net-next: Add multiqueue support to vmxnet3 driver

Add multiqueue support to vmxnet3 driver

This change adds multiqueue and thus receive side scaling support
to vmxnet3 device driver. Number of rx queues is limited to 1 in cases
where MSI is not configured or one MSIx vector is not available per rx
queue

Signed-off-by: Shreyas Bhatewara <sbhatewara@vmware.com>
Reviewed-by: Bhavesh Davda <bhavesh@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 51 insertions, 22 deletions

diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index edf228843afc..7fadeed37f03 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -68,11 +68,15 @@
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.0.14.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.0.16.0-k"
 
 /* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01000E00
+#define VMXNET3_DRIVER_VERSION_NUM      0x01001000
 
+#if defined(CONFIG_PCI_MSI)
+        /* RSS only makes sense if MSI-X is supported. */
+        #define VMXNET3_RSS
+#endif
 
 /*
  * Capabilities
@@ -218,16 +222,19 @@ struct vmxnet3_tx_ctx {
 };
 
 struct vmxnet3_tx_queue {
+        char                    name[IFNAMSIZ+8]; /* To identify interrupt */
+        struct vmxnet3_adapter          *adapter;
         spinlock_t                      tx_lock;
         struct vmxnet3_cmd_ring         tx_ring;
-        struct vmxnet3_tx_buf_info     *buf_info;
+        struct vmxnet3_tx_buf_info      *buf_info;
         struct vmxnet3_tx_data_ring     data_ring;
         struct vmxnet3_comp_ring        comp_ring;
-        struct Vmxnet3_TxQueueCtrl            *shared;
+        struct Vmxnet3_TxQueueCtrl      *shared;
         struct vmxnet3_tq_driver_stats  stats;
         bool                            stopped;
         int                             num_stop;  /* # of times the queue is
                                                     * stopped */
+        int                             qid;
 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
 
 enum vmxnet3_rx_buf_type {
@@ -259,6 +266,9 @@ struct vmxnet3_rq_driver_stats {
 };
 
 struct vmxnet3_rx_queue {
+        char                    name[IFNAMSIZ + 8]; /* To identify interrupt */
+        struct vmxnet3_adapter    *adapter;
+        struct napi_struct        napi;
         struct vmxnet3_cmd_ring   rx_ring[2];
         struct vmxnet3_comp_ring  comp_ring;
         struct vmxnet3_rx_ctx     rx_ctx;
@@ -271,7 +281,16 @@ struct vmxnet3_rx_queue {
         struct vmxnet3_rq_driver_stats  stats;
 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
 
-#define VMXNET3_LINUX_MAX_MSIX_VECT     1
+#define VMXNET3_DEVICE_MAX_TX_QUEUES 8
+#define VMXNET3_DEVICE_MAX_RX_QUEUES 8   /* Keep this value as a power of 2 */
+
+/* Should be less than UPT1_RSS_MAX_IND_TABLE_SIZE */
+#define VMXNET3_RSS_IND_TABLE_SIZE (VMXNET3_DEVICE_MAX_RX_QUEUES * 4)
+
+#define VMXNET3_LINUX_MAX_MSIX_VECT     (VMXNET3_DEVICE_MAX_TX_QUEUES + \
+                                         VMXNET3_DEVICE_MAX_RX_QUEUES + 1)
+#define VMXNET3_LINUX_MIN_MSIX_VECT     3    /* 1 for each : tx, rx and event */
+
 
 struct vmxnet3_intr {
         enum vmxnet3_intr_mask_mode  mask_mode;
@@ -279,27 +298,32 @@ struct vmxnet3_intr {
         u8  num_intrs;                  /* # of intr vectors */
         u8  event_intr_idx;             /* idx of the intr vector for event */
         u8  mod_levels[VMXNET3_LINUX_MAX_MSIX_VECT]; /* moderation level */
+        char    event_msi_vector_name[IFNAMSIZ+11];
 #ifdef CONFIG_PCI_MSI
         struct msix_entry msix_entries[VMXNET3_LINUX_MAX_MSIX_VECT];
 #endif
 };
 
+/* Interrupt sharing schemes, share_intr */
+#define VMXNET3_INTR_BUDDYSHARE 0    /* Corresponding tx,rx queues share irq */
+#define VMXNET3_INTR_TXSHARE 1       /* All tx queues share one irq */
+#define VMXNET3_INTR_DONTSHARE 2     /* each queue has its own irq */
+
+
 #define VMXNET3_STATE_BIT_RESETTING   0
 #define VMXNET3_STATE_BIT_QUIESCED    1
 struct vmxnet3_adapter {
-        struct vmxnet3_tx_queue         tx_queue;
-        struct vmxnet3_rx_queue         rx_queue;
-        struct napi_struct              napi;
-        struct vlan_group              *vlan_grp;
-
-        struct vmxnet3_intr             intr;
-
-        struct Vmxnet3_DriverShared    *shared;
-        struct Vmxnet3_PMConf          *pm_conf;
-        struct Vmxnet3_TxQueueDesc     *tqd_start;     /* first tx queue desc */
-        struct Vmxnet3_RxQueueDesc     *rqd_start;     /* first rx queue desc */
-        struct net_device              *netdev;
-        struct pci_dev                 *pdev;
+        struct vmxnet3_tx_queue         tx_queue[VMXNET3_DEVICE_MAX_TX_QUEUES];
+        struct vmxnet3_rx_queue         rx_queue[VMXNET3_DEVICE_MAX_RX_QUEUES];
+        struct vlan_group               *vlan_grp;
+        struct vmxnet3_intr             intr;
+        struct Vmxnet3_DriverShared     *shared;
+        struct Vmxnet3_PMConf           *pm_conf;
+        struct Vmxnet3_TxQueueDesc      *tqd_start;     /* all tx queue desc */
+        struct Vmxnet3_RxQueueDesc      *rqd_start;     /* all rx queue desc */
+        struct net_device               *netdev;
+        struct net_device_stats         net_stats;
+        struct pci_dev                  *pdev;
 
         u8                      __iomem *hw_addr0; /* for BAR 0 */
         u8                      __iomem *hw_addr1; /* for BAR 1 */
@@ -308,6 +332,12 @@ struct vmxnet3_adapter {
         bool                            rxcsum;
         bool                            lro;
         bool                            jumbo_frame;
+#ifdef VMXNET3_RSS
+        struct UPT1_RSSConf             *rss_conf;
+        bool                            rss;
+#endif
+        u32                             num_rx_queues;
+        u32                             num_tx_queues;
 
         /* rx buffer related */
         unsigned                        skb_buf_size;
@@ -327,6 +357,7 @@ struct vmxnet3_adapter {
         unsigned long  state;    /* VMXNET3_STATE_BIT_xxx */
 
         int dev_number;
+        int share_intr;
 };
 
 #define VMXNET3_WRITE_BAR0_REG(adapter, reg, val)  \
@@ -366,12 +397,10 @@ void
 vmxnet3_reset_dev(struct vmxnet3_adapter *adapter);
 
 void
-vmxnet3_tq_destroy(struct vmxnet3_tx_queue *tq,
-                   struct vmxnet3_adapter *adapter);
+vmxnet3_tq_destroy_all(struct vmxnet3_adapter *adapter);
 
 void
-vmxnet3_rq_destroy(struct vmxnet3_rx_queue *rq,
-                   struct vmxnet3_adapter *adapter);
+vmxnet3_rq_destroy_all(struct vmxnet3_adapter *adapter);
 
 int
 vmxnet3_create_queues(struct vmxnet3_adapter *adapter,