Commit 3bb502f8 authored by Iyappan Subramanian's avatar Iyappan Subramanian Committed by David S. Miller

drivers: net: xgene: fix statistics counters race condition

This patch fixes the race condition on updating the statistics
counters by moving the counters to the ring structure.
Signed-off-by: default avatarIyappan Subramanian <isubramanian@apm.com>
Tested-by: default avatarToan Le <toanle@apm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1b090a48
......@@ -219,27 +219,30 @@ void xgene_enet_parse_error(struct xgene_enet_desc_ring *ring,
struct xgene_enet_pdata *pdata,
enum xgene_enet_err_code status)
{
struct rtnl_link_stats64 *stats = &pdata->stats;
switch (status) {
case INGRESS_CRC:
stats->rx_crc_errors++;
ring->rx_crc_errors++;
ring->rx_dropped++;
break;
case INGRESS_CHECKSUM:
case INGRESS_CHECKSUM_COMPUTE:
stats->rx_errors++;
ring->rx_errors++;
ring->rx_dropped++;
break;
case INGRESS_TRUNC_FRAME:
stats->rx_frame_errors++;
ring->rx_frame_errors++;
ring->rx_dropped++;
break;
case INGRESS_PKT_LEN:
stats->rx_length_errors++;
ring->rx_length_errors++;
ring->rx_dropped++;
break;
case INGRESS_PKT_UNDER:
stats->rx_frame_errors++;
ring->rx_frame_errors++;
ring->rx_dropped++;
break;
case INGRESS_FIFO_OVERRUN:
stats->rx_fifo_errors++;
ring->rx_fifo_errors++;
break;
default:
break;
......
......@@ -201,6 +201,8 @@ enum xgene_enet_rm {
#define USERINFO_LEN 32
#define FPQNUM_POS 32
#define FPQNUM_LEN 12
#define ELERR_POS 46
#define ELERR_LEN 2
#define NV_POS 50
#define NV_LEN 1
#define LL_POS 51
......
......@@ -443,8 +443,8 @@ static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
skb_tx_timestamp(skb);
pdata->stats.tx_packets++;
pdata->stats.tx_bytes += skb->len;
tx_ring->tx_packets++;
tx_ring->tx_bytes += skb->len;
pdata->ring_ops->wr_cmd(tx_ring, count);
return NETDEV_TX_OK;
......@@ -483,12 +483,12 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
skb = buf_pool->rx_skb[skb_index];
/* checking for error */
status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) ||
GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
if (unlikely(status > 2)) {
dev_kfree_skb_any(skb);
xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
status);
pdata->stats.rx_dropped++;
ret = -EIO;
goto out;
}
......@@ -506,8 +506,8 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
xgene_enet_skip_csum(skb);
}
pdata->stats.rx_packets++;
pdata->stats.rx_bytes += datalen;
rx_ring->rx_packets++;
rx_ring->rx_bytes += datalen;
napi_gro_receive(&rx_ring->napi, skb);
out:
if (--rx_ring->nbufpool == 0) {
......@@ -1114,12 +1114,31 @@ static struct rtnl_link_stats64 *xgene_enet_get_stats64(
{
struct xgene_enet_pdata *pdata = netdev_priv(ndev);
struct rtnl_link_stats64 *stats = &pdata->stats;
struct xgene_enet_desc_ring *ring;
int i;
memset(stats, 0, sizeof(struct rtnl_link_stats64));
for (i = 0; i < pdata->txq_cnt; i++) {
ring = pdata->tx_ring[i];
if (ring) {
stats->tx_packets += ring->tx_packets;
stats->tx_bytes += ring->tx_bytes;
}
}
stats->rx_errors += stats->rx_length_errors +
stats->rx_crc_errors +
stats->rx_frame_errors +
stats->rx_fifo_errors;
memcpy(storage, &pdata->stats, sizeof(struct rtnl_link_stats64));
for (i = 0; i < pdata->rxq_cnt; i++) {
ring = pdata->rx_ring[i];
if (ring) {
stats->rx_packets += ring->rx_packets;
stats->rx_bytes += ring->rx_bytes;
stats->rx_errors += ring->rx_length_errors +
ring->rx_crc_errors +
ring->rx_frame_errors +
ring->rx_fifo_errors;
stats->rx_dropped += ring->rx_dropped;
}
}
memcpy(storage, stats, sizeof(struct rtnl_link_stats64));
return storage;
}
......
......@@ -121,6 +121,16 @@ struct xgene_enet_desc_ring {
struct xgene_enet_raw_desc16 *raw_desc16;
};
__le64 *exp_bufs;
u64 tx_packets;
u64 tx_bytes;
u64 rx_packets;
u64 rx_bytes;
u64 rx_dropped;
u64 rx_errors;
u64 rx_length_errors;
u64 rx_crc_errors;
u64 rx_frame_errors;
u64 rx_fifo_errors;
};
struct xgene_mac_ops {
......
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