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net: thunderbolt: Enable end-to-end flow control also in transmit

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According to USB4 specification, if E2E flow control is disabled for
the Transmit Descriptor Ring, the Host Interface Adapter Layer shall
not require any credits to be available before transmitting a Tunneled
Packet from this Transmit Descriptor Ring, so e2e flow control should
be enabled in both directions.

Acked-by: Mika Westerberg <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: zhangjianrong <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
zhangjianrong authored and Jakub Kicinski committed 2025-07-02 14:17:43 -07:00
1 parent 8ec31cb17c
commit a8065af334
1 file changed
+6 -7
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drivers/net/thunderbolt/main.c
+6 -7
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@@ -924,8 +924,12 @@ static int tbnet_open(struct net_device *dev)
netif_carrier_off(dev);
ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE,
RING_FLAG_FRAME);
flags = RING_FLAG_FRAME;
/* Only enable full E2E if the other end supports it too */
if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E)
flags |= RING_FLAG_E2E;
ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags);
if (!ring) {
netdev_err(dev, "failed to allocate Tx ring\n");
return -ENOMEM;
@@ -944,11 +948,6 @@ static int tbnet_open(struct net_device *dev)
sof_mask = BIT(TBIP_PDF_FRAME_START);
eof_mask = BIT(TBIP_PDF_FRAME_END);
flags = RING_FLAG_FRAME;
/* Only enable full E2E if the other end supports it too */
if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E)
flags |= RING_FLAG_E2E;
ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags,
net->tx_ring.ring->hop, sof_mask,
eof_mask, tbnet_start_poll, net);