6.6-stable review patch. If anyone has any objections, please let me know.
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From: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com
[ 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@renesas.com Signed-off-by: David S. Miller davem@davemloft.net Stable-dep-of: 0c9547e6ccf4 ("net: renesas: rswitch: fix race window between tx start and complete") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/renesas/rswitch.c | 73 +++++++++++++++++--------- 1 file changed, 47 insertions(+), 26 deletions(-)
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);