forked from Minki/linux
net: sched: fw use RCU
RCU'ify fw classifier. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
David S. Miller
parent
ad7a97ae7a
commit
1f31fea5a6
@ -33,17 +33,20 @@
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struct fw_head {
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u32 mask;
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struct fw_filter *ht[HTSIZE];
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struct fw_filter __rcu *ht[HTSIZE];
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struct rcu_head rcu;
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};
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struct fw_filter {
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struct fw_filter *next;
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struct fw_filter __rcu *next;
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u32 id;
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struct tcf_result res;
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#ifdef CONFIG_NET_CLS_IND
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int ifindex;
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#endif /* CONFIG_NET_CLS_IND */
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struct tcf_exts exts;
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struct tcf_proto *tp;
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struct rcu_head rcu;
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};
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static u32 fw_hash(u32 handle)
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@ -56,14 +59,16 @@ static u32 fw_hash(u32 handle)
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static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rcu_dereference_bh(tp->root);
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struct fw_filter *f;
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int r;
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u32 id = skb->mark;
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if (head != NULL) {
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id &= head->mask;
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for (f = head->ht[fw_hash(id)]; f; f = f->next) {
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for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
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f = rcu_dereference_bh(f->next)) {
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if (f->id == id) {
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*res = f->res;
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#ifdef CONFIG_NET_CLS_IND
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@ -92,13 +97,14 @@ static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f;
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if (head == NULL)
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return 0;
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for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
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f = rtnl_dereference(head->ht[fw_hash(handle)]);
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for (; f; f = rtnl_dereference(f->next)) {
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if (f->id == handle)
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return (unsigned long)f;
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}
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@ -114,8 +120,11 @@ static int fw_init(struct tcf_proto *tp)
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return 0;
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}
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static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
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static void fw_delete_filter(struct rcu_head *head)
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{
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struct fw_filter *f = container_of(head, struct fw_filter, rcu);
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struct tcf_proto *tp = f->tp;
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_destroy(tp, &f->exts);
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kfree(f);
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@ -123,7 +132,7 @@ static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
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static void fw_destroy(struct tcf_proto *tp)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f;
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int h;
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@ -131,29 +140,33 @@ static void fw_destroy(struct tcf_proto *tp)
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return;
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for (h = 0; h < HTSIZE; h++) {
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while ((f = head->ht[h]) != NULL) {
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head->ht[h] = f->next;
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fw_delete_filter(tp, f);
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while ((f = rtnl_dereference(head->ht[h])) != NULL) {
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RCU_INIT_POINTER(head->ht[h],
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rtnl_dereference(f->next));
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call_rcu(&f->rcu, fw_delete_filter);
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}
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}
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kfree(head);
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RCU_INIT_POINTER(tp->root, NULL);
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kfree_rcu(head, rcu);
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}
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static int fw_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = (struct fw_filter *)arg;
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struct fw_filter **fp;
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struct fw_filter __rcu **fp;
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struct fw_filter *pfp;
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if (head == NULL || f == NULL)
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goto out;
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for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
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if (*fp == f) {
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tcf_tree_lock(tp);
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*fp = f->next;
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tcf_tree_unlock(tp);
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fw_delete_filter(tp, f);
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fp = &head->ht[fw_hash(f->id)];
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for (pfp = rtnl_dereference(*fp); pfp;
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fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
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if (pfp == f) {
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RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
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call_rcu(&f->rcu, fw_delete_filter);
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return 0;
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}
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}
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@ -171,7 +184,7 @@ static int
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fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
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struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct tcf_exts e;
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u32 mask;
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int err;
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@ -220,7 +233,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
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struct nlattr **tca,
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unsigned long *arg, bool ovr)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = (struct fw_filter *) *arg;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_FW_MAX + 1];
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@ -233,10 +246,42 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
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if (err < 0)
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return err;
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if (f != NULL) {
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if (f) {
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struct fw_filter *pfp, *fnew;
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struct fw_filter __rcu **fp;
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if (f->id != handle && handle)
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return -EINVAL;
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return fw_change_attrs(net, tp, f, tb, tca, base, ovr);
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fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
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if (!fnew)
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return -ENOBUFS;
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fnew->id = f->id;
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fnew->res = f->res;
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#ifdef CONFIG_NET_CLS_IND
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fnew->ifindex = f->ifindex;
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#endif /* CONFIG_NET_CLS_IND */
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fnew->tp = f->tp;
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err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
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if (err < 0) {
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kfree(fnew);
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return err;
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}
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fp = &head->ht[fw_hash(fnew->id)];
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for (pfp = rtnl_dereference(*fp); pfp;
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fp = &pfp->next, pfp = rtnl_dereference(*fp))
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if (pfp == f)
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break;
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RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
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rcu_assign_pointer(*fp, fnew);
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call_rcu(&f->rcu, fw_delete_filter);
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*arg = (unsigned long)fnew;
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return err;
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}
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if (!handle)
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@ -252,9 +297,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
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return -ENOBUFS;
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head->mask = mask;
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tcf_tree_lock(tp);
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tp->root = head;
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tcf_tree_unlock(tp);
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rcu_assign_pointer(tp->root, head);
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}
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f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
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@ -263,15 +306,14 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
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tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
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f->id = handle;
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f->tp = tp;
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err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
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if (err < 0)
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goto errout;
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f->next = head->ht[fw_hash(handle)];
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tcf_tree_lock(tp);
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head->ht[fw_hash(handle)] = f;
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tcf_tree_unlock(tp);
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RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
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rcu_assign_pointer(head->ht[fw_hash(handle)], f);
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*arg = (unsigned long)f;
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return 0;
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@ -283,7 +325,7 @@ errout:
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static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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int h;
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if (head == NULL)
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@ -295,7 +337,8 @@ static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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for (h = 0; h < HTSIZE; h++) {
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struct fw_filter *f;
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for (f = head->ht[h]; f; f = f->next) {
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for (f = rtnl_dereference(head->ht[h]); f;
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f = rtnl_dereference(f->next)) {
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if (arg->count < arg->skip) {
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arg->count++;
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continue;
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@ -312,7 +355,7 @@ static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
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struct sk_buff *skb, struct tcmsg *t)
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{
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struct fw_head *head = tp->root;
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = (struct fw_filter *)fh;
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unsigned char *b = skb_tail_pointer(skb);
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struct nlattr *nest;
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