260 lines
7.2 KiB
C
260 lines
7.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (C) 2017 Intel Deutschland GmbH
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* Copyright (C) 2018-2020 Intel Corporation
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*/
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#include <net/tso.h>
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#include <linux/tcp.h>
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#include "iwl-debug.h"
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#include "iwl-csr.h"
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#include "iwl-io.h"
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#include "internal.h"
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#include "fw/api/tx.h"
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#include "queue/tx.h"
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/*************** HOST COMMAND QUEUE FUNCTIONS *****/
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/*
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* iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
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* @priv: device private data point
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* @cmd: a pointer to the ucode command structure
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*
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* The function returns < 0 values to indicate the operation
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* failed. On success, it returns the index (>= 0) of command in the
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* command queue.
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*/
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int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
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struct iwl_host_cmd *cmd)
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{
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struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
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struct iwl_txq *txq = trans->txqs.txq[trans->txqs.cmd.q_id];
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struct iwl_device_cmd *out_cmd;
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struct iwl_cmd_meta *out_meta;
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void *dup_buf = NULL;
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dma_addr_t phys_addr;
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int i, cmd_pos, idx;
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u16 copy_size, cmd_size, tb0_size;
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bool had_nocopy = false;
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u8 group_id = iwl_cmd_groupid(cmd->id);
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const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
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u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
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struct iwl_tfh_tfd *tfd;
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unsigned long flags;
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copy_size = sizeof(struct iwl_cmd_header_wide);
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cmd_size = sizeof(struct iwl_cmd_header_wide);
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for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
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cmddata[i] = cmd->data[i];
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cmdlen[i] = cmd->len[i];
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if (!cmd->len[i])
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continue;
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/* need at least IWL_FIRST_TB_SIZE copied */
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if (copy_size < IWL_FIRST_TB_SIZE) {
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int copy = IWL_FIRST_TB_SIZE - copy_size;
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if (copy > cmdlen[i])
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copy = cmdlen[i];
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cmdlen[i] -= copy;
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cmddata[i] += copy;
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copy_size += copy;
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}
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if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
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had_nocopy = true;
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if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
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idx = -EINVAL;
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goto free_dup_buf;
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}
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} else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
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/*
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* This is also a chunk that isn't copied
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* to the static buffer so set had_nocopy.
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*/
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had_nocopy = true;
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/* only allowed once */
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if (WARN_ON(dup_buf)) {
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idx = -EINVAL;
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goto free_dup_buf;
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}
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dup_buf = kmemdup(cmddata[i], cmdlen[i],
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GFP_ATOMIC);
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if (!dup_buf)
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return -ENOMEM;
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} else {
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/* NOCOPY must not be followed by normal! */
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if (WARN_ON(had_nocopy)) {
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idx = -EINVAL;
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goto free_dup_buf;
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}
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copy_size += cmdlen[i];
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}
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cmd_size += cmd->len[i];
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}
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/*
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* If any of the command structures end up being larger than the
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* TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
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* separate TFDs, then we will need to increase the size of the buffers
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*/
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if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
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"Command %s (%#x) is too large (%d bytes)\n",
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iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
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idx = -EINVAL;
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goto free_dup_buf;
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}
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spin_lock_irqsave(&txq->lock, flags);
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idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
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tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
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memset(tfd, 0, sizeof(*tfd));
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if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
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spin_unlock_irqrestore(&txq->lock, flags);
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IWL_ERR(trans, "No space in command queue\n");
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iwl_op_mode_cmd_queue_full(trans->op_mode);
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idx = -ENOSPC;
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goto free_dup_buf;
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}
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out_cmd = txq->entries[idx].cmd;
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out_meta = &txq->entries[idx].meta;
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/* re-initialize to NULL */
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memset(out_meta, 0, sizeof(*out_meta));
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if (cmd->flags & CMD_WANT_SKB)
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out_meta->source = cmd;
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/* set up the header */
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out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
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out_cmd->hdr_wide.group_id = group_id;
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out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
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out_cmd->hdr_wide.length =
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cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
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out_cmd->hdr_wide.reserved = 0;
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out_cmd->hdr_wide.sequence =
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cpu_to_le16(QUEUE_TO_SEQ(trans->txqs.cmd.q_id) |
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INDEX_TO_SEQ(txq->write_ptr));
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cmd_pos = sizeof(struct iwl_cmd_header_wide);
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copy_size = sizeof(struct iwl_cmd_header_wide);
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/* and copy the data that needs to be copied */
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for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
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int copy;
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if (!cmd->len[i])
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continue;
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/* copy everything if not nocopy/dup */
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if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
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IWL_HCMD_DFL_DUP))) {
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copy = cmd->len[i];
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memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
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cmd_pos += copy;
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copy_size += copy;
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continue;
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}
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/*
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* Otherwise we need at least IWL_FIRST_TB_SIZE copied
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* in total (for bi-directional DMA), but copy up to what
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* we can fit into the payload for debug dump purposes.
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*/
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copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
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memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
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cmd_pos += copy;
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/* However, treat copy_size the proper way, we need it below */
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if (copy_size < IWL_FIRST_TB_SIZE) {
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copy = IWL_FIRST_TB_SIZE - copy_size;
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if (copy > cmd->len[i])
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copy = cmd->len[i];
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copy_size += copy;
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}
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}
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IWL_DEBUG_HC(trans,
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"Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
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iwl_get_cmd_string(trans, cmd->id), group_id,
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out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
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cmd_size, txq->write_ptr, idx, trans->txqs.cmd.q_id);
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/* start the TFD with the minimum copy bytes */
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tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
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memcpy(&txq->first_tb_bufs[idx], out_cmd, tb0_size);
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iwl_txq_gen2_set_tb(trans, tfd, iwl_txq_get_first_tb_dma(txq, idx),
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tb0_size);
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/* map first command fragment, if any remains */
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if (copy_size > tb0_size) {
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phys_addr = dma_map_single(trans->dev,
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(u8 *)out_cmd + tb0_size,
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copy_size - tb0_size,
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DMA_TO_DEVICE);
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if (dma_mapping_error(trans->dev, phys_addr)) {
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idx = -ENOMEM;
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iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
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goto out;
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}
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iwl_txq_gen2_set_tb(trans, tfd, phys_addr,
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copy_size - tb0_size);
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}
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/* map the remaining (adjusted) nocopy/dup fragments */
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for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
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void *data = (void *)(uintptr_t)cmddata[i];
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if (!cmdlen[i])
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continue;
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if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
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IWL_HCMD_DFL_DUP)))
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continue;
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if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
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data = dup_buf;
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phys_addr = dma_map_single(trans->dev, data,
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cmdlen[i], DMA_TO_DEVICE);
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if (dma_mapping_error(trans->dev, phys_addr)) {
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idx = -ENOMEM;
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iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
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goto out;
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}
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iwl_txq_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
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}
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BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
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out_meta->flags = cmd->flags;
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if (WARN_ON_ONCE(txq->entries[idx].free_buf))
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kfree_sensitive(txq->entries[idx].free_buf);
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txq->entries[idx].free_buf = dup_buf;
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trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
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/* start timer if queue currently empty */
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if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
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mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
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spin_lock(&trans_pcie->reg_lock);
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/* Increment and update queue's write index */
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txq->write_ptr = iwl_txq_inc_wrap(trans, txq->write_ptr);
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iwl_txq_inc_wr_ptr(trans, txq);
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spin_unlock(&trans_pcie->reg_lock);
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out:
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spin_unlock_irqrestore(&txq->lock, flags);
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free_dup_buf:
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if (idx < 0)
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kfree(dup_buf);
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return idx;
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}
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