static int prep_msg(struct vector_private *vp,
struct sk_buff *skb,
struct iovec *iov)
{
int iov_index = 0;
int nr_frags, frag;
skb_frag_t *skb_frag;
nr_frags = skb_shinfo(skb)->nr_frags;
if (nr_frags > MAX_IOV_SIZE) {
if (skb_linearize(skb) != 0)
goto drop;
}
if (vp->header_size > 0) {
iov[iov_index].iov_len = vp->header_size;
vp->form_header(iov[iov_index].iov_base, skb, vp);
iov_index++;
}
iov[iov_index].iov_base = skb->data;
if (nr_frags > 0) {
iov[iov_index].iov_len = skb->len - skb->data_len;
vp->estats.sg_ok++;
} else
iov[iov_index].iov_len = skb->len;
iov_index++;
for (frag = 0; frag < nr_frags; frag++) {
skb_frag = &skb_shinfo(skb)->frags[frag];
iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
iov[iov_index].iov_len = skb_frag_size(skb_frag);
iov_index++;
}
return iov_index;
drop:
return -1;
}
/* Decide if skb can be inlined in tx descriptor to avoid dma mapping
*
* It seems strange we do not simply use skb_copy_bits().
* This would allow to inline all skbs iff skb->len <= inline_thold
*
* Note that caller already checked skb was not a gso packet
*/
static bool is_inline(int inline_thold, const struct sk_buff *skb,
const struct skb_shared_info *shinfo,
void **pfrag)
{
void *ptr;
if (skb->len > inline_thold || !inline_thold)
return false;
if (shinfo->nr_frags == 1) {
ptr = skb_frag_address_safe(&shinfo->frags[0]);
if (unlikely(!ptr))
return false;
*pfrag = ptr;
return true;
}
if (shinfo->nr_frags)
return false;
return true;
}
static int is_inline(struct sk_buff *skb, void **pfrag)
{
void *ptr;
if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) {
if (skb_shinfo(skb)->nr_frags == 1) {
ptr = skb_frag_address_safe(&skb_shinfo(skb)->frags[0]);
if (unlikely(!ptr))
return 0;
if (pfrag)
*pfrag = ptr;
return 1;
} else if (unlikely(skb_shinfo(skb)->nr_frags))
return 0;
else
return 1;
}
return 0;
}
static void wil_seq_print_skb(struct seq_file *s, struct sk_buff *skb)
{
int i = 0;
int len = skb_headlen(skb);
void *p = skb->data;
int nr_frags = skb_shinfo(skb)->nr_frags;
seq_printf(s, " len = %d\n", len);
wil_seq_hexdump(s, p, len, " : ");
if (nr_frags) {
seq_printf(s, " nr_frags = %d\n", nr_frags);
for (i = 0; i < nr_frags; i++) {
const struct skb_frag_struct *frag =
&skb_shinfo(skb)->frags[i];
len = skb_frag_size(frag);
p = skb_frag_address_safe(frag);
seq_printf(s, " [%2d] : len = %d\n", i, len);
wil_seq_hexdump(s, p, len, " : ");
}
}
}
