[dpdk-dev] Issue with net/netvsc pmd in 18.11.9

[Dey, Souvik]

Hi All,
      I updated from dpdk 18.11.6 to 18.11.9 and my netvsc pmd stopped working as expected. Firstly, I saw a crash in tx packets as soon as the dpdk app comes up. In doing some googling found a bug that was fixed after 18.11.9 https://patches.dpdk.org/patch/75001/ . Ported this fix and was able to get rid of the seg fault, but now stuck at another issue. When we are transmitting packets of size within HN_TXCOPY_THRESHOLD we are all good but any larger packets/fragmented packets are getting dropped after some time. As soon as we start to receive the transmit completion event NVS_TYPE_RNDIS_ACK as failed, packets with size greater than HN_TXCOPY_THRESHOLD starts to drop and never recovers. Packets less than HN_TXCOPY_THRESHOLD works properly there after though. Any idea why this is happening and is there is some fix which is already there which is done after 18.11.9 release ?
We are at the critical part of our release, so any help in this regard will be highly appreciated. Thanks in advance for all the help.

PS: I also tried to put the net/netvsc: return the correct chimney index <https://patches.dpdk.org/patch/75118/>  fix in but nothing changed.

--
Regards,
Souvik

Log Snippet:
I can see the below errors coming after some transmitting.
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_flush_txagg() tx: port 2:0 tx 2048 size 302
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 2048 packets 1 bytes 242

hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_flush_txagg() tx: port 2:0 tx 2624 size 302
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 packets 1 bytes 1514
hn_nvs_send_completed() tx: port 2:0 complete tx 2624 packets 1 bytes 242

hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 3 size 0
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_flush_txagg() tx: port 2:0 tx 2688 size 302
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_nvs_send_completed() tx: port 2:0 complete tx 2688 packets 1 bytes 242
hn_flush_txagg() tx: port 2:0 tx 3264 size 571
hn_nvs_send_completed() tx: port 2:0 complete tx 3264 packets 1 bytes 511
hn_rxpkt() rx: port 2:0 RX id 3 size 511 type 0x11 ol_flags 0x2
hn_flush_txagg() tx: port 2:0 tx 3328 size 571
hn_nvs_send_completed() tx: port 2:0 complete tx 3328 packets 1 bytes 511
hn_rxpkt() rx: port 2:0 RX id 3 size 512 type 0x11 ol_flags 0x2
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_rxpkt() rx: port 2:0 RX id 3 size 512 type 0x11 ol_flags 0x2
hn_xmit_sg() tx: port 2:0 tx 4294967295 segs 2 size 0
hn_nvs_send_completed() tx: port 2:0 complete tx 4294967295 failed status 2
hn_flush_txagg() tx: port 2:0 tx 3392 size 120
hn_nvs_send_completed() tx: port 2:0 complete tx 3392 packets 1 bytes 60
hn_rxpkt() rx: port 2:0 RX id 3 size 42 type 0x1 ol_flags 0