diff options
Diffstat (limited to 'drivers/net/ethernet/amazon/ena/ena_netdev.h')
-rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_netdev.h | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h new file mode 100644 index 000000000..2cb141079 --- /dev/null +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h @@ -0,0 +1,453 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved. + */ + +#ifndef ENA_H +#define ENA_H + +#include <linux/bitops.h> +#include <linux/dim.h> +#include <linux/etherdevice.h> +#include <linux/if_vlan.h> +#include <linux/inetdevice.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <uapi/linux/bpf.h> + +#include "ena_com.h" +#include "ena_eth_com.h" + +#define DRV_MODULE_GEN_MAJOR 2 +#define DRV_MODULE_GEN_MINOR 1 +#define DRV_MODULE_GEN_SUBMINOR 0 + +#define DRV_MODULE_NAME "ena" + +#define DEVICE_NAME "Elastic Network Adapter (ENA)" + +/* 1 for AENQ + ADMIN */ +#define ENA_ADMIN_MSIX_VEC 1 +#define ENA_MAX_MSIX_VEC(io_queues) (ENA_ADMIN_MSIX_VEC + (io_queues)) + +/* The ENA buffer length fields is 16 bit long. So when PAGE_SIZE == 64kB the + * driver passes 0. + * Since the max packet size the ENA handles is ~9kB limit the buffer length to + * 16kB. + */ +#if PAGE_SIZE > SZ_16K +#define ENA_PAGE_SIZE (_AC(SZ_16K, UL)) +#else +#define ENA_PAGE_SIZE PAGE_SIZE +#endif + +#define ENA_MIN_MSIX_VEC 2 + +#define ENA_REG_BAR 0 +#define ENA_MEM_BAR 2 +#define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR)) + +#define ENA_DEFAULT_RING_SIZE (1024) +#define ENA_MIN_RING_SIZE (256) + +#define ENA_MIN_NUM_IO_QUEUES (1) + +#define ENA_TX_WAKEUP_THRESH (MAX_SKB_FRAGS + 2) +#define ENA_DEFAULT_RX_COPYBREAK (256 - NET_IP_ALIGN) + +#define ENA_MIN_MTU 128 + +#define ENA_NAME_MAX_LEN 20 +#define ENA_IRQNAME_SIZE 40 + +#define ENA_PKT_MAX_BUFS 19 + +#define ENA_RX_RSS_TABLE_LOG_SIZE 7 +#define ENA_RX_RSS_TABLE_SIZE (1 << ENA_RX_RSS_TABLE_LOG_SIZE) + +/* The number of tx packet completions that will be handled each NAPI poll + * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER. + */ +#define ENA_TX_POLL_BUDGET_DIVIDER 4 + +/* Refill Rx queue when number of required descriptors is above + * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET + */ +#define ENA_RX_REFILL_THRESH_DIVIDER 8 +#define ENA_RX_REFILL_THRESH_PACKET 256 + +/* Number of queues to check for missing queues per timer service */ +#define ENA_MONITORED_TX_QUEUES 4 +/* Max timeout packets before device reset */ +#define MAX_NUM_OF_TIMEOUTED_PACKETS 128 + +#define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1)) + +#define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1)) +#define ENA_RX_RING_IDX_ADD(idx, n, ring_size) \ + (((idx) + (n)) & ((ring_size) - 1)) + +#define ENA_IO_TXQ_IDX(q) (2 * (q)) +#define ENA_IO_RXQ_IDX(q) (2 * (q) + 1) +#define ENA_IO_TXQ_IDX_TO_COMBINED_IDX(q) ((q) / 2) +#define ENA_IO_RXQ_IDX_TO_COMBINED_IDX(q) (((q) - 1) / 2) + +#define ENA_MGMNT_IRQ_IDX 0 +#define ENA_IO_IRQ_FIRST_IDX 1 +#define ENA_IO_IRQ_IDX(q) (ENA_IO_IRQ_FIRST_IDX + (q)) + +#define ENA_ADMIN_POLL_DELAY_US 100 + +/* ENA device should send keep alive msg every 1 sec. + * We wait for 6 sec just to be on the safe side. + */ +#define ENA_DEVICE_KALIVE_TIMEOUT (6 * HZ) +#define ENA_MAX_NO_INTERRUPT_ITERATIONS 3 + +#define ENA_MMIO_DISABLE_REG_READ BIT(0) + +/* The max MTU size is configured to be the ethernet frame size without + * the overhead of the ethernet header, which can have a VLAN header, and + * a frame check sequence (FCS). + * The buffer size we share with the device is defined to be ENA_PAGE_SIZE + */ + +#define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \ + VLAN_HLEN - XDP_PACKET_HEADROOM - \ + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) + +#define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \ + ((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues)) + +struct ena_irq { + irq_handler_t handler; + void *data; + int cpu; + u32 vector; + cpumask_t affinity_hint_mask; + char name[ENA_IRQNAME_SIZE]; +}; + +struct ena_napi { + u8 first_interrupt ____cacheline_aligned; + u8 interrupts_masked; + struct napi_struct napi; + struct ena_ring *tx_ring; + struct ena_ring *rx_ring; + struct ena_ring *xdp_ring; + u32 qid; + struct dim dim; +}; + +struct ena_tx_buffer { + struct sk_buff *skb; + /* num of ena desc for this specific skb + * (includes data desc and metadata desc) + */ + u32 tx_descs; + /* num of buffers used by this skb */ + u32 num_of_bufs; + + /* XDP buffer structure which is used for sending packets in + * the xdp queues + */ + struct xdp_frame *xdpf; + + /* Indicate if bufs[0] map the linear data of the skb. */ + u8 map_linear_data; + + /* Used for detect missing tx packets to limit the number of prints */ + u32 print_once; + /* Save the last jiffies to detect missing tx packets + * + * sets to non zero value on ena_start_xmit and set to zero on + * napi and timer_Service_routine. + * + * while this value is not protected by lock, + * a given packet is not expected to be handled by ena_start_xmit + * and by napi/timer_service at the same time. + */ + unsigned long last_jiffies; + struct ena_com_buf bufs[ENA_PKT_MAX_BUFS]; +} ____cacheline_aligned; + +struct ena_rx_buffer { + struct sk_buff *skb; + struct page *page; + u32 page_offset; + struct ena_com_buf ena_buf; +} ____cacheline_aligned; + +struct ena_stats_tx { + u64 cnt; + u64 bytes; + u64 queue_stop; + u64 prepare_ctx_err; + u64 queue_wakeup; + u64 dma_mapping_err; + u64 linearize; + u64 linearize_failed; + u64 napi_comp; + u64 tx_poll; + u64 doorbells; + u64 bad_req_id; + u64 llq_buffer_copy; + u64 missed_tx; + u64 unmask_interrupt; + u64 last_napi_jiffies; +}; + +struct ena_stats_rx { + u64 cnt; + u64 bytes; + u64 rx_copybreak_pkt; + u64 csum_good; + u64 refil_partial; + u64 csum_bad; + u64 page_alloc_fail; + u64 skb_alloc_fail; + u64 dma_mapping_err; + u64 bad_desc_num; + u64 bad_req_id; + u64 empty_rx_ring; + u64 csum_unchecked; + u64 xdp_aborted; + u64 xdp_drop; + u64 xdp_pass; + u64 xdp_tx; + u64 xdp_invalid; + u64 xdp_redirect; +}; + +struct ena_ring { + /* Holds the empty requests for TX/RX + * out of order completions + */ + u16 *free_ids; + + union { + struct ena_tx_buffer *tx_buffer_info; + struct ena_rx_buffer *rx_buffer_info; + }; + + /* cache ptr to avoid using the adapter */ + struct device *dev; + struct pci_dev *pdev; + struct napi_struct *napi; + struct net_device *netdev; + struct ena_com_dev *ena_dev; + struct ena_adapter *adapter; + struct ena_com_io_cq *ena_com_io_cq; + struct ena_com_io_sq *ena_com_io_sq; + struct bpf_prog *xdp_bpf_prog; + struct xdp_rxq_info xdp_rxq; + spinlock_t xdp_tx_lock; /* synchronize XDP TX/Redirect traffic */ + /* Used for rx queues only to point to the xdp tx ring, to + * which traffic should be redirected from this rx ring. + */ + struct ena_ring *xdp_ring; + + u16 next_to_use; + u16 next_to_clean; + u16 rx_copybreak; + u16 rx_headroom; + u16 qid; + u16 mtu; + u16 sgl_size; + + /* The maximum header length the device can handle */ + u8 tx_max_header_size; + + bool disable_meta_caching; + u16 no_interrupt_event_cnt; + + /* cpu and NUMA for TPH */ + int cpu; + int numa_node; + + /* number of tx/rx_buffer_info's entries */ + int ring_size; + + enum ena_admin_placement_policy_type tx_mem_queue_type; + + struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS]; + u32 smoothed_interval; + u32 per_napi_packets; + u16 non_empty_napi_events; + struct u64_stats_sync syncp; + union { + struct ena_stats_tx tx_stats; + struct ena_stats_rx rx_stats; + }; + + u8 *push_buf_intermediate_buf; + int empty_rx_queue; +} ____cacheline_aligned; + +struct ena_stats_dev { + u64 tx_timeout; + u64 suspend; + u64 resume; + u64 wd_expired; + u64 interface_up; + u64 interface_down; + u64 admin_q_pause; + u64 rx_drops; + u64 tx_drops; +}; + +enum ena_flags_t { + ENA_FLAG_DEVICE_RUNNING, + ENA_FLAG_DEV_UP, + ENA_FLAG_LINK_UP, + ENA_FLAG_MSIX_ENABLED, + ENA_FLAG_TRIGGER_RESET, + ENA_FLAG_ONGOING_RESET +}; + +/* adapter specific private data structure */ +struct ena_adapter { + struct ena_com_dev *ena_dev; + /* OS defined structs */ + struct net_device *netdev; + struct pci_dev *pdev; + + /* rx packets that shorter that this len will be copied to the skb + * header + */ + u32 rx_copybreak; + u32 max_mtu; + + u32 num_io_queues; + u32 max_num_io_queues; + + int msix_vecs; + + u32 missing_tx_completion_threshold; + + u32 requested_tx_ring_size; + u32 requested_rx_ring_size; + + u32 max_tx_ring_size; + u32 max_rx_ring_size; + + u32 msg_enable; + + u16 max_tx_sgl_size; + u16 max_rx_sgl_size; + + u8 mac_addr[ETH_ALEN]; + + unsigned long keep_alive_timeout; + unsigned long missing_tx_completion_to; + + char name[ENA_NAME_MAX_LEN]; + + unsigned long flags; + /* TX */ + struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES] + ____cacheline_aligned_in_smp; + + /* RX */ + struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES] + ____cacheline_aligned_in_smp; + + struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES]; + + struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)]; + + /* timer service */ + struct work_struct reset_task; + struct timer_list timer_service; + + bool wd_state; + bool dev_up_before_reset; + bool disable_meta_caching; + unsigned long last_keep_alive_jiffies; + + struct u64_stats_sync syncp; + struct ena_stats_dev dev_stats; + struct ena_admin_eni_stats eni_stats; + + /* last queue index that was checked for uncompleted tx packets */ + u32 last_monitored_tx_qid; + + enum ena_regs_reset_reason_types reset_reason; + + struct bpf_prog *xdp_bpf_prog; + u32 xdp_first_ring; + u32 xdp_num_queues; +}; + +void ena_set_ethtool_ops(struct net_device *netdev); + +void ena_dump_stats_to_dmesg(struct ena_adapter *adapter); + +void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf); + +int ena_update_hw_stats(struct ena_adapter *adapter); + +int ena_update_queue_sizes(struct ena_adapter *adapter, + u32 new_tx_size, + u32 new_rx_size); + +int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count); + +int ena_set_rx_copybreak(struct ena_adapter *adapter, u32 rx_copybreak); + +int ena_get_sset_count(struct net_device *netdev, int sset); + +static inline void ena_reset_device(struct ena_adapter *adapter, + enum ena_regs_reset_reason_types reset_reason) +{ + adapter->reset_reason = reset_reason; + /* Make sure reset reason is set before triggering the reset */ + smp_mb__before_atomic(); + set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags); +} + +enum ena_xdp_errors_t { + ENA_XDP_ALLOWED = 0, + ENA_XDP_CURRENT_MTU_TOO_LARGE, + ENA_XDP_NO_ENOUGH_QUEUES, +}; + +enum ENA_XDP_ACTIONS { + ENA_XDP_PASS = 0, + ENA_XDP_TX = BIT(0), + ENA_XDP_REDIRECT = BIT(1), + ENA_XDP_DROP = BIT(2) +}; + +#define ENA_XDP_FORWARDED (ENA_XDP_TX | ENA_XDP_REDIRECT) + +static inline bool ena_xdp_present(struct ena_adapter *adapter) +{ + return !!adapter->xdp_bpf_prog; +} + +static inline bool ena_xdp_present_ring(struct ena_ring *ring) +{ + return !!ring->xdp_bpf_prog; +} + +static inline bool ena_xdp_legal_queue_count(struct ena_adapter *adapter, + u32 queues) +{ + return 2 * queues <= adapter->max_num_io_queues; +} + +static inline enum ena_xdp_errors_t ena_xdp_allowed(struct ena_adapter *adapter) +{ + enum ena_xdp_errors_t rc = ENA_XDP_ALLOWED; + + if (adapter->netdev->mtu > ENA_XDP_MAX_MTU) + rc = ENA_XDP_CURRENT_MTU_TOO_LARGE; + else if (!ena_xdp_legal_queue_count(adapter, adapter->num_io_queues)) + rc = ENA_XDP_NO_ENOUGH_QUEUES; + + return rc; +} + +#endif /* !(ENA_H) */ |