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bnxt: remove ndo_poll_controller

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As diagnosed by Song Liu, ndo_poll_controller() can
be very dangerous on loaded hosts, since the cpu
calling ndo_poll_controller() might steal all NAPI
contexts (for all RX/TX queues of the NIC). This capture
can last for unlimited amount of time, since one
cpu is generally not able to drain all the queues under load.

bnxt uses NAPI for TX completions, so we better let core
networking stack call the napi->poll() to avoid the capture.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-09-21 15:27:50 -07:00 committed by David S. Miller
parent d8ea6a91ad
commit 58e0e22bff
1 changed files with 0 additions and 18 deletions
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18
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -7672,21 +7672,6 @@ static void bnxt_tx_timeout(struct net_device *dev)
bnxt_queue_sp_work(bp);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void bnxt_poll_controller(struct net_device *dev)
{
struct bnxt *bp = netdev_priv(dev);
int i;
/* Only process tx rings/combined rings in netpoll mode. */
for (i = 0; i < bp->tx_nr_rings; i++) {
struct bnxt_tx_ring_info *txr = &bp->tx_ring[i];
napi_schedule(&txr->bnapi->napi);
}
}
#endif
static void bnxt_timer(struct timer_list *t)
{
struct bnxt *bp = from_timer(bp, t, timer);
@ -8519,9 +8504,6 @@ static const struct net_device_ops bnxt_netdev_ops = {
.ndo_set_vf_link_state = bnxt_set_vf_link_state,
.ndo_set_vf_spoofchk = bnxt_set_vf_spoofchk,
.ndo_set_vf_trust = bnxt_set_vf_trust,
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = bnxt_poll_controller,
#endif
.ndo_setup_tc = bnxt_setup_tc,
#ifdef CONFIG_RFS_ACCEL