Merge branch 'gic' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux...

[cascardo/linux.git] / drivers / net / wireless / iwlwifi / pcie / internal.h

diff --git a/drivers/net/wireless/iwlwifi/pcie/internal.h b/drivers/net/wireless/iwlwifi/pcie/internal.h
index aa2a39a..148843e 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/iwlwifi/pcie/internal.h
@@ -137,10 +137,6 @@ static inline int iwl_queue_dec_wrap(int index, int n_bd)
 struct iwl_cmd_meta {
        /* only for SYNC commands, iff the reply skb is wanted */
        struct iwl_host_cmd *source;
-
-       DEFINE_DMA_UNMAP_ADDR(mapping);
-       DEFINE_DMA_UNMAP_LEN(len);
-
        u32 flags;
 };
 
@@ -182,19 +178,39 @@ struct iwl_queue {
 #define TFD_TX_CMD_SLOTS 256
 #define TFD_CMD_SLOTS 32
 
+/*
+ * The FH will write back to the first TB only, so we need
+ * to copy some data into the buffer regardless of whether
+ * it should be mapped or not. This indicates how big the
+ * first TB must be to include the scratch buffer. Since
+ * the scratch is 4 bytes at offset 12, it's 16 now. If we
+ * make it bigger then allocations will be bigger and copy
+ * slower, so that's probably not useful.
+ */
+#define IWL_HCMD_SCRATCHBUF_SIZE       16
+
 struct iwl_pcie_txq_entry {
        struct iwl_device_cmd *cmd;
-       struct iwl_device_cmd *copy_cmd;
        struct sk_buff *skb;
        /* buffer to free after command completes */
        const void *free_buf;
        struct iwl_cmd_meta meta;
 };
 
+struct iwl_pcie_txq_scratch_buf {
+       struct iwl_cmd_header hdr;
+       u8 buf[8];
+       __le32 scratch;
+};
+
 /**
  * struct iwl_txq - Tx Queue for DMA
  * @q: generic Rx/Tx queue descriptor
  * @tfds: transmit frame descriptors (DMA memory)
+ * @scratchbufs: start of command headers, including scratch buffers, for
+ *     the writeback -- this is DMA memory and an array holding one buffer
+ *     for each command on the queue
+ * @scratchbufs_dma: DMA address for the scratchbufs start
  * @entries: transmit entries (driver state)
  * @lock: queue lock
  * @stuck_timer: timer that fires if queue gets stuck
@@ -208,6 +224,8 @@ struct iwl_pcie_txq_entry {
 struct iwl_txq {
        struct iwl_queue q;
        struct iwl_tfd *tfds;
+       struct iwl_pcie_txq_scratch_buf *scratchbufs;
+       dma_addr_t scratchbufs_dma;
        struct iwl_pcie_txq_entry *entries;
        spinlock_t lock;
        struct timer_list stuck_timer;
@@ -216,6 +234,13 @@ struct iwl_txq {
        u8 active;
 };
 
+static inline dma_addr_t
+iwl_pcie_get_scratchbuf_dma(struct iwl_txq *txq, int idx)
+{
+       return txq->scratchbufs_dma +
+              sizeof(struct iwl_pcie_txq_scratch_buf) * idx;
+}
+
 /**
  * struct iwl_trans_pcie - PCIe transport specific data
  * @rxq: all the RX queue data