diff mbox series

[bpf-next,3/6] i40e: remove unnecessary sw_ring access from xsk Tx

Message ID 1604498942-24274-4-git-send-email-magnus.karlsson@gmail.com
State Not Applicable
Delegated to: BPF Maintainers
Headers show
Series xsk: i40e: Tx performance improvements | expand

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Context Check Description
jkicinski/cover_letter success Link
jkicinski/fixes_present success Link
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jkicinski/tree_selection success Clearly marked for bpf-next
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jkicinski/source_inline success Was 0 now: 0
jkicinski/verify_signedoff success Link
jkicinski/module_param success Was 0 now: 0
jkicinski/build_32bit fail Errors and warnings before: 5 this patch: 5
jkicinski/kdoc success Errors and warnings before: 0 this patch: 0
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jkicinski/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
jkicinski/header_inline success Link
jkicinski/stable success Stable not CCed

Commit Message

Magnus Karlsson Nov. 4, 2020, 2:08 p.m. UTC 
From: Magnus Karlsson <magnus.karlsson@intel.com>

Remove the unnecessary access to the software ring for the AF_XDP
zero-copy driver. This was used to record the length of the packet so
that the driver Tx completion code could sum this up to produce the
total bytes sent. This is now performed during the transmission of the
packet, so no need to record this in the software ring.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_xsk.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

Comments

John Fastabend Nov. 9, 2020, 8:48 p.m. UTC | #1 
Magnus Karlsson wrote:
> From: Magnus Karlsson <magnus.karlsson@intel.com>
> 
> Remove the unnecessary access to the software ring for the AF_XDP
> zero-copy driver. This was used to record the length of the packet so
> that the driver Tx completion code could sum this up to produce the
> total bytes sent. This is now performed during the transmission of the
> packet, so no need to record this in the software ring.
> 
> Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
> ---

Acked-by: John Fastabend <john.fastabend@gmail.com
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index f8815b3..eabe1a3 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -394,7 +394,6 @@  static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 {
 	unsigned int sent_frames = 0, total_bytes = 0;
 	struct i40e_tx_desc *tx_desc = NULL;
-	struct i40e_tx_buffer *tx_bi;
 	struct xdp_desc desc;
 	dma_addr_t dma;
 
@@ -406,9 +405,6 @@  static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 		xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma,
 						 desc.len);
 
-		tx_bi = &xdp_ring->tx_bi[xdp_ring->next_to_use];
-		tx_bi->bytecount = desc.len;
-
 		tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use);
 		tx_desc->buffer_addr = cpu_to_le64(dma);
 		tx_desc->cmd_type_offset_bsz =
@@ -417,7 +413,7 @@  static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 				   0, desc.len, 0);
 
 		sent_frames++;
-		total_bytes += tx_bi->bytecount;
+		total_bytes += desc.len;
 
 		xdp_ring->next_to_use++;
 		if (xdp_ring->next_to_use == xdp_ring->count)