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bnxt_en: Save ring statistics before reset.

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With the current driver, the statistics reported by .ndo_get_stats64()
are reset when the device goes down.  Store a snapshot of the
rtnl_link_stats64 before shutdown.  This snapshot is added to the
current counters in .ndo_get_stats64() so that the counters will not
get reset when the device is down.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2018-12-16 18:46:29 -05:00 committed by David S. Miller
parent 7c675421af
commit b8875ca356
2 changed files with 44 additions and 14 deletions
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57
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -8333,6 +8333,9 @@ static bool bnxt_drv_busy(struct bnxt *bp)
test_bit(BNXT_STATE_READ_STATS, &bp->state));
}
static void bnxt_get_ring_stats(struct bnxt *bp,
struct rtnl_link_stats64 *stats);
static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
bool link_re_init)
{
@ -8358,6 +8361,9 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
del_timer_sync(&bp->timer);
bnxt_free_skbs(bp);
/* Save ring stats before shutdown */
if (bp->bnapi)
bnxt_get_ring_stats(bp, &bp->net_stats_prev);
if (irq_re_init) {
bnxt_free_irq(bp);
bnxt_del_napi(bp);
@ -8419,23 +8425,12 @@ static int bnxt_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return -EOPNOTSUPP;
}
static void
bnxt_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
static void bnxt_get_ring_stats(struct bnxt *bp,
struct rtnl_link_stats64 *stats)
{
u32 i;
struct bnxt *bp = netdev_priv(dev);
int i;
set_bit(BNXT_STATE_READ_STATS, &bp->state);
/* Make sure bnxt_close_nic() sees that we are reading stats before
* we check the BNXT_STATE_OPEN flag.
*/
smp_mb__after_atomic();
if (!test_bit(BNXT_STATE_OPEN, &bp->state)) {
clear_bit(BNXT_STATE_READ_STATS, &bp->state);
return;
}
/* TODO check if we need to synchronize with bnxt_close path */
for (i = 0; i < bp->cp_nr_rings; i++) {
struct bnxt_napi *bnapi = bp->bnapi[i];
struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
@ -8464,6 +8459,40 @@ bnxt_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
stats->tx_dropped += le64_to_cpu(hw_stats->tx_drop_pkts);
}
}
static void bnxt_add_prev_stats(struct bnxt *bp,
struct rtnl_link_stats64 *stats)
{
struct rtnl_link_stats64 *prev_stats = &bp->net_stats_prev;
stats->rx_packets += prev_stats->rx_packets;
stats->tx_packets += prev_stats->tx_packets;
stats->rx_bytes += prev_stats->rx_bytes;
stats->tx_bytes += prev_stats->tx_bytes;
stats->rx_missed_errors += prev_stats->rx_missed_errors;
stats->multicast += prev_stats->multicast;
stats->tx_dropped += prev_stats->tx_dropped;
}
static void
bnxt_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
struct bnxt *bp = netdev_priv(dev);
set_bit(BNXT_STATE_READ_STATS, &bp->state);
/* Make sure bnxt_close_nic() sees that we are reading stats before
* we check the BNXT_STATE_OPEN flag.
*/
smp_mb__after_atomic();
if (!test_bit(BNXT_STATE_OPEN, &bp->state)) {
clear_bit(BNXT_STATE_READ_STATS, &bp->state);
*stats = bp->net_stats_prev;
return;
}
bnxt_get_ring_stats(bp, stats);
bnxt_add_prev_stats(bp, stats);
if (bp->flags & BNXT_FLAG_PORT_STATS) {
struct rx_port_stats *rx = bp->hw_rx_port_stats;

1
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -1472,6 +1472,7 @@ struct bnxt {
void *hwrm_cmd_resp_addr;
dma_addr_t hwrm_cmd_resp_dma_addr;
struct rtnl_link_stats64 net_stats_prev;
struct rx_port_stats *hw_rx_port_stats;
struct tx_port_stats *hw_tx_port_stats;
struct rx_port_stats_ext *hw_rx_port_stats_ext;