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>

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 9c6c8ef..9a04195 100644 (file)
--- 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 f3878fb..6f18b50 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1184,9 +1184,6 @@ struct net_device_ops {
        int                     (*ndo_netpoll_setup)(struct net_device *dev,
                                                     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);

diff --git a/net/core/dev.c b/net/core/dev.c
index 727b6fd..4cde8bf 100644 (file)
--- 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 6b3eee0..d5f412b 100644 (file)
--- 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",
 };