sfc/siena: Remove build references to missing functionality

Functionality not supported or needed on Siena includes:
- Anything for EF100
- EF10 specifics such as register access, PIO and TSO offload.
Also only bind to Siena NICs.

Remove EF10 specifics from nic.h.
The functions that start with efx_farch_ will be removed from sfc.ko
with a subsequent patch.
Add the efx_ prefix to siena_prepare_flush() to make it consistent
with the other APIs.

Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 5 insertions, 204 deletions

diff --git a/drivers/net/ethernet/sfc/siena/tx.c b/drivers/net/ethernet/sfc/siena/tx.c
index 138bca611341..9e68dc434832 100644
--- a/drivers/net/ethernet/sfc/siena/tx.c
+++ b/drivers/net/ethernet/sfc/siena/tx.c
@@ -22,14 +22,6 @@
 #include "tx.h"
 #include "tx_common.h"
 #include "workarounds.h"
-#include "ef10_regs.h"
-
-#ifdef EFX_USE_PIO
-
-#define EFX_PIOBUF_SIZE_DEF ALIGN(256, L1_CACHE_BYTES)
-unsigned int efx_piobuf_size __read_mostly = EFX_PIOBUF_SIZE_DEF;
-
-#endif /* EFX_USE_PIO */
 
 static inline u8 *efx_tx_get_copy_buffer(struct efx_tx_queue *tx_queue,
 					 struct efx_tx_buffer *buffer)
@@ -123,173 +115,6 @@ static int efx_enqueue_skb_copy(struct efx_tx_queue *tx_queue,
 	return rc;
 }
 
-#ifdef EFX_USE_PIO
-
-struct efx_short_copy_buffer {
-	int used;
-	u8 buf[L1_CACHE_BYTES];
-};
-
-/* Copy to PIO, respecting that writes to PIO buffers must be dword aligned.
- * Advances piobuf pointer. Leaves additional data in the copy buffer.
- */
-static void efx_memcpy_toio_aligned(struct efx_nic *efx, u8 __iomem **piobuf,
-				    u8 *data, int len,
-				    struct efx_short_copy_buffer *copy_buf)
-{
-	int block_len = len & ~(sizeof(copy_buf->buf) - 1);
-
-	__iowrite64_copy(*piobuf, data, block_len >> 3);
-	*piobuf += block_len;
-	len -= block_len;
-
-	if (len) {
-		data += block_len;
-		BUG_ON(copy_buf->used);
-		BUG_ON(len > sizeof(copy_buf->buf));
-		memcpy(copy_buf->buf, data, len);
-		copy_buf->used = len;
-	}
-}
-
-/* Copy to PIO, respecting dword alignment, popping data from copy buffer first.
- * Advances piobuf pointer. Leaves additional data in the copy buffer.
- */
-static void efx_memcpy_toio_aligned_cb(struct efx_nic *efx, u8 __iomem **piobuf,
-				       u8 *data, int len,
-				       struct efx_short_copy_buffer *copy_buf)
-{
-	if (copy_buf->used) {
-		/* if the copy buffer is partially full, fill it up and write */
-		int copy_to_buf =
-			min_t(int, sizeof(copy_buf->buf) - copy_buf->used, len);
-
-		memcpy(copy_buf->buf + copy_buf->used, data, copy_to_buf);
-		copy_buf->used += copy_to_buf;
-
-		/* if we didn't fill it up then we're done for now */
-		if (copy_buf->used < sizeof(copy_buf->buf))
-			return;
-
-		__iowrite64_copy(*piobuf, copy_buf->buf,
-				 sizeof(copy_buf->buf) >> 3);
-		*piobuf += sizeof(copy_buf->buf);
-		data += copy_to_buf;
-		len -= copy_to_buf;
-		copy_buf->used = 0;
-	}
-
-	efx_memcpy_toio_aligned(efx, piobuf, data, len, copy_buf);
-}
-
-static void efx_flush_copy_buffer(struct efx_nic *efx, u8 __iomem *piobuf,
-				  struct efx_short_copy_buffer *copy_buf)
-{
-	/* if there's anything in it, write the whole buffer, including junk */
-	if (copy_buf->used)
-		__iowrite64_copy(piobuf, copy_buf->buf,
-				 sizeof(copy_buf->buf) >> 3);
-}
-
-/* Traverse skb structure and copy fragments in to PIO buffer.
- * Advances piobuf pointer.
- */
-static void efx_skb_copy_bits_to_pio(struct efx_nic *efx, struct sk_buff *skb,
-				     u8 __iomem **piobuf,
-				     struct efx_short_copy_buffer *copy_buf)
-{
-	int i;
-
-	efx_memcpy_toio_aligned(efx, piobuf, skb->data, skb_headlen(skb),
-				copy_buf);
-
-	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
-		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
-		u8 *vaddr;
-
-		vaddr = kmap_atomic(skb_frag_page(f));
-
-		efx_memcpy_toio_aligned_cb(efx, piobuf, vaddr + skb_frag_off(f),
-					   skb_frag_size(f), copy_buf);
-		kunmap_atomic(vaddr);
-	}
-
-	EFX_WARN_ON_ONCE_PARANOID(skb_shinfo(skb)->frag_list);
-}
-
-static int efx_enqueue_skb_pio(struct efx_tx_queue *tx_queue,
-			       struct sk_buff *skb)
-{
-	struct efx_tx_buffer *buffer =
-		efx_tx_queue_get_insert_buffer(tx_queue);
-	u8 __iomem *piobuf = tx_queue->piobuf;
-
-	/* Copy to PIO buffer. Ensure the writes are padded to the end
-	 * of a cache line, as this is required for write-combining to be
-	 * effective on at least x86.
-	 */
-
-	if (skb_shinfo(skb)->nr_frags) {
-		/* The size of the copy buffer will ensure all writes
-		 * are the size of a cache line.
-		 */
-		struct efx_short_copy_buffer copy_buf;
-
-		copy_buf.used = 0;
-
-		efx_skb_copy_bits_to_pio(tx_queue->efx, skb,
-					 &piobuf, &copy_buf);
-		efx_flush_copy_buffer(tx_queue->efx, piobuf, &copy_buf);
-	} else {
-		/* Pad the write to the size of a cache line.
-		 * We can do this because we know the skb_shared_info struct is
-		 * after the source, and the destination buffer is big enough.
-		 */
-		BUILD_BUG_ON(L1_CACHE_BYTES >
-			     SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
-		__iowrite64_copy(tx_queue->piobuf, skb->data,
-				 ALIGN(skb->len, L1_CACHE_BYTES) >> 3);
-	}
-
-	buffer->skb = skb;
-	buffer->flags = EFX_TX_BUF_SKB | EFX_TX_BUF_OPTION;
-
-	EFX_POPULATE_QWORD_5(buffer->option,
-			     ESF_DZ_TX_DESC_IS_OPT, 1,
-			     ESF_DZ_TX_OPTION_TYPE, ESE_DZ_TX_OPTION_DESC_PIO,
-			     ESF_DZ_TX_PIO_CONT, 0,
-			     ESF_DZ_TX_PIO_BYTE_CNT, skb->len,
-			     ESF_DZ_TX_PIO_BUF_ADDR,
-			     tx_queue->piobuf_offset);
-	++tx_queue->insert_count;
-	return 0;
-}
-
-/* Decide whether we can use TX PIO, ie. write packet data directly into
- * a buffer on the device.  This can reduce latency at the expense of
- * throughput, so we only do this if both hardware and software TX rings
- * are empty, including all queues for the channel.  This also ensures that
- * only one packet at a time can be using the PIO buffer. If the xmit_more
- * flag is set then we don't use this - there'll be another packet along
- * shortly and we want to hold off the doorbell.
- */
-static bool efx_tx_may_pio(struct efx_tx_queue *tx_queue)
-{
-	struct efx_channel *channel = tx_queue->channel;
-
-	if (!tx_queue->piobuf)
-		return false;
-
-	EFX_WARN_ON_ONCE_PARANOID(!channel->efx->type->option_descriptors);
-
-	efx_for_each_channel_tx_queue(tx_queue, channel)
-		if (!efx_nic_tx_is_empty(tx_queue, tx_queue->packet_write_count))
-			return false;
-
-	return true;
-}
-#endif /* EFX_USE_PIO */
-
 /* Send any pending traffic for a channel. xmit_more is shared across all
  * queues for a channel, so we must check all of them.
  */
@@ -338,35 +163,11 @@ netdev_tx_t __efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb
 	 * size limit.
 	 */
 	if (segments) {
-		switch (tx_queue->tso_version) {
-		case 1:
-			rc = efx_enqueue_skb_tso(tx_queue, skb, &data_mapped);
-			break;
-		case 2:
-			rc = efx_ef10_tx_tso_desc(tx_queue, skb, &data_mapped);
-			break;
-		case 0: /* No TSO on this queue, SW fallback needed */
-		default:
-			rc = -EINVAL;
-			break;
-		}
-		if (rc == -EINVAL) {
-			rc = efx_tx_tso_fallback(tx_queue, skb);
-			tx_queue->tso_fallbacks++;
-			if (rc == 0)
-				return 0;
-		}
-		if (rc)
-			goto err;
-#ifdef EFX_USE_PIO
-	} else if (skb_len <= efx_piobuf_size && !xmit_more &&
-		   efx_tx_may_pio(tx_queue)) {
-		/* Use PIO for short packets with an empty queue. */
-		if (efx_enqueue_skb_pio(tx_queue, skb))
-			goto err;
-		tx_queue->pio_packets++;
-		data_mapped = true;
-#endif
+		rc = efx_tx_tso_fallback(tx_queue, skb);
+		tx_queue->tso_fallbacks++;
+		if (rc == 0)
+			return 0;
+		goto err;
 	} else if (skb->data_len && skb_len <= EFX_TX_CB_SIZE) {
 		/* Pad short packets or coalesce short fragmented packets. */
 		if (efx_enqueue_skb_copy(tx_queue, skb))