[Intel-wired-lan] [PATCH 3/9] ixgbevf: add support for using order 1 pages to receive large frames
Emil Tantilov
emil.s.tantilov at intel.com
Wed Jan 31 00:51:22 UTC 2018
Based on commit 8649aaef4044
("igb: Add support for using order 1 pages to receive large frames")
Add support for using 3K buffers in order 1 page. We are reserving 1K for
now to have space available for future tailroom and headroom when we enable
build_skb support.
Signed-off-by: Emil Tantilov <emil.s.tantilov at intel.com>
---
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 52 ++++++++++++++---
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 64 ++++++++++++++++-----
2 files changed, 92 insertions(+), 24 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index 62a3669..d691d64 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -89,17 +89,11 @@ struct ixgbevf_rx_queue_stats {
};
enum ixgbevf_ring_state_t {
+ __IXGBEVF_RX_3K_BUFFER,
__IXGBEVF_TX_DETECT_HANG,
__IXGBEVF_HANG_CHECK_ARMED,
};
-#define check_for_tx_hang(ring) \
- test_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
-#define set_check_for_tx_hang(ring) \
- set_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
-#define clear_check_for_tx_hang(ring) \
- clear_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
-
struct ixgbevf_ring {
struct ixgbevf_ring *next;
struct net_device *netdev;
@@ -156,12 +150,20 @@ struct ixgbevf_ring {
/* Supported Rx Buffer Sizes */
#define IXGBEVF_RXBUFFER_256 256 /* Used for packet split */
#define IXGBEVF_RXBUFFER_2048 2048
+#define IXGBEVF_RXBUFFER_3072 3072
#define IXGBEVF_RX_HDR_SIZE IXGBEVF_RXBUFFER_256
-#define IXGBEVF_RX_BUFSZ IXGBEVF_RXBUFFER_2048
#define MAXIMUM_ETHERNET_VLAN_SIZE (VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)
+#define IXGBEVF_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
+#if (PAGE_SIZE < 8192)
+#define IXGBEVF_MAX_FRAME_BUILD_SKB \
+ (SKB_WITH_OVERHEAD(IXGBEVF_RXBUFFER_2048) - IXGBEVF_SKB_PAD)
+#else
+#define IXGBEVF_MAX_FRAME_BUILD_SKB IXGBEVF_RXBUFFER_2048
+#endif
+
#define IXGBE_TX_FLAGS_CSUM BIT(0)
#define IXGBE_TX_FLAGS_VLAN BIT(1)
#define IXGBE_TX_FLAGS_TSO BIT(2)
@@ -170,6 +172,40 @@ struct ixgbevf_ring {
#define IXGBE_TX_FLAGS_VLAN_PRIO_MASK 0x0000e000
#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
+#define ring_uses_large_buffer(ring) \
+ test_bit(__IXGBEVF_RX_3K_BUFFER, &(ring)->state)
+#define set_ring_uses_large_buffer(ring) \
+ set_bit(__IXGBEVF_RX_3K_BUFFER, &(ring)->state)
+#define clear_ring_uses_large_buffer(ring) \
+ clear_bit(__IXGBEVF_RX_3K_BUFFER, &(ring)->state)
+
+static inline unsigned int ixgbevf_rx_bufsz(struct ixgbevf_ring *ring)
+{
+#if (PAGE_SIZE < 8192)
+ if (ring_uses_large_buffer(ring))
+ return IXGBEVF_RXBUFFER_3072;
+#endif
+ return IXGBEVF_RXBUFFER_2048;
+}
+
+static inline unsigned int ixgbevf_rx_pg_order(struct ixgbevf_ring *ring)
+{
+#if (PAGE_SIZE < 8192)
+ if (ring_uses_large_buffer(ring))
+ return 1;
+#endif
+ return 0;
+}
+
+#define ixgbevf_rx_pg_size(_ring) (PAGE_SIZE << ixgbevf_rx_pg_order(_ring))
+
+#define check_for_tx_hang(ring) \
+ test_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
+#define set_check_for_tx_hang(ring) \
+ set_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
+#define clear_check_for_tx_hang(ring) \
+ clear_bit(__IXGBEVF_TX_DETECT_HANG, &(ring)->state)
+
struct ixgbevf_ring_container {
struct ixgbevf_ring *ring; /* pointer to linked list of rings */
unsigned int total_bytes; /* total bytes processed this int */
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 604b026..f8e1b1c 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -565,21 +565,22 @@ static bool ixgbevf_alloc_mapped_page(struct ixgbevf_ring *rx_ring,
return true;
/* alloc new page for storage */
- page = dev_alloc_page();
+ page = dev_alloc_pages(ixgbevf_rx_pg_order(rx_ring));
if (unlikely(!page)) {
rx_ring->rx_stats.alloc_rx_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,
+ ixgbevf_rx_pg_size(rx_ring),
DMA_FROM_DEVICE, IXGBEVF_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_page(page);
+ __free_pages(page, ixgbevf_rx_pg_order(rx_ring));
rx_ring->rx_stats.alloc_rx_page_failed++;
return false;
@@ -621,7 +622,7 @@ static void ixgbevf_alloc_rx_buffers(struct ixgbevf_ring *rx_ring,
/* sync the buffer for use by the device */
dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
bi->page_offset,
- IXGBEVF_RX_BUFSZ,
+ ixgbevf_rx_bufsz(rx_ring),
DMA_FROM_DEVICE);
/* Refresh the desc even if pkt_addr didn't change
@@ -750,13 +751,16 @@ static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer,
return false;
/* flip page offset to other buffer */
- rx_buffer->page_offset ^= IXGBEVF_RX_BUFSZ;
+ rx_buffer->page_offset ^= truesize;
#else
/* move offset up to the next cache line */
rx_buffer->page_offset += truesize;
- if (rx_buffer->page_offset > (PAGE_SIZE - IXGBEVF_RX_BUFSZ))
+#define IXGBEVF_LAST_OFFSET \
+ (SKB_WITH_OVERHEAD(PAGE_SIZE) - IXGBEVF_RXBUFFER_2048)
+
+ if (rx_buffer->page_offset > IXGBEVF_LAST_OFFSET)
return false;
#endif
@@ -797,7 +801,7 @@ static bool ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring,
struct page *page = rx_buffer->page;
void *va = page_address(page) + rx_buffer->page_offset;
#if (PAGE_SIZE < 8192)
- unsigned int truesize = IXGBEVF_RX_BUFSZ;
+ unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
#endif
@@ -888,8 +892,8 @@ static struct sk_buff *ixgbevf_fetch_rx_buffer(struct ixgbevf_ring *rx_ring,
* any references we are holding to it
*/
dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
- PAGE_SIZE, DMA_FROM_DEVICE,
- IXGBEVF_RX_DMA_ATTR);
+ ixgbevf_rx_pg_size(rx_ring),
+ DMA_FROM_DEVICE, IXGBEVF_RX_DMA_ATTR);
__page_frag_cache_drain(page, rx_buffer->pagecnt_bias);
}
@@ -1586,7 +1590,8 @@ static void ixgbevf_configure_tx(struct ixgbevf_adapter *adapter)
#define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2
-static void ixgbevf_configure_srrctl(struct ixgbevf_adapter *adapter, int index)
+static void ixgbevf_configure_srrctl(struct ixgbevf_adapter *adapter,
+ struct ixgbevf_ring *ring, int index)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 srrctl;
@@ -1594,7 +1599,10 @@ static void ixgbevf_configure_srrctl(struct ixgbevf_adapter *adapter, int index)
srrctl = IXGBE_SRRCTL_DROP_EN;
srrctl |= IXGBEVF_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
- srrctl |= IXGBEVF_RX_BUFSZ >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+ if (ring_uses_large_buffer(ring))
+ srrctl |= IXGBEVF_RXBUFFER_3072 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+ else
+ srrctl |= IXGBEVF_RXBUFFER_2048 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
IXGBE_WRITE_REG(hw, IXGBE_VFSRRCTL(index), srrctl);
@@ -1766,7 +1774,7 @@ static void ixgbevf_configure_rx_ring(struct ixgbevf_adapter *adapter,
ring->next_to_use = 0;
ring->next_to_alloc = 0;
- ixgbevf_configure_srrctl(adapter, reg_idx);
+ ixgbevf_configure_srrctl(adapter, ring, reg_idx);
/* allow any size packet since we can handle overflow */
rxdctl &= ~IXGBE_RXDCTL_RLPML_EN;
@@ -1778,6 +1786,26 @@ static void ixgbevf_configure_rx_ring(struct ixgbevf_adapter *adapter,
ixgbevf_alloc_rx_buffers(ring, ixgbevf_desc_unused(ring));
}
+static void ixgbevf_set_rx_buffer_len(struct ixgbevf_adapter *adapter,
+ struct ixgbevf_ring *rx_ring)
+{
+ struct net_device *netdev = adapter->netdev;
+ unsigned int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
+
+ /* set build_skb and buffer size flags */
+ clear_ring_uses_large_buffer(rx_ring);
+
+ if (adapter->flags & IXGBEVF_FLAGS_LEGACY_RX)
+ return;
+
+#if (PAGE_SIZE < 8192)
+ if (max_frame <= IXGBEVF_MAX_FRAME_BUILD_SKB)
+ return;
+
+ set_ring_uses_large_buffer(rx_ring);
+#endif
+}
+
/**
* ixgbevf_configure_rx - Configure 82599 VF Receive Unit after Reset
* @adapter: board private structure
@@ -1805,8 +1833,12 @@ static void ixgbevf_configure_rx(struct ixgbevf_adapter *adapter)
/* Setup the HW Rx Head and Tail Descriptor Pointers and
* the Base and Length of the Rx Descriptor Ring
*/
- for (i = 0; i < adapter->num_rx_queues; i++)
- ixgbevf_configure_rx_ring(adapter, adapter->rx_ring[i]);
+ for (i = 0; i < adapter->num_rx_queues; i++) {
+ struct ixgbevf_ring *rx_ring = adapter->rx_ring[i];
+
+ ixgbevf_set_rx_buffer_len(adapter, rx_ring);
+ ixgbevf_configure_rx_ring(adapter, rx_ring);
+ }
}
static int ixgbevf_vlan_rx_add_vid(struct net_device *netdev,
@@ -2135,13 +2167,13 @@ static void ixgbevf_clean_rx_ring(struct ixgbevf_ring *rx_ring)
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_buffer->dma,
rx_buffer->page_offset,
- IXGBEVF_RX_BUFSZ,
+ ixgbevf_rx_bufsz(rx_ring),
DMA_FROM_DEVICE);
/* free resources associated with mapping */
dma_unmap_page_attrs(rx_ring->dev,
rx_buffer->dma,
- PAGE_SIZE,
+ ixgbevf_rx_pg_size(rx_ring),
DMA_FROM_DEVICE,
IXGBEVF_RX_DMA_ATTR);
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