net: introduce NAPI_POLL_WEIGHT

Some drivers use a too big NAPI poll weight.

This patch adds a NAPI_POLL_WEIGHT default value
and issues an error message if a driver attempts
to use a bigger weight.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index a06a7a58dd11..96103894ad69 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4057,6 +4057,9 @@ void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
         napi->gro_list = NULL;
         napi->skb = NULL;
         napi->poll = poll;
+        if (weight > NAPI_POLL_WEIGHT)
+                pr_err_once("netif_napi_add() called with weight %d on device %s\n",
+                            weight, dev->name);
         napi->weight = weight;
         list_add(&napi->dev_list, &dev->napi_list);
         napi->dev = dev;