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linux/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
Anjali Singhai Jain 49d7d93331 i40e/i40evf: Do not free the dummy packet buffer synchronously 
The HW still needs to consume it and freeing it in the function
that created it would mean we will be racing with the HW. The
i40e_clean_tx_ring() routine will free up the buffer attached once
the HW has consumed it.  The clean_fdir_tx_irq function had to be fixed
to handle the freeing correctly.

Cases where we program more than one filter per flow (Ipv4), the
code had to be changed to allocate dummy buffer multiple times
since it will be freed by the clean routine.  This also fixes an issue
where the filter program routine was not checking if there were
descriptors available for programming a filter.

Change-ID: Idf72028fd873221934e319d021ef65a1e51acaf7
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2014-07-02 19:02:18 -07:00

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/*******************************************************************************
*
* Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
* Copyright(c) 2013 - 2014 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, see <http://www.gnu.org/licenses/>.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Contact Information:
* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
******************************************************************************/
#ifndef _I40E_TXRX_H_
#define _I40E_TXRX_H_
/* Interrupt Throttling and Rate Limiting Goodies */
#define I40E_MAX_ITR 0x0FF0 /* reg uses 2 usec resolution */
#define I40E_MIN_ITR 0x0004 /* reg uses 2 usec resolution */
#define I40E_MAX_IRATE 0x03F
#define I40E_MIN_IRATE 0x001
#define I40E_IRATE_USEC_RESOLUTION 4
#define I40E_ITR_100K 0x0005
#define I40E_ITR_20K 0x0019
#define I40E_ITR_8K 0x003E
#define I40E_ITR_4K 0x007A
#define I40E_ITR_RX_DEF I40E_ITR_8K
#define I40E_ITR_TX_DEF I40E_ITR_4K
#define I40E_ITR_DYNAMIC 0x8000 /* use top bit as a flag */
#define I40E_MIN_INT_RATE 250 /* ~= 1000000 / (I40E_MAX_ITR * 2) */
#define I40E_MAX_INT_RATE 500000 /* == 1000000 / (I40E_MIN_ITR * 2) */
#define I40E_DEFAULT_IRQ_WORK 256
#define ITR_TO_REG(setting) ((setting & ~I40E_ITR_DYNAMIC) >> 1)
#define ITR_IS_DYNAMIC(setting) (!!(setting & I40E_ITR_DYNAMIC))
#define ITR_REG_TO_USEC(itr_reg) (itr_reg << 1)
#define I40E_QUEUE_END_OF_LIST 0x7FF
/* this enum matches hardware bits and is meant to be used by DYN_CTLN
* registers and QINT registers or more generally anywhere in the manual
* mentioning ITR_INDX, ITR_NONE cannot be used as an index 'n' into any
* register but instead is a special value meaning "don't update" ITR0/1/2.
*/
enum i40e_dyn_idx_t {
I40E_IDX_ITR0 = 0,
I40E_IDX_ITR1 = 1,
I40E_IDX_ITR2 = 2,
I40E_ITR_NONE = 3 /* ITR_NONE must not be used as an index */
};
/* these are indexes into ITRN registers */
#define I40E_RX_ITR I40E_IDX_ITR0
#define I40E_TX_ITR I40E_IDX_ITR1
#define I40E_PE_ITR I40E_IDX_ITR2
/* Supported RSS offloads */
#define I40E_DEFAULT_RSS_HENA ( \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_UDP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_SCTP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_TCP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV4_OTHER) | \
((u64)1 << I40E_FILTER_PCTYPE_FRAG_IPV4) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_UDP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_TCP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_SCTP) | \
((u64)1 << I40E_FILTER_PCTYPE_NONF_IPV6_OTHER) | \
((u64)1 << I40E_FILTER_PCTYPE_FRAG_IPV6) | \
((u64)1 << I40E_FILTER_PCTYPE_L2_PAYLOAD))
/* Supported Rx Buffer Sizes */
#define I40E_RXBUFFER_512 512 /* Used for packet split */
#define I40E_RXBUFFER_2048 2048
#define I40E_RXBUFFER_3072 3072 /* For FCoE MTU of 2158 */
#define I40E_RXBUFFER_4096 4096
#define I40E_RXBUFFER_8192 8192
#define I40E_MAX_RXBUFFER 9728 /* largest size for single descriptor */
/* NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN means we
* reserve 2 more, and skb_shared_info adds an additional 384 bytes more,
* this adds up to 512 bytes of extra data meaning the smallest allocation
* we could have is 1K.
* i.e. RXBUFFER_512 --> size-1024 slab
*/
#define I40E_RX_HDR_SIZE I40E_RXBUFFER_512
/* How many Rx Buffers do we bundle into one write to the hardware ? */
#define I40E_RX_BUFFER_WRITE 16 /* Must be power of 2 */
#define I40E_RX_NEXT_DESC(r, i, n) \
do { \
(i)++; \
if ((i) == (r)->count) \
i = 0; \
(n) = I40E_RX_DESC((r), (i)); \
} while (0)
#define I40E_RX_NEXT_DESC_PREFETCH(r, i, n) \
do { \
I40E_RX_NEXT_DESC((r), (i), (n)); \
prefetch((n)); \
} while (0)
#define i40e_rx_desc i40e_32byte_rx_desc
#define I40E_MIN_TX_LEN 17
#define I40E_MAX_DATA_PER_TXD 8192
/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) DIV_ROUND_UP((S), I40E_MAX_DATA_PER_TXD)
#define DESC_NEEDED (MAX_SKB_FRAGS + 4)
#define I40E_TX_FLAGS_CSUM (u32)(1)
#define I40E_TX_FLAGS_HW_VLAN (u32)(1 << 1)
#define I40E_TX_FLAGS_SW_VLAN (u32)(1 << 2)
#define I40E_TX_FLAGS_TSO (u32)(1 << 3)
#define I40E_TX_FLAGS_IPV4 (u32)(1 << 4)
#define I40E_TX_FLAGS_IPV6 (u32)(1 << 5)
#define I40E_TX_FLAGS_FCCRC (u32)(1 << 6)
#define I40E_TX_FLAGS_FSO (u32)(1 << 7)
#define I40E_TX_FLAGS_FD_SB (u32)(1 << 9)
#define I40E_TX_FLAGS_VLAN_MASK 0xffff0000
#define I40E_TX_FLAGS_VLAN_PRIO_MASK 0xe0000000
#define I40E_TX_FLAGS_VLAN_PRIO_SHIFT 29
#define I40E_TX_FLAGS_VLAN_SHIFT 16
struct i40e_tx_buffer {
struct i40e_tx_desc *next_to_watch;
unsigned long time_stamp;
union {
struct sk_buff *skb;
void *raw_buf;
};
unsigned int bytecount;
unsigned short gso_segs;
DEFINE_DMA_UNMAP_ADDR(dma);
DEFINE_DMA_UNMAP_LEN(len);
u32 tx_flags;
};
struct i40e_rx_buffer {
struct sk_buff *skb;
dma_addr_t dma;
struct page *page;
dma_addr_t page_dma;
unsigned int page_offset;
};
struct i40e_queue_stats {
u64 packets;
u64 bytes;
};
struct i40e_tx_queue_stats {
u64 restart_queue;
u64 tx_busy;
u64 tx_done_old;
};
struct i40e_rx_queue_stats {
u64 non_eop_descs;
u64 alloc_page_failed;
u64 alloc_buff_failed;
};
enum i40e_ring_state_t {
__I40E_TX_FDIR_INIT_DONE,
__I40E_TX_XPS_INIT_DONE,
__I40E_TX_DETECT_HANG,
__I40E_HANG_CHECK_ARMED,
__I40E_RX_PS_ENABLED,
__I40E_RX_16BYTE_DESC_ENABLED,
};
#define ring_is_ps_enabled(ring) \
test_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
#define set_ring_ps_enabled(ring) \
set_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
#define clear_ring_ps_enabled(ring) \
clear_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
#define check_for_tx_hang(ring) \
test_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
#define set_check_for_tx_hang(ring) \
set_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
#define clear_check_for_tx_hang(ring) \
clear_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
#define ring_is_16byte_desc_enabled(ring) \
test_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
#define set_ring_16byte_desc_enabled(ring) \
set_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
#define clear_ring_16byte_desc_enabled(ring) \
clear_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
/* struct that defines a descriptor ring, associated with a VSI */
struct i40e_ring {
struct i40e_ring *next; /* pointer to next ring in q_vector */
void *desc; /* Descriptor ring memory */
struct device *dev; /* Used for DMA mapping */
struct net_device *netdev; /* netdev ring maps to */
union {
struct i40e_tx_buffer *tx_bi;
struct i40e_rx_buffer *rx_bi;
};
unsigned long state;
u16 queue_index; /* Queue number of ring */
u8 dcb_tc; /* Traffic class of ring */
u8 __iomem *tail;
u16 count; /* Number of descriptors */
u16 reg_idx; /* HW register index of the ring */
u16 rx_hdr_len;
u16 rx_buf_len;
u8 dtype;
#define I40E_RX_DTYPE_NO_SPLIT 0
#define I40E_RX_DTYPE_SPLIT_ALWAYS 1
#define I40E_RX_DTYPE_HEADER_SPLIT 2
u8 hsplit;
#define I40E_RX_SPLIT_L2 0x1
#define I40E_RX_SPLIT_IP 0x2
#define I40E_RX_SPLIT_TCP_UDP 0x4
#define I40E_RX_SPLIT_SCTP 0x8
/* used in interrupt processing */
u16 next_to_use;
u16 next_to_clean;
u8 atr_sample_rate;
u8 atr_count;
bool ring_active; /* is ring online or not */
/* stats structs */
struct i40e_queue_stats stats;
struct u64_stats_sync syncp;
union {
struct i40e_tx_queue_stats tx_stats;
struct i40e_rx_queue_stats rx_stats;
};
unsigned int size; /* length of descriptor ring in bytes */
dma_addr_t dma; /* physical address of ring */
struct i40e_vsi *vsi; /* Backreference to associated VSI */
struct i40e_q_vector *q_vector; /* Backreference to associated vector */
struct rcu_head rcu; /* to avoid race on free */
} ____cacheline_internodealigned_in_smp;
enum i40e_latency_range {
I40E_LOWEST_LATENCY = 0,
I40E_LOW_LATENCY = 1,
I40E_BULK_LATENCY = 2,
};
struct i40e_ring_container {
/* array of pointers to rings */
struct i40e_ring *ring;
unsigned int total_bytes; /* total bytes processed this int */
unsigned int total_packets; /* total packets processed this int */
u16 count;
enum i40e_latency_range latency_range;
u16 itr;
};
/* iterator for handling rings in ring container */
#define i40e_for_each_ring(pos, head) \
for (pos = (head).ring; pos != NULL; pos = pos->next)
void i40evf_alloc_rx_buffers(struct i40e_ring *rxr, u16 cleaned_count);
netdev_tx_t i40evf_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
void i40evf_clean_tx_ring(struct i40e_ring *tx_ring);
void i40evf_clean_rx_ring(struct i40e_ring *rx_ring);
int i40evf_setup_tx_descriptors(struct i40e_ring *tx_ring);
int i40evf_setup_rx_descriptors(struct i40e_ring *rx_ring);
void i40evf_free_tx_resources(struct i40e_ring *tx_ring);
void i40evf_free_rx_resources(struct i40e_ring *rx_ring);
int i40evf_napi_poll(struct napi_struct *napi, int budget);
#endif /* _I40E_TXRX_H_ */
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