[dpdk-dev] [Bug 721] Wrong event pointer in rx adapter

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=721

            Bug ID: 721
           Summary: Wrong event pointer in rx adapter
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: eventdev
          Assignee: dev@dpdk.org
          Reporter: heng.wang@ericsson.com
  Target Milestone: ---

Problem:
In the function rxa_buffer_mbufs the ev is not reset to the array's first
element before passing to a user call back function. 

Workaround:
In the user callback, we must decrement ev by number of event before we can use
it.

Fix:
I think we should pass &buf->events[buf->count] to dev_info->cb_fn instead of
ev.

 773         for (i = 0; i < num; i++) {
 774                 m = mbufs[i];
 775
 776                 rss = do_rss ?
 777                         rxa_do_softrss(m, rx_adapter->rss_key_be) :
 778                         m->hash.rss;
 779                 ev->event = event;
 780                 ev->flow_id = (rss & ~flow_id_mask) |
 781                                 (ev->flow_id & flow_id_mask);
 782                 ev->mbuf = m;
 783                 ev++;
 784         }
 785
 786         if (dev_info->cb_fn) {
 787
 788                 dropped = 0;
 789                 nb_cb = dev_info->cb_fn(eth_dev_id, rx_queue_id,
 790                                         ETH_EVENT_BUFFER_SIZE, buf->count,
ev,
 791                                         num, dev_info->cb_arg, &dropped);
 792                 if (unlikely(nb_cb > num))
 793                         RTE_EDEV_LOG_ERR("Rx CB returned %d (> %d)
events",
 794                                 nb_cb, num);
 795                 else
 796                         num = nb_cb;
 797                 if (dropped)
 798                         rx_adapter->stats.rx_dropped += dropped;
 799         }

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