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Message-ID:
<CH0PR18MB433918584BACA0667DFC48B0CD42A@CH0PR18MB4339.namprd18.prod.outlook.com>
Date: Fri, 4 Jul 2025 07:14:34 +0000
From: Geethasowjanya Akula <gakula@...vell.com>
To: Jakub Kicinski <kuba@...nel.org>,
"davem@...emloft.net"
<davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"edumazet@...gle.com"
<edumazet@...gle.com>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
"horms@...nel.org"
<horms@...nel.org>,
"andrew@...n.ch" <andrew@...n.ch>,
"przemyslaw.kitszel@...el.com" <przemyslaw.kitszel@...el.com>,
"anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>,
Sunil Kovvuri
Goutham <sgoutham@...vell.com>,
Subbaraya Sundeep Bhatta
<sbhatta@...vell.com>,
Bharat Bhushan <bbhushan2@...vell.com>,
"tariqt@...dia.com" <tariqt@...dia.com>,
"mbloch@...dia.com"
<mbloch@...dia.com>,
"leon@...nel.org" <leon@...nel.org>,
"gal@...dia.com"
<gal@...dia.com>,
"ecree.xilinx@...il.com" <ecree.xilinx@...il.com>
Subject: RE: [EXTERNAL] [PATCH net-next v2 1/5] eth: otx2: migrate to the
*_rxfh_context ops
>-----Original Message-----
>From: Jakub Kicinski <kuba@...nel.org>
>Sent: Wednesday, July 2, 2025 8:36 AM
>To: davem@...emloft.net
>Cc: netdev@...r.kernel.org; edumazet@...gle.com; pabeni@...hat.com;
>andrew+netdev@...n.ch; horms@...nel.org; andrew@...n.ch;
>przemyslaw.kitszel@...el.com; anthony.l.nguyen@...el.com; Sunil Kovvuri
>Goutham <sgoutham@...vell.com>; Geethasowjanya Akula
><gakula@...vell.com>; Subbaraya Sundeep Bhatta <sbhatta@...vell.com>;
>Bharat Bhushan <bbhushan2@...vell.com>; tariqt@...dia.com;
>mbloch@...dia.com; leon@...nel.org; gal@...dia.com;
>ecree.xilinx@...il.com; Jakub Kicinski <kuba@...nel.org>
>Subject: [EXTERNAL] [PATCH net-next v2 1/5] eth: otx2: migrate to the
>*_rxfh_context ops
>
>otx2 only supports additional indirection tables (no separate keys
>etc.) so the conversion to dedicated callbacks and core-allocated context is
>mostly removing the code which stores the extra tables in the driver. Core
>already stores the indirection tables for additional contexts, and doesn't call
>.get for them.
>
>One subtle change here is that we'll now start with the table covering all
>queues, not directing all traffic to queue 0.
>This is what core expects if the user doesn't pass the initial indir table explicitly
>(there's a WARN_ON() in the core trying to make sure driver authors don't
>forget to populate ctx to defaults).
>
>Drivers implementing .create_rxfh_context don't have to set
>cap_rss_ctx_supported, so remove it.
>
>Signed-off-by: Jakub Kicinski <kuba@...nel.org>
>---
> .../marvell/octeontx2/nic/otx2_common.h | 8 +-
> .../marvell/octeontx2/nic/otx2_common.c | 27 ++--
> .../marvell/octeontx2/nic/otx2_ethtool.c | 137 ++++++++++--------
> .../ethernet/marvell/octeontx2/nic/otx2_pf.c | 6 +-
> .../ethernet/marvell/octeontx2/nic/otx2_xsk.c | 4 +-
> 5 files changed, 90 insertions(+), 92 deletions(-)
>
>diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
>b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
>index 6b59881f78e0..e3765b73c434 100644
>--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
>+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
>@@ -93,10 +93,6 @@ struct otx2_lmt_info {
> u64 lmt_addr;
> u16 lmt_id;
> };
>-/* RSS configuration */
>-struct otx2_rss_ctx {
>- u8 ind_tbl[MAX_RSS_INDIR_TBL_SIZE];
>-};
>
> struct otx2_rss_info {
> u8 enable;
>@@ -104,7 +100,7 @@ struct otx2_rss_info {
> u16 rss_size;
> #define RSS_HASH_KEY_SIZE 44 /* 352 bit key */
> u8 key[RSS_HASH_KEY_SIZE];
>- struct otx2_rss_ctx *rss_ctx[MAX_RSS_GROUPS];
>+ u32 ind_tbl[MAX_RSS_INDIR_TBL_SIZE];
> };
>
> /* NIX (or NPC) RX errors */
>@@ -1067,7 +1063,7 @@ int otx2_set_hw_capabilities(struct otx2_nic *pfvf);
>int otx2_rss_init(struct otx2_nic *pfvf); int otx2_set_flowkey_cfg(struct
>otx2_nic *pfvf); void otx2_set_rss_key(struct otx2_nic *pfvf); -int
>otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id);
>+int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id, const u32
>+*ind_tbl);
>
> /* Mbox handlers */
> void mbox_handler_msix_offset(struct otx2_nic *pfvf, diff --git
>a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
>b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
>index 9a10396e7504..f674729124e6 100644
>--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
>+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
>@@ -318,21 +318,20 @@ int otx2_set_flowkey_cfg(struct otx2_nic *pfvf)
> return err;
> }
>
>-int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id)
>+int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id, const u32
>+*ind_tbl)
> {
> struct otx2_rss_info *rss = &pfvf->hw.rss_info;
> const int index = rss->rss_size * ctx_id;
> struct mbox *mbox = &pfvf->mbox;
>- struct otx2_rss_ctx *rss_ctx;
> struct nix_aq_enq_req *aq;
> int idx, err;
>
> mutex_lock(&mbox->lock);
>- rss_ctx = rss->rss_ctx[ctx_id];
>+ ind_tbl = ind_tbl ?: rss->ind_tbl;
> /* Get memory to put this msg */
> for (idx = 0; idx < rss->rss_size; idx++) {
> /* Ignore the queue if AF_XDP zero copy is enabled */
>- if (test_bit(rss_ctx->ind_tbl[idx], pfvf->af_xdp_zc_qidx))
>+ if (test_bit(ind_tbl[idx], pfvf->af_xdp_zc_qidx))
> continue;
>
> aq = otx2_mbox_alloc_msg_nix_aq_enq(mbox);
>@@ -352,7 +351,7 @@ int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id)
> }
> }
>
>- aq->rss.rq = rss_ctx->ind_tbl[idx];
>+ aq->rss.rq = ind_tbl[idx];
>
> /* Fill AQ info */
> aq->qidx = index + idx;
>@@ -390,30 +389,22 @@ void otx2_set_rss_key(struct otx2_nic *pfvf) int
>otx2_rss_init(struct otx2_nic *pfvf) {
> struct otx2_rss_info *rss = &pfvf->hw.rss_info;
>- struct otx2_rss_ctx *rss_ctx;
> int idx, ret = 0;
>
>- rss->rss_size = sizeof(*rss->rss_ctx[DEFAULT_RSS_CONTEXT_GROUP]);
>+ rss->rss_size = sizeof(*rss->ind_tbl);
>
> /* Init RSS key if it is not setup already */
> if (!rss->enable)
> netdev_rss_key_fill(rss->key, sizeof(rss->key));
> otx2_set_rss_key(pfvf);
>
>- if (!netif_is_rxfh_configured(pfvf->netdev)) {
>- /* Set RSS group 0 as default indirection table */
>- rss->rss_ctx[DEFAULT_RSS_CONTEXT_GROUP] = kzalloc(rss-
>>rss_size,
>- GFP_KERNEL);
>- if (!rss->rss_ctx[DEFAULT_RSS_CONTEXT_GROUP])
>- return -ENOMEM;
>-
>- rss_ctx = rss->rss_ctx[DEFAULT_RSS_CONTEXT_GROUP];
>+ if (!netif_is_rxfh_configured(pfvf->netdev))
> for (idx = 0; idx < rss->rss_size; idx++)
>- rss_ctx->ind_tbl[idx] =
>+ rss->ind_tbl[idx] =
> ethtool_rxfh_indir_default(idx,
> pfvf->hw.rx_queues);
>- }
>- ret = otx2_set_rss_table(pfvf, DEFAULT_RSS_CONTEXT_GROUP);
>+
>+ ret = otx2_set_rss_table(pfvf, DEFAULT_RSS_CONTEXT_GROUP, NULL);
> if (ret)
> return ret;
>
>diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
>b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
>index 20de517dfb09..998c734ff839 100644
>--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
>+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
>@@ -796,35 +796,75 @@ static u32 otx2_get_rxfh_indir_size(struct net_device
>*dev)
> return MAX_RSS_INDIR_TBL_SIZE;
> }
>
>-static int otx2_rss_ctx_delete(struct otx2_nic *pfvf, int ctx_id)
>+static int otx2_create_rxfh(struct net_device *dev,
>+ struct ethtool_rxfh_context *ctx,
>+ const struct ethtool_rxfh_param *rxfh,
>+ struct netlink_ext_ack *extack)
> {
>- struct otx2_rss_info *rss = &pfvf->hw.rss_info;
>+ struct otx2_nic *pfvf = netdev_priv(dev);
>+ struct otx2_rss_info *rss;
>+ unsigned int queues;
>+ u32 *ind_tbl;
>+ int idx;
>
>- otx2_rss_ctx_flow_del(pfvf, ctx_id);
>- kfree(rss->rss_ctx[ctx_id]);
>- rss->rss_ctx[ctx_id] = NULL;
>+ rss = &pfvf->hw.rss_info;
>+ queues = pfvf->hw.rx_queues;
>+
>+ if (rxfh->hfunc && rxfh->hfunc != ETH_RSS_HASH_TOP)
>+ return -EOPNOTSUPP;
>+ ctx->hfunc = ETH_RSS_HASH_TOP;
>+
>+ if (!rss->enable) {
>+ netdev_err(dev, "RSS is disabled, cannot change settings\n");
>+ return -EIO;
>+ }
>+
>+ ind_tbl = rxfh->indir;
>+ if (!ind_tbl) {
>+ ind_tbl = ethtool_rxfh_context_indir(ctx);
>+ for (idx = 0; idx < rss->rss_size; idx++)
>+ ind_tbl[idx] = ethtool_rxfh_indir_default(idx, queues);
>+ }
>+
>+ otx2_set_rss_table(pfvf, rxfh->rss_context, ind_tbl);
Not a strong requirement, but it might be worth checking the return value here.
>+ return 0;
>+}
>+
>+static int otx2_modify_rxfh(struct net_device *dev,
>+ struct ethtool_rxfh_context *ctx,
>+ const struct ethtool_rxfh_param *rxfh,
>+ struct netlink_ext_ack *extack)
>+{
>+ struct otx2_nic *pfvf = netdev_priv(dev);
>+
>+ if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
>+ rxfh->hfunc != ETH_RSS_HASH_TOP)
>+ return -EOPNOTSUPP;
>+
>+ if (!pfvf->hw.rss_info.enable) {
>+ netdev_err(dev, "RSS is disabled, cannot change settings\n");
>+ return -EIO;
>+ }
>+
>+ if (rxfh->indir)
>+ otx2_set_rss_table(pfvf, rxfh->rss_context, rxfh->indir);
>
> return 0;
> }
>
>-static int otx2_rss_ctx_create(struct otx2_nic *pfvf,
>- u32 *rss_context)
>+static int otx2_remove_rxfh(struct net_device *dev,
>+ struct ethtool_rxfh_context *ctx,
>+ u32 rss_context,
>+ struct netlink_ext_ack *extack)
> {
>- struct otx2_rss_info *rss = &pfvf->hw.rss_info;
>- u8 ctx;
>+ struct otx2_nic *pfvf = netdev_priv(dev);
>
>- for (ctx = 0; ctx < MAX_RSS_GROUPS; ctx++) {
>- if (!rss->rss_ctx[ctx])
>- break;
>+ if (!pfvf->hw.rss_info.enable) {
>+ netdev_err(dev, "RSS is disabled, cannot change settings\n");
>+ return -EIO;
> }
>- if (ctx == MAX_RSS_GROUPS)
>- return -EINVAL;
>-
>- rss->rss_ctx[ctx] = kzalloc(sizeof(*rss->rss_ctx[ctx]), GFP_KERNEL);
>- if (!rss->rss_ctx[ctx])
>- return -ENOMEM;
>- *rss_context = ctx;
>
>+ otx2_rss_ctx_flow_del(pfvf, rss_context);
> return 0;
> }
>
>@@ -833,23 +873,14 @@ static int otx2_set_rxfh(struct net_device *dev,
> struct ethtool_rxfh_param *rxfh,
> struct netlink_ext_ack *extack)
> {
>- u32 rss_context = DEFAULT_RSS_CONTEXT_GROUP;
> struct otx2_nic *pfvf = netdev_priv(dev);
>- struct otx2_rss_ctx *rss_ctx;
> struct otx2_rss_info *rss;
>- int ret, idx;
>+ int idx;
>
> if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
> rxfh->hfunc != ETH_RSS_HASH_TOP)
> return -EOPNOTSUPP;
>
>- if (rxfh->rss_context)
>- rss_context = rxfh->rss_context;
>-
>- if (rss_context != ETH_RXFH_CONTEXT_ALLOC &&
>- rss_context >= MAX_RSS_GROUPS)
>- return -EINVAL;
>-
> rss = &pfvf->hw.rss_info;
>
> if (!rss->enable) {
>@@ -861,21 +892,12 @@ static int otx2_set_rxfh(struct net_device *dev,
> memcpy(rss->key, rxfh->key, sizeof(rss->key));
> otx2_set_rss_key(pfvf);
> }
>- if (rxfh->rss_delete)
>- return otx2_rss_ctx_delete(pfvf, rss_context);
>
>- if (rss_context == ETH_RXFH_CONTEXT_ALLOC) {
>- ret = otx2_rss_ctx_create(pfvf, &rss_context);
>- rxfh->rss_context = rss_context;
>- if (ret)
>- return ret;
>- }
> if (rxfh->indir) {
>- rss_ctx = rss->rss_ctx[rss_context];
> for (idx = 0; idx < rss->rss_size; idx++)
>- rss_ctx->ind_tbl[idx] = rxfh->indir[idx];
>+ rss->ind_tbl[idx] = rxfh->indir[idx];
> }
>- otx2_set_rss_table(pfvf, rss_context);
>+ otx2_set_rss_table(pfvf, DEFAULT_RSS_CONTEXT_GROUP, NULL);
>
> return 0;
> }
>@@ -884,9 +906,7 @@ static int otx2_set_rxfh(struct net_device *dev, static
>int otx2_get_rxfh(struct net_device *dev,
> struct ethtool_rxfh_param *rxfh)
> {
>- u32 rss_context = DEFAULT_RSS_CONTEXT_GROUP;
> struct otx2_nic *pfvf = netdev_priv(dev);
>- struct otx2_rss_ctx *rss_ctx;
> struct otx2_rss_info *rss;
> u32 *indir = rxfh->indir;
> int idx, rx_queues;
>@@ -894,32 +914,21 @@ static int otx2_get_rxfh(struct net_device *dev,
> rss = &pfvf->hw.rss_info;
>
> rxfh->hfunc = ETH_RSS_HASH_TOP;
>- if (rxfh->rss_context)
>- rss_context = rxfh->rss_context;
>-
> if (!indir)
> return 0;
>
>- if (!rss->enable && rss_context == DEFAULT_RSS_CONTEXT_GROUP) {
>+ if (!rss->enable) {
> rx_queues = pfvf->hw.rx_queues;
> for (idx = 0; idx < MAX_RSS_INDIR_TBL_SIZE; idx++)
> indir[idx] = ethtool_rxfh_indir_default(idx, rx_queues);
> return 0;
> }
>- if (rss_context >= MAX_RSS_GROUPS)
>- return -ENOENT;
>
>- rss_ctx = rss->rss_ctx[rss_context];
>- if (!rss_ctx)
>- return -ENOENT;
>-
>- if (indir) {
>- for (idx = 0; idx < rss->rss_size; idx++) {
>- /* Ignore if the rx queue is AF_XDP zero copy enabled
>*/
>- if (test_bit(rss_ctx->ind_tbl[idx], pfvf-
>>af_xdp_zc_qidx))
>- continue;
>- indir[idx] = rss_ctx->ind_tbl[idx];
>- }
>+ for (idx = 0; idx < rss->rss_size; idx++) {
>+ /* Ignore if the rx queue is AF_XDP zero copy enabled */
>+ if (test_bit(rss->ind_tbl[idx], pfvf->af_xdp_zc_qidx))
>+ continue;
>+ indir[idx] = rss->ind_tbl[idx];
> }
> if (rxfh->key)
> memcpy(rxfh->key, rss->key, sizeof(rss->key)); @@ -1307,12
>+1316,12 @@ static void otx2_get_fec_stats(struct net_device *netdev, }
>
> static const struct ethtool_ops otx2_ethtool_ops = {
>- .cap_rss_ctx_supported = true,
> .supported_coalesce_params = ETHTOOL_COALESCE_USECS |
> ETHTOOL_COALESCE_MAX_FRAMES |
> ETHTOOL_COALESCE_USE_ADAPTIVE,
> .supported_ring_params = ETHTOOL_RING_USE_RX_BUF_LEN |
> ETHTOOL_RING_USE_CQE_SIZE,
>+ .rxfh_max_num_contexts = MAX_RSS_GROUPS,
> .get_link = otx2_get_link,
> .get_drvinfo = otx2_get_drvinfo,
> .get_strings = otx2_get_strings,
>@@ -1332,6 +1341,9 @@ static const struct ethtool_ops otx2_ethtool_ops = {
> .set_rxfh = otx2_set_rxfh,
> .get_rxfh_fields = otx2_get_rss_hash_opts,
> .set_rxfh_fields = otx2_set_rss_hash_opts,
>+ .create_rxfh_context = otx2_create_rxfh,
>+ .modify_rxfh_context = otx2_modify_rxfh,
>+ .remove_rxfh_context = otx2_remove_rxfh,
> .get_msglevel = otx2_get_msglevel,
> .set_msglevel = otx2_set_msglevel,
> .get_pauseparam = otx2_get_pauseparam,
>@@ -1426,12 +1438,12 @@ static int otx2vf_get_link_ksettings(struct
>net_device *netdev, }
>
> static const struct ethtool_ops otx2vf_ethtool_ops = {
>- .cap_rss_ctx_supported = true,
> .supported_coalesce_params = ETHTOOL_COALESCE_USECS |
> ETHTOOL_COALESCE_MAX_FRAMES |
> ETHTOOL_COALESCE_USE_ADAPTIVE,
> .supported_ring_params = ETHTOOL_RING_USE_RX_BUF_LEN |
> ETHTOOL_RING_USE_CQE_SIZE,
>+ .rxfh_max_num_contexts = MAX_RSS_GROUPS,
> .get_link = otx2_get_link,
> .get_drvinfo = otx2vf_get_drvinfo,
> .get_strings = otx2vf_get_strings,
>@@ -1447,6 +1459,9 @@ static const struct ethtool_ops otx2vf_ethtool_ops = {
> .set_rxfh = otx2_set_rxfh,
> .get_rxfh_fields = otx2_get_rss_hash_opts,
> .set_rxfh_fields = otx2_set_rss_hash_opts,
>+ .create_rxfh_context = otx2_create_rxfh,
>+ .modify_rxfh_context = otx2_modify_rxfh,
>+ .remove_rxfh_context = otx2_remove_rxfh,
> .get_ringparam = otx2_get_ringparam,
> .set_ringparam = otx2_set_ringparam,
> .get_coalesce = otx2_get_coalesce,
>diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>index 4e2d1206e1b0..b23585c5e5c2 100644
>--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
>@@ -2158,7 +2158,6 @@ int otx2_stop(struct net_device *netdev)
> struct otx2_nic *pf = netdev_priv(netdev);
> struct otx2_cq_poll *cq_poll = NULL;
> struct otx2_qset *qset = &pf->qset;
>- struct otx2_rss_info *rss;
> int qidx, vec, wrk;
>
> /* If the DOWN flag is set resources are already freed */ @@ -2176,10
>+2175,7 @@ int otx2_stop(struct net_device *netdev)
> otx2_rxtx_enable(pf, false);
>
> /* Clear RSS enable flag */
>- rss = &pf->hw.rss_info;
>- rss->enable = false;
>- if (!netif_is_rxfh_configured(netdev))
>- kfree(rss->rss_ctx[DEFAULT_RSS_CONTEXT_GROUP]);
>+ pf->hw.rss_info.enable = false;
>
> /* Cleanup Queue IRQ */
> vec = pci_irq_vector(pf->pdev,
>diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
>b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
>index b328aae23d73..7d67b4cbaf71 100644
>--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
>+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
>@@ -132,7 +132,7 @@ int otx2_xsk_pool_enable(struct otx2_nic *pf, struct
>xsk_buff_pool *pool, u16 qi
> set_bit(qidx, pf->af_xdp_zc_qidx);
> otx2_clean_up_rq(pf, qidx);
> /* Reconfigure RSS table as 'qidx' cannot be part of RSS now */
>- otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP);
>+ otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP, NULL);
> /* Kick start the NAPI context so that receiving will start */
> return otx2_xsk_wakeup(pf->netdev, qidx, XDP_WAKEUP_RX); } @@ -
>153,7 +153,7 @@ int otx2_xsk_pool_disable(struct otx2_nic *pf, u16 qidx)
> clear_bit(qidx, pf->af_xdp_zc_qidx);
> xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC |
>DMA_ATTR_WEAK_ORDERING);
> /* Reconfigure RSS table as 'qidx' now need to be part of RSS now */
>- otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP);
>+ otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP, NULL);
>
> return 0;
> }
>--
>2.50.0
Tested-by: Geetha sowjanya <gakula@...vell.com>
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