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Date: Wed, 4 Feb 2015 14:49:16 -0800
From: Andy Zhou <azhou@...ira.com>
To: dev@...nvswitch.com
Cc: netdev@...r.kernel.org, Andy Zhou <azhou@...ira.com>
Subject: [RFC: add openvswitch actions using BPF 2/9] odp: add a new ODP action: OVS_ACTION_ATTR_BPF_PROG
Add a new ODP action and implements the corresponding Netlink message
handling of this new attribute.
Signed-off-by: Andy Zhou <azhou@...ira.com>
---
datapath/linux/compat/include/linux/openvswitch.h | 29 +++++++++++++++++++-
lib/dpif-netdev.c | 1 +
lib/dpif.c | 1 +
lib/odp-execute.c | 1 +
lib/odp-util.c | 33 +++++++++++++++++++++++
5 files changed, 64 insertions(+), 1 deletion(-)
diff --git a/datapath/linux/compat/include/linux/openvswitch.h b/datapath/linux/compat/include/linux/openvswitch.h
index a59e109..7284023 100644
--- a/datapath/linux/compat/include/linux/openvswitch.h
+++ b/datapath/linux/compat/include/linux/openvswitch.h
@@ -569,6 +569,18 @@ struct ovs_action_push_mpls {
};
/**
+ * struct ovs_action_bpf_prog - %OVS_ACTION_ATTR_BPF_PROG action argument.
+ *
+ * XXX provides bpf program id and execution context.
+ *
+ */
+struct ovs_action_bpf_prog {
+ __be32 prog_fd;
+ __be32 arg0;
+ __be32 arg1;
+};
+
+/**
* struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
* @vlan_tpid: Tag protocol identifier (TPID) to push.
* @vlan_tci: Tag control identifier (TCI) to push. The CFI bit must be set
@@ -685,7 +697,7 @@ enum ovs_action_attr {
* data immediately followed by a mask.
* The data must be zero for the unmasked
* bits. */
-
+ OVS_ACTION_ATTR_BPF_PROG, /* struct ovs_action_bpf_prog. */
#ifndef __KERNEL__
OVS_ACTION_ATTR_TUNNEL_PUSH, /* struct ovs_action_push_tnl*/
OVS_ACTION_ATTR_TUNNEL_POP, /* u32 port number. */
@@ -695,4 +707,19 @@ enum ovs_action_attr {
#define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
+/* integer value in 'imm' field of BPF_CALL instruction selects which OVS helper
+ * function eBPF program intends to call
+ */
+enum ovs_bpf_func_id {
+ OVS_BPF_FUNC_unspec,
+ OVS_BPF_FUNC_output, /* int ovs_bpf_output(ctxt) */
+ __OVS_BPF_FUNC_MAX_ID,
+};
+
+struct ovs_bpf_action_ctxt {
+ void *skb;
+ uint32_t arg0;
+ uint32_t arg1;
+};
+
#endif /* _LINUX_OPENVSWITCH_H */
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 54bad02..e991716 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -3240,6 +3240,7 @@ dp_execute_cb(void *aux_, struct dpif_packet **packets, int cnt,
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_UNSPEC:
+ case OVS_ACTION_ATTR_BPF_PROG:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
diff --git a/lib/dpif.c b/lib/dpif.c
index 6ecd1d9..8aac7dd 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -1132,6 +1132,7 @@ dpif_execute_helper_cb(void *aux_, struct dpif_packet **packets, int cnt,
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_UNSPEC:
+ case OVS_ACTION_ATTR_BPF_PROG:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
diff --git a/lib/odp-execute.c b/lib/odp-execute.c
index 98ac18c..ee06362 100644
--- a/lib/odp-execute.c
+++ b/lib/odp-execute.c
@@ -591,6 +591,7 @@ odp_execute_actions(void *dp, struct dpif_packet **packets, int cnt, bool steal,
break;
case OVS_ACTION_ATTR_UNSPEC:
+ case OVS_ACTION_ATTR_BPF_PROG:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
diff --git a/lib/odp-util.c b/lib/odp-util.c
index 37d73a9..1477d13 100644
--- a/lib/odp-util.c
+++ b/lib/odp-util.c
@@ -88,6 +88,7 @@ odp_action_len(uint16_t type)
case OVS_ACTION_ATTR_SET: return -2;
case OVS_ACTION_ATTR_SET_MASKED: return -2;
case OVS_ACTION_ATTR_SAMPLE: return -2;
+ case OVS_ACTION_ATTR_BPF_PROG: return sizeof(struct ovs_action_bpf_prog);
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
@@ -185,6 +186,17 @@ format_odp_sample_action(struct ds *ds, const struct nlattr *attr)
ds_put_format(ds, "))");
}
+static void
+format_bpf_prog_action(struct ds *ds, const struct nlattr *a)
+{
+ struct ovs_action_bpf_prog *bpf_act = (struct ovs_action_bpf_prog *)
+ nl_attr_get(a);
+
+ ds_put_cstr(ds, "bpf");
+ ds_put_format(ds, "(%u,%u,%u)", ntohl(bpf_act->prog_fd),
+ ntohl(bpf_act->arg0), ntohl(bpf_act->arg1));
+}
+
static const char *
slow_path_reason_to_string(uint32_t reason)
{
@@ -682,6 +694,9 @@ format_odp_action(struct ds *ds, const struct nlattr *a)
case OVS_ACTION_ATTR_SAMPLE:
format_odp_sample_action(ds, a);
break;
+ case OVS_ACTION_ATTR_BPF_PROG:
+ format_bpf_prog_action(ds, a);
+ break;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
default:
@@ -1006,6 +1021,24 @@ parse_odp_action(const char *s, const struct simap *port_names,
return parse_odp_userspace_action(s, actions);
}
+ {
+ struct ovs_action_bpf_prog act_bpf;
+ uint32_t fd;
+ uint32_t arg0, arg1;
+ int n = -1;
+
+ if (ovs_scan(s, "bpf(%"PRIu32",%"PRIu32",%"PRIu32")%n", &fd, &arg0,
+ &arg1, &n)) {
+ memset(&act_bpf, 0, sizeof(act_bpf));
+ act_bpf.prog_fd = htonl(fd);
+ act_bpf.arg0 = htonl(arg0);
+ act_bpf.arg1 = htonl(arg1);
+ nl_msg_put_unspec(actions, OVS_ACTION_ATTR_BPF_PROG,
+ &act_bpf, sizeof(act_bpf));
+ return n;
+ }
+ }
+
if (!strncmp(s, "set(", 4)) {
size_t start_ofs;
int retval;
--
1.9.1
--
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