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i40e: add support for XDP_REDIRECT

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The driver now acts upon the XDP_REDIRECT return action. Two new ndos
are implemented, ndo_xdp_xmit and ndo_xdp_flush.

XDP_REDIRECT action enables XDP program to redirect frames to other
netdevs.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Björn Töpel 2018-03-22 16:14:34 +01:00 committed by Jeff Kirsher
parent 8ce29c679a
commit d9314c474d
3 changed files with 68 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -11815,6 +11815,8 @@ static const struct net_device_ops i40e_netdev_ops = {
.ndo_bridge_getlink = i40e_ndo_bridge_getlink,
.ndo_bridge_setlink = i40e_ndo_bridge_setlink,
.ndo_bpf = i40e_xdp,
.ndo_xdp_xmit = i40e_xdp_xmit,
.ndo_xdp_flush = i40e_xdp_flush,
};
/**

74
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -2214,7 +2214,7 @@ static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
struct xdp_buff *xdp)
{
int result = I40E_XDP_PASS;
int err, result = I40E_XDP_PASS;
struct i40e_ring *xdp_ring;
struct bpf_prog *xdp_prog;
u32 act;
@ -2233,6 +2233,10 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
result = i40e_xmit_xdp_ring(xdp, xdp_ring);
break;
case XDP_REDIRECT:
err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
result = !err ? I40E_XDP_TX : I40E_XDP_CONSUMED;
break;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
@ -2268,6 +2272,15 @@ static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring,
#endif
}
static inline void i40e_xdp_ring_update_tail(struct i40e_ring *xdp_ring)
{
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch.
*/
wmb();
writel_relaxed(xdp_ring->next_to_use, xdp_ring->tail);
}
/**
* i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
* @rx_ring: rx descriptor ring to transact packets on
@ -2402,16 +2415,11 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
}
if (xdp_xmit) {
struct i40e_ring *xdp_ring;
struct i40e_ring *xdp_ring =
rx_ring->vsi->xdp_rings[rx_ring->queue_index];
xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch.
*/
wmb();
writel(xdp_ring->next_to_use, xdp_ring->tail);
i40e_xdp_ring_update_tail(xdp_ring);
xdp_do_flush_map();
}
rx_ring->skb = skb;
@ -3659,3 +3667,49 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
return i40e_xmit_frame_ring(skb, tx_ring);
}
/**
* i40e_xdp_xmit - Implements ndo_xdp_xmit
* @dev: netdev
* @xdp: XDP buffer
*
* Returns Zero if sent, else an error code
**/
int i40e_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp)
{
struct i40e_netdev_priv *np = netdev_priv(dev);
unsigned int queue_index = smp_processor_id();
struct i40e_vsi *vsi = np->vsi;
int err;
if (test_bit(__I40E_VSI_DOWN, vsi->state))
return -ENETDOWN;
if (!i40e_enabled_xdp_vsi(vsi) || queue_index >= vsi->num_queue_pairs)
return -ENXIO;
err = i40e_xmit_xdp_ring(xdp, vsi->xdp_rings[queue_index]);
if (err != I40E_XDP_TX)
return -ENOSPC;
return 0;
}
/**
* i40e_xdp_flush - Implements ndo_xdp_flush
* @dev: netdev
**/
void i40e_xdp_flush(struct net_device *dev)
{
struct i40e_netdev_priv *np = netdev_priv(dev);
unsigned int queue_index = smp_processor_id();
struct i40e_vsi *vsi = np->vsi;
if (test_bit(__I40E_VSI_DOWN, vsi->state))
return;
if (!i40e_enabled_xdp_vsi(vsi) || queue_index >= vsi->num_queue_pairs)
return;
i40e_xdp_ring_update_tail(vsi->xdp_rings[queue_index]);
}

2
drivers/net/ethernet/intel/i40e/i40e_txrx.h
View File

@ -510,6 +510,8 @@ u32 i40e_get_tx_pending(struct i40e_ring *ring, bool in_sw);
void i40e_detect_recover_hung(struct i40e_vsi *vsi);
int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size);
bool __i40e_chk_linearize(struct sk_buff *skb);
int i40e_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp);
void i40e_xdp_flush(struct net_device *dev);
/**
* i40e_get_head - Retrieve head from head writeback