diff options
Diffstat (limited to 'drivers/net/ethernet/intel/igc/igc.h')
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index e595d135ea7b..7bb19328b899 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -46,6 +46,45 @@ extern char igc_driver_version[]; #define MAX_Q_VECTORS 8 #define MAX_STD_JUMBO_FRAME_SIZE 9216 +/* Supported Rx Buffer Sizes */ +#define IGC_RXBUFFER_256 256 +#define IGC_RXBUFFER_2048 2048 +#define IGC_RXBUFFER_3072 3072 + +#define IGC_RX_HDR_LEN IGC_RXBUFFER_256 + +/* RX and TX descriptor control thresholds. + * PTHRESH - MAC will consider prefetch if it has fewer than this number of + * descriptors available in its onboard memory. + * Setting this to 0 disables RX descriptor prefetch. + * HTHRESH - MAC will only prefetch if there are at least this many descriptors + * available in host memory. + * If PTHRESH is 0, this should also be 0. + * WTHRESH - RX descriptor writeback threshold - MAC will delay writing back + * descriptors until either it has this many to write back, or the + * ITR timer expires. + */ +#define IGC_RX_PTHRESH 8 +#define IGC_RX_HTHRESH 8 +#define IGC_TX_PTHRESH 8 +#define IGC_TX_HTHRESH 1 +#define IGC_RX_WTHRESH 4 +#define IGC_TX_WTHRESH 16 + +#define IGC_RX_DMA_ATTR \ + (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING) + +#define IGC_TS_HDR_LEN 16 + +#define IGC_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN) + +#if (PAGE_SIZE < 8192) +#define IGC_MAX_FRAME_BUILD_SKB \ + (SKB_WITH_OVERHEAD(IGC_RXBUFFER_2048) - IGC_SKB_PAD - IGC_TS_HDR_LEN) +#else +#define IGC_MAX_FRAME_BUILD_SKB (IGC_RXBUFFER_2048 - IGC_TS_HDR_LEN) +#endif + enum igc_state_t { __IGC_TESTING, __IGC_RESETTING, @@ -53,6 +92,33 @@ enum igc_state_t { __IGC_PTP_TX_IN_PROGRESS, }; +/* wrapper around a pointer to a socket buffer, + * so a DMA handle can be stored along with the buffer + */ +struct igc_tx_buffer { + union igc_adv_tx_desc *next_to_watch; + unsigned long time_stamp; + struct sk_buff *skb; + unsigned int bytecount; + u16 gso_segs; + __be16 protocol; + + DEFINE_DMA_UNMAP_ADDR(dma); + DEFINE_DMA_UNMAP_LEN(len); + u32 tx_flags; +}; + +struct igc_rx_buffer { + dma_addr_t dma; + struct page *page; +#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) + __u32 page_offset; +#else + __u16 page_offset; +#endif + __u16 pagecnt_bias; +}; + struct igc_tx_queue_stats { u64 packets; u64 bytes; @@ -214,4 +280,63 @@ struct igc_adapter { struct igc_mac_addr *mac_table; }; +/* igc_desc_unused - calculate if we have unused descriptors */ +static inline u16 igc_desc_unused(const struct igc_ring *ring) +{ + u16 ntc = ring->next_to_clean; + u16 ntu = ring->next_to_use; + + return ((ntc > ntu) ? 0 : ring->count) + ntc - ntu - 1; +} + +static inline struct netdev_queue *txring_txq(const struct igc_ring *tx_ring) +{ + return netdev_get_tx_queue(tx_ring->netdev, tx_ring->queue_index); +} + +enum igc_ring_flags_t { + IGC_RING_FLAG_RX_3K_BUFFER, + IGC_RING_FLAG_RX_BUILD_SKB_ENABLED, + IGC_RING_FLAG_RX_SCTP_CSUM, + IGC_RING_FLAG_RX_LB_VLAN_BSWAP, + IGC_RING_FLAG_TX_CTX_IDX, + IGC_RING_FLAG_TX_DETECT_HANG +}; + +#define ring_uses_large_buffer(ring) \ + test_bit(IGC_RING_FLAG_RX_3K_BUFFER, &(ring)->flags) + +#define ring_uses_build_skb(ring) \ + test_bit(IGC_RING_FLAG_RX_BUILD_SKB_ENABLED, &(ring)->flags) + +static inline unsigned int igc_rx_bufsz(struct igc_ring *ring) +{ +#if (PAGE_SIZE < 8192) + if (ring_uses_large_buffer(ring)) + return IGC_RXBUFFER_3072; + + if (ring_uses_build_skb(ring)) + return IGC_MAX_FRAME_BUILD_SKB + IGC_TS_HDR_LEN; +#endif + return IGC_RXBUFFER_2048; +} + +static inline unsigned int igc_rx_pg_order(struct igc_ring *ring) +{ +#if (PAGE_SIZE < 8192) + if (ring_uses_large_buffer(ring)) + return 1; +#endif + return 0; +} + +#define igc_rx_pg_size(_ring) (PAGE_SIZE << igc_rx_pg_order(_ring)) + +#define IGC_RX_DESC(R, i) \ + (&(((union igc_adv_rx_desc *)((R)->desc))[i])) +#define IGC_TX_DESC(R, i) \ + (&(((union igc_adv_tx_desc *)((R)->desc))[i])) +#define IGC_TX_CTXTDESC(R, i) \ + (&(((struct igc_adv_tx_context_desc *)((R)->desc))[i])) + #endif /* _IGC_H_ */ |