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nfp: don't add ring size to index calculations

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

Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-05-28 17:53:03 -07:00 committed by David S. Miller
parent 193d6218ba
commit 770f0cea19
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
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@ -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);