[PATCH v2 RESEND 1/1] net: fec: add xdp and page pool statistics

Shenwei Wang
2022-11-09T02:32:05Z

Added xdp and page pool statistics.
In order to make the implementation simple and compatible, the patch
uses the 32bit integer to record the XDP statistics.

Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
---
Changes in v2:
- clean up and restructure the codes per Andrew Lunn's review comments
- clear the statistics when the adaptor is down

drivers/net/ethernet/freescale/fec.h | 14 ++++
drivers/net/ethernet/freescale/fec_main.c | 85 +++++++++++++++++++++--
2 files changed, 94 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 61e847b18343..5ba1e0d71c68 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -526,6 +526,19 @@ struct fec_enet_priv_txrx_info {
struct sk_buff *skb;
};

+enum {
+ RX_XDP_REDIRECT = 0,
+ RX_XDP_PASS,
+ RX_XDP_DROP,
+ RX_XDP_TX,
+ RX_XDP_TX_ERRORS,
+ TX_XDP_XMIT,
+ TX_XDP_XMIT_ERRORS,
+
+ /* The following must be the last one */
+ XDP_STATS_TOTAL,
+};
+
struct fec_enet_priv_tx_q {
struct bufdesc_prop bd;
unsigned char *tx_bounce[TX_RING_SIZE];
@@ -546,6 +559,7 @@ struct fec_enet_priv_rx_q {
/* page_pool */
struct page_pool *page_pool;
struct xdp_rxq_info xdp_rxq;
+ u32 stats[XDP_STATS_TOTAL];

/* rx queue number, in the range 0-7 */
u8 id;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 3fb870340c22..d18e50871c42 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1523,10 +1523,12 @@ fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,

switch (act) {
case XDP_PASS:
+ rxq->stats[RX_XDP_PASS]++;
ret = FEC_ENET_XDP_PASS;
break;

case XDP_REDIRECT:
+ rxq->stats[RX_XDP_REDIRECT]++;
err = xdp_do_redirect(fep->netdev, xdp, prog);
if (!err) {
ret = FEC_ENET_XDP_REDIR;
@@ -1549,6 +1551,7 @@ fec_enet_run_xdp(struct fec_enet_private *fep, struct bpf_prog *prog,
fallthrough; /* handle aborts by dropping packet */

case XDP_DROP:
+ rxq->stats[RX_XDP_DROP]++;
ret = FEC_ENET_XDP_CONSUMED;
page = virt_to_head_page(xdp->data);
page_pool_put_page(rxq->page_pool, page, sync, true);
@@ -2659,6 +2662,16 @@ static const struct fec_stat {

#define FEC_STATS_SIZE (ARRAY_SIZE(fec_stats) * sizeof(u64))

+static const char *fec_xdp_stat_strs[XDP_STATS_TOTAL] = {
+ "rx_xdp_redirect", /* RX_XDP_REDIRECT = 0, */
+ "rx_xdp_pass", /* RX_XDP_PASS, */
+ "rx_xdp_drop", /* RX_XDP_DROP, */
+ "rx_xdp_tx", /* RX_XDP_TX, */
+ "rx_xdp_tx_errors", /* RX_XDP_TX_ERRORS, */
+ "tx_xdp_xmit", /* TX_XDP_XMIT, */
+ "tx_xdp_xmit_errors", /* TX_XDP_XMIT_ERRORS, */
+};
+
static void fec_enet_update_ethtool_stats(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
@@ -2668,6 +2681,40 @@ static void fec_enet_update_ethtool_stats(struct net_device *dev)
fep->ethtool_stats[i] = readl(fep->hwp + fec_stats[i].offset);
}

+static void fec_enet_get_xdp_stats(struct fec_enet_private *fep, u64 *data)
+{
+ u64 xdp_stats[XDP_STATS_TOTAL] = { 0 };
+ struct fec_enet_priv_rx_q *rxq;
+ int i, j;
+
+ for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+ rxq = fep->rx_queue[i];
+
+ for (j = 0; j < XDP_STATS_TOTAL; j++)
+ xdp_stats[j] += rxq->stats[j];
+ }
+
+ memcpy(data, xdp_stats, sizeof(xdp_stats));
+}
+
+static void fec_enet_page_pool_stats(struct fec_enet_private *fep, u64 *data)
+{
+ struct page_pool_stats stats = {};
+ struct fec_enet_priv_rx_q *rxq;
+ int i;
+
+ for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+ rxq = fep->rx_queue[i];
+
+ if (!rxq->page_pool)
+ continue;
+
+ page_pool_get_stats(rxq->page_pool, &stats);
+ }
+
+ page_pool_ethtool_stats_get(data, &stats);
+}
+
static void fec_enet_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
@@ -2677,6 +2724,12 @@ static void fec_enet_get_ethtool_stats(struct net_device *dev,
fec_enet_update_ethtool_stats(dev);

memcpy(data, fep->ethtool_stats, FEC_STATS_SIZE);
+ data += FEC_STATS_SIZE / sizeof(u64);
+
+ fec_enet_get_xdp_stats(fep, data);
+ data += XDP_STATS_TOTAL;
+
+ fec_enet_page_pool_stats(fep, data);
}

static void fec_enet_get_strings(struct net_device *netdev,
@@ -2685,9 +2738,16 @@ static void fec_enet_get_strings(struct net_device *netdev,
int i;
switch (stringset) {
case ETH_SS_STATS:
- for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
- memcpy(data + i * ETH_GSTRING_LEN,
- fec_stats[i].name, ETH_GSTRING_LEN);
+ for (i = 0; i < ARRAY_SIZE(fec_stats); i++) {
+ memcpy(data, fec_stats[i].name, ETH_GSTRING_LEN);
+ data += ETH_GSTRING_LEN;
+ }
+ for (i = 0; i < ARRAY_SIZE(fec_xdp_stat_strs); i++) {
+ memcpy(data, fec_xdp_stat_strs[i], ETH_GSTRING_LEN);
+ data += ETH_GSTRING_LEN;
+ }
+ page_pool_ethtool_stats_get_strings(data);
+
break;
case ETH_SS_TEST:
net_selftest_get_strings(data);
@@ -2697,9 +2757,14 @@ static void fec_enet_get_strings(struct net_device *netdev,

static int fec_enet_get_sset_count(struct net_device *dev, int sset)
{
+ int count;
+
switch (sset) {
case ETH_SS_STATS:
- return ARRAY_SIZE(fec_stats);
+ count = ARRAY_SIZE(fec_stats) + XDP_STATS_TOTAL;
+ count += page_pool_ethtool_stats_get_count();
+ return count;
+
case ETH_SS_TEST:
return net_selftest_get_count();
default:
@@ -2710,7 +2775,8 @@ static int fec_enet_get_sset_count(struct net_device *dev, int sset)
static void fec_enet_clear_ethtool_stats(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
- int i;
+ struct fec_enet_priv_rx_q *rxq;
+ int i, j;

/* Disable MIB statistics counters */
writel(FEC_MIB_CTRLSTAT_DISABLE, fep->hwp + FEC_MIB_CTRLSTAT);
@@ -2718,6 +2784,12 @@ static void fec_enet_clear_ethtool_stats(struct net_device *dev)
for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
writel(0, fep->hwp + fec_stats[i].offset);

+ for (i = fep->num_rx_queues - 1; i >= 0; i--) {
+ rxq = fep->rx_queue[i];
+ for (j = 0; j < XDP_STATS_TOTAL; j++)
+ rxq->stats[j] = 0;
+ }
+
/* Don't disable MIB statistics counters */
writel(0, fep->hwp + FEC_MIB_CTRLSTAT);
}
@@ -3084,6 +3156,9 @@ static void fec_enet_free_buffers(struct net_device *ndev)
for (i = 0; i < rxq->bd.ring_size; i++)
page_pool_release_page(rxq->page_pool, rxq->rx_skb_info[i].page);

+ for (i = 0; i < XDP_STATS_TOTAL; i++)
+ rxq->stats[i] = 0;
+
if (xdp_rxq_info_is_reg(&rxq->xdp_rxq))
xdp_rxq_info_unreg(&rxq->xdp_rxq);
page_pool_destroy(rxq->page_pool);
--
2.34.1