Author: mw
Date: Thu May 30 13:31:35 2019
New Revision: 348404
URL: https://svnweb.freebsd.org/changeset/base/348404
Log:
Limit maximum size of Rx refill threshold in ENA
The Rx ring size can be as high as 8k. Because of that we want to limit
the cleanup threshold by maximum value of 256.
Submitted by: Michal Krawczyk <m...@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon, Inc.
Modified:
head/sys/dev/ena/ena.c
head/sys/dev/ena/ena.h
Modified: head/sys/dev/ena/ena.c
==============================================================================
--- head/sys/dev/ena/ena.c Thu May 30 13:30:52 2019 (r348403)
+++ head/sys/dev/ena/ena.c Thu May 30 13:31:35 2019 (r348404)
@@ -1781,7 +1781,9 @@ ena_rx_cleanup(struct ena_ring *rx_ring)
rx_ring->next_to_clean = next_to_clean;
refill_required = ena_com_free_desc(io_sq);
- refill_threshold = rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER;
+ refill_threshold = min_t(int,
+ rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER,
+ ENA_RX_REFILL_THRESH_PACKET);
if (refill_required > refill_threshold) {
ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq);
Modified: head/sys/dev/ena/ena.h
==============================================================================
--- head/sys/dev/ena/ena.h Thu May 30 13:30:52 2019 (r348403)
+++ head/sys/dev/ena/ena.h Thu May 30 13:31:35 2019 (r348404)
@@ -70,7 +70,12 @@
#define ENA_DEFAULT_RING_SIZE 1024
+/*
+ * Refill Rx queue when number of required descriptors is above
+ * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET
+ */
#define ENA_RX_REFILL_THRESH_DIVIDER 8
+#define ENA_RX_REFILL_THRESH_PACKET 256
#define ENA_IRQNAME_SIZE 40
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