Author: mav
Date: Mon Jul 13 17:20:20 2020
New Revision: 363163
URL: https://svnweb.freebsd.org/changeset/base/363163
Log:
MFC r358995 (by pkelsey): Fix iflib freelist state corruption
This fixes a bug in iflib freelist management that breaks the required
correspondence between freelist indexes and driver ring slots.
PR: 243126, 243392, 240628
Modified:
stable/12/sys/net/iflib.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/net/iflib.c
==============================================================================
--- stable/12/sys/net/iflib.c Mon Jul 13 17:05:44 2020 (r363162)
+++ stable/12/sys/net/iflib.c Mon Jul 13 17:20:20 2020 (r363163)
@@ -2122,7 +2122,9 @@ _iflib_fl_refill(if_ctx_t ctx, iflib_fl_t fl, int coun
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);
}
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