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net: enetc: rename the buffer reuse helpers 

enetc_put_xdp_buff has nothing to do with XDP, frankly, it is just a
helper to populate the recycle end of the shadow RX BD ring
(next_to_alloc) with a given buffer.

On the other hand, enetc_put_rx_buff plays more tricks than its name
would suggest.

So let's rename enetc_put_rx_buff into enetc_flip_rx_buff to reflect the
half-page buffer reuse tricks that it employs, and enetc_put_xdp_buff
into enetc_put_rx_buff which suggests a more garden-variety operation.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2021-04-17 00:22:17 +03:00 committed by David S. Miller
parent e9e49ae88e
commit 6b04830d5e
1 changed files with 24 additions and 30 deletions
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54
drivers/net/ethernet/freescale/enetc/enetc.c
View File

@ -751,27 +751,35 @@ static struct enetc_rx_swbd *enetc_get_rx_buff(struct enetc_bdr *rx_ring,
return rx_swbd;
}
/* Reuse the current page without performing half-page buffer flipping */
static void enetc_put_rx_buff(struct enetc_bdr *rx_ring,
struct enetc_rx_swbd *rx_swbd)
{
if (likely(enetc_page_reusable(rx_swbd->page))) {
size_t buffer_size = ENETC_RXB_TRUESIZE - rx_ring->buffer_offset;
size_t buffer_size = ENETC_RXB_TRUESIZE - rx_ring->buffer_offset;
enetc_reuse_page(rx_ring, rx_swbd);
dma_sync_single_range_for_device(rx_ring->dev, rx_swbd->dma,
rx_swbd->page_offset,
buffer_size, rx_swbd->dir);
rx_swbd->page = NULL;
}
/* Reuse the current page by performing half-page buffer flipping */
static void enetc_flip_rx_buff(struct enetc_bdr *rx_ring,
struct enetc_rx_swbd *rx_swbd)
{
if (likely(enetc_page_reusable(rx_swbd->page))) {
rx_swbd->page_offset ^= ENETC_RXB_TRUESIZE;
page_ref_inc(rx_swbd->page);
enetc_reuse_page(rx_ring, rx_swbd);
/* sync for use by the device */
dma_sync_single_range_for_device(rx_ring->dev, rx_swbd->dma,
rx_swbd->page_offset,
buffer_size, rx_swbd->dir);
enetc_put_rx_buff(rx_ring, rx_swbd);
} else {
dma_unmap_page(rx_ring->dev, rx_swbd->dma, PAGE_SIZE,
rx_swbd->dir);
rx_swbd->page = NULL;
}
rx_swbd->page = NULL;
}
static struct sk_buff *enetc_map_rx_buff_to_skb(struct enetc_bdr *rx_ring,
@ -791,7 +799,7 @@ static struct sk_buff *enetc_map_rx_buff_to_skb(struct enetc_bdr *rx_ring,
skb_reserve(skb, rx_ring->buffer_offset);
__skb_put(skb, size);
enetc_put_rx_buff(rx_ring, rx_swbd);
enetc_flip_rx_buff(rx_ring, rx_swbd);
return skb;
}
@ -804,7 +812,7 @@ static void enetc_add_rx_buff_to_skb(struct enetc_bdr *rx_ring, int i,
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_swbd->page,
rx_swbd->page_offset, size, ENETC_RXB_TRUESIZE);
enetc_put_rx_buff(rx_ring, rx_swbd);
enetc_flip_rx_buff(rx_ring, rx_swbd);
}
static bool enetc_check_bd_errors_and_consume(struct enetc_bdr *rx_ring,
@ -1142,20 +1150,6 @@ static void enetc_build_xdp_buff(struct enetc_bdr *rx_ring, u32 bd_status,
}
}
/* Reuse the current page without performing half-page buffer flipping */
static void enetc_put_xdp_buff(struct enetc_bdr *rx_ring,
struct enetc_rx_swbd *rx_swbd)
{
enetc_reuse_page(rx_ring, rx_swbd);
dma_sync_single_range_for_device(rx_ring->dev, rx_swbd->dma,
rx_swbd->page_offset,
ENETC_RXB_DMA_SIZE_XDP,
rx_swbd->dir);
rx_swbd->page = NULL;
}
/* Convert RX buffer descriptors to TX buffer descriptors. These will be
* recycled back into the RX ring in enetc_clean_tx_ring. We need to scrub the
* RX software BDs because the ownership of the buffer no longer belongs to the
@ -1194,8 +1188,8 @@ static void enetc_xdp_drop(struct enetc_bdr *rx_ring, int rx_ring_first,
int rx_ring_last)
{
while (rx_ring_first != rx_ring_last) {
enetc_put_xdp_buff(rx_ring,
&rx_ring->rx_swbd[rx_ring_first]);
enetc_put_rx_buff(rx_ring,
&rx_ring->rx_swbd[rx_ring_first]);
enetc_bdr_idx_inc(rx_ring, &rx_ring_first);
}
rx_ring->stats.xdp_drops++;
@ -1316,8 +1310,8 @@ static int enetc_clean_rx_ring_xdp(struct enetc_bdr *rx_ring,
tmp_orig_i = orig_i;
while (orig_i != i) {
enetc_put_rx_buff(rx_ring,
&rx_ring->rx_swbd[orig_i]);
enetc_flip_rx_buff(rx_ring,
&rx_ring->rx_swbd[orig_i]);
enetc_bdr_idx_inc(rx_ring, &orig_i);
}