[PATCH 5.14 415/432] net: stmmac: Fix overall budget calculation for rxtx_napi

Greg Kroah-Hartman
2021-09-16T17:52:05Z

From: Song Yoong Siang <yoong.siang.song@intel.com>

commit 81d0885d68ec427e62044cf46a400c9958ea0092 upstream.

tx_done is not used for napi_complete_done(). Thus, NAPI busy polling
mechanism by gro_flush_timeout and napi_defer_hard_irqs will not able
be triggered after a packet is transmitted when there is no receive
packet.

Fix this by taking the maximum value between tx_done and rx_done as
overall budget completed by the rxtx NAPI poll to ensure XDP Tx ZC
operation is continuously polling for next Tx frame. This gives
benefit of lower packet submission processing latency and jitter
under XDP Tx ZC mode.

Performance of tx-only using xdp-sock on Intel ADL-S platform is
the same with and without this patch.

root@intel-corei7-64:~# ./xdpsock -i enp0s30f4 -t -z -q 1 -n 10
sock0@enp0s30f4:1 txonly xdp-drv
pps pkts 10.00
rx 0 0
tx 511630 8659520

sock0@enp0s30f4:1 txonly xdp-drv
pps pkts 10.00
rx 0 0
tx 511625 13775808

sock0@enp0s30f4:1 txonly xdp-drv
pps pkts 10.00
rx 0 0
tx 511619 18892032

Fixes: 132c32ee5bc0 ("net: stmmac: Add TX via XDP zero-copy socket")
Cc: <stable@vger.kernel.org> # 5.13.x
Co-developed-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5342,7 +5342,7 @@ static int stmmac_napi_poll_rxtx(struct
struct stmmac_channel *ch =
container_of(napi, struct stmmac_channel, rxtx_napi);
struct stmmac_priv *priv = ch->priv_data;
- int rx_done, tx_done;
+ int rx_done, tx_done, rxtx_done;
u32 chan = ch->index;

priv->xstats.napi_poll++;
@@ -5352,14 +5352,16 @@ static int stmmac_napi_poll_rxtx(struct

rx_done = stmmac_rx_zc(priv, budget, chan);

+ rxtx_done = max(tx_done, rx_done);
+
/* If either TX or RX work is not complete, return budget
* and keep pooling
*/
- if (tx_done >= budget || rx_done >= budget)
+ if (rxtx_done >= budget)
return budget;

/* all work done, exit the polling mode */
- if (napi_complete_done(napi, rx_done)) {
+ if (napi_complete_done(napi, rxtx_done)) {
unsigned long flags;

spin_lock_irqsave(&ch->lock, flags);
@@ -5370,7 +5372,7 @@ static int stmmac_napi_poll_rxtx(struct
spin_unlock_irqrestore(&ch->lock, flags);
}

- return min(rx_done, budget - 1);
+ return min(rxtx_done, budget - 1);
}

/**