ bo.block = &block->flow;
> > bo.block_shared = tcf_block_shared(block);
> > bo.extack = extack;
> > INIT_LIST_HEAD(&bo.cb_list);
> >@@ -988,7 +992,7 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
> > }
> > mutex_init(&block->lock);
> > INIT_LIST_HEAD(&block->chain_list);
> >- INIT_LIST_HEAD(&block->cb_list);
> >+ INIT_LIST_HEAD(&block->flow.cb_list);
>
> With introduction of struct flow_block, please introduce also a helper
> to init this struct. Does not look right to init it from user codes
> (tc/nft).
Done.
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