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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/* Google virtual Ethernet (gve) driver
*
* Copyright (C) 2015-2021 Google, Inc.
*/
#include "gve.h"
#include "gve_adminq.h"
#include "gve_utils.h"
void gve_tx_remove_from_block(struct gve_priv *priv, int queue_idx)
{
struct gve_notify_block *block =
&priv->ntfy_blocks[gve_tx_idx_to_ntfy(priv, queue_idx)];
block->tx = NULL;
}
void gve_tx_add_to_block(struct gve_priv *priv, int queue_idx)
{
int ntfy_idx = gve_tx_idx_to_ntfy(priv, queue_idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
struct gve_tx_ring *tx = &priv->tx[queue_idx];
block->tx = tx;
tx->ntfy_id = ntfy_idx;
}
void gve_rx_remove_from_block(struct gve_priv *priv, int queue_idx)
{
struct gve_notify_block *block =
&priv->ntfy_blocks[gve_rx_idx_to_ntfy(priv, queue_idx)];
block->rx = NULL;
}
void gve_rx_add_to_block(struct gve_priv *priv, int queue_idx)
{
u32 ntfy_idx = gve_rx_idx_to_ntfy(priv, queue_idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
struct gve_rx_ring *rx = &priv->rx[queue_idx];
block->rx = rx;
rx->ntfy_id = ntfy_idx;
}
struct sk_buff *gve_rx_copy(struct net_device *dev, struct napi_struct *napi,
struct gve_rx_slot_page_info *page_info, u16 len,
u16 pad)
{
struct sk_buff *skb = napi_alloc_skb(napi, len);
void *va = page_info->page_address + pad +
page_info->page_offset;
if (unlikely(!skb))
return NULL;
__skb_put(skb, len);
skb_copy_to_linear_data(skb, va, len);
skb->protocol = eth_type_trans(skb, dev);
return skb;
}
void gve_dec_pagecnt_bias(struct gve_rx_slot_page_info *page_info)
{
page_info->pagecnt_bias--;
if (page_info->pagecnt_bias == 0) {
int pagecount = page_count(page_info->page);
/* If we have run out of bias - set it back up to INT_MAX
* minus the existing refs.
*/
page_info->pagecnt_bias = INT_MAX - pagecount;
/* Set pagecount back up to max. */
page_ref_add(page_info->page, INT_MAX - pagecount);
}
}
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