/**
* tso_fill_packet_with_fragment - form descriptors for the current fragment
* @tx_queue: Efx TX queue
* @skb: Socket buffer
* @st: TSO state
*
* Form descriptors for the current fragment, until we reach the end
* of fragment or end-of-packet. Return 0 on success, 1 if not enough
* space in @tx_queue.
*/
static inline int tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue,
const struct sk_buff *skb,
struct tso_state *st)
{
int n, end_of_packet, rc;
if (st->ifc.len == 0)
return 0;
if (st->packet_space == 0)
return 0;
EFX_BUG_ON_PARANOID(st->ifc.len <= 0);
EFX_BUG_ON_PARANOID(st->packet_space <= 0);
n = min(st->ifc.len, st->packet_space);
st->packet_space -= n;
st->remaining_len -= n;
st->ifc.len -= n;
st->ifc.page_off += n;
end_of_packet = st->remaining_len == 0 || st->packet_space == 0;
rc = efx_tx_queue_insert(tx_queue, st->ifc.dma_addr, n,
st->remaining_len ? NULL : skb,
end_of_packet, st->ifc.unmap_addr,
st->ifc.len ? 0 : st->ifc.unmap_len);
st->ifc.dma_addr += n;
return rc;
}
/**
* tso_fill_packet_with_fragment - form descriptors for the current fragment
* @tx_queue: Efx TX queue
* @skb: Socket buffer
* @st: TSO state
*
* Form descriptors for the current fragment, until we reach the end
* of fragment or end-of-packet. Return 0 on success, 1 if not enough
* space in @tx_queue.
*/
static int tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue,
const struct sk_buff *skb,
struct tso_state *st)
{
struct efx_tx_buffer *buffer;
int n, end_of_packet, rc;
if (st->in_len == 0)
return 0;
if (st->packet_space == 0)
return 0;
EFX_BUG_ON_PARANOID(st->in_len <= 0);
EFX_BUG_ON_PARANOID(st->packet_space <= 0);
n = min(st->in_len, st->packet_space);
st->packet_space -= n;
st->out_len -= n;
st->in_len -= n;
rc = efx_tx_queue_insert(tx_queue, st->dma_addr, n, &buffer);
if (likely(rc == 0)) {
if (st->out_len == 0)
/* Transfer ownership of the skb */
buffer->skb = skb;
end_of_packet = st->out_len == 0 || st->packet_space == 0;
buffer->continuation = !end_of_packet;
if (st->in_len == 0) {
/* Transfer ownership of the pci mapping */
buffer->unmap_len = st->unmap_len;
buffer->unmap_single = st->unmap_single;
st->unmap_len = 0;
}
}
st->dma_addr += n;
return rc;
}
/**
* tso_fill_packet_with_fragment - form descriptors for the current fragment
* @tx_queue: Efx TX queue
* @skb: Socket buffer
* @st: TSO state
*
* Form descriptors for the current fragment, until we reach the end
* of fragment or end-of-packet.
*/
static void tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue,
const struct sk_buff *skb,
struct tso_state *st)
{
struct efx_tx_buffer *buffer;
int n;
if (st->in_len == 0)
return;
if (st->packet_space == 0)
return;
EFX_WARN_ON_ONCE_PARANOID(st->in_len <= 0);
EFX_WARN_ON_ONCE_PARANOID(st->packet_space <= 0);
n = min(st->in_len, st->packet_space);
st->packet_space -= n;
st->out_len -= n;
st->in_len -= n;
efx_tx_queue_insert(tx_queue, st->dma_addr, n, &buffer);
if (st->out_len == 0) {
/* Transfer ownership of the skb */
buffer->skb = skb;
buffer->flags = EFX_TX_BUF_SKB;
} else if (st->packet_space != 0) {
buffer->flags = EFX_TX_BUF_CONT;
}
if (st->in_len == 0) {
/* Transfer ownership of the DMA mapping */
buffer->unmap_len = st->unmap_len;
buffer->dma_offset = buffer->unmap_len - buffer->len;
buffer->flags |= st->dma_flags;
st->unmap_len = 0;
}
st->dma_addr += n;
}
