diff options
| author | Neil Horman <nhorman@tuxdriver.com> | 2011-07-26 06:05:37 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-27 22:39:30 -0700 |
| commit | d8873315065f1f527c7c380402cf59b1e1d0ae36 (patch) | |
| tree | 41a9c15f75b41657dd5370fe135f16c40b3eab64 | |
| parent | 894dc24ce75aa238ce96422a36b1537ccf2d8831 (diff) | |
net: add IFF_SKB_TX_SHARED flag to priv_flags
Pktgen attempts to transmit shared skbs to net devices, which can't be used by
some drivers as they keep state information in skbs. This patch adds a flag
marking drivers as being able to handle shared skbs in their tx path. Drivers
are defaulted to being unable to do so, but calling ether_setup enables this
flag, as 90% of the drivers calling ether_setup touch real hardware and can
handle shared skbs. A subsequent patch will audit drivers to ensure that the
flag is set properly
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Jiri Pirko <jpirko@redhat.com>
CC: Robert Olsson <robert.olsson@its.uu.se>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Alexey Dobriyan <adobriyan@gmail.com>
CC: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/if.h | 2 | ||||
| -rw-r--r-- | net/core/pktgen.c | 8 | ||||
| -rw-r--r-- | net/ethernet/eth.c | 1 |
3 files changed, 8 insertions, 3 deletions
diff --git a/include/linux/if.h b/include/linux/if.h index 3bc63e6a02f..03489ca92de 100644 --- a/include/linux/if.h +++ b/include/linux/if.h @@ -76,6 +76,8 @@ #define IFF_BRIDGE_PORT 0x4000 /* device used as bridge port */ #define IFF_OVS_DATAPATH 0x8000 /* device used as Open vSwitch * datapath port */ +#define IFF_TX_SKB_SHARING 0x10000 /* The interface supports sharing + * skbs on transmit */ #define IF_GET_IFACE 0x0001 /* for querying only */ #define IF_GET_PROTO 0x0002 diff --git a/net/core/pktgen.c b/net/core/pktgen.c index f76079cd750..e35a6fbb811 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -1070,7 +1070,9 @@ static ssize_t pktgen_if_write(struct file *file, len = num_arg(&user_buffer[i], 10, &value); if (len < 0) return len; - + if ((value > 0) && + (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))) + return -ENOTSUPP; i += len; pkt_dev->clone_skb = value; @@ -3555,7 +3557,6 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) pkt_dev->min_pkt_size = ETH_ZLEN; pkt_dev->max_pkt_size = ETH_ZLEN; pkt_dev->nfrags = 0; - pkt_dev->clone_skb = pg_clone_skb_d; pkt_dev->delay = pg_delay_d; pkt_dev->count = pg_count_d; pkt_dev->sofar = 0; @@ -3563,7 +3564,6 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) pkt_dev->udp_src_max = 9; pkt_dev->udp_dst_min = 9; pkt_dev->udp_dst_max = 9; - pkt_dev->vlan_p = 0; pkt_dev->vlan_cfi = 0; pkt_dev->vlan_id = 0xffff; @@ -3575,6 +3575,8 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) err = pktgen_setup_dev(pkt_dev, ifname); if (err) goto out1; + if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING) + pkt_dev->clone_skb = pg_clone_skb_d; pkt_dev->entry = proc_create_data(ifname, 0600, pg_proc_dir, &pktgen_if_fops, pkt_dev); diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index b8453bd4b09..27997d35ebd 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -340,6 +340,7 @@ void ether_setup(struct net_device *dev) dev->addr_len = ETH_ALEN; dev->tx_queue_len = 1000; /* Ethernet wants good queues */ dev->flags = IFF_BROADCAST|IFF_MULTICAST; + dev->priv_flags = IFF_TX_SKB_SHARING; memset(dev->broadcast, 0xFF, ETH_ALEN); |