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Merge branch 'mlx4-XDP-performance-improvements'

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Tariq Toukan says:

====================
mlx4 XDP performance improvements

This patchset contains data-path improvements, mainly for XDP_DROP
and XDP_TX cases.

Main patches:
* Patch 2 by Saeed allows enabling optimized A0 RX steering (in HW) when
  setting a single RX ring.
  With this configuration, HW packet-rate dramatically improves,
  reaching 28.1 Mpps in XDP_DROP case for both IPv4 (37% gain)
  and IPv6 (53% gain).
* Patch 6 enhances the XDP xmit function. Among other changes, now we
  ring one doorbell per NAPI. Patch gives 17% gain in XDP_TX case.
* Patch 7 obsoletes the NAPI of XDP_TX completion queue and integrates its
  poll into the respective RX NAPI. Patch gives 15% gain in XDP_TX case.

Series generated against net-next commit:
f7aec129a3 rxrpc: Cache the congestion window setting
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-06-15 22:53:24 -04:00
commit 117b07e64b
7 changed files with 294 additions and 236 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/net/ethernet/mellanox/mlx4/en_cq.c
View File

@ -146,16 +146,25 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
if (err)
goto free_eq;
cq->mcq.comp = cq->type != RX ? mlx4_en_tx_irq : mlx4_en_rx_irq;
cq->mcq.event = mlx4_en_cq_event;
if (cq->type != RX)
switch (cq->type) {
case TX:
cq->mcq.comp = mlx4_en_tx_irq;
netif_tx_napi_add(cq->dev, &cq->napi, mlx4_en_poll_tx_cq,
NAPI_POLL_WEIGHT);
else
napi_enable(&cq->napi);
break;
case RX:
cq->mcq.comp = mlx4_en_rx_irq;
netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
napi_enable(&cq->napi);
napi_enable(&cq->napi);
break;
case TX_XDP:
/* nothing regarding napi, it's shared with rx ring */
cq->xdp_busy = false;
break;
}
return 0;
@ -184,8 +193,10 @@ void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
{
napi_disable(&cq->napi);
netif_napi_del(&cq->napi);
if (cq->type != TX_XDP) {
napi_disable(&cq->napi);
netif_napi_del(&cq->napi);
}
mlx4_cq_free(priv->mdev->dev, &cq->mcq);
}

6
drivers/net/ethernet/mellanox/mlx4/en_main.c
View File

@ -125,9 +125,9 @@ void mlx4_en_update_loopback_state(struct net_device *dev,
priv->flags |= MLX4_EN_FLAG_ENABLE_HW_LOOPBACK;
mutex_lock(&priv->mdev->state_lock);
if (priv->mdev->dev->caps.flags2 &
MLX4_DEV_CAP_FLAG2_UPDATE_QP_SRC_CHECK_LB &&
priv->rss_map.indir_qp.qpn) {
if ((priv->mdev->dev->caps.flags2 &
MLX4_DEV_CAP_FLAG2_UPDATE_QP_SRC_CHECK_LB) &&
priv->rss_map.indir_qp && priv->rss_map.indir_qp->qpn) {
int i;
int err = 0;
int loopback = !!(features & NETIF_F_LOOPBACK);

20
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View File

@ -596,6 +596,8 @@ static int mlx4_en_get_qp(struct mlx4_en_priv *priv)
return err;
}
en_info(priv, "Steering Mode %d\n", dev->caps.steering_mode);
if (dev->caps.steering_mode == MLX4_STEERING_MODE_A0) {
int base_qpn = mlx4_get_base_qpn(dev, priv->port);
*qpn = base_qpn + index;
@ -1010,7 +1012,7 @@ static void mlx4_en_do_multicast(struct mlx4_en_priv *priv,
memcpy(&mc_list[10], mclist->addr, ETH_ALEN);
mc_list[5] = priv->port;
err = mlx4_multicast_detach(mdev->dev,
&priv->rss_map.indir_qp,
priv->rss_map.indir_qp,
mc_list,
MLX4_PROT_ETH,
mclist->reg_id);
@ -1032,7 +1034,7 @@ static void mlx4_en_do_multicast(struct mlx4_en_priv *priv,
/* needed for B0 steering support */
mc_list[5] = priv->port;
err = mlx4_multicast_attach(mdev->dev,
&priv->rss_map.indir_qp,
priv->rss_map.indir_qp,
mc_list,
priv->port, 0,
MLX4_PROT_ETH,
@ -1677,13 +1679,15 @@ int mlx4_en_start_port(struct net_device *dev)
if (t != TX_XDP) {
tx_ring->tx_queue = netdev_get_tx_queue(dev, i);
tx_ring->recycle_ring = NULL;
/* Arm CQ for TX completions */
mlx4_en_arm_cq(priv, cq);
} else {
mlx4_en_init_recycle_ring(priv, i);
/* XDP TX CQ should never be armed */
}
/* Arm CQ for TX completions */
mlx4_en_arm_cq(priv, cq);
/* Set initial ownership of all Tx TXBBs to SW (1) */
for (j = 0; j < tx_ring->buf_size; j += STAMP_STRIDE)
*((u32 *)(tx_ring->buf + j)) = 0xffffffff;
@ -1742,7 +1746,7 @@ int mlx4_en_start_port(struct net_device *dev)
/* Attach rx QP to bradcast address */
eth_broadcast_addr(&mc_list[10]);
mc_list[5] = priv->port; /* needed for B0 steering support */
if (mlx4_multicast_attach(mdev->dev, &priv->rss_map.indir_qp, mc_list,
if (mlx4_multicast_attach(mdev->dev, priv->rss_map.indir_qp, mc_list,
priv->port, 0, MLX4_PROT_ETH,
&priv->broadcast_id))
mlx4_warn(mdev, "Failed Attaching Broadcast\n");
@ -1866,12 +1870,12 @@ void mlx4_en_stop_port(struct net_device *dev, int detach)
/* Detach All multicasts */
eth_broadcast_addr(&mc_list[10]);
mc_list[5] = priv->port; /* needed for B0 steering support */
mlx4_multicast_detach(mdev->dev, &priv->rss_map.indir_qp, mc_list,
mlx4_multicast_detach(mdev->dev, priv->rss_map.indir_qp, mc_list,
MLX4_PROT_ETH, priv->broadcast_id);
list_for_each_entry(mclist, &priv->curr_list, list) {
memcpy(&mc_list[10], mclist->addr, ETH_ALEN);
mc_list[5] = priv->port;
mlx4_multicast_detach(mdev->dev, &priv->rss_map.indir_qp,
mlx4_multicast_detach(mdev->dev, priv->rss_map.indir_qp,
mc_list, MLX4_PROT_ETH, mclist->reg_id);
if (mclist->tunnel_reg_id)
mlx4_flow_detach(mdev->dev, mclist->tunnel_reg_id);

147
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@ -134,10 +134,11 @@ static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_rx_ring *ring, int index,
gfp_t gfp)
{
struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
struct mlx4_en_rx_desc *rx_desc = ring->buf +
(index << ring->log_stride);
struct mlx4_en_rx_alloc *frags = ring->rx_info +
(index << priv->log_rx_info);
if (ring->page_cache.index > 0) {
if (likely(ring->page_cache.index > 0)) {
/* XDP uses a single page per frame */
if (!frags->page) {
ring->page_cache.index--;
@ -178,6 +179,7 @@ static void mlx4_en_free_rx_desc(const struct mlx4_en_priv *priv,
}
}
/* Function not in fast-path */
static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
{
struct mlx4_en_rx_ring *ring;
@ -539,14 +541,14 @@ static void validate_loopback(struct mlx4_en_priv *priv, void *va)
priv->loopback_ok = 1;
}
static bool mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
struct mlx4_en_rx_ring *ring)
{
u32 missing = ring->actual_size - (ring->prod - ring->cons);
/* Try to batch allocations, but not too much. */
if (missing < 8)
return false;
return;
do {
if (mlx4_en_prepare_rx_desc(priv, ring,
ring->prod & ring->size_mask,
@ -554,9 +556,9 @@ static bool mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
__GFP_MEMALLOC))
break;
ring->prod++;
} while (--missing);
} while (likely(--missing));
return true;
mlx4_en_update_rx_prod_db(ring);
}
/* When hardware doesn't strip the vlan, we need to calculate the checksum
@ -637,21 +639,14 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_dev *mdev = priv->mdev;
struct mlx4_cqe *cqe;
struct mlx4_en_rx_ring *ring = priv->rx_ring[cq->ring];
struct mlx4_en_rx_alloc *frags;
struct bpf_prog *xdp_prog;
int doorbell_pending;
struct sk_buff *skb;
int index;
int nr;
unsigned int length;
int polled = 0;
int ip_summed;
int factor = priv->cqe_factor;
u64 timestamp;
bool l2_tunnel;
struct mlx4_en_rx_ring *ring;
struct bpf_prog *xdp_prog;
int cq_ring = cq->ring;
bool doorbell_pending;
struct mlx4_cqe *cqe;
int polled = 0;
int index;
if (unlikely(!priv->port_up))
return 0;
@ -659,6 +654,8 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
if (unlikely(budget <= 0))
return polled;
ring = priv->rx_ring[cq_ring];
/* Protect accesses to: ring->xdp_prog, priv->mac_hash list */
rcu_read_lock();
xdp_prog = rcu_dereference(ring->xdp_prog);
@ -673,10 +670,17 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
/* Process all completed CQEs */
while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
cq->mcq.cons_index & cq->size)) {
struct mlx4_en_rx_alloc *frags;
enum pkt_hash_types hash_type;
struct sk_buff *skb;
unsigned int length;
int ip_summed;
void *va;
int nr;
frags = ring->rx_info + (index << priv->log_rx_info);
va = page_address(frags[0].page) + frags[0].page_offset;
prefetchw(va);
/*
* make sure we read the CQE after we read the ownership bit
*/
@ -768,7 +772,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
break;
case XDP_TX:
if (likely(!mlx4_en_xmit_frame(ring, frags, dev,
length, cq->ring,
length, cq_ring,
&doorbell_pending))) {
frags[0].page = NULL;
goto next;
@ -790,24 +794,27 @@ xdp_drop_no_cnt:
ring->packets++;
skb = napi_get_frags(&cq->napi);
if (!skb)
if (unlikely(!skb))
goto next;
if (unlikely(ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL)) {
timestamp = mlx4_en_get_cqe_ts(cqe);
mlx4_en_fill_hwtstamps(mdev, skb_hwtstamps(skb),
u64 timestamp = mlx4_en_get_cqe_ts(cqe);
mlx4_en_fill_hwtstamps(priv->mdev, skb_hwtstamps(skb),
timestamp);
}
skb_record_rx_queue(skb, cq->ring);
skb_record_rx_queue(skb, cq_ring);
if (likely(dev->features & NETIF_F_RXCSUM)) {
if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
MLX4_CQE_STATUS_UDP)) {
if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
cqe->checksum == cpu_to_be16(0xffff)) {
ip_summed = CHECKSUM_UNNECESSARY;
l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
bool l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
(cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
ip_summed = CHECKSUM_UNNECESSARY;
hash_type = PKT_HASH_TYPE_L4;
if (l2_tunnel)
skb->csum_level = 1;
ring->csum_ok++;
@ -822,6 +829,7 @@ xdp_drop_no_cnt:
goto csum_none;
} else {
ip_summed = CHECKSUM_COMPLETE;
hash_type = PKT_HASH_TYPE_L3;
ring->csum_complete++;
}
} else {
@ -831,16 +839,14 @@ xdp_drop_no_cnt:
} else {
csum_none:
ip_summed = CHECKSUM_NONE;
hash_type = PKT_HASH_TYPE_L3;
ring->csum_none++;
}
skb->ip_summed = ip_summed;
if (dev->features & NETIF_F_RXHASH)
skb_set_hash(skb,
be32_to_cpu(cqe->immed_rss_invalid),
(ip_summed == CHECKSUM_UNNECESSARY) ?
PKT_HASH_TYPE_L4 :
PKT_HASH_TYPE_L3);
hash_type);
if ((cqe->vlan_my_qpn &
cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK)) &&
@ -867,15 +873,17 @@ next:
++cq->mcq.cons_index;
index = (cq->mcq.cons_index) & ring->size_mask;
cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
if (++polled == budget)
if (unlikely(++polled == budget))
break;
}
rcu_read_unlock();
if (polled) {
if (doorbell_pending)
mlx4_en_xmit_doorbell(priv->tx_ring[TX_XDP][cq->ring]);
if (likely(polled)) {
if (doorbell_pending) {
priv->tx_cq[TX_XDP][cq_ring]->xdp_busy = true;
mlx4_en_xmit_doorbell(priv->tx_ring[TX_XDP][cq_ring]);
}
mlx4_cq_set_ci(&cq->mcq);
wmb(); /* ensure HW sees CQ consumer before we post new buffers */
@ -883,8 +891,7 @@ next:
}
AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
if (mlx4_en_refill_rx_buffers(priv, ring))
mlx4_en_update_rx_prod_db(ring);
mlx4_en_refill_rx_buffers(priv, ring);
return polled;
}
@ -907,16 +914,30 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
struct net_device *dev = cq->dev;
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_cq *xdp_tx_cq = NULL;
bool clean_complete = true;
int done;
if (priv->tx_ring_num[TX_XDP]) {
xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring];
if (xdp_tx_cq->xdp_busy) {
clean_complete = mlx4_en_process_tx_cq(dev, xdp_tx_cq,
budget);
xdp_tx_cq->xdp_busy = !clean_complete;
}
}
done = mlx4_en_process_rx_cq(dev, cq, budget);
/* If we used up all the quota - we're probably not done yet... */
if (done == budget) {
if (done == budget || !clean_complete) {
const struct cpumask *aff;
struct irq_data *idata;
int cpu_curr;
/* in case we got here because of !clean_complete */
done = budget;
INC_PERF_COUNTER(priv->pstats.napi_quota);
cpu_curr = smp_processor_id();
@ -936,7 +957,7 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
done--;
}
/* Done for now */
if (napi_complete_done(napi, done))
if (likely(napi_complete_done(napi, done)))
mlx4_en_arm_cq(priv, cq);
return done;
}
@ -1099,11 +1120,14 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
int i, qpn;
int err = 0;
int good_qps = 0;
u8 flags;
en_dbg(DRV, priv, "Configuring rss steering\n");
flags = priv->rx_ring_num == 1 ? MLX4_RESERVE_A0_QP : 0;
err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
priv->rx_ring_num,
&rss_map->base_qpn, 0);
&rss_map->base_qpn, flags);
if (err) {
en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
return err;
@ -1120,13 +1144,28 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
++good_qps;
}
if (priv->rx_ring_num == 1) {
rss_map->indir_qp = &rss_map->qps[0];
priv->base_qpn = rss_map->indir_qp->qpn;
en_info(priv, "Optimized Non-RSS steering\n");
return 0;
}
rss_map->indir_qp = kzalloc(sizeof(*rss_map->indir_qp), GFP_KERNEL);
if (!rss_map->indir_qp) {
err = -ENOMEM;
goto rss_err;
}
/* Configure RSS indirection qp */
err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp, GFP_KERNEL);
err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, rss_map->indir_qp,
GFP_KERNEL);
if (err) {
en_err(priv, "Failed to allocate RSS indirection QP\n");
goto rss_err;
}
rss_map->indir_qp.event = mlx4_en_sqp_event;
rss_map->indir_qp->event = mlx4_en_sqp_event;
mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
priv->rx_ring[0]->cqn, -1, &context);
@ -1164,8 +1203,9 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
err = -EINVAL;
goto indir_err;
}
err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
&rss_map->indir_qp, &rss_map->indir_state);
rss_map->indir_qp, &rss_map->indir_state);
if (err)
goto indir_err;
@ -1173,9 +1213,11 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
indir_err:
mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
MLX4_QP_STATE_RST, NULL, 0, 0, rss_map->indir_qp);
mlx4_qp_remove(mdev->dev, rss_map->indir_qp);
mlx4_qp_free(mdev->dev, rss_map->indir_qp);
kfree(rss_map->indir_qp);
rss_map->indir_qp = NULL;
rss_err:
for (i = 0; i < good_qps; i++) {
mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
@ -1193,10 +1235,15 @@ void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
struct mlx4_en_rss_map *rss_map = &priv->rss_map;
int i;
mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
if (priv->rx_ring_num > 1) {
mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
MLX4_QP_STATE_RST, NULL, 0, 0,
rss_map->indir_qp);
mlx4_qp_remove(mdev->dev, rss_map->indir_qp);
mlx4_qp_free(mdev->dev, rss_map->indir_qp);
kfree(rss_map->indir_qp);
rss_map->indir_qp = NULL;
}
for (i = 0; i < priv->rx_ring_num; i++) {
mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],

305
drivers/net/ethernet/mellanox/mlx4/en_tx.c
View File

@ -234,23 +234,24 @@ static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
u8 owner)
{
__be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
void *end = ring->buf + ring->buf_size;
__be32 *ptr = (__be32 *)tx_desc;
int i;
/* Optimize the common case when there are no wraparounds */
if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
if (likely((void *)tx_desc +
(tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) {
/* Stamp the freed descriptor */
for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE;
i += STAMP_STRIDE) {
*ptr = stamp;
ptr += STAMP_DWORDS;
}
} else {
/* Stamp the freed descriptor */
for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE;
i += STAMP_STRIDE) {
*ptr = stamp;
ptr += STAMP_DWORDS;
@ -265,11 +266,11 @@ static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u8 owner, u64 timestamp,
int index, u64 timestamp,
int napi_mode)
{
struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
void *end = ring->buf + ring->buf_size;
struct sk_buff *skb = tx_info->skb;
@ -288,19 +289,20 @@ u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
skb_tstamp_tx(skb, &hwts);
}
/* Optimize the common case when there are no wraparounds */
if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
if (!tx_info->inl) {
if (tx_info->linear)
dma_unmap_single(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
else
dma_unmap_page(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
if (!tx_info->inl) {
if (tx_info->linear)
dma_unmap_single(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
else
dma_unmap_page(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
/* Optimize the common case when there are no wraparounds */
if (likely((void *)tx_desc +
(tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) {
for (i = 1; i < nr_maps; i++) {
data++;
dma_unmap_page(priv->ddev,
@ -308,23 +310,10 @@ u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
be32_to_cpu(data->byte_count),
PCI_DMA_TODEVICE);
}
}
} else {
if (!tx_info->inl) {
if ((void *) data >= end) {
} else {
if ((void *)data >= end)
data = ring->buf + ((void *)data - end);
}
if (tx_info->linear)
dma_unmap_single(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
else
dma_unmap_page(priv->ddev,
tx_info->map0_dma,
tx_info->map0_byte_count,
PCI_DMA_TODEVICE);
for (i = 1; i < nr_maps; i++) {
data++;
/* Check for wraparound before unmapping */
@ -344,7 +333,7 @@ u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u8 owner, u64 timestamp,
int index, u64 timestamp,
int napi_mode)
{
struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
@ -381,8 +370,7 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
while (ring->cons != ring->prod) {
ring->last_nr_txbb = ring->free_tx_desc(priv, ring,
ring->cons & ring->size_mask,
!!(ring->cons & ring->size), 0,
0 /* Non-NAPI caller */);
0, 0 /* Non-NAPI caller */);
ring->cons += ring->last_nr_txbb;
cnt++;
}
@ -396,15 +384,14 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
return cnt;
}
static bool mlx4_en_process_tx_cq(struct net_device *dev,
struct mlx4_en_cq *cq, int napi_budget)
bool mlx4_en_process_tx_cq(struct net_device *dev,
struct mlx4_en_cq *cq, int napi_budget)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_cq *mcq = &cq->mcq;
struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->type][cq->ring];
struct mlx4_cqe *cqe;
u16 index;
u16 new_index, ring_index, stamp_index;
u16 index, ring_index, stamp_index;
u32 txbbs_skipped = 0;
u32 txbbs_stamp = 0;
u32 cons_index = mcq->cons_index;
@ -419,7 +406,7 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
u32 last_nr_txbb;
u32 ring_cons;
if (!priv->port_up)
if (unlikely(!priv->port_up))
return true;
netdev_txq_bql_complete_prefetchw(ring->tx_queue);
@ -434,6 +421,8 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
/* Process all completed CQEs */
while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
cons_index & size) && (done < budget)) {
u16 new_index;
/*
* make sure we read the CQE after we read the
* ownership bit
@ -464,8 +453,7 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
/* free next descriptor */
last_nr_txbb = ring->free_tx_desc(
priv, ring, ring_index,
!!((ring_cons + txbbs_skipped) &
ring->size), timestamp, napi_budget);
timestamp, napi_budget);
mlx4_en_stamp_wqe(priv, ring, stamp_index,
!!((ring_cons + txbbs_stamp) &
@ -481,7 +469,6 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
}
/*
* To prevent CQ overflow we first update CQ consumer and only then
* the ring consumer.
@ -494,7 +481,7 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
ACCESS_ONCE(ring->last_nr_txbb) = last_nr_txbb;
ACCESS_ONCE(ring->cons) = ring_cons + txbbs_skipped;
if (ring->free_tx_desc == mlx4_en_recycle_tx_desc)
if (cq->type == TX_XDP)
return done < budget;
netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
@ -506,6 +493,7 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
netif_tx_wake_queue(ring->tx_queue);
ring->wake_queue++;
}
return done < budget;
}
@ -526,7 +514,7 @@ int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
struct net_device *dev = cq->dev;
struct mlx4_en_priv *priv = netdev_priv(dev);
int clean_complete;
bool clean_complete;
clean_complete = mlx4_en_process_tx_cq(dev, cq, budget);
if (!clean_complete)
@ -543,7 +531,7 @@ static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
u32 index,
unsigned int desc_size)
{
u32 copy = (ring->size - index) * TXBB_SIZE;
u32 copy = (ring->size - index) << LOG_TXBB_SIZE;
int i;
for (i = desc_size - copy - 4; i >= 0; i -= 4) {
@ -558,12 +546,12 @@ static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
if ((i & (TXBB_SIZE - 1)) == 0)
wmb();
*((u32 *) (ring->buf + index * TXBB_SIZE + i)) =
*((u32 *)(ring->buf + (index << LOG_TXBB_SIZE) + i)) =
*((u32 *) (ring->bounce_buf + i));
}
/* Return real descriptor location */
return ring->buf + index * TXBB_SIZE;
return ring->buf + (index << LOG_TXBB_SIZE);
}
/* Decide if skb can be inlined in tx descriptor to avoid dma mapping
@ -775,37 +763,101 @@ static void mlx4_en_tx_write_desc(struct mlx4_en_tx_ring *ring,
}
}
static bool mlx4_en_build_dma_wqe(struct mlx4_en_priv *priv,
struct skb_shared_info *shinfo,
struct mlx4_wqe_data_seg *data,
struct sk_buff *skb,
int lso_header_size,
__be32 mr_key,
struct mlx4_en_tx_info *tx_info)
{
struct device *ddev = priv->ddev;
dma_addr_t dma = 0;
u32 byte_count = 0;
int i_frag;
/* Map fragments if any */
for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) {
const struct skb_frag_struct *frag;
frag = &shinfo->frags[i_frag];
byte_count = skb_frag_size(frag);
dma = skb_frag_dma_map(ddev, frag,
0, byte_count,
DMA_TO_DEVICE);
if (dma_mapping_error(ddev, dma))
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
data->lkey = mr_key;
dma_wmb();
data->byte_count = cpu_to_be32(byte_count);
--data;
}
/* Map linear part if needed */
if (tx_info->linear) {
byte_count = skb_headlen(skb) - lso_header_size;
dma = dma_map_single(ddev, skb->data +
lso_header_size, byte_count,
PCI_DMA_TODEVICE);
if (dma_mapping_error(ddev, dma))
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
data->lkey = mr_key;
dma_wmb();
data->byte_count = cpu_to_be32(byte_count);
}
/* tx completion can avoid cache line miss for common cases */
tx_info->map0_dma = dma;
tx_info->map0_byte_count = byte_count;
return true;
tx_drop_unmap:
en_err(priv, "DMA mapping error\n");
while (++i_frag < shinfo->nr_frags) {
++data;
dma_unmap_page(ddev, (dma_addr_t)be64_to_cpu(data->addr),
be32_to_cpu(data->byte_count),
PCI_DMA_TODEVICE);
}
return false;
}
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;
struct mlx4_wqe_data_seg *data;
struct mlx4_en_tx_info *tx_info;
int tx_ind = 0;
int tx_ind;
int nr_txbb;
int desc_size;
int real_size;
u32 index, bf_index;
__be32 op_own;
u16 vlan_proto = 0;
int i_frag;
int lso_header_size;
void *fragptr = NULL;
bool bounce = false;
bool send_doorbell;
bool stop_queue;
bool inline_ok;
u8 data_offset;
u32 ring_cons;
bool bf_ok;
tx_ind = skb_get_queue_mapping(skb);
ring = priv->tx_ring[TX][tx_ind];
if (!priv->port_up)
if (unlikely(!priv->port_up))
goto tx_drop;
/* fetch ring->cons far ahead before needing it to avoid stall */
@ -818,7 +870,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
/* Align descriptor to TXBB size */
desc_size = ALIGN(real_size, TXBB_SIZE);
nr_txbb = desc_size / TXBB_SIZE;
nr_txbb = desc_size >> LOG_TXBB_SIZE;
if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
if (netif_msg_tx_err(priv))
en_warn(priv, "Oversized header or SG list\n");
@ -827,6 +879,8 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
bf_ok = ring->bf_enabled;
if (skb_vlan_tag_present(skb)) {
u16 vlan_proto;
qpn_vlan.vlan_tag = cpu_to_be16(skb_vlan_tag_get(skb));
vlan_proto = be16_to_cpu(skb->vlan_proto);
if (vlan_proto == ETH_P_8021AD)
@ -851,7 +905,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
/* See if we have enough space for whole descriptor TXBB for setting
* SW ownership on next descriptor; if not, use a bounce buffer. */
if (likely(index + nr_txbb <= ring->size))
tx_desc = ring->buf + index * TXBB_SIZE;
tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
else {
tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
bounce = true;
@ -863,64 +917,31 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
tx_info->skb = skb;
tx_info->nr_txbb = nr_txbb;
data = &tx_desc->data;
if (lso_header_size)
data = ((void *)&tx_desc->lso + ALIGN(lso_header_size + 4,
DS_SIZE));
if (!lso_header_size) {
data = &tx_desc->data;
data_offset = offsetof(struct mlx4_en_tx_desc, data);
} else {
int lso_align = ALIGN(lso_header_size + 4, DS_SIZE);
data = (void *)&tx_desc->lso + lso_align;
data_offset = offsetof(struct mlx4_en_tx_desc, lso) + lso_align;
}
/* valid only for none inline segments */
tx_info->data_offset = (void *)data - (void *)tx_desc;
tx_info->data_offset = data_offset;
tx_info->inl = inline_ok;
tx_info->linear = (lso_header_size < skb_headlen(skb) &&
!inline_ok) ? 1 : 0;
tx_info->linear = lso_header_size < skb_headlen(skb) && !inline_ok;
tx_info->nr_maps = shinfo->nr_frags + tx_info->linear;
data += tx_info->nr_maps - 1;
if (!tx_info->inl) {
dma_addr_t dma = 0;
u32 byte_count = 0;
/* Map fragments if any */
for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) {
const struct skb_frag_struct *frag;
frag = &shinfo->frags[i_frag];
byte_count = skb_frag_size(frag);
dma = skb_frag_dma_map(ddev, frag,
0, byte_count,
DMA_TO_DEVICE);
if (dma_mapping_error(ddev, dma))
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
data->lkey = ring->mr_key;
dma_wmb();
data->byte_count = cpu_to_be32(byte_count);
--data;
}
/* Map linear part if needed */
if (tx_info->linear) {
byte_count = skb_headlen(skb) - lso_header_size;
dma = dma_map_single(ddev, skb->data +
lso_header_size, byte_count,
PCI_DMA_TODEVICE);
if (dma_mapping_error(ddev, dma))
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
data->lkey = ring->mr_key;
dma_wmb();
data->byte_count = cpu_to_be32(byte_count);
}
/* tx completion can avoid cache line miss for common cases */
tx_info->map0_dma = dma;
tx_info->map0_byte_count = byte_count;
}
if (!tx_info->inl)
if (!mlx4_en_build_dma_wqe(priv, shinfo, data, skb,
lso_header_size, ring->mr_key,
tx_info))
goto tx_drop_count;
/*
* For timestamping add flag to skb_shinfo and
@ -1056,16 +1077,6 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
}
return NETDEV_TX_OK;
tx_drop_unmap:
en_err(priv, "DMA mapping error\n");
while (++i_frag < shinfo->nr_frags) {
++data;
dma_unmap_page(ddev, (dma_addr_t) be64_to_cpu(data->addr),
be32_to_cpu(data->byte_count),
PCI_DMA_TODEVICE);
}
tx_drop_count:
ring->tx_dropped++;
tx_drop:
@ -1073,52 +1084,41 @@ tx_drop:
return NETDEV_TX_OK;
}
#define MLX4_EN_XDP_TX_NRTXBB 1
#define MLX4_EN_XDP_TX_REAL_SZ (((CTRL_SIZE + MLX4_EN_XDP_TX_NRTXBB * DS_SIZE) \
/ 16) & 0x3f)
netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
struct mlx4_en_rx_alloc *frame,
struct net_device *dev, unsigned int length,
int tx_ind, int *doorbell_pending)
int tx_ind, bool *doorbell_pending)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
union mlx4_wqe_qpn_vlan qpn_vlan = {};
struct mlx4_en_tx_ring *ring;
struct mlx4_en_tx_desc *tx_desc;
struct mlx4_wqe_data_seg *data;
struct mlx4_en_tx_info *tx_info;
int index, bf_index;
bool send_doorbell;
int nr_txbb = 1;
bool stop_queue;
struct mlx4_wqe_data_seg *data;
struct mlx4_en_tx_ring *ring;
dma_addr_t dma;
int real_size;
__be32 op_own;
u32 ring_cons;
bool bf_ok;
int index;
BUILD_BUG_ON_MSG(ALIGN(CTRL_SIZE + DS_SIZE, TXBB_SIZE) != TXBB_SIZE,
"mlx4_en_xmit_frame requires minimum size tx desc");
if (unlikely(!priv->port_up))
goto tx_drop;
ring = priv->tx_ring[TX_XDP][tx_ind];
if (!priv->port_up)
goto tx_drop;
if (mlx4_en_is_tx_ring_full(ring))
if (unlikely(mlx4_en_is_tx_ring_full(ring)))
goto tx_drop_count;
/* fetch ring->cons far ahead before needing it to avoid stall */
ring_cons = READ_ONCE(ring->cons);
index = ring->prod & ring->size_mask;
tx_info = &ring->tx_info[index];
bf_ok = ring->bf_enabled;
/* Track current inflight packets for performance analysis */
AVG_PERF_COUNTER(priv->pstats.inflight_avg,
(u32)(ring->prod - ring_cons - 1));
(u32)(ring->prod - READ_ONCE(ring->cons) - 1));
bf_index = ring->prod;
tx_desc = ring->buf + index * TXBB_SIZE;
tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
data = &tx_desc->data;
dma = frame->dma;
@ -1127,9 +1127,9 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
frame->page = NULL;
tx_info->map0_dma = dma;
tx_info->map0_byte_count = PAGE_SIZE;
tx_info->nr_txbb = nr_txbb;
tx_info->nr_txbb = MLX4_EN_XDP_TX_NRTXBB;
tx_info->nr_bytes = max_t(unsigned int, length, ETH_ZLEN);
tx_info->data_offset = (void *)data - (void *)tx_desc;
tx_info->data_offset = offsetof(struct mlx4_en_tx_desc, data);
tx_info->ts_requested = 0;
tx_info->nr_maps = 1;
tx_info->linear = 1;
@ -1153,28 +1153,19 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
rx_ring->xdp_tx++;
AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, length);
ring->prod += nr_txbb;
ring->prod += MLX4_EN_XDP_TX_NRTXBB;
stop_queue = mlx4_en_is_tx_ring_full(ring);
send_doorbell = stop_queue ||
*doorbell_pending > MLX4_EN_DOORBELL_BUDGET;
bf_ok &= send_doorbell;
qpn_vlan.fence_size = MLX4_EN_XDP_TX_REAL_SZ;
real_size = ((CTRL_SIZE + nr_txbb * DS_SIZE) / 16) & 0x3f;
if (bf_ok)
qpn_vlan.bf_qpn = ring->doorbell_qpn | cpu_to_be32(real_size);
else
qpn_vlan.fence_size = real_size;
mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, TXBB_SIZE, bf_index,
op_own, bf_ok, send_doorbell);
*doorbell_pending = send_doorbell ? 0 : *doorbell_pending + 1;
mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, TXBB_SIZE, 0,
op_own, false, false);
*doorbell_pending = true;
return NETDEV_TX_OK;
tx_drop_count:
rx_ring->xdp_tx_full++;
*doorbell_pending = true;
tx_drop:
return NETDEV_TX_BUSY;
}

4
drivers/net/ethernet/mellanox/mlx4/main.c
View File

@ -2356,8 +2356,8 @@ static int mlx4_init_hca(struct mlx4_dev *dev)
MLX4_A0_STEERING_TABLE_SIZE;
}
mlx4_dbg(dev, "DMFS high rate steer mode is: %s\n",
dmfs_high_rate_steering_mode_str(
mlx4_info(dev, "DMFS high rate steer mode is: %s\n",
dmfs_high_rate_steering_mode_str(
dev->caps.dmfs_high_steer_mode));
}
} else {

23
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -72,7 +72,8 @@
#define DEF_RX_RINGS 16
#define MAX_RX_RINGS 128
#define MIN_RX_RINGS 4
#define TXBB_SIZE 64
#define LOG_TXBB_SIZE 6
#define TXBB_SIZE BIT(LOG_TXBB_SIZE)
#define HEADROOM (2048 / TXBB_SIZE + 1)
#define STAMP_STRIDE 64
#define STAMP_DWORDS (STAMP_STRIDE / 4)
@ -115,13 +116,12 @@
#define MLX4_EN_MIN_TX_RING_P_UP 1
#define MLX4_EN_MAX_TX_RING_P_UP 32
#define MLX4_EN_NUM_UP 8
#define MLX4_EN_DEF_TX_RING_SIZE 512
#define MLX4_EN_DEF_RX_RING_SIZE 1024
#define MLX4_EN_DEF_TX_RING_SIZE MLX4_EN_DEF_RX_RING_SIZE
#define MAX_TX_RINGS (MLX4_EN_MAX_TX_RING_P_UP * \
MLX4_EN_NUM_UP)
#define MLX4_EN_DEFAULT_TX_WORK 256
#define MLX4_EN_DOORBELL_BUDGET 8
/* Target number of packets to coalesce with interrupt moderation */
#define MLX4_EN_RX_COAL_TARGET 44
@ -276,7 +276,7 @@ struct mlx4_en_tx_ring {
struct netdev_queue *tx_queue;
u32 (*free_tx_desc)(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u8 owner,
int index,
u64 timestamp, int napi_mode);
struct mlx4_en_rx_ring *recycle_ring;
@ -359,7 +359,10 @@ struct mlx4_en_cq {
struct mlx4_hwq_resources wqres;
int ring;
struct net_device *dev;
struct napi_struct napi;
union {
struct napi_struct napi;
bool xdp_busy;
};
int size;
int buf_size;
int vector;
@ -431,7 +434,7 @@ struct mlx4_en_rss_map {
int base_qpn;
struct mlx4_qp qps[MAX_RX_RINGS];
enum mlx4_qp_state state[MAX_RX_RINGS];
struct mlx4_qp indir_qp;
struct mlx4_qp *indir_qp;
enum mlx4_qp_state indir_state;
};
@ -689,7 +692,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev);
netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
struct mlx4_en_rx_alloc *frame,
struct net_device *dev, unsigned int length,
int tx_ind, int *doorbell_pending);
int tx_ind, bool *doorbell_pending);
void mlx4_en_xmit_doorbell(struct mlx4_en_tx_ring *ring);
bool mlx4_en_rx_recycle(struct mlx4_en_rx_ring *ring,
struct mlx4_en_rx_alloc *frame);
@ -721,13 +724,15 @@ int mlx4_en_process_rx_cq(struct net_device *dev,
int budget);
int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget);
int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget);
bool mlx4_en_process_tx_cq(struct net_device *dev,
struct mlx4_en_cq *cq, int napi_budget);
u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u8 owner, u64 timestamp,
int index, u64 timestamp,
int napi_mode);
u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u8 owner, u64 timestamp,
int index, u64 timestamp,
int napi_mode);
void mlx4_en_fill_qp_context(struct mlx4_en_priv *priv, int size, int stride,
int is_tx, int rss, int qpn, int cqn, int user_prio,