diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h b/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h index 5107c4f03feb..c41e0975eb73 100644 --- a/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h +++ b/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h @@ -71,12 +71,29 @@ struct nfp_nfdk_tx_desc { }; }; +/* The device don't make use of the 2 or 3 least significant bits of the address + * due to alignment constraints. The driver can make use of those bits to carry + * information about the buffer before giving it to the device. + * + * NOTE: The driver must clear the lower bits before handing the buffer to the + * device. + * + * - NFDK_TX_BUF_INFO_SOP - Start of a packet + * Mark the buffer as a start of a packet. This is used in the XDP TX process + * to stash virtual and DMA address so that they can be recycled when the TX + * operation is completed. + */ +#define NFDK_TX_BUF_PTR(val) ((val) & ~(sizeof(void *) - 1)) +#define NFDK_TX_BUF_INFO(val) ((val) & (sizeof(void *) - 1)) +#define NFDK_TX_BUF_INFO_SOP BIT(0) + struct nfp_nfdk_tx_buf { union { /* First slot */ union { struct sk_buff *skb; void *frag; + unsigned long val; }; /* 1 + nr_frags next slots */ |