net: netcp: fix unused interface rx buffer size configuration

Prior to this patch, rx buffer size for each rx queue
of an interface is configurable through dts bindings.
But for an interface, the first rx queue's rx buffer
size is always the usual MTU size (plus usual overhead)
and page size for the remaining rx queues (if they are
enabled by specifying a non-zero rx queue depth dts
binding of the corresponding interface).  This patch
removes the rx buffer size configuration capability.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Acked-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ti/netcp.h b/drivers/net/ethernet/ti/netcp.h
index a8a7306..bb1bb72 100644 (file)
--- a/drivers/net/ethernet/ti/netcp.h
+++ b/drivers/net/ethernet/ti/netcp.h
@@ -85,7 +85,6 @@ struct netcp_intf {
        struct list_head        rxhook_list_head;
        unsigned int            rx_queue_id;
        void                    *rx_fdq[KNAV_DMA_FDQ_PER_CHAN];
-       u32                     rx_buffer_sizes[KNAV_DMA_FDQ_PER_CHAN];
        struct napi_struct      rx_napi;
        struct napi_struct      tx_napi;
 

diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c
index 9749dfd..4755838 100644 (file)
--- a/drivers/net/ethernet/ti/netcp_core.c
+++ b/drivers/net/ethernet/ti/netcp_core.c
@@ -34,6 +34,7 @@
 #define NETCP_SOP_OFFSET       (NET_IP_ALIGN + NET_SKB_PAD)
 #define NETCP_NAPI_WEIGHT      64
 #define NETCP_TX_TIMEOUT       (5 * HZ)
+#define NETCP_PACKET_SIZE      (ETH_FRAME_LEN + ETH_FCS_LEN)
 #define NETCP_MIN_PACKET_SIZE  ETH_ZLEN
 #define NETCP_MAX_MCAST_ADDR   16
 
@@ -804,30 +805,28 @@ static void netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
        if (likely(fdq == 0)) {
                unsigned int primary_buf_len;
                /* Allocate a primary receive queue entry */
-               buf_len = netcp->rx_buffer_sizes[0] + NETCP_SOP_OFFSET;
+               buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
                primary_buf_len = SKB_DATA_ALIGN(buf_len) +
                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 
-               if (primary_buf_len <= PAGE_SIZE) {
-                       bufptr = netdev_alloc_frag(primary_buf_len);
-                       pad[1] = primary_buf_len;
-               } else {
-                       bufptr = kmalloc(primary_buf_len, GFP_ATOMIC |
-                                        GFP_DMA32 | __GFP_COLD);
-                       pad[1] = 0;
-               }
+               bufptr = netdev_alloc_frag(primary_buf_len);
+               pad[1] = primary_buf_len;
 
                if (unlikely(!bufptr)) {
-                       dev_warn_ratelimited(netcp->ndev_dev, "Primary RX buffer alloc failed\n");
+                       dev_warn_ratelimited(netcp->ndev_dev,
+                                            "Primary RX buffer alloc failed\n");
                        goto fail;
                }
                dma = dma_map_single(netcp->dev, bufptr, buf_len,
                                     DMA_TO_DEVICE);
+               if (unlikely(dma_mapping_error(netcp->dev, dma)))
+                       goto fail;
+
                pad[0] = (u32)bufptr;
 
        } else {
                /* Allocate a secondary receive queue entry */
-               page = alloc_page(GFP_ATOMIC | GFP_DMA32 | __GFP_COLD);
+               page = alloc_page(GFP_ATOMIC | GFP_DMA | __GFP_COLD);
                if (unlikely(!page)) {
                        dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
                        goto fail;
@@ -1010,7 +1009,7 @@ netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
 
        /* Map the linear buffer */
        dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
-       if (unlikely(!dma_addr)) {
+       if (unlikely(dma_mapping_error(dev, dma_addr))) {
                dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
                return NULL;
        }
@@ -1546,8 +1545,8 @@ static int netcp_setup_navigator_resources(struct net_device *ndev)
        knav_queue_disable_notify(netcp->rx_queue);
 
        /* open Rx FDQs */
-       for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
-            netcp->rx_queue_depths[i] && netcp->rx_buffer_sizes[i]; ++i) {
+       for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
+            ++i) {
                snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
                netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
                if (IS_ERR_OR_NULL(netcp->rx_fdq[i])) {
@@ -1941,14 +1940,6 @@ static int netcp_create_interface(struct netcp_device *netcp_device,
                netcp->rx_queue_depths[0] = 128;
        }
 
-       ret = of_property_read_u32_array(node_interface, "rx-buffer-size",
-                                        netcp->rx_buffer_sizes,
-                                        KNAV_DMA_FDQ_PER_CHAN);
-       if (ret) {
-               dev_err(dev, "missing \"rx-buffer-size\" parameter\n");
-               netcp->rx_buffer_sizes[0] = 1536;
-       }
-
        ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
        if (ret < 0) {
                dev_err(dev, "missing \"rx-pool\" parameter\n");