git: 26d79d40a74f - main - Hyper-V: hn: Enter network epoch when required

[tuexen at freebsd.org]

> On 26. Aug 2021, at 19:32, Michael Tuexen <tuexen at freebsd.org> wrote:
> 
> The branch main has been updated by tuexen:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=26d79d40a74fc804c76acd88a1f8f10f9827a2b3
> 
> commit 26d79d40a74fc804c76acd88a1f8f10f9827a2b3
> Author:     Michael Tuexen <tuexen at FreeBSD.org>
> AuthorDate: 2021-08-26 17:27:04 +0000
> Commit:     Michael Tuexen <tuexen at FreeBSD.org>
> CommitDate: 2021-08-26 17:32:00 +0000
> 
>    Hyper-V: hn: Enter network epoch when required
> 
>    PR:                             254695
Missing:
Reviewed by:                  hselasky, gallatin
Tested by:                    gbe
MFC after:                    1 week
Sponsored by:                 Netflix, Inc.
Differential Revision:        https://reviews.freebsd.org/D31679
> ---
> sys/dev/hyperv/netvsc/if_hn.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
> 
> diff --git a/sys/dev/hyperv/netvsc/if_hn.c b/sys/dev/hyperv/netvsc/if_hn.c
> index cd0b5a5fa8b9..0ec398bed670 100644
> --- a/sys/dev/hyperv/netvsc/if_hn.c
> +++ b/sys/dev/hyperv/netvsc/if_hn.c
> @@ -83,6 +83,7 @@ __FBSDID("$FreeBSD$");
> #include <sys/taskqueue.h>
> #include <sys/buf_ring.h>
> #include <sys/eventhandler.h>
> +#include <sys/epoch.h>
> 
> #include <machine/atomic.h>
> #include <machine/in_cksum.h>
> @@ -2883,7 +2884,11 @@ static void
> hn_chan_rollup(struct hn_rx_ring *rxr, struct hn_tx_ring *txr)
> {
> #if defined(INET) || defined(INET6)
> +	struct epoch_tracker et;
> +
> +	NET_EPOCH_ENTER(et);
> 	tcp_lro_flush_all(&rxr->hn_lro);
> +	NET_EPOCH_EXIT(et);
> #endif
> 
> 	/*
> @@ -7459,6 +7464,7 @@ static void
> hn_nvs_handle_rxbuf(struct hn_rx_ring *rxr, struct vmbus_channel *chan,
>     const struct vmbus_chanpkt_hdr *pkthdr)
> {
> +	struct epoch_tracker et;
> 	const struct vmbus_chanpkt_rxbuf *pkt;
> 	const struct hn_nvs_hdr *nvs_hdr;
> 	int count, i, hlen;
> @@ -7496,6 +7502,7 @@ hn_nvs_handle_rxbuf(struct hn_rx_ring *rxr, struct vmbus_channel *chan,
> 		return;
> 	}
> 
> +	NET_EPOCH_ENTER(et);
> 	/* Each range represents 1 RNDIS pkt that contains 1 Ethernet frame */
> 	for (i = 0; i < count; ++i) {
> 		int ofs, len;
> @@ -7511,6 +7518,7 @@ hn_nvs_handle_rxbuf(struct hn_rx_ring *rxr, struct vmbus_channel *chan,
> 		rxr->rsc.is_last = (i == (count - 1));
> 		hn_rndis_rxpkt(rxr, rxr->hn_rxbuf + ofs, len);
> 	}
> +	NET_EPOCH_EXIT(et);
> 
> 	/*
> 	 * Ack the consumed RXBUF associated w/ this channel packet,