[PATCH bpf-next 09/10] ice: xsk: avoid refilling single Rx descriptors

Maciej Fijalkowski
2022-04-05T12:04:19Z

Call alloc Rx routine for ZC driver only when the amount of unallocated
descriptors exceeds given threshold.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
drivers/net/ethernet/intel/ice/ice_xsk.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 272c0daf9ed3..143f6b6937bd 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -581,6 +581,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
unsigned int xdp_xmit = 0;
struct bpf_prog *xdp_prog;
bool failure = false;
+ int entries_to_alloc;

/* ZC patch is enabled only when XDP program is set,
* so here it can not be NULL
@@ -673,7 +674,9 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
ice_receive_skb(rx_ring, skb, vlan_tag);
}

- failure |= !ice_alloc_rx_bufs_zc(rx_ring, ICE_DESC_UNUSED(rx_ring));
+ entries_to_alloc = ICE_DESC_UNUSED(rx_ring);
+ if (entries_to_alloc > ICE_RING_QUARTER(rx_ring))
+ failure |= !ice_alloc_rx_bufs_zc(rx_ring, entries_to_alloc);

ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes);
--
2.33.1