Dear Tirthendu,
Thank you for your patch.
Am 15.02.23 um 13:43 schrieb Tirthendu Sarkar:
Truesize is now passed directly to i40e_rx_buffer_flip() instead of size
so that it does not need to recalculate truesize from size using
i40e_rx_frame_truesize() before adjusting page offset.
Did the compiler not optimize that well enough?
With these change the function can now be used during skb building and
adding frags. In later patches it will also be easier for adjusting
page offsets for multi-buffers.
Why couldn’t the function be used before?
Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@xxxxxxxxx>
---
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 54 ++++++++-------------
1 file changed, 19 insertions(+), 35 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index a7fba294a8f4..019abd7273a2 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2018,6 +2018,21 @@ static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer,
return true;
}
+/**
+ * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region
+ * @rx_buffer: Rx buffer to adjust
+ * @size: Size of adjustment
+ **/
+static void i40e_rx_buffer_flip(struct i40e_rx_buffer *rx_buffer,
+ unsigned int truesize)
+{
+#if (PAGE_SIZE < 8192)
+ rx_buffer->page_offset ^= truesize;
+#else
+ rx_buffer->page_offset += truesize;
+#endif
It’d be great if you sent a patch on top, doing the check not in the
preprocessor but in native C code.
+}
+
/**
* i40e_add_rx_frag - Add contents of Rx buffer to sk_buff
* @rx_ring: rx descriptor ring to transact packets on
@@ -2045,11 +2060,7 @@ static void i40e_add_rx_frag(struct i40e_ring *rx_ring,
rx_buffer->page_offset, size, truesize);
/* page is being used so we must update the page offset */
-#if (PAGE_SIZE < 8192)
- rx_buffer->page_offset ^= truesize;
-#else
- rx_buffer->page_offset += truesize;
-#endif
+ i40e_rx_buffer_flip(rx_buffer, truesize);
}
/**
@@ -2154,11 +2165,7 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
size, truesize);
/* buffer is used by skb, update page_offset */
-#if (PAGE_SIZE < 8192)
- rx_buffer->page_offset ^= truesize;
-#else
- rx_buffer->page_offset += truesize;
-#endif
+ i40e_rx_buffer_flip(rx_buffer, truesize);
} else {
/* buffer is unused, reset bias back to rx_buffer */
rx_buffer->pagecnt_bias++;
@@ -2209,11 +2216,7 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
skb_metadata_set(skb, metasize);
/* buffer is used by skb, update page_offset */
-#if (PAGE_SIZE < 8192)
- rx_buffer->page_offset ^= truesize;
-#else
- rx_buffer->page_offset += truesize;
-#endif
+ i40e_rx_buffer_flip(rx_buffer, truesize);
return skb;
}
@@ -2326,25 +2329,6 @@ static int i40e_run_xdp(struct i40e_ring *rx_ring, struct xdp_buff *xdp, struct
return result;
}
-/**
- * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region
- * @rx_ring: Rx ring
- * @rx_buffer: Rx buffer to adjust
- * @size: Size of adjustment
- **/
-static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring,
- struct i40e_rx_buffer *rx_buffer,
- unsigned int size)
-{
- unsigned int truesize = i40e_rx_frame_truesize(rx_ring, size);
-
-#if (PAGE_SIZE < 8192)
- rx_buffer->page_offset ^= truesize;
-#else
- rx_buffer->page_offset += truesize;
-#endif
-}
-
/**
* i40e_xdp_ring_update_tail - Updates the XDP Tx ring tail register
* @xdp_ring: XDP Tx ring
@@ -2513,7 +2497,7 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
if (xdp_res) {
if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR)) {
xdp_xmit |= xdp_res;
- i40e_rx_buffer_flip(rx_ring, rx_buffer, size);
+ i40e_rx_buffer_flip(rx_buffer, xdp.frame_sz);
Why is `xdp.frame_sz` the correct size now?
} else {
rx_buffer->pagecnt_bias++;
}
Kind regards,
Paul
