[ovs-dev,v7,05/10] dpif: Add support to set user features
diff mbox series

Message ID 1577009803-4331-6-git-send-email-paulb@mellanox.com
State Accepted
Delegated to: Simon Horman
Headers show
Series
  • Add support for offloading CT datapath rules to TC
Related show

Commit Message

Paul Blakey Dec. 22, 2019, 10:16 a.m. UTC
This enables user features on the kernel datapath via the DP_CMD_SET
command, and also retrieves them to check for actual support and
not just an older kernel ignoring the requested features.

This will be used in next patch to enable recirc_id sharing with tc.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>

---

Changelog:

V3->V4:
    Removed dpif pointer passing in offload info (not needed, and
    compilation issue fix)
V2->V3:
    Refactored commit, to move it earlier
    Renamed commit from "netdev-offloads-tc: Probe recirc tc sharing feature on first recirc_id rule"
---
 datapath/linux/compat/include/linux/openvswitch.h |  3 ++
 lib/dpif-netdev.c                                 |  1 +
 lib/dpif-netlink.c                                | 52 +++++++++++++++++++++--
 lib/dpif-provider.h                               |  2 +
 lib/dpif.c                                        |  9 ++++
 lib/dpif.h                                        |  2 +
 6 files changed, 66 insertions(+), 3 deletions(-)

Patch
diff mbox series

diff --git a/datapath/linux/compat/include/linux/openvswitch.h b/datapath/linux/compat/include/linux/openvswitch.h
index 778827f..b9a7faa 100644
--- a/datapath/linux/compat/include/linux/openvswitch.h
+++ b/datapath/linux/compat/include/linux/openvswitch.h
@@ -143,6 +143,9 @@  struct ovs_vport_stats {
 /* Allow datapath to associate multiple Netlink PIDs to each vport */
 #define OVS_DP_F_VPORT_PIDS	(1 << 1)
 
+/* Allow tc offload recirc sharing */
+#define OVS_DP_F_TC_RECIRC_SHARING  (1 << 2)
+
 /* Fixed logical ports. */
 #define OVSP_LOCAL      ((__u32)0)
 
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 3f21211..fd8280a 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -7627,6 +7627,7 @@  const struct dpif_class dpif_netdev_class = {
     dpif_netdev_run,
     dpif_netdev_wait,
     dpif_netdev_get_stats,
+    NULL,                      /* set_features */
     dpif_netdev_port_add,
     dpif_netdev_port_del,
     dpif_netdev_port_set_config,
diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c
index e9a6887..ef06dd4 100644
--- a/lib/dpif-netlink.c
+++ b/lib/dpif-netlink.c
@@ -193,6 +193,7 @@  struct dpif_handler {
 struct dpif_netlink {
     struct dpif dpif;
     int dp_ifindex;
+    uint32_t user_features;
 
     /* Upcall messages. */
     struct fat_rwlock upcall_lock;
@@ -334,15 +335,26 @@  dpif_netlink_open(const struct dpif_class *class OVS_UNUSED, const char *name,
 
     /* Create or look up datapath. */
     dpif_netlink_dp_init(&dp_request);
+    upcall_pid = 0;
+    dp_request.upcall_pid = &upcall_pid;
+    dp_request.name = name;
+
     if (create) {
         dp_request.cmd = OVS_DP_CMD_NEW;
-        upcall_pid = 0;
-        dp_request.upcall_pid = &upcall_pid;
     } else {
+        dp_request.cmd = OVS_DP_CMD_GET;
+
+        error = dpif_netlink_dp_transact(&dp_request, &dp, &buf);
+        if (error) {
+            return error;
+        }
+        dp_request.user_features = dp.user_features;
+        ofpbuf_delete(buf);
+
         /* Use OVS_DP_CMD_SET to report user features */
         dp_request.cmd = OVS_DP_CMD_SET;
     }
-    dp_request.name = name;
+
     dp_request.user_features |= OVS_DP_F_UNALIGNED;
     dp_request.user_features |= OVS_DP_F_VPORT_PIDS;
     error = dpif_netlink_dp_transact(&dp_request, &dp, &buf);
@@ -368,6 +380,7 @@  open_dpif(const struct dpif_netlink_dp *dp, struct dpif **dpifp)
               dp->dp_ifindex, dp->dp_ifindex);
 
     dpif->dp_ifindex = dp->dp_ifindex;
+    dpif->user_features = dp->user_features;
     *dpifp = &dpif->dpif;
 
     return 0;
@@ -664,6 +677,31 @@  dpif_netlink_get_stats(const struct dpif *dpif_, struct dpif_dp_stats *stats)
     return error;
 }
 
+static int
+dpif_netlink_set_features(struct dpif *dpif_, uint32_t new_features)
+{
+    struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
+    struct dpif_netlink_dp request, reply;
+    struct ofpbuf *bufp;
+    int error;
+
+    dpif_netlink_dp_init(&request);
+    request.cmd = OVS_DP_CMD_SET;
+    request.dp_ifindex = dpif->dp_ifindex;
+    request.user_features = dpif->user_features | new_features;
+
+    error = dpif_netlink_dp_transact(&request, &reply, &bufp);
+    if (!error) {
+        dpif->user_features = reply.user_features;
+        ofpbuf_delete(bufp);
+        if (!(dpif->user_features & new_features)) {
+            return -EOPNOTSUPP;
+        }
+    }
+
+    return error;
+}
+
 static const char *
 get_vport_type(const struct dpif_netlink_vport *vport)
 {
@@ -3885,6 +3923,7 @@  const struct dpif_class dpif_netlink_class = {
     dpif_netlink_run,
     NULL,                       /* wait */
     dpif_netlink_get_stats,
+    dpif_netlink_set_features,
     dpif_netlink_port_add,
     dpif_netlink_port_del,
     NULL,                       /* port_set_config */
@@ -4202,6 +4241,9 @@  dpif_netlink_dp_from_ofpbuf(struct dpif_netlink_dp *dp, const struct ofpbuf *buf
         [OVS_DP_ATTR_MEGAFLOW_STATS] = {
                         NL_POLICY_FOR(struct ovs_dp_megaflow_stats),
                         .optional = true },
+        [OVS_DP_ATTR_USER_FEATURES] = {
+                        .type = NL_A_U32,
+                        .optional = true },
     };
 
     dpif_netlink_dp_init(dp);
@@ -4230,6 +4272,10 @@  dpif_netlink_dp_from_ofpbuf(struct dpif_netlink_dp *dp, const struct ofpbuf *buf
         dp->megaflow_stats = nl_attr_get(a[OVS_DP_ATTR_MEGAFLOW_STATS]);
     }
 
+    if (a[OVS_DP_ATTR_USER_FEATURES]) {
+        dp->user_features = nl_attr_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
+    }
+
     return 0;
 }
 
diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index f8ca310..b77317b 100644
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -188,6 +188,8 @@  struct dpif_class {
     /* Retrieves statistics for 'dpif' into 'stats'. */
     int (*get_stats)(const struct dpif *dpif, struct dpif_dp_stats *stats);
 
+    int (*set_features)(struct dpif *dpif, uint32_t user_features);
+
     /* Adds 'netdev' as a new port in 'dpif'.  If '*port_no' is not
      * ODPP_NONE, attempts to use that as the port's port number.
      *
diff --git a/lib/dpif.c b/lib/dpif.c
index c88b210..dc13655 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -543,6 +543,15 @@  dpif_get_dp_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
     return error;
 }
 
+int
+dpif_set_features(struct dpif *dpif, uint32_t new_features)
+{
+    int error = dpif->dpif_class->set_features(dpif, new_features);
+
+    log_operation(dpif, "set_features", error);
+    return error;
+}
+
 const char *
 dpif_port_open_type(const char *datapath_type, const char *port_type)
 {
diff --git a/lib/dpif.h b/lib/dpif.h
index d96f854..dfa7f2a 100644
--- a/lib/dpif.h
+++ b/lib/dpif.h
@@ -435,6 +435,8 @@  struct dpif_dp_stats {
 };
 int dpif_get_dp_stats(const struct dpif *, struct dpif_dp_stats *);
 
+int dpif_set_features(struct dpif *, uint32_t new_features);
+
 
 /* Port operations. */