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ice: add flag to distinguish reset from .ndo_bpf in XDP rings config 

[ Upstream commit 744d197162c2070a6045a71e2666ed93a57cc65d ]

Commit 6624e780a5 ("ice: split ice_vsi_setup into smaller functions")
has placed ice_vsi_free_q_vectors() after ice_destroy_xdp_rings() in
the rebuild process. The behaviour of the XDP rings config functions is
context-dependent, so the change of order has led to
ice_destroy_xdp_rings() doing additional work and removing XDP prog, when
it was supposed to be preserved.

Also, dependency on the PF state reset flags creates an additional,
fortunately less common problem:

* PFR is requested e.g. by tx_timeout handler
* .ndo_bpf() is asked to delete the program, calls ice_destroy_xdp_rings(),
  but reset flag is set, so rings are destroyed without deleting the
  program
* ice_vsi_rebuild tries to delete non-existent XDP rings, because the
  program is still on the VSI
* system crashes

With a similar race, when requested to attach a program,
ice_prepare_xdp_rings() can actually skip setting the program in the VSI
and nevertheless report success.

Instead of reverting to the old order of function calls, add an enum
argument to both ice_prepare_xdp_rings() and ice_destroy_xdp_rings() in
order to distinguish between calls from rebuild and .ndo_bpf().

Fixes: efc2214b60 ("ice: Add support for XDP")
Reviewed-by: Igor Bagnucki <igor.bagnucki@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20240603-net-2024-05-30-intel-net-fixes-v2-4-e3563aa89b0c@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Larysa Zaremba 2024-06-03 14:42:33 -07:00 committed by Greg Kroah-Hartman
parent eab834acb4
commit 649b63f5da
3 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/net/ethernet/intel/ice/ice.h
View File

@ -892,9 +892,16 @@ int ice_down(struct ice_vsi *vsi);
int ice_down_up(struct ice_vsi *vsi);
int ice_vsi_cfg_lan(struct ice_vsi *vsi);
struct ice_vsi *ice_lb_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi);
enum ice_xdp_cfg {
ICE_XDP_CFG_FULL, /* Fully apply new config in .ndo_bpf() */
ICE_XDP_CFG_PART, /* Save/use part of config in VSI rebuild */
};
int ice_vsi_determine_xdp_res(struct ice_vsi *vsi);
int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog);
int ice_destroy_xdp_rings(struct ice_vsi *vsi);
int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog,
enum ice_xdp_cfg cfg_type);
int ice_destroy_xdp_rings(struct ice_vsi *vsi, enum ice_xdp_cfg cfg_type);
int
ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
u32 flags);

5
drivers/net/ethernet/intel/ice/ice_lib.c
View File

@ -2462,7 +2462,8 @@ ice_vsi_cfg_def(struct ice_vsi *vsi, struct ice_vsi_cfg_params *params)
ret = ice_vsi_determine_xdp_res(vsi);
if (ret)
goto unroll_vector_base;
ret = ice_prepare_xdp_rings(vsi, vsi->xdp_prog);
ret = ice_prepare_xdp_rings(vsi, vsi->xdp_prog,
ICE_XDP_CFG_PART);
if (ret)
goto unroll_vector_base;
}
@ -2613,7 +2614,7 @@ void ice_vsi_decfg(struct ice_vsi *vsi)
/* return value check can be skipped here, it always returns
* 0 if reset is in progress
*/
ice_destroy_xdp_rings(vsi);
ice_destroy_xdp_rings(vsi, ICE_XDP_CFG_PART);
ice_vsi_clear_rings(vsi);
ice_vsi_free_q_vectors(vsi);

22
drivers/net/ethernet/intel/ice/ice_main.c
View File

@ -2657,10 +2657,12 @@ static void ice_vsi_assign_bpf_prog(struct ice_vsi *vsi, struct bpf_prog *prog)
* ice_prepare_xdp_rings - Allocate, configure and setup Tx rings for XDP
* @vsi: VSI to bring up Tx rings used by XDP
* @prog: bpf program that will be assigned to VSI
* @cfg_type: create from scratch or restore the existing configuration
*
* Return 0 on success and negative value on error
*/
int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog)
int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog,
enum ice_xdp_cfg cfg_type)
{
u16 max_txqs[ICE_MAX_TRAFFIC_CLASS] = { 0 };
int xdp_rings_rem = vsi->num_xdp_txq;
@ -2736,7 +2738,7 @@ int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog)
* taken into account at the end of ice_vsi_rebuild, where
* ice_cfg_vsi_lan is being called
*/
if (ice_is_reset_in_progress(pf->state))
if (cfg_type == ICE_XDP_CFG_PART)
return 0;
/* tell the Tx scheduler that right now we have
@ -2788,22 +2790,21 @@ err_map_xdp:
/**
* ice_destroy_xdp_rings - undo the configuration made by ice_prepare_xdp_rings
* @vsi: VSI to remove XDP rings
* @cfg_type: disable XDP permanently or allow it to be restored later
*
* Detach XDP rings from irq vectors, clean up the PF bitmap and free
* resources
*/
int ice_destroy_xdp_rings(struct ice_vsi *vsi)
int ice_destroy_xdp_rings(struct ice_vsi *vsi, enum ice_xdp_cfg cfg_type)
{
u16 max_txqs[ICE_MAX_TRAFFIC_CLASS] = { 0 };
struct ice_pf *pf = vsi->back;
int i, v_idx;
/* q_vectors are freed in reset path so there's no point in detaching
* rings; in case of rebuild being triggered not from reset bits
* in pf->state won't be set, so additionally check first q_vector
* against NULL
* rings
*/
if (ice_is_reset_in_progress(pf->state) || !vsi->q_vectors[0])
if (cfg_type == ICE_XDP_CFG_PART)
goto free_qmap;
ice_for_each_q_vector(vsi, v_idx) {
@ -2844,7 +2845,7 @@ free_qmap:
if (static_key_enabled(&ice_xdp_locking_key))
static_branch_dec(&ice_xdp_locking_key);
if (ice_is_reset_in_progress(pf->state) || !vsi->q_vectors[0])
if (cfg_type == ICE_XDP_CFG_PART)
return 0;
ice_vsi_assign_bpf_prog(vsi, NULL);
@ -2955,7 +2956,8 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog,
if (xdp_ring_err) {
NL_SET_ERR_MSG_MOD(extack, "Not enough Tx resources for XDP");
} else {
xdp_ring_err = ice_prepare_xdp_rings(vsi, prog);
xdp_ring_err = ice_prepare_xdp_rings(vsi, prog,
ICE_XDP_CFG_FULL);
if (xdp_ring_err)
NL_SET_ERR_MSG_MOD(extack, "Setting up XDP Tx resources failed");
}
@ -2966,7 +2968,7 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog,
NL_SET_ERR_MSG_MOD(extack, "Setting up XDP Rx resources failed");
} else if (ice_is_xdp_ena_vsi(vsi) && !prog) {
xdp_features_clear_redirect_target(vsi->netdev);
xdp_ring_err = ice_destroy_xdp_rings(vsi);
xdp_ring_err = ice_destroy_xdp_rings(vsi, ICE_XDP_CFG_FULL);
if (xdp_ring_err)
NL_SET_ERR_MSG_MOD(extack, "Freeing XDP Tx resources failed");
/* reallocate Rx queues that were used for zero-copy */