From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH 3/7] net: fec_imx: Read data_length only once
Date: Mon, 17 Sep 2018 22:21:18 -0700 [thread overview]
Message-ID: <20180918052122.12248-4-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20180918052122.12248-1-andrew.smirnov@gmail.com>
Data length of a given Rx data descriptor isn't going to change until
that descriptor is processed and given back to HW. Re-work the code to
save and re-use that value instead.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/net/fec_imx.c | 31 +++++++++++++++++--------------
1 file changed, 17 insertions(+), 14 deletions(-)
diff --git a/drivers/net/fec_imx.c b/drivers/net/fec_imx.c
index 25e2425d6..36218f3c9 100644
--- a/drivers/net/fec_imx.c
+++ b/drivers/net/fec_imx.c
@@ -574,20 +574,23 @@ static int fec_recv(struct eth_device *dev)
if (bd_status & FEC_RBD_ERR) {
dev_warn(&dev->dev, "error frame: 0x%p 0x%08x\n",
rbd, bd_status);
- } else if ((bd_status & FEC_RBD_LAST) &&
- ((readw(&rbd->data_length) - 4) > 14)) {
- if (fec_is_imx28(fec))
- imx28_fix_endianess_rd(
- phys_to_virt(readl(&rbd->data_pointer)),
- (readw(&rbd->data_length) + 3) >> 2);
-
- /*
- * Get buffer address and size
- */
- frame = phys_to_virt(readl(&rbd->data_pointer));
- frame_length = readw(&rbd->data_length) - 4;
- net_receive(dev, frame->data, frame_length);
- len = frame_length;
+ } else if (bd_status & FEC_RBD_LAST) {
+ const uint16_t data_length = readw(&rbd->data_length);
+
+ if (data_length - 4 > 14) {
+ if (fec_is_imx28(fec))
+ imx28_fix_endianess_rd(
+ phys_to_virt(readl(&rbd->data_pointer)),
+ (data_length + 3) >> 2);
+
+ /*
+ * Get buffer address and size
+ */
+ frame = phys_to_virt(readl(&rbd->data_pointer));
+ frame_length = data_length - 4;
+ net_receive(dev, frame->data, frame_length);
+ len = frame_length;
+ }
}
/*
* free the current buffer, restart the engine
--
2.17.1
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next prev parent reply other threads:[~2018-09-18 5:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 5:21 [PATCH 0/7] non-coherent Rx buffers in FEC and some small fixes Andrey Smirnov
2018-09-18 5:21 ` [PATCH 1/7] net: fec_imx: Drop extra indentation level by exiting early Andrey Smirnov
2018-09-18 5:21 ` [PATCH 2/7] net: fec_imx: Don't check bd_status & FEC_RBD_ERR twice Andrey Smirnov
2018-09-18 5:21 ` Andrey Smirnov [this message]
2018-09-18 5:21 ` [PATCH 4/7] net: fec_imx: Drop struct fec_frame Andrey Smirnov
2018-09-18 5:21 ` [PATCH 5/7] net: fec_imx: Drop frame_length Andrey Smirnov
2018-09-18 5:21 ` [PATCH 6/7] net: fec_imx: Make use of readx_poll_timeout() macros Andrey Smirnov
2018-09-18 5:21 ` [PATCH 7/7] net: fec_imx: Do not use DMA coherent memory for Rx buffers Andrey Smirnov
2019-01-14 12:21 ` Uwe Kleine-König
2019-01-14 14:17 ` Uwe Kleine-König
2018-09-19 7:41 ` [PATCH 0/7] non-coherent Rx buffers in FEC and some small fixes Sascha Hauer
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