[PATCH net-next 4/4] virtio_net: Remove rtnl lock protection of command buffers
From: Daniel Jurgens <hidden>
Date: 2024-03-25 21:49:52
Also in:
virtualization
Subsystem:
networking drivers, the rest, virtio net driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
The rtnl lock is no longer needed to protect the control buffer and command VQ. Signed-off-by: Daniel Jurgens <redacted> Reviewed-by: Jiri Pirko <redacted> --- drivers/net/virtio_net.c | 27 +++++---------------------- 1 file changed, 5 insertions(+), 22 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 41f8dc16ff38..d09ea20b16be 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c@@ -2639,14 +2639,12 @@ static void virtnet_stats(struct net_device *dev, static void virtnet_ack_link_announce(struct virtnet_info *vi) { - rtnl_lock(); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); - rtnl_unlock(); } -static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) +static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) { struct virtio_net_ctrl_mq *mq __free(kfree) = NULL; struct scatterlist sg;
@@ -2677,16 +2675,6 @@ static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) return 0; } -static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) -{ - int err; - - rtnl_lock(); - err = _virtnet_set_queues(vi, queue_pairs); - rtnl_unlock(); - return err; -} - static int virtnet_close(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev);
@@ -3268,7 +3256,7 @@ static int virtnet_set_channels(struct net_device *dev, return -EINVAL; cpus_read_lock(); - err = _virtnet_set_queues(vi, queue_pairs); + err = virtnet_set_queues(vi, queue_pairs); if (err) { cpus_read_unlock(); goto err;
@@ -3558,14 +3546,11 @@ static void virtnet_rx_dim_work(struct work_struct *work) struct dim_cq_moder update_moder; int i, qnum, err; - if (!rtnl_trylock()) - return; - /* Each rxq's work is queued by "net_dim()->schedule_work()" * in response to NAPI traffic changes. Note that dim->profile_ix * for each rxq is updated prior to the queuing action. * So we only need to traverse and update profiles for all rxqs - * in the work which is holding rtnl_lock. + * in the work. */ for (i = 0; i < vi->curr_queue_pairs; i++) { rq = &vi->rq[i];
@@ -3587,8 +3572,6 @@ static void virtnet_rx_dim_work(struct work_struct *work) dim->state = DIM_START_MEASURE; } } - - rtnl_unlock(); } static int virtnet_coal_params_supported(struct ethtool_coalesce *ec)
@@ -4036,7 +4019,7 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, synchronize_net(); } - err = _virtnet_set_queues(vi, curr_qp + xdp_qp); + err = virtnet_set_queues(vi, curr_qp + xdp_qp); if (err) goto err; netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
@@ -4852,7 +4835,7 @@ static int virtnet_probe(struct virtio_device *vdev) virtio_device_ready(vdev); - _virtnet_set_queues(vi, vi->curr_queue_pairs); + virtnet_set_queues(vi, vi->curr_queue_pairs); /* a random MAC address has been assigned, notify the device. * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
--
2.42.0