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Date: Tue, 20 Jun 2017 18:17:49 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Björn Töpel <bjorn.topel@...el.com>,
netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/15] i40e: add support for XDP_TX action
From: Björn Töpel <bjorn.topel@...el.com>
This patch adds proper XDP_TX action support. For each Tx ring, an
additional XDP Tx ring is allocated and setup. This version does the
DMA mapping in the fast-path, which will penalize performance for
IOMMU enabled systems. Further, debugfs support is not wired up for
the XDP Tx rings.
Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e.h | 1 +
drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 42 +++-
drivers/net/ethernet/intel/i40e/i40e_main.c | 299 +++++++++++++++++++------
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 118 +++++++++-
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 11 +
5 files changed, 384 insertions(+), 87 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index d3195b29d53c..4250ab55a9f1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -629,6 +629,7 @@ struct i40e_vsi {
/* These are containers of ring pointers, allocated at run-time */
struct i40e_ring **rx_rings;
struct i40e_ring **tx_rings;
+ struct i40e_ring **xdp_rings; /* XDP Tx rings */
u32 active_filters;
u32 promisc_threshold;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 3d58762efbc0..9d3233c2c9cd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1299,6 +1299,17 @@ static void i40e_get_ringparam(struct net_device *netdev,
ring->rx_jumbo_pending = 0;
}
+static bool i40e_active_tx_ring_index(struct i40e_vsi *vsi, u16 index)
+{
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ return index < vsi->num_queue_pairs ||
+ (index >= vsi->alloc_queue_pairs &&
+ index < vsi->alloc_queue_pairs + vsi->num_queue_pairs);
+ }
+
+ return index < vsi->num_queue_pairs;
+}
+
static int i40e_set_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
@@ -1308,6 +1319,7 @@ static int i40e_set_ringparam(struct net_device *netdev,
struct i40e_vsi *vsi = np->vsi;
struct i40e_pf *pf = vsi->back;
u32 new_rx_count, new_tx_count;
+ u16 tx_alloc_queue_pairs;
int timeout = 50;
int i, err = 0;
@@ -1345,6 +1357,8 @@ static int i40e_set_ringparam(struct net_device *netdev,
for (i = 0; i < vsi->num_queue_pairs; i++) {
vsi->tx_rings[i]->count = new_tx_count;
vsi->rx_rings[i]->count = new_rx_count;
+ if (i40e_enabled_xdp_vsi(vsi))
+ vsi->xdp_rings[i]->count = new_tx_count;
}
goto done;
}
@@ -1354,20 +1368,24 @@ static int i40e_set_ringparam(struct net_device *netdev,
* to the Tx and Rx ring structs.
*/
- /* alloc updated Tx resources */
+ /* alloc updated Tx and XDP Tx resources */
+ tx_alloc_queue_pairs = vsi->alloc_queue_pairs *
+ (i40e_enabled_xdp_vsi(vsi) ? 2 : 1);
if (new_tx_count != vsi->tx_rings[0]->count) {
netdev_info(netdev,
"Changing Tx descriptor count from %d to %d.\n",
vsi->tx_rings[0]->count, new_tx_count);
- tx_rings = kcalloc(vsi->alloc_queue_pairs,
+ tx_rings = kcalloc(tx_alloc_queue_pairs,
sizeof(struct i40e_ring), GFP_KERNEL);
if (!tx_rings) {
err = -ENOMEM;
goto done;
}
- for (i = 0; i < vsi->num_queue_pairs; i++) {
- /* clone ring and setup updated count */
+ for (i = 0; i < tx_alloc_queue_pairs; i++) {
+ if (!i40e_active_tx_ring_index(vsi, i))
+ continue;
+
tx_rings[i] = *vsi->tx_rings[i];
tx_rings[i].count = new_tx_count;
/* the desc and bi pointers will be reallocated in the
@@ -1379,6 +1397,8 @@ static int i40e_set_ringparam(struct net_device *netdev,
if (err) {
while (i) {
i--;
+ if (!i40e_active_tx_ring_index(vsi, i))
+ continue;
i40e_free_tx_resources(&tx_rings[i]);
}
kfree(tx_rings);
@@ -1446,9 +1466,11 @@ static int i40e_set_ringparam(struct net_device *netdev,
i40e_down(vsi);
if (tx_rings) {
- for (i = 0; i < vsi->num_queue_pairs; i++) {
- i40e_free_tx_resources(vsi->tx_rings[i]);
- *vsi->tx_rings[i] = tx_rings[i];
+ for (i = 0; i < tx_alloc_queue_pairs; i++) {
+ if (i40e_active_tx_ring_index(vsi, i)) {
+ i40e_free_tx_resources(vsi->tx_rings[i]);
+ *vsi->tx_rings[i] = tx_rings[i];
+ }
}
kfree(tx_rings);
tx_rings = NULL;
@@ -1479,8 +1501,10 @@ static int i40e_set_ringparam(struct net_device *netdev,
free_tx:
/* error cleanup if the Rx allocations failed after getting Tx */
if (tx_rings) {
- for (i = 0; i < vsi->num_queue_pairs; i++)
- i40e_free_tx_resources(&tx_rings[i]);
+ for (i = 0; i < tx_alloc_queue_pairs; i++) {
+ if (i40e_active_tx_ring_index(vsi, i))
+ i40e_free_tx_resources(vsi->tx_rings[i]);
+ }
kfree(tx_rings);
tx_rings = NULL;
}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 89bbe32a5934..7e415bb5a7dc 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -408,6 +408,27 @@ struct rtnl_link_stats64 *i40e_get_vsi_stats_struct(struct i40e_vsi *vsi)
}
/**
+ * i40e_get_netdev_stats_struct_tx - populate stats from a Tx ring
+ * @ring: Tx ring to get statistics from
+ * @stats: statistics entry to be updated
+ **/
+static void i40e_get_netdev_stats_struct_tx(struct i40e_ring *ring,
+ struct rtnl_link_stats64 *stats)
+{
+ u64 bytes, packets;
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&ring->syncp);
+ packets = ring->stats.packets;
+ bytes = ring->stats.bytes;
+ } while (u64_stats_fetch_retry_irq(&ring->syncp, start));
+
+ stats->tx_packets += packets;
+ stats->tx_bytes += bytes;
+}
+
+/**
* i40e_get_netdev_stats_struct - Get statistics for netdev interface
* @netdev: network interface device structure
*
@@ -437,15 +458,8 @@ static void i40e_get_netdev_stats_struct(struct net_device *netdev,
tx_ring = ACCESS_ONCE(vsi->tx_rings[i]);
if (!tx_ring)
continue;
+ i40e_get_netdev_stats_struct_tx(tx_ring, stats);
- do {
- start = u64_stats_fetch_begin_irq(&tx_ring->syncp);
- packets = tx_ring->stats.packets;
- bytes = tx_ring->stats.bytes;
- } while (u64_stats_fetch_retry_irq(&tx_ring->syncp, start));
-
- stats->tx_packets += packets;
- stats->tx_bytes += bytes;
rx_ring = &tx_ring[1];
do {
@@ -456,6 +470,9 @@ static void i40e_get_netdev_stats_struct(struct net_device *netdev,
stats->rx_packets += packets;
stats->rx_bytes += bytes;
+
+ if (i40e_enabled_xdp_vsi(vsi))
+ i40e_get_netdev_stats_struct_tx(&rx_ring[1], stats);
}
rcu_read_unlock();
@@ -2814,6 +2831,12 @@ static int i40e_vsi_setup_tx_resources(struct i40e_vsi *vsi)
for (i = 0; i < vsi->num_queue_pairs && !err; i++)
err = i40e_setup_tx_descriptors(vsi->tx_rings[i]);
+ if (!i40e_enabled_xdp_vsi(vsi))
+ return err;
+
+ for (i = 0; i < vsi->num_queue_pairs && !err; i++)
+ err = i40e_setup_tx_descriptors(vsi->xdp_rings[i]);
+
return err;
}
@@ -2827,12 +2850,17 @@ static void i40e_vsi_free_tx_resources(struct i40e_vsi *vsi)
{
int i;
- if (!vsi->tx_rings)
- return;
+ if (vsi->tx_rings) {
+ for (i = 0; i < vsi->num_queue_pairs; i++)
+ if (vsi->tx_rings[i] && vsi->tx_rings[i]->desc)
+ i40e_free_tx_resources(vsi->tx_rings[i]);
+ }
- for (i = 0; i < vsi->num_queue_pairs; i++)
- if (vsi->tx_rings[i] && vsi->tx_rings[i]->desc)
- i40e_free_tx_resources(vsi->tx_rings[i]);
+ if (vsi->xdp_rings) {
+ for (i = 0; i < vsi->num_queue_pairs; i++)
+ if (vsi->xdp_rings[i] && vsi->xdp_rings[i]->desc)
+ i40e_free_tx_resources(vsi->xdp_rings[i]);
+ }
}
/**
@@ -3093,6 +3121,12 @@ static int i40e_vsi_configure_tx(struct i40e_vsi *vsi)
for (i = 0; (i < vsi->num_queue_pairs) && !err; i++)
err = i40e_configure_tx_ring(vsi->tx_rings[i]);
+ if (!i40e_enabled_xdp_vsi(vsi))
+ return err;
+
+ for (i = 0; (i < vsi->num_queue_pairs) && !err; i++)
+ err = i40e_configure_tx_ring(vsi->xdp_rings[i]);
+
return err;
}
@@ -3237,6 +3271,7 @@ static int i40e_vsi_configure(struct i40e_vsi *vsi)
**/
static void i40e_vsi_configure_msix(struct i40e_vsi *vsi)
{
+ bool has_xdp = i40e_enabled_xdp_vsi(vsi);
struct i40e_pf *pf = vsi->back;
struct i40e_hw *hw = &pf->hw;
u16 vector;
@@ -3267,28 +3302,40 @@ static void i40e_vsi_configure_msix(struct i40e_vsi *vsi)
/* Linked list for the queuepairs assigned to this vector */
wr32(hw, I40E_PFINT_LNKLSTN(vector - 1), qp);
for (q = 0; q < q_vector->num_ringpairs; q++) {
+ u32 nextqp = has_xdp ? qp + vsi->alloc_queue_pairs : qp;
u32 val;
val = I40E_QINT_RQCTL_CAUSE_ENA_MASK |
- (I40E_RX_ITR << I40E_QINT_RQCTL_ITR_INDX_SHIFT) |
- (vector << I40E_QINT_RQCTL_MSIX_INDX_SHIFT) |
- (qp << I40E_QINT_RQCTL_NEXTQ_INDX_SHIFT)|
- (I40E_QUEUE_TYPE_TX
- << I40E_QINT_RQCTL_NEXTQ_TYPE_SHIFT);
+ (I40E_RX_ITR << I40E_QINT_RQCTL_ITR_INDX_SHIFT) |
+ (vector << I40E_QINT_RQCTL_MSIX_INDX_SHIFT) |
+ (nextqp << I40E_QINT_RQCTL_NEXTQ_INDX_SHIFT) |
+ (I40E_QUEUE_TYPE_TX <<
+ I40E_QINT_RQCTL_NEXTQ_TYPE_SHIFT);
wr32(hw, I40E_QINT_RQCTL(qp), val);
+ if (has_xdp) {
+ val = I40E_QINT_TQCTL_CAUSE_ENA_MASK |
+ (I40E_TX_ITR << I40E_QINT_TQCTL_ITR_INDX_SHIFT) |
+ (vector << I40E_QINT_TQCTL_MSIX_INDX_SHIFT) |
+ (qp << I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT) |
+ (I40E_QUEUE_TYPE_TX <<
+ I40E_QINT_TQCTL_NEXTQ_TYPE_SHIFT);
+
+ wr32(hw, I40E_QINT_TQCTL(nextqp), val);
+ }
+
val = I40E_QINT_TQCTL_CAUSE_ENA_MASK |
- (I40E_TX_ITR << I40E_QINT_TQCTL_ITR_INDX_SHIFT) |
- (vector << I40E_QINT_TQCTL_MSIX_INDX_SHIFT) |
- ((qp+1) << I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT)|
- (I40E_QUEUE_TYPE_RX
- << I40E_QINT_TQCTL_NEXTQ_TYPE_SHIFT);
+ (I40E_TX_ITR << I40E_QINT_TQCTL_ITR_INDX_SHIFT) |
+ (vector << I40E_QINT_TQCTL_MSIX_INDX_SHIFT) |
+ ((qp + 1) << I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT) |
+ (I40E_QUEUE_TYPE_RX <<
+ I40E_QINT_TQCTL_NEXTQ_TYPE_SHIFT);
/* Terminate the linked list */
if (q == (q_vector->num_ringpairs - 1))
- val |= (I40E_QUEUE_END_OF_LIST
- << I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT);
+ val |= (I40E_QUEUE_END_OF_LIST <<
+ I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT);
wr32(hw, I40E_QINT_TQCTL(qp), val);
qp++;
@@ -3342,6 +3389,7 @@ static void i40e_enable_misc_int_causes(struct i40e_pf *pf)
**/
static void i40e_configure_msi_and_legacy(struct i40e_vsi *vsi)
{
+ u32 nextqp = i40e_enabled_xdp_vsi(vsi) ? vsi->alloc_queue_pairs : 0;
struct i40e_q_vector *q_vector = vsi->q_vectors[0];
struct i40e_pf *pf = vsi->back;
struct i40e_hw *hw = &pf->hw;
@@ -3362,12 +3410,22 @@ static void i40e_configure_msi_and_legacy(struct i40e_vsi *vsi)
wr32(hw, I40E_PFINT_LNKLST0, 0);
/* Associate the queue pair to the vector and enable the queue int */
- val = I40E_QINT_RQCTL_CAUSE_ENA_MASK |
- (I40E_RX_ITR << I40E_QINT_RQCTL_ITR_INDX_SHIFT) |
+ val = I40E_QINT_RQCTL_CAUSE_ENA_MASK |
+ (I40E_RX_ITR << I40E_QINT_RQCTL_ITR_INDX_SHIFT) |
+ (nextqp << I40E_QINT_RQCTL_NEXTQ_INDX_SHIFT)|
(I40E_QUEUE_TYPE_TX << I40E_QINT_TQCTL_NEXTQ_TYPE_SHIFT);
wr32(hw, I40E_QINT_RQCTL(0), val);
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ val = I40E_QINT_TQCTL_CAUSE_ENA_MASK |
+ (I40E_TX_ITR << I40E_QINT_TQCTL_ITR_INDX_SHIFT)|
+ (I40E_QUEUE_TYPE_TX
+ << I40E_QINT_TQCTL_NEXTQ_TYPE_SHIFT);
+
+ wr32(hw, I40E_QINT_TQCTL(nextqp), val);
+ }
+
val = I40E_QINT_TQCTL_CAUSE_ENA_MASK |
(I40E_TX_ITR << I40E_QINT_TQCTL_ITR_INDX_SHIFT) |
(I40E_QUEUE_END_OF_LIST << I40E_QINT_TQCTL_NEXTQ_INDX_SHIFT);
@@ -3534,6 +3592,9 @@ static void i40e_vsi_disable_irq(struct i40e_vsi *vsi)
for (i = 0; i < vsi->num_queue_pairs; i++) {
wr32(hw, I40E_QINT_TQCTL(vsi->tx_rings[i]->reg_idx), 0);
wr32(hw, I40E_QINT_RQCTL(vsi->rx_rings[i]->reg_idx), 0);
+ if (!i40e_enabled_xdp_vsi(vsi))
+ continue;
+ wr32(hw, I40E_QINT_TQCTL(vsi->xdp_rings[i]->reg_idx), 0);
}
if (pf->flags & I40E_FLAG_MSIX_ENABLED) {
@@ -3836,6 +3897,16 @@ static void i40e_map_vector_to_qp(struct i40e_vsi *vsi, int v_idx, int qp_idx)
q_vector->tx.ring = tx_ring;
q_vector->tx.count++;
+ /* Place XDP Tx ring in the same q_vector ring list as regular Tx */
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ struct i40e_ring *xdp_ring = vsi->xdp_rings[qp_idx];
+
+ xdp_ring->q_vector = q_vector;
+ xdp_ring->next = q_vector->tx.ring;
+ q_vector->tx.ring = xdp_ring;
+ q_vector->tx.count++;
+ }
+
rx_ring->q_vector = q_vector;
rx_ring->next = q_vector->rx.ring;
q_vector->rx.ring = rx_ring;
@@ -4015,6 +4086,33 @@ static void i40e_control_tx_q(struct i40e_pf *pf, int pf_q, bool enable)
}
/**
+ * i40e_control_wait_tx_q - Start/stop Tx queue and wait for completion
+ * @seid: VSI SEID
+ * @pf: the PF structure
+ * @pf_q: the PF queue to configure
+ * @is_xdp: true if the queue is used for XDP
+ * @enable: start or stop the queue
+ **/
+static int i40e_control_wait_tx_q(int seid, struct i40e_pf *pf, int pf_q,
+ bool is_xdp, bool enable)
+{
+ int ret;
+
+ i40e_control_tx_q(pf, pf_q, enable);
+
+ /* wait for the change to finish */
+ ret = i40e_pf_txq_wait(pf, pf_q, enable);
+ if (ret) {
+ dev_info(&pf->pdev->dev,
+ "VSI seid %d %sTx ring %d %sable timeout\n",
+ seid, (is_xdp ? "XDP " : ""), pf_q,
+ (enable ? "en" : "dis"));
+ }
+
+ return ret;
+}
+
+/**
* i40e_vsi_control_tx - Start or stop a VSI's rings
* @vsi: the VSI being configured
* @enable: start or stop the rings
@@ -4026,16 +4124,20 @@ static int i40e_vsi_control_tx(struct i40e_vsi *vsi, bool enable)
pf_q = vsi->base_queue;
for (i = 0; i < vsi->num_queue_pairs; i++, pf_q++) {
- i40e_control_tx_q(pf, pf_q, enable);
+ ret = i40e_control_wait_tx_q(vsi->seid, pf,
+ pf_q,
+ false /*is xdp*/, enable);
+ if (ret)
+ break;
- /* wait for the change to finish */
- ret = i40e_pf_txq_wait(pf, pf_q, enable);
- if (ret) {
- dev_info(&pf->pdev->dev,
- "VSI seid %d Tx ring %d %sable timeout\n",
- vsi->seid, pf_q, (enable ? "en" : "dis"));
+ if (!i40e_enabled_xdp_vsi(vsi))
+ continue;
+
+ ret = i40e_control_wait_tx_q(vsi->seid, pf,
+ pf_q + vsi->alloc_queue_pairs,
+ true /*is xdp*/, enable);
+ if (ret)
break;
- }
}
return ret;
@@ -4547,7 +4649,21 @@ int i40e_vsi_wait_queues_disabled(struct i40e_vsi *vsi)
vsi->seid, pf_q);
return ret;
}
- /* Check and wait for the Tx queue */
+
+ if (!i40e_enabled_xdp_vsi(vsi))
+ goto wait_rx;
+
+ /* Check and wait for the XDP Tx queue */
+ ret = i40e_pf_txq_wait(pf, pf_q + vsi->alloc_queue_pairs,
+ false);
+ if (ret) {
+ dev_info(&pf->pdev->dev,
+ "VSI seid %d XDP Tx ring %d disable timeout\n",
+ vsi->seid, pf_q);
+ return ret;
+ }
+wait_rx:
+ /* Check and wait for the Rx queue */
ret = i40e_pf_rxq_wait(pf, pf_q, false);
if (ret) {
dev_info(&pf->pdev->dev,
@@ -5466,6 +5582,8 @@ void i40e_down(struct i40e_vsi *vsi)
for (i = 0; i < vsi->num_queue_pairs; i++) {
i40e_clean_tx_ring(vsi->tx_rings[i]);
+ if (i40e_enabled_xdp_vsi(vsi))
+ i40e_clean_tx_ring(vsi->xdp_rings[i]);
i40e_clean_rx_ring(vsi->rx_rings[i]);
}
@@ -7535,15 +7653,22 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)
**/
static int i40e_vsi_alloc_arrays(struct i40e_vsi *vsi, bool alloc_qvectors)
{
+ struct i40e_ring **next_rings;
int size;
int ret = 0;
- /* allocate memory for both Tx and Rx ring pointers */
- size = sizeof(struct i40e_ring *) * vsi->alloc_queue_pairs * 2;
+ /* allocate memory for both Tx, XDP Tx and Rx ring pointers */
+ size = sizeof(struct i40e_ring *) * vsi->alloc_queue_pairs *
+ (i40e_enabled_xdp_vsi(vsi) ? 3 : 2);
vsi->tx_rings = kzalloc(size, GFP_KERNEL);
if (!vsi->tx_rings)
return -ENOMEM;
- vsi->rx_rings = &vsi->tx_rings[vsi->alloc_queue_pairs];
+ next_rings = vsi->tx_rings + vsi->alloc_queue_pairs;
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ vsi->xdp_rings = next_rings;
+ next_rings += vsi->alloc_queue_pairs;
+ }
+ vsi->rx_rings = next_rings;
if (alloc_qvectors) {
/* allocate memory for q_vector pointers */
@@ -7663,6 +7788,7 @@ static void i40e_vsi_free_arrays(struct i40e_vsi *vsi, bool free_qvectors)
kfree(vsi->tx_rings);
vsi->tx_rings = NULL;
vsi->rx_rings = NULL;
+ vsi->xdp_rings = NULL;
}
/**
@@ -7746,6 +7872,8 @@ static void i40e_vsi_clear_rings(struct i40e_vsi *vsi)
kfree_rcu(vsi->tx_rings[i], rcu);
vsi->tx_rings[i] = NULL;
vsi->rx_rings[i] = NULL;
+ if (vsi->xdp_rings)
+ vsi->xdp_rings[i] = NULL;
}
}
}
@@ -7756,43 +7884,61 @@ static void i40e_vsi_clear_rings(struct i40e_vsi *vsi)
**/
static int i40e_alloc_rings(struct i40e_vsi *vsi)
{
- struct i40e_ring *tx_ring, *rx_ring;
+ int i, qpv = i40e_enabled_xdp_vsi(vsi) ? 3 : 2;
struct i40e_pf *pf = vsi->back;
- int i;
+ struct i40e_ring *ring;
/* Set basic values in the rings to be used later during open() */
for (i = 0; i < vsi->alloc_queue_pairs; i++) {
/* allocate space for both Tx and Rx in one shot */
- tx_ring = kzalloc(sizeof(struct i40e_ring) * 2, GFP_KERNEL);
- if (!tx_ring)
+ ring = kcalloc(qpv, sizeof(struct i40e_ring), GFP_KERNEL);
+ if (!ring)
goto err_out;
- tx_ring->queue_index = i;
- tx_ring->reg_idx = vsi->base_queue + i;
- tx_ring->ring_active = false;
- tx_ring->vsi = vsi;
- tx_ring->netdev = vsi->netdev;
- tx_ring->dev = &pf->pdev->dev;
- tx_ring->count = vsi->num_desc;
- tx_ring->size = 0;
- tx_ring->dcb_tc = 0;
+ ring->queue_index = i;
+ ring->reg_idx = vsi->base_queue + i;
+ ring->ring_active = false;
+ ring->vsi = vsi;
+ ring->netdev = vsi->netdev;
+ ring->dev = &pf->pdev->dev;
+ ring->count = vsi->num_desc;
+ ring->size = 0;
+ ring->dcb_tc = 0;
if (vsi->back->flags & I40E_FLAG_WB_ON_ITR_CAPABLE)
- tx_ring->flags = I40E_TXR_FLAGS_WB_ON_ITR;
- tx_ring->tx_itr_setting = pf->tx_itr_default;
- vsi->tx_rings[i] = tx_ring;
-
- rx_ring = &tx_ring[1];
- rx_ring->queue_index = i;
- rx_ring->reg_idx = vsi->base_queue + i;
- rx_ring->ring_active = false;
- rx_ring->vsi = vsi;
- rx_ring->netdev = vsi->netdev;
- rx_ring->dev = &pf->pdev->dev;
- rx_ring->count = vsi->num_desc;
- rx_ring->size = 0;
- rx_ring->dcb_tc = 0;
- rx_ring->rx_itr_setting = pf->rx_itr_default;
- vsi->rx_rings[i] = rx_ring;
+ ring->flags = I40E_TXR_FLAGS_WB_ON_ITR;
+ ring->tx_itr_setting = pf->tx_itr_default;
+ vsi->tx_rings[i] = ring++;
+
+ if (!i40e_enabled_xdp_vsi(vsi))
+ goto setup_rx;
+
+ ring->queue_index = vsi->alloc_queue_pairs + i;
+ ring->reg_idx = vsi->base_queue + ring->queue_index;
+ ring->ring_active = false;
+ ring->vsi = vsi;
+ ring->netdev = NULL;
+ ring->dev = &pf->pdev->dev;
+ ring->count = vsi->num_desc;
+ ring->size = 0;
+ ring->dcb_tc = 0;
+ if (vsi->back->flags & I40E_FLAG_WB_ON_ITR_CAPABLE)
+ ring->flags = I40E_TXR_FLAGS_WB_ON_ITR;
+ set_ring_xdp(ring);
+ ring->tx_itr_setting = pf->tx_itr_default;
+ vsi->xdp_rings[i] = ring++;
+
+setup_rx:
+ ring->queue_index = i;
+ ring->reg_idx = vsi->base_queue + i;
+ ring->ring_active = false;
+ ring->vsi = vsi;
+ ring->netdev = vsi->netdev;
+ ring->dev = &pf->pdev->dev;
+ ring->count = vsi->num_desc;
+ ring->size = 0;
+ ring->dcb_tc = 0;
+ ring->rx_itr_setting = pf->rx_itr_default;
+ vsi->rx_rings[i] = ring;
}
return 0;
@@ -9998,6 +10144,7 @@ static int i40e_vsi_setup_vectors(struct i40e_vsi *vsi)
**/
static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)
{
+ u16 alloc_queue_pairs;
struct i40e_pf *pf;
u8 enabled_tc;
int ret;
@@ -10016,11 +10163,14 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)
if (ret)
goto err_vsi;
- ret = i40e_get_lump(pf, pf->qp_pile, vsi->alloc_queue_pairs, vsi->idx);
+ alloc_queue_pairs = vsi->alloc_queue_pairs *
+ (i40e_enabled_xdp_vsi(vsi) ? 2 : 1);
+
+ ret = i40e_get_lump(pf, pf->qp_pile, alloc_queue_pairs, vsi->idx);
if (ret < 0) {
dev_info(&pf->pdev->dev,
"failed to get tracking for %d queues for VSI %d err %d\n",
- vsi->alloc_queue_pairs, vsi->seid, ret);
+ alloc_queue_pairs, vsi->seid, ret);
goto err_vsi;
}
vsi->base_queue = ret;
@@ -10076,6 +10226,7 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
{
struct i40e_vsi *vsi = NULL;
struct i40e_veb *veb = NULL;
+ u16 alloc_queue_pairs;
int ret, i;
int v_idx;
@@ -10163,12 +10314,14 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
else if (type == I40E_VSI_SRIOV)
vsi->vf_id = param1;
/* assign it some queues */
- ret = i40e_get_lump(pf, pf->qp_pile, vsi->alloc_queue_pairs,
- vsi->idx);
+ alloc_queue_pairs = vsi->alloc_queue_pairs *
+ (i40e_enabled_xdp_vsi(vsi) ? 2 : 1);
+
+ ret = i40e_get_lump(pf, pf->qp_pile, alloc_queue_pairs, vsi->idx);
if (ret < 0) {
dev_info(&pf->pdev->dev,
"failed to get tracking for %d queues for VSI %d err=%d\n",
- vsi->alloc_queue_pairs, vsi->seid, ret);
+ alloc_queue_pairs, vsi->seid, ret);
goto err_vsi;
}
vsi->base_queue = ret;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index f744f843bc72..b936febc315a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -630,6 +630,8 @@ static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring,
if (tx_buffer->skb) {
if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB)
kfree(tx_buffer->raw_buf);
+ else if (ring_is_xdp(ring))
+ page_frag_free(tx_buffer->raw_buf);
else
dev_kfree_skb_any(tx_buffer->skb);
if (dma_unmap_len(tx_buffer, len))
@@ -771,8 +773,11 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
total_bytes += tx_buf->bytecount;
total_packets += tx_buf->gso_segs;
- /* free the skb */
- napi_consume_skb(tx_buf->skb, napi_budget);
+ /* free the skb/XDP data */
+ if (ring_is_xdp(tx_ring))
+ page_frag_free(tx_buf->raw_buf);
+ else
+ napi_consume_skb(tx_buf->skb, napi_budget);
/* unmap skb header data */
dma_unmap_single(tx_ring->dev,
@@ -848,6 +853,9 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
tx_ring->arm_wb = true;
}
+ if (ring_is_xdp(tx_ring))
+ return !!budget;
+
/* notify netdev of completed buffers */
netdev_tx_completed_queue(txring_txq(tx_ring),
total_packets, total_bytes);
@@ -1969,6 +1977,10 @@ static bool i40e_is_non_eop(struct i40e_ring *rx_ring,
#define I40E_XDP_PASS 0
#define I40E_XDP_CONSUMED 1
+#define I40E_XDP_TX 2
+
+static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
+ struct i40e_ring *xdp_ring);
/**
* i40e_run_xdp - run an XDP program
@@ -1979,6 +1991,7 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
struct xdp_buff *xdp)
{
int result = I40E_XDP_PASS;
+ struct i40e_ring *xdp_ring;
struct bpf_prog *xdp_prog;
u32 act;
@@ -1992,9 +2005,12 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
switch (act) {
case XDP_PASS:
break;
+ case XDP_TX:
+ xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
+ result = i40e_xmit_xdp_ring(xdp, xdp_ring);
+ break;
default:
bpf_warn_invalid_xdp_action(act);
- case XDP_TX:
case XDP_ABORTED:
trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
/* fallthrough -- handle aborts by dropping packet */
@@ -2008,6 +2024,27 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
}
/**
+ * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region
+ * @rx_ring: Rx ring
+ * @rx_buffer: Rx buffer to adjust
+ * @size: Size of adjustment
+ **/
+static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring,
+ struct i40e_rx_buffer *rx_buffer,
+ unsigned int size)
+{
+#if (PAGE_SIZE < 8192)
+ unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
+
+ rx_buffer->page_offset ^= truesize;
+#else
+ unsigned int truesize = SKB_DATA_ALIGN(i40e_rx_offset(rx_ring) + size);
+
+ rx_buffer->page_offset += truesize;
+#endif
+}
+
+/**
* i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
* @rx_ring: rx descriptor ring to transact packets on
* @budget: Total limit on number of packets to process
@@ -2024,7 +2061,7 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
struct sk_buff *skb = rx_ring->skb;
u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
- bool failure = false;
+ bool failure = false, xdp_xmit = false;
while (likely(total_rx_packets < budget)) {
struct i40e_rx_buffer *rx_buffer;
@@ -2081,9 +2118,14 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
}
if (IS_ERR(skb)) {
+ if (PTR_ERR(skb) == -I40E_XDP_TX) {
+ xdp_xmit = true;
+ i40e_rx_buffer_flip(rx_ring, rx_buffer, size);
+ } else {
+ rx_buffer->pagecnt_bias++;
+ }
total_rx_bytes += size;
total_rx_packets++;
- rx_buffer->pagecnt_bias++;
} else if (skb) {
i40e_add_rx_frag(rx_ring, rx_buffer, skb, size);
} else if (ring_uses_build_skb(rx_ring)) {
@@ -2131,6 +2173,19 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
total_rx_packets++;
}
+ if (xdp_xmit) {
+ struct i40e_ring *xdp_ring;
+
+ xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
+
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch.
+ */
+ wmb();
+
+ writel(xdp_ring->next_to_use, xdp_ring->tail);
+ }
+
rx_ring->skb = skb;
u64_stats_update_begin(&rx_ring->syncp);
@@ -3188,6 +3243,59 @@ static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
}
/**
+ * i40e_xmit_xdp_ring - transmits an XDP buffer to an XDP Tx ring
+ * @xdp: data to transmit
+ * @xdp_ring: XDP Tx ring
+ **/
+static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
+ struct i40e_ring *xdp_ring)
+{
+ u32 size = xdp->data_end - xdp->data;
+ u16 i = xdp_ring->next_to_use;
+ struct i40e_tx_buffer *tx_bi;
+ struct i40e_tx_desc *tx_desc;
+ dma_addr_t dma;
+
+ if (!unlikely(I40E_DESC_UNUSED(xdp_ring))) {
+ xdp_ring->tx_stats.tx_busy++;
+ return I40E_XDP_CONSUMED;
+ }
+
+ dma = dma_map_single(xdp_ring->dev, xdp->data, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(xdp_ring->dev, dma))
+ return I40E_XDP_CONSUMED;
+
+ tx_bi = &xdp_ring->tx_bi[i];
+ tx_bi->bytecount = size;
+ tx_bi->gso_segs = 1;
+ tx_bi->raw_buf = xdp->data;
+
+ /* record length, and DMA address */
+ dma_unmap_len_set(tx_bi, len, size);
+ dma_unmap_addr_set(tx_bi, dma, dma);
+
+ tx_desc = I40E_TX_DESC(xdp_ring, i);
+ tx_desc->buffer_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC
+ | I40E_TXD_CMD,
+ 0, size, 0);
+
+ /* Make certain all of the status bits have been updated
+ * before next_to_watch is written.
+ */
+ smp_wmb();
+
+ i++;
+ if (i == xdp_ring->count)
+ i = 0;
+
+ tx_bi->next_to_watch = tx_desc;
+ xdp_ring->next_to_use = i;
+
+ return I40E_XDP_TX;
+}
+
+/**
* i40e_xmit_frame_ring - Sends buffer on Tx ring
* @skb: send buffer
* @tx_ring: ring to send buffer on
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 31f0b162996f..b288d58313a6 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -396,6 +396,7 @@ struct i40e_ring {
u16 flags;
#define I40E_TXR_FLAGS_WB_ON_ITR BIT(0)
#define I40E_RXR_FLAGS_BUILD_SKB_ENABLED BIT(1)
+#define I40E_TXR_FLAGS_XDP BIT(2)
/* stats structs */
struct i40e_queue_stats stats;
@@ -438,6 +439,16 @@ static inline void clear_ring_build_skb_enabled(struct i40e_ring *ring)
ring->flags &= ~I40E_RXR_FLAGS_BUILD_SKB_ENABLED;
}
+static inline bool ring_is_xdp(struct i40e_ring *ring)
+{
+ return !!(ring->flags & I40E_TXR_FLAGS_XDP);
+}
+
+static inline void set_ring_xdp(struct i40e_ring *ring)
+{
+ ring->flags |= I40E_TXR_FLAGS_XDP;
+}
+
enum i40e_latency_range {
I40E_LOWEST_LATENCY = 0,
I40E_LOW_LATENCY = 1,
--
2.12.2
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