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cxgb(4): add an 'nfilters' tunable that lets the user place an upper

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limit on the number of hardware filters (and thus the amount of TCAM
reserved for filtering).
This commit is contained in:
Navdeep Parhar 2010-06-07 08:23:16 +00:00
parent 24609c49ca
commit 3a2c6562f3
1 changed files with 11 additions and 4 deletions
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15
sys/dev/cxgb/cxgb_main.c
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@ -238,6 +238,10 @@ TUNABLE_INT("hw.cxgb.snd_queue_len", &cxgb_snd_queue_len);
SYSCTL_UINT(_hw_cxgb, OID_AUTO, snd_queue_len, CTLFLAG_RDTUN,
&cxgb_snd_queue_len, 0, "send queue size ");
static int nfilters = -1;
TUNABLE_INT("hw.cxgb.nfilters", &nfilters);
SYSCTL_INT(_hw_cxgb, OID_AUTO, nfilters, CTLFLAG_RDTUN,
&nfilters, 0, "max number of entries in the filter table");
enum {
MAX_TXQ_ENTRIES = 16384,
@ -1652,6 +1656,7 @@ static int
cxgb_up(struct adapter *sc)
{
int err = 0;
unsigned int mxf = t3_mc5_size(&sc->mc5) - MC5_MIN_TIDS;
KASSERT(sc->open_device_map == 0, ("%s: device(s) already open (%x)",
__func__, sc->open_device_map));
@ -1668,11 +1673,13 @@ cxgb_up(struct adapter *sc)
if ((err = update_tpsram(sc)))
goto out;
if (is_offload(sc)) {
if (is_offload(sc) && nfilters != 0) {
sc->params.mc5.nservers = 0;
sc->params.mc5.nroutes = 0;
sc->params.mc5.nfilters = t3_mc5_size(&sc->mc5) -
MC5_MIN_TIDS;
if (nfilters < 0)
sc->params.mc5.nfilters = mxf;
else
sc->params.mc5.nfilters = min(nfilters, mxf);
}
err = t3_init_hw(sc, 0);