net: sparx5: fix FDMA performance issue

[ Upstream commit f004f2e535e2b66ccbf5ac35f8eaadeac70ad7b7 ]

The FDMA handler is responsible for scheduling a NAPI poll, which will
eventually fetch RX packets from the FDMA queue. Currently, the FDMA
handler is run in a threaded context. For some reason, this kills
performance.  Admittedly, I did not do a thorough investigation to see
exactly what causes the issue, however, I noticed that in the other
driver utilizing the same FDMA engine, we run the FDMA handler in hard
IRQ context.

Fix this performance issue, by  running the FDMA handler in hard IRQ
context, not deferring any work to a thread.

Prior to this change, the RX UDP performance was:

Interval           Transfer     Bitrate         Jitter
0.00-10.20  sec    44.6 MBytes  36.7 Mbits/sec  0.027 ms

After this change, the rx UDP performance is:

Interval           Transfer     Bitrate         Jitter
0.00-9.12   sec    1.01 GBytes  953 Mbits/sec   0.020 ms

Fixes: 10615907e9b5 ("net: sparx5: switchdev: adding frame DMA functionality")
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index 7031f41287e0948a0451696167238061c77cd49c..1ed69e77b89584015b5bc8fba70f9f71a0d917c9 100644 (file)
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -680,12 +680,11 @@ static int sparx5_start(struct sparx5 *sparx5)
        err = -ENXIO;
        if (sparx5->fdma_irq >= 0) {
                if (GCB_CHIP_ID_REV_ID_GET(sparx5->chip_id) > 0)
-                       err = devm_request_threaded_irq(sparx5->dev,
-                                                       sparx5->fdma_irq,
-                                                       NULL,
-                                                       sparx5_fdma_handler,
-                                                       IRQF_ONESHOT,
-                                                       "sparx5-fdma", sparx5);
+                       err = devm_request_irq(sparx5->dev,
+                                              sparx5->fdma_irq,
+                                              sparx5_fdma_handler,
+                                              0,
+                                              "sparx5-fdma", sparx5);
                if (!err)
                        err = sparx5_fdma_start(sparx5);
                if (err)