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net: ag71xx: switch to napi_build_skb() to reuse skbuff_heads 

napi_build_skb() reuses NAPI skbuff_head cache in order to save some
cycles on freeing/allocating skbuff_heads on every new Rx or completed
Tx.
Use napi_consume_skb() to feed the cache with skbuff_heads of completed
Tx, so it's never empty. The budget parameter is added to indicate NAPI
context, as a value of zero can be passed in the case of netpoll.

Signed-off-by: Sieng-Piaw Liew <liew.s.piaw@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sieng-Piaw Liew 2022-07-07 22:10:56 +08:00 committed by David S. Miller
parent c2dd4059dc
commit 67d7ebdeb2
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/atheros/ag71xx.c
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@ -786,7 +786,7 @@ static bool ag71xx_check_dma_stuck(struct ag71xx *ag)
return false;
}
static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
static int ag71xx_tx_packets(struct ag71xx *ag, bool flush, int budget)
{
struct ag71xx_ring *ring = &ag->tx_ring;
int sent = 0, bytes_compl = 0, n = 0;
@ -825,7 +825,7 @@ static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
if (!skb)
continue;
dev_kfree_skb_any(skb);
napi_consume_skb(skb, budget);
ring->buf[i].tx.skb = NULL;
bytes_compl += ring->buf[i].tx.len;
@ -970,7 +970,7 @@ static void ag71xx_fast_reset(struct ag71xx *ag)
mii_reg = ag71xx_rr(ag, AG71XX_REG_MII_CFG);
rx_ds = ag71xx_rr(ag, AG71XX_REG_RX_DESC);
ag71xx_tx_packets(ag, true);
ag71xx_tx_packets(ag, true, 0);
reset_control_assert(ag->mac_reset);
usleep_range(10, 20);
@ -1657,7 +1657,7 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
ndev->stats.rx_packets++;
ndev->stats.rx_bytes += pktlen;
skb = build_skb(ring->buf[i].rx.rx_buf, ag71xx_buffer_size(ag));
skb = napi_build_skb(ring->buf[i].rx.rx_buf, ag71xx_buffer_size(ag));
if (!skb) {
skb_free_frag(ring->buf[i].rx.rx_buf);
goto next;
@ -1703,7 +1703,7 @@ static int ag71xx_poll(struct napi_struct *napi, int limit)
int tx_done, rx_done;
u32 status;
tx_done = ag71xx_tx_packets(ag, false);
tx_done = ag71xx_tx_packets(ag, false, limit);
netif_dbg(ag, rx_status, ndev, "processing RX ring\n");
rx_done = ag71xx_rx_packets(ag, limit);