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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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067a7cd06f
Alexey reported that we have GFP_KERNEL allocation when holding the spinlock tcf_lock. Actually we don't have to take that spinlock for all the cases, especially for the new one we just create. To modify the existing actions, we still need this spinlock to make sure the whole update is atomic. For net-next, we can get rid of this spinlock because we already hold the RTNL lock on slow path, and on fast path we can use RCU to protect the metalist. Joint work with Jamal. Reported-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
#ifndef __NET_TC_IFE_H
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#define __NET_TC_IFE_H
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#include <net/act_api.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#define IFE_METAHDRLEN 2
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struct tcf_ife_info {
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struct tcf_common common;
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u8 eth_dst[ETH_ALEN];
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u8 eth_src[ETH_ALEN];
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u16 eth_type;
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u16 flags;
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/* list of metaids allowed */
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struct list_head metalist;
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};
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#define to_ife(a) \
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container_of(a->priv, struct tcf_ife_info, common)
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struct tcf_meta_info {
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const struct tcf_meta_ops *ops;
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void *metaval;
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u16 metaid;
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struct list_head metalist;
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};
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struct tcf_meta_ops {
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u16 metaid; /*Maintainer provided ID */
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u16 metatype; /*netlink attribute type (look at net/netlink.h) */
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const char *name;
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const char *synopsis;
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struct list_head list;
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int (*check_presence)(struct sk_buff *, struct tcf_meta_info *);
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int (*encode)(struct sk_buff *, void *, struct tcf_meta_info *);
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int (*decode)(struct sk_buff *, void *, u16 len);
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int (*get)(struct sk_buff *skb, struct tcf_meta_info *mi);
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int (*alloc)(struct tcf_meta_info *, void *, gfp_t);
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void (*release)(struct tcf_meta_info *);
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int (*validate)(void *val, int len);
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struct module *owner;
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};
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#define MODULE_ALIAS_IFE_META(metan) MODULE_ALIAS("ifemeta" __stringify_1(metan))
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int ife_get_meta_u32(struct sk_buff *skb, struct tcf_meta_info *mi);
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int ife_get_meta_u16(struct sk_buff *skb, struct tcf_meta_info *mi);
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int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
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const void *dval);
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int ife_alloc_meta_u32(struct tcf_meta_info *mi, void *metaval, gfp_t gfp);
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int ife_alloc_meta_u16(struct tcf_meta_info *mi, void *metaval, gfp_t gfp);
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int ife_check_meta_u32(u32 metaval, struct tcf_meta_info *mi);
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int ife_encode_meta_u32(u32 metaval, void *skbdata, struct tcf_meta_info *mi);
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int ife_validate_meta_u32(void *val, int len);
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int ife_validate_meta_u16(void *val, int len);
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void ife_release_meta_gen(struct tcf_meta_info *mi);
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int register_ife_op(struct tcf_meta_ops *mops);
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int unregister_ife_op(struct tcf_meta_ops *mops);
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#endif /* __NET_TC_IFE_H */
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