[PATCH v2 12/13] qtnfmac: drop redundant data copy in control path

[Sergey Matyukevich]

Command responses and events from the firmware are copied twice in
control path: at first in shm core (qtnf_shm_handle_new_data) and
then in pcie bus drivers (qtnf_pcie_control_rx_callback). There
is no need to copy this data twice, it can be done only once
in rx callbacks.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich...@quantenna.com>
---
 drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c |  5 +++--
 drivers/net/wireless/quantenna/qtnfmac/shm_ipc.c   | 13 ++++++-------
 drivers/net/wireless/quantenna/qtnfmac/shm_ipc.h   |  4 +---
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c 
b/drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c
index d1637f2354a6..16795dbe475b 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c
@@ -242,7 +242,8 @@ static int qtnf_pcie_init_memory(struct qtnf_pcie_bus_priv 
*priv)
        return 0;
 }
 
-static void qtnf_pcie_control_rx_callback(void *arg, const u8 *buf, size_t len)
+static void qtnf_pcie_control_rx_callback(void *arg, const u8 __iomem *buf,
+                                         size_t len)
 {
        struct qtnf_pcie_bus_priv *priv = arg;
        struct qtnf_bus *bus = pci_get_drvdata(priv->pdev);
@@ -260,7 +261,7 @@ static void qtnf_pcie_control_rx_callback(void *arg, const 
u8 *buf, size_t len)
                return;
        }
 
-       skb_put_data(skb, buf, len);
+       memcpy_fromio(skb_put(skb, len), buf, len);
 
        qtnf_trans_handle_rx_ctl_packet(bus, skb);
 }
diff --git a/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.c 
b/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.c
index aa106dd0a14b..2ec334199c2b 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.c
@@ -42,19 +42,18 @@ static void qtnf_shm_handle_new_data(struct qtnf_shm_ipc 
*ipc)
        if (unlikely(size == 0 || size > QTN_IPC_MAX_DATA_SZ)) {
                pr_err("wrong rx packet size: %zu\n", size);
                rx_buff_ok = false;
-       } else {
-               memcpy_fromio(ipc->rx_data, ipc->shm_region->data, size);
+       }
+
+       if (likely(rx_buff_ok)) {
+               ipc->rx_packet_count++;
+               ipc->rx_callback.fn(ipc->rx_callback.arg,
+                                   ipc->shm_region->data, size);
        }
 
        writel(QTNF_SHM_IPC_ACK, &shm_reg_hdr->flags);
        readl(&shm_reg_hdr->flags); /* flush PCIe write */
 
        ipc->interrupt.fn(ipc->interrupt.arg);
-
-       if (likely(rx_buff_ok)) {
-               ipc->rx_packet_count++;
-               ipc->rx_callback.fn(ipc->rx_callback.arg, ipc->rx_data, size);
-       }
 }
 
 static void qtnf_shm_ipc_irq_work(struct work_struct *work)
diff --git a/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.h 
b/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.h
index 453dd6477b12..c2a3702a9ee7 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.h
+++ b/drivers/net/wireless/quantenna/qtnfmac/shm_ipc.h
@@ -32,7 +32,7 @@ struct qtnf_shm_ipc_int {
 };
 
 struct qtnf_shm_ipc_rx_callback {
-       void (*fn)(void *arg, const u8 *buf, size_t len);
+       void (*fn)(void *arg, const u8 __iomem *buf, size_t len);
        void *arg;
 };
 
@@ -51,8 +51,6 @@ struct qtnf_shm_ipc {
 
        u8 waiting_for_ack;
 
-       u8 rx_data[QTN_IPC_MAX_DATA_SZ] __aligned(sizeof(u32));
-
        struct qtnf_shm_ipc_int interrupt;
        struct qtnf_shm_ipc_rx_callback rx_callback;
 
-- 
2.11.0