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ice: introduce legacy Rx flag

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Add an ethtool "legacy-rx" priv flag for toggling the Rx path. This
control knob will be mainly used for build_skb usage as well as buffer
size/MTU manipulation.

In preparation for adding build_skb support in a way that it takes
care of how we set the values of max_frame and rx_buf_len fields of
struct ice_vsi. Specifically, in this patch mentioned fields are set to
values that will allow us to provide headroom and tailroom in-place.

This can be mostly broken down onto following:
- for legacy-rx "on" ethtool control knob, old behaviour is kept;
- for standard 1500 MTU size configure the buffer of size 1536, as
  network stack is expecting the NET_SKB_PAD to be provided and
  NET_IP_ALIGN can have a non-zero value (these can be typically equal
  to 32 and 2, respectively);
- for larger MTUs go with max_frame set to 9k and configure the 3k
  buffer in case when PAGE_SIZE of underlying arch is less than 8k; 3k
  buffer is implying the need for order 1 page, so that our page
  recycling scheme can still be applied;

With that said, substitute the hardcoded ICE_RXBUF_2048 and PAGE_SIZE
values in DMA API that we're making use of with rx_ring->rx_buf_len and
ice_rx_pg_size(rx_ring). The latter is an introduced helper for
determining the page size based on its order (which was figured out via
ice_rx_pg_order). Last but not least, take care of truesize calculation.

In the followup patch the headroom/tailroom computation logic will be
introduced.

This change aligns the buffer and frame configuration with other Intel
drivers, most importantly with iavf.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Maciej Fijalkowski 2019-10-24 01:11:22 -07:00 committed by Jeff Kirsher
parent 2d4238f556
commit 7237f5b0db
5 changed files with 63 additions and 25 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/net/ethernet/intel/ice/ice.h
View file

@ -331,6 +331,7 @@ enum ice_pf_flags {
ICE_FLAG_NO_MEDIA,
ICE_FLAG_FW_LLDP_AGENT,
ICE_FLAG_ETHTOOL_CTXT, /* set when ethtool holds RTNL lock */
ICE_FLAG_LEGACY_RX,
ICE_PF_FLAGS_NBITS /* must be last */
};

6
drivers/net/ethernet/intel/ice/ice_ethtool.c
View file

@ -156,6 +156,7 @@ struct ice_priv_flag {
static const struct ice_priv_flag ice_gstrings_priv_flags[] = {
ICE_PRIV_FLAG("link-down-on-close", ICE_FLAG_LINK_DOWN_ON_CLOSE_ENA),
ICE_PRIV_FLAG("fw-lldp-agent", ICE_FLAG_FW_LLDP_AGENT),
ICE_PRIV_FLAG("legacy-rx", ICE_FLAG_LEGACY_RX),
};
#define ICE_PRIV_FLAG_ARRAY_SIZE ARRAY_SIZE(ice_gstrings_priv_flags)
@ -1256,6 +1257,11 @@ static int ice_set_priv_flags(struct net_device *netdev, u32 flags)
"Fail to enable MIB change events\n");
}
}
if (test_bit(ICE_FLAG_LEGACY_RX, change_flags)) {
/* down and up VSI so that changes of Rx cfg are reflected. */
ice_down(vsi);
ice_up(vsi);
}
clear_bit(ICE_FLAG_ETHTOOL_CTXT, pf->flags);
return ret;
}

22
drivers/net/ethernet/intel/ice/ice_lib.c
View file

@ -1190,12 +1190,22 @@ int ice_vsi_kill_vlan(struct ice_vsi *vsi, u16 vid)
*/
void ice_vsi_cfg_frame_size(struct ice_vsi *vsi)
{
if (vsi->netdev && vsi->netdev->mtu > ETH_DATA_LEN)
vsi->max_frame = vsi->netdev->mtu + ICE_ETH_PKT_HDR_PAD;
else
vsi->max_frame = ICE_RXBUF_2048;
vsi->rx_buf_len = ICE_RXBUF_2048;
if (!vsi->netdev || test_bit(ICE_FLAG_LEGACY_RX, vsi->back->flags)) {
vsi->max_frame = ICE_AQ_SET_MAC_FRAME_SIZE_MAX;
vsi->rx_buf_len = ICE_RXBUF_2048;
#if (PAGE_SIZE < 8192)
} else if (vsi->netdev->mtu <= ETH_DATA_LEN) {
vsi->max_frame = ICE_RXBUF_1536 - NET_IP_ALIGN;
vsi->rx_buf_len = ICE_RXBUF_1536 - NET_IP_ALIGN;
#endif
} else {
vsi->max_frame = ICE_AQ_SET_MAC_FRAME_SIZE_MAX;
#if (PAGE_SIZE < 8192)
vsi->rx_buf_len = ICE_RXBUF_3072;
#else
vsi->rx_buf_len = ICE_RXBUF_2048;
#endif
}
}
/**

46
drivers/net/ethernet/intel/ice/ice_txrx.c
View file

@ -310,10 +310,11 @@ void ice_clean_rx_ring(struct ice_ring *rx_ring)
*/
dma_sync_single_range_for_cpu(dev, rx_buf->dma,
rx_buf->page_offset,
ICE_RXBUF_2048, DMA_FROM_DEVICE);
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
/* free resources associated with mapping */
dma_unmap_page_attrs(dev, rx_buf->dma, PAGE_SIZE,
dma_unmap_page_attrs(dev, rx_buf->dma, ice_rx_pg_size(rx_ring),
DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
__page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
@ -529,21 +530,21 @@ ice_alloc_mapped_page(struct ice_ring *rx_ring, struct ice_rx_buf *bi)
}
/* alloc new page for storage */
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
page = dev_alloc_pages(ice_rx_pg_order(rx_ring));
if (unlikely(!page)) {
rx_ring->rx_stats.alloc_page_failed++;
return false;
}
/* map page for use */
dma = dma_map_page_attrs(rx_ring->dev, page, 0, PAGE_SIZE,
dma = dma_map_page_attrs(rx_ring->dev, page, 0, ice_rx_pg_size(rx_ring),
DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
/* if mapping failed free memory back to system since
* there isn't much point in holding memory we can't use
*/
if (dma_mapping_error(rx_ring->dev, dma)) {
__free_pages(page, 0);
__free_pages(page, ice_rx_pg_order(rx_ring));
rx_ring->rx_stats.alloc_page_failed++;
return false;
}
@ -592,7 +593,7 @@ bool ice_alloc_rx_bufs(struct ice_ring *rx_ring, u16 cleaned_count)
/* sync the buffer for use by the device */
dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
bi->page_offset,
ICE_RXBUF_2048,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
/* Refresh the desc even if buffer_addrs didn't change
@ -663,9 +664,6 @@ ice_rx_buf_adjust_pg_offset(struct ice_rx_buf *rx_buf, unsigned int size)
*/
static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf)
{
#if (PAGE_SIZE >= 8192)
unsigned int last_offset = PAGE_SIZE - ICE_RXBUF_2048;
#endif
unsigned int pagecnt_bias = rx_buf->pagecnt_bias;
struct page *page = rx_buf->page;
@ -678,7 +676,9 @@ static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf)
if (unlikely((page_count(page) - pagecnt_bias) > 1))
return false;
#else
if (rx_buf->page_offset > last_offset)
#define ICE_LAST_OFFSET \
(SKB_WITH_OVERHEAD(PAGE_SIZE) - ICE_RXBUF_2048)
if (rx_buf->page_offset > ICE_LAST_OFFSET)
return false;
#endif /* PAGE_SIZE < 8192) */
@ -696,6 +696,7 @@ static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf)
/**
* ice_add_rx_frag - Add contents of Rx buffer to sk_buff as a frag
* @rx_ring: Rx descriptor ring to transact packets on
* @rx_buf: buffer containing page to add
* @skb: sk_buff to place the data into
* @size: packet length from rx_desc
@ -705,13 +706,13 @@ static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf)
* The function will then update the page offset.
*/
static void
ice_add_rx_frag(struct ice_rx_buf *rx_buf, struct sk_buff *skb,
unsigned int size)
ice_add_rx_frag(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
struct sk_buff *skb, unsigned int size)
{
#if (PAGE_SIZE >= 8192)
unsigned int truesize = SKB_DATA_ALIGN(size);
#else
unsigned int truesize = ICE_RXBUF_2048;
unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
#endif
if (!size)
@ -830,7 +831,7 @@ ice_construct_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
#if (PAGE_SIZE >= 8192)
unsigned int truesize = SKB_DATA_ALIGN(size);
#else
unsigned int truesize = ICE_RXBUF_2048;
unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
#endif
skb_add_rx_frag(skb, 0, rx_buf->page,
rx_buf->page_offset + headlen, size, truesize);
@ -873,8 +874,9 @@ static void ice_put_rx_buf(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf)
rx_ring->rx_stats.page_reuse_count++;
} else {
/* we are not reusing the buffer so unmap it */
dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma, PAGE_SIZE,
DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma,
ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE,
ICE_RX_DMA_ATTR);
__page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
}
@ -1008,9 +1010,15 @@ static int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
rcu_read_unlock();
if (xdp_res) {
if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR)) {
unsigned int truesize;
#if (PAGE_SIZE < 8192)
truesize = ice_rx_pg_size(rx_ring) / 2;
#else
truesize = SKB_DATA_ALIGN(size);
#endif
xdp_xmit |= xdp_res;
ice_rx_buf_adjust_pg_offset(rx_buf,
ICE_RXBUF_2048);
ice_rx_buf_adjust_pg_offset(rx_buf, truesize);
} else {
rx_buf->pagecnt_bias++;
}
@ -1023,7 +1031,7 @@ static int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
}
construct_skb:
if (skb)
ice_add_rx_frag(rx_buf, skb, size);
ice_add_rx_frag(rx_ring, rx_buf, skb, size);
else
skb = ice_construct_skb(rx_ring, rx_buf, &xdp);

13
drivers/net/ethernet/intel/ice/ice_txrx.h
View file

@ -7,7 +7,9 @@
#include "ice_type.h"
#define ICE_DFLT_IRQ_WORK 256
#define ICE_RXBUF_3072 3072
#define ICE_RXBUF_2048 2048
#define ICE_RXBUF_1536 1536
#define ICE_MAX_CHAINED_RX_BUFS 5
#define ICE_MAX_BUF_TXD 8
#define ICE_MIN_TX_LEN 17
@ -262,6 +264,17 @@ struct ice_ring_container {
#define ice_for_each_ring(pos, head) \
for (pos = (head).ring; pos; pos = pos->next)
static inline unsigned int ice_rx_pg_order(struct ice_ring *ring)
{
#if (PAGE_SIZE < 8192)
if (ring->rx_buf_len > (PAGE_SIZE / 2))
return 1;
#endif
return 0;
}
#define ice_rx_pg_size(_ring) (PAGE_SIZE << ice_rx_pg_order(_ring))
union ice_32b_rx_flex_desc;
bool ice_alloc_rx_bufs(struct ice_ring *rxr, u16 cleaned_count);