event/octeontx: fix partial Rx packet handling

When net/octeontx is connected to event/octeontx as an event Rx adapter,
PKI aka 'net/octeontx' can forward packets directly to SSO aka
'event/octeontx'.
When pumping traffic to PKI if flow control is disabled internal FIFOs
might be overrun causing partial l2 packets to be enqueued.
SSO receives <31:0> TAG tag calculated by PKI, in normal cases <31:28>
is always 0 which signifies RTE_EVENT_TYPE_ETHDEV. But in case of
partial received packets PKI sets the <31:0> TAG as 0xFFFFFFFF which
is an invalid event type.

Add a check to see if TAG is 0xFFFFFFFF and free the partial receive
packet.

Fixes: d0d654986018 ("net/octeontx: support event Rx adapter")
Cc: stable@dpdk.org
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

diff --git a/drivers/event/octeontx/ssovf_worker.h b/drivers/event/octeontx/ssovf_worker.h
index d1d3a52..c4f886d 100644 (file)
--- a/drivers/event/octeontx/ssovf_worker.h
+++ b/drivers/event/octeontx/ssovf_worker.h
@@ -30,8 +30,7 @@ ssovf_octeontx_wqe_to_pkt(uint64_t work, uint16_t port_info)
        octtx_wqe_t *wqe = (octtx_wqe_t *)(uintptr_t)work;
 
        /* Get mbuf from wqe */
-       mbuf = (struct rte_mbuf *)((uintptr_t)wqe -
-                       OCTTX_PACKET_WQE_SKIP);
+       mbuf = (struct rte_mbuf *)((uintptr_t)wqe - OCTTX_PACKET_WQE_SKIP);
        rte_prefetch_non_temporal(mbuf);
        mbuf->packet_type =
                ptype_table[wqe->s.w2.lcty][wqe->s.w2.lety][wqe->s.w2.lfty];
@@ -46,6 +45,16 @@ ssovf_octeontx_wqe_to_pkt(uint64_t work, uint16_t port_info)
        return mbuf;
 }
 
+static __rte_always_inline void
+ssovf_octeontx_wqe_free(uint64_t work)
+{
+       octtx_wqe_t *wqe = (octtx_wqe_t *)(uintptr_t)work;
+       struct rte_mbuf *mbuf;
+
+       mbuf = (struct rte_mbuf *)((uintptr_t)wqe - OCTTX_PACKET_WQE_SKIP);
+       rte_pktmbuf_free(mbuf);
+}
+
 static __rte_always_inline uint16_t
 ssows_get_work(struct ssows *ws, struct rte_event *ev)
 {
@@ -59,9 +68,13 @@ ssows_get_work(struct ssows *ws, struct rte_event *ev)
        ws->cur_grp = sched_type_queue >> 2;
        sched_type_queue = sched_type_queue << 38;
        ev->event = sched_type_queue | (get_work0 & 0xffffffff);
+
        if (get_work1 && ev->event_type == RTE_EVENT_TYPE_ETHDEV) {
                ev->mbuf = ssovf_octeontx_wqe_to_pkt(get_work1,
                                (ev->event >> 20) & 0x7F);
+       } else if (unlikely((get_work0 & 0xFFFFFFFF) == 0xFFFFFFFF)) {
+               ssovf_octeontx_wqe_free(get_work1);
+               return 0;
        } else {
                ev->u64 = get_work1;
        }