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From: Anatoly Burakov <anatoly.burakov@intel.com>
To: dev@dpdk.org, Ciara Loftus <ciara.loftus@intel.com>,
Qi Zhang <qi.z.zhang@intel.com>
Cc: konstantin.ananyev@intel.com,
david.hunt@intel.com
Date: Wed, 7 Jul 2021 10:48:15 +0000
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Subject: [dpdk-dev] [PATCH v7 2/7] net/af_xdp: add power monitor support
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Implement support for .get_monitor_addr in AF_XDP driver.
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
Notes:
v2:
- Rewrite using the callback mechanism
drivers/net/af_xdp/rte_eth_af_xdp.c | 34 +++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index eb5660a3dc..7830d0c23a 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -37,6 +37,7 @@
#include <rte_malloc.h>
#include <rte_ring.h>
#include <rte_spinlock.h>
+#include <rte_power_intrinsics.h>
#include "compat.h"
@@ -788,6 +789,38 @@ eth_dev_configure(struct rte_eth_dev *dev)
return 0;
}
+#define CLB_VAL_IDX 0
+static int
+eth_monitor_callback(const uint64_t value,
+ const uint64_t opaque[RTE_POWER_MONITOR_OPAQUE_SZ])
+{
+ const uint64_t v = opaque[CLB_VAL_IDX];
+ const uint64_t m = (uint32_t)~0;
+
+ /* if the value has changed, abort entering power optimized state */
+ return (value & m) == v ? 0 : -1;
+}
+
+static int
+eth_get_monitor_addr(void *rx_queue, struct rte_power_monitor_cond *pmc)
+{
+ struct pkt_rx_queue *rxq = rx_queue;
+ unsigned int *prod = rxq->rx.producer;
+ const uint32_t cur_val = rxq->rx.cached_prod; /* use cached value */
+
+ /* watch for changes in producer ring */
+ pmc->addr = (void*)prod;
+
+ /* store current value */
+ pmc->opaque[CLB_VAL_IDX] = cur_val;
+ pmc->fn = eth_monitor_callback;
+
+ /* AF_XDP producer ring index is 32-bit */
+ pmc->size = sizeof(uint32_t);
+
+ return 0;
+}
+
static int
eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
{
@@ -1448,6 +1481,7 @@ static const struct eth_dev_ops ops = {
.link_update = eth_link_update,
.stats_get = eth_stats_get,
.stats_reset = eth_stats_reset,
+ .get_monitor_addr = eth_get_monitor_addr
};
/** parse busy_budget argument */
--
2.25.1