diff options
Diffstat (limited to 'drivers/net/ethernet/fungible/funeth/funeth_txrx.h')
| -rw-r--r-- | drivers/net/ethernet/fungible/funeth/funeth_txrx.h | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/net/ethernet/fungible/funeth/funeth_txrx.h b/drivers/net/ethernet/fungible/funeth/funeth_txrx.h new file mode 100644 index 000000000..671f51135 --- /dev/null +++ b/drivers/net/ethernet/fungible/funeth/funeth_txrx.h @@ -0,0 +1,265 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */ + +#ifndef _FUNETH_TXRX_H +#define _FUNETH_TXRX_H + +#include <linux/netdevice.h> +#include <linux/u64_stats_sync.h> + +/* Tx descriptor size */ +#define FUNETH_SQE_SIZE 64U + +/* Size of device headers per Tx packet */ +#define FUNETH_FUNOS_HDR_SZ (sizeof(struct fun_eth_tx_req)) + +/* Number of gather list entries per Tx descriptor */ +#define FUNETH_GLE_PER_DESC (FUNETH_SQE_SIZE / sizeof(struct fun_dataop_gl)) + +/* Max gather list size in bytes for an sk_buff. */ +#define FUNETH_MAX_GL_SZ ((MAX_SKB_FRAGS + 1) * sizeof(struct fun_dataop_gl)) + +#if IS_ENABLED(CONFIG_TLS_DEVICE) +# define FUNETH_TLS_SZ sizeof(struct fun_eth_tls) +#else +# define FUNETH_TLS_SZ 0 +#endif + +/* Max number of Tx descriptors for an sk_buff using a gather list. */ +#define FUNETH_MAX_GL_DESC \ + DIV_ROUND_UP((FUNETH_FUNOS_HDR_SZ + FUNETH_MAX_GL_SZ + FUNETH_TLS_SZ), \ + FUNETH_SQE_SIZE) + +/* Max number of Tx descriptors for any packet. */ +#define FUNETH_MAX_PKT_DESC FUNETH_MAX_GL_DESC + +/* Rx CQ descriptor size. */ +#define FUNETH_CQE_SIZE 64U + +/* Offset of cqe_info within a CQE. */ +#define FUNETH_CQE_INFO_OFFSET (FUNETH_CQE_SIZE - sizeof(struct fun_cqe_info)) + +/* Construct the IRQ portion of a CQ doorbell. The resulting value arms the + * interrupt with the supplied time delay and packet count moderation settings. + */ +#define FUN_IRQ_CQ_DB(usec, pkts) \ + (FUN_DB_IRQ_ARM_F | ((usec) << FUN_DB_INTCOAL_USEC_S) | \ + ((pkts) << FUN_DB_INTCOAL_ENTRIES_S)) + +/* As above for SQ doorbells. */ +#define FUN_IRQ_SQ_DB(usec, pkts) \ + (FUN_DB_IRQ_ARM_F | \ + ((usec) << FUN_DB_INTCOAL_USEC_S) | \ + ((pkts) << FUN_DB_INTCOAL_ENTRIES_S)) + +/* Per packet tailroom. Present only for 1-frag packets. */ +#define FUN_RX_TAILROOM SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + +/* Per packet headroom for XDP. Preferred over XDP_PACKET_HEADROOM to + * accommodate two packets per buffer for 4K pages and 1500B MTUs. + */ +#define FUN_XDP_HEADROOM 192 + +/* Initialization state of a queue. */ +enum { + FUN_QSTATE_DESTROYED, /* what queue? */ + FUN_QSTATE_INIT_SW, /* exists in SW, not on the device */ + FUN_QSTATE_INIT_FULL, /* exists both in SW and on device */ +}; + +/* Initialization state of an interrupt. */ +enum { + FUN_IRQ_INIT, /* initialized and in the XArray but inactive */ + FUN_IRQ_REQUESTED, /* request_irq() done */ + FUN_IRQ_ENABLED, /* processing enabled */ + FUN_IRQ_DISABLED, /* processing disabled */ +}; + +struct bpf_prog; + +struct funeth_txq_stats { /* per Tx queue SW counters */ + u64 tx_pkts; /* # of Tx packets */ + u64 tx_bytes; /* total bytes of Tx packets */ + u64 tx_cso; /* # of packets with checksum offload */ + u64 tx_tso; /* # of non-encapsulated TSO super-packets */ + u64 tx_encap_tso; /* # of encapsulated TSO super-packets */ + u64 tx_uso; /* # of non-encapsulated UDP LSO super-packets */ + u64 tx_more; /* # of DBs elided due to xmit_more */ + u64 tx_nstops; /* # of times the queue has stopped */ + u64 tx_nrestarts; /* # of times the queue has restarted */ + u64 tx_map_err; /* # of packets dropped due to DMA mapping errors */ + u64 tx_xdp_full; /* # of XDP packets that could not be enqueued */ + u64 tx_tls_pkts; /* # of Tx TLS packets offloaded to HW */ + u64 tx_tls_bytes; /* Tx bytes of HW-handled TLS payload */ + u64 tx_tls_fallback; /* attempted Tx TLS offloads punted to SW */ + u64 tx_tls_drops; /* attempted Tx TLS offloads dropped */ +}; + +struct funeth_tx_info { /* per Tx descriptor state */ + union { + struct sk_buff *skb; /* associated packet (sk_buff path) */ + struct xdp_frame *xdpf; /* associated XDP frame (XDP path) */ + }; +}; + +struct funeth_txq { + /* RO cacheline of frequently accessed data */ + u32 mask; /* queue depth - 1 */ + u32 hw_qid; /* device ID of the queue */ + void *desc; /* base address of descriptor ring */ + struct funeth_tx_info *info; + struct device *dma_dev; /* device for DMA mappings */ + volatile __be64 *hw_wb; /* HW write-back location */ + u32 __iomem *db; /* SQ doorbell register address */ + struct netdev_queue *ndq; + dma_addr_t dma_addr; /* DMA address of descriptor ring */ + /* producer R/W cacheline */ + u16 qidx; /* queue index within net_device */ + u16 ethid; + u32 prod_cnt; /* producer counter */ + struct funeth_txq_stats stats; + /* shared R/W cacheline, primarily accessed by consumer */ + u32 irq_db_val; /* value written to IRQ doorbell */ + u32 cons_cnt; /* consumer (cleanup) counter */ + struct net_device *netdev; + struct fun_irq *irq; + int numa_node; + u8 init_state; /* queue initialization state */ + struct u64_stats_sync syncp; +}; + +struct funeth_rxq_stats { /* per Rx queue SW counters */ + u64 rx_pkts; /* # of received packets, including SW drops */ + u64 rx_bytes; /* total size of received packets */ + u64 rx_cso; /* # of packets with checksum offload */ + u64 rx_bufs; /* total # of Rx buffers provided to device */ + u64 gro_pkts; /* # of GRO superpackets */ + u64 gro_merged; /* # of pkts merged into existing GRO superpackets */ + u64 rx_page_alloc; /* # of page allocations for Rx buffers */ + u64 rx_budget; /* NAPI iterations that exhausted their budget */ + u64 rx_mem_drops; /* # of packets dropped due to memory shortage */ + u64 rx_map_err; /* # of page DMA mapping errors */ + u64 xdp_drops; /* XDP_DROPped packets */ + u64 xdp_tx; /* successful XDP transmits */ + u64 xdp_redir; /* successful XDP redirects */ + u64 xdp_err; /* packets dropped due to XDP errors */ +}; + +struct funeth_rxbuf { /* per Rx buffer state */ + struct page *page; /* associated page */ + dma_addr_t dma_addr; /* DMA address of page start */ + int pg_refs; /* page refs held by driver */ + int node; /* page node, or -1 if it is PF_MEMALLOC */ +}; + +struct funeth_rx_cache { /* cache of DMA-mapped previously used buffers */ + struct funeth_rxbuf *bufs; /* base of Rx buffer state ring */ + unsigned int prod_cnt; /* producer counter */ + unsigned int cons_cnt; /* consumer counter */ + unsigned int mask; /* depth - 1 */ +}; + +/* An Rx queue consists of a CQ and an SQ used to provide Rx buffers. */ +struct funeth_rxq { + struct net_device *netdev; + struct napi_struct *napi; + struct device *dma_dev; /* device for DMA mappings */ + void *cqes; /* base of CQ descriptor ring */ + const void *next_cqe_info; /* fun_cqe_info of next CQE */ + u32 __iomem *cq_db; /* CQ doorbell register address */ + unsigned int cq_head; /* CQ head index */ + unsigned int cq_mask; /* CQ depth - 1 */ + u16 phase; /* CQ phase tag */ + u16 qidx; /* queue index within net_device */ + unsigned int irq_db_val; /* IRQ info for CQ doorbell */ + struct fun_eprq_rqbuf *rqes; /* base of RQ descriptor ring */ + struct funeth_rxbuf *bufs; /* base of Rx buffer state ring */ + struct funeth_rxbuf *cur_buf; /* currently active buffer */ + u32 __iomem *rq_db; /* RQ doorbell register address */ + unsigned int rq_cons; /* RQ consumer counter */ + unsigned int rq_mask; /* RQ depth - 1 */ + unsigned int buf_offset; /* offset of next pkt in head buffer */ + u8 xdp_flush; /* XDP flush types needed at NAPI end */ + u8 init_state; /* queue initialization state */ + u16 headroom; /* per packet headroom */ + unsigned int rq_cons_db; /* value of rq_cons at last RQ db */ + unsigned int rq_db_thres; /* # of new buffers needed to write RQ db */ + struct funeth_rxbuf spare_buf; /* spare for next buffer replacement */ + struct funeth_rx_cache cache; /* used buffer cache */ + struct bpf_prog *xdp_prog; /* optional XDP BPF program */ + struct funeth_rxq_stats stats; + dma_addr_t cq_dma_addr; /* DMA address of CQE ring */ + dma_addr_t rq_dma_addr; /* DMA address of RQE ring */ + u16 irq_cnt; + u32 hw_cqid; /* device ID of the queue's CQ */ + u32 hw_sqid; /* device ID of the queue's SQ */ + int numa_node; + struct u64_stats_sync syncp; + struct xdp_rxq_info xdp_rxq; +}; + +#define FUN_QSTAT_INC(q, counter) \ + do { \ + u64_stats_update_begin(&(q)->syncp); \ + (q)->stats.counter++; \ + u64_stats_update_end(&(q)->syncp); \ + } while (0) + +#define FUN_QSTAT_READ(q, seq, stats_copy) \ + do { \ + seq = u64_stats_fetch_begin_irq(&(q)->syncp); \ + stats_copy = (q)->stats; \ + } while (u64_stats_fetch_retry_irq(&(q)->syncp, (seq))) + +#define FUN_INT_NAME_LEN (IFNAMSIZ + 16) + +struct fun_irq { + struct napi_struct napi; + struct funeth_txq *txq; + struct funeth_rxq *rxq; + u8 state; + u16 irq_idx; /* index of MSI-X interrupt */ + int irq; /* Linux IRQ vector */ + cpumask_t affinity_mask; /* IRQ affinity */ + struct irq_affinity_notify aff_notify; + char name[FUN_INT_NAME_LEN]; +} ____cacheline_internodealigned_in_smp; + +/* Return the start address of the idx-th Tx descriptor. */ +static inline void *fun_tx_desc_addr(const struct funeth_txq *q, + unsigned int idx) +{ + return q->desc + idx * FUNETH_SQE_SIZE; +} + +static inline void fun_txq_wr_db(const struct funeth_txq *q) +{ + unsigned int tail = q->prod_cnt & q->mask; + + writel(tail, q->db); +} + +static inline int fun_irq_node(const struct fun_irq *p) +{ + return cpu_to_mem(cpumask_first(&p->affinity_mask)); +} + +int fun_rxq_napi_poll(struct napi_struct *napi, int budget); +int fun_txq_napi_poll(struct napi_struct *napi, int budget); +netdev_tx_t fun_start_xmit(struct sk_buff *skb, struct net_device *netdev); +bool fun_xdp_tx(struct funeth_txq *q, struct xdp_frame *xdpf); +int fun_xdp_xmit_frames(struct net_device *dev, int n, + struct xdp_frame **frames, u32 flags); + +int funeth_txq_create(struct net_device *dev, unsigned int qidx, + unsigned int ndesc, struct fun_irq *irq, int state, + struct funeth_txq **qp); +int fun_txq_create_dev(struct funeth_txq *q, struct fun_irq *irq); +struct funeth_txq *funeth_txq_free(struct funeth_txq *q, int state); +int funeth_rxq_create(struct net_device *dev, unsigned int qidx, + unsigned int ncqe, unsigned int nrqe, struct fun_irq *irq, + int state, struct funeth_rxq **qp); +int fun_rxq_create_dev(struct funeth_rxq *q, struct fun_irq *irq); +struct funeth_rxq *funeth_rxq_free(struct funeth_rxq *q, int state); +int fun_rxq_set_bpf(struct funeth_rxq *q, struct bpf_prog *prog); + +#endif /* _FUNETH_TXRX_H */ |