1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 /* Google virtual Ethernet (gve) driver 3 * 4 * Copyright (C) 2015-2021 Google, Inc. 5 */ 6 7 #include "gve.h" 8 #include "gve_adminq.h" 9 #include "gve_utils.h" 10 11 void gve_tx_remove_from_block(struct gve_priv *priv, int queue_idx) 12 { 13 struct gve_notify_block *block = 14 &priv->ntfy_blocks[gve_tx_idx_to_ntfy(priv, queue_idx)]; 15 16 block->tx = NULL; 17 } 18 19 void gve_tx_add_to_block(struct gve_priv *priv, int queue_idx) 20 { 21 unsigned int active_cpus = min_t(int, priv->num_ntfy_blks / 2, 22 num_online_cpus()); 23 int ntfy_idx = gve_tx_idx_to_ntfy(priv, queue_idx); 24 struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx]; 25 struct gve_tx_ring *tx = &priv->tx[queue_idx]; 26 27 block->tx = tx; 28 tx->ntfy_id = ntfy_idx; 29 netif_set_xps_queue(priv->dev, get_cpu_mask(ntfy_idx % active_cpus), 30 queue_idx); 31 } 32 33 void gve_rx_remove_from_block(struct gve_priv *priv, int queue_idx) 34 { 35 struct gve_notify_block *block = 36 &priv->ntfy_blocks[gve_rx_idx_to_ntfy(priv, queue_idx)]; 37 38 block->rx = NULL; 39 } 40 41 void gve_rx_add_to_block(struct gve_priv *priv, int queue_idx) 42 { 43 u32 ntfy_idx = gve_rx_idx_to_ntfy(priv, queue_idx); 44 struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx]; 45 struct gve_rx_ring *rx = &priv->rx[queue_idx]; 46 47 block->rx = rx; 48 rx->ntfy_id = ntfy_idx; 49 } 50 51 struct sk_buff *gve_rx_copy(struct net_device *dev, struct napi_struct *napi, 52 struct gve_rx_slot_page_info *page_info, u16 len, 53 u16 pad) 54 { 55 struct sk_buff *skb = napi_alloc_skb(napi, len); 56 void *va = page_info->page_address + pad + 57 page_info->page_offset; 58 59 if (unlikely(!skb)) 60 return NULL; 61 62 __skb_put(skb, len); 63 64 skb_copy_to_linear_data(skb, va, len); 65 66 skb->protocol = eth_type_trans(skb, dev); 67 68 return skb; 69 } 70 71 void gve_dec_pagecnt_bias(struct gve_rx_slot_page_info *page_info) 72 { 73 page_info->pagecnt_bias--; 74 if (page_info->pagecnt_bias == 0) { 75 int pagecount = page_count(page_info->page); 76 77 /* If we have run out of bias - set it back up to INT_MAX 78 * minus the existing refs. 79 */ 80 page_info->pagecnt_bias = INT_MAX - pagecount; 81 82 /* Set pagecount back up to max. */ 83 page_ref_add(page_info->page, INT_MAX - pagecount); 84 } 85 } 86