D28716.1794556780.diff
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D28716.1794556780.diff
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	diff --git a/sys/dev/cxgbe/t4_sge.c b/sys/dev/cxgbe/t4_sge.c
	--- a/sys/dev/cxgbe/t4_sge.c
	+++ b/sys/dev/cxgbe/t4_sge.c
	@@ -4524,8 +4524,9 @@
	caddr_t cl;
	struct rx_buf_info *rxb;
	struct cluster_metadata *clm;
	- uint16_t max_pidx;
	+ uint16_t max_pidx, zidx;
	uint16_t hw_cidx = fl->hw_cidx; /* stable snapshot */
	+ bool lowmem = false;

	FL_LOCK_ASSERT_OWNED(fl);

	@@ -4573,11 +4574,14 @@
	sd->cl = NULL; /* gave up my reference */
	}
	MPASS(sd->cl == NULL);
	- rxb = &sc->sge.rx_buf_info[fl->zidx];
	+ zidx = lowmem ? fl->safe_zidx : fl->zidx;
	+ rxb = &sc->sge.rx_buf_info[zidx];
	cl = uma_zalloc(rxb->zone, M_NOWAIT);
	if (__predict_false(cl == NULL)) {
	- if (fl->zidx != fl->safe_zidx) {
	- rxb = &sc->sge.rx_buf_info[fl->safe_zidx];
	+ if (!lowmem && zidx != fl->safe_zidx) {
	+ lowmem = true;
	+ zidx = fl->safe_zidx;
	+ rxb = &sc->sge.rx_buf_info[zidx];
	cl = uma_zalloc(rxb->zone, M_NOWAIT);
	}
	if (cl == NULL)
	@@ -4588,7 +4592,7 @@

	pa = pmap_kextract((vm_offset_t)cl);
	sd->cl = cl;
	- sd->zidx = fl->zidx;
	+ sd->zidx = zidx;

	if (fl->flags & FL_BUF_PACKING) {
	*d = htobe64(pa \| rxb->hwidx2);