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Merge branch 'bpf-xsk-fixes'

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Maciej Fijalkowski says:

====================
Cameron reported [0] that on fresh bpf-next he could not run multiple
xdpsock instances in Tx-only mode on single network interface with i40e
driver.

Turns out that Maxim's series [1] which was adding RCU protection around
ndo_xsk_wakeup added check against the __I40E_CONFIG_BUSY being set on
pf->state within i40e_xsk_wakeup() - if it's set, return -ENETDOWN.
Since this bit is set per PF when UMEM is being enabled/disabled, the
situation Cameron stumbled upon was that when he launched second xdpsock
instance, second UMEM was being registered, hence set __I40E_CONFIG_BUSY
which is now observed by first xdpsock and therefore xdpsock's kick_tx()
gets -ENETDOWN as errno.

-ENETDOWN currently is not allowed in kick_tx(), so we were exiting the
first application. Such exit means also XDP program being unloaded and
its dedicated resources, which caused an -ENXIO being return in the
second xdpsock instance.

Let's fix the issue from both sides - protect ourselves from future
xdpsock crashes by allowing for -ENETDOWN errno being set in kick_tx()
(patch 3) and from driver side, return -EAGAIN for the case where PF is
busy (patch 1).

Remove also doubled variable from xdpsock_user.c (patch 2).

Note that ixgbe seems not to be affected since UMEM registration sets
the busy/disable bit per ring, not per PF.

[0]: https://www.spinics.net/lists/xdp-newbies/msg01558.html
[1]: https://lore.kernel.org/netdev/20191217162023.16011-1-maximmi@mellanox.com/
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Daniel Borkmann 2020-02-05 22:06:09 +01:00
commit b9e4272488
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/intel/i40e/i40e_xsk.c
View File

@ -791,7 +791,7 @@ int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
struct i40e_ring *ring;
if (test_bit(__I40E_CONFIG_BUSY, pf->state))
return -ENETDOWN;
return -EAGAIN;
if (test_bit(__I40E_VSI_DOWN, vsi->state))
return -ENETDOWN;

4
samples/bpf/xdpsock_user.c
View File

@ -83,7 +83,6 @@ static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
static u32 opt_umem_flags;
static int opt_unaligned_chunks;
static int opt_mmap_flags;
static u32 opt_xdp_bind_flags;
static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
static int opt_timeout = 1000;
static bool opt_need_wakeup = true;
@ -789,7 +788,8 @@ static void kick_tx(struct xsk_socket_info *xsk)
int ret;
ret = sendto(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, 0);
if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN || errno == EBUSY)
if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN ||
errno == EBUSY || errno == ENETDOWN)
return;
exit_with_error(errno);
}