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nfp: fix ethtool stats gather retry

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The while loop fetching 64 bit ethtool statistics may have
to retry multiple times, it shouldn't modify the outside state.

Fixes: 4c3523623d ("net: add driver for Netronome NFP4000/NFP6000 NIC VFs")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-10-10 09:16:22 -07:00 committed by David S. Miller
parent 3668bb8da1
commit c3d64ad4fe
1 changed files with 5 additions and 3 deletions
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8
drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
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@ -464,7 +464,7 @@ static u64 *nfp_vnic_get_sw_stats(struct net_device *netdev, u64 *data)
do {
start = u64_stats_fetch_begin(&nn->r_vecs[i].rx_sync);
*data++ = nn->r_vecs[i].rx_pkts;
data[0] = nn->r_vecs[i].rx_pkts;
tmp[0] = nn->r_vecs[i].hw_csum_rx_ok;
tmp[1] = nn->r_vecs[i].hw_csum_rx_inner_ok;
tmp[2] = nn->r_vecs[i].hw_csum_rx_error;
@ -472,14 +472,16 @@ static u64 *nfp_vnic_get_sw_stats(struct net_device *netdev, u64 *data)
do {
start = u64_stats_fetch_begin(&nn->r_vecs[i].tx_sync);
*data++ = nn->r_vecs[i].tx_pkts;
*data++ = nn->r_vecs[i].tx_busy;
data[1] = nn->r_vecs[i].tx_pkts;
data[2] = nn->r_vecs[i].tx_busy;
tmp[3] = nn->r_vecs[i].hw_csum_tx;
tmp[4] = nn->r_vecs[i].hw_csum_tx_inner;
tmp[5] = nn->r_vecs[i].tx_gather;
tmp[6] = nn->r_vecs[i].tx_lso;
} while (u64_stats_fetch_retry(&nn->r_vecs[i].tx_sync, start));
data += 3;
for (j = 0; j < NN_ET_RVEC_GATHER_STATS; j++)
gathered_stats[j] += tmp[j];
}