netdev - [PATCH net-next] ice, xsk: Move Rx alloction out of while-loop

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Message-Id: <20201210121915.14412-1-bjorn.topel@gmail.com>
Date:   Thu, 10 Dec 2020 13:19:15 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     intel-wired-lan@...ts.osuosl.org
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, maciej.fijalkowski@...el.com
Subject: [PATCH net-next] ice, xsk: Move Rx alloction out of while-loop

From: Björn Töpel <bjorn.topel@...el.com>

Instead of trying to allocate for each packet, move it outside the
while loop and try to allocate once every NAPI loop.

This change boosts the xdpsock rxdrop scenario with 15% more
packets-per-second.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 797886524054..39757b4cf8f4 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -570,12 +570,6 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 		u16 vlan_tag = 0;
 		u8 rx_ptype;
 
-		if (cleaned_count >= ICE_RX_BUF_WRITE) {
-			failure |= ice_alloc_rx_bufs_zc(rx_ring,
-							cleaned_count);
-			cleaned_count = 0;
-		}
-
 		rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
 		stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S);
@@ -642,6 +636,9 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 		ice_receive_skb(rx_ring, skb, vlan_tag);
 	}
 
+	if (cleaned_count >= ICE_RX_BUF_WRITE)
+		failure = !ice_alloc_rx_bufs_zc(rx_ring, cleaned_count);
+
 	ice_finalize_xdp_rx(rx_ring, xdp_xmit);
 	ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes);
 

base-commit: a7105e3472bf6bb3099d1293ea7d70e7783aa582
-- 
2.27.0