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nfp: prepare for more TX metadata prepend

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Subsequent patches will add support for more TX metadata fields.
Prepare for this by handling an additional double word - firmware
handle as metadata type 7.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-06-05 14:11:37 -07:00 committed by David S. Miller
parent 232eeb1f84
commit 5584c0f825
2 changed files with 35 additions and 10 deletions
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44
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View file

@ -808,24 +808,47 @@ static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
tx_ring->wr_ptr_add = 0;
}
static int nfp_net_prep_port_id(struct sk_buff *skb)
static int nfp_net_prep_tx_meta(struct sk_buff *skb, u64 tls_handle)
{
struct metadata_dst *md_dst = skb_metadata_dst(skb);
unsigned char *data;
u32 meta_id = 0;
int md_bytes;
if (likely(!md_dst))
return 0;
if (unlikely(md_dst->type != METADATA_HW_PORT_MUX))
if (likely(!md_dst && !tls_handle))
return 0;
if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) {
if (!tls_handle)
return 0;
md_dst = NULL;
}
if (unlikely(skb_cow_head(skb, 8)))
md_bytes = 4 + !!md_dst * 4 + !!tls_handle * 8;
if (unlikely(skb_cow_head(skb, md_bytes)))
return -ENOMEM;
data = skb_push(skb, 8);
put_unaligned_be32(NFP_NET_META_PORTID, data);
put_unaligned_be32(md_dst->u.port_info.port_id, data + 4);
meta_id = 0;
data = skb_push(skb, md_bytes) + md_bytes;
if (md_dst) {
data -= 4;
put_unaligned_be32(md_dst->u.port_info.port_id, data);
meta_id = NFP_NET_META_PORTID;
}
if (tls_handle) {
/* conn handle is opaque, we just use u64 to be able to quickly
* compare it to zero
*/
data -= 8;
memcpy(data, &tls_handle, sizeof(tls_handle));
meta_id <<= NFP_NET_META_FIELD_SIZE;
meta_id |= NFP_NET_META_CONN_HANDLE;
}
return 8;
data -= 4;
put_unaligned_be32(meta_id, data);
return md_bytes;
}
/**
@ -848,6 +871,7 @@ static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
struct nfp_net_dp *dp;
dma_addr_t dma_addr;
unsigned int fsize;
u64 tls_handle = 0;
u16 qidx;
dp = &nn->dp;
@ -869,7 +893,7 @@ static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_BUSY;
}
md_bytes = nfp_net_prep_port_id(skb);
md_bytes = nfp_net_prep_tx_meta(skb, tls_handle);
if (unlikely(md_bytes < 0))
goto err_flush;

1
drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
View file

@ -44,6 +44,7 @@
#define NFP_NET_META_MARK 2
#define NFP_NET_META_PORTID 5
#define NFP_NET_META_CSUM 6 /* checksum complete type */
#define NFP_NET_META_CONN_HANDLE 7
#define NFP_META_PORT_ID_CTRL ~0U