linux-kernel - [PATCH 5.10 04/57] net: octeontx2: Make sure the buffer is 128 byte aligned

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Date:   Fri,  5 Feb 2021 15:06:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Subbaraya Sundeep <sbhatta@...vell.com>,
        Kevin Hao <haokexin@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.10 04/57] net: octeontx2: Make sure the buffer is 128 byte aligned

From: Kevin Hao <haokexin@...il.com>

commit db2805150a0f27c00ad286a29109397a7723adad upstream.

The octeontx2 hardware needs the buffer to be 128 byte aligned.
But in the current implementation of napi_alloc_frag(), it can't
guarantee the return address is 128 byte aligned even the request size
is a multiple of 128 bytes, so we have to request an extra 128 bytes and
use the PTR_ALIGN() to make sure that the buffer is aligned correctly.

Fixes: 7a36e4918e30 ("octeontx2-pf: Use the napi_alloc_frag() to alloc the pool buffers")
Reported-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Kevin Hao <haokexin@...il.com>
Tested-by: Subbaraya Sundeep <sbhatta@...vell.com>
Link: https://lore.kernel.org/r/20210121070906.25380-1-haokexin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -473,10 +473,11 @@ dma_addr_t __otx2_alloc_rbuf(struct otx2
 	dma_addr_t iova;
 	u8 *buf;
 
-	buf = napi_alloc_frag(pool->rbsize);
+	buf = napi_alloc_frag(pool->rbsize + OTX2_ALIGN);
 	if (unlikely(!buf))
 		return -ENOMEM;
 
+	buf = PTR_ALIGN(buf, OTX2_ALIGN);
 	iova = dma_map_single_attrs(pfvf->dev, buf, pool->rbsize,
 				    DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
 	if (unlikely(dma_mapping_error(pfvf->dev, iova))) {