Message ID | 20220124075955.1232426-1-imagedong@tencent.com (mailing list archive) |
---|---|
State | Superseded |
Delegated to: | Netdev Maintainers |
Headers | show |
Series | [net-next] net: drop_monitor: support drop reason | expand |
On Mon, 24 Jan 2022 15:59:55 +0800 menglong8.dong@gmail.com wrote: > @@ -606,6 +608,7 @@ static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, > static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, > size_t payload_len) > { > + enum skb_drop_reason reason = NET_DM_SKB_CB(skb)->reason; > u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; nit: maybe it's better to get a pointer to struct net_dm_skb_cb here instead of local var for each field? > char buf[NET_DM_MAX_SYMBOL_LEN]; > struct nlattr *attr; > @@ -623,6 +626,9 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, > if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) > goto nla_put_failure; > > + if (nla_put_u32(msg, NET_DM_ATTR_REASON, reason)) > + goto nla_put_failure;
On Wed, Jan 26, 2022 at 11:38 AM Jakub Kicinski <kuba@kernel.org> wrote: > > On Mon, 24 Jan 2022 15:59:55 +0800 menglong8.dong@gmail.com wrote: > > @@ -606,6 +608,7 @@ static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, > > static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, > > size_t payload_len) > > { > > + enum skb_drop_reason reason = NET_DM_SKB_CB(skb)->reason; > > u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; > > nit: maybe it's better to get a pointer to struct net_dm_skb_cb here > instead of local var for each field? Yeah, I think it's a good idea :/ > > > char buf[NET_DM_MAX_SYMBOL_LEN]; > > struct nlattr *attr; > > @@ -623,6 +626,9 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, > > if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) > > goto nla_put_failure; > > > > + if (nla_put_u32(msg, NET_DM_ATTR_REASON, reason)) > > + goto nla_put_failure;
diff --git a/include/uapi/linux/net_dropmon.h b/include/uapi/linux/net_dropmon.h index 66048cc5d7b3..b2815166dbc2 100644 --- a/include/uapi/linux/net_dropmon.h +++ b/include/uapi/linux/net_dropmon.h @@ -93,6 +93,7 @@ enum net_dm_attr { NET_DM_ATTR_SW_DROPS, /* flag */ NET_DM_ATTR_HW_DROPS, /* flag */ NET_DM_ATTR_FLOW_ACTION_COOKIE, /* binary */ + NET_DM_ATTR_REASON, /* u32 */ __NET_DM_ATTR_MAX, NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1 diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c index 7b288a121a41..4aed0e583770 100644 --- a/net/core/drop_monitor.c +++ b/net/core/drop_monitor.c @@ -126,6 +126,7 @@ struct net_dm_skb_cb { struct devlink_trap_metadata *hw_metadata; void *pc; }; + enum skb_drop_reason reason; }; #define NET_DM_SKB_CB(__skb) ((struct net_dm_skb_cb *)&((__skb)->cb[0])) @@ -508,6 +509,7 @@ static void net_dm_packet_trace_kfree_skb_hit(void *ignore, if (!nskb) return; + NET_DM_SKB_CB(nskb)->reason = reason; NET_DM_SKB_CB(nskb)->pc = location; /* Override the timestamp because we care about the time when the * packet was dropped. @@ -606,6 +608,7 @@ static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, size_t payload_len) { + enum skb_drop_reason reason = NET_DM_SKB_CB(skb)->reason; u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; char buf[NET_DM_MAX_SYMBOL_LEN]; struct nlattr *attr; @@ -623,6 +626,9 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) goto nla_put_failure; + if (nla_put_u32(msg, NET_DM_ATTR_REASON, reason)) + goto nla_put_failure; + snprintf(buf, sizeof(buf), "%pS", NET_DM_SKB_CB(skb)->pc); if (nla_put_string(msg, NET_DM_ATTR_SYMBOL, buf)) goto nla_put_failure;