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brcm63xx: fix ethernet breakage in 3.18

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Linux commit d75b1ade567ffab ("net: less interrupt masking in NAPI")
chose the samantics of the napi poll return value, which caused napi to
not resume interrups/polling anymore.

Fix the return value to restore expected behaviour.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 44576
This commit is contained in:
Jonas Gorski 2015-02-28 19:59:46 +00:00
parent 6df9324642
commit 40e6eae61f
2 changed files with 54 additions and 0 deletions
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27
target/linux/brcm63xx/patches-3.14/426-bcm63xx_enet-fix-napi-poll-return-value.patch Normal file
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@ -0,0 +1,27 @@
From d150ac8f353cb1ab59288829db006300120c9daf Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Sat, 28 Feb 2015 20:23:13 +0100
Subject: [PATCH] bcm63xx_enet: fix napi poll return value
Commit d75b1ade567ffab ("net: less interrupt masking in NAPI") changed
the way how napi treated a returnvalue < budget, which causes hangs when
there there was tx_work_done, but rx_work_done is less than budget.
To fix this, return budget instead of rx_done to ensure repolling.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -508,7 +508,7 @@ static int bcm_enet_poll(struct napi_str
if (rx_work_done >= budget || tx_work_done > 0) {
/* rx/tx queue is not yet empty/clean */
- return rx_work_done;
+ return budget;
}
/* no more packet in rx/tx queue, remove device from poll

27
target/linux/brcm63xx/patches-3.18/426-bcm63xx_enet-fix-napi-poll-return-value.patch Normal file
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@ -0,0 +1,27 @@
From d150ac8f353cb1ab59288829db006300120c9daf Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Sat, 28 Feb 2015 20:23:13 +0100
Subject: [PATCH] bcm63xx_enet: fix napi poll return value
Commit d75b1ade567ffab ("net: less interrupt masking in NAPI") changed
the way how napi treated a returnvalue < budget, which causes hangs when
there there was tx_work_done, but rx_work_done is less than budget.
To fix this, return budget instead of rx_done to ensure repolling.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -508,7 +508,7 @@ static int bcm_enet_poll(struct napi_str
if (rx_work_done >= budget || tx_work_done > 0) {
/* rx/tx queue is not yet empty/clean */
- return rx_work_done;
+ return budget;
}
/* no more packet in rx/tx queue, remove device from poll