Re: DPDK Secondary process not able to xmit packets with MLX5 VF

[Samar Yadav <samar.yadav@broadcom.com>]

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Hi Slava,
Thanks so much for replying, appreciate it.

>> Did you start queues in the secondary process?
Yes, tx_queue_state in secondary process is RTE_ETH_QUEUE_STATE_STARTED,

*gdb output from secondary process for port1 (non-working port, managed by
secondary process) *
(gdb) p rte_eth_devices[1]->data[0]
$3 = {name = "0000:00:08.0", '\000' <repeats 51 times>, rx_queues =
0x600177c28980, tx_queues = 0x600177c26900, nb_rx_queues = 1, nb_tx_queues =
1, sriov = {active = 0 '\000', nb_q_per_pool = 0 '\000', def_vmdq_idx = 0,
def_pool_q_idx = 0}, dev_private = 0x600177c6d7c0, dev_link = {
link_speed = 40000, link_duplex = 1, link_autoneg = 1, link_status = 1},
dev_conf = {link_speeds = 0, rxmode = {mq_mode = RTE_ETH_MQ_RX_NONE, mtu =
9000, max_lro_pkt_size = 0, offloads = 8193, reserved_64s = {0, 0},
reserved_ptrs = {0x0, 0x0}}, txmode = {mq_mode = RTE_ETH_MQ_TX_NONE,
offloads = 32815, pvid = 0, hw_vlan_reject_tagged = 0 '\000',
hw_vlan_reject_untagged = 0 '\000', hw_vlan_insert_pvid = 0 '\000',
reserved_64s = {0, 0}, reserved_ptrs = {0x0, 0x0}}, lpbk_mode = 0,
rx_adv_conf = {rss_conf = {rss_key = 0x0, rss_key_len = 0 '\000', rss_hf = 0},
vmdq_dcb_conf = {
nb_queue_pools = (unknown: 0), enable_default_pool = 0 '\000', default_pool
= 0 '\000', nb_pool_maps = 0 '\000', pool_map = {{vlan_id = 0, pools = 0} <
repeats 64 times>}, dcb_tc = "\000\000\000\000\000\000\000"}, dcb_rx_conf =
{nb_tcs = (unknown: 0),
dcb_tc = "\000\000\000\000\000\000\000"}, vmdq_rx_conf = {nb_queue_pools = (
unknown: 0), enable_default_pool = 0 '\000', default_pool = 0 '\000',
enable_loop_back = 0 '\000', nb_pool_maps = 0 '\000', rx_mode = 0, pool_map
= {{vlan_id = 0, pools = 0} <repeats 64 times>}}}, tx_adv_conf = {
vmdq_dcb_tx_conf = {nb_queue_pools = (unknown: 0), dcb_tc = "
\000\000\000\000\000\000\000"}, dcb_tx_conf = {nb_tcs = (unknown: 0), dcb_tc
= "\000\000\000\000\000\000\000"}, vmdq_tx_conf = {nb_queue_pools = (unknown:
0)}}, dcb_capability_en = 0, intr_conf = {lsc = 1, rxq = 0, rmv = 0}},
mtu = 1500, min_rx_buf_size = 4294967295, rx_mbuf_alloc_failed = 0,
mac_addrs = 0x600177c6d7e0, mac_pool_sel = {0 <repeats 128 times>},
hash_mac_addrs = 0x0, port_id = 1, promiscuous = 1 '\001', scattered_rx = 0
'\000', all_multicast = 1 '\001', dev_started = 1 '\001', lro = 0 '\000',
dev_configured = 1 '\001', flow_configured = 0 '\000', rx_queue_state = "
\001", '\000' <repeats 1022 times>, tx_queue_state = "\001", '\000' <repeats
1022 times>, dev_flags = 75, numa_node = -1, vlan_filter_conf = {ids = {0 <
repeats 64 times>}}, owner = {id = 0, name = '\000' <repeats 63 times>},
representor_id = 0, backer_port_id = 32, flow_ops_mutex = {__data = {__lock
= 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0,
__elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <
repeats 39 times>, __align = 0}}
(gdb) p rte_eth_devices[1]
$4 = {rx_pkt_burst = 0x5591d17ddfb2 <mlx5_rx_burst>, tx_pkt_burst =
0x5591d197268c <mlx5_tx_burst_full>, tx_pkt_prepare = 0x0, rx_queue_count =
0x0, rx_descriptor_status = 0x5591d17dc903 <mlx5_rx_descriptor_status>,
tx_descriptor_status = 0x5591d17f8dd0 <mlx5_tx_descriptor_status>,
data = 0x600177cfb500, process_private = 0x600179b1b500, dev_ops =
0x5591d20ac180 <mlx5_dev_sec_ops>, device = 0x5591d5a55be0, intr_handle =
0x5591d5a54dd0, link_intr_cbs = {tqh_first = 0x0, tqh_last = 0x5591d3c575d8
<rte_eth_devices+16600>}, post_rx_burst_cbs = {0x600177c00180,
0x0 <repeats 1023 times>}, pre_tx_burst_cbs = {0x600179e52d80, 0x0 <repeats
1023 times>}, state = RTE_ETH_DEV_ATTACHED, security_ctx = 0x0}

*gdb output from primary process for port1 (non-working port, managed by
secondary process)*
(gdb) p rte_eth_devices[1]
$3 = {rx_pkt_burst = 0x5591d17ddfb2 <mlx5_rx_burst>, tx_pkt_burst =
0x5591d197268c <mlx5_tx_burst_full>, tx_pkt_prepare = 0x0, rx_queue_count =
0x5591d17dcd20 <mlx5_rx_queue_count>, rx_descriptor_status = 0x5591d17dc903
<mlx5_rx_descriptor_status>,
tx_descriptor_status = 0x5591d17f8dd0 <mlx5_tx_descriptor_status>, data =
0x600177cfb500, process_private = 0x600177c68540, dev_ops = 0x5591d20abde0
<mlx5_dev_ops>, device = 0x5591d6076440, intr_handle = 0x5591d60d0350,
link_intr_cbs = {tqh_first = 0x0,
tqh_last = 0x5591d3c575d8 <rte_eth_devices+16600>}, post_rx_burst_cbs = {0x0
<repeats 1024 times>}, pre_tx_burst_cbs = {0x0 <repeats 1024 times>}, state
= RTE_ETH_DEV_ATTACHED, security_ctx = 0x0}
(gdb) p rte_eth_devices[1]->data[0]
$4 = {name = "0000:00:08.0", '\000' <repeats 51 times>, rx_queues =
0x600177c28980, tx_queues = 0x600177c26900, nb_rx_queues = 1, nb_tx_queues =
1, sriov = {active = 0 '\000', nb_q_per_pool = 0 '\000', def_vmdq_idx = 0,
def_pool_q_idx = 0}, dev_private = 0x600177c6d7c0, dev_link = {
link_speed = 40000, link_duplex = 1, link_autoneg = 1, link_status = 1},
dev_conf = {link_speeds = 0, rxmode = {mq_mode = RTE_ETH_MQ_RX_NONE, mtu =
9000, max_lro_pkt_size = 0, offloads = 8193, reserved_64s = {0, 0},
reserved_ptrs = {0x0, 0x0}}, txmode = {mq_mode = RTE_ETH_MQ_TX_NONE,
offloads = 32815, pvid = 0, hw_vlan_reject_tagged = 0 '\000',
hw_vlan_reject_untagged = 0 '\000', hw_vlan_insert_pvid = 0 '\000',
reserved_64s = {0, 0}, reserved_ptrs = {0x0, 0x0}}, lpbk_mode = 0,
rx_adv_conf = {rss_conf = {rss_key = 0x0, rss_key_len = 0 '\000', rss_hf = 0},
vmdq_dcb_conf = {
nb_queue_pools = (unknown: 0), enable_default_pool = 0 '\000', default_pool
= 0 '\000', nb_pool_maps = 0 '\000', pool_map = {{vlan_id = 0, pools = 0} <
repeats 64 times>}, dcb_tc = "\000\000\000\000\000\000\000"}, dcb_rx_conf =
{nb_tcs = (unknown: 0),
dcb_tc = "\000\000\000\000\000\000\000"}, vmdq_rx_conf = {nb_queue_pools = (
unknown: 0), enable_default_pool = 0 '\000', default_pool = 0 '\000',
enable_loop_back = 0 '\000', nb_pool_maps = 0 '\000', rx_mode = 0, pool_map
= {{vlan_id = 0, pools = 0} <repeats 64 times>}}}, tx_adv_conf = {
vmdq_dcb_tx_conf = {nb_queue_pools = (unknown: 0), dcb_tc = "
\000\000\000\000\000\000\000"}, dcb_tx_conf = {nb_tcs = (unknown: 0), dcb_tc
= "\000\000\000\000\000\000\000"}, vmdq_tx_conf = {nb_queue_pools = (unknown:
0)}}, dcb_capability_en = 0, intr_conf = {lsc = 1, rxq = 0, rmv = 0}},
mtu = 1500, min_rx_buf_size = 4294967295, rx_mbuf_alloc_failed = 0,
mac_addrs = 0x600177c6d7e0, mac_pool_sel = {0 <repeats 128 times>},
hash_mac_addrs = 0x0, port_id = 1, promiscuous = 1 '\001', scattered_rx = 0
'\000', all_multicast = 1 '\001', dev_started = 1 '\001', lro = 0 '\000',
dev_configured = 1 '\001', flow_configured = 0 '\000', rx_queue_state = "
\001", '\000' <repeats 1022 times>, tx_queue_state = "\001", '\000' <repeats
1022 times>, dev_flags = 75, numa_node = -1, vlan_filter_conf = {ids = {0 <
repeats 64 times>}}, owner = {id = 0, name = '\000' <repeats 63 times>},
representor_id = 0, backer_port_id = 32, flow_ops_mutex = {__data = {__lock
= 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0,
__elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <
repeats 39 times>, __align = 0}}
(gdb)

*gdb output from secondary process for port0 (working port, managed by
primary process) *
(gdb) p rte_eth_devices[0]
$1 = {rx_pkt_burst = 0x5591d17ddfb2 <mlx5_rx_burst>, tx_pkt_burst =
0x5591d197268c <mlx5_tx_burst_full>, tx_pkt_prepare = 0x0, rx_queue_count =
0x0, rx_descriptor_status = 0x5591d17dc903 <mlx5_rx_descriptor_status>,
tx_descriptor_status = 0x5591d17f8dd0 <mlx5_tx_descriptor_status>,
data = 0x600177cf9d00, process_private = 0x600179e49440, dev_ops =
0x5591d20ac180 <mlx5_dev_sec_ops>, device = 0x5591d5a55fa0, intr_handle =
0x5591d5a4dd20, link_intr_cbs = {tqh_first = 0x0, tqh_last = 0x5591d3c53558
<rte_eth_devices+88>}, post_rx_burst_cbs = {0x0 <repeats 1024 times>},
pre_tx_burst_cbs = {0x0 <repeats 1024 times>}, state = RTE_ETH_DEV_ATTACHED,
security_ctx = 0x0}
(gdb) p rte_eth_devices[0]->data[0]
$2 = {name = "0000:00:07.0", '\000' <repeats 51 times>, rx_queues =
0x600176c9c980, tx_queues = 0x600176c9a900, nb_rx_queues = 1, nb_tx_queues =
1, sriov = {active = 0 '\000', nb_q_per_pool = 0 '\000', def_vmdq_idx = 0,
def_pool_q_idx = 0}, dev_private = 0x600177d29d80, dev_link = {
link_speed = 40000, link_duplex = 1, link_autoneg = 1, link_status = 1},
dev_conf = {link_speeds = 0, rxmode = {mq_mode = RTE_ETH_MQ_RX_NONE, mtu =
9000, max_lro_pkt_size = 0, offloads = 8193, reserved_64s = {0, 0},
reserved_ptrs = {0x0, 0x0}}, txmode = {mq_mode = RTE_ETH_MQ_TX_NONE,
offloads = 32815, pvid = 0, hw_vlan_reject_tagged = 0 '\000',
hw_vlan_reject_untagged = 0 '\000', hw_vlan_insert_pvid = 0 '\000',
reserved_64s = {0, 0}, reserved_ptrs = {0x0, 0x0}}, lpbk_mode = 0,
rx_adv_conf = {rss_conf = {rss_key = 0x0, rss_key_len = 0 '\000', rss_hf = 0},
vmdq_dcb_conf = {
nb_queue_pools = (unknown: 0), enable_default_pool = 0 '\000', default_pool
= 0 '\000', nb_pool_maps = 0 '\000', pool_map = {{vlan_id = 0, pools = 0} <
repeats 64 times>}, dcb_tc = "\000\000\000\000\000\000\000"}, dcb_rx_conf =
{nb_tcs = (unknown: 0),
dcb_tc = "\000\000\000\000\000\000\000"}, vmdq_rx_conf = {nb_queue_pools = (
unknown: 0), enable_default_pool = 0 '\000', default_pool = 0 '\000',
enable_loop_back = 0 '\000', nb_pool_maps = 0 '\000', rx_mode = 0, pool_map
= {{vlan_id = 0, pools = 0} <repeats 64 times>}}}, tx_adv_conf = {
vmdq_dcb_tx_conf = {nb_queue_pools = (unknown: 0), dcb_tc = "
\000\000\000\000\000\000\000"}, dcb_tx_conf = {nb_tcs = (unknown: 0), dcb_tc
= "\000\000\000\000\000\000\000"}, vmdq_tx_conf = {nb_queue_pools = (unknown:
0)}}, dcb_capability_en = 0, intr_conf = {lsc = 1, rxq = 0, rmv = 0}},
mtu = 1500, min_rx_buf_size = 4294967295, rx_mbuf_alloc_failed = 0,
mac_addrs = 0x600177d29da0, mac_pool_sel = {0 <repeats 128 times>},
hash_mac_addrs = 0x0, port_id = 0, promiscuous = 1 '\001', scattered_rx = 0
'\000', all_multicast = 1 '\001', dev_started = 1 '\001', lro = 0 '\000',
dev_configured = 1 '\001', flow_configured = 0 '\000', rx_queue_state = "
\001", '\000' <repeats 1022 times>, tx_queue_state = "\001", '\000' <repeats
1022 times>, dev_flags = 75, numa_node = -1, vlan_filter_conf = {ids = {0 <
repeats 64 times>}}, owner = {id = 0, name = '\000' <repeats 63 times>},
representor_id = 0, backer_port_id = 32, flow_ops_mutex = {__data = {__lock
= 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0,
__elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <
repeats 39 times>, __align = 0}}

*gdb output from primary process for port0 (working port, managed by
primary process)*
(gdb) p rte_eth_devices[0]
$1 = {rx_pkt_burst = 0x5591d17ddfb2 <mlx5_rx_burst>, tx_pkt_burst =
0x5591d197268c <mlx5_tx_burst_full>, tx_pkt_prepare = 0x0, rx_queue_count =
0x5591d17dcd20 <mlx5_rx_queue_count>, rx_descriptor_status = 0x5591d17dc903
<mlx5_rx_descriptor_status>,
tx_descriptor_status = 0x5591d17f8dd0 <mlx5_tx_descriptor_status>, data =
0x600177cf9d00, process_private = 0x600176cdc600, dev_ops = 0x5591d20abde0
<mlx5_dev_ops>, device = 0x5591d6076800, intr_handle = 0x5591d606e580,
link_intr_cbs = {tqh_first = 0x0,
tqh_last = 0x5591d3c53558 <rte_eth_devices+88>}, post_rx_burst_cbs = {
0x600177c69100, 0x0 <repeats 1023 times>}, pre_tx_burst_cbs = {
0x600179e52cc0, 0x0 <repeats 1023 times>}, state = RTE_ETH_DEV_ATTACHED,
security_ctx = 0x0}
(gdb) p rte_eth_devices[0]->data[0]
$2 = {name = "0000:00:07.0", '\000' <repeats 51 times>, rx_queues =
0x600176c9c980, tx_queues = 0x600176c9a900, nb_rx_queues = 1, nb_tx_queues =
1, sriov = {active = 0 '\000', nb_q_per_pool = 0 '\000', def_vmdq_idx = 0,
def_pool_q_idx = 0}, dev_private = 0x600177d29d80, dev_link = {
link_speed = 40000, link_duplex = 1, link_autoneg = 1, link_status = 1},
dev_conf = {link_speeds = 0, rxmode = {mq_mode = RTE_ETH_MQ_RX_NONE, mtu =
9000, max_lro_pkt_size = 0, offloads = 8193, reserved_64s = {0, 0},
reserved_ptrs = {0x0, 0x0}}, txmode = {mq_mode = RTE_ETH_MQ_TX_NONE,
offloads = 32815, pvid = 0, hw_vlan_reject_tagged = 0 '\000',
hw_vlan_reject_untagged = 0 '\000', hw_vlan_insert_pvid = 0 '\000',
reserved_64s = {0, 0}, reserved_ptrs = {0x0, 0x0}}, lpbk_mode = 0,
rx_adv_conf = {rss_conf = {rss_key = 0x0, rss_key_len = 0 '\000', rss_hf = 0},
vmdq_dcb_conf = {
nb_queue_pools = (unknown: 0), enable_default_pool = 0 '\000', default_pool
= 0 '\000', nb_pool_maps = 0 '\000', pool_map = {{vlan_id = 0, pools = 0} <
repeats 64 times>}, dcb_tc = "\000\000\000\000\000\000\000"}, dcb_rx_conf =
{nb_tcs = (unknown: 0),
dcb_tc = "\000\000\000\000\000\000\000"}, vmdq_rx_conf = {nb_queue_pools = (
unknown: 0), enable_default_pool = 0 '\000', default_pool = 0 '\000',
enable_loop_back = 0 '\000', nb_pool_maps = 0 '\000', rx_mode = 0, pool_map
= {{vlan_id = 0, pools = 0} <repeats 64 times>}}}, tx_adv_conf = {
vmdq_dcb_tx_conf = {nb_queue_pools = (unknown: 0), dcb_tc = "
\000\000\000\000\000\000\000"}, dcb_tx_conf = {nb_tcs = (unknown: 0), dcb_tc
= "\000\000\000\000\000\000\000"}, vmdq_tx_conf = {nb_queue_pools = (unknown:
0)}}, dcb_capability_en = 0, intr_conf = {lsc = 1, rxq = 0, rmv = 0}},
mtu = 1500, min_rx_buf_size = 4294967295, rx_mbuf_alloc_failed = 0,
mac_addrs = 0x600177d29da0, mac_pool_sel = {0 <repeats 128 times>},
hash_mac_addrs = 0x0, port_id = 0, promiscuous = 1 '\001', scattered_rx = 0
'\000', all_multicast = 1 '\001', dev_started = 1 '\001', lro = 0 '\000',
dev_configured = 1 '\001', flow_configured = 0 '\000', rx_queue_state = "
\001", '\000' <repeats 1022 times>, tx_queue_state = "\001", '\000' <repeats
1022 times>, dev_flags = 75, numa_node = -1, vlan_filter_conf = {ids = {0 <
repeats 64 times>}}, owner = {id = 0, name = '\000' <repeats 63 times>},
representor_id = 0, backer_port_id = 32, flow_ops_mutex = {__data = {__lock
= 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0,
__elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <
repeats 39 times>, __align = 0}}


>> Only one process in any moment of time manages the queue, no shared
(between process) queue data sending is allowed.
Yes, we are using proc1(secondary process) to manage the port 1 and proc0
(primary process) to manage port0 . There is no sharing of the queue
between processes for sending data.

>> From your description it looks like there is no completions seen (in
CQE), I would recommend checking the UAR/Doorbell mapping in secondary
process

Below are the logs from mlx5_txq_devx_obj_new which is called by
proc0(rte_proc_primary) for port 1

Core:0 04/10/24 06:45:47.626580 UTC mlx5_net: Core 0
mlx5_txq_devx_obj_new 1563 ppriv: 0x600177c68540 ,ppriv->uar_table:
0x600177c68548, txq_ctrl->uar_mmap_offset:0,
ppriv->uar_table[txq_data->idx]:0x7f0411ae3800, txq_data->idx: 0,
txq_data->db_nc:0

and logs from txq_uar_init_secondary which gets called by
proc1(rte_proc_secondary) for port 1

Core:1 04/10/24 06:45:47.767512 UTC mlx5_net:   priv: 0x600177c6d7c0,
priv->sh: 0x600176c25a00, priv->sh->pppriv: 0x600177c68540
Core:1 04/10/24 06:45:47.767528 UTC mlx5_net: Core 1
txq_uar_init_secondary 535 txq_ctrl:0x600177c04980 priv:0x600177c6d7c0
Core:1 04/10/24 06:45:47.767553 UTC mlx5_net: Core 1
txq_uar_init_secondary 562   primary_ppriv->uar_table: 0x600177c68548
,uar_va:7f0411ae3800 offset:800 addr:0x7f0425b18800
Core:1 04/10/24 06:45:47.767604 UTC mlx5_net: Core 1
txq_uar_init_secondary 566 port 1 of txq 0 ppriv:0x600179b1b500
ppriv->uar_table[txq->idx]:0x7f0425b18800, txq->idx:0
        , ppriv->uar_table[0]:0x7f0425b18800,ppriv->uar_table[1]:(nil)


@viacheslavo@nvidia.com <viacheslavo@nvidia.com> I noticed that
data->dev_private->sh->tx_uar.obj has mmap_offset as 0 in VF case but
is non-zero in PF case, Is that okay? this is returned by glue in
using  uar = mlx5_glue->devx_alloc_uar(cdev->ctx, uar_mapping);

VF:

    (gdb) p *(struct mlx5dv_devx_uar *) $7
    $9 = {reg_addr = 0x7f041b02d800, base_addr = 0x7f041b02d000,
page_id = 26, mmap_off = 0, comp_mask = 0}

PF:

        txq_ctrl->uar_mmap_offset:*9441280*,
ppriv->uar_table[txq_data->idx]:0x7ff88d2be800, txq_data->idx: 0,
txq_data->db_nc:0



Also we are using MLNX_OFED_LINUX-5.8-2.0.3.0-ubuntu20.04-x86_64

Please note the MLX PF RSS works fine for us where we have 4 queues there
q0 is managed by primary process(proc0) and q1,q2,q3 managed by secondary
processes proc1,proc2,proc3 respectively. We are only seeing the issue in *MLX
VF.*

If it works better for you, we can get on Zoom call for the same.
Please let us know a convenient time for the same.

Thanks,

Samar

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