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ice: xsk: Eliminate unnecessary loop iteration

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The NIC Tx ring completion routine cleans entries from the ring in
batches. However, it processes one more batch than it is supposed
to. Note that this does not matter from a functionality point of view
since it will not find a set DD bit for the next batch and just exit
the loop. But from a performance perspective, it is faster to
terminate the loop before and not issue an expensive read over PCIe to
get the DD bit.

Fixes: 126cdfe100 ("ice: xsk: Improve AF_XDP ZC Tx and use batching API")
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220328142123.170157-3-maciej.fijalkowski@intel.com
This commit is contained in:
Magnus Karlsson 2022-03-28 16:21:21 +02:00 committed by Alexei Starovoitov
parent a95a4d9b39
commit 30d19d57d5
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/ice/ice_xsk.c
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@ -754,7 +754,7 @@ skip:
next_dd = next_dd + tx_thresh;
if (next_dd >= desc_cnt)
next_dd = tx_thresh - 1;
} while (budget--);
} while (--budget);
xdp_ring->next_dd = next_dd;