[PATCH net-next 11/12] nfp: don't add ring size to index calculations

[Jakub Kicinski]

Adding ring size to index calculation is pointless, since index
will be masked with ring size - 1.

Suggested-by: David Laight <david.lai...@aculab.com>
Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 9312a737fbc9..68013d048e9d 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -928,7 +928,7 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring 
*tx_ring)
        if (qcp_rd_p == tx_ring->qcp_rd_p)
                return;
 
-       todo = D_IDX(tx_ring, qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p);
+       todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
 
        while (todo--) {
                idx = D_IDX(tx_ring, tx_ring->rd_p++);
@@ -999,7 +999,7 @@ static bool nfp_net_xdp_complete(struct nfp_net_tx_ring 
*tx_ring)
        if (qcp_rd_p == tx_ring->qcp_rd_p)
                return true;
 
-       todo = D_IDX(tx_ring, qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p);
+       todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
 
        done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
        todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
-- 
2.11.0