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rxe: correctly calculate iCRC for unaligned payloads 

If RoCE PDUs being sent or received contain pad bytes, then the iCRC
is miscalculated, resulting in PDUs being emitted by RXE with an incorrect
iCRC, as well as ingress PDUs being dropped due to erroneously detecting
a bad iCRC in the PDU.  The fix is to include the pad bytes, if any,
in iCRC computations.

Note: This bug has caused broken on-the-wire compatibility with actual
hardware RoCE devices since the soft-RoCE driver was first put into the
mainstream kernel.  Fixing it will create an incompatibility with the
original soft-RoCE devices, but is necessary to be compatible with real
hardware devices.

Fixes: 8700e3e7c4 ("Soft RoCE driver")
Signed-off-by: Steve Wise <larrystevenwise@gmail.com>
Link: https://lore.kernel.org/r/20191203020319.15036-2-larrystevenwise@gmail.com
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Steve Wise 2019-12-02 20:03:20 -06:00 committed by Doug Ledford
parent 71bbac6e2f
commit 2030abddec
3 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/sw/rxe/rxe_recv.c
View File

@ -389,7 +389,7 @@ void rxe_rcv(struct sk_buff *skb)
calc_icrc = rxe_icrc_hdr(pkt, skb);
calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
payload_size(pkt));
payload_size(pkt) + bth_pad(pkt));
calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
if (unlikely(calc_icrc != pack_icrc)) {
if (skb->protocol == htons(ETH_P_IPV6))

6
drivers/infiniband/sw/rxe/rxe_req.c
View File

@ -500,6 +500,12 @@ static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
if (err)
return err;
}
if (bth_pad(pkt)) {
u8 *pad = payload_addr(pkt) + paylen;
memset(pad, 0, bth_pad(pkt));
crc = rxe_crc32(rxe, crc, pad, bth_pad(pkt));
}
}
p = payload_addr(pkt) + paylen + bth_pad(pkt);

7
drivers/infiniband/sw/rxe/rxe_resp.c
View File

@ -732,6 +732,13 @@ static enum resp_states read_reply(struct rxe_qp *qp,
if (err)
pr_err("Failed copying memory\n");
if (bth_pad(&ack_pkt)) {
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
u8 *pad = payload_addr(&ack_pkt) + payload;
memset(pad, 0, bth_pad(&ack_pkt));
icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
}
p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
*p = ~icrc;