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bng_en: periodically fetch and accumulate hardware statistics

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Use the timer to schedule periodic stats collection via
the workqueue when the link is up. Fetch fresh counters from
hardware via DMA and accumulate them into 64-bit software
shadows, handling wrap-around for counters narrower than
64 bits.

Signed-off-by: Bhargava Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Rahul Gupta <rahul-rg.gupta@broadcom.com>
Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde@broadcom.com>
Link: https://patch.msgid.link/20260406180420.279470-8-bhargava.marreddy@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Bhargava Marreddy 2026-04-06 23:34:17 +05:30 committed by Jakub Kicinski
parent 8438239bd2
commit 50c885cb2e
2 changed files with 99 additions and 0 deletions
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98
drivers/net/ethernet/broadcom/bnge/bnge_netdev.c
View File

@ -69,6 +69,9 @@ static int bnge_alloc_stats_mem(struct bnge_net *bn,
if (!stats->hw_masks)
goto stats_mem_err;
}
u64_stats_init(&stats->syncp);
return 0;
stats_mem_err:
@ -294,9 +297,98 @@ static void bnge_timer(struct timer_list *t)
}
}
if (BNGE_LINK_IS_UP(bd) && bn->stats_coal_ticks)
bnge_queue_sp_work(bn, BNGE_PERIODIC_STATS_SP_EVENT);
mod_timer(&bn->timer, jiffies + bn->current_interval);
}
static void bnge_add_one_ctr(u64 hw, u64 *sw, u64 mask)
{
u64 sw_tmp, sw_val;
hw &= mask;
sw_val = READ_ONCE(*sw);
sw_tmp = (sw_val & ~mask) | hw;
if (hw < (sw_val & mask))
sw_tmp += mask + 1;
WRITE_ONCE(*sw, sw_tmp);
}
static void __bnge_accumulate_stats(__le64 *hw_stats, u64 *sw_stats, u64 *masks,
int count, struct u64_stats_sync *syncp)
{
unsigned long flags;
int i;
flags = u64_stats_update_begin_irqsave(syncp);
for (i = 0; i < count; i++) {
u64 hw = le64_to_cpu(READ_ONCE(hw_stats[i]));
if (masks[i] == -1ULL)
WRITE_ONCE(sw_stats[i], hw);
else
bnge_add_one_ctr(hw, &sw_stats[i], masks[i]);
}
u64_stats_update_end_irqrestore(syncp, flags);
}
static void bnge_accumulate_stats(struct bnge_stats_mem *stats)
{
if (!stats->hw_stats)
return;
__bnge_accumulate_stats(stats->hw_stats, stats->sw_stats,
stats->hw_masks, stats->len / 8, &stats->syncp);
}
static void bnge_accumulate_all_stats(struct bnge_dev *bd)
{
struct bnge_net *bn = netdev_priv(bd->netdev);
struct bnge_stats_mem *ring0_stats = NULL;
int i;
for (i = 0; i < bd->nq_nr_rings; i++) {
struct bnge_napi *bnapi = bn->bnapi[i];
struct bnge_nq_ring_info *nqr;
struct bnge_stats_mem *stats;
nqr = &bnapi->nq_ring;
stats = &nqr->stats;
if (!ring0_stats)
ring0_stats = &bn->bnapi[0]->nq_ring.stats;
__bnge_accumulate_stats(stats->hw_stats, stats->sw_stats,
ring0_stats->hw_masks,
ring0_stats->len / 8, &stats->syncp);
}
if (bn->flags & BNGE_FLAG_PORT_STATS) {
struct bnge_stats_mem *stats = &bn->port_stats;
__le64 *hw_stats = stats->hw_stats;
u64 *sw_stats = stats->sw_stats;
u64 *masks = stats->hw_masks;
u16 cnt;
cnt = sizeof(struct rx_port_stats) / 8;
__bnge_accumulate_stats(hw_stats, sw_stats, masks, cnt,
&stats->syncp);
hw_stats += BNGE_TX_PORT_STATS_BYTE_OFFSET / 8;
sw_stats += BNGE_TX_PORT_STATS_BYTE_OFFSET / 8;
masks += BNGE_TX_PORT_STATS_BYTE_OFFSET / 8;
cnt = sizeof(struct tx_port_stats) / 8;
__bnge_accumulate_stats(hw_stats, sw_stats, masks, cnt,
&stats->syncp);
}
if (bn->flags & BNGE_FLAG_PORT_STATS_EXT) {
bnge_accumulate_stats(&bn->rx_port_stats_ext);
bnge_accumulate_stats(&bn->tx_port_stats_ext);
}
}
static void bnge_sp_task(struct work_struct *work)
{
struct bnge_net *bn = container_of(work, struct bnge_net, sp_task);
@ -309,6 +401,12 @@ static void bnge_sp_task(struct work_struct *work)
return;
}
if (test_and_clear_bit(BNGE_PERIODIC_STATS_SP_EVENT, &bn->sp_event)) {
bnge_hwrm_port_qstats(bd, 0);
bnge_hwrm_port_qstats_ext(bd, 0);
bnge_accumulate_all_stats(bd);
}
if (test_and_clear_bit(BNGE_UPDATE_PHY_SP_EVENT, &bn->sp_event)) {
int rc;

1
drivers/net/ethernet/broadcom/bnge/bnge_netdev.h
View File

@ -278,6 +278,7 @@ enum bnge_sp_event {
BNGE_LINK_SPEED_CHNG_SP_EVENT,
BNGE_LINK_CFG_CHANGE_SP_EVENT,
BNGE_UPDATE_PHY_SP_EVENT,
BNGE_PERIODIC_STATS_SP_EVENT,
};
struct bnge_net {