[igbvf] Add igbvf driver

Driver for Intel 82576 based virtual functions, based on Intel source
code available at:

    http://sourceforge.net/projects/e1000  (igbvf-1.0.7)

Based on initial port from Eric Keller <ekeller@princeton.edu>.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/Makefile

@@ -64,6 +64,7 @@ SRCDIRS		+= drivers/net
 SRCDIRS		+= drivers/net/e1000
 SRCDIRS		+= drivers/net/e1000e
 SRCDIRS		+= drivers/net/igb
+SRCDIRS		+= drivers/net/igbvf
 SRCDIRS		+= drivers/net/phantom
 SRCDIRS		+= drivers/net/rtl818x
 SRCDIRS		+= drivers/net/ath5k

src/drivers/net/igbvf/igbvf.h

@@ -0,0 +1,375 @@
+/*******************************************************************************
+
+  Intel(R) 82576 Virtual Function Linux driver
+  Copyright(c) 1999 - 2008 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  Linux NICS <linux.nics@intel.com>
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+FILE_LICENCE ( GPL2_ONLY );
+
+/* Linux PRO/1000 Ethernet Driver main header file */
+
+#ifndef _IGBVF_H_
+#define _IGBVF_H_
+
+#include "igbvf_vf.h"
+
+/* Forward declarations */
+struct igbvf_info;
+struct igbvf_adapter;
+
+/* Interrupt defines */
+#define IGBVF_START_ITR                    648 /* ~6000 ints/sec */
+
+/* Tx/Rx descriptor defines */
+#define IGBVF_DEFAULT_TXD		256
+#define IGBVF_MAX_TXD			4096
+#define IGBVF_MIN_TXD			80
+
+#define IGBVF_DEFAULT_RXD		256
+#define IGBVF_MAX_RXD			4096
+#define IGBVF_MIN_RXD			80
+
+#define IGBVF_MIN_ITR_USECS		10 /* 100000 irq/sec */
+#define IGBVF_MAX_ITR_USECS		10000 /* 100    irq/sec */
+
+/* RX descriptor control thresholds.
+ * PTHRESH - MAC will consider prefetch if it has fewer than this number of
+ *           descriptors available in its onboard memory.
+ *           Setting this to 0 disables RX descriptor prefetch.
+ * HTHRESH - MAC will only prefetch if there are at least this many descriptors
+ *           available in host memory.
+ *           If PTHRESH is 0, this should also be 0.
+ * WTHRESH - RX descriptor writeback threshold - MAC will delay writing back
+ *           descriptors until either it has this many to write back, or the
+ *           ITR timer expires.
+ */
+#define IGBVF_RX_PTHRESH                    16
+#define IGBVF_RX_HTHRESH                     8
+#define IGBVF_RX_WTHRESH                     1
+
+#define IGBVF_TX_PTHRESH                     8
+#define IGBVF_TX_HTHRESH                     1
+#define IGBVF_TX_WTHRESH                     1
+
+/* this is the size past which hardware will drop packets when setting LPE=0 */
+#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
+
+#define IGBVF_FC_PAUSE_TIME		0x0680 /* 858 usec */
+
+/* How many Tx Descriptors do we need to call netif_wake_queue ? */
+#define IGBVF_TX_QUEUE_WAKE	32
+/* How many Rx Buffers do we bundle into one write to the hardware ? */
+#define IGBVF_RX_BUFFER_WRITE		16 /* Must be power of 2 */
+
+#define AUTO_ALL_MODES			0
+#define IGBVF_EEPROM_APME		0x0400
+
+#define IGBVF_MNG_VLAN_NONE		(-1)
+
+enum igbvf_boards {
+	board_vf,
+};
+
+struct igbvf_queue_stats {
+	u64 packets;
+	u64 bytes;
+};
+
+/*
+ * wrappers around a pointer to a socket buffer,
+ * so a DMA handle can be stored along with the buffer
+ */
+struct igbvf_buffer {
+	dma_addr_t dma;
+	dma_addr_t page_dma;
+	struct sk_buff *skb;
+	union {
+		/* Tx */
+		struct {
+			unsigned long time_stamp;
+			u16 length;
+			u16 next_to_watch;
+		};
+		/* Rx */
+		struct {
+			struct page *page;
+			unsigned int page_offset;
+		};
+	};
+	struct page *page;
+};
+
+struct igbvf_ring {
+	struct igbvf_adapter *adapter;  /* backlink */
+	void *desc;			/* pointer to ring memory  */
+	dma_addr_t dma;			/* phys address of ring    */
+	unsigned int size;		/* length of ring in bytes */
+	unsigned int count;		/* number of desc. in ring */
+
+	u16 next_to_use;
+	u16 next_to_clean;
+
+	u16 head;
+	u16 tail;
+
+	/* array of buffer information structs */
+	struct igbvf_buffer *buffer_info;
+#if 0
+	struct napi_struct napi;
+
+	char name[IFNAMSIZ + 5];
+#endif
+	u32 eims_value;
+	u32 itr_val;
+	u16 itr_register;
+	int set_itr;
+
+	struct sk_buff *rx_skb_top;
+
+	struct igbvf_queue_stats stats;
+};
+
+/* board specific private data structure */
+struct igbvf_adapter {
+#if 0
+	struct timer_list watchdog_timer;
+	struct timer_list blink_timer;
+
+	struct work_struct reset_task;
+	struct work_struct watchdog_task;
+
+	const struct igbvf_info *ei;
+
+	struct vlan_group *vlgrp;
+	u32 bd_number;
+	u32 rx_buffer_len;
+	u32 polling_interval;
+	u16 mng_vlan_id;
+	u16 link_speed;
+	u16 link_duplex;
+
+	spinlock_t tx_queue_lock; /* prevent concurrent tail updates */
+
+	/* track device up/down/testing state */
+	unsigned long state;
+
+	/* Interrupt Throttle Rate */
+	u32 itr;
+	u32 itr_setting;
+	u16 tx_itr;
+	u16 rx_itr;
+
+	/*
+	 * Tx
+	 */
+	struct igbvf_ring *tx_ring /* One per active queue */
+						____cacheline_aligned_in_smp;
+
+	unsigned long tx_queue_len;
+	unsigned int restart_queue;
+	u32 txd_cmd;
+
+	bool detect_tx_hung;
+	u8 tx_timeout_factor;
+
+	unsigned int total_tx_bytes;
+	unsigned int total_tx_packets;
+	unsigned int total_rx_bytes;
+	unsigned int total_rx_packets;
+
+	/* Tx stats */
+	u32 tx_timeout_count;
+	u32 tx_fifo_head;
+	u32 tx_head_addr;
+	u32 tx_fifo_size;
+	u32 tx_dma_failed;
+
+	/*
+	 * Rx
+	 */
+	struct igbvf_ring *rx_ring;
+
+	/* Rx stats */
+	u64 hw_csum_err;
+	u64 hw_csum_good;
+	u64 rx_hdr_split;
+	u32 alloc_rx_buff_failed;
+	u32 rx_dma_failed;
+
+	unsigned int rx_ps_hdr_size;
+	u32 max_frame_size;
+	u32 min_frame_size;
+
+	/* OS defined structs */
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+	struct net_device_stats net_stats;
+	spinlock_t stats_lock;      /* prevent concurrent stats updates */
+
+	/* structs defined in e1000_hw.h */
+	struct e1000_hw hw;
+
+	/* The VF counters don't clear on read so we have to get a base
+	 * count on driver start up and always subtract that base on
+	 * on the first update, thus the flag..
+	 */
+	struct e1000_vf_stats stats;
+	u64 zero_base;
+
+	struct igbvf_ring test_tx_ring;
+	struct igbvf_ring test_rx_ring;
+	u32 test_icr;
+
+	u32 msg_enable;
+	struct msix_entry *msix_entries;
+	int int_mode;
+	u32 eims_enable_mask;
+	u32 eims_other;
+	u32 int_counter0;
+	u32 int_counter1;
+
+	u32 eeprom_wol;
+	u32 wol;
+	u32 pba;
+
+	bool fc_autoneg;
+
+	unsigned long led_status;
+
+	unsigned int flags;
+	unsigned long last_reset;
+	u32 *config_space;
+#endif
+        /* OS defined structs */
+        struct net_device *netdev;
+        struct pci_device *pdev;
+        struct net_device_stats net_stats;
+
+        /* structs defined in e1000_hw.h */
+        struct e1000_hw hw;
+
+        u32 min_frame_size;
+        u32 max_frame_size;
+
+        u32 max_hw_frame_size;
+
+#define NUM_TX_DESC     8
+#define NUM_RX_DESC     8
+
+        struct io_buffer *tx_iobuf[NUM_TX_DESC];
+        struct io_buffer *rx_iobuf[NUM_RX_DESC];
+
+        union e1000_adv_tx_desc *tx_base;
+        union e1000_adv_rx_desc *rx_base;
+
+        uint32_t tx_ring_size;
+        uint32_t rx_ring_size;
+
+        uint32_t tx_head;
+        uint32_t tx_tail;
+        uint32_t tx_fill_ctr;
+
+        uint32_t rx_curr;
+
+        uint32_t ioaddr;
+        uint32_t irqno;
+
+        uint32_t tx_int_delay;
+        uint32_t tx_abs_int_delay;
+        uint32_t txd_cmd;
+};
+
+struct igbvf_info {
+	enum e1000_mac_type	mac;
+	unsigned int		flags;
+	u32			pba;
+	void			(*init_ops)(struct e1000_hw *);
+	s32			(*get_variants)(struct igbvf_adapter *);
+};
+
+/* hardware capability, feature, and workaround flags */
+#define IGBVF_FLAG_RX_CSUM_DISABLED       (1 << 0)
+
+#define IGBVF_DESC_UNUSED(R) \
+	((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
+	(R)->next_to_clean - (R)->next_to_use - 1)
+
+#define IGBVF_RX_DESC_ADV(R, i)	    \
+	(&(((union e1000_adv_rx_desc *)((R).desc))[i]))
+#define IGBVF_TX_DESC_ADV(R, i)	    \
+	(&(((union e1000_adv_tx_desc *)((R).desc))[i]))
+#define IGBVF_TX_CTXTDESC_ADV(R, i)	    \
+	(&(((struct e1000_adv_tx_context_desc *)((R).desc))[i]))
+
+enum igbvf_state_t {
+	__IGBVF_TESTING,
+	__IGBVF_RESETTING,
+	__IGBVF_DOWN
+};
+
+enum latency_range {
+	lowest_latency = 0,
+	low_latency = 1,
+	bulk_latency = 2,
+	latency_invalid = 255
+};
+
+extern char igbvf_driver_name[];
+extern const char igbvf_driver_version[];
+
+extern void igbvf_check_options(struct igbvf_adapter *adapter);
+extern void igbvf_set_ethtool_ops(struct net_device *netdev);
+#ifdef ETHTOOL_OPS_COMPAT
+extern int ethtool_ioctl(struct ifreq *ifr);
+#endif
+
+extern int igbvf_up(struct igbvf_adapter *adapter);
+extern void igbvf_down(struct igbvf_adapter *adapter);
+extern void igbvf_reinit_locked(struct igbvf_adapter *adapter);
+extern void igbvf_reset(struct igbvf_adapter *adapter);
+extern int igbvf_setup_rx_resources(struct igbvf_adapter *adapter);
+extern int igbvf_setup_tx_resources(struct igbvf_adapter *adapter);
+extern void igbvf_free_rx_resources(struct igbvf_adapter *adapter);
+extern void igbvf_free_tx_resources(struct igbvf_adapter *adapter);
+extern void igbvf_update_stats(struct igbvf_adapter *adapter);
+extern void igbvf_set_interrupt_capability(struct igbvf_adapter *adapter);
+extern void igbvf_reset_interrupt_capability(struct igbvf_adapter *adapter);
+
+extern unsigned int copybreak;
+
+static inline u32 __er32(struct e1000_hw *hw, unsigned long reg)
+{
+	return readl(hw->hw_addr + reg);
+}
+
+static inline void __ew32(struct e1000_hw *hw, unsigned long reg, u32 val)
+{
+	writel(val, hw->hw_addr + reg);
+}
+#define er32(reg)	E1000_READ_REG(hw, E1000_##reg)
+#define ew32(reg,val)	E1000_WRITE_REG(hw, E1000_##reg, (val))
+#define e1e_flush()	er32(STATUS)
+
+#endif /* _IGBVF_H_ */