On 01/11/2021 16:03, Maxim Kiselev wrote:
From ca26bf62366f249a2ed360b00c1883652848bfdc Mon Sep 17 00:00:00 2001
From: Maxim Kiselev <bigunclemax@xxxxxxxxx>
Date: Mon, 1 Nov 2021 16:37:12 +0300
Subject: [PATCH v2] net: davinci_emac: Fix interrupt pacing disable
This patch allows to use 0 for `coal->rx_coalesce_usecs` param to
disable rx irq coalescing.
Previously we could enable rx irq coalescing via ethtool
(For ex: `ethtool -C eth0 rx-usecs 2000`) but we couldn't disable
it because this part rejects 0 value:
if (!coal->rx_coalesce_usecs)
return -EINVAL;
Fixes: 84da2658a619 ("TI DaVinci EMAC : Implement interrupt pacing
functionality.")
Signed-off-by: Maxim Kiselev <bigunclemax@xxxxxxxxx>
---
Changes v1 -> v2 (after review of Grygorii Strashko):
- Simplify !coal->rx_coalesce_usecs handler
Do not send v2 as reply to v1 - pls, re-send as it will not hit
https://patchwork.kernel.org/project/netdevbpf/list/ properly
Otherwise:
Reviewed-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
---
drivers/net/ethernet/ti/davinci_emac.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/ti/davinci_emac.c
b/drivers/net/ethernet/ti/davinci_emac.c
index e8291d8488391..d243ca5dfde00 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -420,8 +420,20 @@ static int emac_set_coalesce(struct net_device *ndev,
u32 int_ctrl, num_interrupts = 0;
u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0;
- if (!coal->rx_coalesce_usecs)
- return -EINVAL;
+ if (!coal->rx_coalesce_usecs) {
+ priv->coal_intvl = 0;
+
+ switch (priv->version) {
+ case EMAC_VERSION_2:
+ emac_ctrl_write(EMAC_DM646X_CMINTCTRL, 0);
+ break;
+ default:
+ emac_ctrl_write(EMAC_CTRL_EWINTTCNT, 0);
+ break;
+ }
+
+ return 0;
+ }
coal_intvl = coal->rx_coalesce_usecs;
--
Best regards,
grygorii
