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net: ethernet: ti: fix netdevice stats for XDP 

Align netdevice statistics when the device is running in XDP mode
to other upstream drivers. In particular report to user-space rx
packets even if they are not forwarded to the networking stack
(XDP_PASS) but if they are redirected (XDP_REDIRECT), dropped (XDP_DROP)
or sent back using the same interface (XDP_TX). This patch allows the
system administrator to verify the device is receiving data correctly.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/a457cb17dd9c58c116d64ee34c354b2e89c0ff8f.1612375372.git.lorenzo@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2021-02-03 19:06:17 +01:00 committed by Jakub Kicinski
parent b91b3a2115
commit a8225efdf3
4 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/ti/cpsw.c
View File

@ -403,12 +403,10 @@ static void cpsw_rx_handler(void *token, int len, int status)
xdp_prepare_buff(&xdp, pa, headroom, size, false);
port = priv->emac_port + cpsw->data.dual_emac;
ret = cpsw_run_xdp(priv, ch, &xdp, page, port);
ret = cpsw_run_xdp(priv, ch, &xdp, page, port, &len);
if (ret != CPSW_XDP_PASS)
goto requeue;
/* XDP prog might have changed packet data and boundaries */
len = xdp.data_end - xdp.data;
headroom = xdp.data - xdp.data_hard_start;
/* XDP prog can modify vlan tag, so can't use encap header */

4
drivers/net/ethernet/ti/cpsw_new.c
View File

@ -345,12 +345,10 @@ static void cpsw_rx_handler(void *token, int len, int status)
xdp_prepare_buff(&xdp, pa, headroom, size, false);
ret = cpsw_run_xdp(priv, ch, &xdp, page, priv->emac_port);
ret = cpsw_run_xdp(priv, ch, &xdp, page, priv->emac_port, &len);
if (ret != CPSW_XDP_PASS)
goto requeue;
/* XDP prog might have changed packet data and boundaries */
len = xdp.data_end - xdp.data;
headroom = xdp.data - xdp.data_hard_start;
/* XDP prog can modify vlan tag, so can't use encap header */

12
drivers/net/ethernet/ti/cpsw_priv.c
View File

@ -1323,7 +1323,7 @@ int cpsw_xdp_tx_frame(struct cpsw_priv *priv, struct xdp_frame *xdpf,
}
int cpsw_run_xdp(struct cpsw_priv *priv, int ch, struct xdp_buff *xdp,
struct page *page, int port)
struct page *page, int port, int *len)
{
struct cpsw_common *cpsw = priv->cpsw;
struct net_device *ndev = priv->ndev;
@ -1341,10 +1341,13 @@ int cpsw_run_xdp(struct cpsw_priv *priv, int ch, struct xdp_buff *xdp,
}
act = bpf_prog_run_xdp(prog, xdp);
/* XDP prog might have changed packet data and boundaries */
*len = xdp->data_end - xdp->data;
switch (act) {
case XDP_PASS:
ret = CPSW_XDP_PASS;
break;
goto out;
case XDP_TX:
xdpf = xdp_convert_buff_to_frame(xdp);
if (unlikely(!xdpf))
@ -1370,8 +1373,13 @@ int cpsw_run_xdp(struct cpsw_priv *priv, int ch, struct xdp_buff *xdp,
trace_xdp_exception(ndev, prog, act);
fallthrough; /* handle aborts by dropping packet */
case XDP_DROP:
ndev->stats.rx_bytes += *len;
ndev->stats.rx_packets++;
goto drop;
}
ndev->stats.rx_bytes += *len;
ndev->stats.rx_packets++;
out:
rcu_read_unlock();
return ret;

2
drivers/net/ethernet/ti/cpsw_priv.h
View File

@ -438,7 +438,7 @@ int cpsw_ndo_bpf(struct net_device *ndev, struct netdev_bpf *bpf);
int cpsw_xdp_tx_frame(struct cpsw_priv *priv, struct xdp_frame *xdpf,
struct page *page, int port);
int cpsw_run_xdp(struct cpsw_priv *priv, int ch, struct xdp_buff *xdp,
struct page *page, int port);
struct page *page, int port, int *len);
irqreturn_t cpsw_tx_interrupt(int irq, void *dev_id);
irqreturn_t cpsw_rx_interrupt(int irq, void *dev_id);
irqreturn_t cpsw_misc_interrupt(int irq, void *dev_id);