[net-next 0/7][pull request] Intel Wired LAN Driver Updates

[net-next 0/7][pull request] Intel Wired LAN Driver Updates

[Jeff Kirsher]

The following series contains updates to ixgbe and skbuff.
The skbuff patch helps reduce the overall size of sk_buff and the
remaining patches are against ixgbe.  They do the following:
 - refactor RSC and address that RSC was not setting GSO size
 - combine post-DMA processing of sk_buff fields into 1 function
 - drop _ADV since all descriptors are advanced
 - improvements in the use of clear and status bits on Rx

The following are changes since commit d9dd966d7fc088a6bed991c2b1e2fba4485e0a31:
  igb: fix warning about unused function
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next master

Alexander Duyck (7):
  ixgbe: Minor refactor of RSC
  ixgbe: Address fact that RSC was not setting GSO size for incoming
    frames
  ixgbe: Let the Rx buffer allocation clear status bits instead of
    cleanup
  ixgbe: Add function for testing status bits in Rx descriptor
  ixgbe: Drop the _ADV of descriptor macros since all ixgbe descriptors
    are ADV
  ixgbe: Combine post-DMA processing of sk_buff fields into single
    function
  skbuff: Move rxhash and vlan_tci to consolidate holes in sk_buff

 drivers/net/ethernet/intel/ixgbe/ixgbe.h         |   29 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c |    4 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c    |   59 ++-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c    |  686 ++++++++++++++--------
 include/linux/skbuff.h                           |    9 +-
 5 files changed, 505 insertions(+), 282 deletions(-)

-- 
1.7.7.6

[net-next 1/7] ixgbe: Minor refactor of RSC

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change addresses several issue.

First I had left the use of the next and prev skb pointers floating around
in the code and they were overdue to be pulled since I had rewritten the
RSC code in the out-of-tree driver some time ago to address issues brought
up by David Miller in regards to this.

I am also now defaulting to always leaving the first buffer unmapped on any
packet and then unmapping it after we read the EOP descriptor.  This allows
a simplification of the path with less branching.

Instead of counting packets received the code was changed some time ago to
track the number of buffers received.  This leads to inaccurate counting
when you compare numbers of packets received by the hardware versus what is
tracked by the software.  To correct this I am revising things so that the
append_cnt value for RSC accurately tracks the number of frames received.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      |   10 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  235 +++++++++++++++----------
 2 files changed, 147 insertions(+), 98 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index e6aeb64..fca0553 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -535,12 +535,16 @@ enum ixbge_state_t {
 	__IXGBE_IN_SFP_INIT,
 };
 
-struct ixgbe_rsc_cb {
+struct ixgbe_cb {
+	union {				/* Union defining head/tail partner */
+		struct sk_buff *head;
+		struct sk_buff *tail;
+	};
 	dma_addr_t dma;
-	u16 skb_cnt;
+	u16 append_cnt;
 	bool delay_unmap;
 };
-#define IXGBE_RSC_CB(skb) ((struct ixgbe_rsc_cb *)(skb)->cb)
+#define IXGBE_CB(skb) ((struct ixgbe_cb *)(skb)->cb)
 
 enum ixgbe_boards {
 	board_82598,
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index ecc46ce..18e474c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1207,40 +1207,96 @@ static inline u16 ixgbe_get_hlen(union ixgbe_adv_rx_desc *rx_desc)
 }
 
 /**
- * ixgbe_transform_rsc_queue - change rsc queue into a full packet
- * @skb: pointer to the last skb in the rsc queue
+ * ixgbe_merge_active_tail - merge active tail into lro skb
+ * @tail: pointer to active tail in frag_list
  *
- * This function changes a queue full of hw rsc buffers into a completed
- * packet.  It uses the ->prev pointers to find the first packet and then
- * turns it into the frag list owner.
+ * This function merges the length and data of an active tail into the
+ * skb containing the frag_list.  It resets the tail's pointer to the head,
+ * but it leaves the heads pointer to tail intact.
  **/
-static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb)
+static inline struct sk_buff *ixgbe_merge_active_tail(struct sk_buff *tail)
 {
-	unsigned int frag_list_size = 0;
-	unsigned int skb_cnt = 1;
+	struct sk_buff *head = IXGBE_CB(tail)->head;
 
-	while (skb->prev) {
-		struct sk_buff *prev = skb->prev;
-		frag_list_size += skb->len;
-		skb->prev = NULL;
-		skb = prev;
-		skb_cnt++;
+	if (!head)
+		return tail;
+
+	head->len += tail->len;
+	head->data_len += tail->len;
+	head->truesize += tail->len;
+
+	IXGBE_CB(tail)->head = NULL;
+
+	return head;
+}
+
+/**
+ * ixgbe_add_active_tail - adds an active tail into the skb frag_list
+ * @head: pointer to the start of the skb
+ * @tail: pointer to active tail to add to frag_list
+ *
+ * This function adds an active tail to the end of the frag list.  This tail
+ * will still be receiving data so we cannot yet ad it's stats to the main
+ * skb.  That is done via ixgbe_merge_active_tail.
+ **/
+static inline void ixgbe_add_active_tail(struct sk_buff *head,
+					 struct sk_buff *tail)
+{
+	struct sk_buff *old_tail = IXGBE_CB(head)->tail;
+
+	if (old_tail) {
+		ixgbe_merge_active_tail(old_tail);
+		old_tail->next = tail;
+	} else {
+		skb_shinfo(head)->frag_list = tail;
 	}
 
-	skb_shinfo(skb)->frag_list = skb->next;
-	skb->next = NULL;
-	skb->len += frag_list_size;
-	skb->data_len += frag_list_size;
-	skb->truesize += frag_list_size;
-	IXGBE_RSC_CB(skb)->skb_cnt = skb_cnt;
+	IXGBE_CB(tail)->head = head;
+	IXGBE_CB(head)->tail = tail;
+}
+
+/**
+ * ixgbe_close_active_frag_list - cleanup pointers on a frag_list skb
+ * @head: pointer to head of an active frag list
+ *
+ * This function will clear the frag_tail_tracker pointer on an active
+ * frag_list and returns true if the pointer was actually set
+ **/
+static inline bool ixgbe_close_active_frag_list(struct sk_buff *head)
+{
+	struct sk_buff *tail = IXGBE_CB(head)->tail;
+
+	if (!tail)
+		return false;
 
-	return skb;
+	ixgbe_merge_active_tail(tail);
+
+	IXGBE_CB(head)->tail = NULL;
+
+	return true;
 }
 
-static inline bool ixgbe_get_rsc_state(union ixgbe_adv_rx_desc *rx_desc)
+static void ixgbe_get_rsc_cnt(struct ixgbe_ring *rx_ring,
+			      union ixgbe_adv_rx_desc *rx_desc,
+			      struct sk_buff *skb)
 {
-	return !!(le32_to_cpu(rx_desc->wb.lower.lo_dword.data) &
-		IXGBE_RXDADV_RSCCNT_MASK);
+	__le32 rsc_enabled;
+	u32 rsc_cnt;
+
+	if (!ring_is_rsc_enabled(rx_ring))
+		return;
+
+	rsc_enabled = rx_desc->wb.lower.lo_dword.data &
+		      cpu_to_le32(IXGBE_RXDADV_RSCCNT_MASK);
+
+	/* If this is an RSC frame rsc_cnt should be non-zero */
+	if (!rsc_enabled)
+		return;
+
+	rsc_cnt = le32_to_cpu(rsc_enabled);
+	rsc_cnt >>= IXGBE_RXDADV_RSCCNT_SHIFT;
+
+	IXGBE_CB(skb)->append_cnt += rsc_cnt - 1;
 }
 
 static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
@@ -1249,7 +1305,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 {
 	struct ixgbe_adapter *adapter = q_vector->adapter;
 	union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
-	struct ixgbe_rx_buffer *rx_buffer_info, *next_buffer;
+	struct ixgbe_rx_buffer *rx_buffer_info;
 	struct sk_buff *skb;
 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 	const int current_node = numa_node_id();
@@ -1259,7 +1315,6 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 	u32 staterr;
 	u16 i;
 	u16 cleaned_count = 0;
-	bool pkt_is_rsc = false;
 
 	i = rx_ring->next_to_clean;
 	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
@@ -1276,32 +1331,9 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		rx_buffer_info->skb = NULL;
 		prefetch(skb->data);
 
-		if (ring_is_rsc_enabled(rx_ring))
-			pkt_is_rsc = ixgbe_get_rsc_state(rx_desc);
-
 		/* linear means we are building an skb from multiple pages */
 		if (!skb_is_nonlinear(skb)) {
 			u16 hlen;
-			if (pkt_is_rsc &&
-			    !(staterr & IXGBE_RXD_STAT_EOP) &&
-			    !skb->prev) {
-				/*
-				 * When HWRSC is enabled, delay unmapping
-				 * of the first packet. It carries the
-				 * header information, HW may still
-				 * access the header after the writeback.
-				 * Only unmap it when EOP is reached
-				 */
-				IXGBE_RSC_CB(skb)->delay_unmap = true;
-				IXGBE_RSC_CB(skb)->dma = rx_buffer_info->dma;
-			} else {
-				dma_unmap_single(rx_ring->dev,
-						 rx_buffer_info->dma,
-						 rx_ring->rx_buf_len,
-						 DMA_FROM_DEVICE);
-			}
-			rx_buffer_info->dma = 0;
-
 			if (ring_is_ps_enabled(rx_ring)) {
 				hlen = ixgbe_get_hlen(rx_desc);
 				upper_len = le16_to_cpu(rx_desc->wb.upper.length);
@@ -1310,6 +1342,23 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			}
 
 			skb_put(skb, hlen);
+
+			/*
+			 * Delay unmapping of the first packet. It carries the
+			 * header information, HW may still access the header
+			 * after writeback.  Only unmap it when EOP is reached
+			 */
+			if (!IXGBE_CB(skb)->head) {
+				IXGBE_CB(skb)->delay_unmap = true;
+				IXGBE_CB(skb)->dma = rx_buffer_info->dma;
+			} else {
+				skb = ixgbe_merge_active_tail(skb);
+				dma_unmap_single(rx_ring->dev,
+						 rx_buffer_info->dma,
+						 rx_ring->rx_buf_len,
+						 DMA_FROM_DEVICE);
+			}
+			rx_buffer_info->dma = 0;
 		} else {
 			/* assume packet split since header is unmapped */
 			upper_len = le16_to_cpu(rx_desc->wb.upper.length);
@@ -1337,6 +1386,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			skb->truesize += PAGE_SIZE / 2;
 		}
 
+		ixgbe_get_rsc_cnt(rx_ring, rx_desc, skb);
+
 		i++;
 		if (i == rx_ring->count)
 			i = 0;
@@ -1345,55 +1396,50 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		prefetch(next_rxd);
 		cleaned_count++;
 
-		if (pkt_is_rsc) {
-			u32 nextp = (staterr & IXGBE_RXDADV_NEXTP_MASK) >>
-				     IXGBE_RXDADV_NEXTP_SHIFT;
+		if (!(staterr & IXGBE_RXD_STAT_EOP)) {
+			struct ixgbe_rx_buffer *next_buffer;
+			u32 nextp;
+
+			if (IXGBE_CB(skb)->append_cnt) {
+				nextp = staterr & IXGBE_RXDADV_NEXTP_MASK;
+				nextp >>= IXGBE_RXDADV_NEXTP_SHIFT;
+			} else {
+				nextp = i;
+			}
+
 			next_buffer = &rx_ring->rx_buffer_info[nextp];
-		} else {
-			next_buffer = &rx_ring->rx_buffer_info[i];
-		}
 
-		if (!(staterr & IXGBE_RXD_STAT_EOP)) {
 			if (ring_is_ps_enabled(rx_ring)) {
 				rx_buffer_info->skb = next_buffer->skb;
 				rx_buffer_info->dma = next_buffer->dma;
 				next_buffer->skb = skb;
 				next_buffer->dma = 0;
 			} else {
-				skb->next = next_buffer->skb;
-				skb->next->prev = skb;
+				struct sk_buff *next_skb = next_buffer->skb;
+				ixgbe_add_active_tail(skb, next_skb);
+				IXGBE_CB(next_skb)->head = skb;
 			}
 			rx_ring->rx_stats.non_eop_descs++;
 			goto next_desc;
 		}
 
-		if (skb->prev) {
-			skb = ixgbe_transform_rsc_queue(skb);
+		dma_unmap_single(rx_ring->dev,
+				 IXGBE_CB(skb)->dma,
+				 rx_ring->rx_buf_len,
+				 DMA_FROM_DEVICE);
+		IXGBE_CB(skb)->dma = 0;
+		IXGBE_CB(skb)->delay_unmap = false;
+
+		if (ixgbe_close_active_frag_list(skb) &&
+		    !IXGBE_CB(skb)->append_cnt) {
 			/* if we got here without RSC the packet is invalid */
-			if (!pkt_is_rsc) {
-				__pskb_trim(skb, 0);
-				rx_buffer_info->skb = skb;
-				goto next_desc;
-			}
+			dev_kfree_skb_any(skb);
+			goto next_desc;
 		}
 
-		if (ring_is_rsc_enabled(rx_ring)) {
-			if (IXGBE_RSC_CB(skb)->delay_unmap) {
-				dma_unmap_single(rx_ring->dev,
-						 IXGBE_RSC_CB(skb)->dma,
-						 rx_ring->rx_buf_len,
-						 DMA_FROM_DEVICE);
-				IXGBE_RSC_CB(skb)->dma = 0;
-				IXGBE_RSC_CB(skb)->delay_unmap = false;
-			}
-		}
-		if (pkt_is_rsc) {
-			if (ring_is_ps_enabled(rx_ring))
-				rx_ring->rx_stats.rsc_count +=
-					skb_shinfo(skb)->nr_frags;
-			else
-				rx_ring->rx_stats.rsc_count +=
-					IXGBE_RSC_CB(skb)->skb_cnt;
+		if (IXGBE_CB(skb)->append_cnt) {
+			rx_ring->rx_stats.rsc_count +=
+					IXGBE_CB(skb)->append_cnt;
 			rx_ring->rx_stats.rsc_flush++;
 		}
 
@@ -3881,19 +3927,18 @@ static void ixgbe_clean_rx_ring(struct ixgbe_ring *rx_ring)
 		if (rx_buffer_info->skb) {
 			struct sk_buff *skb = rx_buffer_info->skb;
 			rx_buffer_info->skb = NULL;
-			do {
-				struct sk_buff *this = skb;
-				if (IXGBE_RSC_CB(this)->delay_unmap) {
-					dma_unmap_single(dev,
-							 IXGBE_RSC_CB(this)->dma,
-							 rx_ring->rx_buf_len,
-							 DMA_FROM_DEVICE);
-					IXGBE_RSC_CB(this)->dma = 0;
-					IXGBE_RSC_CB(skb)->delay_unmap = false;
-				}
-				skb = skb->prev;
-				dev_kfree_skb(this);
-			} while (skb);
+			/* We need to clean up RSC frag lists */
+			skb = ixgbe_merge_active_tail(skb);
+			ixgbe_close_active_frag_list(skb);
+			if (IXGBE_CB(skb)->delay_unmap) {
+				dma_unmap_single(dev,
+						 IXGBE_CB(skb)->dma,
+						 rx_ring->rx_buf_len,
+						 DMA_FROM_DEVICE);
+				IXGBE_CB(skb)->dma = 0;
+				IXGBE_CB(skb)->delay_unmap = false;
+			}
+			dev_kfree_skb(skb);
 		}
 		if (!rx_buffer_info->page)
 			continue;
-- 
1.7.7.6

[net-next 2/7] ixgbe: Address fact that RSC was not setting GSO size for incoming frames

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This patch is meant to address the fact that RSC has not been setting the
gso_size value on the skb.  As a result performance on lossy TCP
connections was negatively impacted.  This change resolves the issue by
setting gso_size to the average size for incoming packets.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  130 ++++++++++++++++++++++++-
 1 files changed, 125 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 18e474c..762f3377 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1276,6 +1276,104 @@ static inline bool ixgbe_close_active_frag_list(struct sk_buff *head)
 	return true;
 }
 
+/**
+ * ixgbe_get_headlen - determine size of header for RSC/LRO/GRO/FCOE
+ * @data: pointer to the start of the headers
+ * @max_len: total length of section to find headers in
+ *
+ * This function is meant to determine the length of headers that will
+ * be recognized by hardware for LRO, GRO, and RSC offloads.  The main
+ * motivation of doing this is to only perform one pull for IPv4 TCP
+ * packets so that we can do basic things like calculating the gso_size
+ * based on the average data per packet.
+ **/
+static unsigned int ixgbe_get_headlen(unsigned char *data,
+				      unsigned int max_len)
+{
+	union {
+		unsigned char *network;
+		/* l2 headers */
+		struct ethhdr *eth;
+		struct vlan_hdr *vlan;
+		/* l3 headers */
+		struct iphdr *ipv4;
+	} hdr;
+	__be16 protocol;
+	u8 nexthdr = 0;	/* default to not TCP */
+	u8 hlen;
+
+	/* this should never happen, but better safe than sorry */
+	if (max_len < ETH_HLEN)
+		return max_len;
+
+	/* initialize network frame pointer */
+	hdr.network = data;
+
+	/* set first protocol and move network header forward */
+	protocol = hdr.eth->h_proto;
+	hdr.network += ETH_HLEN;
+
+	/* handle any vlan tag if present */
+	if (protocol == __constant_htons(ETH_P_8021Q)) {
+		if ((hdr.network - data) > (max_len - VLAN_HLEN))
+			return max_len;
+
+		protocol = hdr.vlan->h_vlan_encapsulated_proto;
+		hdr.network += VLAN_HLEN;
+	}
+
+	/* handle L3 protocols */
+	if (protocol == __constant_htons(ETH_P_IP)) {
+		if ((hdr.network - data) > (max_len - sizeof(struct iphdr)))
+			return max_len;
+
+		/* access ihl as a u8 to avoid unaligned access on ia64 */
+		hlen = (hdr.network[0] & 0x0F) << 2;
+
+		/* verify hlen meets minimum size requirements */
+		if (hlen < sizeof(struct iphdr))
+			return hdr.network - data;
+
+		/* record next protocol */
+		nexthdr = hdr.ipv4->protocol;
+		hdr.network += hlen;
+#ifdef CONFIG_FCOE
+	} else if (protocol == __constant_htons(ETH_P_FCOE)) {
+		if ((hdr.network - data) > (max_len - FCOE_HEADER_LEN))
+			return max_len;
+		hdr.network += FCOE_HEADER_LEN;
+#endif
+	} else {
+		return hdr.network - data;
+	}
+
+	/* finally sort out TCP */
+	if (nexthdr == IPPROTO_TCP) {
+		if ((hdr.network - data) > (max_len - sizeof(struct tcphdr)))
+			return max_len;
+
+		/* access doff as a u8 to avoid unaligned access on ia64 */
+		hlen = (hdr.network[12] & 0xF0) >> 2;
+
+		/* verify hlen meets minimum size requirements */
+		if (hlen < sizeof(struct tcphdr))
+			return hdr.network - data;
+
+		hdr.network += hlen;
+	}
+
+	/*
+	 * If everything has gone correctly hdr.network should be the
+	 * data section of the packet and will be the end of the header.
+	 * If not then it probably represents the end of the last recognized
+	 * header.
+	 */
+	if ((hdr.network - data) < max_len)
+		return hdr.network - data;
+	else
+		return max_len;
+}
+
 static void ixgbe_get_rsc_cnt(struct ixgbe_ring *rx_ring,
 			      union ixgbe_adv_rx_desc *rx_desc,
 			      struct sk_buff *skb)
@@ -1299,6 +1397,32 @@ static void ixgbe_get_rsc_cnt(struct ixgbe_ring *rx_ring,
 	IXGBE_CB(skb)->append_cnt += rsc_cnt - 1;
 }
 
+static void ixgbe_set_rsc_gso_size(struct ixgbe_ring *ring,
+				   struct sk_buff *skb)
+{
+	u16 hdr_len = ixgbe_get_headlen(skb->data, skb_headlen(skb));
+
+	/* set gso_size to avoid messing up TCP MSS */
+	skb_shinfo(skb)->gso_size = DIV_ROUND_UP((skb->len - hdr_len),
+						 IXGBE_CB(skb)->append_cnt);
+}
+
+static void ixgbe_update_rsc_stats(struct ixgbe_ring *rx_ring,
+				   struct sk_buff *skb)
+{
+	/* if append_cnt is 0 then frame is not RSC */
+	if (!IXGBE_CB(skb)->append_cnt)
+		return;
+
+	rx_ring->rx_stats.rsc_count += IXGBE_CB(skb)->append_cnt;
+	rx_ring->rx_stats.rsc_flush++;
+
+	ixgbe_set_rsc_gso_size(rx_ring, skb);
+
+	/* gso_size is computed using append_cnt so always clear it last */
+	IXGBE_CB(skb)->append_cnt = 0;
+}
+
 static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			       struct ixgbe_ring *rx_ring,
 			       int budget)
@@ -1437,11 +1561,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			goto next_desc;
 		}
 
-		if (IXGBE_CB(skb)->append_cnt) {
-			rx_ring->rx_stats.rsc_count +=
-					IXGBE_CB(skb)->append_cnt;
-			rx_ring->rx_stats.rsc_flush++;
-		}
+		ixgbe_update_rsc_stats(rx_ring, skb);
 
 		/* ERR_MASK will only have valid bits if EOP set */
 		if (unlikely(staterr & IXGBE_RXDADV_ERR_FRAME_ERR_MASK)) {
-- 
1.7.7.6

[net-next 3/7] ixgbe: Let the Rx buffer allocation clear status bits instead of cleanup

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change makes it so that we always clear the status/error bits in the
Rx descriptor in the allocation path instead of the cleanup path.  The
advantage to this is that we spend less time modifying data.  As such we
can modify the data once and then let it go cold in the cache instead of
writing it, reading it, and then writing it again.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  155 +++++++++++++++----------
 1 files changed, 93 insertions(+), 62 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 762f3377..538577b 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1101,8 +1101,75 @@ static inline void ixgbe_release_rx_desc(struct ixgbe_ring *rx_ring, u32 val)
 	writel(val, rx_ring->tail);
 }
 
+static bool ixgbe_alloc_mapped_skb(struct ixgbe_ring *rx_ring,
+				   struct ixgbe_rx_buffer *bi)
+{
+	struct sk_buff *skb = bi->skb;
+	dma_addr_t dma = bi->dma;
+
+	if (dma)
+		return true;
+
+	if (likely(!skb)) {
+		skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
+						rx_ring->rx_buf_len);
+		bi->skb = skb;
+		if (!skb) {
+			rx_ring->rx_stats.alloc_rx_buff_failed++;
+			return false;
+		}
+
+		/* initialize skb for ring */
+		skb_record_rx_queue(skb, rx_ring->queue_index);
+	}
+
+	dma = dma_map_single(rx_ring->dev, skb->data,
+			     rx_ring->rx_buf_len, DMA_FROM_DEVICE);
+
+	if (dma_mapping_error(rx_ring->dev, dma)) {
+		rx_ring->rx_stats.alloc_rx_buff_failed++;
+		return false;
+	}
+
+	bi->dma = dma;
+	return true;
+}
+
+static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
+				    struct ixgbe_rx_buffer *bi)
+{
+	struct page *page = bi->page;
+	dma_addr_t page_dma = bi->page_dma;
+	unsigned int page_offset = bi->page_offset ^ (PAGE_SIZE / 2);
+
+	if (page_dma)
+		return true;
+
+	if (!page) {
+		page = alloc_page(GFP_ATOMIC | __GFP_COLD);
+		bi->page = page;
+		if (unlikely(!page)) {
+			rx_ring->rx_stats.alloc_rx_page_failed++;
+			return false;
+		}
+	}
+
+	page_dma = dma_map_page(rx_ring->dev, page,
+				page_offset, PAGE_SIZE / 2,
+				DMA_FROM_DEVICE);
+
+	if (dma_mapping_error(rx_ring->dev, page_dma)) {
+		rx_ring->rx_stats.alloc_rx_page_failed++;
+		return false;
+	}
+
+	bi->page_dma = page_dma;
+	bi->page_offset = page_offset;
+	return true;
+}
+
 /**
- * ixgbe_alloc_rx_buffers - Replace used receive buffers; packet split
+ * ixgbe_alloc_rx_buffers - Replace used receive buffers
  * @rx_ring: ring to place buffers on
  * @cleaned_count: number of buffers to replace
  **/
@@ -1110,82 +1177,48 @@ void ixgbe_alloc_rx_buffers(struct ixgbe_ring *rx_ring, u16 cleaned_count)
 {
 	union ixgbe_adv_rx_desc *rx_desc;
 	struct ixgbe_rx_buffer *bi;
-	struct sk_buff *skb;
 	u16 i = rx_ring->next_to_use;
 
-	/* do nothing if no valid netdev defined */
-	if (!rx_ring->netdev)
+	/* nothing to do or no valid netdev defined */
+	if (!cleaned_count || !rx_ring->netdev)
 		return;
 
-	while (cleaned_count--) {
-		rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
-		bi = &rx_ring->rx_buffer_info[i];
-		skb = bi->skb;
-
-		if (!skb) {
-			skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
-							rx_ring->rx_buf_len);
-			if (!skb) {
-				rx_ring->rx_stats.alloc_rx_buff_failed++;
-				goto no_buffers;
-			}
-			/* initialize queue mapping */
-			skb_record_rx_queue(skb, rx_ring->queue_index);
-			bi->skb = skb;
-		}
+	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
+	bi = &rx_ring->rx_buffer_info[i];
+	i -= rx_ring->count;
 
-		if (!bi->dma) {
-			bi->dma = dma_map_single(rx_ring->dev,
-						 skb->data,
-						 rx_ring->rx_buf_len,
-						 DMA_FROM_DEVICE);
-			if (dma_mapping_error(rx_ring->dev, bi->dma)) {
-				rx_ring->rx_stats.alloc_rx_buff_failed++;
-				bi->dma = 0;
-				goto no_buffers;
-			}
-		}
+	while (cleaned_count--) {
+		if (!ixgbe_alloc_mapped_skb(rx_ring, bi))
+			break;
 
+		/* Refresh the desc even if buffer_addrs didn't change
+		 * because each write-back erases this info. */
 		if (ring_is_ps_enabled(rx_ring)) {
-			if (!bi->page) {
-				bi->page = alloc_page(GFP_ATOMIC | __GFP_COLD);
-				if (!bi->page) {
-					rx_ring->rx_stats.alloc_rx_page_failed++;
-					goto no_buffers;
-				}
-			}
+			rx_desc->read.hdr_addr = cpu_to_le64(bi->dma);
 
-			if (!bi->page_dma) {
-				/* use a half page if we're re-using */
-				bi->page_offset ^= PAGE_SIZE / 2;
-				bi->page_dma = dma_map_page(rx_ring->dev,
-							    bi->page,
-							    bi->page_offset,
-							    PAGE_SIZE / 2,
-							    DMA_FROM_DEVICE);
-				if (dma_mapping_error(rx_ring->dev,
-						      bi->page_dma)) {
-					rx_ring->rx_stats.alloc_rx_page_failed++;
-					bi->page_dma = 0;
-					goto no_buffers;
-				}
-			}
+			if (!ixgbe_alloc_mapped_page(rx_ring, bi))
+				break;
 
-			/* Refresh the desc even if buffer_addrs didn't change
-			 * because each write-back erases this info. */
 			rx_desc->read.pkt_addr = cpu_to_le64(bi->page_dma);
-			rx_desc->read.hdr_addr = cpu_to_le64(bi->dma);
 		} else {
 			rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
-			rx_desc->read.hdr_addr = 0;
 		}
 
+		rx_desc++;
+		bi++;
 		i++;
-		if (i == rx_ring->count)
-			i = 0;
+		if (unlikely(!i)) {
+			rx_desc = IXGBE_RX_DESC_ADV(rx_ring, 0);
+			bi = rx_ring->rx_buffer_info;
+			i -= rx_ring->count;
+		}
+
+		/* clear the hdr_addr for the next_to_use descriptor */
+		rx_desc->read.hdr_addr = 0;
 	}
 
-no_buffers:
+	i += rx_ring->count;
+
 	if (rx_ring->next_to_use != i) {
 		rx_ring->next_to_use = i;
 		ixgbe_release_rx_desc(rx_ring, i);
@@ -1593,8 +1626,6 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 
 		budget--;
 next_desc:
-		rx_desc->wb.upper.status_error = 0;
-
 		if (!budget)
 			break;
 
-- 
1.7.7.6

[net-next 4/7] ixgbe: Add function for testing status bits in Rx descriptor

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change adds a small function for testing Rx status bits in the
descriptor.  The advantage to this is that we can avoid unnecessary
byte swaps on big endian systems.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      |   10 +++-
 drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c |   59 +++++++++++++++----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |   51 +++++++++------------
 3 files changed, 65 insertions(+), 55 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index fca0553..260e176 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -329,6 +329,13 @@ struct ixgbe_q_vector {
 #define IXGBE_10K_ITR		400
 #define IXGBE_8K_ITR		500
 
+/* ixgbe_test_staterr - tests bits in Rx descriptor status and error fields */
+static inline __le32 ixgbe_test_staterr(union ixgbe_adv_rx_desc *rx_desc,
+					const u32 stat_err_bits)
+{
+	return rx_desc->wb.upper.status_error & cpu_to_le32(stat_err_bits);
+}
+
 static inline u16 ixgbe_desc_unused(struct ixgbe_ring *ring)
 {
 	u16 ntc = ring->next_to_clean;
@@ -618,8 +625,7 @@ extern int ixgbe_fso(struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 extern void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter);
 extern int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 			  union ixgbe_adv_rx_desc *rx_desc,
-			  struct sk_buff *skb,
-			  u32 staterr);
+			  struct sk_buff *skb);
 extern int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
                               struct scatterlist *sgl, unsigned int sgc);
 extern int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
index 4bc7942..da7da75 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
@@ -357,22 +357,20 @@ int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
  */
 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 		   union ixgbe_adv_rx_desc *rx_desc,
-		   struct sk_buff *skb,
-		   u32 staterr)
+		   struct sk_buff *skb)
 {
-	u16 xid;
-	u32 fctl;
-	u32 fceofe, fcerr, fcstat;
 	int rc = -EINVAL;
 	struct ixgbe_fcoe *fcoe;
 	struct ixgbe_fcoe_ddp *ddp;
 	struct fc_frame_header *fh;
 	struct fcoe_crc_eof *crc;
+	__le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
+	__le32 ddp_err;
+	u32 fctl;
+	u16 xid;
 
-	fcerr = (staterr & IXGBE_RXDADV_ERR_FCERR);
-	fceofe = (staterr & IXGBE_RXDADV_ERR_FCEOFE);
-	if (fcerr == IXGBE_FCERR_BADCRC)
-		skb_checksum_none_assert(skb);
+	if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
+		skb->ip_summed = CHECKSUM_NONE;
 	else
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
@@ -382,6 +380,7 @@ int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 	else
 		fh = (struct fc_frame_header *)(skb->data +
 			sizeof(struct fcoe_hdr));
+
 	fctl = ntoh24(fh->fh_f_ctl);
 	if (fctl & FC_FC_EX_CTX)
 		xid =  be16_to_cpu(fh->fh_ox_id);
@@ -396,27 +395,39 @@ int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 	if (!ddp->udl)
 		goto ddp_out;
 
-	if (fcerr | fceofe)
+	ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
+					      IXGBE_RXDADV_ERR_FCERR);
+	if (ddp_err)
 		goto ddp_out;
 
-	fcstat = (staterr & IXGBE_RXDADV_STAT_FCSTAT);
-	if (fcstat) {
+	switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
+	/* return 0 to bypass going to ULD for DDPed data */
+	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
 		/* update length of DDPed data */
 		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
-		/* unmap the sg list when FCP_RSP is received */
-		if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
-			pci_unmap_sg(adapter->pdev, ddp->sgl,
-				     ddp->sgc, DMA_FROM_DEVICE);
-			ddp->err = (fcerr | fceofe);
-			ddp->sgl = NULL;
-			ddp->sgc = 0;
-		}
-		/* return 0 to bypass going to ULD for DDPed data */
-		if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
-			rc = 0;
-		else if (ddp->len)
+		rc = 0;
+		break;
+	/* unmap the sg list when FCPRSP is received */
+	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
+		pci_unmap_sg(adapter->pdev, ddp->sgl,
+			     ddp->sgc, DMA_FROM_DEVICE);
+		ddp->err = ddp_err;
+		ddp->sgl = NULL;
+		ddp->sgc = 0;
+		/* fall through */
+	/* if DDP length is present pass it through to ULD */
+	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
+		/* update length of DDPed data */
+		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
+		if (ddp->len)
 			rc = ddp->len;
+		break;
+	/* no match will return as an error */
+	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
+	default:
+		break;
 	}
+
 	/* In target mode, check the last data frame of the sequence.
 	 * For DDP in target mode, data is already DDPed but the header
 	 * indication of the last data frame ould allow is to tell if we
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 538577b..b0469dd 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1019,25 +1019,23 @@ static inline bool ixgbe_rx_is_fcoe(struct ixgbe_adapter *adapter,
  * ixgbe_receive_skb - Send a completed packet up the stack
  * @adapter: board private structure
  * @skb: packet to send up
- * @status: hardware indication of status of receive
  * @rx_ring: rx descriptor ring (for a specific queue) to setup
  * @rx_desc: rx descriptor
  **/
 static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
-			      struct sk_buff *skb, u8 status,
+			      struct sk_buff *skb,
 			      struct ixgbe_ring *ring,
 			      union ixgbe_adv_rx_desc *rx_desc)
 {
 	struct ixgbe_adapter *adapter = q_vector->adapter;
-	struct napi_struct *napi = &q_vector->napi;
-	bool is_vlan = (status & IXGBE_RXD_STAT_VP);
-	u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);
 
-	if (is_vlan && (tag & VLAN_VID_MASK))
-		__vlan_hwaccel_put_tag(skb, tag);
+	if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_VP)) {
+		u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
+		__vlan_hwaccel_put_tag(skb, vid);
+	}
 
 	if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
-		napi_gro_receive(napi, skb);
+		napi_gro_receive(&q_vector->napi, skb);
 	else
 		netif_rx(skb);
 }
@@ -1047,12 +1045,10 @@ static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
  * @adapter: address of board private structure
  * @status_err: hardware indication of status of receive
  * @skb: skb currently being received and modified
- * @status_err: status error value of last descriptor in packet
  **/
 static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
 				     union ixgbe_adv_rx_desc *rx_desc,
-				     struct sk_buff *skb,
-				     u32 status_err)
+				     struct sk_buff *skb)
 {
 	skb->ip_summed = CHECKSUM_NONE;
 
@@ -1061,16 +1057,16 @@ static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
 		return;
 
 	/* if IP and error */
-	if ((status_err & IXGBE_RXD_STAT_IPCS) &&
-	    (status_err & IXGBE_RXDADV_ERR_IPE)) {
+	if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_IPCS) &&
+	    ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_IPE)) {
 		adapter->hw_csum_rx_error++;
 		return;
 	}
 
-	if (!(status_err & IXGBE_RXD_STAT_L4CS))
+	if (!ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_L4CS))
 		return;
 
-	if (status_err & IXGBE_RXDADV_ERR_TCPE) {
+	if (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_TCPE)) {
 		u16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
 
 		/*
@@ -1091,6 +1087,7 @@ static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
 
 static inline void ixgbe_release_rx_desc(struct ixgbe_ring *rx_ring, u32 val)
 {
+	rx_ring->next_to_use = val;
 	/*
 	 * Force memory writes to complete before letting h/w
 	 * know there are new descriptors to fetch.  (Only
@@ -1219,10 +1216,8 @@ void ixgbe_alloc_rx_buffers(struct ixgbe_ring *rx_ring, u16 cleaned_count)
 
 	i += rx_ring->count;
 
-	if (rx_ring->next_to_use != i) {
-		rx_ring->next_to_use = i;
+	if (rx_ring->next_to_use != i)
 		ixgbe_release_rx_desc(rx_ring, i);
-	}
 }
 
 static inline u16 ixgbe_get_hlen(union ixgbe_adv_rx_desc *rx_desc)
@@ -1469,15 +1464,13 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 #ifdef IXGBE_FCOE
 	int ddp_bytes = 0;
 #endif /* IXGBE_FCOE */
-	u32 staterr;
 	u16 i;
 	u16 cleaned_count = 0;
 
 	i = rx_ring->next_to_clean;
 	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
-	staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 
-	while (staterr & IXGBE_RXD_STAT_DD) {
+	while (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_DD)) {
 		u32 upper_len = 0;
 
 		rmb(); /* read descriptor and rx_buffer_info after status DD */
@@ -1553,12 +1546,13 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		prefetch(next_rxd);
 		cleaned_count++;
 
-		if (!(staterr & IXGBE_RXD_STAT_EOP)) {
+		if ((!ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_EOP))) {
 			struct ixgbe_rx_buffer *next_buffer;
 			u32 nextp;
 
 			if (IXGBE_CB(skb)->append_cnt) {
-				nextp = staterr & IXGBE_RXDADV_NEXTP_MASK;
+				nextp = le32_to_cpu(
+						rx_desc->wb.upper.status_error);
 				nextp >>= IXGBE_RXDADV_NEXTP_SHIFT;
 			} else {
 				nextp = i;
@@ -1597,12 +1591,13 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		ixgbe_update_rsc_stats(rx_ring, skb);
 
 		/* ERR_MASK will only have valid bits if EOP set */
-		if (unlikely(staterr & IXGBE_RXDADV_ERR_FRAME_ERR_MASK)) {
+		if (unlikely(ixgbe_test_staterr(rx_desc,
+					    IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
 			dev_kfree_skb_any(skb);
 			goto next_desc;
 		}
 
-		ixgbe_rx_checksum(adapter, rx_desc, skb, staterr);
+		ixgbe_rx_checksum(adapter, rx_desc, skb);
 		if (adapter->netdev->features & NETIF_F_RXHASH)
 			ixgbe_rx_hash(rx_desc, skb);
 
@@ -1614,15 +1609,14 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 #ifdef IXGBE_FCOE
 		/* if ddp, not passing to ULD unless for FCP_RSP or error */
 		if (ixgbe_rx_is_fcoe(adapter, rx_desc)) {
-			ddp_bytes = ixgbe_fcoe_ddp(adapter, rx_desc, skb,
-						   staterr);
+			ddp_bytes = ixgbe_fcoe_ddp(adapter, rx_desc, skb);
 			if (!ddp_bytes) {
 				dev_kfree_skb_any(skb);
 				goto next_desc;
 			}
 		}
 #endif /* IXGBE_FCOE */
-		ixgbe_receive_skb(q_vector, skb, staterr, rx_ring, rx_desc);
+		ixgbe_receive_skb(q_vector, skb, rx_ring, rx_desc);
 
 		budget--;
 next_desc:
@@ -1637,7 +1631,6 @@ next_desc:
 
 		/* use prefetched values */
 		rx_desc = next_rxd;
-		staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 	}
 
 	rx_ring->next_to_clean = i;
-- 
1.7.7.6

[net-next 5/7] ixgbe: Drop the _ADV of descriptor macros since all ixgbe descriptors are ADV

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

It doesn't make much sense to differentiate between advanced and legacy
descriptors when the only descriptors that ixgbe uses are advanced
descriptors.  As such we can drop the _ADV suffix since all ixgbe
descriptors are automatically advanced.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h         |    6 ++--
 drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c |    4 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c    |   26 +++++++++++-----------
 3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 260e176..882a580 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -344,11 +344,11 @@ static inline u16 ixgbe_desc_unused(struct ixgbe_ring *ring)
 	return ((ntc > ntu) ? 0 : ring->count) + ntc - ntu - 1;
 }
 
-#define IXGBE_RX_DESC_ADV(R, i)	    \
+#define IXGBE_RX_DESC(R, i)	    \
 	(&(((union ixgbe_adv_rx_desc *)((R)->desc))[i]))
-#define IXGBE_TX_DESC_ADV(R, i)	    \
+#define IXGBE_TX_DESC(R, i)	    \
 	(&(((union ixgbe_adv_tx_desc *)((R)->desc))[i]))
-#define IXGBE_TX_CTXTDESC_ADV(R, i)	    \
+#define IXGBE_TX_CTXTDESC(R, i)	    \
 	(&(((struct ixgbe_adv_tx_context_desc *)((R)->desc))[i]))
 
 #define IXGBE_MAX_JUMBO_FRAME_SIZE        16128
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 1f31a04..1214fc1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -1725,7 +1725,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_ring *rx_ring,
 	/* initialize next to clean and descriptor values */
 	rx_ntc = rx_ring->next_to_clean;
 	tx_ntc = tx_ring->next_to_clean;
-	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, rx_ntc);
+	rx_desc = IXGBE_RX_DESC(rx_ring, rx_ntc);
 	staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 
 	while (staterr & IXGBE_RXD_STAT_DD) {
@@ -1756,7 +1756,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_ring *rx_ring,
 			tx_ntc = 0;
 
 		/* fetch next descriptor */
-		rx_desc = IXGBE_RX_DESC_ADV(rx_ring, rx_ntc);
+		rx_desc = IXGBE_RX_DESC(rx_ring, rx_ntc);
 		staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 	}
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index b0469dd..381d4dc 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -366,7 +366,7 @@ static void ixgbe_dump(struct ixgbe_adapter *adapter)
 			"leng  ntw timestamp        bi->skb\n");
 
 		for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
-			tx_desc = IXGBE_TX_DESC_ADV(tx_ring, i);
+			tx_desc = IXGBE_TX_DESC(tx_ring, i);
 			tx_buffer_info = &tx_ring->tx_buffer_info[i];
 			u0 = (struct my_u0 *)tx_desc;
 			pr_info("T [0x%03X]    %016llX %016llX %016llX"
@@ -447,7 +447,7 @@ rx_ring_summary:
 
 		for (i = 0; i < rx_ring->count; i++) {
 			rx_buffer_info = &rx_ring->rx_buffer_info[i];
-			rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
+			rx_desc = IXGBE_RX_DESC(rx_ring, i);
 			u0 = (struct my_u0 *)rx_desc;
 			staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 			if (staterr & IXGBE_RXD_STAT_DD) {
@@ -754,7 +754,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
 	u16 i = tx_ring->next_to_clean;
 
 	tx_buffer = &tx_ring->tx_buffer_info[i];
-	tx_desc = IXGBE_TX_DESC_ADV(tx_ring, i);
+	tx_desc = IXGBE_TX_DESC(tx_ring, i);
 
 	for (; budget; budget--) {
 		union ixgbe_adv_tx_desc *eop_desc = tx_buffer->next_to_watch;
@@ -795,7 +795,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
 				i = 0;
 
 				tx_buffer = tx_ring->tx_buffer_info;
-				tx_desc = IXGBE_TX_DESC_ADV(tx_ring, 0);
+				tx_desc = IXGBE_TX_DESC(tx_ring, 0);
 			}
 
 		} while (eop_desc);
@@ -812,7 +812,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
 	if (check_for_tx_hang(tx_ring) && ixgbe_check_tx_hang(tx_ring)) {
 		/* schedule immediate reset if we believe we hung */
 		struct ixgbe_hw *hw = &adapter->hw;
-		tx_desc = IXGBE_TX_DESC_ADV(tx_ring, i);
+		tx_desc = IXGBE_TX_DESC(tx_ring, i);
 		e_err(drv, "Detected Tx Unit Hang\n"
 			"  Tx Queue             <%d>\n"
 			"  TDH, TDT             <%x>, <%x>\n"
@@ -1180,7 +1180,7 @@ void ixgbe_alloc_rx_buffers(struct ixgbe_ring *rx_ring, u16 cleaned_count)
 	if (!cleaned_count || !rx_ring->netdev)
 		return;
 
-	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
+	rx_desc = IXGBE_RX_DESC(rx_ring, i);
 	bi = &rx_ring->rx_buffer_info[i];
 	i -= rx_ring->count;
 
@@ -1205,7 +1205,7 @@ void ixgbe_alloc_rx_buffers(struct ixgbe_ring *rx_ring, u16 cleaned_count)
 		bi++;
 		i++;
 		if (unlikely(!i)) {
-			rx_desc = IXGBE_RX_DESC_ADV(rx_ring, 0);
+			rx_desc = IXGBE_RX_DESC(rx_ring, 0);
 			bi = rx_ring->rx_buffer_info;
 			i -= rx_ring->count;
 		}
@@ -1468,7 +1468,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 	u16 cleaned_count = 0;
 
 	i = rx_ring->next_to_clean;
-	rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
+	rx_desc = IXGBE_RX_DESC(rx_ring, i);
 
 	while (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_DD)) {
 		u32 upper_len = 0;
@@ -1542,7 +1542,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		if (i == rx_ring->count)
 			i = 0;
 
-		next_rxd = IXGBE_RX_DESC_ADV(rx_ring, i);
+		next_rxd = IXGBE_RX_DESC(rx_ring, i);
 		prefetch(next_rxd);
 		cleaned_count++;
 
@@ -6469,7 +6469,7 @@ void ixgbe_tx_ctxtdesc(struct ixgbe_ring *tx_ring, u32 vlan_macip_lens,
 	struct ixgbe_adv_tx_context_desc *context_desc;
 	u16 i = tx_ring->next_to_use;
 
-	context_desc = IXGBE_TX_CTXTDESC_ADV(tx_ring, i);
+	context_desc = IXGBE_TX_CTXTDESC(tx_ring, i);
 
 	i++;
 	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
@@ -6702,7 +6702,7 @@ static void ixgbe_tx_map(struct ixgbe_ring *tx_ring,
 	cmd_type = ixgbe_tx_cmd_type(tx_flags);
 	olinfo_status = ixgbe_tx_olinfo_status(tx_flags, paylen);
 
-	tx_desc = IXGBE_TX_DESC_ADV(tx_ring, i);
+	tx_desc = IXGBE_TX_DESC(tx_ring, i);
 
 	for (;;) {
 		while (size > IXGBE_MAX_DATA_PER_TXD) {
@@ -6717,7 +6717,7 @@ static void ixgbe_tx_map(struct ixgbe_ring *tx_ring,
 			tx_desc++;
 			i++;
 			if (i == tx_ring->count) {
-				tx_desc = IXGBE_TX_DESC_ADV(tx_ring, 0);
+				tx_desc = IXGBE_TX_DESC(tx_ring, 0);
 				i = 0;
 			}
 		}
@@ -6753,7 +6753,7 @@ static void ixgbe_tx_map(struct ixgbe_ring *tx_ring,
 		tx_desc++;
 		i++;
 		if (i == tx_ring->count) {
-			tx_desc = IXGBE_TX_DESC_ADV(tx_ring, 0);
+			tx_desc = IXGBE_TX_DESC(tx_ring, 0);
 			i = 0;
 		}
 	}
-- 
1.7.7.6

[net-next 6/7] ixgbe: Combine post-DMA processing of sk_buff fields into single function

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change combines a number of post-DMA Rx packet processing functions
into a single function.  The advantage of this is that it combines most of
the Rx descriptor processing into one spot so it should all be warm in the
cache.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      |    3 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  127 +++++++++++++-----------
 2 files changed, 71 insertions(+), 59 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 882a580..2807a25 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -190,6 +190,7 @@ struct ixgbe_rx_queue_stats {
 	u64 non_eop_descs;
 	u64 alloc_rx_page_failed;
 	u64 alloc_rx_buff_failed;
+	u64 csum_err;
 };
 
 enum ixbge_ring_state_t {
@@ -198,6 +199,7 @@ enum ixbge_ring_state_t {
 	__IXGBE_HANG_CHECK_ARMED,
 	__IXGBE_RX_PS_ENABLED,
 	__IXGBE_RX_RSC_ENABLED,
+	__IXGBE_RX_CSUM_UDP_ZERO_ERR,
 };
 
 #define ring_is_ps_enabled(ring) \
@@ -379,7 +381,6 @@ struct ixgbe_adapter {
 	 * thus the additional *_CAPABLE flags.
 	 */
 	u32 flags;
-#define IXGBE_FLAG_RX_CSUM_ENABLED              (u32)(1)
 #define IXGBE_FLAG_MSI_CAPABLE                  (u32)(1 << 1)
 #define IXGBE_FLAG_MSI_ENABLED                  (u32)(1 << 2)
 #define IXGBE_FLAG_MSIX_CAPABLE                 (u32)(1 << 3)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 381d4dc..ac1d925 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -991,10 +991,12 @@ static int __ixgbe_notify_dca(struct device *dev, void *data)
 }
 #endif /* CONFIG_IXGBE_DCA */
 
-static inline void ixgbe_rx_hash(union ixgbe_adv_rx_desc *rx_desc,
+static inline void ixgbe_rx_hash(struct ixgbe_ring *ring,
+				 union ixgbe_adv_rx_desc *rx_desc,
 				 struct sk_buff *skb)
 {
-	skb->rxhash = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
+	if (ring->netdev->features & NETIF_F_RXHASH)
+		skb->rxhash = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 }
 
 /**
@@ -1016,50 +1018,25 @@ static inline bool ixgbe_rx_is_fcoe(struct ixgbe_adapter *adapter,
 }
 
 /**
- * ixgbe_receive_skb - Send a completed packet up the stack
- * @adapter: board private structure
- * @skb: packet to send up
- * @rx_ring: rx descriptor ring (for a specific queue) to setup
- * @rx_desc: rx descriptor
- **/
-static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
-			      struct sk_buff *skb,
-			      struct ixgbe_ring *ring,
-			      union ixgbe_adv_rx_desc *rx_desc)
-{
-	struct ixgbe_adapter *adapter = q_vector->adapter;
-
-	if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_VP)) {
-		u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
-		__vlan_hwaccel_put_tag(skb, vid);
-	}
-
-	if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
-		napi_gro_receive(&q_vector->napi, skb);
-	else
-		netif_rx(skb);
-}
-
-/**
  * ixgbe_rx_checksum - indicate in skb if hw indicated a good cksum
- * @adapter: address of board private structure
- * @status_err: hardware indication of status of receive
+ * @ring: structure containing ring specific data
+ * @rx_desc: current Rx descriptor being processed
  * @skb: skb currently being received and modified
  **/
-static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
+static inline void ixgbe_rx_checksum(struct ixgbe_ring *ring,
 				     union ixgbe_adv_rx_desc *rx_desc,
 				     struct sk_buff *skb)
 {
-	skb->ip_summed = CHECKSUM_NONE;
+	skb_checksum_none_assert(skb);
 
 	/* Rx csum disabled */
-	if (!(adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED))
+	if (!(ring->netdev->features & NETIF_F_RXCSUM))
 		return;
 
 	/* if IP and error */
 	if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_IPCS) &&
 	    ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_IPE)) {
-		adapter->hw_csum_rx_error++;
+		ring->rx_stats.csum_err++;
 		return;
 	}
 
@@ -1073,11 +1050,11 @@ static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
 		 * 82599 errata, UDP frames with a 0 checksum can be marked as
 		 * checksum errors.
 		 */
-		if ((pkt_info & IXGBE_RXDADV_PKTTYPE_UDP) &&
-		    (adapter->hw.mac.type == ixgbe_mac_82599EB))
+		if ((pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_UDP)) &&
+		    test_bit(__IXGBE_RX_CSUM_UDP_ZERO_ERR, &ring->state))
 			return;
 
-		adapter->hw_csum_rx_error++;
+		ring->rx_stats.csum_err++;
 		return;
 	}
 
@@ -1115,9 +1092,6 @@ static bool ixgbe_alloc_mapped_skb(struct ixgbe_ring *rx_ring,
 			rx_ring->rx_stats.alloc_rx_buff_failed++;
 			return false;
 		}
-
-		/* initialize skb for ring */
-		skb_record_rx_queue(skb, rx_ring->queue_index);
 	}
 
 	dma = dma_map_single(rx_ring->dev, skb->data,
@@ -1451,17 +1425,58 @@ static void ixgbe_update_rsc_stats(struct ixgbe_ring *rx_ring,
 	IXGBE_CB(skb)->append_cnt = 0;
 }
 
+/**
+ * ixgbe_process_skb_fields - Populate skb header fields from Rx descriptor
+ * @rx_ring: rx descriptor ring packet is being transacted on
+ * @rx_desc: pointer to the EOP Rx descriptor
+ * @skb: pointer to current skb being populated
+ *
+ * This function checks the ring, descriptor, and packet information in
+ * order to populate the hash, checksum, VLAN, timestamp, protocol, and
+ * other fields within the skb.
+ **/
+static void ixgbe_process_skb_fields(struct ixgbe_ring *rx_ring,
+				     union ixgbe_adv_rx_desc *rx_desc,
+				     struct sk_buff *skb)
+{
+	ixgbe_update_rsc_stats(rx_ring, skb);
+
+	ixgbe_rx_hash(rx_ring, rx_desc, skb);
+
+	ixgbe_rx_checksum(rx_ring, rx_desc, skb);
+
+	if (ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_VP)) {
+		u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
+		__vlan_hwaccel_put_tag(skb, vid);
+	}
+
+	skb_record_rx_queue(skb, rx_ring->queue_index);
+
+	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
+}
+
+static void ixgbe_rx_skb(struct ixgbe_q_vector *q_vector,
+			 struct sk_buff *skb)
+{
+	struct ixgbe_adapter *adapter = q_vector->adapter;
+
+	if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
+		napi_gro_receive(&q_vector->napi, skb);
+	else
+		netif_rx(skb);
+}
+
 static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			       struct ixgbe_ring *rx_ring,
 			       int budget)
 {
-	struct ixgbe_adapter *adapter = q_vector->adapter;
 	union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
 	struct ixgbe_rx_buffer *rx_buffer_info;
 	struct sk_buff *skb;
 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 	const int current_node = numa_node_id();
 #ifdef IXGBE_FCOE
+	struct ixgbe_adapter *adapter = q_vector->adapter;
 	int ddp_bytes = 0;
 #endif /* IXGBE_FCOE */
 	u16 i;
@@ -1588,8 +1603,6 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			goto next_desc;
 		}
 
-		ixgbe_update_rsc_stats(rx_ring, skb);
-
 		/* ERR_MASK will only have valid bits if EOP set */
 		if (unlikely(ixgbe_test_staterr(rx_desc,
 					    IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
@@ -1597,15 +1610,13 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			goto next_desc;
 		}
 
-		ixgbe_rx_checksum(adapter, rx_desc, skb);
-		if (adapter->netdev->features & NETIF_F_RXHASH)
-			ixgbe_rx_hash(rx_desc, skb);
-
 		/* probably a little skewed due to removing CRC */
 		total_rx_bytes += skb->len;
 		total_rx_packets++;
 
-		skb->protocol = eth_type_trans(skb, rx_ring->netdev);
+		/* populate checksum, timestamp, VLAN, and protocol */
+		ixgbe_process_skb_fields(rx_ring, rx_desc, skb);
+
 #ifdef IXGBE_FCOE
 		/* if ddp, not passing to ULD unless for FCP_RSP or error */
 		if (ixgbe_rx_is_fcoe(adapter, rx_desc)) {
@@ -1616,7 +1627,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			}
 		}
 #endif /* IXGBE_FCOE */
-		ixgbe_receive_skb(q_vector, skb, rx_ring, rx_desc);
+		ixgbe_rx_skb(q_vector, skb);
 
 		budget--;
 next_desc:
@@ -4851,6 +4862,13 @@ static int ixgbe_alloc_queues(struct ixgbe_adapter *adapter)
 		ring->dev = &adapter->pdev->dev;
 		ring->netdev = adapter->netdev;
 
+		/*
+		 * 82599 errata, UDP frames with a 0 checksum can be marked as
+		 * checksum errors.
+		 */
+		if (adapter->hw.mac.type == ixgbe_mac_82599EB)
+			set_bit(__IXGBE_RX_CSUM_UDP_ZERO_ERR, &ring->state);
+
 		adapter->rx_ring[rx] = ring;
 	}
 
@@ -5255,9 +5273,6 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
 		return -EIO;
 	}
 
-	/* enable rx csum by default */
-	adapter->flags |= IXGBE_FLAG_RX_CSUM_ENABLED;
-
 	/* get assigned NUMA node */
 	adapter->node = dev_to_node(&pdev->dev);
 
@@ -5748,7 +5763,7 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
 	u32 i, missed_rx = 0, mpc, bprc, lxon, lxoff, xon_off_tot;
 	u64 non_eop_descs = 0, restart_queue = 0, tx_busy = 0;
 	u64 alloc_rx_page_failed = 0, alloc_rx_buff_failed = 0;
-	u64 bytes = 0, packets = 0;
+	u64 bytes = 0, packets = 0, hw_csum_rx_error = 0;
 #ifdef IXGBE_FCOE
 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 	unsigned int cpu;
@@ -5778,12 +5793,14 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
 		non_eop_descs += rx_ring->rx_stats.non_eop_descs;
 		alloc_rx_page_failed += rx_ring->rx_stats.alloc_rx_page_failed;
 		alloc_rx_buff_failed += rx_ring->rx_stats.alloc_rx_buff_failed;
+		hw_csum_rx_error += rx_ring->rx_stats.csum_err;
 		bytes += rx_ring->stats.bytes;
 		packets += rx_ring->stats.packets;
 	}
 	adapter->non_eop_descs = non_eop_descs;
 	adapter->alloc_rx_page_failed = alloc_rx_page_failed;
 	adapter->alloc_rx_buff_failed = alloc_rx_buff_failed;
+	adapter->hw_csum_rx_error = hw_csum_rx_error;
 	netdev->stats.rx_bytes = bytes;
 	netdev->stats.rx_packets = packets;
 
@@ -7412,12 +7429,6 @@ static int ixgbe_set_features(struct net_device *netdev,
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 	bool need_reset = false;
 
-	/* If Rx checksum is disabled, then RSC/LRO should also be disabled */
-	if (!(data & NETIF_F_RXCSUM))
-		adapter->flags &= ~IXGBE_FLAG_RX_CSUM_ENABLED;
-	else
-		adapter->flags |= IXGBE_FLAG_RX_CSUM_ENABLED;
-
 	/* Make sure RSC matches LRO, reset if change */
 	if (!!(data & NETIF_F_LRO) !=
 	     !!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)) {
-- 
1.7.7.6

[net-next 7/7] skbuff: Move rxhash and vlan_tci to consolidate holes in sk_buff

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change helps to reduce the overall size of the sk_buff by moving
rxhash and vlan_tci so that the u16 values and u8 bitfields can be better
combined to create only one hole instead of multiple.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 include/linux/skbuff.h |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 50db9b0..2b7317f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -438,6 +438,11 @@ struct sk_buff {
 #endif
 
 	int			skb_iif;
+
+	__u32			rxhash;
+
+	__u16			vlan_tci;
+
 #ifdef CONFIG_NET_SCHED
 	__u16			tc_index;	/* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT
@@ -445,8 +450,6 @@ struct sk_buff {
 #endif
 #endif
 
-	__u32			rxhash;
-
 	__u16			queue_mapping;
 	kmemcheck_bitfield_begin(flags2);
 #ifdef CONFIG_IPV6_NDISC_NODETYPE
@@ -470,8 +473,6 @@ struct sk_buff {
 		__u32		dropcount;
 	};
 
-	__u16			vlan_tci;
-
 	sk_buff_data_t		transport_header;
 	sk_buff_data_t		network_header;
 	sk_buff_data_t		mac_header;
-- 
1.7.7.6

Re: [net-next 4/7] ixgbe: Add function for testing status bits in Rx descriptor

[Ben Hutchings]

On Fri, 2012-02-10 at 16:08 -0800, Jeff Kirsher wrote:
> From: Alexander Duyck <alexander.h.duyck@intel.com>
> 
> This change adds a small function for testing Rx status bits in the
> descriptor.  The advantage to this is that we can avoid unnecessary
> byte swaps on big endian systems.
[...]
> +	/* unmap the sg list when FCPRSP is received */
> +	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
[...]

cpu_to_le32() works as a compile-time constant when given a constant
argument.  You shouldn't need this ugly __constant_ prefix.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: [net-next 0/7][pull request] Intel Wired LAN Driver Updates

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Fri, 10 Feb 2012 16:08:17 -0800

> The following series contains updates to ixgbe and skbuff.
> The skbuff patch helps reduce the overall size of sk_buff and the
> remaining patches are against ixgbe.  They do the following:
>  - refactor RSC and address that RSC was not setting GSO size
>  - combine post-DMA processing of sk_buff fields into 1 function
>  - drop _ADV since all descriptors are advanced
>  - improvements in the use of clear and status bits on Rx
> 
> The following are changes since commit d9dd966d7fc088a6bed991c2b1e2fba4485e0a31:
>   igb: fix warning about unused function
> and are available in the git repository at:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next master

Pulled, thanks.

Re: [net-next 4/7] ixgbe: Add function for testing status bits in Rx descriptor

[Alexander Duyck]

On 02/11/2012 11:06 AM, Ben Hutchings wrote:
> On Fri, 2012-02-10 at 16:08 -0800, Jeff Kirsher wrote:
>> From: Alexander Duyck <alexander.h.duyck@intel.com>
>>
>> This change adds a small function for testing Rx status bits in the
>> descriptor.  The advantage to this is that we can avoid unnecessary
>> byte swaps on big endian systems.
> [...]
>> +	/* unmap the sg list when FCPRSP is received */
>> +	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
> [...]
>
> cpu_to_le32() works as a compile-time constant when given a constant
> argument.  You shouldn't need this ugly __constant_ prefix.
>
> Ben.
>

If that is the case then what is the point of even having the
__constant_ prefixed version of these macros anyway?  I ask because I
know we have had people submit patches in the past replacing htons calls
with __constant_htons and the like and nobody has ever spoken up before
to indicate that these were unnecessary.

Why don't you submit patches to get rid of these calls from the kernel
all together and just replace references to them with their non-prefixed
counterparts?  Then you wouldn't have to worry about changes like this
being submitted in the future.

Alex

Re: [net-next 4/7] ixgbe: Add function for testing status bits in Rx descriptor

[Ben Hutchings]

On Mon, 2012-02-13 at 09:21 -0800, Alexander Duyck wrote:
> On 02/11/2012 11:06 AM, Ben Hutchings wrote:
> > On Fri, 2012-02-10 at 16:08 -0800, Jeff Kirsher wrote:
> >> From: Alexander Duyck <alexander.h.duyck@intel.com>
> >>
> >> This change adds a small function for testing Rx status bits in the
> >> descriptor.  The advantage to this is that we can avoid unnecessary
> >> byte swaps on big endian systems.
> > [...]
> >> +	/* unmap the sg list when FCPRSP is received */
> >> +	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
> > [...]
> >
> > cpu_to_le32() works as a compile-time constant when given a constant
> > argument.  You shouldn't need this ugly __constant_ prefix.
> >
> > Ben.
> >
> 
> If that is the case then what is the point of even having the
> __constant_ prefixed version of these macros anyway?  I ask because I
> know we have had people submit patches in the past replacing htons calls
> with __constant_htons and the like and nobody has ever spoken up before
> to indicate that these were unnecessary.
[...]

Probably for backward-compatibility, as this wasn't true before Linux
2.6.22.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.