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Merge branch 'mvpp2-improvements-in-rx-path' 

Matteo Croce says:

====================
mvpp2 improvements in rx path

Refactor some code in the RX path to allow prefetching some data from the
packet header. The first patch is only a refactor, the second one
reduces the data synced, while the third one adds the prefetch.

The packet rate improvement with the second patch is very small (1606 => 1620 kpps),
while the prefetch bumps it up by 14%: 1620 => 1853 kpps.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-10-28 13:44:26 -07:00
parent faf7b8b22b a0c78337dd
commit 7a9eff98a5
1 changed files with 17 additions and 10 deletions
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27
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -2956,14 +2956,13 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
* by the hardware, and the information about the buffer is
* comprised by the RX descriptor.
*/
if (rx_status & MVPP2_RXD_ERR_SUMMARY) {
err_drop_frame:
dev->stats.rx_errors++;
mvpp2_rx_error(port, rx_desc);
/* Return the buffer to the pool */
mvpp2_bm_pool_put(port, pool, dma_addr, phys_addr);
continue;
}
if (rx_status & MVPP2_RXD_ERR_SUMMARY)
goto err_drop_frame;
dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
rx_bytes + MVPP2_MH_SIZE,
DMA_FROM_DEVICE);
prefetch(data);
if (bm_pool->frag_size > PAGE_SIZE)
frag_size = 0;
@ -2982,8 +2981,9 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
goto err_drop_frame;
}
dma_unmap_single(dev->dev.parent, dma_addr,
bm_pool->buf_size, DMA_FROM_DEVICE);
dma_unmap_single_attrs(dev->dev.parent, dma_addr,
bm_pool->buf_size, DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
rcvd_pkts++;
rcvd_bytes += rx_bytes;
@ -2994,6 +2994,13 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
mvpp2_rx_csum(port, rx_status, skb);
napi_gro_receive(napi, skb);
continue;
err_drop_frame:
dev->stats.rx_errors++;
mvpp2_rx_error(port, rx_desc);
/* Return the buffer to the pool */
mvpp2_bm_pool_put(port, pool, dma_addr, phys_addr);
}
if (rcvd_pkts) {