diff options
Diffstat (limited to 'drivers/net/ethernet/intel/i40e/i40e_txrx.h')
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_txrx.h | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h new file mode 100644 index 00000000000..0277894fe1c --- /dev/null +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h @@ -0,0 +1,290 @@ +/******************************************************************************* + * + * Intel Ethernet Controller XL710 Family Linux Driver + * Copyright(c) 2013 - 2014 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program. If not, see <http://www.gnu.org/licenses/>. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Contact Information: + * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + ******************************************************************************/ + +#ifndef _I40E_TXRX_H_ +#define _I40E_TXRX_H_ + +/* Interrupt Throttling and Rate Limiting Goodies */ + +#define I40E_MAX_ITR 0x0FF0 /* reg uses 2 usec resolution */ +#define I40E_MIN_ITR 0x0004 /* reg uses 2 usec resolution */ +#define I40E_MAX_IRATE 0x03F +#define I40E_MIN_IRATE 0x001 +#define I40E_IRATE_USEC_RESOLUTION 4 +#define I40E_ITR_100K 0x0005 +#define I40E_ITR_20K 0x0019 +#define I40E_ITR_8K 0x003E +#define I40E_ITR_4K 0x007A +#define I40E_ITR_RX_DEF I40E_ITR_8K +#define I40E_ITR_TX_DEF I40E_ITR_4K +#define I40E_ITR_DYNAMIC 0x8000 /* use top bit as a flag */ +#define I40E_MIN_INT_RATE 250 /* ~= 1000000 / (I40E_MAX_ITR * 2) */ +#define I40E_MAX_INT_RATE 500000 /* == 1000000 / (I40E_MIN_ITR * 2) */ +#define I40E_DEFAULT_IRQ_WORK 256 +#define ITR_TO_REG(setting) ((setting & ~I40E_ITR_DYNAMIC) >> 1) +#define ITR_IS_DYNAMIC(setting) (!!(setting & I40E_ITR_DYNAMIC)) +#define ITR_REG_TO_USEC(itr_reg) (itr_reg << 1) + +#define I40E_QUEUE_END_OF_LIST 0x7FF + +/* this enum matches hardware bits and is meant to be used by DYN_CTLN + * registers and QINT registers or more generally anywhere in the manual + * mentioning ITR_INDX, ITR_NONE cannot be used as an index 'n' into any + * register but instead is a special value meaning "don't update" ITR0/1/2. + */ +enum i40e_dyn_idx_t { + I40E_IDX_ITR0 = 0, + I40E_IDX_ITR1 = 1, + I40E_IDX_ITR2 = 2, + I40E_ITR_NONE = 3 /* ITR_NONE must not be used as an index */ +}; + +/* these are indexes into ITRN registers */ +#define I40E_RX_ITR I40E_IDX_ITR0 +#define I40E_TX_ITR I40E_IDX_ITR1 +#define I40E_PE_ITR I40E_IDX_ITR2 + +/* Supported RSS offloads */ +#define I40E_DEFAULT_RSS_HENA ( \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_UDP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_SCTP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_TCP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_OTHER) | \ + ((u64)1 << I40E_FILTER_PCTYPE_FRAG_IPV4) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_UDP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_TCP_SYN) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_TCP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_SCTP) | \ + ((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_OTHER) | \ + ((u64)1 << I40E_FILTER_PCTYPE_FRAG_IPV6) | \ + ((u64)1 << I40E_FILTER_PCTYPE_L2_PAYLOAD)) + +/* Supported Rx Buffer Sizes */ +#define I40E_RXBUFFER_512 512 /* Used for packet split */ +#define I40E_RXBUFFER_2048 2048 +#define I40E_RXBUFFER_3072 3072 /* For FCoE MTU of 2158 */ +#define I40E_RXBUFFER_4096 4096 +#define I40E_RXBUFFER_8192 8192 +#define I40E_MAX_RXBUFFER 9728 /* largest size for single descriptor */ + +/* NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN means we + * reserve 2 more, and skb_shared_info adds an additional 384 bytes more, + * this adds up to 512 bytes of extra data meaning the smallest allocation + * we could have is 1K. + * i.e. RXBUFFER_512 --> size-1024 slab + */ +#define I40E_RX_HDR_SIZE I40E_RXBUFFER_512 + +/* How many Rx Buffers do we bundle into one write to the hardware ? */ +#define I40E_RX_BUFFER_WRITE 16 /* Must be power of 2 */ +#define I40E_RX_NEXT_DESC(r, i, n) \ + do { \ + (i)++; \ + if ((i) == (r)->count) \ + i = 0; \ + (n) = I40E_RX_DESC((r), (i)); \ + } while (0) + +#define I40E_RX_NEXT_DESC_PREFETCH(r, i, n) \ + do { \ + I40E_RX_NEXT_DESC((r), (i), (n)); \ + prefetch((n)); \ + } while (0) + +#define i40e_rx_desc i40e_32byte_rx_desc + +#define I40E_MIN_TX_LEN 17 +#define I40E_MAX_DATA_PER_TXD 8192 + +/* Tx Descriptors needed, worst case */ +#define TXD_USE_COUNT(S) DIV_ROUND_UP((S), I40E_MAX_DATA_PER_TXD) +#define DESC_NEEDED (MAX_SKB_FRAGS + 4) + +#define I40E_TX_FLAGS_CSUM (u32)(1) +#define I40E_TX_FLAGS_HW_VLAN (u32)(1 << 1) +#define I40E_TX_FLAGS_SW_VLAN (u32)(1 << 2) +#define I40E_TX_FLAGS_TSO (u32)(1 << 3) +#define I40E_TX_FLAGS_IPV4 (u32)(1 << 4) +#define I40E_TX_FLAGS_IPV6 (u32)(1 << 5) +#define I40E_TX_FLAGS_FCCRC (u32)(1 << 6) +#define I40E_TX_FLAGS_FSO (u32)(1 << 7) +#define I40E_TX_FLAGS_TSYN (u32)(1 << 8) +#define I40E_TX_FLAGS_VLAN_MASK 0xffff0000 +#define I40E_TX_FLAGS_VLAN_PRIO_MASK 0xe0000000 +#define I40E_TX_FLAGS_VLAN_PRIO_SHIFT 29 +#define I40E_TX_FLAGS_VLAN_SHIFT 16 + +struct i40e_tx_buffer { + struct i40e_tx_desc *next_to_watch; + unsigned long time_stamp; + struct sk_buff *skb; + unsigned int bytecount; + unsigned short gso_segs; + DEFINE_DMA_UNMAP_ADDR(dma); + DEFINE_DMA_UNMAP_LEN(len); + u32 tx_flags; +}; + +struct i40e_rx_buffer { + struct sk_buff *skb; + dma_addr_t dma; + struct page *page; + dma_addr_t page_dma; + unsigned int page_offset; +}; + +struct i40e_queue_stats { + u64 packets; + u64 bytes; +}; + +struct i40e_tx_queue_stats { + u64 restart_queue; + u64 tx_busy; + u64 tx_done_old; +}; + +struct i40e_rx_queue_stats { + u64 non_eop_descs; + u64 alloc_page_failed; + u64 alloc_buff_failed; +}; + +enum i40e_ring_state_t { + __I40E_TX_FDIR_INIT_DONE, + __I40E_TX_XPS_INIT_DONE, + __I40E_TX_DETECT_HANG, + __I40E_HANG_CHECK_ARMED, + __I40E_RX_PS_ENABLED, + __I40E_RX_16BYTE_DESC_ENABLED, +}; + +#define ring_is_ps_enabled(ring) \ + test_bit(__I40E_RX_PS_ENABLED, &(ring)->state) +#define set_ring_ps_enabled(ring) \ + set_bit(__I40E_RX_PS_ENABLED, &(ring)->state) +#define clear_ring_ps_enabled(ring) \ + clear_bit(__I40E_RX_PS_ENABLED, &(ring)->state) +#define check_for_tx_hang(ring) \ + test_bit(__I40E_TX_DETECT_HANG, &(ring)->state) +#define set_check_for_tx_hang(ring) \ + set_bit(__I40E_TX_DETECT_HANG, &(ring)->state) +#define clear_check_for_tx_hang(ring) \ + clear_bit(__I40E_TX_DETECT_HANG, &(ring)->state) +#define ring_is_16byte_desc_enabled(ring) \ + test_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state) +#define set_ring_16byte_desc_enabled(ring) \ + set_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state) +#define clear_ring_16byte_desc_enabled(ring) \ + clear_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state) + +/* struct that defines a descriptor ring, associated with a VSI */ +struct i40e_ring { + struct i40e_ring *next; /* pointer to next ring in q_vector */ + void *desc; /* Descriptor ring memory */ + struct device *dev; /* Used for DMA mapping */ + struct net_device *netdev; /* netdev ring maps to */ + union { + struct i40e_tx_buffer *tx_bi; + struct i40e_rx_buffer *rx_bi; + }; + unsigned long state; + u16 queue_index; /* Queue number of ring */ + u8 dcb_tc; /* Traffic class of ring */ + u8 __iomem *tail; + + u16 count; /* Number of descriptors */ + u16 reg_idx; /* HW register index of the ring */ + u16 rx_hdr_len; + u16 rx_buf_len; + u8 dtype; +#define I40E_RX_DTYPE_NO_SPLIT 0 +#define I40E_RX_DTYPE_SPLIT_ALWAYS 1 +#define I40E_RX_DTYPE_HEADER_SPLIT 2 + u8 hsplit; +#define I40E_RX_SPLIT_L2 0x1 +#define I40E_RX_SPLIT_IP 0x2 +#define I40E_RX_SPLIT_TCP_UDP 0x4 +#define I40E_RX_SPLIT_SCTP 0x8 + + /* used in interrupt processing */ + u16 next_to_use; + u16 next_to_clean; + + u8 atr_sample_rate; + u8 atr_count; + + unsigned long last_rx_timestamp; + + bool ring_active; /* is ring online or not */ + + /* stats structs */ + struct i40e_queue_stats stats; + struct u64_stats_sync syncp; + union { + struct i40e_tx_queue_stats tx_stats; + struct i40e_rx_queue_stats rx_stats; + }; + + unsigned int size; /* length of descriptor ring in bytes */ + dma_addr_t dma; /* physical address of ring */ + + struct i40e_vsi *vsi; /* Backreference to associated VSI */ + struct i40e_q_vector *q_vector; /* Backreference to associated vector */ + + struct rcu_head rcu; /* to avoid race on free */ +} ____cacheline_internodealigned_in_smp; + +enum i40e_latency_range { + I40E_LOWEST_LATENCY = 0, + I40E_LOW_LATENCY = 1, + I40E_BULK_LATENCY = 2, +}; + +struct i40e_ring_container { + /* array of pointers to rings */ + struct i40e_ring *ring; + unsigned int total_bytes; /* total bytes processed this int */ + unsigned int total_packets; /* total packets processed this int */ + u16 count; + enum i40e_latency_range latency_range; + u16 itr; +}; + +/* iterator for handling rings in ring container */ +#define i40e_for_each_ring(pos, head) \ + for (pos = (head).ring; pos != NULL; pos = pos->next) + +void i40e_alloc_rx_buffers(struct i40e_ring *rxr, u16 cleaned_count); +netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev); +void i40e_clean_tx_ring(struct i40e_ring *tx_ring); +void i40e_clean_rx_ring(struct i40e_ring *rx_ring); +int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring); +int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring); +void i40e_free_tx_resources(struct i40e_ring *tx_ring); +void i40e_free_rx_resources(struct i40e_ring *rx_ring); +int i40e_napi_poll(struct napi_struct *napi, int budget); +#endif /* _I40E_TXRX_H_ */ |