From ca7105f278b3f7bd2c6f2b336c928f679054de4d Mon Sep 17 00:00:00 2001 From: Joe Stringer Date: Mon, 8 Sep 2014 13:09:37 -0700 Subject: [PATCH] openvswitch: Refactor ovs_flow_cmd_fill_info(). Split up ovs_flow_cmd_fill_info() to make it easier to cache parts of a dump reply. This will be used to streamline flow_dump in a future patch. Signed-off-by: Joe Stringer Acked-by: Thomas Graf Signed-off-by: Pravin B Shelar --- net/openvswitch/datapath.c | 93 +++++++++++++++++++++++++++----------- 1 file changed, 66 insertions(+), 27 deletions(-) diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 04a26ae4a4f6..bbb920bf48da 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -674,58 +674,67 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) } /* Called with ovs_mutex or RCU read lock. */ -static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, - struct sk_buff *skb, u32 portid, - u32 seq, u32 flags, u8 cmd) +static int ovs_flow_cmd_fill_match(const struct sw_flow *flow, + struct sk_buff *skb) { - const int skb_orig_len = skb->len; - struct nlattr *start; - struct ovs_flow_stats stats; - __be16 tcp_flags; - unsigned long used; - struct ovs_header *ovs_header; struct nlattr *nla; int err; - ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); - if (!ovs_header) - return -EMSGSIZE; - - ovs_header->dp_ifindex = dp_ifindex; - /* Fill flow key. */ nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); if (!nla) - goto nla_put_failure; + return -EMSGSIZE; err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); if (err) - goto error; + return err; + nla_nest_end(skb, nla); + /* Fill flow mask. */ nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); if (!nla) - goto nla_put_failure; + return -EMSGSIZE; err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); if (err) - goto error; + return err; nla_nest_end(skb, nla); + return 0; +} + +/* Called with ovs_mutex or RCU read lock. */ +static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, + struct sk_buff *skb) +{ + struct ovs_flow_stats stats; + __be16 tcp_flags; + unsigned long used; ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); if (used && nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) - goto nla_put_failure; + return -EMSGSIZE; if (stats.n_packets && nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) - goto nla_put_failure; + return -EMSGSIZE; if ((u8)ntohs(tcp_flags) && nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) - goto nla_put_failure; + return -EMSGSIZE; + + return 0; +} + +/* Called with ovs_mutex or RCU read lock. */ +static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, + struct sk_buff *skb, int skb_orig_len) +{ + struct nlattr *start; + int err; /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if * this is the first flow to be dumped into 'skb'. This is unusual for @@ -749,17 +758,47 @@ static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, nla_nest_end(skb, start); else { if (skb_orig_len) - goto error; + return err; nla_nest_cancel(skb, start); } - } else if (skb_orig_len) - goto nla_put_failure; + } else if (skb_orig_len) { + return -EMSGSIZE; + } + + return 0; +} + +/* Called with ovs_mutex or RCU read lock. */ +static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, + struct sk_buff *skb, u32 portid, + u32 seq, u32 flags, u8 cmd) +{ + const int skb_orig_len = skb->len; + struct ovs_header *ovs_header; + int err; + + ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, + flags, cmd); + if (!ovs_header) + return -EMSGSIZE; + + ovs_header->dp_ifindex = dp_ifindex; + + err = ovs_flow_cmd_fill_match(flow, skb); + if (err) + goto error; + + err = ovs_flow_cmd_fill_stats(flow, skb); + if (err) + goto error; + + err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); + if (err) + goto error; return genlmsg_end(skb, ovs_header); -nla_put_failure: - err = -EMSGSIZE; error: genlmsg_cancel(skb, ovs_header); return err; -- 2.30.2