From e27ef599abc559dfc9b40910071cb6f27277e243 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Sat, 20 Sep 2014 19:49:03 -0400 Subject: [PATCH] fm10k: add support for Tx/Rx rings This change adds the defines and structures necessary to support both Tx and Rx descriptor rings. Signed-off-by: Alexander Duyck Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/fm10k/fm10k.h | 188 ++++++++++++++++++ drivers/net/ethernet/intel/fm10k/fm10k_main.c | 63 +++++- .../net/ethernet/intel/fm10k/fm10k_netdev.c | 70 ++++++- drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 4 + 4 files changed, 323 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h index 826a11714d5e..c641f41a7aba 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k.h +++ b/drivers/net/ethernet/intel/fm10k/fm10k.h @@ -31,7 +31,118 @@ #define FM10K_MAX_JUMBO_FRAME_SIZE 15358 /* Maximum supported size 15K */ +#define MAX_QUEUES FM10K_MAX_QUEUES_PF + +#define FM10K_MIN_RXD 128 +#define FM10K_MAX_RXD 4096 +#define FM10K_DEFAULT_RXD 256 + +#define FM10K_MIN_TXD 128 +#define FM10K_MAX_TXD 4096 +#define FM10K_DEFAULT_TXD 256 +#define FM10K_DEFAULT_TX_WORK 256 + +#define FM10K_RXBUFFER_256 256 +#define FM10K_RXBUFFER_16384 16384 +#define FM10K_RX_HDR_LEN FM10K_RXBUFFER_256 +#if PAGE_SIZE <= FM10K_RXBUFFER_16384 +#define FM10K_RX_BUFSZ (PAGE_SIZE / 2) +#else +#define FM10K_RX_BUFSZ FM10K_RXBUFFER_16384 +#endif + +/* How many Rx Buffers do we bundle into one write to the hardware ? */ +#define FM10K_RX_BUFFER_WRITE 16 /* Must be power of 2 */ + +enum fm10k_ring_state_t { + __FM10K_TX_DETECT_HANG, + __FM10K_HANG_CHECK_ARMED, +}; + +#define check_for_tx_hang(ring) \ + test_bit(__FM10K_TX_DETECT_HANG, &(ring)->state) +#define set_check_for_tx_hang(ring) \ + set_bit(__FM10K_TX_DETECT_HANG, &(ring)->state) +#define clear_check_for_tx_hang(ring) \ + clear_bit(__FM10K_TX_DETECT_HANG, &(ring)->state) + +struct fm10k_tx_buffer { + struct fm10k_tx_desc *next_to_watch; + struct sk_buff *skb; + unsigned int bytecount; + u16 gso_segs; + u16 tx_flags; + DEFINE_DMA_UNMAP_ADDR(dma); + DEFINE_DMA_UNMAP_LEN(len); +}; + +struct fm10k_rx_buffer { + dma_addr_t dma; + struct page *page; + u32 page_offset; +}; + +struct fm10k_queue_stats { + u64 packets; + u64 bytes; +}; + +struct fm10k_tx_queue_stats { + u64 restart_queue; + u64 csum_err; + u64 tx_busy; + u64 tx_done_old; +}; + +struct fm10k_rx_queue_stats { + u64 alloc_failed; + u64 csum_err; + u64 errors; +}; + +struct fm10k_ring { + struct fm10k_q_vector *q_vector;/* backpointer to host q_vector */ + struct net_device *netdev; /* netdev ring belongs to */ + struct device *dev; /* device for DMA mapping */ + void *desc; /* descriptor ring memory */ + union { + struct fm10k_tx_buffer *tx_buffer; + struct fm10k_rx_buffer *rx_buffer; + }; + u32 __iomem *tail; + unsigned long state; + dma_addr_t dma; /* phys. address of descriptor ring */ + unsigned int size; /* length in bytes */ + + u8 queue_index; /* needed for queue management */ + u8 reg_idx; /* holds the special value that gets + * the hardware register offset + * associated with this ring, which is + * different for DCB and RSS modes + */ + u8 qos_pc; /* priority class of queue */ + u16 vid; /* default vlan ID of queue */ + u16 count; /* amount of descriptors */ + + u16 next_to_alloc; + u16 next_to_use; + u16 next_to_clean; + + struct fm10k_queue_stats stats; + struct u64_stats_sync syncp; + union { + /* Tx */ + struct fm10k_tx_queue_stats tx_stats; + /* Rx */ + struct { + struct fm10k_rx_queue_stats rx_stats; + struct sk_buff *skb; + }; + }; +} ____cacheline_internodealigned_in_smp; + struct fm10k_ring_container { + struct fm10k_ring *ring; /* pointer to linked list of rings */ unsigned int total_bytes; /* total bytes processed this int */ unsigned int total_packets; /* total packets processed this int */ u16 work_limit; /* total work allowed per interrupt */ @@ -46,6 +157,15 @@ struct fm10k_ring_container { #define FM10K_ITR_ENABLE (FM10K_ITR_AUTOMASK | FM10K_ITR_MASK_CLEAR) +static inline struct netdev_queue *txring_txq(const struct fm10k_ring *ring) +{ + return &ring->netdev->_tx[ring->queue_index]; +} + +/* iterator for handling rings in ring container */ +#define fm10k_for_each_ring(pos, head) \ + for (pos = &(head).ring[(head).count]; (--pos) >= (head).ring;) + #define MAX_Q_VECTORS 256 #define MIN_Q_VECTORS 1 enum fm10k_non_q_vectors { @@ -68,6 +188,9 @@ struct fm10k_q_vector { char name[IFNAMSIZ + 9]; struct rcu_head rcu; /* to avoid race with update stats on free */ + + /* for dynamic allocation of rings associated with this q_vector */ + struct fm10k_ring ring[0] ____cacheline_internodealigned_in_smp; }; enum fm10k_ring_f_enum { @@ -113,9 +236,15 @@ struct fm10k_intfc { int num_rx_queues; u16 rx_itr; + /* TX */ + struct fm10k_ring *tx_ring[MAX_QUEUES] ____cacheline_aligned_in_smp; + u64 rx_overrun_pf; u64 rx_overrun_vf; + /* RX */ + struct fm10k_ring *rx_ring[MAX_QUEUES]; + /* Queueing vectors */ struct fm10k_q_vector *q_vector[MAX_Q_VECTORS]; struct msix_entry *msix_entries; @@ -176,6 +305,65 @@ static inline int fm10k_mbx_trylock(struct fm10k_intfc *interface) return !test_and_set_bit(__FM10K_MBX_LOCK, &interface->state); } +/* fm10k_test_staterr - test bits in Rx descriptor status and error fields */ +static inline __le32 fm10k_test_staterr(union fm10k_rx_desc *rx_desc, + const u32 stat_err_bits) +{ + return rx_desc->d.staterr & cpu_to_le32(stat_err_bits); +} + +/* fm10k_desc_unused - calculate if we have unused descriptors */ +static inline u16 fm10k_desc_unused(struct fm10k_ring *ring) +{ + s16 unused = ring->next_to_clean - ring->next_to_use - 1; + + return likely(unused < 0) ? unused + ring->count : unused; +} + +#define FM10K_TX_DESC(R, i) \ + (&(((struct fm10k_tx_desc *)((R)->desc))[i])) +#define FM10K_RX_DESC(R, i) \ + (&(((union fm10k_rx_desc *)((R)->desc))[i])) + +#define FM10K_MAX_TXD_PWR 14 +#define FM10K_MAX_DATA_PER_TXD (1 << FM10K_MAX_TXD_PWR) + +/* Tx Descriptors needed, worst case */ +#define TXD_USE_COUNT(S) DIV_ROUND_UP((S), FM10K_MAX_DATA_PER_TXD) +#define DESC_NEEDED (MAX_SKB_FRAGS + 4) + +enum fm10k_tx_flags { + /* Tx offload flags */ + FM10K_TX_FLAGS_CSUM = 0x01, +}; + +/* This structure is stored as little endian values as that is the native + * format of the Rx descriptor. The ordering of these fields is reversed + * from the actual ftag header to allow for a single bswap to take care + * of placing all of the values in network order + */ +union fm10k_ftag_info { + __le64 ftag; + struct { + /* dglort and sglort combined into a single 32bit desc read */ + __le32 glort; + /* upper 16 bits of vlan are reserved 0 for swpri_type_user */ + __le32 vlan; + } d; + struct { + __le16 dglort; + __le16 sglort; + __le16 vlan; + __le16 swpri_type_user; + } w; +}; + +struct fm10k_cb { + union fm10k_ftag_info fi; +}; + +#define FM10K_CB(skb) ((struct fm10k_cb *)(skb)->cb) + /* main */ extern char fm10k_driver_name[]; extern const char fm10k_driver_version[]; diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c index b0a2ba1a623d..bf84c263df0e 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c @@ -183,10 +183,12 @@ static int fm10k_alloc_q_vector(struct fm10k_intfc *interface, unsigned int rxr_count, unsigned int rxr_idx) { struct fm10k_q_vector *q_vector; + struct fm10k_ring *ring; int ring_count, size; ring_count = txr_count + rxr_count; - size = sizeof(struct fm10k_q_vector); + size = sizeof(struct fm10k_q_vector) + + (sizeof(struct fm10k_ring) * ring_count); /* allocate q_vector and rings */ q_vector = kzalloc(size, GFP_KERNEL); @@ -202,14 +204,66 @@ static int fm10k_alloc_q_vector(struct fm10k_intfc *interface, q_vector->interface = interface; q_vector->v_idx = v_idx; + /* initialize pointer to rings */ + ring = q_vector->ring; + /* save Tx ring container info */ + q_vector->tx.ring = ring; + q_vector->tx.work_limit = FM10K_DEFAULT_TX_WORK; q_vector->tx.itr = interface->tx_itr; q_vector->tx.count = txr_count; + while (txr_count) { + /* assign generic ring traits */ + ring->dev = &interface->pdev->dev; + ring->netdev = interface->netdev; + + /* configure backlink on ring */ + ring->q_vector = q_vector; + + /* apply Tx specific ring traits */ + ring->count = interface->tx_ring_count; + ring->queue_index = txr_idx; + + /* assign ring to interface */ + interface->tx_ring[txr_idx] = ring; + + /* update count and index */ + txr_count--; + txr_idx += v_count; + + /* push pointer to next ring */ + ring++; + } + /* save Rx ring container info */ + q_vector->rx.ring = ring; q_vector->rx.itr = interface->rx_itr; q_vector->rx.count = rxr_count; + while (rxr_count) { + /* assign generic ring traits */ + ring->dev = &interface->pdev->dev; + ring->netdev = interface->netdev; + + /* configure backlink on ring */ + ring->q_vector = q_vector; + + /* apply Rx specific ring traits */ + ring->count = interface->rx_ring_count; + ring->queue_index = rxr_idx; + + /* assign ring to interface */ + interface->rx_ring[rxr_idx] = ring; + + /* update count and index */ + rxr_count--; + rxr_idx += v_count; + + /* push pointer to next ring */ + ring++; + } + return 0; } @@ -225,6 +279,13 @@ static int fm10k_alloc_q_vector(struct fm10k_intfc *interface, static void fm10k_free_q_vector(struct fm10k_intfc *interface, int v_idx) { struct fm10k_q_vector *q_vector = interface->q_vector[v_idx]; + struct fm10k_ring *ring; + + fm10k_for_each_ring(ring, q_vector->tx) + interface->tx_ring[ring->queue_index] = NULL; + + fm10k_for_each_ring(ring, q_vector->rx) + interface->rx_ring[ring->queue_index] = NULL; interface->q_vector[v_idx] = NULL; netif_napi_del(&q_vector->napi); diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c index 487efcbb309e..b987bb6a5e1c 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c @@ -67,10 +67,19 @@ int fm10k_open(struct net_device *netdev) /* setup GLORT assignment for this port */ fm10k_request_glort_range(interface); + /* Notify the stack of the actual queue counts */ + + err = netif_set_real_num_rx_queues(netdev, + interface->num_rx_queues); + if (err) + goto err_set_queues; + fm10k_up(interface); return 0; +err_set_queues: + fm10k_qv_free_irq(interface); err_req_irq: return err; } @@ -474,6 +483,64 @@ void fm10k_reset_rx_state(struct fm10k_intfc *interface) __dev_mc_unsync(netdev, NULL); } +/** + * fm10k_get_stats64 - Get System Network Statistics + * @netdev: network interface device structure + * @stats: storage space for 64bit statistics + * + * Returns 64bit statistics, for use in the ndo_get_stats64 callback. This + * function replaces fm10k_get_stats for kernels which support it. + */ +static struct rtnl_link_stats64 *fm10k_get_stats64(struct net_device *netdev, + struct rtnl_link_stats64 *stats) +{ + struct fm10k_intfc *interface = netdev_priv(netdev); + struct fm10k_ring *ring; + unsigned int start, i; + u64 bytes, packets; + + rcu_read_lock(); + + for (i = 0; i < interface->num_rx_queues; i++) { + ring = ACCESS_ONCE(interface->rx_ring[i]); + + if (!ring) + continue; + + do { + start = u64_stats_fetch_begin_irq(&ring->syncp); + packets = ring->stats.packets; + bytes = ring->stats.bytes; + } while (u64_stats_fetch_retry_irq(&ring->syncp, start)); + + stats->rx_packets += packets; + stats->rx_bytes += bytes; + } + + for (i = 0; i < interface->num_tx_queues; i++) { + ring = ACCESS_ONCE(interface->rx_ring[i]); + + if (!ring) + continue; + + do { + start = u64_stats_fetch_begin_irq(&ring->syncp); + packets = ring->stats.packets; + bytes = ring->stats.bytes; + } while (u64_stats_fetch_retry_irq(&ring->syncp, start)); + + stats->tx_packets += packets; + stats->tx_bytes += bytes; + } + + rcu_read_unlock(); + + /* following stats updated by fm10k_service_task() */ + stats->rx_missed_errors = netdev->stats.rx_missed_errors; + + return stats; +} + static const struct net_device_ops fm10k_netdev_ops = { .ndo_open = fm10k_open, .ndo_stop = fm10k_close, @@ -484,6 +551,7 @@ static const struct net_device_ops fm10k_netdev_ops = { .ndo_vlan_rx_add_vid = fm10k_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = fm10k_vlan_rx_kill_vid, .ndo_set_rx_mode = fm10k_set_rx_mode, + .ndo_get_stats64 = fm10k_get_stats64, }; #define DEFAULT_DEBUG_LEVEL_SHIFT 3 @@ -493,7 +561,7 @@ struct net_device *fm10k_alloc_netdev(void) struct fm10k_intfc *interface; struct net_device *dev; - dev = alloc_etherdev(sizeof(struct fm10k_intfc)); + dev = alloc_etherdev_mq(sizeof(struct fm10k_intfc), MAX_QUEUES); if (!dev) return NULL; diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index 2257ab1f4607..5a28298a19f8 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -707,6 +707,10 @@ static int fm10k_sw_init(struct fm10k_intfc *interface, netdev->hw_features &= ~NETIF_F_GSO_UDP_TUNNEL; } + /* set default ring sizes */ + interface->tx_ring_count = FM10K_DEFAULT_TXD; + interface->rx_ring_count = FM10K_DEFAULT_RXD; + /* set default interrupt moderation */ interface->tx_itr = FM10K_ITR_10K; interface->rx_itr = FM10K_ITR_ADAPTIVE | FM10K_ITR_20K; -- 2.20.1