From 11f23aa8ccd56786f0a6f04211cf59b3fab2ce08 Mon Sep 17 00:00:00 2001 From: Eddie Wai Date: Wed, 8 Jun 2011 19:29:34 +0000 Subject: [PATCH] cnic: Randomize initial TCP port for iSCSI connections This reduces the likelihood of port re-use when re-loading the driver. Signed-off-by: Eddie Wai Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/cnic.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c index ea7245c5fb69..a529bde03c56 100644 --- a/drivers/net/cnic.c +++ b/drivers/net/cnic.c @@ -605,11 +605,12 @@ static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type) } EXPORT_SYMBOL(cnic_unregister_driver); -static int cnic_init_id_tbl(struct cnic_id_tbl *id_tbl, u32 size, u32 start_id) +static int cnic_init_id_tbl(struct cnic_id_tbl *id_tbl, u32 size, u32 start_id, + u32 next) { id_tbl->start = start_id; id_tbl->max = size; - id_tbl->next = 0; + id_tbl->next = next; spin_lock_init(&id_tbl->lock); id_tbl->table = kzalloc(DIV_ROUND_UP(size, 32) * 4, GFP_KERNEL); if (!id_tbl->table) @@ -3804,14 +3805,17 @@ static void cnic_cm_free_mem(struct cnic_dev *dev) static int cnic_cm_alloc_mem(struct cnic_dev *dev) { struct cnic_local *cp = dev->cnic_priv; + u32 port_id; cp->csk_tbl = kzalloc(sizeof(struct cnic_sock) * MAX_CM_SK_TBL_SZ, GFP_KERNEL); if (!cp->csk_tbl) return -ENOMEM; + get_random_bytes(&port_id, sizeof(port_id)); + port_id %= CNIC_LOCAL_PORT_RANGE; if (cnic_init_id_tbl(&cp->csk_port_tbl, CNIC_LOCAL_PORT_RANGE, - CNIC_LOCAL_PORT_MIN)) { + CNIC_LOCAL_PORT_MIN, port_id)) { cnic_cm_free_mem(dev); return -ENOMEM; } @@ -4829,7 +4833,7 @@ static int cnic_start_bnx2x_hw(struct cnic_dev *dev) pfid = cp->pfid; ret = cnic_init_id_tbl(&cp->cid_tbl, MAX_ISCSI_TBL_SZ, - cp->iscsi_start_cid); + cp->iscsi_start_cid, 0); if (ret) return -ENOMEM; @@ -4837,7 +4841,7 @@ static int cnic_start_bnx2x_hw(struct cnic_dev *dev) if (BNX2X_CHIP_IS_E2(cp->chip_id)) { ret = cnic_init_id_tbl(&cp->fcoe_cid_tbl, BNX2X_FCOE_NUM_CONNECTIONS, - cp->fcoe_start_cid); + cp->fcoe_start_cid, 0); if (ret) return -ENOMEM; -- 2.20.1