Re: [PATCH v2] {net,IB}/{rxe,usnic}: Utilize generic mac to eui32 function

Leon Romanovsky
2017-03-07T14:27:11Z

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On Mon, Mar 06, 2017 at 08:54:06PM +0200, Yuval Shaia wrote:
> This logic seems to be duplicated in (at least) three separate files.
> Move it to one place so code can be re-use.
>
> Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
> ---
> v0 -> v1:
> * Add missing #include
> * Rename to genaddrconf_ifid_eui48
> v1 -> v2:
> * Reset eui[0] to default if dev_id is used
> ---
> drivers/infiniband/hw/usnic/usnic_common_util.h | 11 +++--------
> drivers/infiniband/sw/rxe/rxe_net.c | 11 ++---------
> include/net/addrconf.h | 19 +++++++++++++------
> 3 files changed, 18 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/infiniband/hw/usnic/usnic_common_util.h b/drivers/infiniband/hw/usnic/usnic_common_util.h
> index b54986d..09871da 100644
> --- a/drivers/infiniband/hw/usnic/usnic_common_util.h
> +++ b/drivers/infiniband/hw/usnic/usnic_common_util.h
> @@ -34,6 +34,8 @@
> #ifndef USNIC_CMN_UTIL_H
> #define USNIC_CMN_UTIL_H
>
> +#include <net/addrconf.h>
> +
> static inline void
> usnic_mac_to_gid(const char *const mac, char *raw_gid)
> {
> @@ -57,14 +59,7 @@ usnic_mac_ip_to_gid(const char *const mac, const __be32 inaddr, char *raw_gid)
> raw_gid[1] = 0x80;
> memset(&raw_gid[2], 0, 2);
> memcpy(&raw_gid[4], &inaddr, 4);
> - raw_gid[8] = mac[0]^2;
> - raw_gid[9] = mac[1];
> - raw_gid[10] = mac[2];
> - raw_gid[11] = 0xff;
> - raw_gid[12] = 0xfe;
> - raw_gid[13] = mac[3];
> - raw_gid[14] = mac[4];
> - raw_gid[15] = mac[5];
> + genaddrconf_ifid_eui48(&raw_gid[8], mac);
> }
>
> static inline void
> diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
> index d8610960..90285c8 100644
> --- a/drivers/infiniband/sw/rxe/rxe_net.c
> +++ b/drivers/infiniband/sw/rxe/rxe_net.c
> @@ -38,6 +38,7 @@
> #include <linux/if_vlan.h>
> #include <net/udp_tunnel.h>
> #include <net/sch_generic.h>
> +#include <net/addrconf.h>
> #include <linux/netfilter.h>
> #include <rdma/ib_addr.h>
>
> @@ -86,18 +87,10 @@ struct rxe_recv_sockets recv_sockets;
>
> static __be64 rxe_mac_to_eui64(struct net_device *ndev)
> {
> - unsigned char *mac_addr = ndev->dev_addr;
> __be64 eui64;
> unsigned char *dst = (unsigned char *)&eui64;
>
> - dst[0] = mac_addr[0] ^ 2;
> - dst[1] = mac_addr[1];
> - dst[2] = mac_addr[2];
> - dst[3] = 0xff;
> - dst[4] = 0xfe;
> - dst[5] = mac_addr[3];
> - dst[6] = mac_addr[4];
> - dst[7] = mac_addr[5];
> + genaddrconf_ifid_eui48(dst, ndev->dev_addr);
>
> return eui64;
> }
> diff --git a/include/net/addrconf.h b/include/net/addrconf.h
> index 17c6fd8..cdfa73f 100644
> --- a/include/net/addrconf.h
> +++ b/include/net/addrconf.h
> @@ -103,12 +103,21 @@ int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
> u32 addr_flags, bool sllao, bool tokenized,
> __u32 valid_lft, u32 prefered_lft);
>
> +static inline void genaddrconf_ifid_eui48(u8 *eui, const char *const addr)
> +{
> + memcpy(eui, addr, 3);
> + eui[0] ^= 2;
> + eui[3] = 0xFF;
> + eui[4] = 0xFE;
> + memcpy(eui + 5, addr + 3, 3);
> +}
> +
> static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
> {
> if (dev->addr_len != ETH_ALEN)
> return -1;
> - memcpy(eui, dev->dev_addr, 3);
> - memcpy(eui + 5, dev->dev_addr + 3, 3);
> +
> + genaddrconf_ifid_eui48(eui, dev->dev_addr);
>
> /*
> * The zSeries OSA network cards can be shared among various
> @@ -124,13 +133,11 @@ static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
> * scope according to RFC2373.
> */
> if (dev->dev_id) {
> + eui[0] = dev->dev_addr[0];
> eui[3] = (dev->dev_id >> 8) & 0xFF;
> eui[4] = dev->dev_id & 0xFF;
> - } else {
> - eui[3] = 0xFF;
> - eui[4] = 0xFE;
> - eui[0] ^= 2;
> }
> +
> return 0;
> }

Technically, the code is correct now, but it doesn't look right
to set the value and restore it right after that.

Thanks

>
> --
> 2.7.4
>

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