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Date: Tue, 12 Jul 2016 00:51:31 -0700
From: Brenden Blanco <bblanco@...mgrid.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: Brenden Blanco <bblanco@...mgrid.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Saeed Mahameed <saeedm@....mellanox.co.il>,
Martin KaFai Lau <kafai@...com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Ari Saha <as754m@....com>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
Or Gerlitz <gerlitz.or@...il.com>, john.fastabend@...il.com,
hannes@...essinduktion.org, Thomas Graf <tgraf@...g.ch>,
Tom Herbert <tom@...bertland.com>,
Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH v8 08/11] net/mlx4_en: break out tx_desc write into separate function
In preparation for writing the tx descriptor from multiple functions,
create a helper for both normal and blueflame access.
Signed-off-by: Brenden Blanco <bblanco@...mgrid.com>
---
drivers/infiniband/hw/mlx4/qp.c | 11 +--
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 127 +++++++++++++++++------------
include/linux/mlx4/qp.h | 18 ++--
3 files changed, 90 insertions(+), 66 deletions(-)
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 8db8405..768085f 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -232,7 +232,7 @@ static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size)
}
} else {
ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
- s = (ctrl->fence_size & 0x3f) << 4;
+ s = (ctrl->qpn_vlan.fence_size & 0x3f) << 4;
for (i = 64; i < s; i += 64) {
wqe = buf + i;
*wqe = cpu_to_be32(0xffffffff);
@@ -264,7 +264,7 @@ static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size)
inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl));
}
ctrl->srcrb_flags = 0;
- ctrl->fence_size = size / 16;
+ ctrl->qpn_vlan.fence_size = size / 16;
/*
* Make sure descriptor is fully written before setting ownership bit
* (because HW can start executing as soon as we do).
@@ -1992,7 +1992,8 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
ctrl = get_send_wqe(qp, i);
ctrl->owner_opcode = cpu_to_be32(1 << 31);
if (qp->sq_max_wqes_per_wr == 1)
- ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
+ ctrl->qpn_vlan.fence_size =
+ 1 << (qp->sq.wqe_shift - 4);
stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
}
@@ -3169,8 +3170,8 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
wmb();
*lso_wqe = lso_hdr_sz;
- ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
- MLX4_WQE_CTRL_FENCE : 0) | size;
+ ctrl->qpn_vlan.fence_size = (wr->send_flags & IB_SEND_FENCE ?
+ MLX4_WQE_CTRL_FENCE : 0) | size;
/*
* Make sure descriptor is fully written before
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 76aa4d2..c29191e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -700,10 +700,66 @@ static void mlx4_bf_copy(void __iomem *dst, const void *src,
__iowrite64_copy(dst, src, bytecnt / 8);
}
+void mlx4_en_xmit_doorbell(struct mlx4_en_tx_ring *ring)
+{
+ wmb();
+ /* Since there is no iowrite*_native() that writes the
+ * value as is, without byteswapping - using the one
+ * the doesn't do byteswapping in the relevant arch
+ * endianness.
+ */
+#if defined(__LITTLE_ENDIAN)
+ iowrite32(
+#else
+ iowrite32be(
+#endif
+ ring->doorbell_qpn,
+ ring->bf.uar->map + MLX4_SEND_DOORBELL);
+}
+
+static void mlx4_en_tx_write_desc(struct mlx4_en_tx_ring *ring,
+ struct mlx4_en_tx_desc *tx_desc,
+ union mlx4_wqe_qpn_vlan qpn_vlan,
+ int desc_size, int bf_index,
+ __be32 op_own, bool bf_ok,
+ bool send_doorbell)
+{
+ tx_desc->ctrl.qpn_vlan = qpn_vlan;
+
+ if (bf_ok) {
+ op_own |= htonl((bf_index & 0xffff) << 8);
+ /* Ensure new descriptor hits memory
+ * before setting ownership of this descriptor to HW
+ */
+ dma_wmb();
+ tx_desc->ctrl.owner_opcode = op_own;
+
+ wmb();
+
+ mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl,
+ desc_size);
+
+ wmb();
+
+ ring->bf.offset ^= ring->bf.buf_size;
+ } else {
+ /* Ensure new descriptor hits memory
+ * before setting ownership of this descriptor to HW
+ */
+ dma_wmb();
+ tx_desc->ctrl.owner_opcode = op_own;
+ if (send_doorbell)
+ mlx4_en_xmit_doorbell(ring);
+ else
+ ring->xmit_more++;
+ }
+}
+
netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct skb_shared_info *shinfo = skb_shinfo(skb);
struct mlx4_en_priv *priv = netdev_priv(dev);
+ union mlx4_wqe_qpn_vlan qpn_vlan = {};
struct device *ddev = priv->ddev;
struct mlx4_en_tx_ring *ring;
struct mlx4_en_tx_desc *tx_desc;
@@ -725,6 +781,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
bool stop_queue;
bool inline_ok;
u32 ring_cons;
+ bool bf_ok;
tx_ind = skb_get_queue_mapping(skb);
ring = priv->tx_ring[tx_ind];
@@ -749,9 +806,17 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_drop;
}
+ bf_ok = ring->bf_enabled;
if (skb_vlan_tag_present(skb)) {
- vlan_tag = skb_vlan_tag_get(skb);
+ qpn_vlan.vlan_tag = skb_vlan_tag_get(skb);
vlan_proto = be16_to_cpu(skb->vlan_proto);
+ if (vlan_proto == ETH_P_8021AD)
+ qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;
+ else if (vlan_proto == ETH_P_8021Q)
+ qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN;
+ else
+ qpn_vlan.ins_vlan = 0;
+ bf_ok = false;
}
netdev_txq_bql_enqueue_prefetchw(ring->tx_queue);
@@ -771,6 +836,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
else {
tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
bounce = true;
+ bf_ok = false;
}
/* Save skb in tx_info ring */
@@ -946,60 +1012,15 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
real_size = (real_size / 16) & 0x3f;
- if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
- !skb_vlan_tag_present(skb) && send_doorbell) {
- tx_desc->ctrl.bf_qpn = ring->doorbell_qpn |
- cpu_to_be32(real_size);
-
- op_own |= htonl((bf_index & 0xffff) << 8);
- /* Ensure new descriptor hits memory
- * before setting ownership of this descriptor to HW
- */
- dma_wmb();
- tx_desc->ctrl.owner_opcode = op_own;
-
- wmb();
-
- mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl,
- desc_size);
-
- wmb();
-
- ring->bf.offset ^= ring->bf.buf_size;
- } else {
- tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag);
- if (vlan_proto == ETH_P_8021AD)
- tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;
- else if (vlan_proto == ETH_P_8021Q)
- tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN;
- else
- tx_desc->ctrl.ins_vlan = 0;
+ bf_ok &= desc_size <= MAX_BF && send_doorbell;
- tx_desc->ctrl.fence_size = real_size;
+ if (bf_ok)
+ qpn_vlan.bf_qpn = ring->doorbell_qpn | cpu_to_be32(real_size);
+ else
+ qpn_vlan.fence_size = real_size;
- /* Ensure new descriptor hits memory
- * before setting ownership of this descriptor to HW
- */
- dma_wmb();
- tx_desc->ctrl.owner_opcode = op_own;
- if (send_doorbell) {
- wmb();
- /* Since there is no iowrite*_native() that writes the
- * value as is, without byteswapping - using the one
- * the doesn't do byteswapping in the relevant arch
- * endianness.
- */
-#if defined(__LITTLE_ENDIAN)
- iowrite32(
-#else
- iowrite32be(
-#endif
- ring->doorbell_qpn,
- ring->bf.uar->map + MLX4_SEND_DOORBELL);
- } else {
- ring->xmit_more++;
- }
- }
+ mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, desc_size, bf_index,
+ op_own, bf_ok, send_doorbell);
if (unlikely(stop_queue)) {
/* If queue was emptied after the if (stop_queue) , and before
diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index 587cdf9..deaa221 100644
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -291,16 +291,18 @@ enum {
MLX4_WQE_CTRL_FORCE_LOOPBACK = 1 << 0,
};
+union mlx4_wqe_qpn_vlan {
+ struct {
+ __be16 vlan_tag;
+ u8 ins_vlan;
+ u8 fence_size;
+ };
+ __be32 bf_qpn;
+};
+
struct mlx4_wqe_ctrl_seg {
__be32 owner_opcode;
- union {
- struct {
- __be16 vlan_tag;
- u8 ins_vlan;
- u8 fence_size;
- };
- __be32 bf_qpn;
- };
+ union mlx4_wqe_qpn_vlan qpn_vlan;
/*
* High 24 bits are SRC remote buffer; low 8 bits are flags:
* [7] SO (strong ordering)
--
2.8.2
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