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Date: Mon, 29 Jul 2013 00:55:27 -0700 (PDT) From: David Miller <davem@...emloft.net> To: amirv@...lanox.com Cc: netdev@...r.kernel.org, eugenia@...lanox.com Subject: Re: [PATCH net-next] net/mlx4_en: Fix BlueFlame race From: Amir Vadai <amirv@...lanox.com> Date: Thu, 25 Jul 2013 19:21:23 +0300 > From: Eugenia Emantayev <eugenia@...lanox.com> > > Fix a race between BlueFlame flow and stamping in post send flow. > Example: > SW: Build WQE 0 on the TX buffer, except the ownership bit > SW: Set ownership for WQE 0 on the TX buffer > SW: Ring doorbell for WQE 0 > SW: Build WQE 1 on the TX buffer, except the ownership bit > SW: Set ownership for WQE 1 on the TX buffer > HW: Read WQE 0 and then WQE 1, before doorbell was rung/BF was done for WQE 1 > HW: Produce CQEs for WQE 0 and WQE 1 > SW: Process the CQEs, and stamp WQE 0 and WQE 1 accordingly (on the TX buffer) > SW: Copy WQE 1 from the TX buffer to the BF register - ALREADY STAMPED! > HW: CQE error with index 0xFFFF - the BF WQE's control segment is STAMPED, > so the BF index is 0xFFFF. Error: Invalid Opcode. > As a result QP enters the error state and no traffic can be sent. > > Solution: > When stamping - do not stamp last completed wqe. > > > Signed-off-by: Eugenia Emantayev <eugenia@...lanox.com> > Signed-off-by: Amir Vadai <amirv@...lanox.com> Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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