xgehal-channel.h revision a23fd118e437af0a7877dd313db8fdaa3537c675
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/*
* Copyright (c) 2002-2005 Neterion, Inc.
* All right Reserved.
*
* FileName : xgehal-channel.h
*
* Description: HAL channel object functionality
*
* Created: 19 May 2004
*/
#ifndef XGE_HAL_CHANNEL_H
#define XGE_HAL_CHANNEL_H
#include "xge-os-pal.h"
#include "xge-list.h"
#include "xgehal-types.h"
#include "xgehal-stats.h"
/**
* enum xge_hal_channel_type_e - Enumerated channel types.
* @XGE_HAL_CHANNEL_TYPE_FIFO: fifo.
* @XGE_HAL_CHANNEL_TYPE_RING: ring.
* @XGE_HAL_CHANNEL_TYPE_MAX: Maximum number of HAL-supported
* (and recognized) channel types. Currently: two.
*
* Enumerated channel types. Currently there are only two link-layer
* channels - Xframe fifo and Xframe ring. In the future the list will grow.
*/
typedef enum xge_hal_channel_type_e {
/**
* enum xge_hal_channel_flag_e - Channel flags.
* @XGE_HAL_CHANNEL_FLAG_NONE: zero (nil) flag.
* @XGE_HAL_CHANNEL_FLAG_USE_TX_LOCK: use lock when posting transmit
* descriptor.
* @XGE_HAL_CHANNEL_FLAG_FREE_RXD: to-be-defined.
*
* Channel opening flags. Reserved for future usage.
*/
typedef enum xge_hal_channel_flag_e {
XGE_HAL_CHANNEL_FLAG_NONE = 0x0,
/**
* enum xge_hal_dtr_state_e - Descriptor (DTR) state.
* @XGE_HAL_DTR_STATE_NONE: Invalid state.
* @XGE_HAL_DTR_STATE_AVAIL: Descriptor is available for reservation
* (via xge_hal_fifo_dtr_reserve(), xge_hal_ring_dtr_reserve(), etc.).
* @XGE_HAL_DTR_STATE_POSTED: Descriptor is posted for processing by the
* device.
* @XGE_HAL_DTR_STATE_FREED: Descriptor is free and can be reused for
* filling-in and posting later.
*
* please refer to ch_intern{}.
*
* See also: xge_hal_channel_dtr_term_f{}.
*/
typedef enum xge_hal_dtr_state_e {
/**
* enum xge_hal_channel_reopen_e - Channel open, close, or reopen option.
* @XGE_HAL_CHANNEL_RESET_ONLY: Do not (de)allocate channel; used with
* xge_hal_channel_open(), xge_hal_channel_close().
* @XGE_HAL_CHANNEL_OC_NORMAL: Do (de)allocate channel; used with
* xge_hal_channel_open(), xge_hal_channel_close().
*
* Enumerates options used with channel open and close operations.
* The @XGE_HAL_CHANNEL_RESET_ONLY can be used when resetting the device;
* in this case there is actually no need to free and then again malloc
* the memory (including DMA-able memory) used for channel operation.
*/
typedef enum xge_hal_channel_reopen_e {
/**
* function xge_hal_channel_callback_f - Channel callback.
* @channelh: Channel "containing" 1 or more completed descriptors.
* @dtrh: First completed descriptor.
* @t_code: Transfer code, as per Xframe User Guide.
* Returned by HAL.
* @host_control: Opaque 64bit data stored by ULD inside the Xframe
* descriptor prior to posting the latter on the channel
* via xge_hal_fifo_dtr_post() or xge_hal_ring_dtr_post().
* The @host_control is returned as is to the ULD with each
* completed descriptor.
* @userdata: Opaque per-channel data specified at channel open
* time, via xge_hal_channel_open().
*
* Channel completion callback (type declaration). A single per-channel
* callback is specified at channel open time, via
* xge_hal_channel_open().
* Typically gets called as part of the processing of the Interrupt
* Service Routine.
*
* Channel callback gets called by HAL if, and only if, there is at least
* one new completion on a given ring or fifo channel. Upon processing the
* first @dtrh ULD is _supposed_ to continue consuming completions
* using�one of the following HAL APIs:
* - xge_hal_fifo_dtr_next_completed()
* or
* - xge_hal_ring_dtr_next_completed().
*
* Note that failure to process new completions in a timely fashion
* leads to XGE_HAL_INF_OUT_OF_DESCRIPTORS condition.
*
* Non-zero @t_code means failure to process (transmit or receive, depending
* on the channel type) the descriptor.
*
* In the "transmit" case the failure could happen, for instance, when the
* link is down, in which case Xframe completes the descriptor because it
* is not able to send the data out.
*
* For details please refer to Xframe User Guide.
*
* See also: xge_hal_fifo_dtr_next_completed(),
* xge_hal_ring_dtr_next_completed(), xge_hal_channel_dtr_term_f{}.
*/
typedef xge_hal_status_e (*xge_hal_channel_callback_f)
/**
* function xge_hal_channel_dtr_init_f - Initialize descriptor callback.
* @channelh: Channel "containing" the @dtrh descriptor.
* @dtrh: Descriptor.
* @index: Index of the descriptor in the channel's set of descriptors.
* @userdata: Per-channel user data (a.k.a. context) specified at
* channel open time, via xge_hal_channel_open().
* @reopen: See xge_hal_channel_reopen_e{}.
*
* Initialize descriptor callback. Unless NULL is specified in the
* xge_hal_channel_attr_t{} structure passed to xge_hal_channel_open()),
* HAL invokes the callback as part of the xge_hal_channel_open()
* implementation.
* For the ring type of channel the ULD is expected to fill in this descriptor
* with buffer(s) and control information.
* For the fifo type of channel the ULD could use the callback to
*
* See also: xge_hal_channel_attr_t{}, xge_hal_channel_dtr_term_f{}.
*/
typedef xge_hal_status_e (*xge_hal_channel_dtr_init_f)
int index,
void *userdata,
/**
* function xge_hal_channel_dtr_term_f - Terminate descriptor callback.
* @channelh: Channel "containing" the @dtrh descriptor.
* @dtrh: First completed descriptor.
* @state: One of the xge_hal_dtr_state_e{} enumerated states.
* @userdata: Per-channel user data (a.k.a. context) specified at
* channel open time, via xge_hal_channel_open().
* @reopen: See xge_hal_channel_reopen_e{}.
*
* Terminate descriptor callback. Unless NULL is specified in the
* xge_hal_channel_attr_t{} structure passed to xge_hal_channel_open()),
* HAL invokes the callback as part of closing the corresponding
* channel, prior to de-allocating the channel and associated data
* structures (including descriptors).
* ULD should utilize the callback to (for instance) unmap
* and free DMA data buffers associated with the posted (state =
* XGE_HAL_DTR_STATE_POSTED) descriptors,
* as well as other relevant cleanup functions.
*
* See also: xge_hal_channel_attr_t{}, xge_hal_channel_dtr_init_f{}.
*/
void *userdata,
/**
* struct xge_hal_channel_attr_t - Channel open "template".
* @type: xge_hal_channel_type_e channel type.
* @post_qid: Queue ID to post descriptors. For the link layer this
* number should be in the 0..7 range.
* @compl_qid: Completion queue ID. Must be set to zero for the link layer.
* @callback: Channel completion callback. HAL invokes the callback when there
* are new completions on that channel. In many implementations
* the @callback executes in the hw interrupt context.
* @dtr_init: Channel's descriptor-initialize callback.
* See xge_hal_channel_dtr_init_f{}.
* If not NULL, HAL invokes the callback when opening
* the channel via xge_hal_channel_open().
* @dtr_term: Channel's descriptor-terminate callback. If not NULL,
* HAL invokes the callback when closing the corresponding channel.
* See also xge_hal_channel_dtr_term_f{}.
* @userdata: User-defined "context" of _that_ channel. Passed back to the
* user as one of the @callback, @dtr_init, and @dtr_term arguments.
* @per_dtr_space: If specified (i.e., greater than zero): extra space
* reserved by HAL per each transmit or receive (depending on the
* channel type) descriptor. Can be used to store,
* and retrieve on completion, information specific
* to the upper-layer.
* @flags: xge_hal_channel_flag_e enumerated flags.
*
* Channel open "template". User fills the structure with channel
* attributes and passes it to xge_hal_channel_open().
* Usage: See ex_open{}.
*/
typedef struct xge_hal_channel_attr_t {
int post_qid;
int compl_qid;
void *userdata;
int per_dtr_space;
/*
* xge_hal_channel_t
* @item: List item; used to maintain a list of open channels.
* @callback: Channel completion callback. See
* xge_hal_channel_callback_f.
* @compl_index: Completion index. At any point in time points on the
* position in the channel, which will contain next
* to-be-completed descriptor.
* @length: Channel length. Currently allocated number of descriptors.
* The channel length "grows" when more descriptors get allocated.
* See _hal_mempool_grow.
* @free_arr: Free array. Contains completed descriptors that were freed
* (i.e., handed over back to HAL) by ULD.
* See xge_hal_fifo_dtr_free(), xge_hal_ring_dtr_free().
* @free_lock: Lock to protect @free_arr.
* @post_index: Post index. At any point in time points on the
* position in the channel, which'll contain next to-be-posted
* descriptor.
* @post_lock: Lock to serialize multiple concurrent "posters" of descriptors
* on the given channel.
* @reserve_arr: Reserve array. Contains descriptors that can be reserved
* by ULD for the subsequent send or receive operation.
* See xge_hal_fifo_dtr_reserve(),
* xge_hal_ring_dtr_reserve().
* @reserve_length: Length of the @reserve_arr. The length dynamically
* changes: it decrements each time descriptor is reserved.
* @reserve_lock: Lock to serialize multiple concurrent threads accessing
* @reserve_arr.
* @reserve_threshold: Reserve threshold. Minimal number of free descriptors
* that ought to be preserved in the channel at all times.
* Note that @reserve_threshold >= 0 &&
* @reserve_threshold < @reserve_max.
* ------------ common section --------------------
* @devh: Device handle. HAL device object that contains _this_ channel.
* descriptors.
* @regh0: Base address of the device memory space handle. Copied from HAL device
* at channel open time.
* @regh1: Base address of the device memory space handle. Copied from HAL device
* at channel open time.
* @userdata: Per-channel opaque (void*) user-defined context, which may be
* upper-layer driver object, ULP connection, etc.
* Once channel is open, @userdata is passed back to user via
* xge_hal_channel_callback_f.
* @work_arr: Work array. Contains descriptors posted to the channel.
* Note that at any point in time @work_arr contains 3 types of
* descriptors:
* 1) posted but not yet consumed by Xframe device;
* 2) consumed but not yet completed;
* 3) completed but not yet freed
* (via xge_hal_fifo_dtr_free() or xge_hal_ring_dtr_free())
* @saved_arr: Array used internally to optimize channel full-duplex
* operation.
* @stats: Channel statistcis. Includes HAL internal counters, including
* for instance, number of times out-of-descriptors
* (see XGE_HAL_INF_OUT_OF_DESCRIPTORS) condition happened.
* ------------- "slow" section ------------------
* @type: Channel type. See xge_hal_channel_type_e{}.
* @post_qid: Identifies Xframe queue used for posting descriptors.
* @compl_qid: Identifies Xframe completion queue.
* @flags: Channel flags. See xge_hal_channel_flag_e{}.
* @reserve_initial: Initial number of descriptors allocated at channel open
* time (see xge_hal_channel_open()). The number of
* channel descriptors can grow at runtime
* up to @reserve_max value.
* @reserve_max: Maximum number of channel descriptors. See @reserve_initial.
* @is_open: True, if channel is open; false - otherwise.
* @per_dtr_space: Per-descriptor space (in bytes) that channel user can utilize
* to store per-operation control information.
*
* HAL channel object. HAL devices (see xge_hal_device_t{}) contains
* zero or more channels. HAL channel contains zero or more descriptors. The
* to remote peer(s) via the channel.
*
* See also: xge_hal_channel_type_e{}, xge_hal_channel_flag_e,
* xge_hal_channel_callback_f{}
*/
typedef struct {
void **free_arr;
int length;
int free_length;
int compl_index;
#ifdef __XGE_WIN__
#else
int post_index
#endif
void **reserve_arr;
int reserve_length;
int reserve_threshold;
int reserve_top;
int unused1;
/* common section */
void *userdata;
void **work_arr;
void **saved_arr;
void **orig_arr;
/* slow section */
int post_qid;
int compl_qid;
int reserve_initial;
int reserve_max;
int is_open;
int per_dtr_space;
#if defined(XGE_HAL_MSI)
#endif
#if defined(XGE_HAL_MSI_X)
int msix_idx;
#endif
int magic;
#ifdef __XGE_WIN__
#else
#endif
/* ========================== CHANNEL PRIVATE API ========================= */
static inline int
{
}
#define __HAL_STATIC_CHANNEL
#define __HAL_INLINE_CHANNEL
int offset);
/* ========================== CHANNEL PUBLIC API ========================= */
int copy_size);
#else /* XGE_FASTPATH_EXTERN */
#define __HAL_STATIC_CHANNEL static
#define __HAL_INLINE_CHANNEL inline
#include "xgehal-channel-fp.c"
#endif /* XGE_FASTPATH_INLINE */
#endif /* XGE_HAL_CHANNEL_H */