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linux_dsm_epyc7002/drivers/net/ethernet/freescale
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Claudiu Manoil 3ba405db1c gianfar: Simplify MQ polling to avoid soft lockup 
Under certain low traffic conditions, the single core
devices with multiple Rx/Tx queues (MQ mode) may reach
soft lockup due to gfar_poll not returning in proper time.
The following exception was obtained using iperf on a 100Mbit
half-duplex link, for a p1010 single core device:

BUG: soft lockup - CPU#0 stuck for 23s! [iperf:2847]
Modules linked in:
CPU: 0 PID: 2847 Comm: iperf Not tainted 3.12.0-rc3 #16
task: e8bf8000 ti: eeb16000 task.ti: ee646000
NIP: c0255b6c LR: c0367ae8 CTR: c0461c18
REGS: eeb17e70 TRAP: 0901   Not tainted  (3.12.0-rc3)
MSR: 00029000 <CE,EE,ME>  CR: 44228428  XER: 20000000

GPR00: c0367ad4 eeb17f20 e8bf8000 ee01f4b4 00000008 ffffffff ffffffff
00000000
GPR08: 000000c0 00000008 000000ff ffffffc0 000193fe
NIP [c0255b6c] find_next_bit+0xb8/0xc4
LR [c0367ae8] gfar_poll+0xc8/0x1d8
Call Trace:
[eeb17f20] [c0367ad4] gfar_poll+0xb4/0x1d8 (unreliable)
[eeb17f70] [c0422100] net_rx_action+0xa4/0x158
[eeb17fa0] [c003ec6c] __do_softirq+0xcc/0x17c
[eeb17ff0] [c000c28c] call_do_softirq+0x24/0x3c
[ee647cc0] [c0004660] do_softirq+0x6c/0x94
[ee647ce0] [c003eb9c] local_bh_enable+0x9c/0xa0
[ee647cf0] [c0454fe8] tcp_prequeue_process+0xa4/0xdc
[ee647d10] [c0457e44] tcp_recvmsg+0x498/0x96c
[ee647d80] [c047b630] inet_recvmsg+0x40/0x64
[ee647da0] [c040ca8c] sock_recvmsg+0x90/0xc0
[ee647e30] [c040edb8] SyS_recvfrom+0x98/0xfc

To prevent this, the outer while() loop has been removed
allowing gfar_poll() to return faster even if there's
still budget left.  Also, there's no need to recompute
the budget per Rx queue anymore.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-10-18 15:54:43 -04:00
..
fs_enet net:drivers/net: Miscellaneous conversions to ETH_ALEN 2013-10-02 17:04:45 -04:00
fec_main.c net: fec: remove deprecated IRQF_DISABLED 2013-09-15 22:01:05 -04:00
fec_mpc52xx_phy.c net: fec_mpc52xx_phy: remove unnecessary dev_set_drvdata() 2013-08-21 12:27:04 -07:00
fec_mpc52xx.c net: ethernet: use platform_{get,set}_drvdata() 2013-05-25 21:27:58 -07:00
fec_mpc52xx.h
fec_ptp.c fec: Only pass pdev in fec_ptp_init() 2013-06-07 14:41:07 -07:00
fec.h net: fec: fix the error to get the previous BD entry 2013-09-04 14:14:54 -04:00
fsl_pq_mdio.c net: fsl_pq_mdio: remove unnecessary dev_set_drvdata() 2013-08-21 12:27:04 -07:00
gianfar_ethtool.c gianfar: Add flow control support 2013-08-13 15:28:53 -07:00
gianfar_ptp.c powerpc/83xx: gianfar_ptp: select 1588 clock source through dts file 2013-09-30 21:17:16 -07:00
gianfar_sysfs.c gianfar: Use netdev_<level> when possible 2013-04-14 15:41:49 -04:00
gianfar.c gianfar: Simplify MQ polling to avoid soft lockup 2013-10-18 15:54:43 -04:00
gianfar.h gianfar: Remove extern from function prototypes 2013-09-24 10:09:27 -04:00
Kconfig NET: FEC: dynamtic check DMA desc buff type 2013-01-04 15:15:39 -08:00
Makefile net: fec: build fec.c and fec_ptp.c to one module 2013-03-25 12:14:57 -04:00
ucc_geth_ethtool.c ucc_geth: Convert ugeth_<level> to pr_<level> 2013-04-14 15:41:49 -04:00
ucc_geth.c net:drivers/net: Miscellaneous conversions to ETH_ALEN 2013-10-02 17:04:45 -04:00
ucc_geth.h
xgmac_mdio.c net: ethernet: use platform_{get,set}_drvdata() 2013-05-25 21:27:58 -07:00