[ovs-dev] [Q]what is 'may_steal' for in netdev API?
Joo Kim
itsolution at gmail.com
Wed Jun 21 09:07:20 UTC 2017
Hello experts,
Can somebody help answer?
On Fri, Dec 30, 2016 at 3:00 AM, Joo Kim <itsolution at gmail.com> 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 at entry=0, batch=batch at entry=0x7f2541ff7130,
> may_steal=may_steal at entry=true, concurrent_txq=concurrent_txq at entry=false)
> at lib/netdev.c:718
> #2 0x00000000005e22e7 in dp_execute_cb (aux_=aux_ at entry=0x7f2541ff7090,
> packets_=packets_ at entry=0x7f2541ff7130,
> a=a at entry=0x7f2541ff7248, may_steal=<optimized out>) at
> lib/dpif-netdev.c:4433
> #3 0x000000000060745e in odp_execute_actions (dp=dp at entry=0x7f2541ff7090,
> batch=batch at entry=0x7f2541ff7130,
> steal=steal at entry=true, actions=<optimized out>,
> actions_len=<optimized out>,
> dp_execute_action=dp_execute_action at 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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