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82fd151d38
Previously, even if just one of the many fragments of a 9k packet required a copy, we'd copy the whole packet into a freshly-allocated 9k-sized linear SKB, and this led to performance issues. By having a pool of pages to copy into, each fragment can be independently handled, leading to a reduced incidence of allocation and copy. Signed-off-by: Shailend Chand <shailend@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
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/* Google virtual Ethernet (gve) driver
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*
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* Copyright (C) 2015-2021 Google, Inc.
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*/
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#include "gve.h"
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#include "gve_adminq.h"
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#include "gve_utils.h"
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void gve_tx_remove_from_block(struct gve_priv *priv, int queue_idx)
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{
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struct gve_notify_block *block =
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&priv->ntfy_blocks[gve_tx_idx_to_ntfy(priv, queue_idx)];
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block->tx = NULL;
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}
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void gve_tx_add_to_block(struct gve_priv *priv, int queue_idx)
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{
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unsigned int active_cpus = min_t(int, priv->num_ntfy_blks / 2,
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num_online_cpus());
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int ntfy_idx = gve_tx_idx_to_ntfy(priv, queue_idx);
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struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
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struct gve_tx_ring *tx = &priv->tx[queue_idx];
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block->tx = tx;
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tx->ntfy_id = ntfy_idx;
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netif_set_xps_queue(priv->dev, get_cpu_mask(ntfy_idx % active_cpus),
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queue_idx);
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}
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void gve_rx_remove_from_block(struct gve_priv *priv, int queue_idx)
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{
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struct gve_notify_block *block =
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&priv->ntfy_blocks[gve_rx_idx_to_ntfy(priv, queue_idx)];
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block->rx = NULL;
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}
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void gve_rx_add_to_block(struct gve_priv *priv, int queue_idx)
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{
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u32 ntfy_idx = gve_rx_idx_to_ntfy(priv, queue_idx);
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struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
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struct gve_rx_ring *rx = &priv->rx[queue_idx];
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block->rx = rx;
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rx->ntfy_id = ntfy_idx;
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}
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struct sk_buff *gve_rx_copy(struct net_device *dev, struct napi_struct *napi,
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struct gve_rx_slot_page_info *page_info, u16 len,
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u16 padding)
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{
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void *va = page_info->page_address + padding + page_info->page_offset;
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struct sk_buff *skb;
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skb = napi_alloc_skb(napi, len);
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if (unlikely(!skb))
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return NULL;
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__skb_put(skb, len);
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skb_copy_to_linear_data_offset(skb, 0, va, len);
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skb->protocol = eth_type_trans(skb, dev);
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return skb;
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}
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void gve_dec_pagecnt_bias(struct gve_rx_slot_page_info *page_info)
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{
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page_info->pagecnt_bias--;
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if (page_info->pagecnt_bias == 0) {
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int pagecount = page_count(page_info->page);
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/* If we have run out of bias - set it back up to INT_MAX
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* minus the existing refs.
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*/
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page_info->pagecnt_bias = INT_MAX - pagecount;
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/* Set pagecount back up to max. */
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page_ref_add(page_info->page, INT_MAX - pagecount);
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}
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}
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