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authorDmitri Epshtein <dima@marvell.com>2016-07-06 04:18:58 +0200
committerSasha Levin <alexander.levin@verizon.com>2016-08-03 15:10:43 -0400
commit25334066b50e2bd08aaec68701a10be3544e0e02 (patch)
tree4ac4db303b0c3f12162f2e6599cc172c9590817d /drivers/net
parent43506e749d3f8d7e012a1bc4cb57b18a03ecfee6 (diff)
net: mvneta: set real interrupt per packet for tx_done
[ Upstream commit 06708f81528725148473c0869d6af5f809c6824b ] Commit aebea2ba0f74 ("net: mvneta: fix Tx interrupt delay") intended to set coalescing threshold to a value guaranteeing interrupt generation per each sent packet, so that buffers can be released with no delay. In fact setting threshold to '1' was wrong, because it causes interrupt every two packets. According to the documentation a reason behind it is following - interrupt occurs once sent buffers counter reaches a value, which is higher than one specified in MVNETA_TXQ_SIZE_REG(q). This behavior was confirmed during tests. Also when testing the SoC working as a NAS device, better performance was observed with int-per-packet, as it strongly depends on the fact that all transmitted packets are released immediately. This commit enables NETA controller work in interrupt per sent packet mode by setting coalescing threshold to 0. Signed-off-by: Dmitri Epshtein <dima@marvell.com> Signed-off-by: Marcin Wojtas <mw@semihalf.com> Cc: <stable@vger.kernel.org> # v3.10+ Fixes aebea2ba0f74 ("net: mvneta: fix Tx interrupt delay") Acked-by: Willy Tarreau <w@1wt.eu> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/marvell/mvneta.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index e4c079612100..40161dacc9c7 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -222,7 +222,7 @@
/* Various constants */
/* Coalescing */
-#define MVNETA_TXDONE_COAL_PKTS 1
+#define MVNETA_TXDONE_COAL_PKTS 0 /* interrupt per packet */
#define MVNETA_RX_COAL_PKTS 32
#define MVNETA_RX_COAL_USEC 100