This is a note to let you know that I've just added the patch titled
net: rswitch: Add a setting ext descriptor function
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-rswitch-add-a-setting-ext-descriptor-function.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9cff1ad3476558d3baad92a01ff35c1af191de8a
Author: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Fri Dec 8 13:10:26 2023 +0900
net: rswitch: Add a setting ext descriptor function
[ Upstream commit fcff581ee43078cf23216aa7079012e935a6a078 ]
If the driver would like to transmit a jumbo frame like 2KiB or more,
it should be split into multiple queues. In the near future, to support
this, add a setting ext descriptor function to improve code readability.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 0c9547e6ccf4 ("net: renesas: rswitch: fix race window between tx start and complete")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index b008a44ea6ac..c01b4bd3f812 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -1516,6 +1516,51 @@ static int rswitch_stop(struct net_device *ndev)
return 0;
};
+static bool rswitch_ext_desc_set_info1(struct rswitch_device *rdev,
+ struct sk_buff *skb,
+ struct rswitch_ext_desc *desc)
+{
+ desc->info1 = cpu_to_le64(INFO1_DV(BIT(rdev->etha->index)) |
+ INFO1_IPV(GWCA_IPV_NUM) | INFO1_FMT);
+ if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
+ struct rswitch_gwca_ts_info *ts_info;
+
+ ts_info = kzalloc(sizeof(*ts_info), GFP_ATOMIC);
+ if (!ts_info)
+ return false;
+
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+ rdev->ts_tag++;
+ desc->info1 |= cpu_to_le64(INFO1_TSUN(rdev->ts_tag) | INFO1_TXC);
+
+ ts_info->skb = skb_get(skb);
+ ts_info->port = rdev->port;
+ ts_info->tag = rdev->ts_tag;
+ list_add_tail(&ts_info->list, &rdev->priv->gwca.ts_info_list);
+
+ skb_tx_timestamp(skb);
+ }
+
+ return true;
+}
+
+static bool rswitch_ext_desc_set(struct rswitch_device *rdev,
+ struct sk_buff *skb,
+ struct rswitch_ext_desc *desc,
+ dma_addr_t dma_addr, u16 len, u8 die_dt)
+{
+ rswitch_desc_set_dptr(&desc->desc, dma_addr);
+ desc->desc.info_ds = cpu_to_le16(len);
+ if (!rswitch_ext_desc_set_info1(rdev, skb, desc))
+ return false;
+
+ dma_wmb();
+
+ desc->desc.die_dt = die_dt;
+
+ return true;
+}
+
static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct rswitch_device *rdev = netdev_priv(ndev);
@@ -1539,33 +1584,9 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd
gq->skbs[gq->cur] = skb;
gq->unmap_addrs[gq->cur] = dma_addr;
desc = &gq->tx_ring[gq->cur];
- rswitch_desc_set_dptr(&desc->desc, dma_addr);
- desc->desc.info_ds = cpu_to_le16(skb->len);
-
- desc->info1 = cpu_to_le64(INFO1_DV(BIT(rdev->etha->index)) |
- INFO1_IPV(GWCA_IPV_NUM) | INFO1_FMT);
- if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
- struct rswitch_gwca_ts_info *ts_info;
-
- ts_info = kzalloc(sizeof(*ts_info), GFP_ATOMIC);
- if (!ts_info)
- goto err_unmap;
-
- skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
- rdev->ts_tag++;
- desc->info1 |= cpu_to_le64(INFO1_TSUN(rdev->ts_tag) | INFO1_TXC);
-
- ts_info->skb = skb_get(skb);
- ts_info->port = rdev->port;
- ts_info->tag = rdev->ts_tag;
- list_add_tail(&ts_info->list, &rdev->priv->gwca.ts_info_list);
-
- skb_tx_timestamp(skb);
- }
-
- dma_wmb();
+ if (!rswitch_ext_desc_set(rdev, skb, desc, dma_addr, skb->len, DT_FSINGLE | DIE))
+ goto err_unmap;
- desc->desc.die_dt = DT_FSINGLE | DIE;
wmb(); /* gq->cur must be incremented after die_dt was set */
gq->cur = rswitch_next_queue_index(gq, true, 1);
