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cxgb4: Make sure that Freelist size is larger than Egress Congestion Threshold
We need to make sure that the Free List Size, in pointers, is at least 2 Egress Queue Units (8 pointers/each) larger than the SGE's Egress Congestion Threshold (in pointers). Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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6decd63aca
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1343299727
2 changed files with 14 additions and 1 deletions
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@ -2473,6 +2473,15 @@ int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq,
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c.iqaddr = cpu_to_be64(iq->phys_addr);
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if (fl) {
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/* Allocate the ring for the hardware free list (with space
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* for its status page) along with the associated software
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* descriptor ring. The free list size needs to be a multiple
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* of the Egress Queue Unit and at least 2 Egress Units larger
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* than the SGE's Egress Congrestion Threshold
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* (fl_starve_thres - 1).
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*/
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if (fl->size < s->fl_starve_thres - 1 + 2 * 8)
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fl->size = s->fl_starve_thres - 1 + 2 * 8;
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fl->size = roundup(fl->size, 8);
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fl->desc = alloc_ring(adap->pdev_dev, fl->size, sizeof(__be64),
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sizeof(struct rx_sw_desc), &fl->addr,
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@ -2243,8 +2243,12 @@ int t4vf_sge_alloc_rxq(struct adapter *adapter, struct sge_rspq *rspq,
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* Allocate the ring for the hardware free list (with space
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* for its status page) along with the associated software
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* descriptor ring. The free list size needs to be a multiple
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* of the Egress Queue Unit.
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* of the Egress Queue Unit and at least 2 Egress Units larger
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* than the SGE's Egress Congrestion Threshold
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* (fl_starve_thres - 1).
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*/
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if (fl->size < s->fl_starve_thres - 1 + 2 * FL_PER_EQ_UNIT)
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fl->size = s->fl_starve_thres - 1 + 2 * FL_PER_EQ_UNIT;
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fl->size = roundup(fl->size, FL_PER_EQ_UNIT);
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fl->desc = alloc_ring(adapter->pdev_dev, fl->size,
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sizeof(__be64), sizeof(struct rx_sw_desc),
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