[ovs-dev] [PATCH RFC ovs 06/14] dpif-netdev: Add HW miss packet state recover logic
Eli Britstein
elibr at nvidia.com
Wed Dec 9 13:48:24 UTC 2020
Recover the packet if it was partially processed by the HW. Fallback to
lookup flow by mark association.
Signed-off-by: Eli Britstein <elibr at nvidia.com>
---
lib/dpif-netdev.c | 46 ++++++++++++++++++++++++++++++----------------
1 file changed, 30 insertions(+), 16 deletions(-)
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 3645479ad..06335612d 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -6994,6 +6994,10 @@ smc_lookup_batch(struct dp_netdev_pmd_thread *pmd,
pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_SMC_HIT, n_smc_hit);
}
+static struct tx_port *
+pmd_send_port_cache_lookup(const struct dp_netdev_pmd_thread *pmd,
+ odp_port_t port_no);
+
/* Try to process all ('cnt') the 'packets' using only the datapath flow cache
* 'pmd->flow_cache'. If a flow is not found for a packet 'packets[i]', the
* miniflow is copied into 'keys' and the packet pointer is moved at the
@@ -7057,23 +7061,33 @@ dfc_processing(struct dp_netdev_pmd_thread *pmd,
pkt_metadata_init(&packet->md, port_no);
}
- if ((*recirc_depth_get() == 0) &&
- dp_packet_has_flow_mark(packet, &mark)) {
- flow = mark_to_flow_find(pmd, mark);
- if (OVS_LIKELY(flow)) {
- tcp_flags = parse_tcp_flags(packet);
- if (OVS_LIKELY(batch_enable)) {
- dp_netdev_queue_batches(packet, flow, tcp_flags, batches,
- n_batches);
- } else {
- /* Flow batching should be performed only after fast-path
- * processing is also completed for packets with emc miss
- * or else it will result in reordering of packets with
- * same datapath flows. */
- packet_enqueue_to_flow_map(packet, flow, tcp_flags,
- flow_map, map_cnt++);
+ if (*recirc_depth_get() == 0) {
+ /* Restore the packet if HW processing was terminated before
+ * completion.
+ */
+ struct tx_port *p;
+
+ tcp_flags = parse_tcp_flags(packet);
+ p = pmd_send_port_cache_lookup(pmd, port_no);
+ if (!p || netdev_hw_miss_packet_recover(p->port->netdev, packet)) {
+ if (dp_packet_has_flow_mark(packet, &mark)) {
+ flow = mark_to_flow_find(pmd, mark);
+ if (OVS_LIKELY(flow)) {
+ if (OVS_LIKELY(batch_enable)) {
+ dp_netdev_queue_batches(packet, flow, tcp_flags,
+ batches, n_batches);
+ } else {
+ /* Flow batching should be performed only after
+ * fast-path processing is also completed for
+ * packets with emc miss or else it will result in
+ * reordering of packets with same datapath flows.
+ */
+ packet_enqueue_to_flow_map(packet, flow, tcp_flags,
+ flow_map, map_cnt++);
+ }
+ continue;
+ }
}
- continue;
}
}
--
2.28.0.546.g385c171
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