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net: Take common prefetch code structure into a function 

Many device drivers use the same prefetch code structure to
deal with small L1 cacheline size.
Take this code into a function and call it from the drivers.

Suggested-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tariq Toukan 2020-08-26 15:54:16 +03:00 committed by David S. Miller
parent 04e006b483
commit f468f21b7a
12 changed files with 39 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/ethernet/chelsio/cxgb3/sge.c
View File

@ -2372,10 +2372,7 @@ no_mem:
if (fl->use_pages) {
void *addr = fl->sdesc[fl->cidx].pg_chunk.va;
prefetch(addr);
#if L1_CACHE_BYTES < 128
prefetch(addr + L1_CACHE_BYTES);
#endif
net_prefetch(addr);
__refill_fl(adap, fl);
if (lro > 0) {
lro_add_page(adap, qs, fl,

5
drivers/net/ethernet/hisilicon/hns/hns_enet.c
View File

@ -557,10 +557,7 @@ static int hns_nic_poll_rx_skb(struct hns_nic_ring_data *ring_data,
va = (unsigned char *)desc_cb->buf + desc_cb->page_offset;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
skb = *out_skb = napi_alloc_skb(&ring_data->napi,
HNS_RX_HEAD_SIZE);

5
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View File

@ -3091,10 +3091,7 @@ static int hns3_handle_rx_bd(struct hns3_enet_ring *ring)
* lines. In such a case, single fetch would suffice to cache in the
* relevant part of the header.
*/
prefetch(ring->va);
#if L1_CACHE_BYTES < 128
prefetch(ring->va + L1_CACHE_BYTES);
#endif
net_prefetch(ring->va);
if (!skb) {
ret = hns3_alloc_skb(ring, length, ring->va);

5
drivers/net/ethernet/intel/fm10k/fm10k_main.c
View File

@ -310,10 +310,7 @@ static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
rx_buffer->page_offset;
/* prefetch first cache line of first page */
prefetch(page_addr);
#if L1_CACHE_BYTES < 128
prefetch((void *)((u8 *)page_addr + L1_CACHE_BYTES));
#endif
net_prefetch(page_addr);
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi,

12
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1992,10 +1992,8 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data);
/* Note, we get here by enabling legacy-rx via:
*
* ethtool --set-priv-flags <dev> legacy-rx on
@ -2078,10 +2076,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
* likely have a consumer accessing first few bytes of meta
* data, and then actual data.
*/
prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data_meta + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data_meta);
/* build an skb around the page buffer */
skb = build_skb(xdp->data_hard_start, truesize);
if (unlikely(!skb))

11
drivers/net/ethernet/intel/iavf/iavf_txrx.c
View File

@ -1309,10 +1309,7 @@ static struct sk_buff *iavf_construct_skb(struct iavf_ring *rx_ring,
return NULL;
/* prefetch first cache line of first page */
va = page_address(rx_buffer->page) + rx_buffer->page_offset;
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* allocate a skb to store the frags */
skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
@ -1376,10 +1373,8 @@ static struct sk_buff *iavf_build_skb(struct iavf_ring *rx_ring,
return NULL;
/* prefetch first cache line of first page */
va = page_address(rx_buffer->page) + rx_buffer->page_offset;
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* build an skb around the page buffer */
skb = build_skb(va - IAVF_SKB_PAD, truesize);
if (unlikely(!skb))

10
drivers/net/ethernet/intel/ice/ice_txrx.c
View File

@ -919,10 +919,7 @@ ice_build_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
* likely have a consumer accessing first few bytes of meta
* data, and then actual data.
*/
prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
prefetch((void *)(xdp->data + L1_CACHE_BYTES));
#endif
net_prefetch(xdp->data_meta);
/* build an skb around the page buffer */
skb = build_skb(xdp->data_hard_start, truesize);
if (unlikely(!skb))
@ -964,10 +961,7 @@ ice_construct_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch((void *)(xdp->data + L1_CACHE_BYTES));
#endif /* L1_CACHE_BYTES */
net_prefetch(xdp->data);
/* allocate a skb to store the frags */
skb = __napi_alloc_skb(&rx_ring->q_vector->napi, ICE_RX_HDR_SIZE,

10
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -8047,10 +8047,7 @@ static struct sk_buff *igb_construct_skb(struct igb_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGB_RX_HDR_LEN);
@ -8104,10 +8101,7 @@ static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* build an skb around the page buffer */
skb = build_skb(va - IGB_SKB_PAD, truesize);

10
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -1550,10 +1550,7 @@ static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* build an skb around the page buffer */
skb = build_skb(va - IGC_SKB_PAD, truesize);
@ -1589,10 +1586,7 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
net_prefetch(va);
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGC_RX_HDR_LEN);

11
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -2095,10 +2095,8 @@ static struct sk_buff *ixgbe_construct_skb(struct ixgbe_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data);
/* Note, we get here by enabling legacy-rx via:
*
* ethtool --set-priv-flags <dev> legacy-rx on
@ -2161,10 +2159,7 @@ static struct sk_buff *ixgbe_build_skb(struct ixgbe_ring *rx_ring,
* likely have a consumer accessing first few bytes of meta
* data, and then actual data.
*/
prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data_meta + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data_meta);
/* build an skb to around the page buffer */
skb = build_skb(xdp->data_hard_start, truesize);

11
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -866,10 +866,8 @@ struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data);
/* Note, we get here by enabling legacy-rx via:
*
* ethtool --set-priv-flags <dev> legacy-rx on
@ -947,10 +945,7 @@ static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
* have a consumer accessing first few bytes of meta data,
* and then actual data.
*/
prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data_meta + L1_CACHE_BYTES);
#endif
net_prefetch(xdp->data_meta);
/* build an skb around the page buffer */
skb = build_skb(xdp->data_hard_start, truesize);

16
include/linux/netdevice.h
View File

@ -2193,6 +2193,22 @@ int netdev_get_num_tc(struct net_device *dev)
return dev->num_tc;
}
static inline void net_prefetch(void *p)
{
prefetch(p);
#if L1_CACHE_BYTES < 128
prefetch((u8 *)p + L1_CACHE_BYTES);
#endif
}
static inline void net_prefetchw(void *p)
{
prefetchw(p);
#if L1_CACHE_BYTES < 128
prefetchw((u8 *)p + L1_CACHE_BYTES);
#endif
}
void netdev_unbind_sb_channel(struct net_device *dev,
struct net_device *sb_dev);
int netdev_bind_sb_channel_queue(struct net_device *dev,