hyperv/vmbus: Only make sure the TX bufring will not be closed.
KVP can write data, whose size is > 1/2 TX bufring size. MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7414
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@ -74,8 +74,12 @@ struct sysctl_oid;
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static __inline int
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vmbus_txbr_maxpktsz(const struct vmbus_txbr *tbr)
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{
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/* 1/2 data size */
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return (tbr->txbr_dsize / 2);
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/*
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* - 64 bits for the trailing start index (- sizeof(uint64_t)).
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* - The rindex and windex can't be same (- 1). See
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* the comment near vmbus_bufring.br_{r,w}index.
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*/
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return (tbr->txbr_dsize - sizeof(uint64_t) - 1);
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}
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void vmbus_br_sysctl_create(struct sysctl_ctx_list *ctx,
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