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ionic: use dev_consume_skb_any outside of napi
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If we're not in a NAPI softirq context, we need to be careful
about how we call napi_consume_skb(), specifically we need to
call it with budget==0 to signal to it that we're not in a
safe context.

This was found while running some configuration stress testing
of traffic and a change queue config loop running, and this
curious note popped out:

[ 4371.402645] BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/20545
[ 4371.402897] caller is napi_skb_cache_put+0x16/0x80
[ 4371.403120] CPU: 25 PID: 20545 Comm: ethtool Kdump: loaded Tainted: G           OE      6.10.0-rc3-netnext+ #8
[ 4371.403302] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 01/23/2021
[ 4371.403460] Call Trace:
[ 4371.403613]  <TASK>
[ 4371.403758]  dump_stack_lvl+0x4f/0x70
[ 4371.403904]  check_preemption_disabled+0xc1/0xe0
[ 4371.404051]  napi_skb_cache_put+0x16/0x80
[ 4371.404199]  ionic_tx_clean+0x18a/0x240 [ionic]
[ 4371.404354]  ionic_tx_cq_service+0xc4/0x200 [ionic]
[ 4371.404505]  ionic_tx_flush+0x15/0x70 [ionic]
[ 4371.404653]  ? ionic_lif_qcq_deinit.isra.23+0x5b/0x70 [ionic]
[ 4371.404805]  ionic_txrx_deinit+0x71/0x190 [ionic]
[ 4371.404956]  ionic_reconfigure_queues+0x5f5/0xff0 [ionic]
[ 4371.405111]  ionic_set_ringparam+0x2e8/0x3e0 [ionic]
[ 4371.405265]  ethnl_set_rings+0x1f1/0x300
[ 4371.405418]  ethnl_default_set_doit+0xbb/0x160
[ 4371.405571]  genl_family_rcv_msg_doit+0xff/0x130
	[...]

I found that ionic_tx_clean() calls napi_consume_skb() which calls
napi_skb_cache_put(), but before that last call is the note
    /* Zero budget indicate non-NAPI context called us, like netpoll */
and
    DEBUG_NET_WARN_ON_ONCE(!in_softirq());

Those are pretty big hints that we're doing it wrong.  We can pass a
context hint down through the calls to let ionic_tx_clean() know what
we're doing so it can call napi_consume_skb() correctly.

Fixes: 386e698 ("ionic: Make use napi_consume_skb")
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://patch.msgid.link/20240624175015.4520-1-shannon.nelson@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@emusln @kuba-moo
emusln authored and kuba-moo committed Jun 25, 2024
1 parent b1c4b4d commit 84b767f
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Showing 3 changed files with 21 additions and 13 deletions.
4 changes: 3 additions & 1 deletion drivers/net/ethernet/pensando/ionic/ionic_dev.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -375,7 +375,9 @@ typedef void (*ionic_cq_done_cb)(void *done_arg);
unsigned int ionic_cq_service(struct ionic_cq *cq, unsigned int work_to_do,
ionic_cq_cb cb, ionic_cq_done_cb done_cb,
void *done_arg);
unsigned int ionic_tx_cq_service(struct ionic_cq *cq, unsigned int work_to_do);
unsigned int ionic_tx_cq_service(struct ionic_cq *cq,
unsigned int work_to_do,
bool in_napi);

int ionic_q_init(struct ionic_lif *lif, struct ionic_dev *idev,
struct ionic_queue *q, unsigned int index, const char *name,
Expand Down
2 changes: 1 addition & 1 deletion drivers/net/ethernet/pensando/ionic/ionic_lif.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1189,7 +1189,7 @@ static int ionic_adminq_napi(struct napi_struct *napi, int budget)
ionic_rx_service, NULL, NULL);

if (lif->hwstamp_txq)
tx_work = ionic_tx_cq_service(&lif->hwstamp_txq->cq, budget);
tx_work = ionic_tx_cq_service(&lif->hwstamp_txq->cq, budget, !!budget);

work_done = max(max(n_work, a_work), max(rx_work, tx_work));
if (work_done < budget && napi_complete_done(napi, work_done)) {
Expand Down
28 changes: 17 additions & 11 deletions drivers/net/ethernet/pensando/ionic/ionic_txrx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,8 @@ static void ionic_tx_desc_unmap_bufs(struct ionic_queue *q,

static void ionic_tx_clean(struct ionic_queue *q,
struct ionic_tx_desc_info *desc_info,
struct ionic_txq_comp *comp);
struct ionic_txq_comp *comp,
bool in_napi);

static inline void ionic_txq_post(struct ionic_queue *q, bool ring_dbell)
{
Expand Down Expand Up @@ -944,7 +945,7 @@ int ionic_tx_napi(struct napi_struct *napi, int budget)
u32 work_done = 0;
u32 flags = 0;

work_done = ionic_tx_cq_service(cq, budget);
work_done = ionic_tx_cq_service(cq, budget, !!budget);

if (unlikely(!budget))
return budget;
Expand Down Expand Up @@ -1028,7 +1029,7 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
txqcq = lif->txqcqs[qi];
txcq = &lif->txqcqs[qi]->cq;

tx_work_done = ionic_tx_cq_service(txcq, IONIC_TX_BUDGET_DEFAULT);
tx_work_done = ionic_tx_cq_service(txcq, IONIC_TX_BUDGET_DEFAULT, !!budget);

if (unlikely(!budget))
return budget;
Expand Down Expand Up @@ -1161,7 +1162,8 @@ static void ionic_tx_desc_unmap_bufs(struct ionic_queue *q,

static void ionic_tx_clean(struct ionic_queue *q,
struct ionic_tx_desc_info *desc_info,
struct ionic_txq_comp *comp)
struct ionic_txq_comp *comp,
bool in_napi)
{
struct ionic_tx_stats *stats = q_to_tx_stats(q);
struct ionic_qcq *qcq = q_to_qcq(q);
Expand Down Expand Up @@ -1213,11 +1215,13 @@ static void ionic_tx_clean(struct ionic_queue *q,
desc_info->bytes = skb->len;
stats->clean++;

napi_consume_skb(skb, 1);
napi_consume_skb(skb, likely(in_napi) ? 1 : 0);
}

static bool ionic_tx_service(struct ionic_cq *cq,
unsigned int *total_pkts, unsigned int *total_bytes)
unsigned int *total_pkts,
unsigned int *total_bytes,
bool in_napi)
{
struct ionic_tx_desc_info *desc_info;
struct ionic_queue *q = cq->bound_q;
Expand All @@ -1239,7 +1243,7 @@ static bool ionic_tx_service(struct ionic_cq *cq,
desc_info->bytes = 0;
index = q->tail_idx;
q->tail_idx = (q->tail_idx + 1) & (q->num_descs - 1);
ionic_tx_clean(q, desc_info, comp);
ionic_tx_clean(q, desc_info, comp, in_napi);
if (desc_info->skb) {
pkts++;
bytes += desc_info->bytes;
Expand All @@ -1253,7 +1257,9 @@ static bool ionic_tx_service(struct ionic_cq *cq,
return true;
}

unsigned int ionic_tx_cq_service(struct ionic_cq *cq, unsigned int work_to_do)
unsigned int ionic_tx_cq_service(struct ionic_cq *cq,
unsigned int work_to_do,
bool in_napi)
{
unsigned int work_done = 0;
unsigned int bytes = 0;
Expand All @@ -1262,7 +1268,7 @@ unsigned int ionic_tx_cq_service(struct ionic_cq *cq, unsigned int work_to_do)
if (work_to_do == 0)
return 0;

while (ionic_tx_service(cq, &pkts, &bytes)) {
while (ionic_tx_service(cq, &pkts, &bytes, in_napi)) {
if (cq->tail_idx == cq->num_descs - 1)
cq->done_color = !cq->done_color;
cq->tail_idx = (cq->tail_idx + 1) & (cq->num_descs - 1);
Expand All @@ -1288,7 +1294,7 @@ void ionic_tx_flush(struct ionic_cq *cq)
{
u32 work_done;

work_done = ionic_tx_cq_service(cq, cq->num_descs);
work_done = ionic_tx_cq_service(cq, cq->num_descs, false);
if (work_done)
ionic_intr_credits(cq->idev->intr_ctrl, cq->bound_intr->index,
work_done, IONIC_INTR_CRED_RESET_COALESCE);
Expand All @@ -1305,7 +1311,7 @@ void ionic_tx_empty(struct ionic_queue *q)
desc_info = &q->tx_info[q->tail_idx];
desc_info->bytes = 0;
q->tail_idx = (q->tail_idx + 1) & (q->num_descs - 1);
ionic_tx_clean(q, desc_info, NULL);
ionic_tx_clean(q, desc_info, NULL, false);
if (desc_info->skb) {
pkts++;
bytes += desc_info->bytes;
Expand Down

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