Re: [PATCH] gve: set xdp redirect target only when it is available

Hello,

This patch is meant to be destined to the net tree, I forgot to add the prefix when generating the patch. Please disregard this patch; I will post a new version soon.

My apologies, Josh Washington

On Fri, Feb 14, 2025 at 2:38 PM joshwash@google.com wrote:

From: Joshua Washington joshwash@google.com

Before this patch the NETDEV_XDP_ACT_NDO_XMIT XDP feature flag is set by default as part of driver initialization, and is never cleared. However, this flag differs from others in that it is used as an indicator for whether the driver is ready to perform the ndo_xdp_xmit operation as part of an XDP_REDIRECT. Kernel helpers xdp_features_(set|clear)_redirect_target exist to convey this meaning.

This patch ensures that the netdev is only reported as a redirect target when XDP queues exist to forward traffic.

Fixes: 39a7f4aa3e4a ("gve: Add XDP REDIRECT support for GQI-QPL format") Cc: stable@vger.kernel.org Reviewed-by: Praveen Kaligineedi pkaligineedi@google.com Reviewed-by: Jeroen de Borst jeroendb@google.com Signed-off-by: Joshua Washington joshwash@google.com

---

drivers/net/ethernet/google/gve/gve.h | 10 ++++++++++ drivers/net/ethernet/google/gve/gve_main.c | 6 +++++- 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h index 8167cc5fb0df..78d2a19593d1 100644 --- a/drivers/net/ethernet/google/gve/gve.h +++ b/drivers/net/ethernet/google/gve/gve.h @@ -1116,6 +1116,16 @@ static inline u32 gve_xdp_tx_start_queue_id(struct gve_priv *priv) return gve_xdp_tx_queue_id(priv, 0); }

+static inline bool gve_supports_xdp_xmit(struct gve_priv *priv) +{

•   switch (priv->queue_format) {
  

•   case GVE_GQI_QPL_FORMAT:
  

•           return true;
  

•   default:
  

•           return false;
  

•   }
  

+}

/* gqi napi handler defined in gve_main.c */ int gve_napi_poll(struct napi_struct *napi, int budget);

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index 533e659b15b3..92237fb0b60c 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -1903,6 +1903,8 @@ static void gve_turndown(struct gve_priv *priv) /* Stop tx queues */ netif_tx_disable(priv->dev);

•   xdp_features_clear_redirect_target(priv->dev);
  

•   gve_clear_napi_enabled(priv);
    gve_clear_report_stats(priv);
  
  

@@ -1972,6 +1974,9 @@ static void gve_turnup(struct gve_priv *priv) napi_schedule(&block->napi); }

•   if (priv->num_xdp_queues && gve_supports_xdp_xmit(priv))
  

•           xdp_features_set_redirect_target(priv->dev, false);
  

•   gve_set_napi_enabled(priv);
  

}

@@ -2246,7 +2251,6 @@ static void gve_set_netdev_xdp_features(struct gve_priv *priv) if (priv->queue_format == GVE_GQI_QPL_FORMAT) { xdp_features = NETDEV_XDP_ACT_BASIC; xdp_features |= NETDEV_XDP_ACT_REDIRECT;

•           xdp_features |= NETDEV_XDP_ACT_NDO_XMIT;
            xdp_features |= NETDEV_XDP_ACT_XSK_ZEROCOPY;
    } else {
            xdp_features = 0;
  

-- 2.48.1.601.g30ceb7b040-goog