* If 'may_steal' is false, the caller retains ownership of all the
* packets. If 'may_steal' is true, the caller transfers ownership of
all
* the packets to the network device, regardless of success.
*
* If 'concurrent_txq' is true, the caller may perform concurrent calls
* to netdev_send() with the same 'qid'. The netdev provider is
responsible
* for making sure that these concurrent calls do not create a race
* condition by using locking or other synchronization if required.
*
* The network device is expected to maintain one or more packet
* transmission queues, so that the caller does not ordinarily have to
* do additional queuing of packets. 'qid' specifies the queue to use
* and can be ignored if the implementation does not support multiple
* queues.
*
* May return EOPNOTSUPP if a network device does not implement packet
* transmission through this interface. This function may be set to
null
* if it would always return EOPNOTSUPP anyhow. (This will prevent the
* 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, int qid, struct dp_packet_batch
*batch,
bool may_steal, bool concurrent_txq);
2017-06-21 17:07 GMT+08:00 Joo Kim <[email protected]>:
> Hello experts,
>
> Can somebody help answer?
>
>
> On Fri, Dec 30, 2016 at 3:00 AM, Joo Kim <[email protected]> wrote:
>
> > Hello,
> >
> > I got following gdb backtrace for ovs2.6. And netdev_dpdk_send__()
> > definition is shown at bottom.
> > I try to understand what 'may_steal' is for but not clear yet. Can
> > anybody explain what it is?
> >
> > #0 netdev_dpdk_eth_send (netdev=0x7f235285ed40, qid=0,
> > batch=0x7f2541ff7130, may_steal=true, concurrent_txq=false)
> > at lib/netdev-dpdk.c:1717
> > #1 0x0000000000600392 in netdev_send (netdev=<optimized out>,
> > qid=qid@entry=0, batch=batch@entry=0x7f2541ff7130,
> > may_steal=may_steal@entry=true, concurrent_txq=concurrent_txq@
> entry=false)
> > at lib/netdev.c:718
> > #2 0x00000000005e22e7 in dp_execute_cb (aux_=aux_@entry=
> 0x7f2541ff7090,
> > packets_=packets_@entry=0x7f2541ff7130,
> > a=a@entry=0x7f2541ff7248, may_steal=<optimized out>) at
> > lib/dpif-netdev.c:4433
> > #3 0x000000000060745e in odp_execute_actions (dp=dp@entry
> =0x7f2541ff7090,
> > batch=batch@entry=0x7f2541ff7130,
> > steal=steal@entry=true, actions=<optimized out>,
> > actions_len=<optimized out>,
> > dp_execute_action=dp_execute_action@entry=0x5e20d0
> <dp_execute_cb>)
> > at lib/odp-execute.c:538
> > #4 0x000000000040d28b in dp_netdev_execute_actions (now=3504637714,
> > actions_len=<optimized out>,
> > actions=<optimized out>, flow=0x7f2541ff7640, may_steal=true,
> > packets=0x7f2541ff7130, pmd=0x2e3fe10)
> > at lib/dpif-netdev.c:4634
> > #5 handle_packet_upcall (now=3504637714, lost_cnt=<synthetic pointer>,
> > put_actions=0x7f2541ff70f0,
> > actions=0x7f2541ff70b0, key=0x7f2541ff8448, packet=0x7f235473a440,
> > pmd=0x2e3fe10) at lib/dpif-netdev.c:4071
> >
> >
> >
> >
> >
> >
> > (netdev-dpdk.c)
> >
> > static inline void
> > netdev_dpdk_send__(struct netdev_dpdk *dev, int qid,
> > struct dp_packet_batch *batch, bool may_steal,
> > bool concurrent_txq)
> > {
> > if (OVS_UNLIKELY(concurrent_txq)) {
> > qid = qid % dev->up.n_txq;
> > rte_spinlock_lock(&dev->tx_q[qid].tx_lock);
> > }
> > if (OVS_UNLIKELY(!may_steal ||
> > batch->packets[0]->source != DPBUF_DPDK)) {
> > struct netdev *netdev = &dev->up;
> > dpdk_do_tx_copy(netdev, qid, batch);
> > dp_packet_delete_batch(batch, may_steal);
> > } else {
> >
> >
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