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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Masaru Nagai <masaru.nagai.vx@renesas.com>,
	Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>,
	Simon Horman <horms+renesas@verge.net.au>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.20 14/52] ravb: Decrease TxFIFO depth of Q3 and Q2 to one
Date: Mon, 18 Mar 2019 10:25:01 +0100	[thread overview]
Message-ID: <20190318083845.107485810@linuxfoundation.org> (raw)
In-Reply-To: <20190318083843.398913295@linuxfoundation.org>

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masaru Nagai <masaru.nagai.vx@renesas.com>

[ Upstream commit ae9819e339b451da7a86ab6fe38ecfcb6814e78a ]

Hardware has the CBS (Credit Based Shaper) which affects only Q3
and Q2. When updating the CBS settings, even if the driver does so
after waiting for Tx DMA finished, there is a possibility that frame
data still remains in TxFIFO.

To avoid this, decrease TxFIFO depth of Q3 and Q2 to one.

This patch has been exercised this using netperf TCP_MAERTS, TCP_STREAM
and UDP_STREAM tests run on an Ebisu board. No performance change was
detected, outside of noise in the tests, both in terms of throughput and
CPU utilisation.

Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Masaru Nagai <masaru.nagai.vx@renesas.com>
Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
[simon: updated changelog]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/renesas/ravb_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -467,7 +467,7 @@ static int ravb_dmac_init(struct net_dev
 		   RCR_EFFS | RCR_ENCF | RCR_ETS0 | RCR_ESF | 0x18000000, RCR);
 
 	/* Set FIFO size */
-	ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00222200, TGC);
+	ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00112200, TGC);
 
 	/* Timestamp enable */
 	ravb_write(ndev, TCCR_TFEN, TCCR);



  parent reply	other threads:[~2019-03-18  9:31 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-18  9:24 [PATCH 4.20 00/52] 4.20.17-stable review Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 01/52] connector: fix unsafe usage of ->real_parent Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 02/52] gro_cells: make sure device is up in gro_cells_receive() Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 03/52] ipv4/route: fail early when inet dev is missing Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 04/52] l2tp: fix infoleak in l2tp_ip6_recvmsg() Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 05/52] lan743x: Fix RX Kernel Panic Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 06/52] lan743x: Fix TX Stall Issue Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 07/52] net: hns3: add dma_rmb() for rx description Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 08/52] net: hsr: fix memory leak in hsr_dev_finalize() Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 09/52] net/hsr: fix possible crash in add_timer() Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 10/52] net: sit: fix UBSAN Undefined behaviour in check_6rd Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 11/52] net/x25: fix use-after-free in x25_device_event() Greg Kroah-Hartman
2019-03-18  9:24 ` [PATCH 4.20 12/52] net/x25: reset state in x25_connect() Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 13/52] pptp: dst_release sk_dst_cache in pptp_sock_destruct Greg Kroah-Hartman
2019-03-18  9:25 ` Greg Kroah-Hartman [this message]
2019-03-18  9:25 ` [PATCH 4.20 15/52] route: set the deleted fnhe fnhe_daddr to 0 in ip_del_fnhe to fix a race Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 16/52] rxrpc: Fix client call queueing, waiting for channel Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 17/52] sctp: remove sched init from sctp_stream_init Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 18/52] tcp: do not report TCP_CM_INQ of 0 for closed connections Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 19/52] tcp: Dont access TCP_SKB_CB before initializing it Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 20/52] tcp: handle inet_csk_reqsk_queue_add() failures Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 21/52] vxlan: Fix GRO cells race condition between receive and link delete Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 22/52] vxlan: test dev->flags & IFF_UP before calling gro_cells_receive() Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 23/52] net/mlx4_core: Fix reset flow when in command polling mode Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 24/52] net/mlx4_core: Fix locking in SRIOV mode when switching between events and polling Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 25/52] net/mlx4_core: Fix qp mtt size calculation Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 26/52] net: sched: flower: insert new filter to idr after setting its mask Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 27/52] tcp: repaired skbs must init their tso_segs Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 28/52] net/x25: fix a race in x25_bind() Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 29/52] mdio_bus: Fix use-after-free on device_register fails Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 30/52] net: Set rtm_table to RT_TABLE_COMPAT for ipv6 for tables > 255 Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 31/52] ipv6: route: purge exception on removal Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 32/52] team: use operstate consistently for linkup Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 33/52] ipvlan: disallow userns cap_net_admin to change global mode/flags Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 34/52] ipv6: route: enforce RCU protection in rt6_update_exception_stamp_rt() Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 35/52] ipv6: route: enforce RCU protection in ip6_route_check_nh_onlink() Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 36/52] bonding: fix PACKET_ORIGDEV regression Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 37/52] net/smc: fix smc_poll in SMC_INIT state Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 38/52] missing barriers in some of unix_sock ->addr and ->path accesses Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 39/52] f2fs: wait on atomic writes to count F2FS_CP_WB_DATA Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 40/52] perf/x86: Fixup typo in stub functions Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 41/52] ALSA: bebob: use more identical mod_alias for Saffire Pro 10 I/O against Liquid Saffire 56 Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 42/52] ALSA: firewire-motu: fix construction of PCM frame for capture direction Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 43/52] ALSA: hda: Extend i915 component bind timeout Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 44/52] ALSA: hda - add more quirks for HP Z2 G4 and HP Z240 Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 45/52] ALSA: hda/realtek: Enable audio jacks of ASUS UX362FA with ALC294 Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 46/52] ALSA: hda/realtek - Reduce click noise on Dell Precision 5820 headphone Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 47/52] ALSA: hda/realtek: Enable headset MIC of Acer TravelMate X514-51T with ALC255 Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 48/52] perf/x86/intel: Fix memory corruption Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 49/52] perf/x86/intel: Make dev_attr_allow_tsx_force_abort static Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 50/52] Its wrong to add len to sector_nr in raid10 reshape twice Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 51/52] drm: Block fb changes for async plane updates Greg Kroah-Hartman
2019-03-18  9:25 ` [PATCH 4.20 52/52] vhost/vsock: fix vhost vsock cid hashing inconsistent Greg Kroah-Hartman
2019-03-19  2:26 ` [PATCH 4.20 00/52] 4.20.17-stable review Guenter Roeck
2019-03-19  2:52 ` Naresh Kamboju
2019-03-19 10:34 ` Jon Hunter

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