diff options
Diffstat (limited to 'drivers/net/qlge/qlge.h')
| -rw-r--r-- | drivers/net/qlge/qlge.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/net/qlge/qlge.h b/drivers/net/qlge/qlge.h index 459663a4023..4cb3647bb1b 100644 --- a/drivers/net/qlge/qlge.h +++ b/drivers/net/qlge/qlge.h @@ -1145,7 +1145,7 @@ struct tx_ring { struct wqicb wqicb; /* structure used to inform chip of new queue */ void *wq_base; /* pci_alloc:virtual addr for tx */ dma_addr_t wq_base_dma; /* pci_alloc:dma addr for tx */ - u32 *cnsmr_idx_sh_reg; /* shadow copy of consumer idx */ + __le32 *cnsmr_idx_sh_reg; /* shadow copy of consumer idx */ dma_addr_t cnsmr_idx_sh_reg_dma; /* dma-shadow copy of consumer */ u32 wq_size; /* size in bytes of queue area */ u32 wq_len; /* number of entries in queue */ @@ -1181,7 +1181,7 @@ struct rx_ring { u32 cq_size; u32 cq_len; u16 cq_id; - volatile __le32 *prod_idx_sh_reg; /* Shadowed producer register. */ + __le32 *prod_idx_sh_reg; /* Shadowed producer register. */ dma_addr_t prod_idx_sh_reg_dma; void __iomem *cnsmr_idx_db_reg; /* PCI doorbell mem area + 0 */ u32 cnsmr_idx; /* current sw idx */ @@ -1459,6 +1459,24 @@ static inline void ql_write_db_reg(u32 val, void __iomem *addr) mmiowb(); } +/* + * Shadow Registers: + * Outbound queues have a consumer index that is maintained by the chip. + * Inbound queues have a producer index that is maintained by the chip. + * For lower overhead, these registers are "shadowed" to host memory + * which allows the device driver to track the queue progress without + * PCI reads. When an entry is placed on an inbound queue, the chip will + * update the relevant index register and then copy the value to the + * shadow register in host memory. + */ +static inline u32 ql_read_sh_reg(__le32 *addr) +{ + u32 reg; + reg = le32_to_cpu(*addr); + rmb(); + return reg; +} + extern char qlge_driver_name[]; extern const char qlge_driver_version[]; extern const struct ethtool_ops qlge_ethtool_ops; |