[ovs-dev] [PATCH 2/9] netdev: Send ofpuf directly to netdev.

Pravin pshelar at nicira.com
Tue Mar 18 20:53:11 UTC 2014


DPDK netdev need to access ofpbuf while sending buffer. Following
patch changes netdev_send accordingly.

Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
---
 lib/dpif-netdev.c     |    9 +++++----
 lib/netdev-dummy.c    |    7 ++++++-
 lib/netdev-linux.c    |    9 ++++++++-
 lib/netdev-provider.h |   14 +++++++-------
 lib/netdev.c          |    4 ++--
 lib/netdev.h          |    2 +-
 6 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index d78fb25..440561e 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -1806,7 +1806,7 @@ dp_execute_cb(void *aux_, struct ofpbuf *packet,
     case OVS_ACTION_ATTR_OUTPUT:
         p = dp_netdev_lookup_port(aux->dp, u32_to_odp(nl_attr_get_u32(a)));
         if (p) {
-            netdev_send(p->netdev, packet);
+            netdev_send(p->netdev, packet, may_steal);
         }
         break;
 
@@ -1817,6 +1817,10 @@ dp_execute_cb(void *aux_, struct ofpbuf *packet,
 
         dp_netdev_output_userspace(aux->dp, packet, DPIF_UC_ACTION, aux->key,
                                    userdata);
+
+        if (may_steal) {
+            ofpbuf_delete(packet);
+        }
         break;
     }
     case OVS_ACTION_ATTR_PUSH_VLAN:
@@ -1830,9 +1834,6 @@ dp_execute_cb(void *aux_, struct ofpbuf *packet,
         OVS_NOT_REACHED();
     }
 
-    if (may_steal) {
-        ofpbuf_delete(packet);
-    }
 }
 
 static void
diff --git a/lib/netdev-dummy.c b/lib/netdev-dummy.c
index 27487f9..7c73ca6 100644
--- a/lib/netdev-dummy.c
+++ b/lib/netdev-dummy.c
@@ -817,9 +817,11 @@ netdev_dummy_rx_drain(struct netdev_rx *rx_)
 }
 
 static int
-netdev_dummy_send(struct netdev *netdev, const void *buffer, size_t size)
+netdev_dummy_send(struct netdev *netdev, struct ofpbuf *pkt, bool may_steal)
 {
     struct netdev_dummy *dev = netdev_dummy_cast(netdev);
+    const void *buffer = pkt->data;
+    size_t size = pkt->size;
 
     if (size < ETH_HEADER_LEN) {
         return EMSGSIZE;
@@ -854,6 +856,9 @@ netdev_dummy_send(struct netdev *netdev, const void *buffer, size_t size)
     }
 
     ovs_mutex_unlock(&dev->mutex);
+    if (may_steal) {
+        ofpbuf_delete(pkt);
+    }
 
     return 0;
 }
diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 574a572..a6e2217 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -1049,8 +1049,11 @@ netdev_linux_rx_drain(struct netdev_rx *rx_)
  * The kernel maintains a packet transmission queue, so the caller is not
  * expected to do additional queuing of packets. */
 static int
-netdev_linux_send(struct netdev *netdev_, const void *data, size_t size)
+netdev_linux_send(struct netdev *netdev_, struct ofpbuf *pkt, bool may_steal)
 {
+    const void *data = pkt->data;
+    size_t size = pkt->size;
+
     for (;;) {
         ssize_t retval;
 
@@ -1122,6 +1125,10 @@ netdev_linux_send(struct netdev *netdev_, const void *data, size_t size)
             return 0;
         }
     }
+
+    if (may_steal) {
+        ofpbuf_delete(pkt);
+    }
 }
 
 /* Registers with the poll loop to wake up from the next call to poll_block()
diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h
index 9bacaa0..90700db 100644
--- a/lib/netdev-provider.h
+++ b/lib/netdev-provider.h
@@ -223,13 +223,13 @@ struct netdev_class {
     const struct netdev_tunnel_config *
         (*get_tunnel_config)(const struct netdev *netdev);
 
-    /* Sends the 'size'-byte packet in 'buffer' on 'netdev'.  Returns 0 if
-     * successful, otherwise a positive errno value.  Returns EAGAIN without
-     * blocking if the packet cannot be queued immediately.  Returns EMSGSIZE
-     * if a partial packet was transmitted or if the packet is too big or too
-     * small to transmit on the device.
+    /* Sends the buffer->data of size buffer->sizefrom 'buffer' on 'netdev'.
+     * Returns 0 if successful, otherwise a positive errno value.  Returns
+     * EAGAIN without blocking if the packet cannot be queued immediately.
+     * Returns EMSGSIZE if a partial packet was transmitted or if the packet
+     * is too big or too small to transmit on the device.
      *
-     * The caller retains ownership of 'buffer' in all cases.
+     * The caller retains ownership of 'buffer' if may_steal is true.
      *
      * The network device is expected to maintain a packet transmission queue,
      * so that the caller does not ordinarily have to do additional queuing of
@@ -241,7 +241,7 @@ struct netdev_class {
      * network device from being usefully used by the netdev-based "userspace
      * datapath".  It will also prevent the OVS implementation of bonding from
      * working properly over 'netdev'.) */
-    int (*send)(struct netdev *netdev, const void *buffer, size_t size);
+    int (*send)(struct netdev *netdev, struct ofpbuf *buffer, bool may_steal);
 
     /* Registers with the poll loop to wake up from the next call to
      * poll_block() when the packet transmission queue for 'netdev' has
diff --git a/lib/netdev.c b/lib/netdev.c
index a058742..295e121 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -610,12 +610,12 @@ netdev_rx_drain(struct netdev_rx *rx)
  * Some network devices may not implement support for this function.  In such
  * cases this function will always return EOPNOTSUPP. */
 int
-netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
+netdev_send(struct netdev *netdev, struct ofpbuf *buffer, bool may_steal)
 {
     int error;
 
     error = (netdev->netdev_class->send
-             ? netdev->netdev_class->send(netdev, buffer->data, buffer->size)
+             ? netdev->netdev_class->send(netdev, buffer, may_steal)
              : EOPNOTSUPP);
     if (!error) {
         COVERAGE_INC(netdev_sent);
diff --git a/lib/netdev.h b/lib/netdev.h
index bfd8f91..2b4e2a9 100644
--- a/lib/netdev.h
+++ b/lib/netdev.h
@@ -166,7 +166,7 @@ void netdev_rx_wait(struct netdev_rx *);
 int netdev_rx_drain(struct netdev_rx *);
 
 /* Packet transmission. */
-int netdev_send(struct netdev *, const struct ofpbuf *);
+int netdev_send(struct netdev *, struct ofpbuf *, bool may_steal);
 void netdev_send_wait(struct netdev *);
 
 /* Hardware address. */
-- 
1.7.9.5




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