On Wed, Dec 18, 2024 at 05:34:13AM -0800, Praveen Kaligineedi wrote:

From: Joshua Washington joshwash@google.com

This patch predicates the enabling and disabling of XSK pools on the existence of queues. As it stands, if the interface is down, disabling or enabling XSK pools would result in a crash, as the RX queue pointer would be NULL. XSK pool registration will occur as part of the next interface up.

Similarly, xsk_wakeup needs be guarded against queues disappearing while the function is executing, so a check against the GVE_PRIV_FLAGS_NAPI_ENABLED flag is added to synchronize with the disabling of the bit and the synchronize_net() in gve_turndown.

Fixes: fd8e40321a12 ("gve: Add AF_XDP zero-copy support for GQI-QPL format") Cc: stable@vger.kernel.org Signed-off-by: Joshua Washington joshwash@google.com Signed-off-by: Praveen Kaligineedi pkaligineedi@google.com Reviewed-by: Praveen Kaligineedi pkaligineedi@google.com Reviewed-by: Shailend Chand shailend@google.com Reviewed-by: Willem de Bruijn willemb@google.com

I think the sender's SoB still should be last, but otherwise looks good.

Reviewed-by: Larysa Zaremba larysa.zaremba@intel.com

---

drivers/net/ethernet/google/gve/gve_main.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index 5d7b0cc59959..e4e8ff4f9f80 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -1623,8 +1623,8 @@ static int gve_xsk_pool_enable(struct net_device *dev, if (err) return err;

• /* If XDP prog is not installed, return */
• if (!priv->xdp_prog)

• /* If XDP prog is not installed or interface is down, return. */
• if (!priv->xdp_prog || !netif_running(dev)) return 0;

rx = &priv->rx[qid]; @@ -1669,21 +1669,16 @@ static int gve_xsk_pool_disable(struct net_device *dev, if (qid >= priv->rx_cfg.num_queues) return -EINVAL;

• /* If XDP prog is not installed, unmap DMA and return */
• if (!priv->xdp_prog)

• /* If XDP prog is not installed or interface is down, unmap DMA and

• * return.
  

• */
  

• if (!priv->xdp_prog || !netif_running(dev)) goto done;

• tx_qid = gve_xdp_tx_queue_id(priv, qid);
• if (!netif_running(dev)) {

• priv->rx[qid].xsk_pool = NULL;
  

• xdp_rxq_info_unreg(&priv->rx[qid].xsk_rxq);
  

• priv->tx[tx_qid].xsk_pool = NULL;
  

• goto done;
  

• }
• napi_rx = &priv->ntfy_blocks[priv->rx[qid].ntfy_id].napi; napi_disable(napi_rx); /* make sure current rx poll is done */

• tx_qid = gve_xdp_tx_queue_id(priv, qid); napi_tx = &priv->ntfy_blocks[priv->tx[tx_qid].ntfy_id].napi; napi_disable(napi_tx); /* make sure current tx poll is done */

@@ -1711,6 +1706,9 @@ static int gve_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) struct gve_priv *priv = netdev_priv(dev); int tx_queue_id = gve_xdp_tx_queue_id(priv, queue_id);

• if (!gve_get_napi_enabled(priv))

• return -ENETDOWN;
  

• if (queue_id >= priv->rx_cfg.num_queues || !priv->xdp_prog) return -EINVAL;

2.47.1.613.gc27f4b7a9f-goog