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path: root/drivers/net/usb/cdc_ncm.c
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Diffstat (limited to 'drivers/net/usb/cdc_ncm.c')
-rw-r--r--drivers/net/usb/cdc_ncm.c70
1 files changed, 50 insertions, 20 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index b5cec1824a78..d103a1d4fb36 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -89,6 +89,8 @@ static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
CDC_NCM_SIMPLE_STAT(rx_ntbs),
};
+#define CDC_NCM_LOW_MEM_MAX_CNT 10
+
static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
{
switch (sset) {
@@ -1017,7 +1019,7 @@ static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remai
if (skb->len + align > max)
align = max - skb->len;
if (align && skb_tailroom(skb) >= align)
- memset(skb_put(skb, align), 0, align);
+ skb_put_zero(skb, align);
}
/* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
@@ -1055,10 +1057,10 @@ static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_
/* align new NDP */
if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
- cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
+ cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
/* verify that there is room for the NDP and the datagram (reserve) */
- if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
+ if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
return NULL;
/* link to it */
@@ -1069,7 +1071,7 @@ static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_
/* push a new empty NDP */
if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
- ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
+ ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
else
ndp16 = ctx->delayed_ndp16;
@@ -1111,16 +1113,44 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
/* allocate a new OUT skb */
if (!skb_out) {
- skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
+ if (ctx->tx_low_mem_val == 0) {
+ ctx->tx_curr_size = ctx->tx_max;
+ skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
+ /* If the memory allocation fails we will wait longer
+ * each time before attempting another full size
+ * allocation again to not overload the system
+ * further.
+ */
+ if (skb_out == NULL) {
+ ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
+ (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
+ ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
+ }
+ }
if (skb_out == NULL) {
- if (skb != NULL) {
- dev_kfree_skb_any(skb);
- dev->net->stats.tx_dropped++;
+ /* See if a very small allocation is possible.
+ * We will send this packet immediately and hope
+ * that there is more memory available later.
+ */
+ if (skb)
+ ctx->tx_curr_size = max(skb->len,
+ (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
+ else
+ ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
+ skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
+
+ /* No allocation possible so we will abort */
+ if (skb_out == NULL) {
+ if (skb != NULL) {
+ dev_kfree_skb_any(skb);
+ dev->net->stats.tx_dropped++;
+ }
+ goto exit_no_skb;
}
- goto exit_no_skb;
+ ctx->tx_low_mem_val--;
}
/* fill out the initial 16-bit NTB header */
- nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
+ nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
@@ -1148,10 +1178,10 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
/* align beginning of next frame */
- cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
+ cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
/* check if we had enough room left for both NDP and frame */
- if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
+ if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
if (n == 0) {
/* won't fit, MTU problem? */
dev_kfree_skb_any(skb);
@@ -1180,7 +1210,7 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
- memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
+ skb_put_data(skb_out, skb->data, skb->len);
ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
dev_kfree_skb_any(skb);
skb = NULL;
@@ -1227,9 +1257,9 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
/* If requested, put NDP at end of frame. */
if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
- cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
+ cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
nth16->wNdpIndex = cpu_to_le16(skb_out->len);
- memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
+ skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
/* Zero out delayed NDP - signature checking will naturally fail. */
ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
@@ -1246,11 +1276,11 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
*/
if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
skb_out->len > ctx->min_tx_pkt) {
- padding_count = ctx->tx_max - skb_out->len;
- memset(skb_put(skb_out, padding_count), 0, padding_count);
- } else if (skb_out->len < ctx->tx_max &&
+ padding_count = ctx->tx_curr_size - skb_out->len;
+ skb_put_zero(skb_out, padding_count);
+ } else if (skb_out->len < ctx->tx_curr_size &&
(skb_out->len % dev->maxpacket) == 0) {
- *skb_put(skb_out, 1) = 0; /* force short packet */
+ skb_put_u8(skb_out, 0); /* force short packet */
}
/* set final frame length */
@@ -1497,7 +1527,7 @@ next_ndp:
skb = netdev_alloc_skb_ip_align(dev->net, len);
if (!skb)
goto error;
- memcpy(skb_put(skb, len), skb_in->data + offset, len);
+ skb_put_data(skb, skb_in->data + offset, len);
usbnet_skb_return(dev, skb);
payload += len; /* count payload bytes in this NTB */
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 10:27:46 +0000