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8981be9b2f
The skb truesize of a 12-byte payload with a 10-byte head/tail reserve is 768 bytes. Consequently, even with 40 tx_credits, at most 6 packets could be queued at any one time: 40 tx_credits * 127-byte mtu < 768-byte truesize * 7 This error could also cause the tx queue to apparently stall if credit flow control is disabled (where tx_credits is fixed at 5), or if the receiver only granted a limited number of tx credits (eg., less than 7). Instead, track the outstanding number of queued packets not yet sent in wmem_alloc and allow for a maximum of 40 queued packets. Report the space avail for a single write() as the mtu * number of packets left before reaching the maximum. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Tested-By: Alexander Holler <holler@ahsoftware.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> |
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