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Message-Id: <20180131135356.19134-25-bjorn.topel@gmail.com>
Date: Wed, 31 Jan 2018 14:53:56 +0100
From: Björn Töpel <bjorn.topel@...il.com>
To: bjorn.topel@...il.com, magnus.karlsson@...el.com,
alexander.h.duyck@...el.com, alexander.duyck@...il.com,
john.fastabend@...il.com, ast@...com, brouer@...hat.com,
willemdebruijn.kernel@...il.com, daniel@...earbox.net,
netdev@...r.kernel.org
Cc: michael.lundkvist@...csson.com, jesse.brandeburg@...el.com,
anjali.singhai@...el.com, jeffrey.b.shaw@...el.com,
ferruh.yigit@...el.com, qi.z.zhang@...el.com
Subject: [RFC PATCH 24/24] i40e: Tx support for zero copy allocator
From: Magnus Karlsson <magnus.karlsson@...el.com>
Used with AF_XDP sockets.
Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 86 ++++++++++-
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 218 +++++++++++++++++++++-------
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 18 ++-
3 files changed, 255 insertions(+), 67 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 95b8942a31ae..85cde6b228e6 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -10027,6 +10027,22 @@ static void i40e_vsi_clear_rings(struct i40e_vsi *vsi)
}
}
+static void i40e_restore_xsk_tx(struct i40e_vsi *vsi, int qid,
+ struct i40e_ring *xdp_ring)
+{
+ if (!vsi->xsk_ctxs)
+ return;
+
+ if (qid < 0 || qid >= vsi->num_xsk_ctxs)
+ return;
+
+ if (!vsi->xsk_ctxs[qid])
+ return;
+
+ xdp_ring->xsk_tx_completion = vsi->xsk_ctxs[qid]->tx_comp;
+ xdp_ring->get_packet = vsi->xsk_ctxs[qid]->get_tx_packet;
+}
+
/**
* i40e_alloc_rings - Allocates the Rx and Tx rings for the provided VSI
* @vsi: the VSI being configured
@@ -10072,10 +10088,13 @@ static int i40e_alloc_rings(struct i40e_vsi *vsi)
ring->size = 0;
ring->dcb_tc = 0;
ring->clean_tx = i40e_xdp_clean_tx_irq;
+ ring->xdp_tx_completion.func = i40e_xdp_tx_completion;
+ ring->xdp_tx_completion.ctx1 = (unsigned long)ring;
if (vsi->back->hw_features & I40E_HW_WB_ON_ITR_CAPABLE)
ring->flags = I40E_TXR_FLAGS_WB_ON_ITR;
set_ring_xdp(ring);
ring->tx_itr_setting = pf->tx_itr_default;
+ i40e_restore_xsk_tx(vsi, i, ring);
vsi->xdp_rings[i] = ring++;
setup_rx:
@@ -11985,8 +12004,54 @@ static void i40e_remove_xsk_ctx(struct i40e_vsi *vsi, int queue_id)
i40e_free_xsk_ctxs_if_last(vsi);
}
-static int i40e_xsk_enable(struct net_device *netdev, u32 qid,
- struct xsk_rx_parms *parms)
+static int i40e_xsk_tx_enable(struct i40e_vsi *vsi, u32 qid,
+ struct xsk_tx_parms *parms)
+{
+ struct i40e_ring *xdp_ring = NULL;
+ int err;
+
+ if (qid >= vsi->num_queue_pairs)
+ return -EINVAL;
+
+ if (!parms->tx_completion || !parms->get_tx_packet)
+ return -EINVAL;
+
+ err = parms->dma_map(parms->buff_pool, &vsi->back->pdev->dev,
+ DMA_TO_DEVICE, 0);
+ if (err)
+ return err;
+
+ vsi->xsk_ctxs[qid]->tx_comp.func = parms->tx_completion;
+ vsi->xsk_ctxs[qid]->tx_comp.ctx1 = parms->ctx1;
+ vsi->xsk_ctxs[qid]->tx_comp.ctx2 = parms->ctx2;
+ vsi->xsk_ctxs[qid]->get_tx_packet = parms->get_tx_packet;
+
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ xdp_ring = vsi->tx_rings[qid + vsi->alloc_queue_pairs];
+ xdp_ring->xsk_tx_completion.func = parms->tx_completion;
+ xdp_ring->xsk_tx_completion.ctx1 = parms->ctx1;
+ xdp_ring->xsk_tx_completion.ctx2 = parms->ctx2;
+ xdp_ring->get_packet = parms->get_tx_packet;
+ }
+
+ return 0;
+}
+
+static void i40e_xsk_tx_disable(struct i40e_vsi *vsi, u32 queue_id)
+{
+ struct i40e_ring *xdp_ring;
+
+ if (i40e_enabled_xdp_vsi(vsi)) {
+ xdp_ring = vsi->tx_rings[queue_id + vsi->alloc_queue_pairs];
+ xdp_ring->xsk_tx_completion.func = NULL;
+ xdp_ring->xsk_tx_completion.ctx1 = 0;
+ xdp_ring->xsk_tx_completion.ctx2 = 0;
+ xdp_ring->get_packet = NULL;
+ }
+}
+
+static int i40e_xsk_rx_enable(struct net_device *netdev, u32 qid,
+ struct xsk_rx_parms *parms)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
@@ -12029,8 +12094,8 @@ static int i40e_xsk_enable(struct net_device *netdev, u32 qid,
return 0;
}
-static int i40e_xsk_disable(struct net_device *netdev, u32 qid,
- struct xsk_rx_parms *parms)
+static int i40e_xsk_rx_disable(struct net_device *netdev, u32 qid,
+ struct xsk_rx_parms *parms)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
@@ -12069,6 +12134,7 @@ static int i40e_xdp(struct net_device *dev,
{
struct i40e_netdev_priv *np = netdev_priv(dev);
struct i40e_vsi *vsi = np->vsi;
+ int err;
if (vsi->type != I40E_VSI_MAIN)
return -EINVAL;
@@ -12081,11 +12147,14 @@ static int i40e_xdp(struct net_device *dev,
xdp->prog_id = vsi->xdp_prog ? vsi->xdp_prog->aux->id : 0;
return 0;
case XDP_REGISTER_XSK:
- return i40e_xsk_enable(dev, xdp->xsk.queue_id,
- xdp->xsk.rx_parms);
+ err = i40e_xsk_rx_enable(dev, xdp->xsk.queue_id,
+ xdp->xsk.rx_parms);
+ return err ?: i40e_xsk_tx_enable(vsi, xdp->xsk.queue_id,
+ xdp->xsk.tx_parms);
case XDP_UNREGISTER_XSK:
- return i40e_xsk_disable(dev, xdp->xsk.queue_id,
- xdp->xsk.rx_parms);
+ i40e_xsk_tx_disable(vsi, xdp->xsk.queue_id);
+ return i40e_xsk_rx_disable(dev, xdp->xsk.queue_id,
+ xdp->xsk.rx_parms);
default:
return -EINVAL;
}
@@ -12125,6 +12194,7 @@ static const struct net_device_ops i40e_netdev_ops = {
.ndo_bridge_setlink = i40e_ndo_bridge_setlink,
.ndo_bpf = i40e_xdp,
.ndo_xdp_xmit = i40e_xdp_xmit,
+ .ndo_xdp_xmit_xsk = i40e_xdp_xmit_xsk,
.ndo_xdp_flush = i40e_xdp_flush,
};
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 7ab49146d15c..7e9453514df0 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -627,16 +627,21 @@ static void i40e_fd_handle_status(struct i40e_ring *rx_ring,
* @ring: the ring that owns the buffer
* @tx_buffer: the buffer to free
**/
-static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring,
- struct i40e_tx_buffer *tx_buffer)
+static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring, int i)
{
+ struct i40e_tx_buffer *tx_buffer = &ring->tx_bi[i];
+
if (tx_buffer->skb) {
- if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB)
+ 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
+ } else if (ring_is_xdp(ring)) {
+ struct i40e_tx_completion *comp =
+ tx_buffer->completion;
+
+ comp->func(i, 1, comp->ctx1, comp->ctx2);
+ } else {
dev_kfree_skb_any(tx_buffer->skb);
+ }
if (dma_unmap_len(tx_buffer, len))
dma_unmap_single(ring->dev,
dma_unmap_addr(tx_buffer, dma),
@@ -670,7 +675,7 @@ void i40e_clean_tx_ring(struct i40e_ring *tx_ring)
/* Free all the Tx ring sk_buffs */
for (i = 0; i < tx_ring->count; i++)
- i40e_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]);
+ i40e_unmap_and_free_tx_resource(tx_ring, i);
bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
memset(tx_ring->tx_bi, 0, bi_size);
@@ -781,6 +786,16 @@ void i40e_detect_recover_hung(struct i40e_vsi *vsi)
}
}
+static inline void i40e_xdp_ring_update_tail(struct i40e_ring *xdp_ring)
+{
+ /* 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);
+}
+
#define WB_STRIDE 4
static void i40e_update_stats_and_arm_wb(struct i40e_ring *tx_ring,
@@ -812,8 +827,8 @@ static void i40e_update_stats_and_arm_wb(struct i40e_ring *tx_ring,
}
}
-static void i40e_xdp_tx_completion(u32 start, u32 npackets,
- unsigned long ctx1, unsigned long ctx2)
+void i40e_xdp_tx_completion(u32 start, u32 npackets,
+ unsigned long ctx1, unsigned long ctx2)
{
struct i40e_ring *tx_ring = (struct i40e_ring *)ctx1;
struct i40e_tx_buffer *tx_buf;
@@ -843,6 +858,72 @@ static void i40e_xdp_tx_completion(u32 start, u32 npackets,
}
}
+static bool i40e_xmit_xsk(struct i40e_ring *xdp_ring)
+{
+ struct i40e_vsi *vsi = xdp_ring->vsi;
+ struct i40e_tx_buffer *tx_bi;
+ struct i40e_tx_desc *tx_desc;
+ bool packets_pending = false;
+ bool packets_sent = false;
+ dma_addr_t dma;
+ void *data;
+ u32 offset;
+ u32 len;
+
+ if (!xdp_ring->get_packet)
+ return 0;
+
+ if (unlikely(!I40E_DESC_UNUSED(xdp_ring))) {
+ xdp_ring->tx_stats.tx_busy++;
+ return false;
+ }
+
+ packets_pending = xdp_ring->get_packet(xdp_ring->netdev,
+ xdp_ring->queue_index -
+ vsi->alloc_queue_pairs,
+ &dma, &data, &len, &offset);
+ while (packets_pending) {
+ packets_sent = true;
+ dma_sync_single_for_device(xdp_ring->dev, dma, len,
+ DMA_TO_DEVICE);
+
+ tx_bi = &xdp_ring->tx_bi[xdp_ring->next_to_use];
+ tx_bi->bytecount = len;
+ tx_bi->gso_segs = 1;
+ tx_bi->raw_buf = data;
+ tx_bi->completion = &xdp_ring->xsk_tx_completion;
+
+ tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use);
+ tx_desc->buffer_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC
+ | I40E_TX_DESC_CMD_EOP,
+ 0, len, 0);
+
+ xdp_ring->next_to_use++;
+ if (xdp_ring->next_to_use == xdp_ring->count)
+ xdp_ring->next_to_use = 0;
+
+ packets_pending = xdp_ring->get_packet(xdp_ring->netdev,
+ xdp_ring->queue_index -
+ vsi->alloc_queue_pairs,
+ &dma, &data, &len,
+ &offset);
+ if (unlikely(!I40E_DESC_UNUSED(xdp_ring))) {
+ xdp_ring->tx_stats.tx_busy++;
+ break;
+ }
+ }
+
+ /* Request an interrupt for the last frame. */
+ if (packets_sent)
+ tx_desc->cmd_type_offset_bsz |= (I40E_TX_DESC_CMD_RS <<
+ I40E_TXD_QW1_CMD_SHIFT);
+
+ i40e_xdp_ring_update_tail(xdp_ring);
+
+ return !packets_pending;
+}
+
/**
* i40e_xdp_clean_tx_irq - Reclaim resources after transmit completes
* @vsi: the VSI we care about
@@ -855,7 +936,6 @@ static void i40e_xdp_tx_completion(u32 start, u32 npackets,
bool i40e_xdp_clean_tx_irq(struct i40e_vsi *vsi,
struct i40e_ring *tx_ring, int napi_budget)
{
- u16 i = tx_ring->next_to_clean;
struct i40e_tx_buffer *tx_buf;
struct i40e_tx_desc *tx_head;
struct i40e_tx_desc *tx_desc;
@@ -864,50 +944,43 @@ bool i40e_xdp_clean_tx_irq(struct i40e_vsi *vsi,
struct i40e_tx_buffer *prev_buf;
unsigned int packets_completed = 0;
u16 start = tx_ring->next_to_clean;
+ bool xmit_done;
- tx_buf = &tx_ring->tx_bi[i];
+ tx_buf = &tx_ring->tx_bi[tx_ring->next_to_clean];
prev_buf = tx_buf;
- tx_desc = I40E_TX_DESC(tx_ring, i);
- i -= tx_ring->count;
tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring));
do {
- struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch;
-
- /* if next_to_watch is not set then there is no work pending */
- if (!eop_desc)
- break;
+ tx_desc = I40E_TX_DESC(tx_ring, tx_ring->next_to_clean);
- /* prevent any other reads prior to eop_desc */
- smp_rmb();
-
- i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
/* we have caught up to head, no work left to do */
if (tx_head == tx_desc)
break;
- /* clear next_to_watch to prevent false hangs */
- tx_buf->next_to_watch = NULL;
+ tx_desc->buffer_addr = 0;
+ tx_desc->cmd_type_offset_bsz = 0;
/* update the statistics for this packet */
total_bytes += tx_buf->bytecount;
total_packets += tx_buf->gso_segs;
if (prev_buf->completion != tx_buf->completion) {
- prev_buf->completion(start, packets_completed,
- prev_buf->ctx1, prev_buf->ctx2);
+ struct i40e_tx_completion *comp = prev_buf->completion;
+
+ comp->func(start, packets_completed,
+ comp->ctx1, comp->ctx2);
packets_completed = 0;
- start = i + tx_ring->count - 1;
+ start = tx_ring->next_to_clean;
}
packets_completed++;
/* move us one more past the eop_desc for start of next pkt */
prev_buf = tx_buf++;
tx_desc++;
- i++;
- if (unlikely(!i)) {
- i -= tx_ring->count;
+ tx_ring->next_to_clean++;
+ if (unlikely(tx_ring->next_to_clean == tx_ring->count)) {
+ tx_ring->next_to_clean = 0;
tx_buf = tx_ring->tx_bi;
tx_desc = I40E_TX_DESC(tx_ring, 0);
}
@@ -918,16 +991,18 @@ bool i40e_xdp_clean_tx_irq(struct i40e_vsi *vsi,
budget--;
} while (likely(budget));
- if (packets_completed > 0)
- prev_buf->completion(start, packets_completed,
- prev_buf->ctx1, prev_buf->ctx2);
+ if (packets_completed > 0) {
+ struct i40e_tx_completion *comp = prev_buf->completion;
+
+ comp->func(start, packets_completed, comp->ctx1, comp->ctx2);
+ }
- i += tx_ring->count;
- tx_ring->next_to_clean = i;
i40e_update_stats_and_arm_wb(tx_ring, vsi, total_packets,
total_bytes, budget);
- return !!budget;
+ xmit_done = i40e_xmit_xsk(tx_ring);
+
+ return !!budget && xmit_done;
}
/**
@@ -1001,7 +1076,7 @@ bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
i -= tx_ring->count;
tx_buf = tx_ring->tx_bi;
tx_desc = I40E_TX_DESC(tx_ring, 0);
- }
+ }
/* unmap any remaining paged data */
if (dma_unmap_len(tx_buf, len)) {
@@ -2086,16 +2161,6 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
return ERR_PTR(-result);
}
-static inline void i40e_xdp_ring_update_tail(struct i40e_ring *xdp_ring)
-{
- /* 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);
-}
-
/**
* i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
* @rx_ring: rx descriptor ring to transact packets on
@@ -3264,7 +3329,7 @@ static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
/* clear dma mappings for failed tx_bi map */
for (;;) {
tx_bi = &tx_ring->tx_bi[i];
- i40e_unmap_and_free_tx_resource(tx_ring, tx_bi);
+ i40e_unmap_and_free_tx_resource(tx_ring, i);
if (tx_bi == first)
break;
if (i == 0)
@@ -3304,8 +3369,7 @@ static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
tx_bi->bytecount = size;
tx_bi->gso_segs = 1;
tx_bi->raw_buf = xdp->data;
- tx_bi->completion = i40e_xdp_tx_completion;
- tx_bi->ctx1 = (unsigned long)xdp_ring;
+ tx_bi->completion = &xdp_ring->xdp_tx_completion;
/* record length, and DMA address */
dma_unmap_len_set(tx_bi, len, size);
@@ -3317,16 +3381,10 @@ static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
| 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;
@@ -3501,6 +3559,54 @@ int i40e_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp)
return 0;
}
+/**
+ * i40e_napi_is_scheduled - If napi is running, set the NAPIF_STATE_MISSED
+ * @n: napi context
+ *
+ * Returns true if NAPI is scheduled.
+ **/
+static bool i40e_napi_is_scheduled(struct napi_struct *n)
+{
+ unsigned long val, new;
+
+ do {
+ val = READ_ONCE(n->state);
+ if (val & NAPIF_STATE_DISABLE)
+ return true;
+
+ if (!(val & NAPIF_STATE_SCHED))
+ return false;
+
+ new = val | NAPIF_STATE_MISSED;
+ } while (cmpxchg(&n->state, val, new) != val);
+
+ return true;
+}
+
+/**
+ * i40e_xdp_xmit_xsk - Implements ndo_xdp_xmit_xsk
+ * @dev: netdev
+ * @queue_id: queue pair index
+ *
+ * Returns zero if sent, else an error code
+ **/
+int i40e_xdp_xmit_xsk(struct net_device *dev, u32 queue_id)
+{
+ struct i40e_netdev_priv *np = netdev_priv(dev);
+ struct i40e_vsi *vsi = np->vsi;
+ struct i40e_ring *tx_ring;
+
+ if (test_bit(__I40E_VSI_DOWN, vsi->state))
+ return -EAGAIN;
+
+ tx_ring = vsi->tx_rings[queue_id + vsi->alloc_queue_pairs];
+
+ if (!i40e_napi_is_scheduled(&tx_ring->q_vector->napi))
+ i40e_force_wb(vsi, tx_ring->q_vector);
+
+ return 0;
+}
+
/**
* i40e_xdp_flush - Implements ndo_xdp_flush
* @dev: netdev
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 6f8ce176e509..81c47ec77ec9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -253,17 +253,21 @@ typedef int (*get_tx_packet_func)(struct net_device *dev, u32 queue_id,
dma_addr_t *dma, void **data, u32 *len,
u32 *offset);
+struct i40e_tx_completion {
+ tx_completion_func func;
+ unsigned long ctx1;
+ unsigned long ctx2;
+};
+
struct i40e_tx_buffer {
struct i40e_tx_desc *next_to_watch;
union {
struct sk_buff *skb;
void *raw_buf;
};
+ struct i40e_tx_completion *completion;
unsigned int bytecount;
unsigned short gso_segs;
- tx_completion_func completion;
- unsigned long ctx1;
- unsigned long ctx2;
DEFINE_DMA_UNMAP_ADDR(dma);
DEFINE_DMA_UNMAP_LEN(len);
@@ -306,6 +310,8 @@ struct i40e_xsk_ctx {
struct buff_pool *buff_pool;
void *err_ctx;
void (*err_handler)(void *ctx, int errno);
+ struct i40e_tx_completion tx_comp;
+ get_tx_packet_func get_tx_packet;
};
/* some useful defines for virtchannel interface, which
@@ -395,6 +401,9 @@ struct i40e_ring {
struct i40e_xsk_ctx *xsk;
bool (*clean_tx)(struct i40e_vsi *vsi,
struct i40e_ring *tx_ring, int napi_budget);
+ get_tx_packet_func get_packet;
+ struct i40e_tx_completion xdp_tx_completion;
+ struct i40e_tx_completion xsk_tx_completion;
} ____cacheline_internodealigned_in_smp;
static inline bool ring_uses_build_skb(struct i40e_ring *ring)
@@ -484,11 +493,14 @@ void i40e_detect_recover_hung(struct i40e_vsi *vsi);
int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size);
bool __i40e_chk_linearize(struct sk_buff *skb);
int i40e_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp);
+int i40e_xdp_xmit_xsk(struct net_device *dev, u32 queue_id);
void i40e_xdp_flush(struct net_device *dev);
bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
struct i40e_ring *tx_ring, int napi_budget);
bool i40e_xdp_clean_tx_irq(struct i40e_vsi *vsi,
struct i40e_ring *tx_ring, int napi_budget);
+void i40e_xdp_tx_completion(u32 start, u32 npackets,
+ unsigned long ctx1, unsigned long ctx2);
/**
* i40e_get_head - Retrieve head from head writeback
--
2.14.1
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