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 <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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;