qed: Add LL2 slowpath handling

For iWARP unaligned MPA flow, a slowpath event of flushing an
MPA connection that entered an unaligned state is required.
The flush ramrod is received on the ll2 queue, and a pre-registered
callback function is called to handle the flush event.

Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index 8eb9645c880d27822dd288ddeb45ab430d7eee49..047f556ca62e7da76045a9e27aea4115ee5d373c 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -422,6 +422,41 @@ static void qed_ll2_rxq_parse_reg(struct qed_hwfn *p_hwfn,
        data->u.placement_offset = p_cqe->rx_cqe_fp.placement_offset;
 }
 
+static int
+qed_ll2_handle_slowpath(struct qed_hwfn *p_hwfn,
+                       struct qed_ll2_info *p_ll2_conn,
+                       union core_rx_cqe_union *p_cqe,
+                       unsigned long *p_lock_flags)
+{
+       struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
+       struct core_rx_slow_path_cqe *sp_cqe;
+
+       sp_cqe = &p_cqe->rx_cqe_sp;
+       if (sp_cqe->ramrod_cmd_id != CORE_RAMROD_RX_QUEUE_FLUSH) {
+               DP_NOTICE(p_hwfn,
+                         "LL2 - unexpected Rx CQE slowpath ramrod_cmd_id:%d\n",
+                         sp_cqe->ramrod_cmd_id);
+               return -EINVAL;
+       }
+
+       if (!p_ll2_conn->cbs.slowpath_cb) {
+               DP_NOTICE(p_hwfn,
+                         "LL2 - received RX_QUEUE_FLUSH but no callback was provided\n");
+               return -EINVAL;
+       }
+
+       spin_unlock_irqrestore(&p_rx->lock, *p_lock_flags);
+
+       p_ll2_conn->cbs.slowpath_cb(p_ll2_conn->cbs.cookie,
+                                   p_ll2_conn->my_id,
+                                   le32_to_cpu(sp_cqe->opaque_data.data[0]),
+                                   le32_to_cpu(sp_cqe->opaque_data.data[1]));
+
+       spin_lock_irqsave(&p_rx->lock, *p_lock_flags);
+
+       return 0;
+}
+
 static int
 qed_ll2_rxq_handle_completion(struct qed_hwfn *p_hwfn,
                              struct qed_ll2_info *p_ll2_conn,
@@ -495,8 +530,8 @@ static int qed_ll2_rxq_completion(struct qed_hwfn *p_hwfn, void *cookie)
 
                switch (cqe->rx_cqe_sp.type) {
                case CORE_RX_CQE_TYPE_SLOW_PATH:
-                       DP_NOTICE(p_hwfn, "LL2 - unexpected Rx CQE slowpath\n");
-                       rc = -EINVAL;
+                       rc = qed_ll2_handle_slowpath(p_hwfn, p_ll2_conn,
+                                                    cqe, &flags);
                        break;
                case CORE_RX_CQE_TYPE_GSI_OFFLOAD:
                case CORE_RX_CQE_TYPE_REGULAR:
@@ -1214,6 +1249,7 @@ qed_ll2_set_cbs(struct qed_ll2_info *p_ll2_info, const struct qed_ll2_cbs *cbs)
        p_ll2_info->cbs.rx_release_cb = cbs->rx_release_cb;
        p_ll2_info->cbs.tx_comp_cb = cbs->tx_comp_cb;
        p_ll2_info->cbs.tx_release_cb = cbs->tx_release_cb;
+       p_ll2_info->cbs.slowpath_cb = cbs->slowpath_cb;
        p_ll2_info->cbs.cookie = cbs->cookie;
 
        return 0;

diff --git a/include/linux/qed/qed_ll2_if.h b/include/linux/qed/qed_ll2_if.h
index 95fdf02a3bbe43ea2d4e75d4d85ef9eabf011120..e755954d85fd1b6258a2048a30f13fea43ba722c 100644 (file)
--- a/include/linux/qed/qed_ll2_if.h
+++ b/include/linux/qed/qed_ll2_if.h
@@ -151,11 +151,16 @@ void (*qed_ll2_release_tx_packet_cb)(void *cxt,
                                     dma_addr_t first_frag_addr,
                                     bool b_last_fragment, bool b_last_packet);
 
+typedef
+void (*qed_ll2_slowpath_cb)(void *cxt, u8 connection_handle,
+                           u32 opaque_data_0, u32 opaque_data_1);
+
 struct qed_ll2_cbs {
        qed_ll2_complete_rx_packet_cb rx_comp_cb;
        qed_ll2_release_rx_packet_cb rx_release_cb;
        qed_ll2_complete_tx_packet_cb tx_comp_cb;
        qed_ll2_release_tx_packet_cb tx_release_cb;
+       qed_ll2_slowpath_cb slowpath_cb;
        void *cookie;
 };