From 765951938e2fe2e30571ef4a7de6a46659ce4c68 Mon Sep 17 00:00:00 2001 From: Prashant Sreedharan Date: Mon, 18 Jul 2016 07:15:22 -0400 Subject: [PATCH] bnxt_en: Workaround Nitro A0 hardware RX bug (part 2). The hardware is unable to drop rx packets not matching the RX filters. To workaround it, we create a special VNIC and configure the hardware to direct all packets not matching the filters to it. We then setup the driver to drop packets received on this VNIC. This patch creates the infrastructure for this VNIC, reserves a completion ring, and rx rings. Only shared completion ring mode is supported. The next 2 patches add a NAPI to handle packets from this VNIC and the setup of the VNIC. Signed-off-by: Prashant Sreedharan Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 17 +++++++++++++++-- .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 12 ++++++++++-- 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index de740125b773..75a8b302c198 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -3433,6 +3433,8 @@ static int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id) ring = 0; else if (vnic->flags & BNXT_VNIC_RFS_FLAG) ring = vnic_id - 1; + else if ((vnic_id == 1) && BNXT_CHIP_TYPE_NITRO_A0(bp)) + ring = bp->rx_nr_rings - 1; grp_idx = bp->rx_ring[ring].bnapi->index; req.vnic_id = cpu_to_le16(vnic->fw_vnic_id); @@ -4365,6 +4367,7 @@ static int bnxt_init_chip(struct bnxt *bp, bool irq_re_init) { struct bnxt_vnic_info *vnic = &bp->vnic_info[0]; int rc = 0; + unsigned int rx_nr_rings = bp->rx_nr_rings; if (irq_re_init) { rc = bnxt_hwrm_stat_ctx_alloc(bp); @@ -4387,8 +4390,11 @@ static int bnxt_init_chip(struct bnxt *bp, bool irq_re_init) goto err_out; } + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) + rx_nr_rings--; + /* default vnic 0 */ - rc = bnxt_hwrm_vnic_alloc(bp, 0, 0, bp->rx_nr_rings); + rc = bnxt_hwrm_vnic_alloc(bp, 0, 0, rx_nr_rings); if (rc) { netdev_err(bp->dev, "hwrm vnic alloc failure rc: %x\n", rc); goto err_out; @@ -6519,7 +6525,10 @@ static void _bnxt_get_max_rings(struct bnxt *bp, int *max_rx, int *max_tx, *max_cp = min_t(int, *max_cp, bp->pf.max_stat_ctxs); max_ring_grps = bp->pf.max_hw_ring_grps; } - + if (BNXT_CHIP_TYPE_NITRO_A0(bp) && BNXT_PF(bp)) { + *max_cp -= 1; + *max_rx -= 2; + } if (bp->flags & BNXT_FLAG_AGG_RINGS) *max_rx >>= 1; *max_rx = min_t(int, *max_rx, max_ring_grps); @@ -6555,6 +6564,10 @@ static int bnxt_set_dflt_rings(struct bnxt *bp) bp->cp_nr_rings = sh ? max_t(int, bp->tx_nr_rings, bp->rx_nr_rings) : bp->tx_nr_rings + bp->rx_nr_rings; bp->num_stat_ctxs = bp->cp_nr_rings; + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) { + bp->rx_nr_rings++; + bp->cp_nr_rings++; + } return rc; } diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c index 0f7dd861ab4d..492c06bc0406 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c @@ -362,9 +362,13 @@ static void bnxt_get_channels(struct net_device *dev, channel->max_other = 0; if (bp->flags & BNXT_FLAG_SHARED_RINGS) { channel->combined_count = bp->rx_nr_rings; + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) + channel->combined_count--; } else { - channel->rx_count = bp->rx_nr_rings; - channel->tx_count = bp->tx_nr_rings_per_tc; + if (!BNXT_CHIP_TYPE_NITRO_A0(bp)) { + channel->rx_count = bp->rx_nr_rings; + channel->tx_count = bp->tx_nr_rings_per_tc; + } } } @@ -387,6 +391,10 @@ static int bnxt_set_channels(struct net_device *dev, (channel->rx_count || channel->tx_count)) return -EINVAL; + if (BNXT_CHIP_TYPE_NITRO_A0(bp) && (channel->rx_count || + channel->tx_count)) + return -EINVAL; + if (channel->combined_count) sh = true; -- 2.39.5