[PATCH v2] net/gve : Update EOP bit in txd rte_mbuf chain

[PATCH v2] net/gve : Update EOP bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

The EOP bit was not set for all the packets in mbuf chain
causing packet transmission stalls for packets split across
mbuf in chain.

Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
Cc: stable@dpdk.org

Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>
---
 drivers/net/gve/gve_tx_dqo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index a65e6aa..579b8d6 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -126,6 +126,7 @@
 			txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
 			txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 			txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
+			txd->pkt.end_of_packet = 0;
 
 			/* size of desc_ring and sw_ring could be different */
 			tx_id = (tx_id + 1) & mask;
-- 
1.8.3.1

[PATCH v3] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

The EOP and csum bit was not set for all the packets in mbuf chain
causing packet transmission stalls for packets split across
mbuf in chain.

Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
Cc: stable@dpdk.org

Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>
---
 drivers/net/gve/gve_tx_dqo.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index a65e6aa..91db037 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -89,6 +89,7 @@
 	uint16_t sw_id;
 	uint64_t bytes;
 	uint16_t first_sw_id;
+	uint8_t csum;
 
 	sw_ring = txq->sw_ring;
 	txr = txq->tx_ring;
@@ -114,6 +115,12 @@
 		ol_flags = tx_pkt->ol_flags;
 		nb_used = tx_pkt->nb_segs;
 		first_sw_id = sw_id;
+
+		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
+			csum = 1;
+		else
+			cusm = 0;
+
 		do {
 			if (sw_ring[sw_id] != NULL)
 				PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
@@ -126,6 +133,8 @@
 			txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
 			txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 			txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
+			txd->pkt.end_of_packet = 0;
+			txd->pkt.checksum_offload_enable = csum;
 
 			/* size of desc_ring and sw_ring could be different */
 			tx_id = (tx_id + 1) & mask;
@@ -138,9 +147,6 @@
 		/* fill the last descriptor with End of Packet (EOP) bit */
 		txd->pkt.end_of_packet = 1;
 
-		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
-			txd->pkt.checksum_offload_enable = 1;
-
 		txq->nb_free -= nb_used;
 		txq->nb_used += nb_used;
 	}
-- 
1.8.3.1

[PATCH v4] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

The EOP and csum bit was not set for all the packets in mbuf chain
causing packet transmission stalls for packets split across
mbuf in chain.

Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
Cc: stable@dpdk.org

Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>
---
 drivers/net/gve/gve_tx_dqo.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index a65e6aa..1374e1a 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -89,6 +89,7 @@
 	uint16_t sw_id;
 	uint64_t bytes;
 	uint16_t first_sw_id;
+	uint8_t csum;
 
 	sw_ring = txq->sw_ring;
 	txr = txq->tx_ring;
@@ -114,6 +115,12 @@
 		ol_flags = tx_pkt->ol_flags;
 		nb_used = tx_pkt->nb_segs;
 		first_sw_id = sw_id;
+
+		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
+			csum = 1;
+		else
+			csum = 0;
+
 		do {
 			if (sw_ring[sw_id] != NULL)
 				PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
@@ -126,6 +133,8 @@
 			txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
 			txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 			txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
+			txd->pkt.end_of_packet = 0;
+			txd->pkt.checksum_offload_enable = csum;
 
 			/* size of desc_ring and sw_ring could be different */
 			tx_id = (tx_id + 1) & mask;
@@ -138,9 +147,6 @@
 		/* fill the last descriptor with End of Packet (EOP) bit */
 		txd->pkt.end_of_packet = 1;
 
-		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
-			txd->pkt.checksum_offload_enable = 1;
-
 		txq->nb_free -= nb_used;
 		txq->nb_used += nb_used;
 	}
-- 
1.8.3.1

Re: [PATCH v3] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Stephen Hemminger]

On Thu,  1 Aug 2024 17:27:53 +0000
Tathagat Priyadarshi <tathagat.dpdk@gmail.com> wrote:

> +		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
> +			csum = 1;
> +		else
> +			cusm = 0;
> +

Obvious typo, did you do a final test build?

Could also use logical inverse operator instead of if() which will
generate better code sometimes.
		
		csum = !!(ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO);

Re: [PATCH v3] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

[-- Attachment #1: Type: text/plain, Size: 736 bytes --]

Thanks for your suggestion Stephen, I have already updated the patch with
v4 & fixed the typo. Will consider your suggestion in the next version of
the patch.


On Fri, 2 Aug 2024 at 00:24, Stephen Hemminger <stephen@networkplumber.org>
wrote:

> On Thu,  1 Aug 2024 17:27:53 +0000
> Tathagat Priyadarshi <tathagat.dpdk@gmail.com> wrote:
>
> > +             if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
> > +                     csum = 1;
> > +             else
> > +                     cusm = 0;
> > +
>
> Obvious typo, did you do a final test build?
>
> Could also use logical inverse operator instead of if() which will
> generate better code sometimes.
>
>                 csum = !!(ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO);
>
>

[-- Attachment #2: Type: text/html, Size: 1291 bytes --]

[PATCH v5] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

The EOP and csum bit was not set for all the packets in mbuf chain
causing packet transmission stalls for packets split across
mbuf in chain.

Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
Cc: stable@dpdk.org

Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>

Acked-by: Joshua Washington <joshwash@google.com>
---
 drivers/net/gve/gve_tx_dqo.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index a65e6aa..bbaf46d 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -89,6 +89,7 @@
 	uint16_t sw_id;
 	uint64_t bytes;
 	uint16_t first_sw_id;
+	uint8_t csum;
 
 	sw_ring = txq->sw_ring;
 	txr = txq->tx_ring;
@@ -114,6 +115,9 @@
 		ol_flags = tx_pkt->ol_flags;
 		nb_used = tx_pkt->nb_segs;
 		first_sw_id = sw_id;
+
+		csum = !!(ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO);
+
 		do {
 			if (sw_ring[sw_id] != NULL)
 				PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
@@ -126,6 +130,8 @@
 			txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
 			txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 			txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
+			txd->pkt.end_of_packet = 0;
+			txd->pkt.checksum_offload_enable = csum;
 
 			/* size of desc_ring and sw_ring could be different */
 			tx_id = (tx_id + 1) & mask;
@@ -138,9 +144,6 @@
 		/* fill the last descriptor with End of Packet (EOP) bit */
 		txd->pkt.end_of_packet = 1;
 
-		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
-			txd->pkt.checksum_offload_enable = 1;
-
 		txq->nb_free -= nb_used;
 		txq->nb_used += nb_used;
 	}
-- 
1.8.3.1

Re: [PATCH v5] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Tathagat Priyadarshi]

Updated the if-else block with an optimised inverse operator. Thanks
for your suggestion Stephen.

On Fri, Aug 2, 2024 at 10:36 AM Tathagat Priyadarshi
<tathagat.dpdk@gmail.com> wrote:
>
> The EOP and csum bit was not set for all the packets in mbuf chain
> causing packet transmission stalls for packets split across
> mbuf in chain.
>
> Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
> Cc: stable@dpdk.org
>
> Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
> Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>
>
> Acked-by: Joshua Washington <joshwash@google.com>
> ---
>  drivers/net/gve/gve_tx_dqo.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
> index a65e6aa..bbaf46d 100644
> --- a/drivers/net/gve/gve_tx_dqo.c
> +++ b/drivers/net/gve/gve_tx_dqo.c
> @@ -89,6 +89,7 @@
>         uint16_t sw_id;
>         uint64_t bytes;
>         uint16_t first_sw_id;
> +       uint8_t csum;
>
>         sw_ring = txq->sw_ring;
>         txr = txq->tx_ring;
> @@ -114,6 +115,9 @@
>                 ol_flags = tx_pkt->ol_flags;
>                 nb_used = tx_pkt->nb_segs;
>                 first_sw_id = sw_id;
> +
> +               csum = !!(ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO);
> +
>                 do {
>                         if (sw_ring[sw_id] != NULL)
>                                 PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
> @@ -126,6 +130,8 @@
>                         txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
>                         txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
>                         txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
> +                       txd->pkt.end_of_packet = 0;
> +                       txd->pkt.checksum_offload_enable = csum;
>
>                         /* size of desc_ring and sw_ring could be different */
>                         tx_id = (tx_id + 1) & mask;
> @@ -138,9 +144,6 @@
>                 /* fill the last descriptor with End of Packet (EOP) bit */
>                 txd->pkt.end_of_packet = 1;
>
> -               if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
> -                       txd->pkt.checksum_offload_enable = 1;
> -
>                 txq->nb_free -= nb_used;
>                 txq->nb_used += nb_used;
>         }
> --
> 1.8.3.1
>

Re: [PATCH v5] net/gve : Update EOP & csum bit in txd rte_mbuf chain

[Ferruh Yigit]

On 8/2/2024 6:08 AM, Tathagat Priyadarshi wrote:
> The EOP and csum bit was not set for all the packets in mbuf chain
> causing packet transmission stalls for packets split across
> mbuf in chain.
> 
> Fixes: 4022f99 ("net/gve: support basic Tx data path for DQO")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk@gmail.com>
> Signed-off-by: Varun Lakkur Ambaji Rao <varun.la@gmail.com>
> 
> Acked-by: Joshua Washington <joshwash@google.com>
>

Updated commit log slightly, please check the merged version.

Applied to dpdk-next-net/main, thanks.