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authorMaciej Fijalkowski <maciej.fijalkowski@intel.com>2022-03-02 09:59:27 -0800
committerJakub Kicinski <kuba@kernel.org>2022-03-03 08:26:55 -0800
commit6c7273a266759d9d36f7c862149f248bcdeddc0f (patch)
tree2ee8b9a50c61c5c202492645dfe338c21e8cf60e /drivers
parent312f2d500af55823b96cd33b6b9bf6c4c0bc6e78 (diff)
ixgbe: xsk: change !netif_carrier_ok() handling in ixgbe_xmit_zc()
Commit c685c69fba71 ("ixgbe: don't do any AF_XDP zero-copy transmit if netif is not OK") addressed the ring transient state when MEM_TYPE_XSK_BUFF_POOL was being configured which in turn caused the interface to through down/up. Maurice reported that when carrier is not ok and xsk_pool is present on ring pair, ksoftirqd will consume 100% CPU cycles due to the constant NAPI rescheduling as ixgbe_poll() states that there is still some work to be done. To fix this, do not set work_done to false for a !netif_carrier_ok(). Fixes: c685c69fba71 ("ixgbe: don't do any AF_XDP zero-copy transmit if netif is not OK") Reported-by: Maurice Baijens <maurice.baijens@ellips.com> Tested-by: Maurice Baijens <maurice.baijens@ellips.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index b3fd8e5cd85b..6a5e9cf6b5da 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -390,12 +390,14 @@ static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
u32 cmd_type;
while (budget-- > 0) {
- if (unlikely(!ixgbe_desc_unused(xdp_ring)) ||
- !netif_carrier_ok(xdp_ring->netdev)) {
+ if (unlikely(!ixgbe_desc_unused(xdp_ring))) {
work_done = false;
break;
}
+ if (!netif_carrier_ok(xdp_ring->netdev))
+ break;
+
if (!xsk_tx_peek_desc(pool, &desc))
break;