From 26cdc443fd8fccccdfb17fd2845cf9233a995325 Mon Sep 17 00:00:00 2001 From: Anjali Singhai Jain Date: Fri, 10 Jul 2015 19:36:00 -0400 Subject: i40e: Fix legacy interrupt mode in the driver This patch fixes the driver flow to take into account legacy interrupts. Over time we added code that assumes MSIX is the only mode that the driver runs in. It also enables a legacy workaround to trigger SWINT when the TX ring has non-cache aligned descriptors pending and interrupts are disabled. We work with a single vector in MSI mode too, so apply the same restrictions as Legacy. Change-ID: I826ddff1f9bd45d2dbe11f56a3ddcef0dbf42563 Signed-off-by: Anjali Singhai Jain Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_main.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 07bfe61e5f71..481f427cedd9 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -1550,7 +1550,10 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi, * vectors available and so we need to lower the used * q count. */ - qcount = min_t(int, vsi->alloc_queue_pairs, pf->num_lan_msix); + if (pf->flags & I40E_FLAG_MSIX_ENABLED) + qcount = min_t(int, vsi->alloc_queue_pairs, pf->num_lan_msix); + else + qcount = vsi->alloc_queue_pairs; num_tc_qps = qcount / numtc; num_tc_qps = min_t(int, num_tc_qps, i40e_pf_get_max_q_per_tc(pf)); @@ -1614,7 +1617,7 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi, if ((vsi->type == I40E_VSI_MAIN) && (numtc == 1)) { if (vsi->req_queue_pairs > 0) vsi->num_queue_pairs = vsi->req_queue_pairs; - else + else if (pf->flags & I40E_FLAG_MSIX_ENABLED) vsi->num_queue_pairs = pf->num_lan_msix; } @@ -3416,7 +3419,7 @@ static irqreturn_t i40e_fdir_clean_ring(int irq, void *data) * @v_idx: vector index * @qp_idx: queue pair index **/ -static void map_vector_to_qp(struct i40e_vsi *vsi, int v_idx, int qp_idx) +static void i40e_map_vector_to_qp(struct i40e_vsi *vsi, int v_idx, int qp_idx) { struct i40e_q_vector *q_vector = vsi->q_vectors[v_idx]; struct i40e_ring *tx_ring = vsi->tx_rings[qp_idx]; @@ -3470,7 +3473,7 @@ static void i40e_vsi_map_rings_to_vectors(struct i40e_vsi *vsi) q_vector->tx.ring = NULL; while (num_ringpairs--) { - map_vector_to_qp(vsi, v_start, qp_idx); + i40e_map_vector_to_qp(vsi, v_start, qp_idx); qp_idx++; qp_remaining--; } @@ -8798,6 +8801,11 @@ static int i40e_vsi_setup_vectors(struct i40e_vsi *vsi) goto vector_setup_out; } + /* In Legacy mode, we do not have to get any other vector since we + * piggyback on the misc/ICR0 for queue interrupts. + */ + if (!(pf->flags & I40E_FLAG_MSIX_ENABLED)) + return ret; if (vsi->num_q_vectors) vsi->base_vector = i40e_get_lump(pf, pf->irq_pile, vsi->num_q_vectors, vsi->idx); -- cgit v1.2.3