skb_copy_ubufs (9) Linux Manual Page
skb_copy_ubufs – copy userspace skb frags buffers to kernel
Synopsis
int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);Arguments
skb
-
- the skb to modify
gfp_mask
- allocation priority
Description
This must be called on SKBTX_DEV_ZEROCOPY skb. It will copy all frags into kernel and drop the reference to userspace pages.
If this function is called from an interrupt gfp_mask must be GFP_ATOMIC.
Returns 0 on success or a negative error code on failure to allocate kernel memory to copy to.