From: Johannes Berg Date: Mon, 5 Mar 2012 19:24:40 +0000 (-0800) Subject: iwlwifi: refactor PCI-E RX path X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=df2f3216ccde52bb43df78e0b869a0dd1637cf15;p=linux-beck.git iwlwifi: refactor PCI-E RX path Just make the code easier to read with less indentation. Signed-off-by: Johannes Berg Signed-off-by: Wey-Yi Guy Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c index 68e89be60bef..bf560e9f87b7 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c @@ -358,6 +358,113 @@ void iwl_bg_rx_replenish(struct work_struct *data) iwlagn_rx_replenish(trans_pcie->trans); } +static void iwl_rx_handle_rxbuf(struct iwl_trans *trans, + struct iwl_rx_mem_buffer *rxb) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + struct iwl_rx_queue *rxq = &trans_pcie->rxq; + struct iwl_tx_queue *txq = &trans_pcie->txq[trans->shrd->cmd_queue]; + struct iwl_device_cmd *cmd; + unsigned long flags; + int len, err; + u16 sequence; + struct iwl_rx_cmd_buffer rxcb; + struct iwl_rx_packet *pkt; + bool reclaim; + int index, cmd_index; + + if (WARN_ON(!rxb)) + return; + + dma_unmap_page(trans->dev, rxb->page_dma, + PAGE_SIZE << hw_params(trans).rx_page_order, + DMA_FROM_DEVICE); + + rxcb._page = rxb->page; + pkt = rxb_addr(&rxcb); + + IWL_DEBUG_RX(trans, "%s, 0x%02x\n", + get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd); + + + len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; + len += sizeof(u32); /* account for status word */ + trace_iwlwifi_dev_rx(priv(trans), pkt, len); + + /* Reclaim a command buffer only if this packet is a response + * to a (driver-originated) command. + * If the packet (e.g. Rx frame) originated from uCode, + * there is no command buffer to reclaim. + * Ucode should set SEQ_RX_FRAME bit if ucode-originated, + * but apparently a few don't get set; catch them here. */ + reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME) && + (pkt->hdr.cmd != REPLY_RX_PHY_CMD) && + (pkt->hdr.cmd != REPLY_RX) && + (pkt->hdr.cmd != REPLY_RX_MPDU_CMD) && + (pkt->hdr.cmd != REPLY_COMPRESSED_BA) && + (pkt->hdr.cmd != STATISTICS_NOTIFICATION) && + (pkt->hdr.cmd != REPLY_TX); + + sequence = le16_to_cpu(pkt->hdr.sequence); + index = SEQ_TO_INDEX(sequence); + cmd_index = get_cmd_index(&txq->q, index); + + if (reclaim) + cmd = txq->cmd[cmd_index]; + else + cmd = NULL; + + /* warn if this is cmd response / notification and the uCode + * didn't set the SEQ_RX_FRAME for a frame that is + * uCode-originated + * If you saw this code after the second half of 2012, then + * please remove it + */ + WARN(pkt->hdr.cmd != REPLY_TX && reclaim == false && + (!(pkt->hdr.sequence & SEQ_RX_FRAME)), + "reclaim is false, SEQ_RX_FRAME unset: %s\n", + get_cmd_string(pkt->hdr.cmd)); + + err = iwl_op_mode_rx(trans->op_mode, &rxcb, cmd); + + /* + * XXX: After here, we should always check rxcb._page + * against NULL before touching it or its virtual + * memory (pkt). Because some rx_handler might have + * already taken or freed the pages. + */ + + if (reclaim) { + /* Invoke any callbacks, transfer the buffer to caller, + * and fire off the (possibly) blocking + * iwl_trans_send_cmd() + * as we reclaim the driver command queue */ + if (rxcb._page) + iwl_tx_cmd_complete(trans, &rxcb, err); + else + IWL_WARN(trans, "Claim null rxb?\n"); + } + + /* page was stolen from us */ + if (rxcb._page == NULL) + rxb->page = NULL; + + /* Reuse the page if possible. For notification packets and + * SKBs that fail to Rx correctly, add them back into the + * rx_free list for reuse later. */ + spin_lock_irqsave(&rxq->lock, flags); + if (rxb->page != NULL) { + rxb->page_dma = + dma_map_page(trans->dev, rxb->page, 0, + PAGE_SIZE << hw_params(trans).rx_page_order, + DMA_FROM_DEVICE); + list_add_tail(&rxb->list, &rxq->rx_free); + rxq->free_count++; + } else + list_add_tail(&rxb->list, &rxq->rx_used); + spin_unlock_irqrestore(&rxq->lock, flags); +} + /** * iwl_rx_handle - Main entry function for receiving responses from uCode * @@ -367,18 +474,12 @@ void iwl_bg_rx_replenish(struct work_struct *data) */ static void iwl_rx_handle(struct iwl_trans *trans) { - struct iwl_trans_pcie *trans_pcie = - IWL_TRANS_GET_PCIE_TRANS(trans); + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_rx_queue *rxq = &trans_pcie->rxq; - struct iwl_tx_queue *txq = &trans_pcie->txq[trans->shrd->cmd_queue]; - struct iwl_device_cmd *cmd; u32 r, i; - int reclaim; - unsigned long flags; u8 fill_rx = 0; u32 count = 8; int total_empty; - int index, cmd_index; /* uCode's read index (stored in shared DRAM) indicates the last Rx * buffer that the driver may process (last buffer filled by ucode). */ @@ -398,111 +499,14 @@ static void iwl_rx_handle(struct iwl_trans *trans) fill_rx = 1; while (i != r) { - int len, err; - u16 sequence; struct iwl_rx_mem_buffer *rxb; - struct iwl_rx_cmd_buffer rxcb; - struct iwl_rx_packet *pkt; rxb = rxq->queue[i]; - - /* If an RXB doesn't have a Rx queue slot associated with it, - * then a bug has been introduced in the queue refilling - * routines -- catch it here */ - if (WARN_ON(rxb == NULL)) { - i = (i + 1) & RX_QUEUE_MASK; - continue; - } - rxq->queue[i] = NULL; - dma_unmap_page(trans->dev, rxb->page_dma, - PAGE_SIZE << hw_params(trans).rx_page_order, - DMA_FROM_DEVICE); - - rxcb._page = rxb->page; - pkt = rxb_addr(&rxcb); - - IWL_DEBUG_RX(trans, "r = %d, i = %d, %s, 0x%02x\n", r, - i, get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd); - - len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; - len += sizeof(u32); /* account for status word */ - trace_iwlwifi_dev_rx(priv(trans), pkt, len); - - /* Reclaim a command buffer only if this packet is a response - * to a (driver-originated) command. - * If the packet (e.g. Rx frame) originated from uCode, - * there is no command buffer to reclaim. - * Ucode should set SEQ_RX_FRAME bit if ucode-originated, - * but apparently a few don't get set; catch them here. */ - reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME) && - (pkt->hdr.cmd != REPLY_RX_PHY_CMD) && - (pkt->hdr.cmd != REPLY_RX) && - (pkt->hdr.cmd != REPLY_RX_MPDU_CMD) && - (pkt->hdr.cmd != REPLY_COMPRESSED_BA) && - (pkt->hdr.cmd != STATISTICS_NOTIFICATION) && - (pkt->hdr.cmd != REPLY_TX); - - sequence = le16_to_cpu(pkt->hdr.sequence); - index = SEQ_TO_INDEX(sequence); - cmd_index = get_cmd_index(&txq->q, index); - - if (reclaim) - cmd = txq->cmd[cmd_index]; - else - cmd = NULL; - - /* warn if this is cmd response / notification and the uCode - * didn't set the SEQ_RX_FRAME for a frame that is - * uCode-originated - * If you saw this code after the second half of 2012, then - * please remove it - */ - WARN(pkt->hdr.cmd != REPLY_TX && reclaim == false && - (!(pkt->hdr.sequence & SEQ_RX_FRAME)), - "reclaim is false, SEQ_RX_FRAME unset: %s\n", - get_cmd_string(pkt->hdr.cmd)); - - err = iwl_op_mode_rx(trans->op_mode, &rxcb, cmd); - - /* - * XXX: After here, we should always check rxcb._page - * against NULL before touching it or its virtual - * memory (pkt). Because some rx_handler might have - * already taken or freed the pages. - */ - - if (reclaim) { - /* Invoke any callbacks, transfer the buffer to caller, - * and fire off the (possibly) blocking - * iwl_trans_send_cmd() - * as we reclaim the driver command queue */ - if (rxcb._page) - iwl_tx_cmd_complete(trans, &rxcb, err); - else - IWL_WARN(trans, "Claim null rxb?\n"); - } - - /* page was stolen from us */ - if (rxcb._page == NULL) - rxb->page = NULL; + IWL_DEBUG_RX(trans, "rxbuf: r = %d, i = %d (%p)\n", rxb); - /* Reuse the page if possible. For notification packets and - * SKBs that fail to Rx correctly, add them back into the - * rx_free list for reuse later. */ - spin_lock_irqsave(&rxq->lock, flags); - if (rxb->page != NULL) { - rxb->page_dma = dma_map_page(trans->dev, rxb->page, - 0, PAGE_SIZE << - hw_params(trans).rx_page_order, - DMA_FROM_DEVICE); - list_add_tail(&rxb->list, &rxq->rx_free); - rxq->free_count++; - } else - list_add_tail(&rxb->list, &rxq->rx_used); - - spin_unlock_irqrestore(&rxq->lock, flags); + iwl_rx_handle_rxbuf(trans, rxb); i = (i + 1) & RX_QUEUE_MASK; /* If there are a lot of unused frames,