Re: missing hw.em.msix support in FreeBSD 14.0-CURRENT?

Hi Yuri,

Thanks for the update. I am using an Emulab testbed node under the same
type of hardware. Below are the new outputs.
It is supposed to have multiple tx/rx queues under msix. Why are there only
rxq0/txq0? Is it because the CPU has only one core? How can I check if RSS
is supported?

root@s1:~ # sysctl -d dev.em.0.iflib.disable_msix
dev.em.0.iflib.disable_msix: disable MSI-X (default 0)
root@s1:~ # sysctl dev.em.0.iflib.disable_msix
dev.em.0.iflib.disable_msix: 0
root@s1:~ # sysctl dev.em.0.iflib
dev.em.0.iflib.rxq0.rxq_fl0.buf_size: 2048
dev.em.0.iflib.rxq0.rxq_fl0.credits: 1023
dev.em.0.iflib.rxq0.rxq_fl0.cidx: 959
dev.em.0.iflib.rxq0.rxq_fl0.pidx: 958
dev.em.0.iflib.rxq0.cpu: 1
dev.em.0.iflib.txq0.r_abdications: 0
dev.em.0.iflib.txq0.r_restarts: 0
dev.em.0.iflib.txq0.r_stalls: 0
dev.em.0.iflib.txq0.r_starts: 110443
dev.em.0.iflib.txq0.r_drops: 0
dev.em.0.iflib.txq0.r_enqueues: 110444
dev.em.0.iflib.txq0.ring_state: pidx_head: 1903 pidx_tail: 1903 cidx: 1903
state: IDLE
dev.em.0.iflib.txq0.txq_cleaned: 115208
dev.em.0.iflib.txq0.txq_processed: 115251
dev.em.0.iflib.txq0.txq_in_use: 42
dev.em.0.iflib.txq0.txq_cidx_processed: 565
dev.em.0.iflib.txq0.txq_cidx: 525
dev.em.0.iflib.txq0.txq_pidx: 568
dev.em.0.iflib.txq0.no_tx_dma_setup: 0
dev.em.0.iflib.txq0.txd_encap_efbig: 0
dev.em.0.iflib.txq0.tx_map_failed: 0
dev.em.0.iflib.txq0.no_desc_avail: 0
dev.em.0.iflib.txq0.mbuf_defrag_failed: 0
dev.em.0.iflib.txq0.m_pullups: 0
dev.em.0.iflib.txq0.mbuf_defrag: 0
dev.em.0.iflib.txq0.cpu: 0
dev.em.0.iflib.override_nrxds: 0
dev.em.0.iflib.override_ntxds: 0
dev.em.0.iflib.use_logical_cores: 0
dev.em.0.iflib.separate_txrx: 0
dev.em.0.iflib.core_offset: 0
dev.em.0.iflib.tx_abdicate: 0
dev.em.0.iflib.rx_budget: 0
dev.em.0.iflib.disable_msix: 0
dev.em.0.iflib.override_qs_enable: 0
dev.em.0.iflib.override_nrxqs: 0
dev.em.0.iflib.override_ntxqs: 0
dev.em.0.iflib.driver_version: 7.7.8-fbsd
root@s1:~ #


Best Regards,
Cheng Cui


On Sun, May 7, 2023 at 4:18 PM Yuri <yuri@aetern.org> wrote:

> Cheng Cui wrote:
> > Hello,
> >
> > I am using this em(4) driver for some tests. According to the man page
> > below, there should be a "hw.em.msix" sysctl to enable/disable MSI-X
> > style interrupts. But why is it missing in my system below?
> > https://man.freebsd.org/cgi/man.cgi?em(4)
> > <https://man.freebsd.org/cgi/man.cgi?em(4)>
> >
> > root@s1:~ # dmesg | egrep "8254"
> > Timecounter "i8254" frequency 1193182 Hz quality 0
> > Event timer "i8254" frequency 1193182 Hz quality 100
> > em0: <Intel(R) Legacy PRO/1000 MT 82541GI> port 0xdcc0-0xdcff mem
> > 0xdfae0000-0xdfafffff irq 64 at device 7.0 on pci6
> > em1: <Intel(R) Legacy PRO/1000 MT 82541GI> port 0xccc0-0xccff mem
> > 0xdf8e0000-0xdf8fffff irq 65 at device 8.0 on pci7
> > em2: <Intel(R) Legacy PRO/1000 MT 82546EB (Copper)> port 0xbcc0-0xbcff
> > mem 0xdf5e0000-0xdf5fffff irq 106 at device 4.0 on pci9
> > em3: <Intel(R) Legacy PRO/1000 MT 82546EB (Copper)> port 0xbc80-0xbcbf
> > mem 0xdf5c0000-0xdf5dffff irq 107 at device 4.1 on pci9
> > em4: <Intel(R) Legacy PRO/1000 MT 82546EB (Copper)> port 0xacc0-0xacff
> > mem 0xdf3e0000-0xdf3fffff irq 101 at device 3.0 on pci10
> > em5: <Intel(R) Legacy PRO/1000 MT 82546EB (Copper)> port 0xac80-0xacbf
> > mem 0xdf3c0000-0xdf3dffff irq 102 at device 3.1 on pci10
> >
> > root@s1:~ # ifconfig em5
> > em5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >
> options=481009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER,NOMAP>
> > ether 00:04:23:b7:1e:1d
> > inet 10.1.1.2 netmask 0xffffff00 broadcast 10.1.1.255
> > media: Ethernet 1000baseT <full-duplex>
> > status: active
> > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> >
> > root@s1:~ # sysctl hw.em
> > hw.em.max_interrupt_rate: 8000
> > hw.em.eee_setting: 1
> > hw.em.rx_process_limit: 100
> > hw.em.sbp: 0
> > hw.em.smart_pwr_down: 0
> > hw.em.rx_abs_int_delay: 66
> > hw.em.tx_abs_int_delay: 66
> > hw.em.rx_int_delay: 0
> > hw.em.tx_int_delay: 66
> > hw.em.disable_crc_stripping: 0
> > root@s1:~ #
>
> As if_em was converted to iflib, I guess the related sysctl would now be
> dev.em.0.iflib.disable_msix (I could be wrong, don't have h/w to check).
>