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Fix iflib freelist state corruption

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This fixes a bug in iflib freelist management that breaks the required
correspondence between freelist indexes and driver ring slots.

PR:		243126, 243392, 240628
Reported by:	avg, alexandr.oleynikov@gmail.com, Harald Schmalzbauer
Reviewed by:	avg, gallatin
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D23943
This commit is contained in:
Patrick Kelsey 2020-03-14 19:43:44 +00:00
parent 30b5d9be24
commit 9e9b738ac5
1 changed files with 3 additions and 1 deletions
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4
sys/net/iflib.c
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@ -2072,7 +2072,9 @@ _iflib_fl_refill(if_ctx_t ctx, iflib_fl_t fl, int count)
bus_dmamap_sync(fl->ifl_ifdi->idi_tag, fl->ifl_ifdi->idi_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
ctx->isc_rxd_flush(ctx->ifc_softc, fl->ifl_rxq->ifr_id, fl->ifl_id, pidx);
fl->ifl_fragidx = frag_idx;
fl->ifl_fragidx = frag_idx + 1;
if (fl->ifl_fragidx == fl->ifl_size)
fl->ifl_fragidx = 0;
return (n == -1 ? 0 : IFLIB_RXEOF_EMPTY);
}