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net: stmmac: Set dma_sync_size to zero for discarded frames 

If a frame is going to be discarded by driver, this frame is never touched
by driver and the cache lines never become dirty obviously,
page_pool_recycle_direct() wastes CPU cycles on unnecessary calling of
page_pool_dma_sync_for_device() to sync entire frame.
page_pool_put_page() with sync_size setting to 0 is the proper method.

Signed-off-by: Furong Xu <0x1207@gmail.com>
Link: https://patch.msgid.link/20250103093733.3872939-1-0x1207@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
pull/1131/head
Furong Xu 2025-01-03 17:37:33 +08:00 committed by Paolo Abeni
parent 49afc040f4
commit 51cfbed198
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -5467,7 +5467,7 @@ read_again:
if (priv->extend_desc)
stmmac_rx_extended_status(priv, &priv->xstats, rx_q->dma_erx + entry);
if (unlikely(status == discard_frame)) {
page_pool_recycle_direct(rx_q->page_pool, buf->page);
page_pool_put_page(rx_q->page_pool, buf->page, 0, true);
buf->page = NULL;
error = 1;
if (!priv->hwts_rx_en)