diff options
Diffstat (limited to 'drivers/net/ethernet/intel/igc/igc_tsn.c')
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc_tsn.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c index 2935d57c593d..0fce22de2ab8 100644 --- a/drivers/net/ethernet/intel/igc/igc_tsn.c +++ b/drivers/net/ethernet/intel/igc/igc_tsn.c @@ -18,6 +18,20 @@ static bool is_any_launchtime(struct igc_adapter *adapter) return false; } +static bool is_cbs_enabled(struct igc_adapter *adapter) +{ + int i; + + for (i = 0; i < adapter->num_tx_queues; i++) { + struct igc_ring *ring = adapter->tx_ring[i]; + + if (ring->cbs_enable) + return true; + } + + return false; +} + static unsigned int igc_tsn_new_flags(struct igc_adapter *adapter) { unsigned int new_flags = adapter->flags & ~IGC_FLAG_TSN_ANY_ENABLED; @@ -28,6 +42,9 @@ static unsigned int igc_tsn_new_flags(struct igc_adapter *adapter) if (is_any_launchtime(adapter)) new_flags |= IGC_FLAG_TSN_QBV_ENABLED; + if (is_cbs_enabled(adapter)) + new_flags |= IGC_FLAG_TSN_QAV_ENABLED; + return new_flags; } @@ -87,6 +104,8 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter) for (i = 0; i < adapter->num_tx_queues; i++) { struct igc_ring *ring = adapter->tx_ring[i]; u32 txqctl = 0; + u16 cbs_value; + u32 tqavcc; wr32(IGC_STQT(i), ring->start_time); wr32(IGC_ENDQT(i), ring->end_time); @@ -104,6 +123,90 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter) if (ring->launchtime_enable) txqctl |= IGC_TXQCTL_QUEUE_MODE_LAUNCHT; + /* Skip configuring CBS for Q2 and Q3 */ + if (i > 1) + goto skip_cbs; + + if (ring->cbs_enable) { + if (i == 0) + txqctl |= IGC_TXQCTL_QAV_SEL_CBS0; + else + txqctl |= IGC_TXQCTL_QAV_SEL_CBS1; + + /* According to i225 datasheet section 7.5.2.7, we + * should set the 'idleSlope' field from TQAVCC + * register following the equation: + * + * value = link-speed 0x7736 * BW * 0.2 + * ---------- * ----------------- (E1) + * 100Mbps 2.5 + * + * Note that 'link-speed' is in Mbps. + * + * 'BW' is the percentage bandwidth out of full + * link speed which can be found with the + * following equation. Note that idleSlope here + * is the parameter from this function + * which is in kbps. + * + * BW = idleSlope + * ----------------- (E2) + * link-speed * 1000 + * + * That said, we can come up with a generic + * equation to calculate the value we should set + * it TQAVCC register by replacing 'BW' in E1 by E2. + * The resulting equation is: + * + * value = link-speed * 0x7736 * idleSlope * 0.2 + * ------------------------------------- (E3) + * 100 * 2.5 * link-speed * 1000 + * + * 'link-speed' is present in both sides of the + * fraction so it is canceled out. The final + * equation is the following: + * + * value = idleSlope * 61036 + * ----------------- (E4) + * 2500000 + * + * NOTE: For i225, given the above, we can see + * that idleslope is represented in + * 40.959433 kbps units by the value at + * the TQAVCC register (2.5Gbps / 61036), + * which reduces the granularity for + * idleslope increments. + * + * In i225 controller, the sendSlope and loCredit + * parameters from CBS are not configurable + * by software so we don't do any + * 'controller configuration' in respect to + * these parameters. + */ + cbs_value = DIV_ROUND_UP_ULL(ring->idleslope + * 61036ULL, 2500000); + + tqavcc = rd32(IGC_TQAVCC(i)); + tqavcc &= ~IGC_TQAVCC_IDLESLOPE_MASK; + tqavcc |= cbs_value | IGC_TQAVCC_KEEP_CREDITS; + wr32(IGC_TQAVCC(i), tqavcc); + + wr32(IGC_TQAVHC(i), + 0x80000000 + ring->hicredit * 0x7735); + } else { + /* Disable any CBS for the queue */ + txqctl &= ~(IGC_TXQCTL_QAV_SEL_MASK); + + /* Set idleSlope to zero. */ + tqavcc = rd32(IGC_TQAVCC(i)); + tqavcc &= ~(IGC_TQAVCC_IDLESLOPE_MASK | + IGC_TQAVCC_KEEP_CREDITS); + wr32(IGC_TQAVCC(i), tqavcc); + + /* Set hiCredit to zero. */ + wr32(IGC_TQAVHC(i), 0); + } +skip_cbs: wr32(IGC_TXQCTL(i), txqctl); } |