Shailend Chand 40097cd67c gve: Fix TX livelock ... Before this change the transmit taskqueue would enqueue itself when it cannot find space on the NIC ring with the hope that eventually space would be made. This results in the following livelock that only occurs after passing ~200Gbps of TCP traffic for many hours: 100% CPU ┌───────────┐wait on ┌──────────┐ ┌───────────┐ │user thread│ cpu │gve xmit │wait on │gve cleanup│ │with mbuf ├────────►│taskqueue ├────────►│taskqueue │ │uma lock │ │ │ NIC ring│ │ └───────────┘ └──────────┘ space └─────┬─────┘ ▲ │ │ wait on mbuf uma lock │ └───────────────────────────────────────────┘ Further details about the livelock are available on https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281560. After this change, the transmit taskqueue no longer spins till there is room on the NIC ring. It instead stops itself and lets the completion-processing taskqueue wake it up. Since I'm touching the trasnmit taskqueue I've also corrected the name of a counter and also fixed a bug where EINVAL mbufs were not being freed and were instead living forever on the bufring. Signed-off-by: Shailend Chand <shailend@google.com> Reviewed-by: markj MFC-after: 2 weeks Differential Revision: https://reviews.freebsd.org/D47138		2024-11-06 15:06:41 +00:00
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gve_adminq.c
gve_adminq.h
gve_desc.h
gve_dqo.h
gve_main.c
gve_plat.h
gve_qpl.c
gve_register.h
gve_rx_dqo.c
gve_rx.c
gve_sysctl.c
gve_tx_dqo.c
gve_tx.c
gve_utils.c
gve.h