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net: remove support for per driver ndo_busy_poll()

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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>
This commit is contained in:
Eric Dumazet 2017-02-02 18:43:28 -08:00 committed by David S. Miller
parent 7a655c6324
commit 79e7fff47b
4 changed files with 0 additions and 21 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/netdev_features.h
View file

@ -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) \

3
include/linux/netdevice.h
View file

@ -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);

15
net/core/dev.c
View file

@ -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 @@ bool sk_busy_loop(struct sock *sk, int nonblock)
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;
}

1
net/core/ethtool.c
View file

@ -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",
};