420 lines
12 KiB
C
420 lines
12 KiB
C
/**********************************************************************
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* Author: Cavium, Inc.
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*
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* Contact: support@cavium.com
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* Please include "LiquidIO" in the subject.
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*
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* Copyright (c) 2003-2016 Cavium, Inc.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, Version 2, as
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* published by the Free Software Foundation.
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*
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* This file is distributed in the hope that it will be useful, but
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* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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* NONINFRINGEMENT. See the GNU General Public License for more details.
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***********************************************************************/
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/*! \file octeon_droq.h
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* \brief Implementation of Octeon Output queues. "Output" is with
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* respect to the Octeon device on the NIC. From this driver's point of
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* view they are ingress queues.
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*/
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#ifndef __OCTEON_DROQ_H__
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#define __OCTEON_DROQ_H__
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/* Default number of packets that will be processed in one iteration. */
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#define MAX_PACKET_BUDGET 0xFFFFFFFF
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/** Octeon descriptor format.
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* The descriptor ring is made of descriptors which have 2 64-bit values:
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* -# Physical (bus) address of the data buffer.
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* -# Physical (bus) address of a octeon_droq_info structure.
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* The Octeon device DMA's incoming packets and its information at the address
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* given by these descriptor fields.
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*/
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struct octeon_droq_desc {
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/** The buffer pointer */
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u64 buffer_ptr;
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/** The Info pointer */
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u64 info_ptr;
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};
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#define OCT_DROQ_DESC_SIZE (sizeof(struct octeon_droq_desc))
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/** Information about packet DMA'ed by Octeon.
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* The format of the information available at Info Pointer after Octeon
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* has posted a packet. Not all descriptors have valid information. Only
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* the Info field of the first descriptor for a packet has information
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* about the packet.
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*/
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struct octeon_droq_info {
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/** The Length of the packet. */
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u64 length;
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/** The Output Receive Header. */
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union octeon_rh rh;
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};
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#define OCT_DROQ_INFO_SIZE (sizeof(struct octeon_droq_info))
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struct octeon_skb_page_info {
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/* DMA address for the page */
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dma_addr_t dma;
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/* Page for the rx dma **/
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struct page *page;
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/** which offset into page */
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unsigned int page_offset;
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};
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/** Pointer to data buffer.
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* Driver keeps a pointer to the data buffer that it made available to
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* the Octeon device. Since the descriptor ring keeps physical (bus)
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* addresses, this field is required for the driver to keep track of
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* the virtual address pointers.
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*/
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struct octeon_recv_buffer {
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/** Packet buffer, including metadata. */
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void *buffer;
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/** Data in the packet buffer. */
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u8 *data;
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/** pg_info **/
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struct octeon_skb_page_info pg_info;
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};
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#define OCT_DROQ_RECVBUF_SIZE (sizeof(struct octeon_recv_buffer))
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/** Output Queue statistics. Each output queue has four stats fields. */
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struct oct_droq_stats {
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/** Number of packets received in this queue. */
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u64 pkts_received;
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/** Bytes received by this queue. */
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u64 bytes_received;
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/** Packets dropped due to no dispatch function. */
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u64 dropped_nodispatch;
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/** Packets dropped due to no memory available. */
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u64 dropped_nomem;
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/** Packets dropped due to large number of pkts to process. */
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u64 dropped_toomany;
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/** Number of packets sent to stack from this queue. */
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u64 rx_pkts_received;
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/** Number of Bytes sent to stack from this queue. */
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u64 rx_bytes_received;
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/** Num of Packets dropped due to receive path failures. */
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u64 rx_dropped;
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u64 rx_vxlan;
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/** Num of failures of recv_buffer_alloc() */
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u64 rx_alloc_failure;
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};
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/* The maximum number of buffers that can be dispatched from the
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* output/dma queue. Set to 64 assuming 1K buffers in DROQ and the fact that
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* max packet size from DROQ is 64K.
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*/
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#define MAX_RECV_BUFS 64
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/** Receive Packet format used when dispatching output queue packets
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* with non-raw opcodes.
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* The received packet will be sent to the upper layers using this
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* structure which is passed as a parameter to the dispatch function
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*/
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struct octeon_recv_pkt {
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/** Number of buffers in this received packet */
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u16 buffer_count;
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/** Id of the device that is sending the packet up */
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u16 octeon_id;
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/** Length of data in the packet buffer */
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u32 length;
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/** The receive header */
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union octeon_rh rh;
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/** Pointer to the OS-specific packet buffer */
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void *buffer_ptr[MAX_RECV_BUFS];
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/** Size of the buffers pointed to by ptr's in buffer_ptr */
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u32 buffer_size[MAX_RECV_BUFS];
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};
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#define OCT_RECV_PKT_SIZE (sizeof(struct octeon_recv_pkt))
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/** The first parameter of a dispatch function.
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* For a raw mode opcode, the driver dispatches with the device
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* pointer in this structure.
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* For non-raw mode opcode, the driver dispatches the recv_pkt
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* created to contain the buffers with data received from Octeon.
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* ---------------------
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* | *recv_pkt ----|---
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* |-------------------| |
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* | 0 or more bytes | |
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* | reserved by driver| |
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* |-------------------|<-/
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* | octeon_recv_pkt |
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* | |
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* |___________________|
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*/
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struct octeon_recv_info {
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void *rsvd;
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struct octeon_recv_pkt *recv_pkt;
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};
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#define OCT_RECV_INFO_SIZE (sizeof(struct octeon_recv_info))
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/** Allocate a recv_info structure. The recv_pkt pointer in the recv_info
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* structure is filled in before this call returns.
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* @param extra_bytes - extra bytes to be allocated at the end of the recv info
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* structure.
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* @return - pointer to a newly allocated recv_info structure.
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*/
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static inline struct octeon_recv_info *octeon_alloc_recv_info(int extra_bytes)
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{
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struct octeon_recv_info *recv_info;
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u8 *buf;
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buf = kmalloc(OCT_RECV_PKT_SIZE + OCT_RECV_INFO_SIZE +
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extra_bytes, GFP_ATOMIC);
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if (!buf)
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return NULL;
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recv_info = (struct octeon_recv_info *)buf;
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recv_info->recv_pkt =
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(struct octeon_recv_pkt *)(buf + OCT_RECV_INFO_SIZE);
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recv_info->rsvd = NULL;
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if (extra_bytes)
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recv_info->rsvd = buf + OCT_RECV_INFO_SIZE + OCT_RECV_PKT_SIZE;
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return recv_info;
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}
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/** Free a recv_info structure.
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* @param recv_info - Pointer to receive_info to be freed
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*/
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static inline void octeon_free_recv_info(struct octeon_recv_info *recv_info)
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{
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kfree(recv_info);
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}
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typedef int (*octeon_dispatch_fn_t)(struct octeon_recv_info *, void *);
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/** Used by NIC module to register packet handler and to get device
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* information for each octeon device.
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*/
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struct octeon_droq_ops {
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/** This registered function will be called by the driver with
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* the octeon id, pointer to buffer from droq and length of
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* data in the buffer. The receive header gives the port
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* number to the caller. Function pointer is set by caller.
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*/
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void (*fptr)(u32, void *, u32, union octeon_rh *, void *, void *);
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void *farg;
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/* This function will be called by the driver for all NAPI related
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* events. The first param is the octeon id. The second param is the
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* output queue number. The third is the NAPI event that occurred.
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*/
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void (*napi_fn)(void *);
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u32 poll_mode;
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/** Flag indicating if the DROQ handler should drop packets that
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* it cannot handle in one iteration. Set by caller.
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*/
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u32 drop_on_max;
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};
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/** The Descriptor Ring Output Queue structure.
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* This structure has all the information required to implement a
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* Octeon DROQ.
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*/
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struct octeon_droq {
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/** A spinlock to protect access to this ring. */
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spinlock_t lock;
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u32 q_no;
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u32 pkt_count;
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struct octeon_droq_ops ops;
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struct octeon_device *oct_dev;
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/** The 8B aligned descriptor ring starts at this address. */
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struct octeon_droq_desc *desc_ring;
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/** Index in the ring where the driver should read the next packet */
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u32 read_idx;
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/** Index in the ring where Octeon will write the next packet */
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u32 write_idx;
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/** Index in the ring where the driver will refill the descriptor's
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* buffer
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*/
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u32 refill_idx;
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/** Packets pending to be processed */
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atomic_t pkts_pending;
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/** Number of descriptors in this ring. */
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u32 max_count;
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/** The number of descriptors pending refill. */
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u32 refill_count;
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u32 pkts_per_intr;
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u32 refill_threshold;
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/** The max number of descriptors in DROQ without a buffer.
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* This field is used to keep track of empty space threshold. If the
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* refill_count reaches this value, the DROQ cannot accept a max-sized
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* (64K) packet.
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*/
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u32 max_empty_descs;
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/** The receive buffer list. This list has the virtual addresses of the
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* buffers.
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*/
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struct octeon_recv_buffer *recv_buf_list;
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/** The size of each buffer pointed by the buffer pointer. */
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u32 buffer_size;
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/** Pointer to the mapped packet credit register.
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* Host writes number of info/buffer ptrs available to this register
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*/
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void __iomem *pkts_credit_reg;
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/** Pointer to the mapped packet sent register.
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* Octeon writes the number of packets DMA'ed to host memory
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* in this register.
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*/
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void __iomem *pkts_sent_reg;
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struct list_head dispatch_list;
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/** Statistics for this DROQ. */
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struct oct_droq_stats stats;
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/** DMA mapped address of the DROQ descriptor ring. */
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size_t desc_ring_dma;
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/** application context */
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void *app_ctx;
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struct napi_struct napi;
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u32 cpu_id;
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call_single_data_t csd;
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};
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#define OCT_DROQ_SIZE (sizeof(struct octeon_droq))
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/**
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* Allocates space for the descriptor ring for the droq and sets the
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* base addr, num desc etc in Octeon registers.
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*
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* @param oct_dev - pointer to the octeon device structure
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* @param q_no - droq no. ranges from 0 - 3.
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* @param app_ctx - pointer to application context
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* @return Success: 0 Failure: 1
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*/
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int octeon_init_droq(struct octeon_device *oct_dev,
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u32 q_no,
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u32 num_descs,
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u32 desc_size,
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void *app_ctx);
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/**
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* Frees the space for descriptor ring for the droq.
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*
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* @param oct_dev - pointer to the octeon device structure
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* @param q_no - droq no. ranges from 0 - 3.
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* @return: Success: 0 Failure: 1
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*/
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int octeon_delete_droq(struct octeon_device *oct_dev, u32 q_no);
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/** Register a change in droq operations. The ops field has a pointer to a
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* function which will called by the DROQ handler for all packets arriving
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* on output queues given by q_no irrespective of the type of packet.
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* The ops field also has a flag which if set tells the DROQ handler to
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* drop packets if it receives more than what it can process in one
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* invocation of the handler.
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* @param oct - octeon device
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* @param q_no - octeon output queue number (0 <= q_no <= MAX_OCTEON_DROQ-1
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* @param ops - the droq_ops settings for this queue
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* @return - 0 on success, -ENODEV or -EINVAL on error.
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*/
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int
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octeon_register_droq_ops(struct octeon_device *oct,
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u32 q_no,
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struct octeon_droq_ops *ops);
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/** Resets the function pointer and flag settings made by
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* octeon_register_droq_ops(). After this routine is called, the DROQ handler
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* will lookup dispatch function for each arriving packet on the output queue
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* given by q_no.
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* @param oct - octeon device
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* @param q_no - octeon output queue number (0 <= q_no <= MAX_OCTEON_DROQ-1
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* @return - 0 on success, -ENODEV or -EINVAL on error.
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*/
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int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no);
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/** Register a dispatch function for a opcode/subcode. The driver will call
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* this dispatch function when it receives a packet with the given
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* opcode/subcode in its output queues along with the user specified
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* argument.
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* @param oct - the octeon device to register with.
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* @param opcode - the opcode for which the dispatch will be registered.
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* @param subcode - the subcode for which the dispatch will be registered
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* @param fn - the dispatch function.
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* @param fn_arg - user specified that will be passed along with the
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* dispatch function by the driver.
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* @return Success: 0; Failure: 1
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*/
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int octeon_register_dispatch_fn(struct octeon_device *oct,
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u16 opcode,
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u16 subcode,
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octeon_dispatch_fn_t fn, void *fn_arg);
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void *octeon_get_dispatch_arg(struct octeon_device *oct,
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u16 opcode, u16 subcode);
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void octeon_droq_print_stats(void);
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u32 octeon_droq_check_hw_for_pkts(struct octeon_droq *droq);
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int octeon_create_droq(struct octeon_device *oct, u32 q_no,
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u32 num_descs, u32 desc_size, void *app_ctx);
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int octeon_droq_process_packets(struct octeon_device *oct,
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struct octeon_droq *droq,
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u32 budget);
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int octeon_droq_process_poll_pkts(struct octeon_device *oct,
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struct octeon_droq *droq, u32 budget);
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int octeon_enable_irq(struct octeon_device *oct, u32 q_no);
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void octeon_droq_check_oom(struct octeon_droq *droq);
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#endif /*__OCTEON_DROQ_H__ */
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