1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// 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)
{
unsigned int active_cpus = min_t(int, priv->num_ntfy_blks / 2,
num_online_cpus());
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;
netif_set_xps_queue(priv->dev, get_cpu_mask(ntfy_idx % active_cpus),
queue_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 padding, struct gve_rx_ctx *ctx)
{
void *va = page_info->page_address + padding + page_info->page_offset;
int skb_linear_offset = 0;
bool set_protocol = false;
struct sk_buff *skb;
if (ctx) {
if (!ctx->skb_head)
ctx->skb_head = napi_alloc_skb(napi, ctx->total_expected_size);
if (unlikely(!ctx->skb_head))
return NULL;
skb = ctx->skb_head;
skb_linear_offset = skb->len;
set_protocol = ctx->curr_frag_cnt == ctx->expected_frag_cnt - 1;
} else {
skb = napi_alloc_skb(napi, len);
set_protocol = true;
}
__skb_put(skb, len);
skb_copy_to_linear_data_offset(skb, skb_linear_offset, va, len);
if (set_protocol)
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);
}
}
|
