bonding: Optimise is_netpoll_tx_blocked().

bond_start_xmit() spends some cycles in is_netpoll_tx_blocked():

  if (unlikely(is_netpoll_tx_blocked(dev)))
      return NETDEV_TX_BUSY;

because of the "pushf;pop reg" sequence (aka irqs_disabled()).

Let's swap the conditions in is_netpoll_tx_blocked() and
convert netpoll_block_tx to a static key.

Before:

   1.23 │       mov    %gs:0x28,%rax
   1.24 │       mov    %rax,0x18(%rsp)
  29.45 │       pushfq
   0.50 │       pop    %rax
   0.47 │       test   $0x200,%eax
        │     ↓ je     1b4
   0.49 │ 32:   lea    0x980(%rsi),%rbx

After:

   0.72 │       mov    %gs:0x28,%rax
   0.81 │       mov    %rax,0x18(%rsp)
   0.82 │       nop
   2.77 │ 2a:   lea    0x980(%rsi),%rbx

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260223230749.2376145-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions