sfc: Add SR-IOV back-end support for SFC9000 family

On the SFC9000 family, each port has 1024 Virtual Interfaces (VIs),
each with an RX queue, a TX queue, an event queue and a mailbox
register.  These may be assigned to up to 127 SR-IOV virtual functions
per port, with up to 64 VIs per VF.

We allocate an extra channel (IRQ and event queue only) to receive
requests from VF drivers.

There is a per-port limit of 4 concurrent RX queue flushes, and queue
flushes may be initiated by the MC in response to a Function Level
Reset (FLR) of a VF.  Therefore, when SR-IOV is in use, we submit all
flush requests via the MC.

The RSS indirection table is shared with VFs, so the number of RX
queues used in the PF is limited to the number of VIs per VF.

This is almost entirely the work of Steve Hodgson, formerly
shodgson@solarflare.com.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 31 insertions, 1 deletions

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 7870cefcb203..3fbec458c323 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -24,6 +24,7 @@
 #include <linux/device.h>
 #include <linux/highmem.h>
 #include <linux/workqueue.h>
+#include <linux/mutex.h>
 #include <linux/vmalloc.h>
 #include <linux/i2c.h>
 
@@ -54,7 +55,8 @@
 
 #define EFX_MAX_CHANNELS 32U
 #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS
-#define EFX_MAX_EXTRA_CHANNELS  0U
+#define EFX_EXTRA_CHANNEL_IOV   0
+#define EFX_MAX_EXTRA_CHANNELS  1U
 
 /* Checksum generation is a per-queue option in hardware, so each
  * queue visible to the networking core is backed by two hardware TX
@@ -629,6 +631,8 @@ union efx_multicast_hash {
 };
 
 struct efx_filter_state;
+struct efx_vf;
+struct vfdi_status;
 
 /**
  * struct efx_nic - an Efx NIC
@@ -712,6 +716,17 @@ struct efx_filter_state;
  *      completed (either success or failure). Not used when MCDI is used to
  *      flush receive queues.
  * @flush_wq: wait queue used by efx_nic_flush_queues() to wait for flush completions.
+ * @vf: Array of &struct efx_vf objects.
+ * @vf_count: Number of VFs intended to be enabled.
+ * @vf_init_count: Number of VFs that have been fully initialised.
+ * @vi_scale: log2 number of vnics per VF.
+ * @vf_buftbl_base: The zeroth buffer table index used to back VF queues.
+ * @vfdi_status: Common VFDI status page to be dmad to VF address space.
+ * @local_addr_list: List of local addresses. Protected by %local_lock.
+ * @local_page_list: List of DMA addressable pages used to broadcast
+ *      %local_addr_list. Protected by %local_lock.
+ * @local_lock: Mutex protecting %local_addr_list and %local_page_list.
+ * @peer_work: Work item to broadcast peer addresses to VMs.
  * @monitor_work: Hardware monitor workitem
  * @biu_lock: BIU (bus interface unit) lock
  * @last_irq_cpu: Last CPU to handle a possible test interrupt.  This
@@ -762,6 +777,7 @@ struct efx_nic {
         unsigned next_buffer_table;
         unsigned n_channels;
         unsigned n_rx_channels;
+        unsigned rss_spread;
         unsigned tx_channel_offset;
         unsigned n_tx_channels;
         unsigned int rx_buffer_len;
@@ -820,6 +836,20 @@ struct efx_nic {
         atomic_t rxq_flush_outstanding;
         wait_queue_head_t flush_wq;
 
+#ifdef CONFIG_SFC_SRIOV
+        struct efx_channel *vfdi_channel;
+        struct efx_vf *vf;
+        unsigned vf_count;
+        unsigned vf_init_count;
+        unsigned vi_scale;
+        unsigned vf_buftbl_base;
+        struct efx_buffer vfdi_status;
+        struct list_head local_addr_list;
+        struct list_head local_page_list;
+        struct mutex local_lock;
+        struct work_struct peer_work;
+#endif
+
         /* The following fields may be written more often */
 
         struct delayed_work monitor_work ____cacheline_aligned_in_smp;