Merge branch 'net-remove-kmap_atomic'

Anirudh Venkataramanan says:

====================
net: Remove uses of kmap_atomic()

kmap_atomic() is being deprecated. This little series replaces the last
few uses of kmap_atomic() in the networking subsystem.

This series triggered a suggestion [1] that perhaps the Sun Cassini,
LDOM Virtual Switch Driver and the LDOM virtual network drivers should be
removed completely. I plan to do this in a follow up patchset. For
completeness, this series still includes kmap_atomic() conversions that
apply to the above referenced drivers. If for some reason we choose to not
remove these drivers, at least they won't be using kmap_atomic() anymore.

Also, the following maintainer entries for the Chelsio driver seem to be
defunct:

  Vinay Kumar Yadav <vinay.yadav@chelsio.com>
  Rohit Maheshwari <rohitm@chelsio.com>

I can submit a follow up patch to remove these entries, but thought
maybe the folks over at Chelsio would want to look into this first.

Changes v1 -> v2:
  Use memcpy_from_page() in patches 2/6 and 4/6
  Add new patch for the thunderbolt driver
  Update commit messages and cover letter
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c

@@ -1839,9 +1839,7 @@ static int chcr_short_record_handler(struct chcr_ktls_info *tx_info,
 		 */
 		if (prior_data_len) {
 			int i = 0;
-			u8 *data = NULL;
 			skb_frag_t *f;
-			u8 *vaddr;
 			int frag_size = 0, frag_delta = 0;
 
 			while (remaining > 0) {
@@ -1853,24 +1851,24 @@ static int chcr_short_record_handler(struct chcr_ktls_info *tx_info,
 				i++;
 			}
 			f = &record->frags[i];
-			vaddr = kmap_atomic(skb_frag_page(f));
-
-			data = vaddr + skb_frag_off(f)  + remaining;
 			frag_delta = skb_frag_size(f) - remaining;
 
 			if (frag_delta >= prior_data_len) {
-				memcpy(prior_data, data, prior_data_len);
-				kunmap_atomic(vaddr);
+				memcpy_from_page(prior_data, skb_frag_page(f),
+						 skb_frag_off(f) + remaining,
+						 prior_data_len);
 			} else {
-				memcpy(prior_data, data, frag_delta);
-				kunmap_atomic(vaddr);
+				memcpy_from_page(prior_data, skb_frag_page(f),
+						 skb_frag_off(f) + remaining,
+						 frag_delta);
+
 				/* get the next page */
 				f = &record->frags[i + 1];
-				vaddr = kmap_atomic(skb_frag_page(f));
-				data = vaddr + skb_frag_off(f);
-				memcpy(prior_data + frag_delta,
-				       data, (prior_data_len - frag_delta));
-				kunmap_atomic(vaddr);
+
+				memcpy_from_page(prior_data + frag_delta,
+						 skb_frag_page(f),
+						 skb_frag_off(f),
+						 prior_data_len - frag_delta);
 			}
 			/* reset tcp_seq as per the prior_data_required len */
 			tcp_seq -= prior_data_len;

drivers/net/ethernet/sfc/tx.c

@@ -207,11 +207,11 @@ static void efx_skb_copy_bits_to_pio(struct efx_nic *efx, struct sk_buff *skb,
 		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
 		u8 *vaddr;
 
-		vaddr = kmap_atomic(skb_frag_page(f));
+		vaddr = kmap_local_page(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);
+		kunmap_local(vaddr);
 	}
 
 	EFX_WARN_ON_ONCE_PARANOID(skb_shinfo(skb)->frag_list);

drivers/net/ethernet/sun/cassini.c

@@ -90,8 +90,6 @@
 #include <linux/uaccess.h>
 #include <linux/jiffies.h>
 
-#define cas_page_map(x)      kmap_atomic((x))
-#define cas_page_unmap(x)    kunmap_atomic((x))
 #define CAS_NCPUS            num_online_cpus()
 
 #define cas_skb_release(x)  netif_rx(x)
@@ -1915,7 +1913,7 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 	int off, swivel = RX_SWIVEL_OFF_VAL;
 	struct cas_page *page;
 	struct sk_buff *skb;
-	void *addr, *crcaddr;
+	void *crcaddr;
 	__sum16 csum;
 	char *p;
 
@@ -1936,7 +1934,7 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 	skb_reserve(skb, swivel);
 
 	p = skb->data;
-	addr = crcaddr = NULL;
+	crcaddr = NULL;
 	if (hlen) { /* always copy header pages */
 		i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
 		page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
@@ -1948,12 +1946,10 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 			i += cp->crc_size;
 		dma_sync_single_for_cpu(&cp->pdev->dev, page->dma_addr + off,
 					i, DMA_FROM_DEVICE);
-		addr = cas_page_map(page->buffer);
-		memcpy(p, addr + off, i);
+		memcpy(p, page_address(page->buffer) + off, i);
 		dma_sync_single_for_device(&cp->pdev->dev,
 					   page->dma_addr + off, i,
 					   DMA_FROM_DEVICE);
-		cas_page_unmap(addr);
 		RX_USED_ADD(page, 0x100);
 		p += hlen;
 		swivel = 0;
@@ -1984,12 +1980,11 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 		/* make sure we always copy a header */
 		swivel = 0;
 		if (p == (char *) skb->data) { /* not split */
-			addr = cas_page_map(page->buffer);
-			memcpy(p, addr + off, RX_COPY_MIN);
+			memcpy(p, page_address(page->buffer) + off,
+			       RX_COPY_MIN);
 			dma_sync_single_for_device(&cp->pdev->dev,
 						   page->dma_addr + off, i,
 						   DMA_FROM_DEVICE);
-			cas_page_unmap(addr);
 			off += RX_COPY_MIN;
 			swivel = RX_COPY_MIN;
 			RX_USED_ADD(page, cp->mtu_stride);
@@ -2036,10 +2031,8 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 			RX_USED_ADD(page, hlen + cp->crc_size);
 		}
 
-		if (cp->crc_size) {
-			addr = cas_page_map(page->buffer);
-			crcaddr  = addr + off + hlen;
-		}
+		if (cp->crc_size)
+			crcaddr = page_address(page->buffer) + off + hlen;
 
 	} else {
 		/* copying packet */
@@ -2061,12 +2054,10 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 			i += cp->crc_size;
 		dma_sync_single_for_cpu(&cp->pdev->dev, page->dma_addr + off,
 					i, DMA_FROM_DEVICE);
-		addr = cas_page_map(page->buffer);
-		memcpy(p, addr + off, i);
+		memcpy(p, page_address(page->buffer) + off, i);
 		dma_sync_single_for_device(&cp->pdev->dev,
 					   page->dma_addr + off, i,
 					   DMA_FROM_DEVICE);
-		cas_page_unmap(addr);
 		if (p == (char *) skb->data) /* not split */
 			RX_USED_ADD(page, cp->mtu_stride);
 		else
@@ -2081,20 +2072,17 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 						page->dma_addr,
 						dlen + cp->crc_size,
 						DMA_FROM_DEVICE);
-			addr = cas_page_map(page->buffer);
-			memcpy(p, addr, dlen + cp->crc_size);
+			memcpy(p, page_address(page->buffer), dlen + cp->crc_size);
 			dma_sync_single_for_device(&cp->pdev->dev,
 						   page->dma_addr,
 						   dlen + cp->crc_size,
 						   DMA_FROM_DEVICE);
-			cas_page_unmap(addr);
 			RX_USED_ADD(page, dlen + cp->crc_size);
 		}
 end_copy_pkt:
-		if (cp->crc_size) {
-			addr    = NULL;
+		if (cp->crc_size)
 			crcaddr = skb->data + alloclen;
-		}
+
 		skb_put(skb, alloclen);
 	}
 
@@ -2103,8 +2091,6 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
 		/* checksum includes FCS. strip it out. */
 		csum = csum_fold(csum_partial(crcaddr, cp->crc_size,
 					      csum_unfold(csum)));
-		if (addr)
-			cas_page_unmap(addr);
 	}
 	skb->protocol = eth_type_trans(skb, cp->dev);
 	if (skb->protocol == htons(ETH_P_IP)) {
@@ -2793,18 +2779,14 @@ static inline int cas_xmit_tx_ringN(struct cas *cp, int ring,
 
 		tabort = cas_calc_tabort(cp, skb_frag_off(fragp), len);
 		if (unlikely(tabort)) {
-			void *addr;
-
 			/* NOTE: len is always > tabort */
 			cas_write_txd(cp, ring, entry, mapping, len - tabort,
 				      ctrl, 0);
 			entry = TX_DESC_NEXT(ring, entry);
-
-			addr = cas_page_map(skb_frag_page(fragp));
-			memcpy(tx_tiny_buf(cp, ring, entry),
-			       addr + skb_frag_off(fragp) + len - tabort,
-			       tabort);
-			cas_page_unmap(addr);
+			memcpy_from_page(tx_tiny_buf(cp, ring, entry),
+					 skb_frag_page(fragp),
+					 skb_frag_off(fragp) + len - tabort,
+					 tabort);
 			mapping = tx_tiny_map(cp, ring, entry, tentry);
 			len     = tabort;
 		}

drivers/net/ethernet/sun/sunvnet_common.c

@@ -1085,13 +1085,13 @@ static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
 		u8 *vaddr;
 
 		if (nc < ncookies) {
-			vaddr = kmap_atomic(skb_frag_page(f));
+			vaddr = kmap_local_page(skb_frag_page(f));
 			blen = skb_frag_size(f);
 			blen += 8 - (blen & 7);
 			err = ldc_map_single(lp, vaddr + skb_frag_off(f),
 					     blen, cookies + nc, ncookies - nc,
 					     map_perm);
-			kunmap_atomic(vaddr);
+			kunmap_local(vaddr);
 		} else {
 			err = -EMSGSIZE;
 		}

drivers/net/thunderbolt.c

@@ -1051,7 +1051,7 @@ static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num,
 	const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num];
 
 	*len = skb_frag_size(frag);
-	return kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag);
+	return kmap_local_page(skb_frag_page(frag)) + skb_frag_off(frag);
 }
 
 static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
@@ -1109,7 +1109,7 @@ static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
 			dest += len;
 
 			if (unmap) {
-				kunmap_atomic(src);
+				kunmap_local(src);
 				unmap = false;
 			}
 
@@ -1147,7 +1147,7 @@ static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
 		dest += len;
 
 		if (unmap) {
-			kunmap_atomic(src);
+			kunmap_local(src);
 			unmap = false;
 		}
 
@@ -1162,7 +1162,7 @@ static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
 	memcpy(dest, src, data_len);
 
 	if (unmap)
-		kunmap_atomic(src);
+		kunmap_local(src);
 
 	if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1))
 		goto err_drop;