From: Quentin Monnet <quentin.monnet@netronome.com>
Date: Fri, 19 Jan 2018 17:44:47 -0800
Subject: net: sched: add extack support for offload via tc_cls_common_offload
Patch-mainline: v4.16-rc1
Git-commit: 8f0b425a712b82732127ff7880f92504f20fcc11
References: bsc#1109837

Add extack support for hardware offload of classifiers. In order
to achieve this, a pointer to a struct netlink_ext_ack is added to the
struct tc_cls_common_offload that is passed to the callback for setting
up the classifier. Function tc_cls_common_offload_init() is updated to
support initialization of this new attribute.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/pkt_cls.h    |    5 ++++-
 net/sched/cls_bpf.c      |    4 ++--
 net/sched/cls_flower.c   |    6 +++---
 net/sched/cls_matchall.c |    4 ++--
 net/sched/cls_u32.c      |    8 ++++----
 5 files changed, 15 insertions(+), 12 deletions(-)

--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -602,15 +602,18 @@ struct tc_cls_common_offload {
 	u32 chain_index;
 	__be16 protocol;
 	u32 prio;
+	struct netlink_ext_ack *extack;
 };
 
 static inline void
 tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common,
-			   const struct tcf_proto *tp)
+			   const struct tcf_proto *tp,
+			   struct netlink_ext_ack *extack)
 {
 	cls_common->chain_index = tp->chain->index;
 	cls_common->protocol = tp->protocol;
 	cls_common->prio = tp->prio;
+	cls_common->extack = extack;
 }
 
 struct tc_cls_u32_knode {
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -159,7 +159,7 @@ static int cls_bpf_offload_cmd(struct tc
 	skip_sw = prog && tc_skip_sw(prog->gen_flags);
 	obj = prog ?: oldprog;
 
-	tc_cls_common_offload_init(&cls_bpf.common, tp);
+	tc_cls_common_offload_init(&cls_bpf.common, tp, extack);
 	cls_bpf.command = TC_CLSBPF_OFFLOAD;
 	cls_bpf.exts = &obj->exts;
 	cls_bpf.prog = prog ? prog->filter : NULL;
@@ -227,7 +227,7 @@ static void cls_bpf_offload_update_stats
 	struct tcf_block *block = tp->chain->block;
 	struct tc_cls_bpf_offload cls_bpf = {};
 
-	tc_cls_common_offload_init(&cls_bpf.common, tp);
+	tc_cls_common_offload_init(&cls_bpf.common, tp, NULL);
 	cls_bpf.command = TC_CLSBPF_STATS;
 	cls_bpf.exts = &prog->exts;
 	cls_bpf.prog = prog->filter;
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -222,7 +222,7 @@ static void fl_hw_destroy_filter(struct
 	struct tc_cls_flower_offload cls_flower = {};
 	struct tcf_block *block = tp->chain->block;
 
-	tc_cls_common_offload_init(&cls_flower.common, tp);
+	tc_cls_common_offload_init(&cls_flower.common, tp, NULL);
 	cls_flower.command = TC_CLSFLOWER_DESTROY;
 	cls_flower.cookie = (unsigned long) f;
 
@@ -242,7 +242,7 @@ static int fl_hw_replace_filter(struct t
 	bool skip_sw = tc_skip_sw(f->flags);
 	int err;
 
-	tc_cls_common_offload_init(&cls_flower.common, tp);
+	tc_cls_common_offload_init(&cls_flower.common, tp, extack);
 	cls_flower.command = TC_CLSFLOWER_REPLACE;
 	cls_flower.cookie = (unsigned long) f;
 	cls_flower.dissector = dissector;
@@ -271,7 +271,7 @@ static void fl_hw_update_stats(struct tc
 	struct tc_cls_flower_offload cls_flower = {};
 	struct tcf_block *block = tp->chain->block;
 
-	tc_cls_common_offload_init(&cls_flower.common, tp);
+	tc_cls_common_offload_init(&cls_flower.common, tp, NULL);
 	cls_flower.command = TC_CLSFLOWER_STATS;
 	cls_flower.cookie = (unsigned long) f;
 	cls_flower.exts = &f->exts;
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -76,7 +76,7 @@ static void mall_destroy_hw_filter(struc
 	struct tc_cls_matchall_offload cls_mall = {};
 	struct tcf_block *block = tp->chain->block;
 
-	tc_cls_common_offload_init(&cls_mall.common, tp);
+	tc_cls_common_offload_init(&cls_mall.common, tp, NULL);
 	cls_mall.command = TC_CLSMATCHALL_DESTROY;
 	cls_mall.cookie = cookie;
 
@@ -94,7 +94,7 @@ static int mall_replace_hw_filter(struct
 	bool skip_sw = tc_skip_sw(head->flags);
 	int err;
 
-	tc_cls_common_offload_init(&cls_mall.common, tp);
+	tc_cls_common_offload_init(&cls_mall.common, tp, extack);
 	cls_mall.command = TC_CLSMATCHALL_REPLACE;
 	cls_mall.exts = &head->exts;
 	cls_mall.cookie = cookie;
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -492,7 +492,7 @@ static void u32_clear_hw_hnode(struct tc
 	struct tcf_block *block = tp->chain->block;
 	struct tc_cls_u32_offload cls_u32 = {};
 
-	tc_cls_common_offload_init(&cls_u32.common, tp);
+	tc_cls_common_offload_init(&cls_u32.common, tp, NULL);
 	cls_u32.command = TC_CLSU32_DELETE_HNODE;
 	cls_u32.hnode.divisor = h->divisor;
 	cls_u32.hnode.handle = h->handle;
@@ -510,7 +510,7 @@ static int u32_replace_hw_hnode(struct t
 	bool offloaded = false;
 	int err;
 
-	tc_cls_common_offload_init(&cls_u32.common, tp);
+	tc_cls_common_offload_init(&cls_u32.common, tp, extack);
 	cls_u32.command = TC_CLSU32_NEW_HNODE;
 	cls_u32.hnode.divisor = h->divisor;
 	cls_u32.hnode.handle = h->handle;
@@ -535,7 +535,7 @@ static void u32_remove_hw_knode(struct t
 	struct tcf_block *block = tp->chain->block;
 	struct tc_cls_u32_offload cls_u32 = {};
 
-	tc_cls_common_offload_init(&cls_u32.common, tp);
+	tc_cls_common_offload_init(&cls_u32.common, tp, NULL);
 	cls_u32.command = TC_CLSU32_DELETE_KNODE;
 	cls_u32.knode.handle = n->handle;
 
@@ -551,7 +551,7 @@ static int u32_replace_hw_knode(struct t
 	bool skip_sw = tc_skip_sw(flags);
 	int err;
 
-	tc_cls_common_offload_init(&cls_u32.common, tp);
+	tc_cls_common_offload_init(&cls_u32.common, tp, extack);
 	cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 	cls_u32.knode.handle = n->handle;
 	cls_u32.knode.fshift = n->fshift;