cxgb(4): add an 'nfilters' tunable that lets the user place an upper
limit on the number of hardware filters (and thus the amount of TCAM reserved for filtering).
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3a2c6562f3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=208887
@ -238,6 +238,10 @@ TUNABLE_INT("hw.cxgb.snd_queue_len", &cxgb_snd_queue_len);
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SYSCTL_UINT(_hw_cxgb, OID_AUTO, snd_queue_len, CTLFLAG_RDTUN,
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&cxgb_snd_queue_len, 0, "send queue size ");
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static int nfilters = -1;
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TUNABLE_INT("hw.cxgb.nfilters", &nfilters);
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SYSCTL_INT(_hw_cxgb, OID_AUTO, nfilters, CTLFLAG_RDTUN,
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&nfilters, 0, "max number of entries in the filter table");
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enum {
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MAX_TXQ_ENTRIES = 16384,
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@ -1652,6 +1656,7 @@ static int
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cxgb_up(struct adapter *sc)
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{
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int err = 0;
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unsigned int mxf = t3_mc5_size(&sc->mc5) - MC5_MIN_TIDS;
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KASSERT(sc->open_device_map == 0, ("%s: device(s) already open (%x)",
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__func__, sc->open_device_map));
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@ -1668,11 +1673,13 @@ cxgb_up(struct adapter *sc)
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if ((err = update_tpsram(sc)))
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goto out;
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if (is_offload(sc)) {
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if (is_offload(sc) && nfilters != 0) {
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sc->params.mc5.nservers = 0;
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sc->params.mc5.nroutes = 0;
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sc->params.mc5.nfilters = t3_mc5_size(&sc->mc5) -
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MC5_MIN_TIDS;
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if (nfilters < 0)
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sc->params.mc5.nfilters = mxf;
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else
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sc->params.mc5.nfilters = min(nfilters, mxf);
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}
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err = t3_init_hw(sc, 0);
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