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soc: qcom: ipa: filter and routing tables
This patch contains code implementing filter and routing tables for the IPA. A filter table allows rules to be used for filtering packets that depart the AP at an endpoint. A filter table entry contains the address of a set of rules to apply for each endpoint that supports filtering. A routing table allows packets to be routed to an endpoint based on packet metadata. It is also a table whose entries each contain the address of a set of routing rules to apply. Neither filtering nor routing is supported by the current driver. All table entries refer to rules that mean "no filtering" and "no routing." Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder
David S. Miller
parent
84f9bd12d4
commit
2b9feef2b6
700
drivers/net/ipa/ipa_table.c
Normal file
700
drivers/net/ipa/ipa_table.c
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@ -0,0 +1,700 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/bits.h>
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#include <linux/bitops.h>
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#include <linux/bitfield.h>
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#include <linux/io.h>
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#include <linux/build_bug.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include "ipa.h"
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#include "ipa_version.h"
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#include "ipa_endpoint.h"
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#include "ipa_table.h"
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#include "ipa_reg.h"
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#include "ipa_mem.h"
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#include "ipa_cmd.h"
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#include "gsi.h"
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#include "gsi_trans.h"
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/**
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* DOC: IPA Filter and Route Tables
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*
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* The IPA has tables defined in its local shared memory that define filter
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* and routing rules. Each entry in these tables contains a 64-bit DMA
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* address that refers to DRAM (system memory) containing a rule definition.
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* A rule consists of a contiguous block of 32-bit values terminated with
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* 32 zero bits. A special "zero entry" rule consisting of 64 zero bits
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* represents "no filtering" or "no routing," and is the reset value for
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* filter or route table rules. Separate tables (both filter and route)
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* used for IPv4 and IPv6. Additionally, there can be hashed filter or
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* route tables, which are used when a hash of message metadata matches.
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* Hashed operation is not supported by all IPA hardware.
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*
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* Each filter rule is associated with an AP or modem TX endpoint, though
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* not all TX endpoints support filtering. The first 64-bit entry in a
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* filter table is a bitmap indicating which endpoints have entries in
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* the table. The low-order bit (bit 0) in this bitmap represents a
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* special global filter, which applies to all traffic. This is not
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* used in the current code. Bit 1, if set, indicates that there is an
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* entry (i.e. a DMA address referring to a rule) for endpoint 0 in the
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* table. Bit 2, if set, indicates there is an entry for endpoint 1,
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* and so on. Space is set aside in IPA local memory to hold as many
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* filter table entries as might be required, but typically they are not
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* all used.
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*
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* The AP initializes all entries in a filter table to refer to a "zero"
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* entry. Once initialized the modem and AP update the entries for
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* endpoints they "own" directly. Currently the AP does not use the
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* IPA filtering functionality.
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*
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* IPA Filter Table
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* ----------------------
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* endpoint bitmap | 0x0000000000000048 | Bits 3 and 6 set (endpoints 2 and 5)
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* |--------------------|
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* 1st endpoint | 0x000123456789abc0 | DMA address for modem endpoint 2 rule
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* |--------------------|
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* 2nd endpoint | 0x000123456789abf0 | DMA address for AP endpoint 5 rule
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* |--------------------|
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* (unused) | | (Unused space in filter table)
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* |--------------------|
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* . . .
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* |--------------------|
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* (unused) | | (Unused space in filter table)
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* ----------------------
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*
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* The set of available route rules is divided about equally between the AP
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* and modem. The AP initializes all entries in a route table to refer to
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* a "zero entry". Once initialized, the modem and AP are responsible for
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* updating their own entries. All entries in a route table are usable,
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* though the AP currently does not use the IPA routing functionality.
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*
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* IPA Route Table
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* ----------------------
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* 1st modem route | 0x0001234500001100 | DMA address for first route rule
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* |--------------------|
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* 2nd modem route | 0x0001234500001140 | DMA address for second route rule
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* |--------------------|
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* . . .
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* |--------------------|
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* Last modem route| 0x0001234500002280 | DMA address for Nth route rule
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* |--------------------|
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* 1st AP route | 0x0001234500001100 | DMA address for route rule (N+1)
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* |--------------------|
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* 2nd AP route | 0x0001234500001140 | DMA address for next route rule
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* |--------------------|
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* . . .
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* |--------------------|
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* Last AP route | 0x0001234500002280 | DMA address for last route rule
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* ----------------------
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*/
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/* IPA hardware constrains filter and route tables alignment */
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#define IPA_TABLE_ALIGN 128 /* Minimum table alignment */
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/* Assignment of route table entries to the modem and AP */
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#define IPA_ROUTE_MODEM_MIN 0
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#define IPA_ROUTE_MODEM_COUNT 8
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#define IPA_ROUTE_AP_MIN IPA_ROUTE_MODEM_COUNT
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#define IPA_ROUTE_AP_COUNT \
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(IPA_ROUTE_COUNT_MAX - IPA_ROUTE_MODEM_COUNT)
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/* Filter or route rules consist of a set of 32-bit values followed by a
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* 32-bit all-zero rule list terminator. The "zero rule" is simply an
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* all-zero rule followed by the list terminator.
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*/
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#define IPA_ZERO_RULE_SIZE (2 * sizeof(__le32))
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#ifdef IPA_VALIDATE
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/* Check things that can be validated at build time. */
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static void ipa_table_validate_build(void)
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{
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/* IPA hardware accesses memory 128 bytes at a time. Addresses
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* referred to by entries in filter and route tables must be
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* aligned on 128-byte byte boundaries. The only rule address
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* ever use is the "zero rule", and it's aligned at the base
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* of a coherent DMA allocation.
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*/
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BUILD_BUG_ON(ARCH_DMA_MINALIGN % IPA_TABLE_ALIGN);
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/* Filter and route tables contain DMA addresses that refer to
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* filter or route rules. We use a fixed constant to represent
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* the size of either type of table entry. Code in ipa_table_init()
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* uses a pointer to __le64 to initialize table entriews.
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*/
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BUILD_BUG_ON(IPA_TABLE_ENTRY_SIZE != sizeof(dma_addr_t));
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BUILD_BUG_ON(sizeof(dma_addr_t) != sizeof(__le64));
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/* A "zero rule" is used to represent no filtering or no routing.
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* It is a 64-bit block of zeroed memory. Code in ipa_table_init()
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* assumes that it can be written using a pointer to __le64.
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*/
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BUILD_BUG_ON(IPA_ZERO_RULE_SIZE != sizeof(__le64));
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/* Impose a practical limit on the number of routes */
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BUILD_BUG_ON(IPA_ROUTE_COUNT_MAX > 32);
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/* The modem must be allotted at least one route table entry */
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BUILD_BUG_ON(!IPA_ROUTE_MODEM_COUNT);
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/* But it can't have more than what is available */
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BUILD_BUG_ON(IPA_ROUTE_MODEM_COUNT > IPA_ROUTE_COUNT_MAX);
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}
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static bool
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ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
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{
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struct device *dev = &ipa->pdev->dev;
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const struct ipa_mem *mem;
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u32 size;
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if (route) {
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if (ipv6)
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mem = hashed ? &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]
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: &ipa->mem[IPA_MEM_V6_ROUTE];
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else
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mem = hashed ? &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]
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: &ipa->mem[IPA_MEM_V4_ROUTE];
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size = IPA_ROUTE_COUNT_MAX * IPA_TABLE_ENTRY_SIZE;
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} else {
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if (ipv6)
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mem = hashed ? &ipa->mem[IPA_MEM_V6_FILTER_HASHED]
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: &ipa->mem[IPA_MEM_V6_FILTER];
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else
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mem = hashed ? &ipa->mem[IPA_MEM_V4_FILTER_HASHED]
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: &ipa->mem[IPA_MEM_V4_FILTER];
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size = (1 + IPA_FILTER_COUNT_MAX) * IPA_TABLE_ENTRY_SIZE;
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}
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if (!ipa_cmd_table_valid(ipa, mem, route, ipv6, hashed))
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return false;
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/* mem->size >= size is sufficient, but we'll demand more */
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if (mem->size == size)
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return true;
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/* Hashed table regions can be zero size if hashing is not supported */
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if (hashed && !mem->size)
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return true;
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dev_err(dev, "IPv%c %s%s table region size 0x%02x, expected 0x%02x\n",
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ipv6 ? '6' : '4', hashed ? "hashed " : "",
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route ? "route" : "filter", mem->size, size);
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return false;
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}
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/* Verify the filter and route table memory regions are the expected size */
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bool ipa_table_valid(struct ipa *ipa)
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{
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bool valid = true;
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valid = valid && ipa_table_valid_one(ipa, false, false, false);
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valid = valid && ipa_table_valid_one(ipa, false, false, true);
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valid = valid && ipa_table_valid_one(ipa, false, true, false);
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valid = valid && ipa_table_valid_one(ipa, false, true, true);
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valid = valid && ipa_table_valid_one(ipa, true, false, false);
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valid = valid && ipa_table_valid_one(ipa, true, false, true);
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valid = valid && ipa_table_valid_one(ipa, true, true, false);
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valid = valid && ipa_table_valid_one(ipa, true, true, true);
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return valid;
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}
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bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_map)
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{
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struct device *dev = &ipa->pdev->dev;
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u32 count;
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if (!filter_map) {
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dev_err(dev, "at least one filtering endpoint is required\n");
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return false;
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}
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count = hweight32(filter_map);
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if (count > IPA_FILTER_COUNT_MAX) {
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dev_err(dev, "too many filtering endpoints (%u, max %u)\n",
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count, IPA_FILTER_COUNT_MAX);
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return false;
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}
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return true;
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}
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#else /* !IPA_VALIDATE */
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static void ipa_table_validate_build(void)
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{
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}
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#endif /* !IPA_VALIDATE */
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/* Zero entry count means no table, so just return a 0 address */
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static dma_addr_t ipa_table_addr(struct ipa *ipa, bool filter_mask, u16 count)
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{
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u32 skip;
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if (!count)
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return 0;
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/* assert(count <= max_t(u32, IPA_FILTER_COUNT_MAX, IPA_ROUTE_COUNT_MAX)); */
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/* Skip over the zero rule and possibly the filter mask */
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skip = filter_mask ? 1 : 2;
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return ipa->table_addr + skip * sizeof(*ipa->table_virt);
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}
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static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
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u16 first, u16 count, const struct ipa_mem *mem)
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{
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struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
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dma_addr_t addr;
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u32 offset;
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u16 size;
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/* Nothing to do if the table memory regions is empty */
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if (!mem->size)
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return;
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if (filter)
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first++; /* skip over bitmap */
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offset = mem->offset + first * IPA_TABLE_ENTRY_SIZE;
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size = count * IPA_TABLE_ENTRY_SIZE;
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addr = ipa_table_addr(ipa, false, count);
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ipa_cmd_dma_shared_mem_add(trans, offset, size, addr, true);
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}
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/* Reset entries in a single filter table belonging to either the AP or
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* modem to refer to the zero entry. The memory region supplied will be
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* for the IPv4 and IPv6 non-hashed and hashed filter tables.
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*/
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static int
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ipa_filter_reset_table(struct ipa *ipa, const struct ipa_mem *mem, bool modem)
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{
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u32 ep_mask = ipa->filter_map;
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u32 count = hweight32(ep_mask);
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struct gsi_trans *trans;
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enum gsi_ee_id ee_id;
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if (!mem->size)
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return 0;
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trans = ipa_cmd_trans_alloc(ipa, count);
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if (!trans) {
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dev_err(&ipa->pdev->dev,
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"no transaction for %s filter reset\n",
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modem ? "modem" : "AP");
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return -EBUSY;
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}
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ee_id = modem ? GSI_EE_MODEM : GSI_EE_AP;
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while (ep_mask) {
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u32 endpoint_id = __ffs(ep_mask);
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struct ipa_endpoint *endpoint;
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ep_mask ^= BIT(endpoint_id);
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endpoint = &ipa->endpoint[endpoint_id];
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if (endpoint->ee_id != ee_id)
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continue;
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ipa_table_reset_add(trans, true, endpoint_id, 1, mem);
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}
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gsi_trans_commit_wait(trans);
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return 0;
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}
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/* Theoretically, each filter table could have more filter slots to
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* update than the maximum number of commands in a transaction. So
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* we do each table separately.
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*/
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static int ipa_filter_reset(struct ipa *ipa, bool modem)
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{
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int ret;
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ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER], modem);
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if (ret)
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return ret;
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ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER_HASHED],
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modem);
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if (ret)
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return ret;
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ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER], modem);
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if (ret)
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return ret;
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ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER_HASHED],
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modem);
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return ret;
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}
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/* The AP routes and modem routes are each contiguous within the
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* table. We can update each table with a single command, and we
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* won't exceed the per-transaction command limit.
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* */
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static int ipa_route_reset(struct ipa *ipa, bool modem)
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{
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struct gsi_trans *trans;
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u16 first;
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u16 count;
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trans = ipa_cmd_trans_alloc(ipa, 4);
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if (!trans) {
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dev_err(&ipa->pdev->dev,
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"no transaction for %s route reset\n",
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modem ? "modem" : "AP");
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return -EBUSY;
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}
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if (modem) {
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first = IPA_ROUTE_MODEM_MIN;
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count = IPA_ROUTE_MODEM_COUNT;
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} else {
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first = IPA_ROUTE_AP_MIN;
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count = IPA_ROUTE_AP_COUNT;
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}
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ipa_table_reset_add(trans, false, first, count,
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&ipa->mem[IPA_MEM_V4_ROUTE]);
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ipa_table_reset_add(trans, false, first, count,
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&ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);
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ipa_table_reset_add(trans, false, first, count,
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&ipa->mem[IPA_MEM_V6_ROUTE]);
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ipa_table_reset_add(trans, false, first, count,
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&ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);
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gsi_trans_commit_wait(trans);
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return 0;
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}
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void ipa_table_reset(struct ipa *ipa, bool modem)
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{
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struct device *dev = &ipa->pdev->dev;
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const char *ee_name;
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int ret;
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ee_name = modem ? "modem" : "AP";
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/* Report errors, but reset filter and route tables */
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ret = ipa_filter_reset(ipa, modem);
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if (ret)
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dev_err(dev, "error %d resetting filter table for %s\n",
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ret, ee_name);
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ret = ipa_route_reset(ipa, modem);
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if (ret)
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dev_err(dev, "error %d resetting route table for %s\n",
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ret, ee_name);
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}
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int ipa_table_hash_flush(struct ipa *ipa)
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{
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u32 offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);
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struct gsi_trans *trans;
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u32 val;
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/* IPA version 4.2 does not support hashed tables */
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if (ipa->version == IPA_VERSION_4_2)
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return 0;
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trans = ipa_cmd_trans_alloc(ipa, 1);
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if (!trans) {
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dev_err(&ipa->pdev->dev, "no transaction for hash flush\n");
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return -EBUSY;
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}
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val = IPV4_FILTER_HASH_FLUSH | IPV6_FILTER_HASH_FLUSH;
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val |= IPV6_ROUTER_HASH_FLUSH | IPV4_ROUTER_HASH_FLUSH;
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ipa_cmd_register_write_add(trans, offset, val, val, false);
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gsi_trans_commit_wait(trans);
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return 0;
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}
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static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
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enum ipa_cmd_opcode opcode,
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const struct ipa_mem *mem,
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const struct ipa_mem *hash_mem)
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{
|
||||
struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
|
||||
dma_addr_t hash_addr;
|
||||
dma_addr_t addr;
|
||||
u16 hash_count;
|
||||
u16 hash_size;
|
||||
u16 count;
|
||||
u16 size;
|
||||
|
||||
/* The number of filtering endpoints determines number of entries
|
||||
* in the filter table. The hashed and non-hashed filter table
|
||||
* will have the same number of entries. The size of the route
|
||||
* table region determines the number of entries it has.
|
||||
*/
|
||||
if (filter) {
|
||||
count = hweight32(ipa->filter_map);
|
||||
hash_count = hash_mem->size ? count : 0;
|
||||
} else {
|
||||
count = mem->size / IPA_TABLE_ENTRY_SIZE;
|
||||
hash_count = hash_mem->size / IPA_TABLE_ENTRY_SIZE;
|
||||
}
|
||||
size = count * IPA_TABLE_ENTRY_SIZE;
|
||||
hash_size = hash_count * IPA_TABLE_ENTRY_SIZE;
|
||||
|
||||
addr = ipa_table_addr(ipa, filter, count);
|
||||
hash_addr = ipa_table_addr(ipa, filter, hash_count);
|
||||
|
||||
ipa_cmd_table_init_add(trans, opcode, size, mem->offset, addr,
|
||||
hash_size, hash_mem->offset, hash_addr);
|
||||
}
|
||||
|
||||
int ipa_table_setup(struct ipa *ipa)
|
||||
{
|
||||
struct gsi_trans *trans;
|
||||
|
||||
trans = ipa_cmd_trans_alloc(ipa, 4);
|
||||
if (!trans) {
|
||||
dev_err(&ipa->pdev->dev, "no transaction for table setup\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
ipa_table_init_add(trans, false, IPA_CMD_IP_V4_ROUTING_INIT,
|
||||
&ipa->mem[IPA_MEM_V4_ROUTE],
|
||||
&ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);
|
||||
|
||||
ipa_table_init_add(trans, false, IPA_CMD_IP_V6_ROUTING_INIT,
|
||||
&ipa->mem[IPA_MEM_V6_ROUTE],
|
||||
&ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);
|
||||
|
||||
ipa_table_init_add(trans, true, IPA_CMD_IP_V4_FILTER_INIT,
|
||||
&ipa->mem[IPA_MEM_V4_FILTER],
|
||||
&ipa->mem[IPA_MEM_V4_FILTER_HASHED]);
|
||||
|
||||
ipa_table_init_add(trans, true, IPA_CMD_IP_V6_FILTER_INIT,
|
||||
&ipa->mem[IPA_MEM_V6_FILTER],
|
||||
&ipa->mem[IPA_MEM_V6_FILTER_HASHED]);
|
||||
|
||||
gsi_trans_commit_wait(trans);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void ipa_table_teardown(struct ipa *ipa)
|
||||
{
|
||||
/* Nothing to do */ /* XXX Maybe reset the tables? */
|
||||
}
|
||||
|
||||
/**
|
||||
* ipa_filter_tuple_zero() - Zero an endpoint's hashed filter tuple
|
||||
* @endpoint_id: Endpoint whose filter hash tuple should be zeroed
|
||||
*
|
||||
* Endpoint must be for the AP (not modem) and support filtering. Updates
|
||||
* the filter hash values without changing route ones.
|
||||
*/
|
||||
static void ipa_filter_tuple_zero(struct ipa_endpoint *endpoint)
|
||||
{
|
||||
u32 endpoint_id = endpoint->endpoint_id;
|
||||
u32 offset;
|
||||
u32 val;
|
||||
|
||||
offset = IPA_REG_ENDP_FILTER_ROUTER_HSH_CFG_N_OFFSET(endpoint_id);
|
||||
|
||||
val = ioread32(endpoint->ipa->reg_virt + offset);
|
||||
|
||||
/* Zero all filter-related fields, preserving the rest */
|
||||
u32_replace_bits(val, 0, IPA_REG_ENDP_FILTER_HASH_MSK_ALL);
|
||||
|
||||
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
||||
}
|
||||
|
||||
static void ipa_filter_config(struct ipa *ipa, bool modem)
|
||||
{
|
||||
enum gsi_ee_id ee_id = modem ? GSI_EE_MODEM : GSI_EE_AP;
|
||||
u32 ep_mask = ipa->filter_map;
|
||||
|
||||
/* IPA version 4.2 has no hashed route tables */
|
||||
if (ipa->version == IPA_VERSION_4_2)
|
||||
return;
|
||||
|
||||
while (ep_mask) {
|
||||
u32 endpoint_id = __ffs(ep_mask);
|
||||
struct ipa_endpoint *endpoint;
|
||||
|
||||
ep_mask ^= BIT(endpoint_id);
|
||||
|
||||
endpoint = &ipa->endpoint[endpoint_id];
|
||||
if (endpoint->ee_id == ee_id)
|
||||
ipa_filter_tuple_zero(endpoint);
|
||||
}
|
||||
}
|
||||
|
||||
static void ipa_filter_deconfig(struct ipa *ipa, bool modem)
|
||||
{
|
||||
/* Nothing to do */
|
||||
}
|
||||
|
||||
static bool ipa_route_id_modem(u32 route_id)
|
||||
{
|
||||
return route_id >= IPA_ROUTE_MODEM_MIN &&
|
||||
route_id <= IPA_ROUTE_MODEM_MIN + IPA_ROUTE_MODEM_COUNT - 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* ipa_route_tuple_zero() - Zero a hashed route table entry tuple
|
||||
* @route_id: Route table entry whose hash tuple should be zeroed
|
||||
*
|
||||
* Updates the route hash values without changing filter ones.
|
||||
*/
|
||||
static void ipa_route_tuple_zero(struct ipa *ipa, u32 route_id)
|
||||
{
|
||||
u32 offset = IPA_REG_ENDP_FILTER_ROUTER_HSH_CFG_N_OFFSET(route_id);
|
||||
u32 val;
|
||||
|
||||
val = ioread32(ipa->reg_virt + offset);
|
||||
|
||||
/* Zero all route-related fields, preserving the rest */
|
||||
u32_replace_bits(val, 0, IPA_REG_ENDP_ROUTER_HASH_MSK_ALL);
|
||||
|
||||
iowrite32(val, ipa->reg_virt + offset);
|
||||
}
|
||||
|
||||
static void ipa_route_config(struct ipa *ipa, bool modem)
|
||||
{
|
||||
u32 route_id;
|
||||
|
||||
/* IPA version 4.2 has no hashed route tables */
|
||||
if (ipa->version == IPA_VERSION_4_2)
|
||||
return;
|
||||
|
||||
for (route_id = 0; route_id < IPA_ROUTE_COUNT_MAX; route_id++)
|
||||
if (ipa_route_id_modem(route_id) == modem)
|
||||
ipa_route_tuple_zero(ipa, route_id);
|
||||
}
|
||||
|
||||
static void ipa_route_deconfig(struct ipa *ipa, bool modem)
|
||||
{
|
||||
/* Nothing to do */
|
||||
}
|
||||
|
||||
void ipa_table_config(struct ipa *ipa)
|
||||
{
|
||||
ipa_filter_config(ipa, false);
|
||||
ipa_filter_config(ipa, true);
|
||||
ipa_route_config(ipa, false);
|
||||
ipa_route_config(ipa, true);
|
||||
}
|
||||
|
||||
void ipa_table_deconfig(struct ipa *ipa)
|
||||
{
|
||||
ipa_route_deconfig(ipa, true);
|
||||
ipa_route_deconfig(ipa, false);
|
||||
ipa_filter_deconfig(ipa, true);
|
||||
ipa_filter_deconfig(ipa, false);
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize a coherent DMA allocation containing initialized filter and
|
||||
* route table data. This is used when initializing or resetting the IPA
|
||||
* filter or route table.
|
||||
*
|
||||
* The first entry in a filter table contains a bitmap indicating which
|
||||
* endpoints contain entries in the table. In addition to that first entry,
|
||||
* there are at most IPA_FILTER_COUNT_MAX entries that follow. Filter table
|
||||
* entries are 64 bits wide, and (other than the bitmap) contain the DMA
|
||||
* address of a filter rule. A "zero rule" indicates no filtering, and
|
||||
* consists of 64 bits of zeroes. When a filter table is initialized (or
|
||||
* reset) its entries are made to refer to the zero rule.
|
||||
*
|
||||
* Each entry in a route table is the DMA address of a routing rule. For
|
||||
* routing there is also a 64-bit "zero rule" that means no routing, and
|
||||
* when a route table is initialized or reset, its entries are made to refer
|
||||
* to the zero rule. The zero rule is shared for route and filter tables.
|
||||
*
|
||||
* Note that the IPA hardware requires a filter or route rule address to be
|
||||
* aligned on a 128 byte boundary. The coherent DMA buffer we allocate here
|
||||
* has a minimum alignment, and we place the zero rule at the base of that
|
||||
* allocated space. In ipa_table_init() we verify the minimum DMA allocation
|
||||
* meets our requirement.
|
||||
*
|
||||
* +-------------------+
|
||||
* --> | zero rule |
|
||||
* / |-------------------|
|
||||
* | | filter mask |
|
||||
* |\ |-------------------|
|
||||
* | ---- zero rule address | \
|
||||
* |\ |-------------------| |
|
||||
* | ---- zero rule address | | IPA_FILTER_COUNT_MAX
|
||||
* | |-------------------| > or IPA_ROUTE_COUNT_MAX,
|
||||
* | ... | whichever is greater
|
||||
* \ |-------------------| |
|
||||
* ---- zero rule address | /
|
||||
* +-------------------+
|
||||
*/
|
||||
int ipa_table_init(struct ipa *ipa)
|
||||
{
|
||||
u32 count = max_t(u32, IPA_FILTER_COUNT_MAX, IPA_ROUTE_COUNT_MAX);
|
||||
struct device *dev = &ipa->pdev->dev;
|
||||
dma_addr_t addr;
|
||||
__le64 le_addr;
|
||||
__le64 *virt;
|
||||
size_t size;
|
||||
|
||||
ipa_table_validate_build();
|
||||
|
||||
size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE;
|
||||
virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL);
|
||||
if (!virt)
|
||||
return -ENOMEM;
|
||||
|
||||
ipa->table_virt = virt;
|
||||
ipa->table_addr = addr;
|
||||
|
||||
/* First slot is the zero rule */
|
||||
*virt++ = 0;
|
||||
|
||||
/* Next is the filter table bitmap. The "soft" bitmap value
|
||||
* must be converted to the hardware representation by shifting
|
||||
* it left one position. (Bit 0 repesents global filtering,
|
||||
* which is possible but not used.)
|
||||
*/
|
||||
*virt++ = cpu_to_le64((u64)ipa->filter_map << 1);
|
||||
|
||||
/* All the rest contain the DMA address of the zero rule */
|
||||
le_addr = cpu_to_le64(addr);
|
||||
while (count--)
|
||||
*virt++ = le_addr;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void ipa_table_exit(struct ipa *ipa)
|
||||
{
|
||||
u32 count = max_t(u32, 1 + IPA_FILTER_COUNT_MAX, IPA_ROUTE_COUNT_MAX);
|
||||
struct device *dev = &ipa->pdev->dev;
|
||||
size_t size;
|
||||
|
||||
size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE;
|
||||
|
||||
dma_free_coherent(dev, size, ipa->table_virt, ipa->table_addr);
|
||||
ipa->table_addr = 0;
|
||||
ipa->table_virt = NULL;
|
||||
}
|
||||
103
drivers/net/ipa/ipa_table.h
Normal file
103
drivers/net/ipa/ipa_table.h
Normal file
@ -0,0 +1,103 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
|
||||
* Copyright (C) 2019-2020 Linaro Ltd.
|
||||
*/
|
||||
#ifndef _IPA_TABLE_H_
|
||||
#define _IPA_TABLE_H_
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
struct ipa;
|
||||
|
||||
/* The size of a filter or route table entry */
|
||||
#define IPA_TABLE_ENTRY_SIZE sizeof(__le64) /* Holds a physical address */
|
||||
|
||||
/* The maximum number of filter table entries (IPv4, IPv6; hashed or not) */
|
||||
#define IPA_FILTER_COUNT_MAX 14
|
||||
|
||||
/* The maximum number of route table entries (IPv4, IPv6; hashed or not) */
|
||||
#define IPA_ROUTE_COUNT_MAX 15
|
||||
|
||||
#ifdef IPA_VALIDATE
|
||||
|
||||
/**
|
||||
* ipa_table_valid() - Validate route and filter table memory regions
|
||||
* @ipa: IPA pointer
|
||||
|
||||
* @Return: true if all regions are valid, false otherwise
|
||||
*/
|
||||
bool ipa_table_valid(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_filter_map_valid() - Validate a filter table endpoint bitmap
|
||||
* @ipa: IPA pointer
|
||||
*
|
||||
* @Return: true if all regions are valid, false otherwise
|
||||
*/
|
||||
bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_mask);
|
||||
|
||||
#else /* !IPA_VALIDATE */
|
||||
|
||||
static inline bool ipa_table_valid(struct ipa *ipa)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
static inline bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_mask)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
#endif /* !IPA_VALIDATE */
|
||||
|
||||
/**
|
||||
* ipa_table_reset() - Reset filter and route tables entries to "none"
|
||||
* @ipa: IPA pointer
|
||||
* @modem: Whether to reset modem or AP entries
|
||||
*/
|
||||
void ipa_table_reset(struct ipa *ipa, bool modem);
|
||||
|
||||
/**
|
||||
* ipa_table_hash_flush() - Synchronize hashed filter and route updates
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
int ipa_table_hash_flush(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_setup() - Set up filter and route tables
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
int ipa_table_setup(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_teardown() - Inverse of ipa_table_setup()
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
void ipa_table_teardown(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_config() - Configure filter and route tables
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
void ipa_table_config(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_deconfig() - Inverse of ipa_table_config()
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
void ipa_table_deconfig(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_init() - Do early initialization of filter and route tables
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
int ipa_table_init(struct ipa *ipa);
|
||||
|
||||
/**
|
||||
* ipa_table_exit() - Inverse of ipa_table_init()
|
||||
* @ipa: IPA pointer
|
||||
*/
|
||||
void ipa_table_exit(struct ipa *ipa);
|
||||
|
||||
#endif /* _IPA_TABLE_H_ */
|
||||
Loading…
Reference in New Issue
Block a user