From 10bbdaf5e4879fd7fc51f25c84d7b10de16cbe0e Mon Sep 17 00:00:00 2001 From: Prashant Sreedharan Date: Mon, 18 Jul 2016 07:15:23 -0400 Subject: [PATCH] bnxt_en: Workaround Nitro A0 hardware RX bug (part 3). Allocate napi for special vnic, packets arriving on this napi will simply be dropped and the buffers will be replenished back to the HW. Signed-off-by: Prashant Sreedharan Signed-off-by: Vasundhara Volam Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 81 ++++++++++++++++++++++- 1 file changed, 80 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 75a8b302c198..f0aa582de2be 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -1668,6 +1668,76 @@ static int bnxt_poll_work(struct bnxt *bp, struct bnxt_napi *bnapi, int budget) return rx_pkts; } +static int bnxt_poll_nitroa0(struct napi_struct *napi, int budget) +{ + struct bnxt_napi *bnapi = container_of(napi, struct bnxt_napi, napi); + struct bnxt *bp = bnapi->bp; + struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring; + struct bnxt_rx_ring_info *rxr = bnapi->rx_ring; + struct tx_cmp *txcmp; + struct rx_cmp_ext *rxcmp1; + u32 cp_cons, tmp_raw_cons; + u32 raw_cons = cpr->cp_raw_cons; + u32 rx_pkts = 0; + bool agg_event = false; + + while (1) { + int rc; + + cp_cons = RING_CMP(raw_cons); + txcmp = &cpr->cp_desc_ring[CP_RING(cp_cons)][CP_IDX(cp_cons)]; + + if (!TX_CMP_VALID(txcmp, raw_cons)) + break; + + if ((TX_CMP_TYPE(txcmp) & 0x30) == 0x10) { + tmp_raw_cons = NEXT_RAW_CMP(raw_cons); + cp_cons = RING_CMP(tmp_raw_cons); + rxcmp1 = (struct rx_cmp_ext *) + &cpr->cp_desc_ring[CP_RING(cp_cons)][CP_IDX(cp_cons)]; + + if (!RX_CMP_VALID(rxcmp1, tmp_raw_cons)) + break; + + /* force an error to recycle the buffer */ + rxcmp1->rx_cmp_cfa_code_errors_v2 |= + cpu_to_le32(RX_CMPL_ERRORS_CRC_ERROR); + + rc = bnxt_rx_pkt(bp, bnapi, &raw_cons, &agg_event); + if (likely(rc == -EIO)) + rx_pkts++; + else if (rc == -EBUSY) /* partial completion */ + break; + } else if (unlikely(TX_CMP_TYPE(txcmp) == + CMPL_BASE_TYPE_HWRM_DONE)) { + bnxt_hwrm_handler(bp, txcmp); + } else { + netdev_err(bp->dev, + "Invalid completion received on special ring\n"); + } + raw_cons = NEXT_RAW_CMP(raw_cons); + + if (rx_pkts == budget) + break; + } + + cpr->cp_raw_cons = raw_cons; + BNXT_CP_DB(cpr->cp_doorbell, cpr->cp_raw_cons); + writel(DB_KEY_RX | rxr->rx_prod, rxr->rx_doorbell); + writel(DB_KEY_RX | rxr->rx_prod, rxr->rx_doorbell); + + if (agg_event) { + writel(DB_KEY_RX | rxr->rx_agg_prod, rxr->rx_agg_doorbell); + writel(DB_KEY_RX | rxr->rx_agg_prod, rxr->rx_agg_doorbell); + } + + if (!bnxt_has_work(bp, cpr) && rx_pkts < budget) { + napi_complete(napi); + BNXT_CP_DB_REARM(cpr->cp_doorbell, cpr->cp_raw_cons); + } + return rx_pkts; +} + static int bnxt_poll(struct napi_struct *napi, int budget) { struct bnxt_napi *bnapi = container_of(napi, struct bnxt_napi, napi); @@ -4758,14 +4828,23 @@ static void bnxt_del_napi(struct bnxt *bp) static void bnxt_init_napi(struct bnxt *bp) { int i; + unsigned int cp_nr_rings = bp->cp_nr_rings; struct bnxt_napi *bnapi; if (bp->flags & BNXT_FLAG_USING_MSIX) { - for (i = 0; i < bp->cp_nr_rings; i++) { + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) + cp_nr_rings--; + for (i = 0; i < cp_nr_rings; i++) { bnapi = bp->bnapi[i]; netif_napi_add(bp->dev, &bnapi->napi, bnxt_poll, 64); } + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) { + bnapi = bp->bnapi[cp_nr_rings]; + netif_napi_add(bp->dev, &bnapi->napi, + bnxt_poll_nitroa0, 64); + napi_hash_add(&bnapi->napi); + } } else { bnapi = bp->bnapi[0]; netif_napi_add(bp->dev, &bnapi->napi, bnxt_poll, 64); -- 2.20.1