dpaa2-eth: use bulk enqueue in .ndo_xdp_xmit

Take advantage of the bulk enqueue feature in .ndo_xdp_xmit.
We cannot use the XDP_XMIT_FLUSH since the architecture is not capable
to store all the frames dequeued in a NAPI cycle so we instead are
enqueueing all the frames received in a ndo_xdp_xmit call right away.

After setting up all FDs for the xdp_frames received, enqueue multiple
frames at a time until all are sent or the maximum number of retries is
hit.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 9a0432c..9d4061b 100644 (file)
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -1933,12 +1933,12 @@ static int dpaa2_eth_xdp_xmit(struct net_device *net_dev, int n,
                              struct xdp_frame **frames, u32 flags)
 {
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+       int total_enqueued = 0, retries = 0, enqueued;
        struct dpaa2_eth_drv_stats *percpu_extras;
        struct rtnl_link_stats64 *percpu_stats;
+       int num_fds, i, err, max_retries;
        struct dpaa2_eth_fq *fq;
-       struct dpaa2_fd fd;
-       int drops = 0;
-       int i, err;
+       struct dpaa2_fd *fds;
 
        if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
                return -EINVAL;
@@ -1946,41 +1946,40 @@ static int dpaa2_eth_xdp_xmit(struct net_device *net_dev, int n,
        if (!netif_running(net_dev))
                return -ENETDOWN;
 
+       fq = &priv->fq[smp_processor_id()];
+       fds = fq->xdp_fds;
+
        percpu_stats = this_cpu_ptr(priv->percpu_stats);
        percpu_extras = this_cpu_ptr(priv->percpu_extras);
 
+       /* create a FD for each xdp_frame in the list received */
        for (i = 0; i < n; i++) {
-               struct xdp_frame *xdpf = frames[i];
-
-               /* create the FD from the xdp_frame */
-               err = dpaa2_eth_xdp_create_fd(net_dev, xdpf, &fd);
-               if (err) {
-                       percpu_stats->tx_dropped++;
-                       xdp_return_frame_rx_napi(xdpf);
-                       drops++;
-                       continue;
-               }
-
-               /* enqueue the newly created FD */
-               fq = &priv->fq[smp_processor_id() % dpaa2_eth_queue_count(priv)];
-               for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
-                       err = priv->enqueue(priv, fq, &fd, 0, 1);
-                       if (err != -EBUSY)
-                               break;
-               }
+               err = dpaa2_eth_xdp_create_fd(net_dev, frames[i], &fds[i]);
+               if (err)
+                       break;
+       }
+       num_fds = i;
 
-               percpu_extras->tx_portal_busy += i;
-               if (unlikely(err < 0)) {
-                       percpu_stats->tx_errors++;
-                       xdp_return_frame_rx_napi(xdpf);
+       /* try to enqueue all the FDs until the max number of retries is hit */
+       max_retries = num_fds * DPAA2_ETH_ENQUEUE_RETRIES;
+       while (total_enqueued < num_fds && retries < max_retries) {
+               err = priv->enqueue(priv, fq, &fds[total_enqueued],
+                                   0, num_fds - total_enqueued, &enqueued);
+               if (err == -EBUSY) {
+                       percpu_extras->tx_portal_busy += ++retries;
                        continue;
                }
-
-               percpu_stats->tx_packets++;
-               percpu_stats->tx_bytes += dpaa2_fd_get_len(&fd);
+               total_enqueued += enqueued;
        }
 
-       return n - drops;
+       /* update statistics */
+       percpu_stats->tx_packets += total_enqueued;
+       for (i = 0; i < total_enqueued; i++)
+               percpu_stats->tx_bytes += dpaa2_fd_get_len(&fds[i]);
+       for (i = total_enqueued; i < n; i++)
+               xdp_return_frame_rx_napi(frames[i]);
+
+       return total_enqueued;
 }
 
 static int update_xps(struct dpaa2_eth_priv *priv)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index 2440ba6..2890530 100644 (file)
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -325,6 +325,8 @@ struct dpaa2_eth_fq {
                        const struct dpaa2_fd *fd,
                        struct dpaa2_eth_fq *fq);
        struct dpaa2_eth_fq_stats stats;
+
+       struct dpaa2_fd xdp_fds[DEV_MAP_BULK_SIZE];
 };
 
 struct dpaa2_eth_ch_xdp {