Commit 195c3d46 authored by Bharat Bhushan's avatar Bharat Bhushan Committed by David S. Miller
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octeontx2-pf: map skb data as device writeable 



Crypto hardware need write permission for in-place encrypt
or decrypt operation on skb-data to support IPsec crypto
offload. That patch uses skb_unshare to make skb data writeable
for ipsec crypto offload and map skb fragment memory as
device read-write.

Signed-off-by: default avatarBharat Bhushan <bbhushan2@marvell.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7ea27457

drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c

+16 −2
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/bpf.h>

#include <linux/bpf_trace.h>

#include <net/ip6_checksum.h>

#include <net/xfrm.h>



#include "otx2_reg.h"

#include "otx2_common.h"
@@ -83,10 +84,17 @@ static unsigned int frag_num(unsigned int i) 
static dma_addr_t otx2_dma_map_skb_frag(struct otx2_nic *pfvf,

					struct sk_buff *skb, int seg, int *len)

{

	enum dma_data_direction dir = DMA_TO_DEVICE;

	const skb_frag_t *frag;

	struct page *page;

	int offset;



	/* Crypto hardware need write permission for ipsec crypto offload */

	if (unlikely(xfrm_offload(skb))) {

		dir = DMA_BIDIRECTIONAL;

		skb = skb_unshare(skb, GFP_ATOMIC);

	}



	/* First segment is always skb->data */

	if (!seg) {

		page = virt_to_page(skb->data);
@@ -98,16 +106,22 @@ static dma_addr_t otx2_dma_map_skb_frag(struct otx2_nic *pfvf, 
		offset = skb_frag_off(frag);

		*len = skb_frag_size(frag);

	}

	return otx2_dma_map_page(pfvf, page, offset, *len, DMA_TO_DEVICE);

	return otx2_dma_map_page(pfvf, page, offset, *len, dir);

}



static void otx2_dma_unmap_skb_frags(struct otx2_nic *pfvf, struct sg_list *sg)

{

	enum dma_data_direction dir = DMA_TO_DEVICE;

	struct sk_buff *skb = NULL;

	int seg;



	skb = (struct sk_buff *)sg->skb;

	if (unlikely(xfrm_offload(skb)))

		dir = DMA_BIDIRECTIONAL;



	for (seg = 0; seg < sg->num_segs; seg++) {

		otx2_dma_unmap_page(pfvf, sg->dma_addr[seg],

				    sg->size[seg], DMA_TO_DEVICE);

				    sg->size[seg], dir);

	}

	sg->num_segs = 0;

}