virtio-net: initial rx sysfs support, export mergeable rx buffer size

Add initial support for per-rx queue sysfs attributes to virtio-net. If
mergeable packet buffers are enabled, adds a read-only mergeable packet
buffer size sysfs attribute for each RX queue.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 4 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index dacd43b276d4..d75f8edf4fb3 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -600,18 +600,25 @@ static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
         return err;
 }
 
-static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
+static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len)
 {
         const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+        unsigned int len;
+
+        len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len),
+                        GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
+        return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
+}
+
+static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
+{
         struct page_frag *alloc_frag = &rq->alloc_frag;
         char *buf;
         unsigned long ctx;
         int err;
         unsigned int len, hole;
 
-        len = hdr_len + clamp_t(unsigned int, ewma_read(&rq->mrg_avg_pkt_len),
-                                GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
-        len = ALIGN(len, MERGEABLE_BUFFER_ALIGN);
+        len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
         if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
                 return -ENOMEM;
 
@@ -1584,6 +1591,33 @@ err:
         return ret;
 }
 
+#ifdef CONFIG_SYSFS
+static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
+                struct rx_queue_attribute *attribute, char *buf)
+{
+        struct virtnet_info *vi = netdev_priv(queue->dev);
+        unsigned int queue_index = get_netdev_rx_queue_index(queue);
+        struct ewma *avg;
+
+        BUG_ON(queue_index >= vi->max_queue_pairs);
+        avg = &vi->rq[queue_index].mrg_avg_pkt_len;
+        return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
+}
+
+static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
+        __ATTR_RO(mergeable_rx_buffer_size);
+
+static struct attribute *virtio_net_mrg_rx_attrs[] = {
+        &mergeable_rx_buffer_size_attribute.attr,
+        NULL
+};
+
+static const struct attribute_group virtio_net_mrg_rx_group = {
+        .name = "virtio_net",
+        .attrs = virtio_net_mrg_rx_attrs
+};
+#endif
+
 static int virtnet_probe(struct virtio_device *vdev)
 {
         int i, err;
@@ -1698,6 +1732,10 @@ static int virtnet_probe(struct virtio_device *vdev)
         if (err)
                 goto free_stats;
 
+#ifdef CONFIG_SYSFS
+        if (vi->mergeable_rx_bufs)
+                dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
+#endif
         netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
         netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);