[DPDK/ethdev Bug 1779] Packet segments do not get freed in mprq_buf_to_pkt() upon encountering MLX5_RXQ_CODE_NOMBUF

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1779

            Bug ID: 1779
           Summary: Packet segments do not get freed in mprq_buf_to_pkt()
                    upon encountering MLX5_RXQ_CODE_NOMBUF
           Product: DPDK
           Version: 22.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: canary.overflow@gmail.com
  Target Milestone: ---

drivers/net/mlx5/mlx5_rx.h mprq_buf_to_pkt(...):

There are 2 issues: 

- uint32_t seg_len = RTE_MIN(len, (uint32_t)(pkt->buf_len -
RTE_PKTMBUF_HEADROOM)) seems unnecessary as to hit this code, len has to be
greater than (uint32_t)(pkt->buf_len - RTE_PKTMBUF_HEADROOM) due to the if
condition

- If the allocation struct rte_mbuf *next = rte_pktmbuf_alloc(rxq->mp) fails
and packet has more than 2 segs, the segs that were allocated previously do not
get freed 

    mprq_buf_to_pkt(...) {
        ...        
        } else if (rxq->strd_scatter_en) {
            struct rte_mbuf *prev = pkt;
            uint32_t seg_len = RTE_MIN(len, (uint32_t)
            (pkt->buf_len - RTE_PKTMBUF_HEADROOM));
            uint32_t rem_len = len - seg_len;

            rte_memcpy(rte_pktmbuf_mtod(pkt, void *), addr, seg_len);
            DATA_LEN(pkt) = seg_len;
            while (rem_len) {
                struct rte_mbuf *next = rte_pktmbuf_alloc(rxq->mp);

                if (unlikely(next == NULL))
                    return MLX5_RXQ_CODE_NOMBUF;
                ...
            }
            ...
        }
        ...
    }

Should rte_pktmbuf_free() be used instead?

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