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ixgbe: Add support for padding packet 

This patch adds support for providing a buffer with headroom and tailroom
to allow for shared info, NET_SKB_PAD, and NET_IP_ALIGN.  With this
combined with the DMA changes we can start using build_skb to build frames
around an incoming Rx buffer instead of having to memcpy the headers.

Signed-off-by: Alexander Duyck <alexander.h.duyck@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:
Alexander Duyck 2017-01-17 08:36:54 -08:00 committed by Jeff Kirsher
parent 3fd218767f
commit 2de6aa3a66
2 changed files with 56 additions and 4 deletions
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17
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View File

@ -91,6 +91,14 @@
#define IXGBE_RXBUFFER_4K 4096
#define IXGBE_MAX_RXBUFFER 16384 /* largest size for a single descriptor */
#define IXGBE_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
#if (PAGE_SIZE < 8192)
#define IXGBE_MAX_FRAME_BUILD_SKB \
(SKB_WITH_OVERHEAD(IXGBE_RXBUFFER_2K) - IXGBE_SKB_PAD)
#else
#define IGB_MAX_FRAME_BUILD_SKB IXGBE_RXBUFFER_2K
#endif
/*
* NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN means we
* reserve 64 more, and skb_shared_info adds an additional 320 bytes more,
@ -227,6 +235,7 @@ struct ixgbe_rx_queue_stats {
enum ixgbe_ring_state_t {
__IXGBE_RX_3K_BUFFER,
__IXGBE_RX_BUILD_SKB_ENABLED,
__IXGBE_RX_RSC_ENABLED,
__IXGBE_RX_CSUM_UDP_ZERO_ERR,
__IXGBE_RX_FCOE,
@ -236,6 +245,9 @@ enum ixgbe_ring_state_t {
__IXGBE_HANG_CHECK_ARMED,
};
#define ring_uses_build_skb(ring) \
test_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &(ring)->state)
struct ixgbe_fwd_adapter {
unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
struct net_device *netdev;
@ -347,6 +359,10 @@ static inline unsigned int ixgbe_rx_bufsz(struct ixgbe_ring *ring)
{
if (test_bit(__IXGBE_RX_3K_BUFFER, &ring->state))
return IXGBE_RXBUFFER_3K;
#if (PAGE_SIZE < 8192)
if (ring_uses_build_skb(ring))
return IXGBE_MAX_FRAME_BUILD_SKB;
#endif
return IXGBE_RXBUFFER_2K;
}
@ -545,6 +561,7 @@ struct ixgbe_adapter {
#define IXGBE_FLAG2_VLAN_PROMISC BIT(13)
#define IXGBE_FLAG2_EEE_CAPABLE BIT(14)
#define IXGBE_FLAG2_EEE_ENABLED BIT(15)
#define IXGBE_FLAG2_RX_LEGACY BIT(16)
/* Tx fast path data */
int num_tx_queues;

43
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -1552,6 +1552,11 @@ static inline void ixgbe_rx_checksum(struct ixgbe_ring *ring,
}
}
static inline unsigned int ixgbe_rx_offset(struct ixgbe_ring *rx_ring)
{
return ring_uses_build_skb(rx_ring) ? IXGBE_SKB_PAD : 0;
}
static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi)
{
@ -1588,7 +1593,7 @@ static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
bi->dma = dma;
bi->page = page;
bi->page_offset = 0;
bi->page_offset = ixgbe_rx_offset(rx_ring);
bi->pagecnt_bias = 1;
return true;
@ -2001,7 +2006,9 @@ static void ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring,
#if (PAGE_SIZE < 8192)
unsigned int truesize = ixgbe_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = SKB_DATA_ALIGN(size);
unsigned int truesize = ring_uses_build_skb(rx_ring) ?
SKB_DATA_ALIGN(IXGBE_SKB_PAD + size) :
SKB_DATA_ALIGN(size);
#endif
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
rx_buffer->page_offset, size, truesize);
@ -2083,7 +2090,7 @@ static struct sk_buff *ixgbe_construct_skb(struct ixgbe_ring *rx_ring,
#if (PAGE_SIZE < 8192)
unsigned int truesize = ixgbe_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
unsigned int truesize = SKB_DATA_ALIGN(size);
#endif
struct sk_buff *skb;
@ -3410,7 +3417,10 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
srrctl = IXGBE_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
/* configure the packet buffer length */
srrctl |= ixgbe_rx_bufsz(rx_ring) >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
if (test_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state))
srrctl |= IXGBE_RXBUFFER_3K >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
else
srrctl |= IXGBE_RXBUFFER_2K >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
/* configure descriptor type */
srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
@ -3744,6 +3754,17 @@ void ixgbe_configure_rx_ring(struct ixgbe_adapter *adapter,
*/
rxdctl &= ~0x3FFFFF;
rxdctl |= 0x080420;
#if (PAGE_SIZE < 8192)
} else {
rxdctl &= ~(IXGBE_RXDCTL_RLPMLMASK |
IXGBE_RXDCTL_RLPML_EN);
/* Limit the maximum frame size so we don't overrun the skb */
if (ring_uses_build_skb(ring) &&
!test_bit(__IXGBE_RX_3K_BUFFER, &ring->state))
rxdctl |= IXGBE_MAX_FRAME_BUILD_SKB |
IXGBE_RXDCTL_RLPML_EN;
#endif
}
/* initialize Rx descriptor 0 */
@ -3889,12 +3910,26 @@ static void ixgbe_set_rx_buffer_len(struct ixgbe_adapter *adapter)
clear_ring_rsc_enabled(rx_ring);
clear_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state);
clear_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &rx_ring->state);
if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
set_ring_rsc_enabled(rx_ring);
if (test_bit(__IXGBE_RX_FCOE, &rx_ring->state))
set_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state);
if (adapter->flags2 & IXGBE_FLAG2_RX_LEGACY)
continue;
set_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &rx_ring->state);
#if (PAGE_SIZE < 8192)
if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
set_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state);
if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN))
set_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state);
#endif
}
}