Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
40GbE Intel Wired LAN Driver Updates 2021-02-12

This series contains updates to i40e, ice, and ixgbe drivers.

Maciej does cleanups on the following drivers.
For i40e, removes redundant check for XDP prog, cleans up no longer
relevant information, and removes an unused function argument.
For ice, removes local variable use, instead returning values directly.
Moves skb pointer from buffer to ring and removes an unneeded check for
xdp_prog in zero copy path. Also removes a redundant MTU check when
changing it.
For i40e, ice, and ixgbe, stores the rx_offset in the Rx ring as
the value is constant so there's no need for continual calls.

Bjorn folds a decrement into a while statement.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 48 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 580419813bb2..b7dc25da1202 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -375,6 +375,11 @@ void ice_clean_rx_ring(struct ice_ring *rx_ring)
 	if (!rx_ring->rx_buf)
 		return;
 
+	if (rx_ring->skb) {
+		dev_kfree_skb(rx_ring->skb);
+		rx_ring->skb = NULL;
+	}
+
 	if (rx_ring->xsk_pool) {
 		ice_xsk_clean_rx_ring(rx_ring);
 		goto rx_skip_free;
@@ -384,10 +389,6 @@ void ice_clean_rx_ring(struct ice_ring *rx_ring)
 	for (i = 0; i < rx_ring->count; i++) {
 		struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i];
 
-		if (rx_buf->skb) {
-			dev_kfree_skb(rx_buf->skb);
-			rx_buf->skb = NULL;
-		}
 		if (!rx_buf->page)
 			continue;
 
@@ -443,6 +444,22 @@ void ice_free_rx_ring(struct ice_ring *rx_ring)
 }
 
 /**
+ * ice_rx_offset - Return expected offset into page to access data
+ * @rx_ring: Ring we are requesting offset of
+ *
+ * Returns the offset value for ring into the data buffer.
+ */
+static unsigned int ice_rx_offset(struct ice_ring *rx_ring)
+{
+	if (ice_ring_uses_build_skb(rx_ring))
+		return ICE_SKB_PAD;
+	else if (ice_is_xdp_ena_vsi(rx_ring->vsi))
+		return XDP_PACKET_HEADROOM;
+
+	return 0;
+}
+
+/**
  * ice_setup_rx_ring - Allocate the Rx descriptors
  * @rx_ring: the Rx ring to set up
  *
@@ -476,6 +493,7 @@ int ice_setup_rx_ring(struct ice_ring *rx_ring)
 
 	rx_ring->next_to_use = 0;
 	rx_ring->next_to_clean = 0;
+	rx_ring->rx_offset = ice_rx_offset(rx_ring);
 
 	if (ice_is_xdp_ena_vsi(rx_ring->vsi))
 		WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
@@ -493,22 +511,6 @@ err:
 	return -ENOMEM;
 }
 
-/**
- * ice_rx_offset - Return expected offset into page to access data
- * @rx_ring: Ring we are requesting offset of
- *
- * Returns the offset value for ring into the data buffer.
- */
-static unsigned int ice_rx_offset(struct ice_ring *rx_ring)
-{
-	if (ice_ring_uses_build_skb(rx_ring))
-		return ICE_SKB_PAD;
-	else if (ice_is_xdp_ena_vsi(rx_ring->vsi))
-		return XDP_PACKET_HEADROOM;
-
-	return 0;
-}
-
 static unsigned int
 ice_rx_frame_truesize(struct ice_ring *rx_ring, unsigned int __maybe_unused size)
 {
@@ -517,8 +519,8 @@ ice_rx_frame_truesize(struct ice_ring *rx_ring, unsigned int __maybe_unused size
 #if (PAGE_SIZE < 8192)
 	truesize = ice_rx_pg_size(rx_ring) / 2; /* Must be power-of-2 */
 #else
-	truesize = ice_rx_offset(rx_ring) ?
-		SKB_DATA_ALIGN(ice_rx_offset(rx_ring) + size) +
+	truesize = rx_ring->rx_offset ?
+		SKB_DATA_ALIGN(rx_ring->rx_offset + size) +
 		SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) :
 		SKB_DATA_ALIGN(size);
 #endif
@@ -537,22 +539,20 @@ static int
 ice_run_xdp(struct ice_ring *rx_ring, struct xdp_buff *xdp,
 	    struct bpf_prog *xdp_prog)
 {
-	int err, result = ICE_XDP_PASS;
 	struct ice_ring *xdp_ring;
+	int err;
 	u32 act;
 
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 	switch (act) {
 	case XDP_PASS:
-		break;
+		return ICE_XDP_PASS;
 	case XDP_TX:
 		xdp_ring = rx_ring->vsi->xdp_rings[smp_processor_id()];
-		result = ice_xmit_xdp_buff(xdp, xdp_ring);
-		break;
+		return ice_xmit_xdp_buff(xdp, xdp_ring);
 	case XDP_REDIRECT:
 		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
-		result = !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED;
-		break;
+		return !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED;
 	default:
 		bpf_warn_invalid_xdp_action(act);
 		fallthrough;
@@ -560,11 +560,8 @@ ice_run_xdp(struct ice_ring *rx_ring, struct xdp_buff *xdp,
 		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 		fallthrough;
 	case XDP_DROP:
-		result = ICE_XDP_CONSUMED;
-		break;
+		return ICE_XDP_CONSUMED;
 	}
-
-	return result;
 }
 
 /**
@@ -656,7 +653,7 @@ ice_alloc_mapped_page(struct ice_ring *rx_ring, struct ice_rx_buf *bi)
 
 	bi->dma = dma;
 	bi->page = page;
-	bi->page_offset = ice_rx_offset(rx_ring);
+	bi->page_offset = rx_ring->rx_offset;
 	page_ref_add(page, USHRT_MAX - 1);
 	bi->pagecnt_bias = USHRT_MAX;
 
@@ -809,7 +806,7 @@ ice_add_rx_frag(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
 		struct sk_buff *skb, unsigned int size)
 {
 #if (PAGE_SIZE >= 8192)
-	unsigned int truesize = SKB_DATA_ALIGN(size + ice_rx_offset(rx_ring));
+	unsigned int truesize = SKB_DATA_ALIGN(size + rx_ring->rx_offset);
 #else
 	unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
 #endif
@@ -855,7 +852,6 @@ ice_reuse_rx_page(struct ice_ring *rx_ring, struct ice_rx_buf *old_buf)
 /**
  * ice_get_rx_buf - Fetch Rx buffer and synchronize data for use
  * @rx_ring: Rx descriptor ring to transact packets on
- * @skb: skb to be used
  * @size: size of buffer to add to skb
  * @rx_buf_pgcnt: rx_buf page refcount
  *
@@ -863,8 +859,8 @@ ice_reuse_rx_page(struct ice_ring *rx_ring, struct ice_rx_buf *old_buf)
  * for use by the CPU.
  */
 static struct ice_rx_buf *
-ice_get_rx_buf(struct ice_ring *rx_ring, struct sk_buff **skb,
-	       const unsigned int size, int *rx_buf_pgcnt)
+ice_get_rx_buf(struct ice_ring *rx_ring, const unsigned int size,
+	       int *rx_buf_pgcnt)
 {
 	struct ice_rx_buf *rx_buf;
 
@@ -876,7 +872,6 @@ ice_get_rx_buf(struct ice_ring *rx_ring, struct sk_buff **skb,
 		0;
 #endif
 	prefetchw(rx_buf->page);
-	*skb = rx_buf->skb;
 
 	if (!size)
 		return rx_buf;
@@ -1038,29 +1033,24 @@ ice_put_rx_buf(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
 
 	/* clear contents of buffer_info */
 	rx_buf->page = NULL;
-	rx_buf->skb = NULL;
 }
 
 /**
  * ice_is_non_eop - process handling of non-EOP buffers
  * @rx_ring: Rx ring being processed
  * @rx_desc: Rx descriptor for current buffer
- * @skb: Current socket buffer containing buffer in progress
  *
  * If the buffer is an EOP buffer, this function exits returning false,
  * otherwise return true indicating that this is in fact a non-EOP buffer.
  */
 static bool
-ice_is_non_eop(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc,
-	       struct sk_buff *skb)
+ice_is_non_eop(struct ice_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc)
 {
 	/* if we are the last buffer then there is nothing else to do */
 #define ICE_RXD_EOF BIT(ICE_RX_FLEX_DESC_STATUS0_EOF_S)
 	if (likely(ice_test_staterr(rx_desc, ICE_RXD_EOF)))
 		return false;
 
-	/* place skb in next buffer to be received */
-	rx_ring->rx_buf[rx_ring->next_to_clean].skb = skb;
 	rx_ring->rx_stats.non_eop_descs++;
 
 	return true;
@@ -1082,7 +1072,9 @@ int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
 {
 	unsigned int total_rx_bytes = 0, total_rx_pkts = 0, frame_sz = 0;
 	u16 cleaned_count = ICE_DESC_UNUSED(rx_ring);
+	unsigned int offset = rx_ring->rx_offset;
 	unsigned int xdp_res, xdp_xmit = 0;
+	struct sk_buff *skb = rx_ring->skb;
 	struct bpf_prog *xdp_prog = NULL;
 	struct xdp_buff xdp;
 	bool failure;
@@ -1095,11 +1087,9 @@ int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
 
 	/* start the loop to process Rx packets bounded by 'budget' */
 	while (likely(total_rx_pkts < (unsigned int)budget)) {
-		unsigned int offset = ice_rx_offset(rx_ring);
 		union ice_32b_rx_flex_desc *rx_desc;
 		struct ice_rx_buf *rx_buf;
 		unsigned char *hard_start;
-		struct sk_buff *skb;
 		unsigned int size;
 		u16 stat_err_bits;
 		int rx_buf_pgcnt;
@@ -1134,7 +1124,7 @@ int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget)
 			ICE_RX_FLX_DESC_PKT_LEN_M;
 
 		/* retrieve a buffer from the ring */
-		rx_buf = ice_get_rx_buf(rx_ring, &skb, size, &rx_buf_pgcnt);
+		rx_buf = ice_get_rx_buf(rx_ring, size, &rx_buf_pgcnt);
 
 		if (!size) {
 			xdp.data = NULL;
@@ -1196,7 +1186,7 @@ construct_skb:
 		cleaned_count++;
 
 		/* skip if it is NOP desc */
-		if (ice_is_non_eop(rx_ring, rx_desc, skb))
+		if (ice_is_non_eop(rx_ring, rx_desc))
 			continue;
 
 		stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S);
@@ -1226,6 +1216,7 @@ construct_skb:
 
 		/* send completed skb up the stack */
 		ice_receive_skb(rx_ring, skb, vlan_tag);
+		skb = NULL;
 
 		/* update budget accounting */
 		total_rx_pkts++;
@@ -1236,6 +1227,7 @@ construct_skb:
 
 	if (xdp_prog)
 		ice_finalize_xdp_rx(rx_ring, xdp_xmit);
+	rx_ring->skb = skb;
 
 	ice_update_rx_ring_stats(rx_ring, total_rx_pkts, total_rx_bytes);