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Code Issues Releases Wiki Activity

net: Take common prefetch code structure into a function

Browse source 
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
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5
drivers/net/ethernet/chelsio/cxgb3/sge.c
View file

@ -2372,10 +2372,7 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs,
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,