net: remove support for per driver ndo_busy_poll()

We added generic support for busy polling in NAPI layer in linux-4.5

No network driver uses ndo_busy_poll() anymore, we can get rid
of the pointer in struct net_device_ops, and its use in sk_busy_loop()

Saves NETIF_F_BUSY_POLL features bit.

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

4 files changed, 0 insertions, 21 deletions

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 9c6c8ef2e9e7..9a0419594e84 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -71,7 +71,6 @@ enum {
         NETIF_F_HW_VLAN_STAG_RX_BIT,    /* Receive VLAN STAG HW acceleration */
         NETIF_F_HW_VLAN_STAG_FILTER_BIT,/* Receive filtering on VLAN STAGs */
         NETIF_F_HW_L2FW_DOFFLOAD_BIT,   /* Allow L2 Forwarding in Hardware */
-        NETIF_F_BUSY_POLL_BIT,          /* Busy poll */
 
         NETIF_F_HW_TC_BIT,              /* Offload TC infrastructure */
 
@@ -134,7 +133,6 @@ enum {
 #define NETIF_F_HW_VLAN_STAG_RX __NETIF_F(HW_VLAN_STAG_RX)
 #define NETIF_F_HW_VLAN_STAG_TX __NETIF_F(HW_VLAN_STAG_TX)
 #define NETIF_F_HW_L2FW_DOFFLOAD        __NETIF_F(HW_L2FW_DOFFLOAD)
-#define NETIF_F_BUSY_POLL       __NETIF_F(BUSY_POLL)
 #define NETIF_F_HW_TC           __NETIF_F(HW_TC)
 
 #define for_each_netdev_feature(mask_addr, bit) \
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f3878fbe7786..6f18b509fb2f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1185,9 +1185,6 @@ struct net_device_ops {
                                                      struct netpoll_info *info);
         void                    (*ndo_netpoll_cleanup)(struct net_device *dev);
 #endif
-#ifdef CONFIG_NET_RX_BUSY_POLL
-        int                     (*ndo_busy_poll)(struct napi_struct *dev);
-#endif
         int                     (*ndo_set_vf_mac)(struct net_device *dev,
                                                   int queue, u8 *mac);
         int                     (*ndo_set_vf_vlan)(struct net_device *dev,
diff --git a/net/core/dev.c b/net/core/dev.c
index 727b6fda0e8c..4cde8bfb9bab 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4978,7 +4978,6 @@ bool sk_busy_loop(struct sock *sk, int nonblock)
 {
         unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0;
         int (*napi_poll)(struct napi_struct *napi, int budget);
-        int (*busy_poll)(struct napi_struct *dev);
         void *have_poll_lock = NULL;
         struct napi_struct *napi;
         int rc;
@@ -4993,17 +4992,10 @@ restart:
         if (!napi)
                 goto out;
 
-        /* Note: ndo_busy_poll method is optional in linux-4.5 */
-        busy_poll = napi->dev->netdev_ops->ndo_busy_poll;
-
         preempt_disable();
         for (;;) {
                 rc = 0;
                 local_bh_disable();
-                if (busy_poll) {
-                        rc = busy_poll(napi);
-                        goto count;
-                }
                 if (!napi_poll) {
                         unsigned long val = READ_ONCE(napi->state);
 
@@ -6956,13 +6948,6 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
                 features &= ~dev->gso_partial_features;
         }
 
-#ifdef CONFIG_NET_RX_BUSY_POLL
-        if (dev->netdev_ops->ndo_busy_poll)
-                features |= NETIF_F_BUSY_POLL;
-        else
-#endif
-                features &= ~NETIF_F_BUSY_POLL;
-
         return features;
 }
 
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 6b3eee0834a0..d5f412b3093d 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -102,7 +102,6 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
         [NETIF_F_RXALL_BIT] =            "rx-all",
         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
-        [NETIF_F_BUSY_POLL_BIT] =        "busy-poll",
         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
 };