Re: [dpdk-dev] dpdk16.07 and virtio "Cannot mmap IO port resource"

[Gopakumar Choorakkot Edakkunni <gopakumar.c.e@gmail.com>]

Hi Oliver,

Looking at the kernel code pci_mmap_resource()--->pci_mmap_fits(), it looks
like pci_mmap_fits() expects that the "number of pages" requested to map is
no larger than the actual size of the pci resource. But in
pci_uio_ioport_map() what is passed as the requested size is the end_addr
of the resource, which in my case is 0xc09f, but the size of the resource
itself is 0x20 and hence kernel expects one page - but 0xc09f+1
(end_addr+1) gets translated to 13 pages ! And I guess that leads to the
mmap to fail .. Thoughts on this ?

Rgds,
Gopa.


On Fri, Dec 9, 2016 at 8:30 PM, Gopakumar Choorakkot Edakkunni <
gopakumar.c.e@gmail.com> wrote:

> I tried to load up dpdk (bound to uio_pci_generic, tried igb_uio also!) on
> a virtio interface. Dpdk exits with the "Cannot mmap IO port resource"
> complaint - the call chain is legacy_virtio_resource_init()-->pci_uio_ioport_map().
>
>
> If anyone can give any clues/pointers as to what might be wrong, that can
> greatly help in getting me on the right track fast !
>
> ---
> EAL:   probe driver: 1af4:1000 rte_virtio_pmd
> EAL: PCI device 0000:00:05.0 on NUMA socket 0
> EAL:   probe driver: 1af4:1000 r[  330.753458] ------------[ cut here
> ]------------
> rte_virtio_pmd
> [  330.754430] WARNING: CPU: 0 PID: 8063 at drivers/pci/pci-sysfs.c:984
> pci_mmap_resource.isra.14+0x113/0x1b0()
> [  330.756083] process "dpdk_master" tried to map 0x0000d000 bytes at page
> 0x00000000 on 0000:00:05.0 BAR 0 (start 0x            c080, size
> 0x              20)
> [  330.758272] Modules linked in: rte_kni igb_uio pppoe ppp_async
> iptable_nat cdc_mbim sierra_net rndis_host qmi_wwan qcserial pppox
> ppp_generic option nf_nat_pptp nf_nat_ipv4 nf_nat_amanda nf_conntrack_pptp
> nf_conntrack_ipv4 nf_conntrack_amanda ipt_MASQUERADE huawei_cdc_ncm
> cdc_subset cdc_ncm cdc_ether cdc_eem ax88179_178a asix xt_u32 xt_time
> xt_tcpmss xt_string xt_statistic xt_state xt_socket xt_recent xt_quota
> xt_pkttype xt_physdev xt_owner xt_nat xt_multiport xt_mark xt_mac xt_limit
> xt_length xt_iprange xt_id xt_hl xt_helper xt_hashlimit xt_esp xt_ecn
> xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment
> xt_addrtype xt_TPROXY xt_TEE xt_TCPMSS xt_REDIRECT xt_NETMAP xt_LOG xt_LED
> xt_HL xt_DSCP xt_CT xt_CLASSIFY usbnet usb_wwan ts_kmp ts_fsm ts_bm slhc
> sierra pl2303 nfnetlink_queue nfnetlink_log nf_nat_tftp nf_nat_snmp_basic
> nf_nat_sip nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat
> nf_defrag_ipv4 nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_sip
> nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_irc
> nf_conntrack_h323 nf_conntrack_ftp nf_conntrack_broadcast
> lib80211_crypt_wep lib80211_crypt_tkip lib80211_crypt_ccmp lib80211
> iptable_raw iptable_mangle iptable_filter ipt_ah ipt_ULOG ipt_REJECT
> ipt_ECN hso ftdi_sio crc8 crc7 crc_itu_t crc_ccitt cp210x cordic
> compat_xtables cdc_wdm cdc_acm arptable_filter arpt_mangle arp_tables
> sch_teql sch_tbf sch_sfq sch_red sch_prio sch_netem sch_htb sch_gred
> sch_dsmark sch_codel em_text em_nbyte em_meta em_cmp cls_basic act_police
> act_ipt act_connmark act_skbedit act_mirred em_u32 cls_u32 cls_tcindex
> cls_flow cls_route cls_fw sch_hfsc sch_ingress evdev xt_NFQUEUE xt_set
> ip_set_list_set ip_set_hash_netport ip_set_hash_netiface ip_set_hash_net
> ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport
> ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip
> ip_set nfnetlink sr_mod cdrom ip6t_REJECT ip6table_raw ip6table_mangle
> ip6table_filter ip6_tables nf_conntrack_ipv6 nf_conntrack nf_defrag_ipv6
> ifb ipip ip6_tunnel tunnel6 tunnel4 ip_tunnel tun mdio loop vfat fat isofs
> nls_utf8 nls_iso8859_15 nls_iso8859_1 nls_cp850 nls_cp437 rfkill virtio_rng
> sha512_generic sha256_generic sha1_generic md5 arc4 ath10k_pci ath10k_core
> ath9k ath9k_common ath9k_hw ath mac80211 cfg80211 compat pcnet32 e1000
> virtio_net ohci_hcd ixgbevf ixgbe hwmon igbvf igb dsa_core mii [last
> unloaded: igb_uio]
> [  330.805110] CPU: 0 PID: 8063 Comm: dpdk_master Tainted: G        W
> 3.14.67 #1
> [  330.806104] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Bochs 01/01/2011
> [  330.806104]  0000000000000286 0000000000000000 ffffffff814e167c
> 0000000000000006
> [  330.806104]  ffff88008b573cd8 ffffffff81259d73 ffffffff81061b72
> ffff88013b24fae0
> [  330.806104]  ffff88013b24f800 0000000000000000 ffff88013a498000
> ffff88013b24f8a8
> [  330.806104] Call Trace:
> [  330.806104]  [<ffffffff814e167c>] ? dump_stack+0x5e/0x7a
> [  330.806104]  [<ffffffff81259d73>] ? pci_mmap_resource.isra.14+0x11
> 3/0x1b0
> [  330.806104]  [<ffffffff81061b72>] ? warn_slowpath_common+0x82/0xb0
> [  330.806104]  [<ffffffff81061c55>] ? warn_slowpath_fmt+0x45/0x50
> [  330.806104]  [<ffffffff81120321>] ? do_last.isra.58+0xac1/0xc00
> [  330.806104]  [<ffffffff81259d73>] ? pci_mmap_resource.isra.14+0x11
> 3/0x1b0
> [  330.806104]  [<ffffffff8116da79>] ? kernfs_fop_mmap+0x69/0x100
> [  330.806104]  [<ffffffff810f4018>] ? mmap_region+0x2e8/0x560
> [  330.806104]  [<ffffffff810f45a8>] ? do_mmap_pgoff+0x318/0x3b0
> [  330.806104]  [<ffffffff810e1724>] ? vm_mmap_pgoff+0x74/0xc0
> [  330.806104]  [<ffffffff810f2d1a>] ? SyS_mmap_pgoff+0x18a/0x1e0
> [  330.806104]  [<ffffffff814e7759>] ? system_call_fastpath+0x16/0x1b
> [  330.823897] ---[ end trace c6106b67c768d501 ]---
> EAL: Cannot mmap IO port resource: Invalid argument
> EAL: Error - exiting with code: 1
>   Cause: Requested device 0000:00:05.0 cannot be used
>