net/ngbe: add simple Rx flow

[dpdk.git] / drivers / net / af_xdp / rte_eth_af_xdp.c

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index c2db21f..74ffa45 100644 (file)
--- 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"
 
@@ -272,8 +273,18 @@ af_xdp_rx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
        nb_pkts = xsk_ring_cons__peek(rx, nb_pkts, &idx_rx);
 
        if (nb_pkts == 0) {
-               rx_syscall_handler(&rxq->fq, rxq->busy_budget, &rxq->fds[0],
-                                  rxq->xsk);
+               /* we can assume a kernel >= 5.11 is in use if busy polling is
+                * enabled and thus we can safely use the recvfrom() syscall
+                * which is only supported for AF_XDP sockets in kernels >=
+                * 5.11.
+                */
+               if (rxq->busy_budget) {
+                       (void)recvfrom(xsk_socket__fd(rxq->xsk), NULL, 0,
+                                      MSG_DONTWAIT, NULL, NULL);
+               } else if (xsk_ring_prod__needs_wakeup(fq)) {
+                       (void)poll(&rxq->fds[0], 1, 1000);
+               }
+
                return 0;
        }
 
@@ -778,6 +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)
 {
@@ -1438,6 +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 */