[dpdk-dev] [PATCH] event/octeontx: handle partial receive packets

[pbhagavatula at marvell.com]

From: Pavan Nikhilesh <pbhagavatula at marvell.com>

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.

Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
---
 drivers/event/octeontx/ssovf_worker.h        | 17 +++++++++++++++--
 drivers/net/octeontx/base/octeontx_pki_var.h |  2 +-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/event/octeontx/ssovf_worker.h b/drivers/event/octeontx/ssovf_worker.h
index d1d3a52ae..9c715d389 100644
--- 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 ((get_work0 & 0xFFFFFFFF) == 0xFFFFFFFF) {
+		ssovf_octeontx_wqe_free(get_work1);
+		return 0;
 	} else {
 		ev->u64 = get_work1;
 	}
diff --git a/drivers/net/octeontx/base/octeontx_pki_var.h b/drivers/net/octeontx/base/octeontx_pki_var.h
index f4661d24e..2ef98964b 100644
--- a/drivers/net/octeontx/base/octeontx_pki_var.h
+++ b/drivers/net/octeontx/base/octeontx_pki_var.h
@@ -139,7 +139,7 @@ typedef union octtx_wqe_s {
 			uint64_t	l2b	: 1;
 			uint64_t	l2m	: 1;
 			uint64_t	raw	: 1;
-	uint64_t	err_lev : 3;
+			uint64_t	err_lev : 3;
 			uint64_t	op_code : 8;
 		} w2;
 
-- 
2.17.1