5.15-stable review patch. If anyone has any objections, please let me know.
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From: Souradeep Chakrabarti schakrabarti@linux.microsoft.com
[ Upstream commit b6ecc662037694488bfff7c9fd21c405df8411f2 ]
Currently napi_disable() gets called during rxq and txq cleanup, even before napi is enabled and hrtimer is initialized. It causes kernel panic.
? page_fault_oops+0x136/0x2b0 ? page_counter_cancel+0x2e/0x80 ? do_user_addr_fault+0x2f2/0x640 ? refill_obj_stock+0xc4/0x110 ? exc_page_fault+0x71/0x160 ? asm_exc_page_fault+0x27/0x30 ? __mmdrop+0x10/0x180 ? __mmdrop+0xec/0x180 ? hrtimer_active+0xd/0x50 hrtimer_try_to_cancel+0x2c/0xf0 hrtimer_cancel+0x15/0x30 napi_disable+0x65/0x90 mana_destroy_rxq+0x4c/0x2f0 mana_create_rxq.isra.0+0x56c/0x6d0 ? mana_uncfg_vport+0x50/0x50 mana_alloc_queues+0x21b/0x320 ? skb_dequeue+0x5f/0x80
Cc: stable@vger.kernel.org Fixes: e1b5683ff62e ("net: mana: Move NAPI from EQ to CQ") Signed-off-by: Souradeep Chakrabarti schakrabarti@linux.microsoft.com Reviewed-by: Haiyang Zhang haiyangz@microsoft.com Reviewed-by: Shradha Gupta shradhagupta@linux.microsoft.com Signed-off-by: David S. Miller davem@davemloft.net (cherry picked from commit b6ecc662037694488bfff7c9fd21c405df8411f2) [Harshit: conflicts resolved due to missing commit: ed5356b53f07 ("net: mana: Add XDP support") and commit: d356abb95b98 ("net: mana: Add counter for XDP_TX") in 5.15.y] Signed-off-by: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/microsoft/mana/mana.h | 2 ++ drivers/net/ethernet/microsoft/mana/mana_en.c | 21 +++++++++++++-------- 2 files changed, 15 insertions(+), 8 deletions(-)
--- a/drivers/net/ethernet/microsoft/mana/mana.h +++ b/drivers/net/ethernet/microsoft/mana/mana.h @@ -76,6 +76,8 @@ struct mana_txq {
atomic_t pending_sends;
+ bool napi_initialized; + struct mana_stats stats; };
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1154,10 +1154,12 @@ static void mana_destroy_txq(struct mana
for (i = 0; i < apc->num_queues; i++) { napi = &apc->tx_qp[i].tx_cq.napi; - napi_synchronize(napi); - napi_disable(napi); - netif_napi_del(napi); - + if (apc->tx_qp[i].txq.napi_initialized) { + napi_synchronize(napi); + napi_disable(napi); + netif_napi_del(napi); + apc->tx_qp[i].txq.napi_initialized = false; + } mana_destroy_wq_obj(apc, GDMA_SQ, apc->tx_qp[i].tx_object);
mana_deinit_cq(apc, &apc->tx_qp[i].tx_cq); @@ -1213,6 +1215,7 @@ static int mana_create_txq(struct mana_p txq->ndev = net; txq->net_txq = netdev_get_tx_queue(net, i); txq->vp_offset = apc->tx_vp_offset; + txq->napi_initialized = false; skb_queue_head_init(&txq->pending_skbs);
memset(&spec, 0, sizeof(spec)); @@ -1277,6 +1280,7 @@ static int mana_create_txq(struct mana_p
netif_tx_napi_add(net, &cq->napi, mana_poll, NAPI_POLL_WEIGHT); napi_enable(&cq->napi); + txq->napi_initialized = true;
mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT); } @@ -1288,7 +1292,7 @@ out: }
static void mana_destroy_rxq(struct mana_port_context *apc, - struct mana_rxq *rxq, bool validate_state) + struct mana_rxq *rxq, bool napi_initialized)
{ struct gdma_context *gc = apc->ac->gdma_dev->gdma_context; @@ -1302,12 +1306,13 @@ static void mana_destroy_rxq(struct mana
napi = &rxq->rx_cq.napi;
- if (validate_state) + if (napi_initialized) { napi_synchronize(napi);
- napi_disable(napi); - netif_napi_del(napi); + napi_disable(napi);
+ netif_napi_del(napi); + } mana_destroy_wq_obj(apc, GDMA_RQ, rxq->rxobj);
mana_deinit_cq(apc, &rxq->rx_cq);